JP7576973B2 - Flow path holding device and liquid treatment device - Google Patents

Description

The present invention relates to a flow path holding device and a liquid treatment device.

Extracorporeal circulation therapies such as dialysis and plasma exchange are performed using blood purification devices. This type of blood purification device has, for example, a blood circuit that supplies the patient's blood to a blood purifier, purifies it, and returns it to the patient, and a fluid replacement circuit that replenishes the blood with fluid (see Patent Document 1). For example, the fluid sent to the patient needs to be heated to a specified temperature range, and for this reason, the fluid replacement circuit is provided with a heating flow path that heats the fluid.

However, the liquid flow paths, including the heating flow path, used in the blood purification device described above are complex flow paths consisting of multiple systems, and it is time-consuming and difficult for medical personnel to attach all of the liquid flow paths to the device body each time. Therefore, a flow path holding device has been proposed that holds some of the liquid flow paths, including the heating flow path, together so that some of the liquid flow paths can be attached to the device body together (see Patent Document 2).

The flow path holding device as described above has, for example, a heating panel having a heating flow path and a frame that holds the heating panel (see Patent Documents 2 and 3).

Patent No. 5160455 JP 2015-073847 A JP 2020-14726 A

However, in the above-mentioned flow path holding device, when an external force is applied, for example during transportation, the frame may bend, which may distort and damage the heating panel. In particular, when the heating panel is placed in a low temperature environment, the heating panel becomes brittle and is more likely to be damaged during transportation. Furthermore, if the frame bends, there is a risk that the heating panel may come off the frame.

This application has been made in consideration of these points, and one of its objectives is to provide a flow path holding device and a liquid treatment device that can prevent damage or detachment of the heating panel that engages with the frame of the flow path holding device.

After extensive research, the inventors discovered that the above problem could be solved by allowing the heating panel to move vertically relative to the frame when engaging the heating panel with the frame, and thus completed the present invention.

That is, the present invention includes the following aspects.
(1) A flow path holding device that holds a liquid flow path, the flow path holding device comprising: a heating panel having a heating flow path and for heating a liquid flowing through the heating flow path; a frame-shaped frame having a frame shape with an opening on the inside and engaging with the heating panel so that the heating panel is positioned in the opening; a pressing member that presses the heating panel to prevent it from coming off the frame-shaped frame; a first engagement mechanism that engages the heating panel with the frame-shaped frame so as to restrict movement of the heating panel relative to the frame-shaped frame in the surface direction of the heating panel and a vertical direction perpendicular to the surface direction when engaged; and a second engagement mechanism that engages the heating panel with the frame-shaped frame at a position separate from the first engagement mechanism so as to restrict movement of the heating panel relative to the frame-shaped frame in the surface direction of the heating panel when engaged while allowing movement in the vertical direction.
(2) The flow path holding device described in (1), wherein the second engagement mechanism is composed of a protrusion portion formed on the frame and extending in the vertical direction, and a frame portion formed on the heating panel and forming a hole through which the protrusion portion is inserted.
(3) A flow path holding device as described in (1) or (2), wherein the first engagement mechanism is composed of a hook portion formed on the frame and a frame portion formed on the heating panel and forming a hole that engages with the hook portion.
(4) A flow path holding device described in any one of (1) to (3), wherein the first engagement mechanism is provided on a first outer edge portion of the heating panel, and the second engagement mechanism is provided on a second outer edge portion opposite the first outer edge portion of the heating panel.
(5) The flow path holding device described in (4), wherein the second engagement mechanism is provided at the center of the edge direction of the second outer edge portion of the heating panel.
(6) A flow path holding device described in (4) or (5), wherein the first engagement mechanism is provided at least at both ends in the edge direction of the first outer edge portion of the heating panel.
(7) A flow path holding device described in any one of (1) to (6), wherein the pressing member has a plate shape that covers the heating panel.
(8) A flow path holding device described in any one of (1) to (7), wherein the pressing member presses the heating panel against the frame-shaped frame so as to prevent the engagement between the heating panel and the frame-shaped frame by the first engagement mechanism and the second engagement mechanism from being released.
(9) The flow path holding device according to any one of (1) to (8), wherein the pressing member is engaged with the frame.
(10) The flow path holding device described in (9), wherein the frame has a locking portion that locks the pressing member and a regulating portion that prevents the pressing member from coming off the locking portion.
(11) A flow path holding device described in any one of (1) to (10), wherein the liquid flow path has a tube, the tube has a connection area connected to the heating flow path of the heating panel, the connection area is arranged on the frame-shaped frame, and the pressing member has a pressing portion that presses the connection area of the tube against the frame-shaped frame.
(12) A flow path holding device described in any one of (1) to (11), wherein the heating panel is made of polyvinyl chloride.
(13) A liquid treatment device comprising: the flow path holding device according to any one of (1) to (12); and an apparatus main body to which the flow path holding device can be freely attached.

