Medical infusion devices

Abstract

To provide a medical transfusion apparatus improved in reliability in operation by suppressing accumulation of electric charge.SOLUTION: A medical transfusion apparatus includes an insulative tube 50 and a finger pump 100. The finger pump 100 has a pump unit including an insulative finger, a support frame 140 and a cover. The cover is positioned so as to catch the tube 50 between the fingers in a closed state, and is positioned so as not to catch the tube in an open state. The cover includes a conductive contact part 112t brought into contact with the tube 50 in a closed state, and a conductive first contact part 112s conducted thereto, and the support frame 140 includes a conductive second contact part 140s. The medical transfusion apparatus is so constructed that the first contact part 112s and the second contact part 140s are brought into contact with each other at least in a closed state so that electric charge accumulated due to that the finger presses the tube 50 is statically eliminated toward the support frame 140 side.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a medical infusion device that includes a finger pump for transporting a liquid. [Background technology]

[0002] Conventionally, medical infusion devices that purify blood by at least one of dialysis and filtration have been known. For example, Japanese Patent Application Laid-Open No. 2020-805 (Patent Document 1) discloses a medical infusion device 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 Publication No. 2020-805 Summary of the Invention [Problem to be solved by the invention]

[0004] The fingers and tubes used in finger pumps are generally made of insulating materials. The support frame that supports the fingers and the plate-like member that sandwiches the tubes together with the fingers are themselves made of conductive metal, but their surfaces are often coated with an insulating film as an anti-rust treatment.

[0005] Therefore, when the finger repeatedly presses the tube, electric charges tend to accumulate in the tube. Such accumulated electric charges may cause dielectric breakdown in unintended parts of the device, and in some cases, may short-circuit the electronic board that controls the finger pump, which is located near the tube, and may result in malfunction of the finger pump and the medical infusion device equipped with it.

[0006] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a medical infusion device that improves operational reliability by suppressing the accumulation of electric charge. [Means for solving the problem]

[0007] The medical infusion device according to the present invention includes an insulating tube and a finger pump for transporting liquid in the tube. The finger pump includes a pump unit including a plurality of insulating fingers, a support frame supporting the pump unit, and a cover switchable between an open state and a closed state. The fingers are arranged side by side along the extension direction of the tube so that each can press the tube in a direction perpendicular to the extension direction of the tube. The cover is positioned opposite the fingers so that the tube can be sandwiched between the fingers in the closed state. The cover is positioned so that the tube cannot be sandwiched between the fingers in the open state. The cover has a conductive abutment that abuts the tube in the closed state and a conductive first contact that is electrically connected to the abutment. The support frame has a conductive second contact. In the medical infusion device based on the present invention, the first contact and the second contact are configured to be in contact at least in the closed state so that the electric charge accumulated on the tube when pressed by the multiple fingers is discharged toward the support frame. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a medical infusion device that is designed to improve operational reliability by suppressing charge accumulation. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic circuit diagram showing an extracorporeal circulation circuit in a medical infusion device according to an embodiment. [Figure 2] 1 is a perspective view of a medical infusion device according to an embodiment, viewed from the upper right front side. [Figure 3] FIG. 3 is a left side view of the medical infusion device shown in FIG. 2. [Figure 4] FIG. 4 is a perspective view of the finger pump shown in FIG. 3 with the cover closed. [Figure 5] FIG. 4 is a perspective view of the finger pump shown in FIG. 3 with the cover open. [Figure 6] FIG. 5 is a schematic front view of the finger pump shown in FIG. 4. [Figure 7] FIG. 7 is a schematic cross-sectional view of the finger pump shown in FIG. 6. [Figure 8] FIG. 5 is an enlarged side view of a main part of the finger pump shown in FIG. [Figure 9] 8 is a perspective view for explaining a contact state between the plate-like member and the support frame shown in FIG. 7. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments shown below exemplify a medical infusion device used in continuous renal replacement therapy (CRRT). However, the medical infusion device according to this embodiment may also be used in any of continuous hemodiafiltration (CHDF), continuous hemofiltration (CHF), continuous hemodialysis (CHD), and slow continuous ultrafiltration (SCUF). In the embodiments shown below, identical or common parts are designated by the same reference numerals in the drawings, and their description will not be repeated.

[0011] (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. First, the configuration of a medical infusion device 1 according to this embodiment will be described with reference to Figs. 1 and 2.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] The housing 10 has a box-like shape and includes a front surface 10a on which the blood pump 30 is attached, a right side surface, a left side surface 10b (see Figure 3 described below) on which the finger pump 100 is attached, a back surface, and a curved top surface on which a monitor, etc. is attached.

[0016] 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.

[0017] 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.

