CN104324432B

CN104324432B - Infusion pump comprising anti-misloading device

Info

Publication number: CN104324432B
Application number: CN201310308656.5A
Authority: CN
Inventors: 林彰焱; 姚念龙; 孙国杰; H·朱; 干晶; 林军; 林彰忠
Original assignee: Baxter Medical Supplies Co Ltd; Baxter International Inc
Current assignee: Baxter Medical Supplies Co Ltd; Baxter International Inc
Priority date: 2013-07-22
Filing date: 2013-07-22
Publication date: 2020-03-24
Anticipated expiration: 2033-07-22
Also published as: HK1206290A1; CN104324432A

Abstract

The application relates to an infusion pump including prevent mistake and carry device, wherein the pump has: a housing defining a slot for receiving a slide clamp; and a door movably connected to the housing and movable between an open position and a closed position. A locking pin is movably connected to the housing and configured to engage a slide clamp of the feeder device. The locking pin is movable between a locking position engaging the slide clamp in the slot and a releasing position disengaging the slide clamp. The locking pin moves to a locking position and secures the slide clamp in the slot portion when the door moves to the open position, and moves to a release position and releases the slide clamp from the slot portion when the door moves to the closed position. The pump also includes a feeding set misload sensor.

Description

Infusion pump comprising anti-misloading device

Technical Field

The present invention relates to a system for preventing misloading of an infusion system, and more particularly to such a system comprising an anti-misloading device enabling a feeding set to be correctly connected to an infusion pump.

Background

Infusion systems deliver fluids, including nutrients and medications, to a patient. Such systems include pumps programmed to supply these fluids to the patient in predetermined metered amounts and at specified time intervals. Errors in the delivery of fluid through an infusion system can be caused by a number of reasons, including misloading or misconnecting the delivery device to the system. These problems can lead to over-or under-transfusions, missed treatments, or delayed treatments to the patient, which can significantly affect the patient's health and recovery. Therefore, guidelines have been established to enhance the safety of infusion systems.

Clinicians typically perform several safety checks (such as "line management" or "line tracing") to help eliminate misconnections or misloads. Especially as the complexity of the overall infusion system of a patient increases, establishing such an infusion system and a detailed connection management procedure adds a time burden to the clinician and is prone to errors. That is, multiple administration devices, medications, nodes, access ports, pump channels in an infusion system increase the amount of time required to perform a safety check of the infusion system and also introduce additional opportunities for error.

Accordingly, there is a need for a system that assists a feeding device in being properly connected to a fluid administration system while reducing human error.

Disclosure of Invention

The present infusion pump includes an anti-misload device that guides the feeding device to be properly connected to the infusion pump while helping to minimize human error.

In an embodiment, an infusion pump for delivering fluid through a feeding device having a sliding clamp is provided, wherein the pump comprises: a housing defining a slot portion configured to receive a slide clamp; and a door movably connected to the housing, wherein the door is movable between an open position and a closed position. A locking pin is movably connected to the housing and configured to engage the slide clamp. The locking pin is movable between a locking position, in which the locking pin engages the slide clamp and secures the slide clamp in the slot, and a releasing position, in which the locking pin is disengaged from the slide clamp. In operation, when the door is moved to the open position, the locking pin moves to the locked position and secures the slide clamp in the channel portion, and when the door is moved to the closed position, the locking pin moves to the release position and releases the slide clamp from the channel portion.

In another embodiment, an infusion pump for delivering fluid through a conduit of a feeding set is provided, wherein the pump includes a housing and a pumping mechanism mounted to the housing. The pumping mechanism comprises: a plurality of pumping fingers, a motor for sequentially, reciprocally moving the plurality of pumping fingers, and a sensor configured to detect the catheter when the catheter is properly mounted on the pumping mechanism. The sensor causes the motor to stop rotating when the sensor detects no catheter mounted on the pumping mechanism.

