Medical infusion device

Abstract

To provide a medical infusion device having a configuration capable of easily cleaning a finger pump.SOLUTION: A medical infusion device according to the present invention includes a drive device (400) configured to drive a finger pump (100), and a transmission mechanism (500) configured to transmit a driving force of the drive device (400) to the finger pump (100), wherein a housing includes a waterproof partition wall (150) configured to partition a first region (A1) accessible from the outside and a second region (A2) inaccessible from the outside in a waterproof state during maintenance of the finger pump (100), the finger pump (100) is disposed in the first region (A1), and the drive device (400) is disposed in the second region (A2).SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] SUMMARY The present disclosure relates to medical infusion devices that include a finger pump for delivering a fluid. [Background technology]

[0002] Medical infusion devices that purify blood through at least one of dialysis and filtration are known. For example, Japanese Patent Application Laid-Open No. 2024-18198 (Patent Document 1), Japanese Patent Application Laid-Open No. 2020-805 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2020-803 (Patent Document 3) disclose medical infusion devices equipped with a finger pump that transports liquid in a tube by pressing the tube with multiple fingers. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2024-18198 [Patent Document 2] Japanese Patent Publication No. 2020-805 [Patent Document 3] Japanese Patent Publication No. 2020-803 Summary of the Invention [Problem to be solved by the invention]

[0004] In a medical infusion device having the above configuration, the medicinal liquid in the tube may inevitably adhere to and stick to the equipment around the tube when the tube is replaced, which may result in the medicinal liquid also sticking to the finger pump, making it necessary to clean the finger pump periodically.

[0005] When cleaning a finger pump, the finger pump is separated from the medical infusion device, but since the medical infusion device does not have sufficient waterproofing measures, cleaning the finger pump requires wiping. Furthermore, the drive unit that remains with the medical infusion device has a complex structure, making it difficult to wipe it thoroughly.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a medical infusion device having a configuration that allows for easy cleaning of the finger pump. [Means for solving the problem]

[0007] [1] A medical infusion device based on the present disclosure is a medical infusion device having a finger pump that delivers liquid from a tube, and includes a housing that accommodates the finger pump, a drive unit that drives the finger pump, and a transmission mechanism that transmits the drive force of the drive unit to the finger pump, wherein the housing has a waterproof partition that separates a first area that is accessible from the outside and a second area that is inaccessible from the outside during maintenance of the finger pump, and the finger pump is located in the first area, and the drive unit is located in the second area.

[0008] [2] The medical infusion device described in [1], wherein the finger pump includes a finger pump unit that contacts the tube and a cam unit that drives the finger pump unit, and the transmission mechanism is connected to the cam unit.

[0009] [3] The medical infusion device described in [2], wherein the cam unit has a cam shaft, one end of the cam shaft protrudes the waterproof partition from the first region to the second region in a waterproof state, and the transmission mechanism is connected to the cam shaft located in the second region.

[0010] [4] The medical infusion device described in [2], wherein the cam unit has a cam shaft, and a first connecting portion is provided on one end side of the cam shaft, and a connecting mechanism provided on the waterproof partition is connected to the first connecting portion, and the connecting mechanism includes a second connecting portion located in the first region and connected to the first connecting portion, and a rotating shaft to which the second connecting portion is connected on one end side and whose other end side is waterproof and protrudes the waterproof partition from the first region to the second region, and to which the transmission mechanism is connected.

[0011] [5] The cam unit has a cam shaft, and a first connecting portion located in the first region is provided on one end side of the cam shaft, and a second connecting portion attached to a rotating shaft to which the transmission mechanism is connected is provided in the second region, and the first connecting portion and the second connecting portion are positioned opposite each other across the waterproof partition, forming a non-contact power transmission mechanism using magnetic force, in the medical infusion device described in [2]. [Effects of the Invention]