[0018] As shown in FIG. 1, a blood pump 30 and a syringe 40 are provided on the arterial line of the blood circuit.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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. Note that the heater may not be provided, and in that case, the other end is directly connected to the venous line of the blood circuit.

[0025] The plurality of tubes 50 are made of an insulating material such as polyvinyl chloride. The plurality of tubes 50 are also 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.

[0026] 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.

[0027] Fig. 3 is a left side view of the medical infusion device shown in Fig. 2. Fig. 4 is a perspective view of the finger pump shown in Fig. 3 with the cover closed. Fig. 5 is a perspective view of the finger pump shown in Fig. 3 with the cover open. Fig. 6 is a schematic front view of the finger pump shown in Fig. 4. Fig. 7 is a schematic cross-sectional view of the finger pump taken along line VII-VII in Fig. 6. Next, the configuration of a finger pump 100 according to this embodiment will be described with reference to Figs. 3 to 7.

[0028] Of the configuration of the finger pump 100 according to this embodiment, the portion near the tube 50 when the cover 110 is in the closed state will be described in detail later.

[0029] 6, in order to make it possible to understand by referring to Fig. 6 the correspondence between the support frame 140 and the plurality of pump units 120, which will be described later, and the tubes 50 when the cover 110 is closed, the portions of the plurality of support frames 140, the pump units 120, and the tubes 50 that are not directly visible because they are covered by the cover 110 are shown schematically through the cover 110. In addition, in Figs. 6 and 7, the outline of the tubes 50 is indicated by a two-dot chain line.

[0030] As shown in Figure 3, the finger pump 100 is attached to the housing 10 of the medical infusion device 1 when in use. In this embodiment, the finger pump 100 is attached to the left side surface 10b of the housing 10. The finger pump 100 is used to transport liquid in the tube 50 attached thereto.

[0031] As shown in Figures 3 to 7, the finger pump 100 has a cover 110, a plurality of pump units 120 that sandwich the tube 50 together with the cover 110 in a closed state, a drive mechanism 130 that drives the plurality of pump units 120, and a support frame 140 that supports the plurality of pump units 120.

[0032] 4 and 5, cover 110 has hinge portion 115 (described later) attached to the lower end of support frame 140, so that cover 110 is rotatably supported by support frame 140. This allows cover 110 to be switched between a closed state and an open state.

[0033] Here, the closed state of the cover 110 means that, as shown in FIG. 4, the cover 110 is positioned opposite a plurality of fingers 120a (see FIG. 5) described below so that the tube 50 can be clamped between the cover 110 and each of the plurality of fingers 120a.

[0034] The open state of the cover 110 refers to a state in which the cover 110 is positioned so that the tube 50 cannot be pinched between the cover 110 and each of the fingers 120a, as shown in Fig. 5. When the cover 110 is in the open state, the tube 50 can be attached to and detached from the finger pump 100.

[0035] As shown in Figures 4, 5 and 7, the cover 110 has a holder 111, a plurality of plate-shaped members 112, a plurality of elastic members 113 interposed between the holder 111 and the plurality of plate-shaped members 112, a lever 114, and a hinge portion 115.

[0036] 4 and 5, the holder 111 has a flat, substantially rectangular parallelepiped outer shape. The holder 111 holds a plurality of plate-like members 112 and covers a plurality of pump units 120 in the closed state.

[0037] The material of holder 111 is not particularly limited, and may be made of, for example, a metal material such as aluminum, or a resin.

[0038] As shown in FIGS. 5 and 7, the plurality of plate-like members 112 are attached to the main surface of the holder 111 on the side facing the tube 50 in the closed state.

[0039] More specifically, the cover 110 includes a first plate-shaped member 112a, a second plate-shaped member 112b, and a third plate-shaped member 112c that are aligned along the Z-axis direction in the closed state as a plurality of plate-shaped members 112. These plurality of plate-shaped members 112 are attached to the holder 111 with bolts or the like.

[0040] In the closed state, the first plate-shaped member 112a is disposed in a position facing the first pump unit 121, which will be described later. Similarly, in the closed state, the second plate-shaped member 112b is disposed in a position facing the second pump unit 122, and the third plate-shaped member 112c is disposed in a position facing the third pump unit 123.

[0041] This allows the first plate-shaped member 112a to sandwich the first tube 51 together with the first pump unit 121. Similarly, the second plate-shaped member 112b can sandwich the second tube 52 together with the second pump unit 122, and the third plate-shaped member 112c can sandwich the third tube 53 together with the third pump unit 123.