The present invention makes it possible to prevent damage or detachment of the heating panel that engages with the frame of the flow path holding device.

FIG. 1 is a perspective view showing an example of a blood purification device. FIG. 2 is an explanatory diagram showing an example of the configuration of a liquid circuit. A front view of a frame to which a heating panel and a pressing member are attached. A front view of a frame with a heating panel attached. FIG. FIG. 4 is an explanatory diagram showing a first engagement mechanism. FIG. 11 is an explanatory diagram showing a second engagement mechanism. 11 is an explanatory diagram showing a locking mechanism between the pressing member and the frame. FIG. FIG. 2 is a front view of the heating panel. FIG. FIG. 2 is an explanatory diagram showing a configuration of a measuring chamber. FIG. 11 is a front view of a frame of another embodiment.

Below, an example of a preferred embodiment of the present invention will be described with reference to the drawings. Note that the positional relationships of the top, bottom, left, right, etc. of the drawings are based on the positional relationships shown in the drawings unless otherwise specified. The dimensional ratios of the drawings are not limited to the ratios shown. Furthermore, the following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to only those embodiments. Furthermore, various modifications of the present invention are possible without departing from the gist of the present invention.

<Blood purification device>
1 is an explanatory diagram showing the outline of the configuration of a blood purification apparatus 1 as a liquid treatment apparatus equipped with a flow path holding device according to this embodiment. The blood purification apparatus 1 has, for example, an apparatus main body 10, an operation panel 11, a cart 12, a pole 13, a liquid circuit 14, and the like.

The device main body 10 is configured to have various devices, equipment, and components necessary for performing blood processing built in or attached thereto. For example, the device main body 10 has built-in or attachable various clamp groups 20 for opening and closing the flow path of the liquid circuit 14, pump groups 21 for pumping the liquid in the liquid circuit 14, a pressure sensor (not shown) for detecting the pressure of the liquid in the liquid circuit 14, and a blood purifier (described later) for purifying the blood. A door 30 is provided on the side of the device main body 10, and the part exposed by opening the door 30 is an attachment section 33 for attaching the flow path holding device 40 of the liquid circuit 14. The attachment section 33 is provided with a flat heater 31 and a measuring device 32. The flow path holding device 40 includes a heating panel 50, a frame-shaped frame 51, a pressing member 52, a measuring chamber 53, and a tube 54. By mounting the flow path holding device 40 to the mounting portion 33 and supplying heat from the heater 31 to the heating panel 50, the liquid flowing through the heating panel 50 can be heated, and the weight of the measuring chamber 53 can be measured by the measuring device 32.

The operation panel unit 11 is, for example, a touch panel, and is capable of inputting various settings for blood processing and displaying the operating status of the blood processing. Liquid bags such as dialysis fluid bags and replacement fluid bags, which will be described later, used in blood processing can be hung from the pole unit 13.

<Liquid circuit>
2 is an explanatory diagram showing an example of the configuration of the liquid circuit 14 for performing dialysis therapy. For example, the liquid circuit 14 has a blood purifier 70, a blood circuit 71, a dialysate supply line 72, a waste fluid line 73, and a replacement fluid line 74. The liquid circuit 14 is detachable from the device main body 10 of the blood purification device 1.

The blood purifier 70 is, for example, a cylindrical membrane module having a hollow fiber membrane as a purification membrane, and can separate unnecessary components from blood.

The blood circuit 71 includes, for example, a blood collection line 90 that connects the blood collection section 80 and the blood purifier 70, and a blood return line 91 that connects the blood purifier 70 and the blood return section 81. The blood collection line 90 and the blood return line 91 are mainly composed of soft tubes. The blood collection line 90 is connected to the inlet of the blood purifier 70, and the blood return line 91 is connected to the outlet of the blood purifier 70.

The blood collection line 90 is provided with, for example, a pressure pump 100. The blood return line 91 is provided with a drip chamber 110 and a pressure sensor.

The dialysis fluid supply line 72 has a dialysis fluid bag 120 and a dialysis fluid flow path 121 that connects the dialysis fluid bag 120 to the dialysis fluid side nozzle of the blood purifier 70. The dialysis fluid flow path 121 is mainly composed of soft tubes, but is also partially composed of the liquid flow path of the heating panel 50 and the liquid flow path of the metering chamber 53, which will be described later. A dialysis fluid pump 122 is provided in the dialysis fluid flow path 121.

