MXPA98002243A

MXPA98002243A - Girato peristaltic pump

Info

Publication number: MXPA98002243A
Application number: MXPA/A/1998/002243A
Authority: MX
Inventors: A Juratovac Joseph; J Piontek Carl; S Osborne Robert; D Clegg Robert; L Buck Bradford; S Fleming Matthew; E Patton William; J Hoffman Dennis; R Wilson Grant
Original assignee: Abbott Laboratories
Priority date: 1995-09-21
Filing date: 1998-03-20
Publication date: 1998-11-12

Abstract

A rotating peristaltic pump has a pump housing with a front wall. The front wall of the pump housing has a lower part and an upper part projecting forward on the lower part. An impulse arrow for a motor extends through an opening in the lower part of the front wall of the body, and has a peristaltic rotor mounted thereon. There are two retention receptacles in the wall of the body for receiving a fluid transfer apparatus, and one of the retention receptacles communicates with a guide, for a feeding apparatus, which extends horizontally towards a lateral side of the housing of the bom

Description

ROTARY PERISTAL BOMB FIELD OF THE INVENTION The present invention relates to a rotary peristaltic pump used to introduce an enteral fluid or a parenteral fluid into the body of a patient.

- BACKGROUND OF THE INVENTION The present invention is a rotary peristaltic pump that can be assembled with a fluid transfer apparatus for use in almost any occasion where a patient's oral or parenteral fluids are to be transferred through a flexible tubing. Parenteral fluids are transferred to the circulatory system of a patient. The enteric fluids are transferred to the patient's gastrointestinal tract. Revolving peristaltic pumps are well known, and are described in number of Patents of the United States of North America, such as, 5,250,027; 5,057,081; 4,913,703; 4,884,013; 4,832,584; 4,722,734; 4,720,636; 4,708,604; 4,690,673; 4,688,595; 4,545,783; and 4,513,796. Rotary peristaltic pumps commonly include a motor-driven peristaltic rotor mounted on an arrow that extends outwardly through the front wall of the pump housing. The peristaltic rotor carries an arrangement of two or more rollers circumferentially, that is, angularly separated. The peristaltic rotor is designed to have a portion of the flexible tubing of the feeding apparatus wrapped part of the way around the array of rollers under tension against them, or confined between the rollers and an opposite arcuate surface. When the motor inside the pump housing rotates the arrow on which the peristaltic rotor is mounted, the separated rollers are brought into contact in sequence with the flexible tubing with each revolution of the motor shaft, and in turn, each roller compresses a portion of the pipe to form an occlusion. The occlusion is advanced along the pipeline, as the peristaltic rotor rotates, and the roller advances along the pipeline, the occlusion disappearing where the pipe diverges tingencialmente from the rotor. There is a predetermined amount of fluid contained between successive occlusions, such that a predetermined volume of fluid is advanced in a peristaltic manner through the pipe with each revolution of the rotor. In accordance with the above, the amount of fluid to be transferred to the patient can be regulated by controlling the rotation speed of the peristaltic rotor and the time duration of the fluid transfer procedure. Fluid transfer apparatuses, also referred to herein as feeder apparatuses, typically comprise a drip chamber having an outlet end connected with an elastically flexible pipe, such as a silicone rubber tube, or interconnected sections thereof. , which in turn are connected, directly or through an adapter, with the required device, such as a needle or tube, for parenteral or enteral administration of fluid to the patient. The inlet of the drip chamber is adapted to receive, either directly or through a flexible tubing connection piece, enteral or parenteral fluid from a supply container thereof, typically a hanging vessel. A portion of the flexible tubing is appropriately associated with a pump if it is to be used. For example, if the pump is a rotating peristaltic pump, the flexible tubing is usually partially wrapped, i.e., less than one complete revolution, around the rotor, as described above. The fluid transfer apparatus is typically changed every day. It is important that the fluid transfer apparatus is manufactured in accordance with very rigid manufacturing specifications, so that the transfer volumes are accurately determined in advance and are controlled and produced in a consistent manner from apparatus to apparatus. The portion of the flexible pipe, which, together with the drip chamber, forms the fluid transfer apparatus, that is, the feeding apparatus, to be mounted on the pump, for example, it must be cut to a consistent length for each apparatus, and it must have a camera of constant and consistent internal diameter, and a consistent flexibility and elasticity, as determined by durometer tests, in such a way that the internal diameter of the chamber is consistent for each fluid transfer apparatus when placed in tension around the rotor of the peristaltic pump. The dimensions of the drip chamber should also be consistent, especially at the length, such that the drip chamber can be properly aligned with an adjacent drip sensor on the pump housing, if said sensor is used. The portion of each fluid transfer apparatus that is typically assembled with a rotating peristaltic pump housing is placed in an operative position by inserting the drip chamber into a recess or complementary retention pocket formed in the housing, tangentially toward up from a circumferential edge of the rotor. The flexible tubing extending from the bottom of the drip chamber is stretched sufficiently around the peristaltic rotor roller array, to provide the peristaltic action of the rollers, and back up along another channel or groove formed in the pump housing, and leading tangentially upwards from a circumferential edge of the rotor, to a support element such as a recess or retention pocket formed in the pump housing. Typically, the flexible tubing will have formed thereon, or attached thereto, a collar or flange that engages an upper surface of the portion of the pump housing that defines the recess or retention pocket. The collar or flange is located along the flexible tubing in a linear position that will require that the flexible tubing be in tension in order to place the collar in the recess of retention. In most known devices of the type generally described above, the flexible tubing is most commonly positioned to extend outwardly above the pump housing in an almost vertical direction, and arched over and away from the pump housing, toward the patient which is being fed or treated, or the flexible pipe is placed in an arcuate groove formed in the housing of the pump leading upwards, as well as laterally away from the recess of retention, to the edge of the housing, from which point arches the flexible tubing on and away from the pump housing towards the patient. The arched groove is of a large enough radius, such as 2.54 centimeters, to not wrinkle or curl the flexible pipe and reduce the cross section of the flexible pipe chamber, so as to significantly limit the flow of liquid through the pipe. Of the same. Examples of the configuration with the transfer path of the fluid extending upwardly over the pump housing are shown in U.S. Patent Nos. 5,380,173; 5,250,027; 5,147,312; 5,133,650; 5,057,081; 4,913,703; 4,836,752; 4,832,584; 4,688,595; 4,552,516; 5,515,535; 4,513,796; and 4,231,725. An example of the configuration with fluid transfer through the pipe, extending upwardly from the peristaltic rotor and outwardly laterally along an arcuate groove in the housing, is shown in the United States of America Patent Number 4, 884, 013. In yet other configurations, the flexible tubing that receives fluid from the drip chamber outlet describes an arcuate fold of approximately 180 ° which engages the curvature of the peristaltic rotor, and extends horizontally toward and from the rotor around which it is to be wrapped up to a large degree, and is stopped under tension by the retaining element on the pump housing, or by compression of the rotor, as illustrated in the US Pat. North American Numbers 5,082,429; 4,886,431; 4,813,855; 4,722,734 and 4,545,783. In still another configuration, the flexible pipe leading from the drip chamber or other supply element is brought up from below the peristaltic rotor of the peristaltic pump, and on the rotor and back down, to then extend laterally towards the patient. This configuration is illustrated in the Patents of the United States of North America Nos. 5,266,013; 5,110,270; 4,720,636; 4,708,604; 4,256,442 and 3,963,023. With some of these designs or configurations, it is possible that the movement of a pole supporting a hanging container or other supply support, or indeed the movement of the supply container, by itself, causes the flexible tubing to become loose or uncoupling from the peristaltic rotor, or an uneasy patient can accidentally pull and move the flexible tubing from the recess or retention pocket on the downstream side of the peristaltic rotor, resulting in the decoupling of the compression tubing by the peristaltic rotor. In these situations, it is possible to have an uncontrolled flow velocity induced by gravity of the enteral or parenteral fluid towards the patient, because the rotor rollers are not compressing properly, ie, occluding, the flexible tubing, to restrict the flow of blood. fluid through the feeding apparatus at a previously selected speed.

SUMMARY OF THE INVENTION In accordance with the present invention, there is provided a rotating peristaltic pump comprising a housing having: a front body wall with an upper part and a lower part, and projecting the upper part forwardly on the lower part; an opening in the lower part of the front body wall, for receiving an engine arrow therethrough, below the upper part protruding from the front body wall; first and second holding receptacles for receiving the retention elements of a cooperative feeding apparatus formed in the upper part of the front body wall, above the opening; and a horizontal guide formed in the upper part of the front body wall, which connects to, and extends from, the second retention receptacle, to a lateral side of the pump housing. The special characteristics of the pump housing inhibit the unintentional separation of a fluid transfer apparatus from the pump housing, without sacrificing the convenience in mounting and disassembling the fluid transfer apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a front elevational view of a peristaltic pump assembly and fluid transfer apparatus according to the invention, connected to the inlet end of the fluid transfer apparatus with a supply container of a liquid enteral nutrient product, here suspended from a support on a pole, and, connected at the discharge end of the fluid transfer apparatus with a feeding tube that extends into the stomach of a patient, whose abdomen is shown in a fragmentary view, partially separated in parts and in section. Figure 2 is a perspective view of a peristaltic pump assembly and fluid transfer apparatus in accordance with the invention. Figure 3 is a perspective view of the peristaltic pump of Figure 2, without the complementary fluid transfer apparatus assembled therewith. Figure 3A is a highly amplified view of the enclosed portion in a circle of Figure 3. Figure 4 is a front elevational view of the peristaltic pump assembly and fluid transfer apparatus of Figure 2. Figure 4A is a fragmentary sectional view taken along line 4A-4A of Figure 4.

Figure 5 is a side view of the peristaltic pump assembly and fluid transfer apparatus of Figure 4. Figure 6 is a top view of the peristaltic pump assembly and fluid transfer apparatus of the Figure 4, while inside the portion enclosed in a circle, the first retaining element in the form of a lid or in the form of a collar is partially separated into parts for purposes of illustrating the relationship of the retaining element and one of the floor protuberances. of the first recess of retention.