[0012] The technique of the present disclosure makes it possible to provide a medical infusion device having a configuration that allows for easy cleaning of the finger pump. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic circuit diagram showing an extracorporeal circulation circuit in a medical infusion device according to a first embodiment. [Figure 2] 1 is a perspective view of the medical infusion device of the first embodiment, viewed from the upper right front side. [Figure 3] 2 is a plan view showing the relative positions of a finger pump and a drive device in a housing according to the first embodiment. FIG. [Figure 4] 2 is a schematic perspective view showing the positional relationship of a finger pump and a waterproof partition wall in a housing according to the first embodiment. FIG. [Figure 5] 10 is a plan view showing the relative positions of a finger pump and a drive device in a housing according to a second embodiment. FIG. [Figure 6] 10 is a diagram showing an engagement relationship between a rotating cam and a finger in the second embodiment. FIG. [Figure 7] FIG. 1 is a first diagram showing a modified example of a transmission mechanism according to another embodiment. [Figure 8] FIG. 2 is a second diagram showing a modified example of the transmission mechanism according to the other embodiment. [Figure 9] FIG. 3 is a third diagram showing a modified example of the transmission mechanism according to the other embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present technology will be described. The same or corresponding parts will be denoted by the same reference characters, and description thereof will not be repeated in some cases.

[0015] In each embodiment described below, when referring to the number, amount, dimensions, etc., the scope of the present technology is not necessarily limited to the number, amount, dimensions, etc., unless otherwise specified. In the following embodiments, each component is not necessarily essential to the present technology, unless otherwise specified. The same reference numerals are used for the same or equivalent parts, and redundant descriptions may not be repeated. It is intended from the beginning that the configurations in the embodiments may be used in appropriate combination.

[0016] In this specification, the terms "comprise," "include," and "have" are open-ended. That is, when a certain configuration is included, other configurations may or may not be included. Furthermore, the present technology is not necessarily limited to those that achieve all of the effects mentioned in the present embodiment.

[0017] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The embodiments described below exemplify a medical infusion device used in continuous renal replacement therapy (CRRT). However, the medical infusion device according to the present embodiment may also be used in any of continuous hemodiafiltration (CHDF), continuous hemofiltration (CHF), continuous hemodialysis (CHD), and slow continuous ultrafiltration (SCUF).

[0018] Furthermore, the technology disclosed below can be applied to other medical infusion devices equipped with finger pumps.

[0019] (Embodiment) Fig. 1 is a schematic circuit diagram showing an extracorporeal circulation circuit in a medical infusion device according to an embodiment. Fig. 2 is a perspective view of the medical infusion device according to the embodiment, seen from the upper right front. The configuration of the medical infusion device 1 according to this embodiment will be described with reference to Figs. 1 and 2.

[0020] In the following description, as shown in FIG. 2, the rearward and forward directions when viewed from the front of the medical infusion device 1 are referred to as the X1 and X2 directions, respectively, and the direction corresponding to the X1 and X2 directions is also referred to as the X-axis direction. Also, as shown in FIG. 2, the rightward and leftward directions when viewed from the front of the medical infusion device 1 are referred to as the Y1 and Y2 directions, respectively, and the direction corresponding to the Y1 and Y2 directions is also referred to as the Y-axis direction. Also, as shown in FIG. 2, the upward and downward directions when viewed from the front of the medical infusion device 1 are referred to as the Z1 and Z2 directions, respectively, and the direction corresponding to the Z1 and Z2 directions is also referred to as the Z-axis direction. Here, the vertical direction corresponds to the Z-axis direction.

[0021] 1 and 2 purifies blood by at least one of dialysis and filtration. The medical infusion device 1 can be used in various locations within a hospital, such as an operating room, an intensive care unit, an emergency room, a patient's room, or a preparation room.

[0022] The medical infusion device 1 includes a housing 10, a blood purifier 20, a blood pump 30, a syringe 40, a plurality of tubes 50, and a finger pump 100.

[0023] The housing 10 has a box-like shape, and inside the housing 10, the blood pump 30, the finger pump 100, control devices, etc. are arranged, and a monitor, etc. is attached to the top surface.

[0024] The blood purifier 20 is used to remove unnecessary or toxic substances from blood, and contains a semipermeable membrane made of, for example, a hollow fiber membrane. In the blood purifier 20, when blood flows inside the hollow fiber membrane, pressure is applied from the inside to the outside of the hollow fiber membrane, causing water, waste products in the blood, and middle-weight substances such as cytokines to move from the inner region to the outer region of the hollow fiber membrane within the blood purifier 20. This is how the blood is purified by the blood purifier 20.

[0025] The blood purifier 20 is attached to the housing 10. A flexible tube 50 is connected to each of the blood inlet and outlet sides of the blood purifier 20.