The waste liquid line 73 has a waste liquid flow path 130 that connects the dialysis fluid nozzle of the blood purifier 70 to the waste liquid section. The waste liquid flow path 130 is mainly composed of a soft tube, but is also partially composed of the liquid flow path of the metering chamber 53. The waste liquid flow path 130 is provided with, for example, a filtration pump 131.

The fluid replacement line 74 has a fluid replacement bag 140 and a fluid replacement flow path 141 that connects the fluid replacement bag 140 and the blood return line 91. The fluid replacement flow path 141 is mainly composed of a soft tube, but is also partially composed of the liquid flow path of the heating panel 50 and the liquid flow path of the metering chamber 53. A fluid replacement pump 142 is provided in the fluid replacement flow path 141.

In the above liquid circuit 14, blood purification processing for dialysis therapy, for example, is performed. For example, in the blood circuit 71, the patient's blood is sent from the blood collection section 80 to the blood side of the purification membrane of the blood purifier 70, and after passing through the blood purifier 70, is returned to the patient from the blood return section 81. At this time, the dialysis fluid is sent to the dialysis fluid side of the purification membrane of the blood purifier 70 through the dialysis fluid supply line 72, and then is discharged through the waste fluid line 73. In the blood purifier 70, unnecessary components in the blood passing through the blood side of the purification membrane flow out through the purification membrane to the dialysis fluid side and are discharged together with the dialysis fluid. Meanwhile, replacement fluid is supplied to the blood circuit 71 through the replacement fluid line 74, and the blood is replenished with specified components.

<Flow path holding device>
2, the flow path holding device 40 holds, for example, at least a part of the liquid circuit 14, i.e., at least a part of the dialysis fluid flow path 121, at least a part of the waste fluid flow path 130, and at least a part of the replacement fluid flow path 141, and is configured to be freely attached to and detached from the apparatus main body 10. Note that the extent to which the flow path holding device 40 holds any of the flow paths of the liquid circuit 14 can be changed as appropriate. The flow path holding device 40 includes, for example, a heating panel 50, a frame-shaped frame 51, a pressing member 52, a measuring chamber 53, and a tube 54 which is a part of the liquid flow path.

Figure 3 is a front view of the frame 51 to which the heating panel 50 and the pressing member 52 are attached. Figure 4 is a front view of the frame 51 to which the heating panel 50 is attached. Figure 5 is a front view of the frame 51. As shown in Figures 3 to 5, the frame 51 has a rectangular plate shape and is made of hard resin, for example, ABS resin. The frame 51 has an opening 160 in the center where the heating panel 50 is placed. The opening 160 has a rectangular shape. The frame 51 has a plurality of fixing parts 161 for fixing the tubes 54. The arrangement and number of the fixing parts 161 are not limited to those shown in Figures 3 to 5 and can be changed as appropriate.

The upper hook portion 170 is provided on the upper portion 51a above the opening 160 of the frame 51 for engaging the upper portion of the heating panel 50 and the upper portion of the pressing member 52. The upper hook portion 170 is provided at two locations corresponding to both ends of the opening 160 in the left-right direction (horizontal direction) X1 in the upper portion 51a. As shown in FIG. 6, the upper hook portion 170 has a first portion 170a extending in a vertical direction Z perpendicular to the surface direction X of the frame 51, and a second portion 170b connected to the tip of the first portion 170a and extending from the tip upward in the vertical direction X2 of the frame 51. In this specification, "upper", "lower", "left", and "right" are based on the posture of the flow path holding device 40 when in use, as shown in FIGS. 1 to 5. In addition, the "surface direction X" in this embodiment includes X1 and X2.

As shown in Figures 3 to 5, the lower part 51b below the opening 160 of the frame 51 is provided with a protrusion 180 for engaging the lower part of the heating panel 50. The protrusion 180 is provided at a position corresponding to the center of the opening 160 in the left-right direction X1 in the lower part 51b. As shown in Figure 7, the protrusion 180 has a rod shape and extends in the vertical direction Z perpendicular to the surface direction X of the frame 51.

As shown in Figures 3 to 5, the lower part 51b below the opening 160 of the frame 51 is provided with a lower hook part 190 for engaging the lower part of the pressing member 52. The lower hook part 190 is provided in two places corresponding to both ends of the opening 160 in the left-right direction X1. As shown in Figure 8, the lower hook part 190 has a first part 190a extending in the vertical direction Z perpendicular to the surface direction X of the frame 51, and a second part 190b connected to the tip of the first part 190a and extending downward from the tip in the up-down direction X2 of the frame 51.

As shown in Figures 3 to 5, the upper portion 51a of the frame 51 is provided with an upper regulating portion 200 that prevents the pressing member 52 from coming off the upper hook portion 170. The upper regulating portion 200 is provided above each upper hook portion 170 and slightly closer to the center in the left-right direction X1 than each upper hook portion 170. The upper regulating portion 200 extends in the vertical direction Z as shown in Figure 6, for example, and has a plate shape with the plate surface facing downward. The upper regulating portion 200 has a width in the left-right direction X1 that is approximately the same as or longer than that of the upper hook portion 170.