[0042] The plurality of plate-like members 112 are configured so that the entire surface thereof is conductive. Examples of surfaces that are entirely conductive include those that have undergone an anti-rust treatment in which a conductive coating is formed on the surface of a metal, and more specifically, those in which an alodine treatment or a nickel-chrome plating treatment has been applied to the surface of aluminum, and those in which a hard chrome plating treatment has been applied to the surface of iron. In this embodiment, the plurality of plate-like members 112 are made of aluminum whose surfaces have been subjected to a nickel-chrome plating treatment. This makes it possible to make the surfaces of the plurality of plate-like members 112 conductive while also applying an anti-rust treatment to the surfaces of the plurality of plate-like members 112.

[0043] These multiple plate-like members 112 include a conductive abutment portion 112t that abuts against the tube 50 and a conductive first contact 112s that is electrically connected to the abutment portion 112t, details of which will be described later.

[0044] 7, two elastic members 113 are interposed between the holder 111 and the first plate-shaped member 112a. Similarly, two elastic members 113 are interposed between the holder 111 and the second plate-shaped member 112b, and two elastic members 113 are interposed between the holder 111 and the third plate-shaped member 112c.

[0045] The elastic member 113 elastically biases the first plate-shaped member 112a in a direction away from the holder 111. As a result, the first plate-shaped member 112a is pressed toward the first tube 51 in the closed state, and as a result, the first plate-shaped member 112a is pressed against the support frame 140.

[0046] The elastic member 113 is configured by, for example, a plate spring made of metal or the like, a coil spring, or the like, but is preferably configured by a coiled wave spring that can obtain a large elastic force with a short stroke.

[0047] By configuring the elastic member 113 with a coiled wave spring, the size of the elastic member 113 in the expansion and contraction direction (i.e., the thickness direction of the cover 110) is reduced. As a result, the cover 110 is made thinner, which reduces the weight of the cover 110, thereby improving the operability of the finger pump 100.

[0048] The number of elastic members 113 interposed between holder 111 and first plate-shaped member 112a is not particularly limited to two, and may be one, or may be three or more. The same applies to the number of elastic members 113 interposed between holder 111 and second plate-shaped member 112b, and the number of elastic members 113 interposed between holder 111 and third plate-shaped member 112c.

[0049] 4 and 5, lever 114 is rotatably fixed to holder 111 and has a generally U-shaped overall configuration. Lever 114 includes grip portion 114a and two protrusions 114b. Protrusions 114b are located at the end of lever 114 that is fixed to holder 111. Lever 114 is used to switch cover 110 between an open state and a closed state.

[0050] To switch the cover 110 from the open state to the closed state, the user first rotates the holder 111 so as to press the holder 111 toward the support frame 140. Next, the user grasps the grip 114a and pushes down the lever 114. This causes the protrusion 114b to be inserted into a receiving portion provided on the support frame 140 and to be locked by a pin or the like (not shown) of the receiving portion. As a result, the cover 110 is switched from the open state to the closed state.

[0051] To switch cover 110 from the closed state to the open state, the user first grasps grip portion 114a and pushes up lever 114. This releases protrusion 114b from engaging with the receiving portion. Next, the user pulls grip portion 114a or holder 111 toward the user, thereby rotating holder 111 in a direction away from support frame 140. This completes the switch of cover 110 from the closed state to the open state.

[0052] 5, hinge portion 115 is located at the lower end of holder 111. Hinge portion 115 is attached to the lower end side of support frame 140, thereby connecting cover 110 and support frame 140.

[0053] As shown in FIGS. 5 to 7, the finger pump 100 includes a first pump unit 121, a second pump unit 122, and a third pump unit 123 as the plurality of pump units 120.

[0054] Each of the plurality of pump units 120 includes a plurality of fingers 120a arranged side by side along the X-axis direction, which is the extension direction of the tube 50 attached thereto. This enables each of the plurality of fingers 120a to press the tube 50 in the Y-axis direction, which is a direction perpendicular to the extension direction of the tube 50. In the present embodiment, each of the plurality of pump units 120 includes five fingers 120a1, 120a2, 120a3, 120a4, and 120a5 as the plurality of fingers 120a.

[0055] 7, the finger 120a includes a convex portion 120ac that protrudes toward the tube 50. The material of the finger 120a is not particularly limited. In this embodiment, the finger 120a is made of an insulating material such as plastic.

[0056] The first pump unit 121 is a drainage pump, and is used to send the drainage of the dialysate that has migrated to the outer region of the hollow fiber membrane in the blood purifier 20 to the drainage container 61. More specifically, the first pump unit 121 transports the drainage flowing through the conduit of the first tube 51 attached thereto from the blood purifier 20 side toward the drainage container 61 side (i.e., toward the X2 direction in Figures 4 to 7).