[0026] As shown in FIG. 1, a blood pump 30 and a syringe 40 are provided on the arterial line of the blood circuit.

[0027] The blood pump 30 circulates blood in the blood circuit and transports the blood to the blood purifier 20. The blood pump 30 may be a roller pump or another type of pump. The operation of the blood pump 30 is controlled by a control device (not shown) provided in the medical infusion device 1.

[0028] The syringe 40 is used to supply an anticoagulant to the blood circuit based on the user's operation in order to prevent blood from clotting in the blood circuit and the blood purifier 20.

[0029] The medical infusion device 1 includes a plurality of tubes 50, which include a first tube 51, a second tube 52, and a third tube 53.

[0030] The first tube 51 is a drainage tube that carries the drainage discharged from the blood purifier 20. One end of the first tube 51 is connected to the blood purifier 20, and the other end is connected to a drainage container 61 that stores the drainage.

[0031] The second tube 52 is a dialysate tube that supplies dialysate to the blood purifier 20. One end of the second tube 52 is connected to a dialysate container 62 that stores dialysate, and the other end is connected to the blood purifier 20.

[0032] The third tube 53 is a replacement fluid tube that supplies replacement fluid to the venous line of the blood circuit. One end of the third tube 53 is connected to a replacement fluid container 63 that stores replacement fluid, and the other end is connected to a heater that heats the replacement fluid. A heater may not be provided, and in that case, the other end is directly connected to the venous line of the blood circuit.

[0033] The plurality of tubes 50 are made of an insulating material such as polyvinyl chloride. The plurality of tubes 50 are flexible. Therefore, when the plurality of tubes 50 are crushed in a direction perpendicular to the direction in which they extend, the flow paths within the tubes 50 are blocked.

[0034] There is no particular limitation on the size of the tube 50. In this embodiment, the tube 50 has an outer diameter of 6 mm or more.

[0035] (Waterproof partition structure inside the housing 10) Next, the waterproof partition structure inside the housing 10 will be described with reference to Figures 3 and 4. Figure 3 is a plan view showing the relative positions of the finger pump 100 and the drive unit 400 inside the housing 10, and Figure 4 is a schematic perspective view showing the relative positions of the finger pump 100 and the waterproof partition 150 inside the housing 10.

[0036] 3, the interior of the housing 10 has a waterproof partition wall 150 that waterproofly separates a first area A1 that is accessible from the outside and a second area A2 that is inaccessible during maintenance of the finger pump 100. Here, the waterproof partition wall 150 refers to a configuration that can prevent moisture from entering the first area A1 to the second area A2. For example, in the present embodiment, the first area A1 has a box-like shape with no gaps, but the first area A1 is not limited to this shape and may have any configuration that can prevent moisture from entering the second area A2 from the first area A1.

[0037] The second area A2 is where devices that need to be protected from moisture adhesion and fixation are placed, such as the stepping motor as the drive device 400, control devices, control boards, and other electronic devices.

[0038] A finger pump 100 is disposed in the first area A1. The finger pump 100 includes a finger pump unit 110 that contacts the tube 50, and a cam unit 120 that drives the finger pump unit 110. The cam unit 120 is connected to a transmission mechanism 500 that transmits the driving force of the drive device 400.

[0039] In the finger pump 100, a plurality of rotating cams 120c with different rotational phases provided on a cam unit 120 abut against a plurality of fingers 110f provided on a finger pump unit 110. The plurality of fingers 110f sequentially reciprocate while changing their phases, thereby discharging liquid in the tube 50 abutting against the fingers 110f in a predetermined direction. The rotational motion of the rotating cam 120c, which will be described later, is converted into linear reciprocating motion of the fingers 110f.

[0040] The cam unit 120 has a cam shaft 130 that rotatably supports multiple rotating cams 120c. The multiple rotating cams 120c are fixed to the cam shaft 130 located in the first region A1, and one end of the cam shaft 130 projects, in a waterproof state, from the first region A1 to the second region A2 through the waterproof partition wall 150.

[0041] Both ends of the camshaft 130 are rotatably supported by bearings 140 provided in the waterproof bulkhead 150. A seal member 160 such as an O-ring is attached to the camshaft 130 that passes through the waterproof bulkhead 150 to ensure liquid-tightness. The seal member 160 is not limited to an O-ring, and a V-ring may also be used, or any other seal member that has the function of preventing dust, dirt, moisture, or a mixture thereof from entering the second area A2.