Figure 6A is an enlarged view of the enclosed portion in a circle of Figure 6, with the retention element shown only in dotted delineation for purposes of illustration, so as to better understand the nature of the floor of the first recess of retention , and the downward connection extending through the guide. Figure 7 is an enlarged fragmentary view in vertical section of the peristaltic pump assembly and fluid transfer apparatus of Figure 4, taken along line 7-7 of Figure 4. Figure 8 is a fragmentary view, in horizontal section, of the peristaltic pump assembly and fluid transfer apparatus of Figure 4, taken along line 8-8 of Figure 4. Figure 8A is an additional amplified fragmentary view in vertical section of the assembly. of peristaltic pump and fluid transfer apparatus of Figure 4, taken along line 8A-8A of Figure 8. Figure 9 is a perspective view of a fluid transfer apparatus according to the invention, with the first and third portions of flexible tubing truncated and shortened. Figure 10 is a front view of the fluid transfer apparatus of Figure 9. Figure 10A is a sectional view taken along line 10A-10A of Figure 10. Figure 11 is a perspective view of a section of the flexible pipe of a fluid transfer apparatus of the invention, such as the second section 49, with a novel tightening valve element that comes out in a telescope thereon, which tightens the pipe in a valve action when the pipe is not under tension. Figure 12 is an enlarged perspective view of the clamping valve element of Figure 11, before being mounted telescopically on the flexible tubing, to provide the valve action. Figure 13 is a side elevational view of the components of a clamping valve. Figure 14 is a side view of a flexible pipe section that has been tightened by the novel tightening valve element of Figure 12. Figure 15 is a perspective view of a fluid transfer apparatus as shown in FIG. Figure 9, but having a telescoping valve element on the flexible pipe near the second retaining element. Figure 16 is a front view of the fluid transfer apparatus of Figure 15. Figure 17 is a view, partly in front elevation and partially fragmentary and in section, of the peristaltic pump assembly and fluid transfer apparatus of the invention. , which can be connected at the inlet end with the screw cap opening of a hanging supply container of a liquid enteral nutrient product, and which is connected at the outlet end with a nasogastric feeding tube extending inwardly. of a patient's stomach. Figure 18 is a view, partially in front elevation and partially fragmentary and section, of the peristaltic pump assembly and fluid transfer apparatus of the invention, which can be connected at the inlet end with a pierceable lid of a supply container pendant of a liquid enteral nutritious product, and which is connected at the outlet end with a feeding tube that leads to the jejunum of a patient.

Figure 19 is a view, partly in front elevation and partially fragmentary and in section, similar to Figure 18, but with the outlet end of the fluid transfer apparatus connected with a feeding tube extending through a stoma in the abdominal wall, and into the patient's stomach. Figure 20 is a view, partially in front elevation and partially fragmentary, of a peristaltic pump assembly and fluid transfer apparatus of the invention, the inlet end of the first section of flexible tubing being connected to a hanging supply container of a parenteral fluid, and the outlet of the third section of flexible tubing connecting with a needle extending into a vein of a patient's arm. Figure 21 is a perspective view of a peristaltic pump in accordance with the prior art. Figure 22 is a partially fragmentary perspective view of a pendant delivery container of an enteral or parenteral fluid shown connected to the inlet end of a peristaltic pump and fluid transfer apparatus assembly in accordance with the prior art, the assembled fluid transfer apparatus with the prior art peristaltic pump of Figure 21. Figure 23 is a perspective view of a preferred form of right angle retention / connector element suitable for connecting the second and third segments of the Flexible tubing of the fluid transfer apparatus of the invention. Figure 24 is a top view of the retainer / connector element of Figure 23. Figure 25 is a vertical sectional view of the retention / connector element of Figure 23, taken along line 25-25 of the Figure 24. Figure 26 is a side view of the retention element / connector of Figure 23. Figure 27 is a front view of the retention element / connector of Figure 23. Figure 28 is a bottom view of the retention element. / connector of Figure 23, viewed in the direction indicated by arrow 28 in Figure 27. Figures 29 to 34 show alternative embodiments of retention / connector elements at right angles to different forms of retention tabs, with the exception of retaining element / connector of Figure 29 which only has a retention tab. Figures 35 to 38 are perspective views of further alternative embodiments of retention / connector elements with retention tabs of different shapes, and which do not have a right angle formed in the channel inside the retention element / connector. Figure 39 is a perspective view of yet another alternative embodiment of the retention element / connector, which provides a passage at a right angle therethrough, but which supports the third section of flexible tubing forward of the pump housing. Figure 40 is a fragmentary view for the most part in vertical section, taken through the front wall of the pump housing adjacent to the pump rotor, showing the retainer / connector element of Figure 39 assembled with a pump peristaltic of the invention. Figure 41 is a fragmentary portion of the more amplified Figure 40, to more clearly show the tabs of the recess, as well as the retention element / connector. Figures 42 and 43 are perspective views similar to Figures 11 and 12, respectively, of an alternative clamping valve member assembled with a length of flexible tubing, and of the clamping valve member itself. Figures 44 and 45 are perspective views similar to Figures 11 and 12, respectively, of an alternative clamping valve member assembled with a length of flexible tubing, and of the clamping valve member itself. Figures 46 and 47 are perspective views similar to Figures 11 and 12, respectively, of an alternative clamping valve member assembled with a length of flexible tubing, and of the valve element tightening by itself. Figure 47A is a rear view of the tightening valve element of Figure 47. Figures 48 and 49 are perspective views similar to Figures 11 and 12, respectively, of an alternative tightening valve element assembled with a length of flexible tubing, and the valve element tightening by itself. Figure 50 is a perspective view of a section of flexible tubing partially assembled with an alternative clamping valve element. Figure 51 is a perspective view of the tightening valve of Figure 50 completely assembled, the flexible pipe not being under tension. Figure 52 is a perspective view of the flexible tubing and the clamping valve of Figure 51, with the tubing under sufficient tension to open the clamping valve. Figure 53 is a front elevation view of yet another alternate tightening valve element. Figure 54 is a side elevational view of an assembly of the clamping valve member of Figure 53, and a length of flexible tubing, the tubing being in a relaxed state. Figure 55 is a side elevational view of the assembly of Figure 54, with the flexible pipe under sufficient tension to open the clamping valve. Figures 56 and 57 are views in longitudinal and transverse section, respectively, of another form of tension-responsive clamping valve, wherein a spring wire bent into the wall of a section of the flexible pipe is embedded. Figure 57A is a cross-sectional view of another form of tension-responsive clamping valve, similar in action mode to that of the clamping valve of Figures 56 and 57, but wherein the bent spring wire is bonded or adhesively bonded longitudinally to the exterior of the wall of a flexible pipe section. Figure 58 is a fragmentary side view of an assembly of yet another form of tightening valve element, with a length of flexible tubing, the assembly of which is a valve responsive to tension. Figure 59 is a perspective view of the front and side of an assembly apparatus that has been used to assemble a clamping valve member with a length of pipe. Figure 60 is a perspective view of the back and side of the assembly apparatus of Figure 59. Figure 61 is a front elevational view of the assembly apparatus of Figure 59. Figure 62 is a highly amplified fragmentary view. of the portion of Figure 61 enclosed in a circle by a dotted line. Figure 63 is a vertical sectional view of the assembly apparatus, taken along line 63-63 of Figure 61. Figure 64 is a perspective view separated into parts of the components of the assembly apparatus, with a corner of the separate base plate for illustration purposes. Figure 65 is a highly amplified perspective view of an ejector block that can be used as part of a subassembly identified by reference character 330 in Figure 64. Figure 66 is a highly amplified perspective view of another block ejector that can be used in a modification of the sub-assembly identified by the reference character 330 of Figure 64. Figure 67 is an amplified perspective view, separated in parts, of some of the components of the subassembly identified by the character of reference 330 in Figure 64, which includes the ejector block of Figure 65.

Figure 68 is an enlarged perspective view separated into parts of all components of the subassembly identified by the reference character 330 in Figure 64 with the components shown in Figure 67 already assembled together. Figure 69 is a highly magnified perspective view of an "L" shaped extensor finger element, showing the guide pin extending laterally from the leg portion. Figure 70 is a highly amplified perspective view, partially separated in parts, of the subassembly identified by the reference character 330 in Figure 64, in the assembly process. Figure 71 is a highly magnified perspective view of the subassembly identified by the reference character 330 in Figure 64. Figure 72 is a perspective view of the inverse or internal face of the cover plate. Figure 73 is a perspective view of the assembly apparatus with the components of a tightening valve shown in a separate view in parts about to be assembled, using the assembly apparatus. Figure 74 is a fragmentary perspective view of the assembly apparatus shown, with a first tubular segment end portion of the pressure valve member oriented to be positioned on, ie, around, the fingers of the finger-expander elements. Figure 75 is a view similar to Figure 74, with the first tubular segment end portion of the tightening valve element slid over the group of extenders, to begin the assembly process. Figure 76 is a vertical sectional view of the assembly apparatus as shown in Figure 63, but with a first tubular segment, i.e., a tubular end portion of the tightening valve element, positioned on the extension fingers as in FIG. Figure 75. Figure 77 is a fragmentary perspective view similar to Figure 75, showing the first tubular segment end portion of the tightening valve element shown in Figure 75, stretched open radially to receive through the The section of pipe on which the tightening valve element is to be telescopically assembled. Figure 78 is a fragmentary sectional view of the assembly apparatus and the first stretched tubular segment end portion of the tightening valve member shown in Figure 77, and with the length of pipe inserted into the apparatus on the dipstick. central guide and through the group of extensor fingers. Figure 79 is a front elevation of the portion of the assembly apparatus encompassed by the cover plate at the point of the assembly process illustrated in Figures 77 and 78. Figure 80 is a fragmentary sectional view of the assembly apparatus, with the tubular segment end portion of the clamping valve relaxed over the pipe section, and with the ejector piston moved forward. Figure 81 is a front elevation of the portion of the assembly apparatus encompassed by the cover plate at the point of the assembly process illustrated in Figure 80. Figure 82 is a fragmentary perspective view of the assembly apparatus closely similar to that of Figure 74, but adapted with a longer ejector block for the next stage of assembly of a clamping valve assembly with the second tubular end portion of the clamping valve member oriented to be placed on, ie, around, the fingers, and with the front end of the pipe section bent to the side. Figure 83 is a view similar to Figure 82, showing an additional step in the next step of manufacturing a clamping valve assembly, wherein the second tubular end portion is being placed over the pipe section. Figure 84 is a fragmentary sectional view of the assembly apparatus and the second stretched tubular segment end portion of the tightening valve element shown in Figure 83, and with the length of pipe inserted in the apparatus on the dipstick. central guide and through the group of extensor fingers. Figure 85 is a fragmentary sectional view of the assembly apparatus, with the second tubular segment end portion of the clamping valve relaxed over the pipe section, and the ejector piston moved forward.