Drawings

Fig. 1 is a perspective view illustrating an infusion pump according to an embodiment of the present application;

FIG. 2 is a perspective view of the infusion pump of FIG. 1 showing the door in an open position;

fig. 3 is a perspective view illustrating an embodiment of a feeding device connected to the infusion pump of fig. 1;

FIG. 4 is a partial perspective view showing a conduit of the feeding device of FIG. 3 passing through and gripped by a slide clamp of the infusion pump of FIG. 1;

FIG. 5 is a cross-sectional view of the infusion pump of FIG. 1 taken generally along line 5-5;

FIG. 6 is an enlarged perspective view of an embodiment of a clip securing mechanism installed in the infusion pump of FIG. 1;

FIG. 7 is an enlarged partial top view of the clamp securing mechanism of FIG. 6 with the locking pin in the release position;

FIG. 8 is an enlarged partial top view of the clip securing mechanism of FIG. 6 with the locking pin in the locked position;

FIG. 9 is a partial front view of a pumping mechanism of the infusion pump of FIG. 1;

FIG. 10 shows a partial front view of the pumping mechanism of FIG. 9 without a portion of the conduit of the feeding device contacting the pumping mechanism of FIG. 9;

FIG. 11 is a partial cross-sectional view of the pumping mechanism of FIG. 9 taken generally along line 11-11, showing the sensor in a first position; and is

FIG. 12 is a partial cross-sectional view of the pumping mechanism of FIG. 9 taken generally along line 11-11, showing the sensor in a second position.

Detailed Description

Referring to fig. 1-8, an infusion delivery system including an infusion pump 50 is used to deliver a fluid (such as a medication or nutrient) to a patient at predetermined amounts and at regular intervals. The infusion pump 50 may be a small portable pump or a larger pump, such as the infusion pump disclosed in U.S. patent No.5,018,945, which is incorporated herein by reference. As shown in fig. 1, the infusion pump 50 includes a housing 52, a door 54 pivotally connected to the housing, and an input device such as a display 56 and keypad 58 on the door. The display 56 and keypad 58 are used to program the infusion pump and, more particularly, a processor 60 in the pump for setting fluid delivery amounts and time intervals, which in turn is in communication with a pumping mechanism 62.

Fluid flows to and from the infusion pump 50 through the fluid feed device 64 as shown in fig. 3. The feeder device 64 is attached to the pump 50 by routing a portion of the conduit 66 of the feeder device 64 between the door 54 and the housing 52. Preferably, the feeding device 64 comprises: a drip chamber 68 directly connected to a fluid container (not shown), such as an intravenous fluid bag; a sliding clamp 70 for clamping a portion of the conduit 66 and controlling the flow of fluid through the conduit; a roller clamp 72, which is also used to control the flow of fluid; a Y-joint 74; and a luer lock or luer slip 76 at one end of the feeding set 64 where the luer lock is connected to a cannula inserted into the patient to deliver fluid to the patient. A portion of the feeder conduit 66, and more specifically the portion of the conduit 66 between the slide clamp 70 and the roller clamp 72, is inserted into a channel 78 defined by the housing 52 and disposed above the pumping mechanism 62. As described below, pumping mechanism 62 includes a set of reciprocating pumping fingers 80 that contact catheter 66 to control the amount of fluid delivered to the patient.

During administration of fluid to a patient, it is vital to prevent free flow of fluid to the patient. Free flow occurs when unrestricted fluid flow to the patient is permitted, resulting in excess fluid being supplied to the patient, i.e., over-infusion. To assist in preventing free flow of fluid through the feeder device 64, a sliding clamp 70 is attached to the conduit 66 of the feeder device. As shown in fig. 4, the slide clamp 70 includes a body 82 having a central opening 84 with a wide portion 86 and a narrow portion 88. The conduit 66 is moved into the narrowed portion 88 of the slide clamp opening 84 to clamp or restrain the conduit and prevent free flow of fluid through the conduit. This is particularly critical where the feeding set 64 is inserted or otherwise attached to the infusion pump 50 to deliver fluid to the patient. Specifically, during initial setting of the infusion pump 50, the door 54 moves from the closed position shown in fig. 1 and 5 to the open position shown in fig. 2. When door 54 is in the open position, fluid flow through conduit 66 is not controlled by infusion pump 50 and thus fluid can flow freely through the conduit. Thus, if the portion of conduit 66 in narrow portion 88 of opening 84 were to inadvertently move into wide portion 86 during initial set-up of pump 50 or at any other time door 54 is in the open position, then free flow of fluid would occur.