[0057] The second pump unit 122 is a dialysate pump and is used to supply the dialysate stored in the dialysate container 62 to the blood circuit. More specifically, the second pump unit 122 transports the dialysate flowing through the conduit of the second tube 52 attached thereto from the dialysate container 62 side toward the blood purifier 20 side (i.e., toward the X1 direction in FIGS. 4 to 7).

[0058] The third pump unit 123 is a substitution fluid pump, and is used to supply the substitution fluid stored in the substitution fluid container 63 to the blood circuit. More specifically, the third pump unit 123 transports the substitution fluid flowing through the conduit of the third tube 53 attached thereto from the substitution fluid container 63 side toward the heater or the venous line side (i.e., toward the X1 direction in Figures 4 to 7).

[0059] Each of the plurality of pump units 120 can operate independently. In this embodiment, the operation of these units is controlled by the control device that controls the operation of the blood pump 30 described above.

[0060] Although there are no particular limitations on the arrangement of the multiple pump units 120, it is preferable that they are arranged in a line from the viewpoint of ease of operation for the user of the medical infusion device 1. In this embodiment, the multiple pump units 120 are arranged in the Z direction, which is the vertical direction, in the order of first pump unit 121, second pump unit 122, and third pump unit 123 from the Z1 direction side to the Z2 direction side.

[0061] 4, 5, and 7, a drive mechanism 130 that drives the plurality of pump units 120 is disposed on the opposite side of the plurality of pump units 120 from the side on which the cover 110 is located in the closed state. The drive mechanism 130 is housed in the housing 10 of the medical infusion device 1 when the finger pump 100 is attached to the housing 10.

[0062] The drive mechanism 130 includes a first drive mechanism 131 that drives the first pump unit 121, a second drive mechanism that drives the second pump unit 122, a third drive mechanism that drives the third pump unit 123, and a casing 132 that houses these. The first drive mechanism 131, the second drive mechanism, and the third drive mechanism are configured to be able to operate independently of each other.

[0063] As shown in FIG. 7, the first drive mechanism 131 includes a plurality of shafts 131a, a plurality of eccentric cam rollers 131b, a rotary shaft 131c, a drive belt 131d, a drive shaft 131e, and a stepping motor 131f.

[0064] More specifically, the first drive mechanism 131 has multiple shafts 131a, including shaft 131a1 corresponding to finger 120a1 of the first pump unit 121 described above, shaft 131a2 corresponding to finger 120a2, shaft 131a3 corresponding to finger 120a3, shaft 131a4 corresponding to finger 120a4, and shaft 131a5 corresponding to finger 120a5.

[0065] The first drive mechanism 131 has multiple eccentric cam rollers 131b, including an eccentric cam roller 131b1 corresponding to shaft 131a1, an eccentric cam roller 131b2 corresponding to shaft 131a2, an eccentric cam roller 131b3 corresponding to shaft 131a3, an eccentric cam roller 131b4 corresponding to shaft 131a4, and an eccentric cam roller 131b5 corresponding to shaft 131a5.

[0066] One end of the shaft 131a1 is connected to the corresponding finger 120a1, and the other end is in contact with the corresponding eccentric cam roller 131b so as to be periodically pressed by the eccentric cam roller 131b. The same is true for the shafts 131a2, 131a3, 131a4, and 131a5.

[0067] A drive belt 131d is wound between the drive shaft 131e of the stepping motor 131f and the rotary shaft 131c. The rotational driving force generated by driving the stepping motor 131f is transmitted to the rotary shaft 131c via the drive belt 131d, thereby driving the rotary shaft 131c to rotate.

[0068] The five eccentric cam rollers 131b1, 131b2, 131b3, 131b4, and 131b5 are attached to a single rotating shaft 131c with their rotational phases shifted by a predetermined angle from one another, thereby enabling the five fingers 120a to press the first tube 51 at different timings.

[0069] By using the first drive mechanism 131 configured in this manner, it becomes possible to transport the liquid in the first tube 51 in a pulsating manner by sequentially moving the multiple fingers 120a1, 120a2, 120a3, 120a4, and 120a5 of the first pump unit 121.

[0070] The second drive mechanism and the third drive mechanism are configured in the same manner as the first drive mechanism 131 described above.

[0071] 4 to 7, the support frame 140 has a generally rectangular plate shape when viewed from the front. The support frame 140 has a plurality of window portions 141 formed by through holes, a plurality of recessed portions 142, and a plurality of tube gripping portions 143.

[0072] 5 and 6, the support frame 140 includes a first window portion 141a, a second window portion 141b, and a third window portion 141c arranged side by side along the Z-axis direction as a plurality of window portions 141. The shape of each of the plurality of window portions 141 in a front view is configured to be substantially the same as the outer shape of the pump unit 120 when viewed from above.

