US3738381A

US3738381A - Inverted fluid collection receptacle

Info

Publication number: US3738381A
Application number: US00098566A
Authority: US
Inventors: Le Grand Holbrook
Original assignee: MEDICAL DEV CORP
Current assignee: MEDICAL DEV CORP
Priority date: 1970-12-16
Filing date: 1970-12-16
Publication date: 1973-06-12
Anticipated expiration: 1990-06-12
Also published as: CA991935A; GB1363273A; FR2118435A5

Abstract

Reduced gaseous pressure operated, liquid receptacle structure having an enclosure member and a bottom cover. The latter is provided with an interior sealing protuberance which seals against the inner wall of the enclosure member, such seal being increased upon the application of reduced pressure of the interior of the structure. A one-piece, fixed differential valve device is disposed in a vacuum port of the enclosure member to permit the passage of air therethrough, but not the passage of liquids such as blood. The port containing the valve device is tapered or otherwise configured such that the valve will not be drawn toward the reduced pressure source. The enclosure member is constructed to have ports at its base or top such that pin means and corresponding guide apertures in the mold structure forming the enclosure may be accommodated, so as to preserve uniform wall thickness in the enclosure member during the formation thereof.

Description

United States Patent [1 1 Holbrook INVERTED FLUID COLLECTION RECEPTACLE [75] Inventor: LeGrand K. Holbrook, Salt Lake City, Utah [73] Assignee: Medical Development Corporation,

Salt Lake City, Utah [22] Filed: Dec. 16, 1970 [21] Appl. No.: 98,566

[ June 12, 1973 Primary Examiner-Alan Cohan Att0rneyM. Ralph Shaffer [57] ABSTRACT Reduced gaseous pressure operated, liquid receptacle structure having an enclosure member and a bottom cover. The latter is provided with an interior sealing protuberance which seals against the inner wall of the enclosure member, such seal being increased upon the application of reduced pressure of the interior of the structure. A one-piece, fixed differential valve device is disposed in a vacuum port of the enclosure member to permit the passage of air therethrough, but not the passage of liquids such as blood. The port containing the valve device is tapered or otherwise configured such that the valve will not be drawn toward the reduced pressure source. The enclosure member is constructed to have ports at its base or top such that pin means and corresponding guide apertures in the mold structure forming the enclosure may be accommodated, so as to preserve uniform wall thickness in the enclosure member during the formation thereof.

1 Claim, 6 Drawing Figures PATENTED Jim INVENTOR. Legrand K .Holbrook His Ahorney INVERTED FLUID COLLECTION RECEPTACLE The present invention relates to vacuum-operated receptacles, for drawing into the enclosure formed thereby, liquid such as blood or body fluid from a hospital patient, by way of example. More particularly, the present invention provides a new and useful enclosure structure wherein uniformity of wall thickness is assured during fabrication of such structure, differential valve means is provided to permit the passage of air through the structures vacuum port but prevents the passage of liquid therethrough, and wherein optimum sealing is assured relative to the enclosure member of the structure and its cover.

The present invention solves a number of problems in connection with cup configured containers, in general, and objects known as vacuum bottles for hospital use, in particular. A first consideration, of course, in connection with any vacuum operated device, is to preserve uniformity of wall thickness in the device. This avoids chances of collapse or breakage of the containers at weakened wall areas where non-uniformity in wall thickness exists. As a general rule, for currently produced, cup-configured devices the male or positive mold used in fabricating the device frequently becomes off-center or askew relative to the female or negative mold. Conventional cup-configured objects do not have holes in their bottoms or bases. The present invention reverses this general approach by in fact providing ports in the base, termed the top in the specification hereinafter, of such a container device. The ports are preferably made elongate so as to project on opposite sides of the base or top formation. Such port inclusion permits the pins forming the interior wall of the ports to serve also as guide pines for cooperable guide apertures disposed in the female or negative mold used in fabricating the device. In this way, continuous centerline positioning of the male mold relative to the female mold is assured by virtue of the pins and cooperating guide apertures associated proximate the port area of the container. This avoids the difficulty of the male mold being misaligned, either initially or through the use, off-center or askew relative to the central axis of the negative mold employed in fabricating the device.