To assist in preventing inadvertent or accidental free flow of fluid through the conduit 66 to the patient, the present infusion pump 50 has a free flow prevention feature. Specifically, the housing 52 includes a slot portion 90 configured to receive the slide clamp 70 as shown in FIG. 2. The slide clamp 70 is inserted into the slot portion 90 such that the portion of the conduit 66 passing through the slide clamp is prevented by the housing 52 from moving or sliding downward into the wide portion 86 of the opening 84. To ensure that the slide clamp 70 remains in the slot portion 90 when the door 54 is in the open position, the infusion pump 50 includes a clamp-locking mechanism 92 that secures and locks the slide clamp 70 to the housing 52 until the door 54 is moved to the closed position.

Referring to fig. 5-6, the clamp locking mechanism 92 includes a frame 94 formed by opposing side walls 96 and a rear wall 98, wherein each side wall includes a rear flange 100 that is connected to the rear wall 98 by suitable fasteners. Similarly, each side wall 96 includes a

front flange

102a, 102b, respectively, wherein the front flange 102a is secured to an inner surface of the housing 52 and the front flange 102b is connected to a securing member 104 by suitable fasteners. The front flange 102b also includes a plurality of frame bars 106 that fit within corresponding apertures (not shown) defined by the housing 52 for securing the frame 94 in place.

The stationary member 104 includes a housing 108 having an upper end 110 and a lower end 112 and defining a channel 114 configured to receive an L-shaped door locking member 116 movably connected to the housing 52. The door locking member 116 has a first wall 118 and a second, generally planar wall 120 transverse to the first wall. The second wall 120 defines a plurality of openings 122 including a first locking opening 124a and a second locking opening 124 b. Each of the first and

second locking openings

124a, 124b includes an

upper portion

126a, 126b having a first radius of curvature and a semi-circular

lower portion

128a, 128b having a second radius of curvature. As shown in fig. 6, the first wall 118 of the door locking member 116 is positioned adjacent the upper end of the housing 52 and the bottom end 130 of the second wall 120 is positioned at the opposite end of the housing 52. A rod 132 is movably connected to the bottom end 130, and a biasing member, such as a coil spring 134, is placed on or around the rod 132 between the bottom end of the housing and the door latch member 116 to bias the door latch member away from the bottom end of the housing 52 and toward the upper end of the housing.

Referring to fig. 2, 5 and 6, the clip receivers 136 are mounted to the upper end of the housing 52 by inserting fasteners through opposing securing holes 138 and into corresponding fastener receptacles 140 on the housing. The clip receiver 136 includes a slot portion 90 configured to receive the slide clip 70 and includes an engagement member 142 movably connected to the receiver 136. The slide jig 70 is inserted into the groove portion 90 and contacts the engagement member 142. Continued downward force or pressure on the slide clamp 70 causes the engagement member 142 to press downwardly on the door locking member 116 against the force of the spring 134 to move the door locking member downwardly within the housing 52, respectively, until the upper portions of the first and

second locking openings

126a, 126b are aligned with the respective apertures 144 defined by the housing 52.

When the

upper portions

126a, 126b of the first and

second locking openings

124a, 124b are aligned with the respective holes 144, the sliding clamp 70 is secured and locked in place by the U-shaped clamp locking member 146. The clamp locking member 146 includes a flat arm 148 having opposite ends, wherein a first end 150 of the arm includes a forwardly extending contact pin 152 and a rearwardly extending support rod 154 and is movably connected to a pin housing 156 and a second end 158 includes a locking pin 160. To enable the clip locking member 146 to move or slide relative to the pin housing 156, the pin housing 156 defines an interior channel 162 and a pin slot portion 168 extending between a front opening 164 and a rear opening 166. As shown in fig. 7, a biasing member, such as a coil spring 170, is positioned on the support bar 154 between the arm 148 and the inner surface of the pin housing 156 to bias the arm and thus the contact pin 152 and the locking pin 160 toward the front of the housing 52. A portion of the support rod 154 extends through the rear opening 166 to enable the clamp locking member 146 to move or slide relative to the pin housing 156 while preventing the spring 170 from disengaging from the support rod 154.