[0073] The first window 141a has a first pump unit 121 inserted therethrough. Similarly, the second window 141b has a second pump unit 122 inserted therethrough, and the third window 141c has a third pump unit 123 inserted therethrough.

[0074] As a result, the window portions 141 can support the pump units 120 and expose them toward the tubes 50. The number of window portions 141 is not particularly limited to three, but can be changed appropriately to correspond to the number of pump units 120. The portions of the surface of the support frame 140 adjacent to the plurality of window portions 141 are defined by window frame members 141d made of a resin material (see the colored portions in FIG. 6).

[0075] The support frame 140 includes a plurality of recesses 142, which include a pair of first recesses 142a, a pair of second recesses 142b, and a pair of third recesses 142c.

[0076] The pair of first recessed portions 142a are positioned to sandwich the first window portion 141a in the X-axis direction. The pair of second recessed portions 142b are positioned to sandwich the second window portion 141b in the X-axis direction. The pair of third recessed portions 142c are positioned to sandwich the third window portion 141c in the X-axis direction.

[0077] Each of the multiple recessed portions 142 is configured in a roughly C-shape that opens toward the tube 50 when viewed along the X-axis direction. As a result, the pair of first recessed portions 142a surround the first tube 51 without contacting it. Similarly, the pair of second recessed portions 142b surround the second tube 52 without contacting it, and the pair of third recessed portions 142c surround the third tube 53 without contacting it.

[0078] The support frame 140 includes a plurality of tube gripping portions 143, which include a pair of first tube gripping portions 143a, a pair of second tube gripping portions 143b, and a pair of third tube gripping portions 143c.

[0079] One of the pair of first tube gripping portions 143a is located outside one of the pair of first recessed portions 142a in the X-axis direction, and the other is located outside the other of the pair of first recessed portions 142a in the X-axis direction.

[0080] Similarly, one of the pair of second tube gripping portions 143b is located outside one of the pair of second recessed portions 142b in the X-axis direction, and the other is located outside the other of the pair of second recessed portions 142b in the X-axis direction. One of the pair of third tube gripping portions 143c is located outside one of the pair of third recessed portions 142c in the X-axis direction, and the other is located outside the other of the pair of third recessed portions 142c in the X-axis direction.

[0081] Each of the multiple tube gripping portions 143 is configured in a roughly C-shape that opens toward the tube 50 when viewed along the X-axis direction. This allows the pair of first tube gripping portions 143a to grip the first tube 51 removably in a direction perpendicular to the extension direction of the first tube 51 (i.e., in the Y-axis direction). The same is true for the pair of second tube gripping portions 143b and the pair of third tube gripping portions 143c.

[0082] The entire surface of the support frame 140, excluding the window frame member 141d, is conductive. Examples of entirely conductive surfaces include those that have undergone rust prevention treatment, in which a conductive coating is formed on the surface of a metal. More specifically, examples include aluminum surfaces that have undergone alodine treatment or nickel chrome plating, and iron surfaces that have undergone hard chrome plating. In this embodiment, the support frame 140 is made of aluminum whose entire surface has been nickel chrome plated. This allows the entire surface of the support frame 140, excluding the window frame member 141d, to be rust-proofed while also being conductive.

[0083] The support frame 140 further has a conductive second contact 140s that contacts the first contact 112s of the plate-shaped member 112 at least when the cover 110 is in the closed state, as will be described in more detail later.

[0084] Fig. 8 is an enlarged side view of a main part of the finger pump shown in Fig. 4. Fig. 9 is a perspective view for explaining the contact state between the plate-like member and the support frame shown in Fig. 7. Next, with reference to Figs. 8 and 9 and the above-mentioned Fig. 7, a portion of the configuration of the finger pump 100 according to this embodiment, near the tube 50 in the closed state, will be described.

[0085] Here, in Figure 9, in order to make it easier to understand the contact state between the plate-shaped member 112 and the support frame 140 in the closed state, only the plate-shaped member 112 of the cover 110 is shown, and the remaining parts are not shown.

[0086] Of the multiple tubes 50, the first plate-shaped member 112a and the first pump unit 121 located near the first tube 51, the second plate-shaped member 112b and the second pump unit 122 located near the second tube 52, and the third plate-shaped member 112c and the third pump unit 123 located near the third tube 53 all have the same configuration.

[0087] Therefore, in the following, the first tube 51, the second tube 52 and the third tube 53 will be referred to as tubes 50 without distinguishing between them, the first plate-shaped member 112a, the second plate-shaped member 112b and the third plate-shaped member 112c will be referred to as plate-shaped members 112 without distinguishing between them, and the first pump unit 121, the second pump unit 122 and the third pump unit 123 will be referred to as pump units 120 without distinguishing between them.