A second difficulty in connection with previously engineered vacuum operated devices in a simple way of preventing liquid entering the container from proceeding directly to the pressure reducing equipment, i.e. the vacuum pump, when the container fills or becomes nearly filled. In the present invention a differential valve device is provided, in the nature of a perforate plug, which admits the passage of air but prevents blood or other liquids or anticipated viscosity from passing therethrough.

As to another difficulty solved by the invention, prior devices have utilized a container covered by a top. The user must rely constantly upon the effective vacuum seal created between the top and the upper lip of the container. In the present invention the structure is inverted, wherein the top is now the base of the structure, thus requiring a vacuum seal only for that portion of time required to introduce drawn liquid into the container (to drop downwardly onto the cover area).

Regardless of where the sealing member is located, however, the same in the present invention is shown to include an interior, annular, sealing protuberance which norm ally assumes a draft angle, in part, relative to the interior wall of the container; when a vacuum is applied, the protuberance is completely disposed against the inner wall to seal the same, so as to increase the effective seal of the cover relative to the enclosure member.

Accordingly, a principal object of the present invention is to provide a new and improved, liquid fillable container,

An additional object is to provide a new and improved vacuum operated enclosure structure.

An additional object is to provide a vacuum operated enclosure structure having an enclosure member and cover cooperably sealed together in an effective manner.

An additional object is to provide a vacuum operated enclosure structure having an inverted, cup-configured enclosure member provided with a bottom cover adequately sealed thereto.

An additional object is to provide enclosure structure having an inverted, cup-configured enclosure member provided with plural ports, liquid and vacuum, upstanding from the top of the enclosure member.

A further object is to provide a vacuum operated enclosure structure having a vacuum port having a differential valve device which will be a one-piece fixed unit, mounted and constructed in such a way that only gaseous substances such as air will pass therethrough, but that liquids to be deposited in such container will not pass the valve.

A further object is to provide a vacuum operated enclosure member which is fabricated in a manner to insure uniformity in wall thickness thereof, this by guide pins passing through the base of the enclosure structure during fabrication thereof.

The features of the present invention which are believed to be novel are set forth with particularity in the appended claims.

The present invention, both as to its organization and manner of operation, together with further object and advantages thereof, may best be understood by reference to the following description, taken in connection with the accompanying drawing in which:

FIG. 1 in a perspective view of an enclosure member constructed in accordance with the present invention.

FIG. 2 is an enlarged fragmentary vertical section taken along the line 2-2 in FIG. 1, illustrating the deposition of a valve device within the vacuum port of the enclosure structure.

FIG. 3 is a horizontal cross-section taken along the line 3-3 in FIG. 2.

FIG. 4A is an enlarged framentary vertical section of a portion of the enclosure structure of FIG. 1, illustrating the cooperation of the bottom cover with the lip of the enclosure member of the structure before a reduced pressure condition is caused to exist within the enclosure.

FIG. 4B illustrates the structure of FIG. 4A once a reduced pressure condition is produced within the enclosure member of the invention.

FIG. 5 is a longitudinal, vertical section of molding structure which can be used in forming the enclosure member of the containerstructure of the invention.

In FIG. 1 the receptacle device 10 of the present invention is shown to include an enclosure member 11- having side wall 12 and a top 13 integral therewith. The

latter is provided with a series of ports, identified as vacuum port 14, fluid inlet port 15, and a tandem connection port 16. These ports are parallel to each other and to the longitudinal axis x of the enclosure member. Port 16 may be capped by a cap 17 when not in use. Provision of the tandem connection port 16 is to accommodate external valving or external tandem connections when plural ones of the receptacles are to be connected together in tandem to and between a vacuum-or reduced air-pressure producing source, i.e.

a vacuum pump, and a source of fluid'supply.