DETAILED DESCRIPTION OF THE INVENTION As used herein and in the claims, descriptive terms such as top, bottom, top, bottom, top, bottom, and the like, are understood to refer to a rotating peristaltic pump when the arrow on the which the peristaltic rotor of the pump is mounted, is oriented in a substantially horizontal position. Referring now to the drawings, in which like parts are referenced by like reference numerals, and in particular to Figure 1, there is shown a rotating peristaltic pump of the present invention, indicated generally by numeral 40, assembled with apparatus of fluid transfer, indicated generally by the numeral 42. The rotating peristaltic pump 40 is conveniently shown mounted on a conventional support post 90, as well as a supply container 91 of an enteral nutritive product. In the top view of Figure 6, a suitable post clamp 92 fixed to the back of the pump housing 41 is best seen. The assembly of the peristaltic pump and the fluid transfer apparatus is shown amplified in the Figures. 2, 4, 4A, 5, 6, and 6A. The peristaltic pump is shown separately in Figures 3 and 3A. The fluid transfer apparatus is shown separately in Figures 9-10 and 15-16.

The fluid transfer apparatus 42 provides a continuous fluid path from the enteral or parenteral fluid supply container 91 to the tube or needle or other device that directs the fluid into the patient's body. Although in this first embodiment a first end of the fluid transfer apparatus is integral with a supply container, in the alternative embodiments described herein, a first end of the fluid transfer apparatus may be connected to a supply container. , and it is understood that any alternative may be employed in the practice of the invention described and claimed herein. For example, as shown in Figure 17, a first end of the fluid transfer apparatus can be connected to a supply container 101 using a threaded closure 95, or as shown in Figures 18 and 19, a first end of the The fluid transfer apparatus can be connected to a supply container 104, 105, by penetrating a membrane in the container or in its closure with a shank or cannula 103. The fluid transfer apparatus 42 is formed of a drip chamber 43 which shown in Figures 1 and 4 partially concealed in a first recess 44 formed in the junction of the front wall 45 and the upper wall 46 of the housing 41 of the pump. The drip chamber 43 is connected at its inlet with a first section 39 of flexible tubing, shown shortened. Preferably, the first and third lengths of flexible tubing 39, 64 are made of polyvinyl chloride (PVC), and the second section of tubing 49 is made of an elastically flexible silicone rubber. The first section 39 of flexible tubing can be connected to, or integral with, the outlet of a supply container, and optionally can have a second drip chamber (not shown), and / or a conventional slide clamp 97 assembled with the same. The outlet of the drip chamber 43 is connected to the first end 48 of the second section 49 of flexible tubing. The drip chamber 43 is also provided with a first retaining element in the form of a collar or flange 47 snapped, or adhesively bonded thereto, preferably at the upper end 43a thereof, as best seen in FIG. Figure 4A. The first section 39 of flexible tubing is attached to the retaining element 47 in a telescoping interference fit relationship. The first retention element 47, also referred to herein as a drip chamber retention element, shown here, is rectangular and almost square in its external form, and adjusts in the first recess retention 44 of the pump housing. If desired, the retention element 47 of the drip chamber can be made with a different geometric shape, such as a triangular or oval or trapezoidal shape, provided the recess of retention in the pump housing is configured in a complementary manner to receive and retain the retention element of the drip chamber. The pump housing 41 is preferably molded from a polymer or impact-resistant polymer mixture, such as an ABS (acrylate-butadiene-styrene) mixture, or a mixture of ABS-polycarbonate. Extending from the bottom or floor 44a of the first recess recess 44 of the pump housing, there is a substantially vertical guide 50 formed in the front wall 45 of the pump housing. As can be seen in the side view of Figure 5, the upper part of the front wall 45 of the pump housing protrudes forward over the lower part, providing a vertical alignment of the drip chamber 43, and the second section 49 of flexible tubing depending thereon, with the peristaltic rotor 52 of the pump placed below the drip chamber 43. As seen in Figure 4, the guide 50 directs the drip chamber 43 downwardly from the first recess of retention 44 until the connection of the outlet 51 of the drip chamber 43 with the first end 48 of the second section 49 of flexible pipe. Referring to Figure 3, a preferred form of configuration of the housing 41 of the peristaltic pump 40 is shown, where it is seen that the first recess 44 has a substantially flat floor 44a that surrounds the opening toward the guide 50. Two small erect protuberances 71 extend upward at the left and right rear corners (not shown) of the floor 44a. The first retention element 47, which supports the drip chamber, is preferably made as an inverted hollow box that opens downwards, as can be seen in Figure 10A, a sectional view taken along the line 10A-10A of Figure 10, looking up, inside the open side of the "box". When Figure 10A is seen in conjunction with Figure 4A, a cross section of the first retention element 47 is shown, it is seen that this form of retention element has an upper rectangular wall 72 with dependent side walls 73 surrounding an inlet tubular centrally located section 74, extending through the upper wall 72, providing the external connection with the first section 39 of flexible tubing, which can be connected to, which is integral with, a supply container. Circling concentrically to the tubular inlet 74 which extends slightly through the upper wall 72, and which is surrounded by the side walls 73, there is a shortened cylindrical sleeve portion 75 integrally formed with the upper wall 72. The cylindrical sleeve portion 75 serves as a support for the drip chamber 43, whose upper end 43a, as indicated in Figure 4A, is passed as a telescope over the cylindrical sleeve portion 75, and snaps or adheres thereto. In addition, it is preferred that a small tab-shaped tab 77 be provided on the front side of the side wall 73 at its bottom edge. It is found that this tab-shaped tab is easily held between the thumb and forefinger, providing a convenient placement or removal of the first retention element 47 and the attached drip chamber 43 and the second section 49 of flexible tubing, when mounted or the feed apparatus 42 is removed from the housing 41 of the pump. The rotor 52 of the peristaltic pump, as best seen in Figures 3 and 5, is conventional, having a plurality of rollers 53, for example, from 2 to 4, with 3 being a practical number, extending parallel to the axis of rotation of the rotor between the opposing disc-shaped end face members 57, and are arranged equiangularly along a circumferential line about the axis of rotation of the rotor. Preferably, the rollers 53 can each be rotated on an axial rod or bolt (not shown) that extends between the end face members 57. If desired, the rollers 53 can be fixed and non-rotating, but if they are fixed, it will require more energy to rotate the rotor against the second section 49 of flexible tubing stopped against them under a voltage sufficient to provide the peristaltic pumping action, and greater wear of the fixed rollers can be expected. The end face members 57 are supported axially on an arrow which is driven by a pump motor (neither the arrow nor the pump motor are shown), the pump motor being mounted inside the pump housing 41, and the arrow extending forward through the front wall of the pump housing, to support and rotate the peristaltic rotor 52. The pump motor is supplied with electrical power through a conventional electrical appliance cable 93. It is provided. a control knob 94 for selecting the rate of fluid transfer on the front of the pump housing. Referring now to Figures 4, 9, and 10, the second section 49 of flexible tubing is wrapped around and against the peristaltic rotor 52, and stops under tension against the rollers 53 of the rotor 52, when the second section 49 of tubing flexible is carried back up, on the other side of the rotor, to a connection of the second end 60 of the second section 49 of flexible tubing with a first leg 61 of a second retaining element 56, hereinafter referred to as an element of Retention / connector. The retention element / connector 56 is retained in the second recess 55 of the pump housing when the peristaltic pump and the fluid transfer apparatus are assembled together. The second leg 62 of the retention element / connector 56 is connected to the first end 63 of a third section 64 of flexible tubing. The connection of the respective ends of the second section 49 of flexible pipe with the retaining element / connector 56, and with the outlet of the drip chamber 43, is done by placing the pipe ends, on the one hand, and the retaining element / connector or the drip chamber outlet, on the other hand, in a male / female or telescopic relationship, or in an interference fit, and if desired, using adhesives, solder, etc., to ensure the union well done. The retaining element / connector 56 is stopped in a retentive but replaceable manner, in the second recess of retention, or receptacle, 55, which is formed in the projecting upper part of the front wall 45 of the housing 41 of the pump, and it is aligned in a substantially vertical manner with the side of the peristaltic rotor 52 opposite the side aligned with the drip chamber 43. As best seen in Figure 3A, a notch or slot 58, which extends through the floor 59 of the recess of retention 55, and opening towards the front of the wall of the housing 45, supports the first vertical leg 61 of the retaining element / connector 56. In a preferred form shown in greater detail in Figures 23 to 28, the element retention / connector 56 is preferably molded into a substantially hollow tubular shape, and continuous fluid path 54, as it extends therethrough, forms a fold of approximately a right angle, at of the retaining element / connector 56 has first and second legs 61 and 62, which meet approximately at a right angle. The fluid path 54 through the retainer / connector element 56 preferably has approximately the same cross-sectional area through it as the chamber of the flexible tubing sections connected thereto., such that substantially there is no constriction of fluid flow around the bend at right angles. The bend, in the preferred retainer / connector element, has a radius, at the location indicated by "R" in Figure 25, less than about 0.9525 centimeters (0.375 inches), preferably less than about 0.635 centimeters (0.25 inches). , in order to fit in a retentive manner in recess 55. The comparative test has indicated that the retainer / connector element of the fluid transfer apparatus disclosed herein is most surely attached to the given rotating peristaltic pump to be known herein, that the similar peristaltic pump / retention device of the prior art shown in Figures 21 and 22. In order to have a good retention of the retention element / connector 56 in the second recess of retention or receptacle 55, in such a way that the accidental or total removal of the fluid transfer apparatus 42 from the housing 41 of the bomb is difficult, and therefore unlikely. a, the recess of retention 55 having an opening with a vertical height, represented by the dimension "X" in Figure 5, of approximately 1.12 centimeters (0.44 inches), the angle of the bend, represented by the angle "_" in the Figure 27, in the retention element / connector 56, can vary from a right angle by no more than about plus or minus 11.8 degrees, or a maximum of variation of about 12 degrees. Accordingly, the angle "_" of the fold can vary from about 78 to about 102 degrees, but preferably from about 85 to about 95 degrees for ease of insertion and removal of the retainer / connector 56, and also for a good interlocking thereof with the recess retention 55. The comparative test has indicated that the retention element / connector 56 of the fluid transfer apparatus disclosed herein, more surely joins the rotary peristaltic pump disclosed in present, than the similar rotary peristaltic pump / retention device of the prior art shown in Figures 21 and 22. A highly preferred feature of the retention element / connector 56, is a shortened retention tab 65 extending laterally from the retainer / connector 56 approximately at the level of the right angle bend, and in a direction op The second tab, ie horizontal, 62 is provided. As best seen in Figures 8 and 8A, the retaining tab 65 serves to assist in retaining the retention element / connector 56 in the second retaining recess 55 of the housing. the pump and also helps to support the retaining element / connector 56 on the floor 59 of the second recess recess, and to prevent it from sliding downward through the notch or groove 58 of the floor 59. Preferably, the retention element connector 56 is also provided with a forwardly extending handle or tab 66 for holding, which is conveniently held between the thumb and forefinger when the retention element / connector 56 is inserted into, or removed from, the second recess retention 55. The handle or tab 66 for clamping is also located approximately at the level of the right angle bend of the retention element / connector 56, and extends approximately at a right angle with each of the first and second legs 61, 62, and with the retaining tab 65. In Figures 23 to 28, the retention element / connector 56 is shown, the first part 61 having a smaller external diameter on which it can be placed. in telescope the second end 60 of the second section 49 of flexible tubing to connect the two, as shown in Figures 9, 10, 15, and 16, and the second leg 62 is shown with a larger internal diameter inside of which the first end 63 of the third section 64 of the flexible pipe could be telescoped to make the connection between them. This is merely a matter of choice, and any connection can be made to the flexible tubing that is the internal or external member of the connection. In Figs. 29 to 34 alternate embodiments 56a-56f of retaining / connecting elements are shown, which can be used in the practice of the present invention, and which incorporate a right angle bend inside the retention element / connector, with different shapes and sizes and orientations of the tabs 66b-66f for holding the retention element / connector, corresponding to the tab 66, or in its absence, as shown in the embodiment 56a of Figure 29, and with a variation in the shape of the retaining tab 65a of Figure 29 which corresponds to the retaining tab 65. It is understood that the retention tab can take a wide variety of forms, provided that a complementary cavity is provided in the pump housing with characteristics of retention that facilitate a quick insertion and removal of the retention element / connector. In Figures 35 to 38 there are illustrated retaining elements / connectors having only one leg, but having retention tabs of different shapes. The approximately right angle bend in the fluid path, necessary to fit in the second recess 55 and in the horizontal guide 67 of the pump housing 41, is made in the third section 64 of the flexible pipe, which is bent immediately adjacent to its connection with the retention element / connector 56g-56j. These folds in the third section 64 of flexible tubing are shown in Figures 35 to 38. The flexible tubing must be of a material that does not unduly restrict the flow of fluid from a peristaltic pump when it is bent approximately at a right angle over a radius. less than about 1.25 centimeters, and preferably should not do so when bending over a radius of approximately 0.9525 centimeters (0.375 inches). However, it is understood that a retaining element / connector used to connect the second and third sections of flexible tubing, must have a retaining tab 65g-65, extending substantially normal to the vertical leg 61g-61, to be coupled in a manner complementary with a recess retention 55 in the housing 41 of the pump. More preferably, the retaining tab has a flange 79 extending in a substantially normal manner therefrom, to engage with a recess in the housing of the pump. When the fluid transfer apparatus is assembled with the peristaltic pump, the third section 64 of flexible tubing extends from the connection of the first end 63 thereof, to the second leg 62 of the retaining element / connector 56 along the length of the horizontal guide 67 formed in the front wall 45 of the housing 41 of the pump. As best seen in Figure 3A, the guide 67 connects to, and leads from, the second recess 55, to a sidewall of the front wall 45 of the pump housing 41, here the closest sidewall. In a preferred embodiment, the third section 64 of flexible tubing extends horizontally from the retaining element / connector to a lateral side of the front housing wall of the pump, and then extends to an adapter or connector 64a to connect the second. end of the third section of flexible tubing with a device, such as a feeding tube or a needle, leading into the body of a patient. Some examples of these devices are, in enteral administration: a feeding tube 69 which is seen in Figure 1, and a feeding tube 69a which is seen in Figure 19, each extending through a gastrostomy 70 inwards. of the stomach 174; a nasogastric tube 171 leading down the esophagus into the stomach 174, as seen in Figure 17; a jejunal feeding tube 186 that extends through a jejunostomy 173 to the jejunum 187, as seen in Figure 18; or, in parenteral administration: a needle or other tubular inlet 88 leading into the vein 87 of a patient, as seen in Figure 20. As already mentioned above, it is also understood that the third section of tubing can be integral with a suitable device to be inserted in the body of a patient. The positioning of the guide 67 horizontally, to place the third section 64 of flexible tubing out of horizontality from the pump housing 41, is believed to be preferred by the attendants over an arrangement of the flexible tubing in an upward arc. as it emerges along a guide from a pump housing according to the prior art, as seen in Figures 21 and 22. Attendees have less difficulty with maintaining the present apparatus in a careless and uncomplicated work order. , especially when they take care of uneasy patients. The retention element / connector used in the practice of the present invention can also take one of the forms 56g-56j shown in Figures 35 to 38, in each of which the right angle bend of the fluid path is achieves in a segment of the third section 64 of flexible tubing, immediately adjacent to the retaining element / connector, instead of inside the retaining element / connector. In the use of the retainer elements / connectors 56g-56j of Figures 35 to 37, the third section 64 of flexible tubing must be bent into the horizontal guide 67, but must not bend so sharply as to unduly restrict fluid flow. through the fold. In using the retainer / connector element 56j of Figure 38, the third section 64 of flexible tubing is directed horizontally forward, and special care must be taken to prevent the unsupported tubing from bending down too sharply as to block the flow of fluid through it. The use of retention elements / connectors with the right angle bend inside the retention element / connector is preferred. However, if desired, the assembly of the invention having a retention element / connector 56k can be used in the alternative manner shown in Figure 39. In the retention element / connector 56k, the right angle bend of the element The retention / connector is projecting forward and horizontally from the second recess 55, and not towards the horizontal guide 67. As seen in the fragmentary sectional views of Figures 40 and 41, the second end 60 of the second section 49 of FIG. flexible tubing, is connected with the lower leg 61k of the retainer / connector 56k, and the retainer / connector element 56k, with its retaining tab 65k, fits in an interlocking manner in the second recess 55, projecting the another leg 62k of the detent element / connector 56k forward and in a dog leg shape, into a second right angle bend, with a third leg 62k 'extending upwards. The first end 63 of the third section 64 of flexible tubing is put in telescope on the third leg 62k 'to make a connection with this form of retaining element / connector 56k, and the third section 64 of flexible tubing is allowed to arch over and going down to the connection with the patient.