[0088] 8 and 9, in the closed state, part of the surface of the plate-shaped member 112 is pressed against the support frame 140. More specifically, the plate-shaped member 112 is elastically biased by the above-mentioned elastic member 113 (see FIG. 7), and thereby comes into contact with the support frame 140. The contact portions are located at both ends of the plate-shaped member 112 in the X-axis direction.

[0089] In this way, the plate-like member 112 is pressed against the support frame 140, whereby the plate-like member 112 is positioned relative to the support frame 140 in the Y-axis direction.

[0090] 7 to 9, the plate-like member 112 has, on a portion of its surface, a conductive contact portion 112t that contacts the tube 50 (the light-colored portion in FIG. 9 corresponds to the contact portion 112t). The tube 50 is in contact with the contact portion 112t, thereby restricting movement of the tube 50 in the Y2 direction. This allows the multiple fingers 120a of the pump unit 120 to reliably press the tube 50 in the Y2 direction.

[0091] Here, the plate-like member 112 further has, on at least a portion of its surface, a conductive first contact 112s that is electrically connected to the abutting portion 112t. Furthermore, the support frame 140 has, on at least a portion of its surface, a conductive second contact 140s. These first contact 112s and second contact 140s are in contact with each other at least in the closed state (in FIG. 9, the darkly shaded portions correspond to these first contact 112s and second contact 140s).

[0092] That is, as shown in FIG. 9, in the medical infusion device 1 according to this embodiment, the first contact 112s and the second contact 140s correspond to the contact portions between the plate-like member 112 and the support frame 140 described above.

[0093] By configuring it in this manner, even when the tube 50 is pressed by multiple fingers 120a, the accumulation of electric charge on them is suppressed, thereby making it possible to improve the reliability of the operation of the medical infusion device 1.

[0094] In a finger pump in which the tube, the fingers that press against the tube, the cover that contacts the tube, and the support frame that supports the fingers are all made of insulating materials, repeated pressing of the tube by the fingers tends to cause electric charges to accumulate on the tube and the fingers, and if no measures are taken, there is a concern that the accumulation of electric charges may cause a short circuit in the electronic board that controls the finger pump. If such a short circuit occurs, there is a risk of malfunctioning of the finger pump and the medical infusion device that includes it.

[0095] In this regard, in the medical infusion device 1 of this embodiment, at least in the closed state, the conductive first contact 112s of the plate-shaped member 112 comes into contact with the conductive second contact 140s of the support frame 140, thereby causing the conductive abutment portion 112t of the plate-shaped member 112 to be electrically connected to the second contact 140s via the first contact 112s.

[0096] With this configuration, the electric charges accumulated on the fingers 120a and the tube 50 are neutralized toward the support frame 140, whose entire surface, excluding the window frame member 141d, is conductive. Therefore, with the medical infusion device 1 according to this embodiment, it is possible to suppress the accumulation of the electric charges, thereby improving the operational reliability of the medical infusion device.

[0097] Preferably, the second contact 140s is grounded, and in the medical infusion device 1 according to this embodiment, the second contact 140s is grounded. In this configuration, the above-mentioned static elimination effect can be reliably obtained.

[0098] Furthermore, finger pumps with multiple pump units or finger pumps compatible with large diameter tubes, for example with a diameter of 6 mm or more, accumulate a larger amount of the above-mentioned electric charge compared to finger pumps with a single pump unit or finger pumps compatible with relatively small diameter tubes, resulting in a relatively higher risk of malfunctions in the operation of the finger pump or medical infusion devices equipped with the same.

[0099] Therefore, by adopting the configuration of the medical infusion device 1 of this embodiment in a medical infusion device equipped with a finger pump having multiple pump units or a finger pump that can accommodate larger diameter tubes, the above-mentioned de-ionization effect can be obtained more significantly.

[0100] Furthermore, in the medical infusion device 1 according to this embodiment, the plate-like member 112 is elastically biased by the elastic member 113 and pressed against the support frame 140, as described above.

[0101] When configured in this manner, the elastic member 113 can absorb the cumulative tolerances that arise from the accumulation of dimensional tolerances of various parts, such as the dimensional tolerances of the holder 111 that constitutes the cover 110 and the dimensional tolerances of the plate-like member 112.

[0102] Therefore, in the closed state, the first contact 112s of the plate-like member 112 and the second contact 140s of the support frame 140 can be reliably brought into contact with each other, thereby more reliably achieving the above-mentioned neutralization effect.