The locking pin 160 is sized and shaped to correspond to the size and shape of the pin opening 172 defined by the clip receiver 136, wherein the locking pin 160 passes through the pin opening and the wide portion 86 of the slide clip opening 84 when the clip locking member 146 is in the first or deactivated position as shown in FIG. 8 to lock the slide clip 70 in place. Alternatively, the locking pin 160 is disengaged from the slide clamp opening 84 when the clamp locking member 146 is in the second or compressed position as shown in fig. 7.

The door 54 of the infusion pump 50 includes a pair of vertically spaced latch and actuation pins 174, 176, respectively, extending from an interior surface 178 of the door. Each latch pin 174 includes a rod 180 having a diameter and a radius of curvature and a generally tapered head 182 at one end of the rod, where the head is sized or of a larger diameter than the diameter of the rod. When the door 54 is moved to the closed position against the front surface of the housing (fig. 5), the latch pin 174, and more particularly the head 182, is configured to extend through the aperture 144 in the housing 52 and the respective first and

second locking openings

124a, 124b of the door locking member 116. At the same time, the actuating pin 176 extends through the opening 184 on the housing 52 and contacts the contact pin 152 of the clamp locking member 146. As the actuating pin 176 moves inwardly, it pushes or moves the contact pin 152, and thus the support rod 154, inwardly against the spring 170. The locking pins 160 interconnected with the contact pins via the arms 148 are simultaneously moved inwardly and disengaged from the slide clamp 70. Releasing the slide clamp 70 from the clamp locking member 146 causes the spring 170 to expand and push the door locking member 116 upward within the housing 52. Thus, the first and

second locking openings

124a, 124b on the door locking member 116 move upward relative to the latch pin 174 until the latch pin seats against the door locking member at the lower portion 128 of the openings. Because the diameter of the head 182 of the latch pin 174 is greater than the diameter or radius of curvature of the lower portion 128 of the

openings

124a, 124b, the door 54 is locked in the closed position because the latch pin cannot move through the opening in the door lock member 116. Locking the door 54 of the infusion pump 50 when the slide clamp 70 is removed from the slot portion 90 may help prevent inadvertent or accidental free flow of fluid through the feeding set to the patient that may occur when the door 54 is in the open position and the feeding set conduit 66 is temporarily disengaged from the pump.

To open the door 54 of the infusion pump 50, such as to pass the conduit 66 of the feeding set 64 through the pump, adjust the position of the conduit 66 within the pump 50, or connect a new feeding set to the pump, the user would insert the sliding clamp 70 associated with the feeding set 64 as described above into the slot portion 90. Slide clamp 70 is pushed downward within slot portion 90 by the user, thereby causing door locking member 116 to move downward against spring 134 and move upper portions 126 of first and

second locking openings

124a, 124b to abut head portion 182 of latch pin 174. This allows the latch pin 174 to move back through the first and

second locking openings

124a, 124b and be released from the door locking member 116, thereby releasing the door 54. At the same time, when the wide portion 86 of the clip opening 84 is aligned with the pin opening 172 in the clip receiver 136, the locking pin 160 is biased by the spring 170 through the pin opening and the wide portion 86 of the slide clip opening 84. The locking pin 160 thereby locks the slide clamp 70 in the clamp receiver 136 while the door 54 is in the open position. Locking the sliding clamp 70 prevents it from being removed from the housing 52, where the conduit 66 may accidentally move to the wide portion 86 of the opening 84, allowing fluid to flow freely to the patient.

Referring now to fig. 2 and 9-12, as described above, the feeding set 64 is loaded into the infusion pump 50 by substantially aligning the portion of the catheter 66 between the slide clamp 70 and the roller clamp 72 along the pumping fingers 80 of the pumping mechanism 79 shown in fig. 2 and 9. Pumping finger 80 independently and reciprocally moves into and out of contact with the feeder device conduit 66 based on a predetermined or programmed pumping sequence to deliver a specified volume of fluid (such as a medication or nutrient) to the patient. If the conduit 66 of the feeding set 64 is misloaded such that all or a portion of the conduit 66 is not sufficiently positioned on the pumping finger 80 as shown in FIG. 10, free flow may occur, potentially resulting in excessive fluid delivery to the patient, which may affect the patient's health or rehabilitation; or the administration of the infusion may be inaccurate, or fail to meet the needs of the patient, or cause injury to the patient.