In the assembly of the fluid transfer apparatus 42 with the peristaltic pump 40, the second "flexible pipe 49" slides laterally inwardly of the guide 50 by means of a vertically extending slot 50a (as seen in the Figure). 8), and then the drip chamber 43 slides down into the guide from the top of the pump housing, until the first retainer 47 is seated in the first recess 44, with the bottom edge of the side wall 73 on the rear side of the recess retentively located between the protuberances 71 and the rear wall of the first recess 44, as can be seen in cross section in Figure 4A. fluid transfer 42 assembled with the housing 41 of the pump, with the second section 49 of flexible tubing under sufficient tension between the first recess recess or receptacle 44 and the second recess or retention or receptacle 55, such that the second section of flexible pipe 49 is under tension, and pressed against the rollers of the peristaltic rotor 52, to facilitate peristaltic pumping when the peristaltic rotor is rotated. As can be seen in Figure 3 and Figure 4A, the guide 50 of the retaining recess 44 is most preferably provided with a substantially vertical groove 81 in the side wall 76 of the guide, with an opening 81a formed in the wall of the guide. the groove 81, the opening opening into the interior of the housing 41 of the pump. A similar groove or opening (not shown) is provided on the opposite side of the guide 50, and the opening aligned with the opening 81a, such that a light or signal source (not shown) can be directed into the housing 41 of the pump, through the opposite openings, and with the drip chamber 45 therebetween, to a conventional detector, such as a photocell (not shown), for the detection of fluid droplets moving through of the drip chamber 43. The electronic element inside the pump housing can be programmed to stop the pumping operation if a continuous series of fluid drops is not detected. The use of this system is highly preferred as a good precautionary practice. If desired, an opening 67 can be provided between the horizontal guide 67 and the vertical guide 50, as shown in Figures 3 and 3A, to facilitate the molding of the pump housing. Turning again to Figures 2 and 3, and particularly to Figure 3A, and also referring to the sectional views of Figures 7, 8, and 8A, the second retention recess 55 is preferably formed with flanges 78, 78a and? the front edge of the recess, and more preferably one of these tabs is formed on the front edge, on each side of the slot or notch 58, for better retention of the retention element / connector 56. As can be seen more clearly in the Figure 8A, the retaining tab 65 of the retainer / connector element is preferably formed with a flange portion 79 on its bottom side, to be adjusted in a complementary manner behind the flange 78 on the left side of the slot 58, as shown in FIG. see from the front of the housing 41. The second recess 55 is also provided with sufficient lateral depth to the left of the slot 58, to accommodate the retaining tab 65 behind the flange 78, and the wall of the recess, as shown in FIG. can be seen illustrated in Figure 8. In this establishment, the retention tab 65 for the positive interacure achieved with the flange or tabs 78, 78a, of the second recess of retention. It is preferred that a clamping valve 80 be used as a component of the fluid transfer apparatus as a precaution against unintentional or uncontrolled fluid flow, in the event that the fluid transfer apparatus 42 is dislodged from the fluid housing. bomb, wherein the rollers 53 of the rotor 52 of the peristaltic pump do not control the flow of fluid. Referring to Figures 2 to 5 and 12 to 16, a clamping valve 80 is shown, such as that illustrated in Figure 12, mounted on the second section 49 of flexible tubing, between the peristaltic rotor 52 and the second recess of retention 55, which is a preferred location for the tightening valve. However, it should be understood that the clamping valve can be located between the drip chamber outlet and the peristaltic rotor if desired. The tension on the second section 49 of flexible tubing must also be sufficient to de-tighten the clamping valve 80 sufficiently for a fluid flow substantially unimpeded therethrough, and the clamping valve must respond to the voltage level that is enough for proper action of the peristaltic rotor. As indicated, it is preferred to employ, with the fluid transfer apparatus of the invention, a clamping valve that can be used to tighten and close the flexible tubing at some point along the fluid path, and preferably the Tightening valve is an automatic operation and responds to stress, especially to the lack of it. Preferred tightening valves tighten or twist the flexible piping enough to block the flow of fluid through the flexible piping when there is not sufficient tension on the flexible piping where the tightening valve is located. Accordingly, if the fluid transfer apparatus is dislodged from the pump housing, or the fluid transfer apparatus is not properly assembled with the pump housing, and the flexible tubing is not pressed against the rollers of the peristaltic rotor, the clamping valve will substantially impede the flow of fluid through the fluid transfer apparatus. In Figure 12 a preferred form of clamping valve member is shown, and consists of a single member 80 formed of an elastically flexible polymeric material, such as silicone rubber or similar to the silicone rubber used in the second section of flexible tubing. of the fluid transfer apparatus, but having shortened cylindrical tubular segment end portions 82, 83 connected by a semi-cylindrical case rod portion 84 integrally formed therewith. In a working mode, the internal diameter of the clamping valve element 80 before assembly, is actually smaller than the external diameter of the second flexible pipe portion of the feeding apparatus 42, which results in good position retention on section 49 of flexible pipe when assembled. In the working mode, the clamping valve member is die cut from the same kind of flexible tubing that is used as the second section of flexible tubing in the fluid transfer apparatus. Referring now to Figures 13 and 14, the clamping valve member 80 is installed on the flexible tubing, such as the second section 49, with one end of the clamping valve element located at a distance "E" from the end of the pipe, in such a way that the other end of the clamping valve element is located at a distance B from the end of the pipe, sufficient to facilitate the connection of the pipe with another component. The tubular segment end portions 82, 83 of the tightening valve element are spaced apart at a distance "C" along the flexible pipe 49, while the shank portion 84 assumes a "D" length when it is not under tension, the length "D" being sufficiently shorter than the length "C" to bend over, and tighten, the pipe to close it when it is not under sufficient tension to stretch the rod portion 84. As an example, with a 0.33 centimeter flexible silicone rubber tubing (0.131 inches) of internal diameter, 0.51 centimeters (0.199 inches) of external diameter, and a wall thickness of approximately 0.086 inches (0.034 inches), and with a tightening valve element 80 cut from the same type of pipe that has the inner edges of the tubular end portions 82, 83 separated by a stem portion at approximately 0.51 centimeters (0.199 inches) in length when not under tension, the inner edges of the tubular end portions 82, 83 must be separated by a distance of approximately 2.0 centimeters (0.80 inches) when installed telescopically on the second section 49 of flexible tubing, in order to obtain a desired tightening or twisting to block the flow of fluid. For a given elastically flexible pipe, the dimensions are very important to obtain the desired valve action, with a good opening, and a sufficiently positive closure. The length of the flexible pipe comprised between the tubular segment end portions of the clamping valve member, it is especially important, to obtain a sufficient bend for a sharp bend, but not so much as to form a looser cycle. This can be determined empirically by trial and error for a flexible pipe of a given size made of a material with a given modulus of elasticity. In Figure 43 there is shown an alternative tightening valve element 80a having a substantially planar rectangular rod portion 84a, which connects the substantially planar rectangular end portions 82a, 83a. The end portions 82a, 83a, each have a concave surface adapted to conform in conformation against the outer cylindrical surface of the flexible pipe 49, and are bonded or adhered thereto, as seen in Figure 42 after folding the flexible pipe section encompassed by the clamping valve element, such that the connection with the length of the rod portion 84a can be made much shorter than the length of the flexible pipe section encompassed in the resulting tightening valve. In Figure 45, another alternative tightening valve element 80b is seen which is configured as the capital letter "I", and is formed of a flexible, elastic, flat, sheet-like polymeric material. The clamping valve member 80b is attached to the flexible tubing 49, wrapping the wider leaf-like end portions 82b, 83b substantially around the flexible tubing, and bonding or adhering to each other, as seen in Figure 44 , at longitudinally spaced locations of the flexible tubing 49, that the length of the rod portion 84b, wherein the flexible tubing section encompassed by the end portions 82b, 83b is bent, and tightened to close as shown in FIG. Figure 44, when the flexible pipe 49 is not under a longitudinal tension. In Figure 47, yet another alternate tightening valve element 80c is seen, wherein a portion of rod 84c which has an arcuate cross-section of half a cylinder or a semi-cylindrical shape, joins the arcuate end portions 82c, 83c that are grooves precisely on the concave surface that engages the outer cylindrical surface of the flexible pipe 49, as shown in Figure 47A. As in the case of the other clamping valve embodiments illustrated herein, flexible pipe 49 is bent during the assembly of the clamping valve shown in Figure 46, such that the enclosed section of the flexible pipe it will be much longer than the shank portion 84c of the tightening valve element. The thermal bonding or the adhesion of the end portions 82c, 83c of the clamping valve member with the flexible pipe 49, terminates the manufacture of the clamping valve shown in Figure 46. In Figure 49 there is still another element of 80d alternative tightening valve, wherein the shank portion 84d and the end portions 82d, 83d, are all part of a semi-cylindrical jacket-like piece of elastically flexible polymeric material, shown in Figure 48, attached, for example by link or a adhesive, with flexible pipe 49, to form another embodiment of the clamping valve of the invention. Again, in the bonding or bonding of the rod portion 84d with the flexible pipe 49, the pipe section encompassed by the clamping valve member bends sharply, such that the end portions 82d, 83d of the element of the clamping valve will be joined at longitudinally spaced locations along the flexible pipe 49, such that the pipe section encompassed by the clamping valve member will be substantially longer than the rod portion 84d, to provide the effect of valve that responds to tension. In Figures 50-52, another embodiment of the tightening valve member 80e, assembled with a length of flexible tubing, is partially illustrated, and also fully illustrated. The clamping valve member 80e comprises shortened tubular segment end portions 82e, 83e joined by a rod-shaped rod portion or portion 84e. The end portion 82e is initially inserted molded into the flexible tubing 49, as well as the positioning collar 86, which is spaced apart from the end portion 82e by the intended length of covered tubing section. The section of the flexible pipe 49 positioned between the tubular segment end portion 82e and the positioning collar 86, then bends sharply, and the tubular segment end portion 83e slides over the adjacent end of the flexible tubing 49, up that the end portion 83e is against the positioning collar 86, wherein the tubular segment end portion 83e is bonded or adhered in place, thereby forming the clamping valve illustrated in Figure 51. As shown in Figure 52, when the pipe 49 is placed under sufficient longitudinal tension, the rod portion 84e gives performance, and the covered pipe section is straightened sufficiently so that the fluid can flow therethrough.