The enclosure member 11 is also shown in FIG. 4A to include a lip 18 defining an open base E and being provided with an outwardly extending annular bead F. The lip 18 cooperates with an interior receiving groove 19 associated with the liquid sealing bottom cover 20.

Bottom cover 20 is shown to include a bottom portion 21 which is preferably slightly concave in its nominal configuration. A rim portion 22 is contiguous with bottom portion 21 in the manner illustrated in FIGS. 4A and 4B.

Integrally formed with bottom portion 21 of bottom cover 20 is an interiorly protruding, annularly disposed sealing portion 23. The same has an outside, preferably conically formed surface 24 of which portion H is a sloped continuation, in the manner shown by the dotted line, before the bottom cover 20 is snapped onto the lip of enclosure member 11. Enclosure member 11 is composed of harder material, e. g. acrylic polystyrene SAN, than the medium density polyethylene preferably comprising bottom cover 20. Thus, when the bottom cover 20 is snapped onto enclosure member 11, portion H of sealing portion 23 will be compressed inwardly such that there will exist a compression sealing juncture 1, existing even before a vacuum is applied. Once a reduced pressure condition is produced within the enclosure, then upper portion K of sealing portion 23 will also be disposed against the inner side wall surface 25. See FIG. 4B.

In sum, when the bottom cover 20 is snapped onto the lip of the enclosure member 11, a seal will exist from point B1 to B2. When a vacuum is applied, the bottom cover 20 will tend to become drawn inwardly relative to the enclosure member, in a manner indicated in FIG. 4B, so that the upper portion at K of sealing surface 24 will also engage the inner wall 25 of enclosure member II, to point C. When, because of the applied vacuum, liquid enters via port 15, by way of example, the liquid will fall onto the bottom cover 20 so that there will be a slight tendency of the bottom cover to return downwardly to re-open the angle A. However, the common juncture seal from J to point B1 will contmue.

There shall next be considered the inclusion of a differential valve device 26 in those ports, such as vacuum port 14, which are to be utilized as vacuum ports, that is, to be connected to a reduced gaseous pressure source such as a vacuum pump. In the embodiment shown the device 26 is simply a perforate plug, cylindrical in form, see FIG. 3, and is pressed into the interior 26 of the lower extension 28 of vacuum port 14.

The device takes the form of a styrofoam plug which is perforated by a series of small holes 27 Where the fluid to be introduced in the container device 10 is blood or blood containing body fluids, then the holes 27 should be of such a size that they will fit or can be produced by, say, a 20 gauge needle. A series of closely spaced needles may be easily used in a die to punch simultaneously the holes 27' in the plug or valve device.

Of importance in FIG. 2 is the fact that the interior 27A of the vacuum port 14 is tapered. This is for a first purpose of providing a constriction for the valve device or plug 26 such that the same will not proceed into, let alone out of, the vacuum port 14 toward the vacuum producing source. Additionally, the tapered interior 27A provides for uniform wall thickness at D and a tapered exterior at 28, which exterior can accommodate either an elastomeric vacuum conduit tube 29 or some other conduit device provided with a Leur fitting.

As to the construction shown in FIG. 2, it will be observed that when a vacuum is applied as by conduit 29, fluid to be drawn into enclosure member 11 will proceed through the fluid inlet port 15 and into the enclosure G as defined by enclosure member 11 and the liquid sealing bottom cover 20. Parenthetically, it is to be observed that the bottom cover 20, preferably made of a medium density polyethylene, will be sufficient to produce quite an effective vacuum seal at the juncture 19, and most certainly will be effective for fluid once the same is contained therewithin. The strength of the bottom cover should be such that the weight of the fluid will not tend to depress significantly the configuration of bottom cover 20 from that condition shown in FIG. 48.