Referring to fig. 9, one of the pumping fingers 80, and preferably the central pumping finger 80b, is replaced by a misload sensor 190. It should be understood that one or more of the pumping fingers 80 may be replaced by one or more mis-load sensors 190. Each misload sensor 190 detects whether the conduit 66 is present above the pumping finger 80, and more specifically, the misload sensor 190, and triggers or sounds an alarm 61, such as an audio indicator, visual indicator, tactile indicator, or any combination of these or other prompt, when the conduit 66 is misloaded as shown in fig. 10. The infusion pump 50, and more specifically the processor 60 in the infusion pump, is also programmed to prevent or stop operation of the infusion pump in the event of an error load on the feeding set tubing 66. It should be understood that the sensor 190 may, for example, trigger an alarm, or prevent or stop operation of the infusion pump, or trigger an alarm and prevent operation of the infusion pump as described above. It should also be understood that the one or more sensors 190 may be any suitable sensor or sensors for detecting the presence of an object (such as conduit 66) on or near the sensor or sensors.

With particular reference to fig. 11 and 12, a cam 194 is associated with the pumping finger 80 and is connected to a motor 196 that rotates the cam. Rotation of the cam 194 causes different steps of the cam to contact the respective pumping fingers 80 to move them reciprocally relative to the conduit 66 based on the programmed fluid delivery volume and time interval. As shown in fig. 11, the mis-load sensor 190 has a body 198 that includes a guide 200 formed by opposing shoulders 202 that define a channel 204 for positioning and holding the conduit 66 in place relative to the pumping mechanism 79. It should be understood that the guide 200 may be flat, semi-circular, or any suitable size or shape. The body 198 also includes an opposing stem 206 surrounded by a corresponding biasing member, such as a coil spring 208. A coil spring 208 is positioned between the misload sensor 190 and the housing 52 and biases the sensor outwardly toward the front of the housing. An arm 210 is integrally formed with and extends from the sensor body 198 and includes a magnet 212. It should be understood that the magnet 212 may be any suitable magnet or magnets. To determine the position of the misload sensor 190, the pumping mechanism 79 includes a hall circuit 214 that generates a signal that is transmitted to the processor 60, where the signal strength is based on the relative position of the hall circuit 214 to the magnet 212. For example, when the conduit 66 of the feeding set 64 is properly loaded on the pumping mechanism 79, i.e., in the sensor guide 200 (fig. 11), the sensor 190 is pressed inward by the conduit against the spring 208, which increases the distance between the magnet 212 and the hall circuit 214 to a distance "D1". When conduit 66 is misloaded, i.e., not positioned in guide 200 and thus not on pumping mechanism 79 (fig. 12), misload sensor 190 is not pressed inward, and thus magnet 212 and hall circuit 214 are maintained at an initial or deactivated distance "D2" relative to each other. Thus, when the distance between magnet 212 and hall circuit 214 is at distance D1, processor 60 in infusion pump 50 receives a signal from misload sensor 190 and activates an alarm, such as an audio alarm or indicator, a visual indicator, and/or a tactile alarm or indicator, to alert the user to the misloading of feeding set 64. Processor 60 may also be programmed to shut down motor 196 when a misload of feeder device 64 occurs.

The present infusion pump 50 includes an anti-misloading device that assists in preventing free flow of fluid (such as medication) to the patient and prevents misloading of the administration device to the pump. All of these anti-misloading devices of the present infusion pump enable a user to properly set the infusion pump and deliver fluid to a patient while minimizing human error.

While the principles of the present infusion pump have been described above with reference to specific drawings and applications, it should be understood that this description is by way of example only and not as a limitation as to the scope of the claims which follow.