Referring now to Figures 53 to 55, another embodiment of a tightening valve member 80f is seen, having eye-shaped or closed-loop end portions 82f, 83f, joined by a narrower shank portion 84f. An end portion 82f of the clamping valve member is telescopically positioned around the flexible tubing 49, at a selected distance from one end thereof, and then the flexible tubing is sharply bent between the position of the end portion of the element of tightening valve 82f, and the nearest end of the flexible tubing, and the other end portion 83f is telescopically placed around the flexible tubing to a position defining a covered flexible tubing section, and the end portions are interconnected or stick in their place. For example, a polymeric silicone composition that is vulcanized at room temperature can serve as a suitable adhesive to be inserted lengthwise, or just below the margins of the end portions of the tightening valve element. The finished clamping valve responds to the tension, closing when it is not under tension, as seen in Figure 54, and being able to open under sufficient tension, as illustrated in Figure 55. Referring now to Figure 56, it is done still another form of tightening valve responsive to tension, by molding a sharply bent part of a highly elastic spring material, such as a metal spring wire 181, or a suitable polymeric material, into the wall 182 of a section of flexible pipe. The memory of the sharply bent spring material causes the flexible tubing to tighten to close when there is not enough longitudinal tension applied to the flexible tubing. As seen in section in Figure 57, the wall of the pipe becomes thicker along a longitudinal side, to accommodate the molding of the highly elastic spring material therewith. In yet another form of tightening valve that responds to tension 80H, a sharply bent piece of a highly elastic spring material, such as a spring wire 181, or a suitable polymeric material, can also be molded onto, or adhered to, the exterior of the wall 183 of the flexible pipe, as indicated in the sectional view of Figure 57A. Using another mode of action, a tensioning valve is made responsive to the tension, using a spring-loaded tightening valve element, which is preformed with a memory which causes the ends of the valve element to be twisted sufficiently to close the chamber of the valve. a flexible pipe telescopically encompassed by the valve element. This clamping valve element is identified by the reference numeral 80i in Figure 58, wherein the clamping valve member, having the tubular segment end portions 82g, 83g, and a rod, in the form of a plurality of longitudinal ribs 84g that are twisted helically, which connect to the end portions, are shown assembled telescopically on a length of flexible pipe. During assembly, the tightening valve element 80g is placed under a longitudinal tension to straighten the longitudinal ribs 84g, while the flexible pipe section 49 is inserted through the tightening valve element, and is bonded or adhesively bonded thereto, while maintaining the longitudinal tension on the tightening valve element 80g. When the longitudinal tension on the assembled clamping valve is relaxed, the clamping valve element 80g twists the covered section of the flexible pipe, tightening it to close it. Under tension, the resulting pressure valve is untwisted to unclamp the flexible pipe, allowing the passage of fluid through it. Accordingly, it is evident that many embodiments of the tightening valve element employed in the present, they can be made in many different forms from an elastically flexible polymeric material, and can be configured to have two end portions connected by a rod portion. The end portions must be able to be attached to the flexible tubing from which the clamping valve is formed, and they must be joined with the end portions spaced a greater linear distance along the flexible tubing than the length of the rod portion. not stretched from the clamping valve member, at a relative distance in the range of about 4: 1, varying only slightly as will be seen, in accordance with the resistance to elastic performance of the rod portion of the clamping valve member, and the bend resistance module of the flexible pipe, such that the pipe section covered will be tightened or twisted sufficiently by the pull of the rod portion when the tightening valve is not under tension, in such a way that the closure or occlusion of the fluid flow through the flexible tubing takes place. In all the modes, the portion of the rod must be formed elastically under an appropriate tension for the establishment in which the valve is used, in such a way that the clamping valve opens under a longitudinal tension applied to the flexible pipe for the operations or procedures that are being carried out, and still close when tension is released or absent.