[0103] Furthermore, the movement of the tube 50 in the Y2 direction is reliably restricted by the contact portions 112t of the plate-like member 112. This allows the pressing forces of the multiple fingers 120a to be transmitted to the tube 50 with stable efficiency, resulting in stable performance of the finger pump 100.

[0104] (Addendum) The characteristic configuration of the medical infusion device disclosed in the above-described embodiment can be summarized as follows.

[0105] [Appendix 1] an insulating tube; a finger pump for transporting the liquid in the tube; The finger pump has a pump unit including a plurality of insulating fingers, a support frame that supports the pump unit, and a cover that can be switched between an open state and a closed state, the plurality of fingers are arranged side by side along the extension direction of the tube so that each finger can press the tube in a direction perpendicular to the extension direction of the tube; the cover is disposed at a position facing the plurality of fingers so that the tube can be sandwiched between the cover and each of the plurality of fingers in the closed state; the cover is disposed at a position where the tube cannot be pinched between the cover and each of the fingers in the open state; the cover has a conductive contact portion that contacts the tube in the closed state and a conductive first contact that is electrically connected to the contact portion, the support frame has a second conductive contact; A medical infusion device configured such that the first contact and the second contact are in contact at least in the closed state so that the electric charge accumulated on the tube when pressed by the multiple fingers is discharged toward the support frame.

[0106] [Appendix 2] the cover has a plate-like member at least a part of whose surface is conductive; 2. A medical infusion device as described in Appendix 1, wherein the first contact and the abutment portion are each formed from the conductive portion of the plate-shaped member.

[0107] [Appendix 3] the cover further includes a holder that holds the plate-like member, and an elastic member interposed between the plate-like member and the holder, A medical infusion device as described in Appendix 2, wherein the plate-shaped member is elastically biased by the elastic member in a direction away from the holder, thereby pressing the plate-shaped member toward the tube side in the closed state.

[0108] [Appendix 4] 4. The medical infusion device according to claim 3, wherein the elastic member is a coiled wave spring.

[0109] [Appendix 5] 5. A medical infusion device according to any one of claims 1 to 4, wherein the cover is rotatably supported by the support frame.

[0110] [Appendix 6] At least a portion of the surface of the support frame is conductive; 6. A medical infusion device according to any one of claims 1 to 5, wherein the second contact is formed by the conductive portion of the support frame.

[0111] [Appendix 7] 7. A medical infusion device according to any one of claims 1 to 6, wherein the second contact is grounded.

[0112] [Appendix 8] 8. A medical infusion device according to any one of claims 1 to 7, wherein the outer diameter of the tube is 6 mm or more.

[0113] [Appendix 9] the tube includes a first tube and a second tube; the pump unit includes a first pump unit and a second pump unit; the first pump unit is capable of pressing the first tube with a plurality of fingers included in the first pump unit; 9. A medical infusion device according to any one of claims 1 to 8, wherein the second pump unit is capable of pressing the second tube with a plurality of fingers provided on the second pump unit.

[0114] (Other forms, etc.) In the above-described embodiment, the entire surface of the support frame excluding the window frame member is electrically conductive, but it is sufficient that at least the surface of the support frame corresponding to the second contact is electrically conductive. Furthermore, when the second contact is grounded, there is no particular limitation on the size of the conductive second contact.

[0115] Furthermore, in the above-described embodiment, an example was given of the case where the entire surface of the plate-shaped member is conductive, but the entire surface of the plate-shaped member does not necessarily need to be conductive; it is sufficient that at least the surface of the portion corresponding to the abutment portion and the first contact is conductive.

[0116] Furthermore, in the above-described embodiment, an example was given of a case in which the plate-shaped members and support frames are made of metal that has been subjected to an anti-rust treatment to form a conductive coating on the entire surface, but the plate-shaped members and support frames may also be made of a conductive material such as aluminum that has not been subjected to an anti-rust treatment.

[0117] In the above-described embodiment, the contact portion of the cover that contacts the tube and the first contact that contacts the support frame are each formed as part of a single plate-like member, but the contact portion and the first contact may each be formed of a different member, and in that case, the surfaces of the conductive portions of these members may be electrically connected to each other via, for example, a conductive wire.

[0118] Furthermore, in the above-described embodiment, the first contact of the plate-shaped member of the cover and the second contact of the support frame are in contact with each other in the closed state. However, these first and second contacts may also be in contact in the open state. More specifically, for example, at least the surface of the hinge portion of the cover is configured to be conductive, and the surface of the hinge portion and the abutting portion of the plate-shaped member of the cover are electrically connected by a conductive wire or the like. Furthermore, the support frame is configured so that its entire surface is electrically conductive. In this configuration, the surface of the hinge portion as the first contact and the surface of the support frame where the hinge portion is attached as the second contact are in contact in the open state.