Claims

1. An infusion pump for delivering fluid through a conduit of a feeding device connected to the infusion pump, the infusion pump comprising:

a housing;

a door movably connected to the housing; and

a pumping mechanism mounted to the housing, the pumping mechanism comprising a plurality of pumping fingers, a motor for sequentially and reciprocally moving the plurality of pumping fingers, and a sensor configured to detect a conduit of the feeding device when the conduit is properly mounted on the pumping mechanism;

wherein the conduit is disposed between the sensor and the inner surface of the door when the conduit is properly installed on the pumping mechanism;

the pumping mechanism comprises a hall circuit and the sensor comprises a magnet, the sensor is movable between a first position with a conduit not mounted on the pumping mechanism and a second position with a conduit properly mounted on the pumping mechanism, the hall circuit and the sensor are separated by a first distance with the sensor in the first position and a second distance with the sensor in the second position, the sensor activates at least one of: triggering an alarm and preventing operation of the pumping mechanism.

2. The infusion pump of claim 1, wherein said pumping mechanism comprises a plurality of sensors each configured to detect a catheter.

3. The infusion pump of claim 1, wherein said sensor causes said motor to stop rotating if said sensor does not detect that said catheter is mounted on said pumping mechanism.

4. The infusion pump of claim 1, wherein said sensor comprises a biasing member configured to bias said sensor to said first position.

5. The infusion pump of claim 1, wherein said sensor comprises a plurality of biasing members each configured to bias said sensor to said first position.

6. The infusion pump of claim 1, wherein said alarm comprises one of an audio indicator, a visual indicator, or a tactile indicator.

7. The infusion pump of claim 1, wherein said sensor has a body including a guide formed by opposing shoulders defining a channel for positioning and holding said catheter in place relative to said pumping mechanism.

8. The infusion pump of claim 7, wherein said magnet is disposed on an arm extending from said body of said sensor.

9. The infusion pump of claim 1, wherein the feeding set has a slide clamp for controlling the flow of fluid through the feeding set, the infusion pump comprising:

a slot defined by the housing, the slot configured to receive a slide clamp; and

a locking pin movably connected to the housing and configured to engage the slide clamp, the locking pin movable between a locked position engaging and securing the slide clamp in the slot and a released position disengaging the slide clamp,

wherein the door is movable between an open position and a closed position, the locking pin moving to the locked position and securing the slide clamp in the slot with the door moving to the open position, and the locking pin moving to the release position and releasing the slide clamp from the slot with the door moving to the closed position.

10. The infusion pump according to claim 9, further comprising a clamp locking member movably connected to the housing and including the locking pin, the clamp locking member further comprising a contact pin configured to engage the door if the door is moved to the closed position and disengage from the door if the door is in the open position, wherein the clamp locking member is moved to the release position if the contact pin engages the door and is moved to the locked position if the contact pin disengages from the door.

11. The infusion pump of claim 10, wherein said door includes an actuating pin configured to engage said contact pin if said door is in said closed position and disengage said contact pin if said door is in said open position.

12. The infusion pump of claim 9, further comprising a door locking member mounted in said housing and configured to lock said door if said locking pin is moved to said release position and to release said door if said locking pin is moved to said locking position.

13. The infusion pump of claim 12, wherein said door locking member includes an opening and said door includes a latch pin configured to pass through said opening, said latch pin passing through said opening and being secured by said door locking member with said locking pin moved to said release position, and said latch pin being released from said opening with said locking pin moved to said locking position.

14. The infusion pump of claim 12, wherein said door locking member comprises two openings and said door comprises two latch pins, each configured to pass through a respective one of said two openings, said latch pins passing through said respective openings and being secured by said door locking member with said locking pin moved to said release position, and said latch pins being released from said openings with said locking pin moved to said locking position.

15. The infusion pump of claim 9, further comprising a door locking member movably mounted in the housing, a first end of the door locking member abutting the slot, and a second end of the door locking member including a biasing member configured to bias the door locking member toward the slot, wherein with a sliding clamp inserted into the slot, the sliding clamp contacts the first end and presses the door locking member against the biasing member, and with the sliding clamp released from the slot, the door locking member is biased toward the slot.

16. The infusion pump of claim 15, wherein said door lock member includes a pair of openings and said door includes a pair of latch pins each configured to pass through a respective one of said pair of openings, said latch pins passing through and being secured by said door lock member with said door lock member biased toward said slot portion, and said latch pins being released from said door lock member with said door lock member pressed against said biasing member by a slide clamp.