A clamping valve responsive to the tension of the type shown in Figures 11 to 16 has been assembled, by placing the clamping valve member over a length of pipe, using the assembly apparatus disclosed herein, which has utility for placing a flexible, and at least a little elastic, shortened tubular segment telescopically on and near one end of a length of pipe having an external diameter substantially equal to or greater than the inner diameter of the tubular segment. A very important aspect of the assembly apparatus disclosed herein is the ability to eject the assembled combination of a flexible tubular segment a length of pipe from the assembly apparatus, without displacing the flexible tubular segment longitudinally along the length of the pipe. For the purposes of the specification and the claims, it is to be understood that the side or the front surface, also referred to herein as a first surface of the assembly apparatus, is the side or surface where the section of the insert is inserted. pipe for placing a flexible tubular segment thereon, while the rear side or surface is opposite the side or the front surface. A forward movement is a movement to the side or to the front surface as defined herein, while a backward movement or extension is taken in the opposite direction. As seen in the example embodiment shown in Figures 59 to 61, and in the sectional view of Figure 63, together with the part separated view of Figure 64, the present assembly apparatus is formed of a portion of body, indicated generally by reference numeral 341, which, if desired, may have a base support portion 342, which may be secured to a base plate 343, for example by screws 403 if desired, to have stability during use. It should be understood that the support structure can take any suitable shape and orientation, and its parts can be joined together by any suitable elements, such as welding or fastening. As seen in Figure 64, the example assembly apparatus consists primarily of the body portion and the appropriate base or support portions, in addition to a sub-assembly, indicated generally by reference numeral 330, a cover plate 347, a first retaining ring 352, a control ring 357, a second retaining ring 366, and a rear support member 374. In the assembled apparatus, the subassembly 330, which has the finger portions extensibly controllable extensible and retractable, is placed in a cylindrical hole 344 that extends through the body portion 341 from the first front face, to the second rear face, and the other components are joined in the sequence and in the positions indicated , using screws and bolts 402, 405, 406, 407, 408, or other suitable fasteners. The combination of the sub-assembly 330 with the extensor finger elements 339, as seen in the separate view in parts of Figure 68, together with the cover plate 347 and the control ring 357, when mounted in the portion of body 341, comprises a mechanical element for assembling a tubular segment with a section of pipe. Moreover, an integral part of the subassembly positioned concentrically and reciprocably inside the mechanical element for assembly, constitutes an element for ejecting an assembly from a tubular segment with a length of pipe, as will be further described herein. The element for the assembly including a mechanical element for extending and retracting the extensor finger elements 339, is described in detail below, and is comprised primarily of: (1) a substantially cylindrical revolving sleeve 149, which can rotate in the hole cylindrical 344 of the body portion 341 of the apparatus. (2) a control ring 357 for rotating the rotating sleeve 349; (3) a disc-shaped member 354 having radially extending, i.e. spirally extending, spiral guides 360 formed therethrough and which are mounted coaxially on a first end of the rotating sleeve 149 in an annular recess; and (4) at least three extensor finger elements, indicated generally by the numeral 339, which are supported by a combination of the disc-shaped member 354, and a cover plate 347, and which extend or retract radially by the constraint of the disc-shaped member and the cover plate with the finger-expander elements. The ejector element comprises: (1) a reciprocable piston 362, illustrated in Figures 67 and 68 as part of the assembly apparatus shown at different stages of the assembly process; (2) an ejector block 368 or 368a as illustrated in Figures 65 and 66; and (3) ejector arms 371, in addition to the rotatable sleeve 149 in the cylindrical passage with which the piston 362 is reciprocable. The subassembly identified by the reference character 330 in Figures 64, 68, 70, and 71 , includes the substantially cylindrical rotating sleeve 149, with a cylindrical passage extending therethrough, and into which the reciprocable piston is coaxially positioned, indicated generally by numeral 362. The reciprocable piston has a recess in a end, wherein an ejector block is coaxially positioned, such as the ejector blocks 368 and 368a illustrated in Figures 65 and 66. The ejector block has a plurality, in this example 3, of longitudinal slots 370 therein, and over the which are pivotally mounted, using the bolts 371b, the ejector arms 371 substantially parallel to the longitudinal axis of the piston 362, keeping in mind that, when the assembly apparatus is fully assembled the piston is coaxial with the hole 344 through the body portion 341. In a recess of the first end 365 of the piston 362, an ejector block 368, such as the ejector block shown in the Figure, is mounted in any suitable manner. 65. The ejector block shown in Figure 65 has a tongue-shaped portion extending rearward 338, which fits into a complementary hole or passage 336 in the piston 362, and is secured by an adjusting screw 337. The longitudinal length of the ejector block used in the assembly apparatus determines the distance from the end of the section of pipe where the pipe segment will be placed during the assembly process. In the assembly of a clamping valve element with two tubular segments as end portions, it is necessary to assemble each tubular end portion with a given length of tubing in a separate operation, where an assembly apparatus is used as an ejector block. that has the appropriate length. Accordingly, a shorter ejector block, such as the one shown in Figure 65, would be used to place the first tubular segment, for example 82, while a longer ejector block 368a would be used as shown in the Figure 66, in the assembly of the second tubular segment, for example the 83, with the section of pipe, to obtain the appropriate positioning of the tubular segments and also reach the appropriate separation longitudinally along the flexible pipe between the tubular segments. The ejector block 368a is provided with a forwardly projecting axial extension 338b that has a cross section large enough to serve as a stop for the pipe section, but is small enough to facilitate the use of the coil spring 363 to make the piston 362 recovers after the ejection step. In the assembly of the present apparatus, the sub-assembly 330 shown in Figure 64 is formed by selecting an ejector block 368 (or alternatively, the ejector block 368a of Figure 66) of suitable dimensions, such as the ejector block illustrated in Figure 65, and the placement of a plurality of pivotal ejector arms 371 in the respective slots 370 formed on the sides of the ejector block 368, wherein the ejector arms are pivotally retained by the pins 371a that they pass through the walls of the grooves and through the ejector arms near a first end 333 of each arm. The number of ejector arms 371 and complementary slots 370 preferably used is at least 3 to match the number of extensor finger elements 339. The ejector arms 371 are oriented substantially parallel to the axis of the ejector piston 362. The portion in the form of projected backward tongue 338 of ejector block 368 is inserted into axial hole 336 at end 365 of piston 362, and secured with a set screw, as shown in Figure 63. Referring now to Figures 63 and 68, an elongated central guide rod 369 is inserted and secured in any suitable manner in a longitudinal axial hole 334 of the free end of the ejector block 368, or in a longitudinal axial hole 334a of the axial extension 338b of the ejector block 368a, if the longer extension block is part of the sub-assembly. Turning again to Figures 67 and 68, an elastic annular member 372, which may be a conventional "O" ring, is placed around the ejector arms 371 at approximately half the length, for example in the notches 335 of the arms , to retain them grouped around the extensor finger portions 358 in the final assembly.