[0042] A transmission mechanism 500 is connected to the camshaft 130 located in the second area A2. The transmission mechanism 500 includes a timing belt 510 wound around the rotary shaft 410 of the drive unit 400, and a pulley 520 fixed to the camshaft 130 protruding into the second area A2 and around which the timing belt 510 is wound.

[0043] (Actions and Effects) According to the medical infusion device 1 having the above configuration, when cleaning the finger pump 100, the finger pump 100 is located in the first area A1, and the drive unit 400 and other electronic devices are located in the second area A2 separated by the waterproof partition 150. As a result, the finger pump 100 can be easily cleaned using water without worrying about water adhering to the electronic devices. At this time, the first area A1 and the second area A2 are maintained in a liquid-tight state by the waterproof partition 150, so cleaning solutions and the like do not infiltrate into the second area A2. As a result, the medical infusion device 1 can be maintained in a highly hygienic state.

[0044] (Embodiment 2: Other waterproof bulkhead structures) Next, other waterproof partition structures within the housing 10 will be described with reference to Figures 5 and 6. Figure 5 is a plan view showing the relative positions of the finger pump 100 and the drive unit 400 within the housing 10, and Figure 6 is a diagram showing the engagement relationship between the rotating cam 120c and the finger 110f.

[0045] 5, the medical infusion device 1 of this embodiment has the same configuration as the above-described medical infusion device 1, but differs in the following respects. A finger pump 100 is housed in a case 100A, with a finger pump unit 110 and a cam unit 120 integrated together. Both ends of a cam shaft 130 are axially supported by bearings 140 provided in the case 100A.

[0046] A first gear 210 (first connecting portion) is provided on one cam shaft 130 protruding from the case 100A. A connecting mechanism 600 provided on the waterproof bulkhead 150 is connected to the first gear 210.

[0047] The connecting mechanism 600 includes a second gear 610 (second connecting portion) located in the first area A1 and meshing with the first gear 210, and a rotating shaft 620 having one end connected to the second gear 610 and the other end waterproof, protruding the waterproof partition wall 150 from the first area A1 to the second area A2, and connected to the transmission mechanism 500. A pulley 520 constituting the transmission mechanism 500 is attached to the rotating shaft 620. The first gear 210 is connected to the second gear 610 (in the direction of arrow F in the figure), so that the driving force of the drive unit 400 is transmitted to the finger pump 100.

[0048] Cylindrical gears are used as the first gear 210 and the second gear 610, and a spur gear mechanism is adopted. The rotating shaft 620 is axially supported by a bearing 140 provided in the waterproof bulkhead 150, and a sealing member 160 such as an O-ring is attached to ensure liquid-tightness.

[0049] The case 100A containing the finger pump 100 employs a mechanism (not shown) that allows selection between a state in which the case 100A is attached to the housing 10 and a driving state in which the first gear 210 and the second gear 610 are meshed is maintained, and a state in which the case 100A is removed from the housing 10.

[0050] Referring to Figure 6, in the finger pump 100, the engagement relationship between the rotating cam 120c and the finger 110f is such that the rotating cam 120c rotates within the recess 110g provided in the finger 110f, and the rotational motion of the rotating cam 120c is converted into the reciprocating motion of the finger 110f (in the direction of the arrow S indicated by N in the figure).

[0051] (Actions and Effects) The medical infusion device 1 having the above configuration can achieve the same functions and effects as those of embodiment 1. Furthermore, since the finger pump 100 is configured to be removable from the housing 10 by the case 100A, the finger pump 100 can be removed from the medical infusion device 1 and only the finger pump 100 can be easily cleaned.

[0052] (Other embodiments) Modified examples of the coupling mechanism will be described with reference to Figures 7 to 9. Figures 7 to 9 are Figures 1 to 3 showing transmission mechanisms with other configurations. The above-mentioned coupling mechanism 600 employs a spur gear mechanism that uses a first gear 210 as the first coupling part and a second gear 610 as the second coupling part.

[0053] By using a spur gear mechanism, the tooth trace is straight, which reduces energy loss and achieves high transmission efficiency.Furthermore, the design is simple, and manufacturing and installation are easy.