As shown in Figures 3 to 5, the lower portion 51b of the frame 51 is provided with a lower restriction portion 210 that restricts the pressing member 52 from coming off the lower hook portion 190. The lower restriction portion 210 is provided at a position below each lower hook portion 190. The lower restriction portion 210 extends in the vertical direction Z as shown in Figure 8, for example, and has a plate shape with the plate surface facing upward. The lower restriction portion 210 has a width in the left-right direction X1 that is approximately the same as or longer than the lower hook portion 190.

As shown in Figures 3, 4 and 9, the heating panel 50 has a generally rectangular thin plate shape. The heating panel 50 is made of, for example, polyvinyl chloride, the same material as the tubes 54. The heating panel 50 has a panel main body 250 having a liquid flow path, and an upper frame portion 251 and a lower frame portion 252 for engaging the heating panel 50 with the frame 51.

As shown in FIG. 9, the panel body 250 is formed in a thin rectangular shape. The panel body 250 has two continuous heating flow paths 262 from the inlet 260 to the outlet 261. The inlet 260 and the outlet 261 are provided on the upper short side of the panel body 250 in the vertical direction X2. Each heating flow path 262 has a serpentine section 270 that extends downward from the inlet 260 while snaking left and right, and a straight section 271 that passes straight from the bottom of the serpentine section 270 to the side of the serpentine section 270 and is connected to the outlet 261. The two heating flow paths 262 are arranged side by side on the left and right of the panel body 250. The inlet 260 and the outlet 261 form a connection section for connecting the heating flow path 262 to the tube 54. For example, a tube 54 of the dialysis fluid flow path 121 is connected to the connection of one heating flow path 262, and a tube 54 of the replacement fluid flow path 141 is connected to the connection of the other heating flow path 262. As a result, one heating flow path 262 constitutes a part of the dialysis fluid flow path 121, and the other heating flow path 262 constitutes a part of the replacement fluid flow path 141. The part of the tube 54 connected to the heating flow path 262 near the inlet portion 260 and the outlet portion 261 becomes the connection region 54a of the tube 54.

The upper frame portion 251 is provided, for example, on the upper edge portion 50a as the first outer edge portion of the heating panel 50. The upper frame portion 251 is provided on both ends of the upper edge portion 50a of the heating panel 50 in the left-right direction X1. The upper frame portion 251 is formed in a rectangular shape, and in its center is formed a hole 290 that engages with the upper hook portion 170 of the frame-shaped frame 51. The hole 290 has a width approximately the same as the width of the upper hook portion 170 in the left-right direction X1.

The lower frame portion 252 is provided, for example, on the lower edge portion 50b as the second outer edge portion of the heating panel 50. The lower frame portion 252 is provided in the center of the lower edge portion 50b of the heating panel 50 in the left-right direction X1. The lower frame portion 252 is formed in a rectangular shape, and in its center, a hole 291 is formed that engages with the protrusion portion 180 of the frame-shaped frame 51. The hole 291 has a width approximately the same as the width of the lower hook portion 190 in the left-right direction X1.

The distance L1 in the vertical direction X2 from the hole 290 in the upper frame portion 251 of the heating panel 50 to the hole 291 in the lower frame portion 252 is set to be approximately the same length as the distance L2 (shown in FIG. 5) in the vertical direction X2 from the upper hook portion 170 of the frame 51 to the protrusion portion 180.

As shown in FIG. 10, the pressing member 52 has a generally rectangular thin plate shape. The pressing member 52 is transparent and is made of, for example, PET (polyethylene terephthalate). The pressing member 52 has higher flexibility and impact strength at low temperatures than the heating panel 50. The pressing member 52 is larger in area than the heating panel 50 and can cover the entire surface of the heating panel 50.

The pressing member 52 has upper protrusions 300 located at both ends of the upper part in the left-right direction X1 and protruding upward. The pressing member 52 has connection parts 301 that extend in the upper left-right direction X1 and connect the upper protrusions 300 together.

The pressing member 52 has lower protrusions 310 located at both ends of the lower part in the left-right direction X1 and protruding downward. The pressing member 52 also has a recessed portion 311 in the center of the lower part in the left-right direction X1.

The pressing member 52 has an upper locking portion 320 for locking onto the hook portion 170 of the upper portion 51a of the frame 51, a lower locking portion 321 for locking onto the hook portion 190 of the lower portion 51b of the frame 51, and a pressing portion 322 for pressing the connection area 54a of the tube 54 connected to the heating panel 50 against the frame 51.