Adjacent to the second end 332 of each of the ejector arms 371, there is a longitudinally extending elongated slot 373 formed therethrough. Through each of the slots 373, a respective leg portion 356 of the extender finger member 339 extends radially outwardly from the piston axis line 362. As seen in Figures 68, 69, and 71, extensor finger elements 39 are "L" shaped, each with a leg portion 356 and a thin finger, i.e. finger portion 358. To accommodate reciprocal movement of the ejector arms 371 along the line axially during an ejection step without interfering with the normal function of the extensor finger elements 339, the leg portion 356a joining the finger portion 358 with the leg portion 356 in each element, preferably becomes sufficiently thin for that the sides of the slot 373 are not fixed against the leg portion 356a. The element for assembling a tubular segment telescopically over a length of pipe is part of the sub-assembly 330, which includes the extensor finger elements 339. The mechanical elements for radially extending the extensor finger portions include the disc-shaped member. 354, as well as the rotating sleeve 149 on which the disc-shaped member 354 is mounted. The cover plate 347, with its radial channels 355, although not part of the subassembly 330, is also an essential part of the mechanical element for extending and retracting the extensor finger portions in cooperation with the disc-shaped member 354 and its spiral guides 360. As best seen in Figure 69, each extender finger element 339 is provided with a guide pin 359 extending laterally from about half the length of the leg portion 356, to extend into a spiral guide 360 of the disc-shaped member 354 immediately e adjacent. With the extensor finger elements 339 constrained by the radial channels 355 of the cover plate 347, in such a way that they can not rotate, the rotation of the disc-shaped member 354 provides a cam-like action when the guide pins 359 are forced to slide along the respective spiral guides 360, moving the extensor finger members 339, and their finger portions 358, radially outward or inward, depending on the direction of rotation. In an additional assembly of sub-assembly 330 of the Figure 64, as seen in Figure 70, slides a coil spring 363 over the group of ejector arms 371, followed by the disc-shaped member 354, in preparation for attaching it by threaded fasteners 401 to the annular end face of the rotating sleeve 149, after sliding the piston 362 further into the passageway of the rotating sleeve 149, as seen in Figure 71. Also as seen in Figure 71, the extensor finger elements 339 are placed with the portions of finger 358 grouped concentrically within the group of ejector arms 371, and around the center guide rod 369. The subassembly 330 seen in Figure 64, and largely contained within the rotary sleeve 149, can be insert now into the body portion 341 from the first front side 345 thereof, inside the hole 344, and extend partially beyond the second rear side 346 of the body portion 341, and positioned as seen in FIG. to Figure 63, such that the cover plate 347 can be joined by threaded fasteners 402 preferably using a locator bolt 404 to align the grooves on the back side of the cover plate (described below) in the required operational orientation. The inner face, ie the back side, of the cover plate 347, as seen in Figure 72, is formed with radial channels 355, wherein the respective leg portions 356 of the extensor finger elements 339 can reciprocate when they are placed in it, with the cover plate attached with the inner face turned face to face with the disc-shaped member 354. The radial channels 355 formed on the inner face of the cover plate 347, and with the leg portions 356 of the elements of finger extenders 339 placed therein, are necessarily open towards the disc-shaped member 354, such that the guide pins 359 can extend inward, and slide along, the spiral guides 360. Referring again more particularly to Figures 63 and 64, it is seen that the body portion 341 encompasses the cylindrical hole 344, which is of a relatively large diameter compared to the body portion, and extends from the first surface or side 345, to the second surface or side 346 of the body portion. Although the assembly apparatus is shown in the figures of the drawing supported on a base, with the assembly apparatus oriented to receive an end portion of the section of pipe arranged in a substantially horizontal manner during the assembly process, it is to be understood that the The base can be modified, if desired, to support the apparatus with the hole inclined upwards at any angle to receive the section of pipe, including facing it substantially vertically upwards, without departing from the scope of the invention. In this case, the first front side of the apparatus as described herein, would be the side or upper surface, and the second rear side would be the side or bottom surface of the assembly apparatus. The first surface 345 of the body portion 341 is substantially covered by the circular cover plate 347, with an opening 347a located at its center, while the second surface 346 of the body portion 341 is faced with a first retaining ring 352 having an internal diameter slightly smaller than the diameter of the cylindrical hole 344. The cover plate 347 and the first retaining ring 352 are fastened to the body portion 341, for example, by screws 402, 405, respectively, but it should be understood that any suitable element can be employed to retain these components in their relative operable positions. As best shown in Figures 63 and 64, inside the cylindrical hole 344, as indicated above, there is a substantially cylindrical rotating sleeve or tube 149, having a first end 350 and a second smaller end 351. The rotating sleeve 149 is retained in the cylindrical hole 344 by a flange or shoulder 353 of the rotating sleeve, which engages, or fits against, the radially inner portion of the first retaining ring 352 in the vicinity of the second surface 346 of the portion of body 341, and a radially outer flange portion, projecting forward 350a of the first end of the rotating sleeve, is retained by the cover plate 347. Although the first end portion 350 of the rotating sleeve 149 has an outer diameter larger than the second end portion 351, and consequently, that the flange or shoulder 353, the internal diameter of the cylindrical passage through the rotating sleeve is uniform rme, and the rotating sleeve will be referred to herein as substantially cylindrical. The second end 351 of the rotating sleeve 149 is disposed outside the cylindrical hole 344 and the first retaining ring 352, and is concentrically surrounded by a rotating control ring 357, preferably of a slightly larger diameter than the first retaining ring 352, and preferably having a gnarled perimeter surface and / or a lever 361 extending therefrom for easy handling. The control ring 357 is screwed or otherwise attached, in any suitable manner, to the rotating sleeve 149. The first end 350 of the rotating sleeve 149, has a recessed annular end face, having a perimeter flange 350a, as indicated. In the annular recess, radially inwardly of the flange 350a, the disc-shaped member 354 is fitted, which is screwed or otherwise fixedly fixed to the end face, and has a central opening 354a of the same diameter as the central opening 347a of cover plate 347, but slightly smaller than the internal diameter of the passage through rotating sleeve 149. The rotating disc-shaped member 354 has a face that contacts the annular recessed end face of the rotating sleeve 149, with which it joins, and the opposite face is face to face with, and can rotate against, the inner face of the front cover plate 347, which is attached to the body portion 341 and can not rotate . As seen in Figures 79 and 81 in dotted diluting, and perspective in Figure 72, the reverse side of cover plate 347 is provided with three equiangularly spaced channels 355 that open at the sides towards the disc-shaped member. 354, and extend radially outward from the central opening 347a of the cover plate. Inserted in a reciprocable manner into each radially extending channel 355, from the central opening 347a, there is a leg portion 356 of an "L" -shaped extensor finger element, generally indicated by the reference numeral 339. of extensor finger 358 extend outwardly from the central opening 347a of the front cover plate 347, substantially parallel to the axis of the hole 344, to form a group, and it is this group which is manipulated radially apart to extend a tubular segment, such as a tubular segment end portion of a clamping valve element, to allow the telescopic assembly thereof on, ie, concentrically with, a length of pipe. The extensor finger portions 358, on which the tubular elements are placed for extension, i.e. stretching to a larger cross-sectional opening, during the telescopic assembly of a flexible tubular segment with a pipe section in accordance with The invention is preferably very thin for easier removal of the assembled combination of the tubular segment and the pipe from the assembly apparatus. In this regard, it should be noted that the extenders fingers 358 are sandwiched between a tubular segment end portion 82, 83 of the clamping valve member and the line 49, when the extenders are retracted prior to the expulsion step. In Figures 68, 70, and 71, it is shown in disc-shaped member 354, which has formed therein three spiral guides extending radially, i.e., spirally, outwardly 360, having the sides open towards the cover plate 347. Each spiral guide extends spirally outward in the same direction of rotation from the central opening 354 of the disc-shaped member 354. Each leg portion 356 of a respective "L" -shaped extensor finger element. 339, is provided with a guide pin 359 fixedly attached thereto, which extends laterally from the radial channel 355 of the cover plate 347, wherein it reciprocates the leg portion 356, into one of the spiral guides 360. along which it is slidable. Instead of the shown spiral guides cut entirely through the disc-shaped member 354, the guides 360 can be cut grooves with the same pattern, if they are each deep enough to easily receive and guide in a slidable manner to a pin. guide 359 during rotation of the disc-shaped member 354, and the grooves have the open sides towards the cover plate 347. On the rotation of the disc-shaped member 354, using the knotted control ring 357 or the lever 361 for rotating the rotating sleeve 149 with which the disc-shaped member 354 is attached, a cam-type action is obtained to radially extend or retract the extensor finger portions 358 away from or toward the common axis, when the leg portions 356 are moved radially by the respective guide pins 359 that slide in the grooves spirals 360. If desired, lever 361 can be attached to control ring 357, as seen in Figure 64, and used to rotate control ring 357 through a sufficient arc to obtain extension and retraction desired portions of the extensor finger 358.

Placed in the cylindrical passage of the rotating sleeve 149, and extending backward therefrom, is the reciprocable piston 362 which reciprocates through a short range of motion within the cylindrical passage of the rotary sleeve 149, to perform the very important ejection procedure. The piston 362 is spring-biased outwardly from the passageway of the rotating sleeve 149 by a coil spring 363 which abuts on one end of the coil spring against the annular portion of the face of the disc-shaped member 354 that is extends radially inward from the central opening of the rotary sleeve 149, and at the other end, against the first end 365 of the piston 362. The rear portion 364 of the second end of the piston is of a diameter slightly smaller than the first portion 365 the rear end of the largest diameter portion constituting a shoulder on the piston, and the second retaining ring 366 attached to the control ring 357 having a central opening sufficiently smaller than the largest diameter of the first end portion. 365 of the piston, to trap the shoulder and limit reciprocation of the piston 362 in the backward direction. Mounted in a recess 336 in the face of the first end 365 of the piston 362, there is an ejector block 368 that is dimensioned longitudinally to serve as a stop, in order to precisely limit the depth of insertion of a section of pipe on which is going to place a tubular segment, such as a clamping valve element. In Figures 84 and 85, an assembly apparatus with an ejector block 368a is shown in section, with a longer axial dimension that provides a more superficial stop for the flexible tubing inserted in the apparatus, for the purpose of assembling the second portion. of tubular segment end of a clamping valve element as a second step in the process of assembling a clamping valve. A central guide rod 369 extends axially from the ejector block 368 or 368a through the passageway of the rotating sleeve 149, and substantially towards the outer ends of the extensor finger portions 358, where it is centered between them. This serves as a guide on which the flexible tubing is inserted into the assembly apparatus.

Also pivotally mounted, are the ejector arms 371 extending forwardly along the interior of the passageway of the rotary sleeve 149, and almost parallel to the common axis and outwardly through the opening 354a in the disc-shaped member 354. and in the opening 347a in the cover plate 347 where each rests against the radially outer surface of a portion of the extensor finger 358, which are collectively forced in an elastic manner against the respective extensor finger portions by an elastic spring-loaded annular member. 372, such as an "O" ring. The ejector arms 371 must be selected to be of the proper length to make contact and abut against the edge of a flexible tubular segment, such as a tubular end portion of a tightening valve element, which has just been placed on a stretch of flexible tubing extending into the apparatus, simultaneously with contact and pressure between the ejector block and the inner end of the flexible tubing inside the apparatus, in order to prevent movement or displacement of the tubular end portion longitudinally of the flexible pipe during ejection. Due to the radially inward elastic tension of the tubular end portions of the clamping valve member on the flexible tubing, which has an internal diameter as large or greater than the internal diameter of the tubular segments, it is practically not feasible to remove the assembled tightening valve of the spreading fingers, without risking altering the positions of the tubular segment end portions of the tightening valve element, unless the expulsion components of the device are used. The second part 364 of the reciprocating ejection piston 362 is shown in Figures 60 and 63, supported by a support member 374 having a lower section 375 thereof attached to the back of the base portion 342 of the assembly apparatus, and an erect leg portion 376 extending upward to contact the rear portion 364 of the piston, which can be slid over the upper end with flange 377 of the leg portion 376. A section 378 of the underside of the part rear 364 of the piston 362, is grinded to lie flat from adjacent the second end to the larger diameter front portion 365 of the piston 362, and it is this planar section that rests on the upper end with flange 377 of the leg portion 376 of the support element 374. The flat nature of the lower side section 378 serves to prevent the piston 362 from rotating during use, and the shoulders 378a to 378b formed at each end of the the flat section 378 are trapped, respectively, on the upper end with flange 377 of the support element 374, and on the second retaining ring 366, to provide respective abutment actions in the reciprocal movement of the piston 362. The base, the portion of body, and parts such as the cylindrical sleeve, the reciprocable piston, the control ring and both retaining rings, the cover plate and the disc-shaped member, of the assembly apparatus, can be made of light steel, or of an easily machinable metal, such as an aluminum alloy, if desired, but preferably made of tool steel or stainless steel. Preferably, the extensor fingers and the ejector arms are made of tool steel or stainless steel, to provide greater strength and durability in the thinner members. In the manufacture of a clamping valve responsive to the tension of the class defined herein, it is essential, for an appropriate valve action of the clamping valve, that the tubular segment end portions of the clamping valve element they are placed with some precision separated by a rather short longitudinally, i.e. linearly, length of the pipe, with the magnitude of the gap or separation substantially greater than the length of the shank of the tightening valve element. This larger linearly spaced along the pipe is essential in order to obtain a bend over the pipe that produces a clamping closure of the covered portion of the pipe when there is no tension on the portion of the pipe section that includes the clamping valve by itself, and the rod of the clamping valve element tends to elastically assume its normal length approximately, directing the tubular segment end portions joined mutually closer together. The proper spacing during the telescopic assembly can be easily achieved in an efficient and convenient manner, using two nearly identical embodiments of the assembly apparatus described herein, which differ primarily because they have ejector blocks of different lengths suitable for assembling the respective tubular segments. The ejector blocks serve as stops on advancing the length or end extension of the length of the flexible tubing that can extend into the assembly apparatus during the assembly process, thereby controlling the placement of the end portions of the assembly. tubular segment.