FIG. 5 indicates a method of fabrication of enclosure member 11, whereby to insure that the wall thickness at 30 of enclosure member 11 is preserved. One prior method of making cup-configured enclosures is simply to provide positive and negative molds, with a positive mold being disposed within the negative mold to form the space defining the cupconfiguration. Normally, such misalignments as may occur between the positive and negative molds are not objectionable since uniformity of wall thickness is not critical. In the case of vacuum operated containers, however, it is essential in order to preserve the configuration against collapse of a portion of the wall, due to non-uniformity of wall thickness, that the positive and negative molds be maintained strictly on centerline during the injection molding process associated with fabrication of the container.

It is noted that all of the design features of the enclosure member 11 in combination with bottom cover 20 co-act together to great advantage. FIG. 5 illustrates that positive and

negative molds

31 and 32 are respectively provided with mold members 33 and 34. These are suitably configured, as shown in FIG. 5, to form the enclosure member as well as the ports. Note that since the ports, e. g. 14 and 16, are included the same can be formed by

pins

35 and 36. But these are also used as guide pins which proceed into corresponding guide apertures 37 and 38, respectively; hence, the cooperation of the pins and guide apertures 35-38 assure that the positive mold 31 will be maintained on centerline with respect to the negative mold 32, thereby insuring the uniformity of wall thickness 30 relative to enclosure member 11. Accordingly, there is assured the condition of uniformity of wall thickness so that a chancing of collapse of the container at any weakened area, weakened because of an inadvertently produced reduced wall thickness, is avoided.

The bottom cover 20, in being disposed at the bottom rather than at the top of the container, insures that a vacuum seal need be produced only for a limited time, that is, for the time required to introduce fluid into the container. Once liquid is at the bottom of the container, then a vacuum seal, strictly speaking, is not required. However, it must be noted that an extremely effective seal for all fluids is produced by virtue of the interconnection between bottom cover and enclosure member 11. Especially is this true in the case of the provision of annular protrusion 23 which acts as an effective seal against the interior wall of enclosure member 11, when a vacuum is applied, so as to draw upwardly the central portion of bottom portion 21 relative to the remainder of the closure structure. The ports 14-16, in being provided the top (or base portion) 13, serve ideally not only as conduit connections but also to accommodate

pins

35 and 36, which pins assure uniformity in wall thickness relative to wall of the enclosure member 11. Liquid plastic feed stock, of course, will be introduced via feed conduit 39 which is connected by threads or otherwise at 40 to the negative mold 32.

Accordingly, it is seen that the present invention has provided vacuum operable liquid enclosure structure which is ideally suited for the collection of liquids such as a patients body fluid in a hospital. Special note is to be made that the differential valve device 26 is simply fixed, involves no moving parts, and serves as a block to liquid such as blood, whereas the small holes 27' in FIG. 3 permit the interior of the container or enclosure member 11 to be evacuated as before described.

As to enclosure-lid seal, it is seen that the seal is maximized when a vacuum seal is needed, that is, when the reduced pressure is initially applied to facilitate the drawing up of fluid for disposition within the container. Once the fluid or liquid drops into the container so as to cover the bottom, then so great a seal need not be continued. Hence, it is permissible for the weight of the liquid to restore to some degree the configuration of the bottom cover 20.

Should the receptacle construction be inverted, such that the ports are a part of the cover 20, then bottom portion 21 will simply be considered a central portion of the cover 20.

While particular embodiments of the present invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from this invention in its broader aspects, and, therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of this invention.

I claim:

1. Reduced-air-pressure operated liquid receptacle structure, including, in combination, a liquid receiving enclosure structure provided with a liquid receiving port and an elongate vacuum port, and differential valve means comprising a plastic, longitudinally perforate, elongate plug disposed within said vacuum port for preventing the passage of liquid therethrough but for allowing air to be evacuated from within said enclosure to pass therethrough, and wherein said vacuum port frictionally retentively engages said plug and is tapered outwardly, the outwardly tapered condition of said port preventing the movement of said plug toward an external vacuum producing source to be connected to said vacuum port.