The upper locking portion 320 is formed by a square opening. The upper locking portion 320 is provided on the upper protruding portion 300.

The lower engaging portion 321 is formed by a rectangular opening. The lower engaging portion 321 is provided on the lower protruding portion 310.

The pressing portion 322 is composed of the connection portion 301. The pressing portion 322 can press the connection area 54a of the tube 54 connected to the heating flow path 262 against the upper portion 51a of the frame 51.

The vertical distance L3 in the X2 direction from the upper locking portion 320 to the lower locking portion 321 of the pressing member 52 is set to be approximately the same length as the vertical distance L4 (shown in FIG. 5) in the X2 direction from the upper hook portion 170 to the lower hook portion 190 of the frame-shaped frame 51. In addition, the vertical distance L5 (shown in FIG. 6) in the X2 direction from the tip of the upper hook portion 170 to the upper regulating portion 200 is smaller than the vertical distance L6 (shown in FIG. 10) in the X2 direction from the upper end of the upper protruding portion 300 of the pressing member 52 to the upper locking portion 320 (opening), preferably by 3 mm or more. Similarly, the vertical distance L7 (shown in FIG. 8) in the X2 direction from the tip of the lower hook portion 190 to the lower regulating portion 210 is smaller than the vertical distance L8 (shown in FIG. 10) in the X2 direction from the lower end of the lower protruding portion 310 of the pressing member 52 to the lower locking portion 321 (opening).

<Engagement mechanism between heating panel and frame>
As shown in FIG. 4 , the flow path holding device 40 has a first engagement mechanism 350 and a second engagement mechanism 351 that engage the heating panel 50 with the frame 51 .

The first engagement mechanism 350 engages the upper part of the heating panel 50 with the frame 51. The first engagement mechanism 350 is composed of, for example, the upper frame part 251 of the heating panel 50 and the upper hook part 170 of the frame 51.

The second engagement mechanism 351 engages the lower part of the heating panel 50 with the frame 51. The second engagement mechanism 351 is composed of, for example, the lower frame part 252 of the heating panel 50 and the protrusion part 180 of the frame 51.

When the first engagement mechanism 350 and the second engagement mechanism 351 engage the heating panel 50 with the frame 51, the two upper frame portions 251 of the heating panel 50 are engaged with the upper hook portion 170 of the frame 51, and one lower frame portion 252 is fitted into the protrusion portion 180 of the frame 51. As a result, the first engagement mechanism 350 engages the heating panel 50 with the frame 51 so that the heating panel 50 does not move relative to the frame 51 in the surface direction X of the heating panel 50 and in the vertical direction Z perpendicular to the surface direction X. The second engagement mechanism 351 engages the heating panel 50 with the frame 51 so that the heating panel 50 does not move relative to the frame 51 in the surface direction X of the heating panel 50, but moves in the vertical direction Z.

<Lock mechanism of the pressing member>
As shown in FIG. 3 , the flow passage holding device 40 includes a locking mechanism 360 that locks the pressing member 52 to the frame 51 .

The locking mechanism 360 is composed of, for example, the upper locking portion 320 and the lower locking portion 321 of the pressing member 52, and the upper hook portion 170 and the lower hook portion 190 of the frame 51.

When the retaining member 52 and the frame 51 are retained by the retaining mechanism 360, the two upper retaining portions 320 of the retaining member 52 are retained by the upper hook portions 170 of the frame 51, and the two lower retaining portions 321 are retained by the lower hook portions 190 of the frame 51.

<Measuring chamber>
1 and 2, the metering chamber 53 is provided at the bottom of the frame 51. The metering chamber 53 is a chamber for measuring the total amount of dialysis fluid supplied to the blood purifier 70, the amount of dialysis fluid discharged from the blood purifier 70, and the amount of replacement fluid supplied to the blood circuit 71 in order to manage the amount of water removed from the patient. As shown in Fig. 11, the metering chamber 53 is formed in a panel shape and made of thermoplastic resin. The metering chamber 53 has three storage sections 400, 401, 402, seven inlets and outlets 410-416, and seven flow paths 420-426.

The storage sections 400, 401, and 402 are arranged side by side in this order at the bottom of the metering chamber 53. The first to fourth inlets 410 to 413 are arranged, for example, in this order on the left side of the upper part of the metering chamber 53 from bottom to top, and the fifth to seventh inlets 414 to 416 are arranged in this order on the right side from bottom to top. The first flow path 420 connects the first storage section 400 to the first inlet 410, the second flow path 421 connects the first storage section 400 to the second inlet 411, the third flow path 422 connects the second storage section 401 to the third inlet 412, and the fourth flow path 423 connects the second storage section 401 to the fourth inlet 413. The fifth flow path 424 connects the second storage section 401 to the fifth inlet/outlet 414, and the sixth flow path 425 connects the third storage section 402 to the sixth inlet/outlet 415. The seventh flow path 426 connects the third storage section 402 to the seventh inlet/outlet 416.