The first embodiment of the assembly apparatus used will have a relatively short ejector block, such as that which is identified by the reference numeral 368 in Figures 63 and 67, and as shown in the perspective view of Figure 65 in such a manner. that the end of the pipe section will extend relatively deep inside the assembly apparatus, and the first tubular segment end portion of the pressure valve member will be positioned far enough away from the inserted end of the flexible pipe, to leave room for placement of the second tubular segment end portion. The telescopic assembly of the second tubular segment end portion can only be made closer to the inserted end of the pipe section, using the assembly apparatus, than the location of the placement of the first tubular segment end portion. The second embodiment of the assembly apparatus used to telescopically assemble the second tubular segment end portion, must have a longer ejector block, such as the one identified by the reference numeral 368a in Figures 84 and 85, and as shown in FIG. shows in the perspective view of Figure 66, in such a way that the flexible pipe stops at a more shallow depth for the assembly of the second tubular segment end portion of the tightening valve closer to the end of the pipe section flexible than the first tubular segment end portion. The ejector block 368a can be seen in Figure 66, which has a smaller diameter extension 338b, which serves as the actual stop inside the assembly apparatus for the end of the pipe section inserted during the assembly operations. The extension 338b has a diameter smaller than the ejector block 368a in order to leave a circumferential annular space inside the rotary sleeve 149 for the coil spring 363. Referring now to Figure 73, a mode of the apparatus of the invention is illustrated. assemble, together with a flexible clamping valve element 80, and a section 49 of flexible tubing of the same diameter illustrated in a part separated view. The clamping valve member 80, which consists of the first and second shortened tubular segments 82 and 83, as the end portions joined by a short stem portion 84 of approximately the same length as the end portions, is about to assemble telescopically on the section 49 of flexible tubing, near one end thereof. It should be understood that the embodiment of the assembly apparatus shown in Figure 73 is equipped with an ejector block 368 of an appropriate length for positioning the first tubular segment 82 of the tightening valve member 80. In Figure 74 the element is seen of tightening valve 80 balanced to be assembled on the section 49 of flexible tubing, with the rod portion 84 of the tightening valve element bent to one side to keep the second tubular segment end portion 83 out of the way, such so that the first tubular segment end portion 82 can be slid over the extensor finger portions 358 that are retracted close together as a group, as illustrated in Figure 74. In Figure 75, the end portion is shown. of tubular segment 82 slid over the group of extensor finger portions 358. The inner edge of the first tubular segment end portion must be in contact with the ends 37a of the ejector arms 31, in order to ensure accurate positioning during the assembly process, the sectional view of Figure 76 also shows the tubular segment end portion 82 slid over the extensor finger portions 358. In Figure 76 , it is also seen that the apparatus is equipped with a very short ejector block 368 inside the first end 365 of the ejector piston 362. The rotation of the control ring 357, which concentrically surrounds and is joined to the rear end of the larger diameter portion of the rotary sleeve 149, causes rotation of the rotating sleeve, as well as of the disc-shaped member 354 which is mounted on the front end 350 of the rotating shirt. The rotation of the disc-shaped member 354 forces the guide pins 359 attached to the respective leg portions 356 of the extensor finger elements 339, to slide along the spiral guides of the disc-shaped member, giving a cam-type action that moves the leg portions 356 in a radial direction inside the radial channels of the cover plate 347, and consequently, the extensor finger portions 358 of the finger-expander elements 339 move radially as well, which is the desired action. The direction and the degree of rotation of the disc-shaped member 354 determine the radial direction and the degree of movement of the extensor finger portions 358. In the next assembly step, the control ring 357 is then held and rotated. manually, or the lever 361 can be used to rotate the control ring 357, in the proper direction and through a sufficient arc to extend the extensor finger portions 358, thereby stretching the first tubular segment end portion 82. to open, as shown in Figures 77, 78, and 79. By rotating the control ring 357, the tubular segment 82 is sufficiently stretched, enough to admit the end of the pipe section 49, which then slides through of the tubular segment with little or no friction, and on the central guide rod 369, until the end of the pipe section hits the ejector block 368, which serves as a stop for the placement of the tubular segment end portion 82 on the pipe section 49. It is then rotated in control ring 357, by moving the lever 361 back to its initial position, to relax the extension tension on the first portion of the tube. tubular segment end 82, terminating the assembly step for the first tubular segment end portion.

To perform the ejection, the ejector piston 362 moves forward (towards the first surface 345 of the body portion 341) by any suitable element, against the coil spring 363, to move the ejector piston a small distance or separation from a position with the second rear end 364 extending rearwardly beyond the support member 374, until the ejector piston 362 reaches a previously established stop, as seen in Figure 80, where the rear edge 378a of the flattened bottom surface 378 from the back part 364 of the piston is trapped by the upper end with erect flange 377 of the erect leg section 376 of the support element 374. The piston 362 carries forward the ejector block 368 and the ejector arms 371 which contact and eject the in a simultaneous and respective manner, the end of the pipe section 49, and the nearest edge of the placed tubular segment 82 which makes co contact with the ends of the ejector arms 371a as can be seen in Figures 80 and 81. In the previously established stop, the ejector arms 371 and the ejector block 368 will have expelled in a coordinated mechanical manner with a simultaneous pressure, the section 49 of flexible tubing, and the first tubular end portion positioned 82 of the tightening valve element. Although the piston 362 slides easily forward manually towards the cover plate 347, if the coil spring 363 is selected, a suitable spring tension, the piston 362 can be equipped to reciprocate in a hydraulic or electromagnetic manner, if desired . In Figure 82, the partially assembled clamping valve illustrated in Figure 80 is shown, to be further assembled, using a second embodiment of the assembly apparatus, with a different depth stop, ie, more superficial, in the form of a longer ejector block 368a with an extension 338b. The short end section 85 of the flexible pipe section 49 between its front end and the first inserted tubular segment end portion 82 of the tightening valve element 80 has been bent out of the way, so as not to prevent the sliding of the second tubular segment end portion 83 on the retracted extensor finger portions 358 of the assembly apparatus, until the tubular segment end portion contacts the ends of the ejector arms 37la, the rod portion 84 of the valve member being tightening 80 much shorter than the pipe section 85a disposed between the assembled, i.e. positioned, tubular segment end portions 82 and 83. The second end portion is tubular segment 83 of the tightening valve element, slides then on the extensor finger portions 358, and the control ring 357 is rotated to extend the extender finger portions 358, and stretch the second to the tubular segment end portion 83 of the tightening valve member 80, in a manner similar to that seen in Figure 77, and the short end section 85 of the flexible pipe section 49 is sharply bent, and the end front slides inside the extensor finger portions 358, and the second stretched tubular segment end portion 83, and over the center guide rod 369 and up against the ejector block 368a, as shown in FIGS. 83 and 84. As indicated, the longer ejector block 368a having an extension 338b, provides a stop at a more shallow depth of penetration, through the end 85 of the length of pipe 49 inside the apparatus. The ejector block 368a is selected to have an extension 338b of an appropriate length to provide the advance to a selected depth of penetration desired for the end 85 of the pipe section 49, in order to achieve proper placement of the second end portion. of tubular segment 83. To finish the assembly of the second tubular segment end portion 83 of the tightening valve element, the control ring 357 is rotated back to retract the extensor finger portions 358 closer together, to release tension on the second tubular segment end portion 83. To perform the ejection in substantially the same manner as described for the first positioned tubular segment end portion 82, the ejection piston 362 is pressed forward against the action of the coil spring 363, until the rear edge 378a of the flat bottom surface 378 of the rear portion 364 of the piston ejection 362 is stopped by the upper flanged end 377 of the erect leg portion 376 of the support member 374, on which, it will be found that the section 49 of flexible tubing and the second tubular segment end portion 83 of the tightening valve placed on it, they will have been ejected as a unit, and the manufacture of the flexible tightening valve is finished. It is preferred to finish the manufacture of the clamping valve by inserting a small amount of adhesive, such as a silicone adhesive that is vulcanized at room temperature, along the margins of the tubular segment end portions of the element. valve.

Claims

1. A rotating peristaltic pump comprising a housing having: a front body wall with an upper and a lower part, the upper part projecting forward on the lower part; an opening in the lower part of the front body wall, for receiving an engine arrow therethrough, below the protruding upper part of the front body wall; first and second retaining receptacles for receiving the retention elements of a cooperative feeding apparatus formed in the upper part of the front body wall above the opening; and a horizontal guide formed in the upper part of the front body wall, which is connected to and extends from the second holding receptacle to a lateral side of the pump housing.

2. The rotary peristaltic pump of claim 1, further comprising a drive motor mounted inside the pump housing, its arrow extending forward, outwardly through the opening in the body wall, and the rotor mounted peristaltic on the arrow.

3. The rotating peristaltic pump of claim 1, further comprising a drive motor mounted inside the pump housing, the drive motor having an arrow extending forward through the front body wall, with a peristaltic rotor mounted thereon, and wherein the first retention receptacle of the pump housing has a floor, and a substantially vertical guide is formed through the floor and the top of the housing beneath the first retention receptacle, extending a front opening slot for its length, the guide adapting to be substantially aligned with a lateral side of the peristaltic rotor. The rotary peristaltic pump of claim 1, wherein the first receptacle of the housing of the pump has defining walls on three sides, and the drip chamber is provided with a retaining element attached around its upper part, and the retention element is received retentively and supported by the walls and floor of the first retention receptacle. The rotary peristaltic pump of claim 1, further comprising a drive motor mounted inside the pump housing, the drive motor having an arrow extending forward through the front body wall, with a peristaltic rotor mounted thereon, and wherein the second retention receptacle of the pump housing has a floor, and a front opening slot is formed therethrough, extending to the lower part of the body wall, and the slot is adapted to be substantially aligned with a lateral side of this peristaltic rotor. The rotary peristaltic pump of claim 5, wherein the vertical height of both the second receptacle and the horizontal guide of the pump housing, does not exceed about 1.27 centimeters. The rotary peristaltic pump of claim 5, wherein the floor divided by a slot in the pump housing has a front edge, and is formed with an upright flange on the front edge of at least a portion thereof.