[0054] In the connection mechanism 600A shown in FIG. 7, a first gear 210A (worm wheel) is used as the first connection part, and a second gear 610A (worm) is used as the second connection part, and a screw gear mechanism is employed.

[0055] By using a screw gear mechanism, the gears have a high meshing ratio and the tooth surfaces are stronger than those of a spur gear mechanism. Furthermore, the smooth meshing reduces noise and vibration.

[0056] In the connecting mechanism 600B shown in FIG. 8, a first gear 210B (bevel gear) is used as the first connecting portion, and a second gear 610B (bevel gear) is used as the second connecting portion, and a straight bevel gear mechanism is employed.

[0057] By using a straight bevel gear mechanism, the direction of rotation can be changed by 90 degrees, which can lead to the downsizing of the device depending on the layout.

[0058] In the connecting mechanism 600C shown in FIG. 9, a first magnetic coupling 210C (secondary side) is used as the first connecting part, and a second magnetic coupling 610C (primary side) is used as the second connecting part, and a non-contact power transmission mechanism using magnetic force is adopted.

[0059] When this non-contact power transmission mechanism is adopted, the first magnetic coupling 210C is located in the first area A1, and the second magnetic coupling 610C is located in the second area A2, and the first magnetic coupling 210C and the second magnetic coupling 610C are positioned opposite each other with the waterproof partition wall 150 in between, thereby forming a non-contact power transmission mechanism using magnetic force.

[0060] The non-contact power transmission mechanism is suitable for bulkhead transmission, and enables a configuration that does not require a seal structure for the shaft that penetrates the waterproof bulkhead 150. Furthermore, it is easy to attach, detach, and center, and can exhibit a torque limiter function (step-out in the event of overload).

[0061] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0062] 1 Medical infusion device, 10 Housing, 20 Blood purifier, 30 Blood pump, 40 Syringe, 50 Tube, 51 First tube, 52 Second tube, 53 Third tube, 61 Drainage container, 62 Dialysis fluid container, 63 Substitute fluid container, 100 Finger pump, 100A Case, 110 Finger pump unit, 110f Finger, 120 Cam unit, 120c Rotating cam, 130 Cam shaft, 140 Bearing, 150 Waterproof partition, 160 Sealing member, 210, 210A, 210B First gear, 210C First magnetic coupling, 400 Drive unit, 410, 620 Rotating shaft, 500, 500A, 500B, 500C Transmission mechanism, 510 Timing belt, 520 Pulley, 600 Coupling mechanism, 610, 610A, 610B second gear, 610C second magnetic coupling.

Claims

1. A medical infusion device having a finger pump that delivers liquid from a tube, a housing that houses the finger pump; a driving device for driving the finger pump; a transmission mechanism that transmits the driving force of the drive device to the finger pump; Equipped with the housing has a waterproof partition that separates a first area accessible from the outside and a second area inaccessible from the outside during maintenance of the finger pump, in a waterproof state; the finger pump is disposed in the first region, and the drive device is disposed in the second region; Medical infusion device.

2. the finger pump includes a finger pump unit that contacts the tube and a cam unit that drives the finger pump unit; The transmission mechanism is connected to the cam unit.

10. The medical infusion device of claim 1.

3. The cam unit has a cam shaft, One end side of the camshaft projects the waterproof partition wall from the first region to the second region in a waterproof state, The transmission mechanism is connected to the camshaft located in the second region.

3. The medical infusion device of claim 2.

4. The cam unit has a cam shaft, A first connecting portion is provided on one end side of the camshaft, A connection mechanism provided on the waterproof bulkhead is connected to the first connection portion, the connecting mechanism includes a second connecting portion located in the first region and connected to the first connecting portion, and a rotating shaft having one end connected to the second connecting portion and the other end in a waterproof state, the rotating shaft protruding the waterproof bulkhead from the first region to the second region and connected to the transmission mechanism.

3. The medical infusion device of claim 2.

5. The cam unit has a cam shaft, a first connecting portion located in the first region is provided on one end side of the camshaft, the second region has a second coupling portion attached to a rotation shaft to which the transmission mechanism is coupled, The first connecting portion and the second connecting portion are positioned opposite each other across the waterproof bulkhead to form a non-contact power transmission mechanism using magnetic force.

3. The medical infusion device of claim 2.

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