The first inlet/outlet 410 and the second inlet/outlet 411 are connected to the tube 54 of the waste fluid flow path 130 of the flow path holding device 40. As a result, the first storage unit 400 functions as a measuring unit that temporarily stores and measures the dialysis fluid discharged from the blood purifier 70. The third inlet/outlet 412 and the fifth inlet/outlet 414 are connected to the tube 54 of the dialysis fluid flow path 121 of the flow path holding device 40. As a result, the second storage unit 401 functions as a measuring unit that temporarily stores and measures the dialysis fluid supplied to the blood purifier 70. The sixth inlet/outlet 415 is connected to the tube 54 of the replacement fluid flow path 141 of the flow path holding device 40. As a result, the third storage unit 402 functions as a measuring unit that temporarily stores and measures the replacement fluid supplied to the blood circuit 71.

The measuring chamber 53 is weighed by the weighing device 32 of the device main body 10, and by measuring the total weight of the amount of dialysis fluid supplied to the blood purifier 70, the amount of dialysis fluid discharged from the blood purifier 70, and the amount of replacement fluid supplied to the blood circuit 71, it is possible to grasp the change in the total weight, i.e., the change in the amount of water removed from the patient.

The tube 54 shown in FIG. 2 is made of soft polyvinyl chloride. The tube 54 mainly constitutes a part or all of the dialysis fluid flow path 121, a part or all of the waste fluid flow path 130, and a part or all of the replacement fluid flow path 141, and at least a part of the tube 54 is fixed to the fixing part 161 of the frame 51.

Next, we will explain how to use the flow path holding device 40 configured as described above.

As shown in FIG. 4, the heating panel 50 is attached to the frame 51. At this time, in the first engagement mechanism 350 and the second engagement mechanism 351, the two upper frame portions 251 of the heating panel 50 are engaged with the upper hook portion 170 of the frame 51, and one lower frame portion 252 is fitted into the protrusion portion 180 of the frame 51. As a result, in the first engagement mechanism 350, the heating panel 50 and the frame 51 are engaged so that the heating panel 50 does not move in the surface direction X and the vertical direction Z of the heating panel 50 relative to the frame 51. In the second engagement mechanism 351, the heating panel 50 and the frame 51 are engaged so that the heating panel 50 does not move in the surface direction X of the heating panel 50 relative to the frame 51, but moves in the vertical direction Z.

Next, as shown in Figure 3, a pressing member 52 that presses down on the heating panel 50 is attached to the frame 51. The pressing member 52 is positioned on the surface side of the heating panel 50 in the vertical direction Z (the front side of the paper in Figure 3) and presses down on the heating panel 50 from the surface side in the vertical direction Z. At this time, in the locking mechanism 360, the two upper locking portions 320 of the pressing member 52 are locked to the upper hook portions 170 of the frame 51, and the two lower locking portions 321 are locked to the lower hook portions 190 of the frame 51.

Then, with the heating panel 50, the pressing member 52, and the tube 54 attached to the frame 51, the flow path holding device 40 is installed in the mounting portion 33 of the device main body 10.

According to this embodiment, the flow path holding device 40 is provided with a first engagement mechanism 350 that engages the heating panel 50 with the frame-shaped frame 51 so as to restrict the heating panel 50 from moving in the planar direction X and the vertical direction Z relative to the frame-shaped frame 51 when engaged, and a second engagement mechanism 351 that engages the heating panel 50 with the frame-shaped frame 51 at a position different from the first engagement mechanism 350 so as to restrict the heating panel 50 from moving in the planar direction X of the heating panel 50 relative to the frame-shaped frame 51 when engaged while allowing it to move in the vertical direction Z. As a result, the second engagement mechanism 351 allows a part of the heating panel 50 to move in the vertical direction Z relative to the frame-shaped frame 51, so that, for example, when the frame-shaped frame 51 bends, the heating panel 50 can be prevented from bending and being damaged in the same manner. In addition, since the heating panel 50 is positioned by the first engagement mechanism 350 and the second engagement mechanism 351, the heating panel 50 is appropriately heated by the heater 31 of the blood purification device 1. Furthermore, since the flow path holding device 40 is provided with a pressing member 52 that presses the heating panel 50, even if the second engagement mechanism 351 allows a portion of the heating panel 50 to move in the vertical direction Z relative to the frame 51, the heating panel 50 can be prevented from coming off the frame 51.