[0119] Furthermore, in the above-described embodiment, an example was given of a finger pump including three pump units, but the number of pump units is not particularly limited to three, and may be one or a number other than three.

[0120] Furthermore, in the above-described embodiment, the cover has a plurality of plate-like members corresponding to a plurality of pump units, but the number of plate-like members is not limited to a plurality. That is, the cover may have, for example, a single plate-like member sized to be positioned opposite the plurality of pump units in the closed state.

[0121] In addition, in the above-described embodiment, an example has been given in which the window frame member of the support frame is made of a resin material, but the window frame member may also be made of a material whose entire surface is conductive, just like the parts of the support frame other than the window frame member.

[0122] Furthermore, the shape, configuration, size, number, material, etc. of each part shown in the above-described embodiment can be changed in various ways without departing from the spirit of the present invention.

[0123] Furthermore, the characteristic configurations shown in the above-described embodiments can naturally be combined with each other within the scope of the present invention.

[0124] As such, the above-described embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0125] 1 Medical infusion device, 10 Housing, 10a Front, 10b Left side, 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 Replacement fluid container, 100 Finger pump, 110 Cover, 111 Holder, 112 Plate-shaped member, 112a First plate-shaped member, 112b Second plate-shaped member, 112c Third plate-shaped member, 112s First contact, 112t Contact portion, 113 Elastic member, 114 Lever, 114a Grip portion, 114b Protrusion, 115 Hinge portion, 120 Pump unit, 120a, 120a1, 120a2, 120a3, 120a4, 120a5 Finger, 121 First pump unit, 122 Second pump unit, 123 Third pump unit, 130 Drive mechanism, 131 First drive mechanism, 131a, 131a1, 131a2, 131a3, 131a4, 131a5 Shaft, 131b, 131b1, 131b2, 131b3, 131b4, 131b5 Eccentric cam roller, 131c Rotating shaft, 131d Drive belt, 131e Drive shaft, 131f Stepping motor, 132 Casing, 140 Support frame, 140s Second contact, 141 Window portion, 141a First window portion, 141b Second window portion, 141c Third window portion, 141d window frame member, 142 concave portion, 142a first concave portion, 142b second concave portion, 142c third concave portion, 143 tube gripping portion, 143a first tube gripping portion, 143b second tube gripping portion, 143c third tube gripping portion.

Claims

1. an insulating tube; a finger pump for transporting the liquid in the tube; The finger pump includes a pump unit including a plurality of insulating fingers, a support frame that supports the pump unit, and a cover that can be switched between an open state and a closed state. the plurality of fingers are arranged side by side along the extension direction of the tube so that each finger can press the tube in a direction perpendicular to the extension direction of the tube; the cover is disposed at a position facing the plurality of fingers so that the tube can be sandwiched between the cover and each of the plurality of fingers in the closed state; the cover is disposed at a position where the tube cannot be pinched between the cover and each of the fingers in the open state; the cover has a conductive contact portion that contacts the tube in the closed state and a conductive first contact that is electrically connected to the contact portion, the support frame has a second conductive contact; A medical infusion device configured such that the first contact and the second contact are in contact at least in the closed state so that the electric charge accumulated on the tube when pressed by the multiple fingers is discharged toward the support frame.

2. the cover has a plate-like member at least a part of whose surface is conductive; 2. The medical infusion device according to claim 1, wherein the first contact and the abutting portion are each formed by the conductive portion of the plate-like member.

3. the cover further includes a holder that holds the plate-like member, and an elastic member interposed between the plate-like member and the holder, 3. The medical infusion device according to claim 2, wherein the plate-shaped member is elastically biased by the elastic member in a direction away from the holder, so that the plate-shaped member is pressed toward the tube in the closed state.

4. 4. The medical infusion device of claim 3, wherein the resilient member is a coiled wave spring.

5. 2. The medical infusion device of claim 1, wherein the cover is pivotally supported by the support frame.

6. At least a portion of the surface of the support frame is electrically conductive; 2. The medical infusion device of claim 1, wherein the second contact comprises the conductive portion of the support frame.

7. 10. The medical infusion device of claim 1, wherein the second contact is connected to ground.

8. 2. The medical infusion device of claim 1, wherein the tube has an outer diameter of 6 mm or more.

9. the tubes include a first tube and a second tube; the pump unit includes a first pump unit and a second pump unit; the first pump unit is capable of pressing the first tube with a plurality of fingers included in the first pump unit; 2. The medical infusion device according to claim 1, wherein the second pump unit is capable of pressing the second tube with a plurality of fingers provided on the second pump unit.

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