The second engagement mechanism 351 is formed on the frame 51 and is composed of a protrusion 180 extending in the vertical direction Z, and a lower frame portion 252 formed on the heating panel 50 and defining a hole 291 through which the protrusion 180 passes. This allows the heating panel 50 to move appropriately in the vertical direction Z without moving appropriately in the planar direction X relative to the frame 51.

The first engagement mechanism 350 is composed of an upper hook portion 170 formed on the frame 51 and an upper frame portion 251 formed on the heating panel 50 and forming a hole 290 that engages with the upper hook portion 170. This makes it possible to appropriately prevent the heating panel 50 from moving in the planar direction X and the vertical direction Z relative to the frame 51.

The first engagement mechanism 350 is provided on the upper edge 50a of the heating panel 50, and the second engagement mechanism 351 is provided on the lower edge 50b of the heating panel 50. This allows the first engagement mechanism 350 and the second engagement mechanism 351 to be positioned apart, ensuring a sufficient amount of movement of the heating panel 50 in the vertical direction Z.

The second engagement mechanism 351 is provided at the center of the left-right direction (edge direction) X1 of the lower edge portion 50b of the heating panel 50. This allows the heating panel 50 to move evenly left and right in the vertical direction Z, thereby more effectively preventing damage to the heating panel 50.

The first engagement mechanism 350 is provided at least on both ends of the upper edge 50a of the heating panel 50 in the left-right direction X1. This allows the movement of the heating panel 50 to be sufficiently regulated without bias on the left and right.

The pressing member 52 has a plate shape that covers the heating panel 50, so that the entire heating panel 50 can be appropriately pressed down without concentrating stress locally. In addition, the pressing member 52 can protect the heating panel 50 from being hit by external objects during transportation, etc.

The pressing member 52 presses the heating panel 50 against the frame 51 so that the engagement between the heating panel 50 and the frame 51 by the first engagement mechanism 350 and the second engagement mechanism 351 does not come off. This effectively prevents the heating panel 50 from coming off the frame 51.

The retaining member 52 is engaged with the frame 51, so that the retaining member 52 can reduce the bending of the frame 51. In addition, the retaining member 52 can be easily attached to a predetermined position.

The frame 51 has an upper hook portion 170 and a lower hook portion 190 that engage the pressing member 52, and an upper regulating portion 200 and a lower regulating portion 210 that regulate the pressing member 52 from coming off the upper hook portion 170 and the lower hook portion 190. As a result, when the frame 51 is bent, for example, the upper and lower ends of the pressing member 52 come into contact with the upper regulating portion 200 and the lower regulating portion 210, regulating the movement of the pressing member 52, and thus regulating the pressing member 52 from coming off the hook portions 170 and 190.

The tube 54 has a connection area 54a that connects to the heating flow path 262 of the heating panel 50, the connection area 54a is disposed on the frame 51, and the pressing member 52 has a pressing portion 322 that presses the connection area 54a of the tube 54 against the frame 51. Depending on the arrangement direction of the tube 54 that is connected to the heating flow path 262, an external force that causes the vicinity of the connection area 54a to bulge in the vertical direction Z is applied, but the pressing portion 322 presses the connection area 54a, thereby suppressing the bulging of the connection area 54a. This makes it possible to suppress damage and deformation of the heating panel 50, for example, when the heating panel 50 is pressed against the heater 31 by the door 30 of the device main body 10.

The heating panel 50 is made of polyvinyl chloride. In this case, the heating panel 50 can be easily connected to the polyvinyl chloride tube 54. On the other hand, the strength of the heating panel 50 decreases at low temperatures, but by allowing the heating panel 50 to move in the vertical direction Z, damage to the heating panel 50 can be suppressed.

The configuration of the flow path holding device 40 described in the above embodiment is not limited to this. For example, the configuration of the frame-shaped frame 51 may have a different configuration. For example, the shapes, arrangements, and numbers of the upper hook portion 170, the protrusion portion 180, the lower hook portion 190, the upper regulating portion 200, and the lower regulating portion 210 of the frame-shaped frame 51 are not limited to this. For example, in another embodiment of the frame-shaped frame 51 as shown in FIG. 12, one of the lower regulating portions 210 of the frame-shaped frame 51 may be divided into two and arranged so as to be separated to the left and right with respect to directly below the lower hook portion 190. In addition, the other lower regulating portion 210 may be provided at a position shifted outward in the left-right direction X1 from directly below the lower hook portion 190.

The configuration of the heating panel 50 is not limited to that of the above embodiment. The number, arrangement, shape, etc. of the engagement parts of the first engagement mechanism 350 and the second engagement mechanism 351 are not limited to those of the above embodiment. For example, the protrusion 180 and the lower frame-shaped portion 252 of the second engagement mechanism 351 may be provided in multiple locations. In addition, the number of engagement mechanisms of the heating panel 50 is not limited to two, the first engagement mechanism 350 and the second engagement mechanism 351, and may be three or more. In addition, the protrusion 180 and the frame-shaped portion 252 of the second engagement mechanism 351 may be provided on the upper part of the frame-shaped frame 51, and the hook portion 170 and the frame-shaped portion 251 may be provided on the lower part of the frame-shaped frame 51. In the present invention, "when engaged, the heating panel is restricted from moving in the direction perpendicular to the surface of the heating panel relative to the frame-shaped frame" and "when engaged, the heating panel is restricted from moving in the surface of the heating panel relative to the frame-shaped frame" mean that when engaged by the first engagement mechanism and the second engagement mechanism, the heating panel does not move to an extent that it is substantially positioned relative to the frame-shaped frame, and may move slightly.

The configuration of the pressing member 52 is not limited to that of the above embodiment. The number, arrangement, shape, etc. of the locking parts of the locking mechanism 360 are not limited to those of the above embodiment.

The configurations of the metering chamber 53 and the tube 54 are not limited to those in the above embodiment. In addition, the flow path holding device 40 may not include a metering chamber.

The configuration of the blood purification device 1 in which the flow path holding device 40 is installed is not limited to that of the above embodiment. For example, the blood purification device 1 in the above embodiment performs dialysis therapy, but the present invention can also be applied to other liquid treatment devices that perform plasma exchange therapy, leukocyte removal therapy, continuous slow hemofiltration therapy, etc.

The present invention is useful in preventing damage or detachment of the heating panel that engages with the frame of the flow path holding device.

REFERENCE SIGNS LIST 1 Blood purification device 40 Flow path holding device 50 Heating panel 51 Frame 52 Holding member 53 Measuring chamber 54 Tube 350 First engagement mechanism 351 Second engagement mechanism 360 Locking mechanism X Planar direction Z Vertical direction

Claims (13)

A flow path holding device for holding a liquid flow path,
A heating panel having a heating flow path for heating a liquid flowing through the heating flow path;
a frame-shaped frame having an opening on the inside and engaging with the heating panel so that the heating panel is disposed in the opening;
A pressing member that presses the heating panel so that it does not come off from the frame;
a first engagement mechanism that engages the heating panel with the frame-shaped frame so as to restrict the heating panel from moving relative to the frame-shaped frame in a surface direction of the heating panel and in a vertical direction perpendicular to the surface direction;
A flow path holding device comprising: a second engagement mechanism that engages the heating panel with the frame-shaped frame at a position different from the first engagement mechanism so that, when engaged, the heating panel is permitted to move in the vertical direction while restricting movement of the heating panel relative to the frame-shaped frame in the planar direction of the heating panel. The second engagement mechanism includes:
A protrusion portion formed on the frame and extending in the vertical direction;
The flow path holding device according to claim 1 , which is configured by a frame-shaped portion formed on the heating panel and defining a hole through which the protrusion is inserted. The flow path holding device according to claim 1 or 2, wherein the first engagement mechanism is composed of a hook portion formed on the frame and a frame portion formed on the heating panel and forming a hole that engages with the hook portion. The first engagement mechanism is provided on a first outer edge of the heating panel,
The flow path holding device according to any one of claims 1 to 3, wherein the second engagement mechanism is provided on a second outer edge portion opposed to a first outer edge portion of the heating panel. The flow path retainer according to claim 4, wherein the second engagement mechanism is provided at the center of the second outer edge of the heating panel in the edge direction. The flow path retainer according to claim 4 or 5, wherein the first engagement mechanism is provided at least on both ends of the first outer edge of the heating panel in the edge direction. The flow path retainer according to any one of claims 1 to 6, wherein the pressing member has a plate shape that covers the heating panel. The flow path retaining device according to any one of claims 1 to 7, wherein the pressing member presses the heating panel against the frame so as to prevent the engagement between the heating panel and the frame by the first engagement mechanism and the second engagement mechanism from being released. The flow path holding device according to any one of claims 1 to 8, wherein the pressing member is engaged with the frame. The frame is
A locking portion that locks the pressing member;
The flow path holding device according to claim 9 , further comprising a restricting portion that restricts the pressing member from coming off the locking portion. The liquid flow path includes a tube, the tube having a connection region that is connected to a heating flow path of the heating panel;
The connection region is disposed on the frame,
The flow path holding device according to any one of claims 1 to 10, wherein the pressing member has a pressing portion that presses a connection region of the tube against the housing-shaped frame. The flow path holding device according to any one of claims 1 to 11, wherein the heating panel is made of polyvinyl chloride. A flow path holding device according to any one of claims 1 to 12,
A liquid treatment device comprising: an apparatus main body to which the flow path holding device can be freely attached.

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