Medical liquid delivery system

Abstract

A medical liquid delivery system (10) is provided with a pressure reaction part (24). The pressure reaction part (24) is connected to a branch part (144) branched from an intermediate part (143) of a tube (14). The pressure reaction part (24) includes a pressure receiving part (242) that can be deformed by receiving the liquid pressure of a sampling target (L), and a state change part (243) the state of which changes in response to the deformation of the pressure receiving part (242).

Description

Medical fluid delivery system

[0001] The present disclosure relates to a medical fluid delivery system.

[0002] Japanese Patent Application Laid-Open No. 2021-072926 discloses a urine measurement device capable of measuring the pressure of urine in the bladder of a living body. The urine measurement device includes a pressure sensor and a recording device. With a urinary catheter inserted into the bladder, the pressure (fluid pressure) of urine in the urinary catheter is replaced with the air pressure of a gas, and the gas is detected by the pressure sensor.

[0003] Japanese Patent Application Laid-Open No. 2021-072926

[0004] In Japanese Patent Application Laid-Open No. 2021-072926, when transmitting the pressure (fluid pressure) of urine as the air pressure of a gas, since the gas is a compressible fluid with respect to the liquid which is an incompressible fluid, the pressure measurement value varies depending on the position (height) condition for measurement. Specifically, the pressure value changes due to the height difference between the bladder and the pressure detection position. Therefore, not only the actually changed pressure but also the pressure change due to the height difference needs to be considered, and there is a problem that the pressure (fluid pressure) change that changes with the generation of urine cannot be accurately measured simply by measurement.

[0005] The present disclosure aims to solve the above-described problems.

[0006] (1) An aspect of the present disclosure is a medical fluid delivery system for delivering a sample, which is a liquid generated in a living body, to the medical bag through the catheter and the tube, comprising a catheter, a tube connected to the catheter, and a medical bag connected to the tube, wherein the tube comprises an inlet end connected to the catheter into which the sample is introduced, an outlet end connected to the medical bag into which the sample is delivered, an intermediate section provided between the inlet end and the outlet end, and a branch section branching off from the intermediate section, and the medical fluid delivery system comprises a pressure reaction section connected to the branch section, the pressure reaction section having a pressure receiving section that can be deformed by receiving the fluid pressure of the sample, and a state changing section whose state changes in accordance with the deformation of the pressure receiving section in order to detect the fluid pressure, and the state of the state changing section is detectable as a parameter for determining the fluid pressure.

[0007] This medical fluid delivery system allows for accurate detection of changes in the fluid pressure of the sampled substance at the generation site by positioning the pressure reaction unit at the same height as the storage site of the sampled substance within the body.

[0008] (2) In the medical fluid delivery system described in (1) above, the pressure reaction section comprises a housing, a first space provided inside the housing and communicating with the branching section, and a second space provided inside the housing and not communicating with the tube, which is the state change section and is filled with gas, wherein the pressure receiving section is a partition wall separating the first space and the second space, and the parameter may be the pressure of the gas in the second space.

[0009] With this configuration, the liquid pressure of the sampled object is transmitted to the gas by the pressure-receiving unit, allowing the liquid pressure of the sampled object to be detected based on the gas pressure using a simple setup.

[0010] (3) In the medical fluid delivery system described in (1) or (2) above, the system includes a occlusion unit capable of blocking the intermediate portion of the tube to block the flow of the sample to be collected through the tube, and a control unit that controls the state of the tube being blocked by the occlusion unit, wherein the control unit may release the blockage of the tube by the occlusion unit when the parameter exceeds a predetermined value.

[0011] This configuration allows the tube to be opened when the amount of sample to be collected in the body increases, effectively suppressing the accumulation of sample within the tube.

[0012] (4) In the medical fluid delivery system described in (1) or (2) above, the inner diameter of the branching portion may be formed to be smaller than the inner diameter of the intermediate portion.

[0013] This configuration effectively suppresses the flow of the sampled material from the middle section to the branching section by making the branching section narrower than the middle section.

[0014] (5) In the medical fluid delivery system described in (1) or (2) above, the pressure receiving part may be a membrane.

[0015] This configuration allows for the effective conversion and transmission of the liquid pressure of the sampled object into atmospheric pressure using a simple design.

[0016] (6) In the medical fluid delivery system described in (1) or (2) above, the pressure reaction unit may be provided with a mounting structure that can be attached to and fixed to the object to be attached.

[0017] This configuration allows for accurate detection of the liquid pressure of the sampled substance by fixing the pressure-reacting unit to the mounting target near the storage site of the sampled substance within the body, using the mounting structure.

[0018] (7) In the medical fluid delivery system described in (6) above, the object to be attached may be the living body or an object worn by the living body.

[0019] This configuration allows the pressure-reacting section to be positioned and fixed closer to the storage site in the body.

[0020] (8) In the medical fluid delivery system described in (6) above, the mounting structure may have an attachment portion that can be attached to the surface of the object to be mounted.

[0021] This configuration allows the pressure-reactive part to be effectively fixed to the surface to which it is attached.

[0022] (9) In the medical fluid delivery system described in (1) or (2) above, the state change unit may be at least one of a strain gauge, an optical sensor, an ultrasonic sensor, or an electrical contact sensor. This configuration allows for more accurate detection of the fluid pressure of the sampled object with a simpler configuration.

[0023] According to this disclosure, in a medical fluid delivery system, by positioning the pressure reaction unit at the same height as the storage site of the sample to be collected within the body, the fluid pressure of the sample to be collected at the generation site can be detected with high accuracy.

[0024] Figure 1 is a configuration diagram of a medical fluid delivery system according to an embodiment of the present disclosure. Figure 2 is an explanatory diagram of how to use the medical fluid delivery system. Figure 3 is a configuration diagram of the pressure reaction unit. Figure 4 is a cross-sectional view of the pressure reaction unit shown in Figure 3. Figure 5 is a block diagram of the medical fluid delivery system. Figure 6 is a configuration diagram of the pressure reaction unit according to a first modified example. Figure 7 is a configuration diagram of the pressure reaction unit according to a second modified example. Figure 8 is a configuration diagram of the pressure reaction unit according to a third modified example. Figure 9 is a configuration diagram of the pressure reaction unit according to a fourth modified example.

[0025] As shown in Figure 1, the medical fluid delivery system 10 according to this embodiment is a medical device for delivering a sample target L, which is a liquid generated in the body cavity C of a living organism B, to a medical bag 16 via a tube 14 (see Figure 2). As shown in Figure 2, the medical fluid delivery system 10 is used, for example, to deliver urine L1 from the bladder C1, which is a body cavity C of living organism B, to the medical bag 16. The following describes the case in which the medical fluid delivery system 10 delivers urine L1 from the bladder C1. Note that the sample target L that can be delivered by the medical fluid delivery system 10 is not limited to urine L1. The sample target L can be any liquid generated in the body cavity C of living organism B.

[0026] As shown in Figure 1, the medical fluid delivery system 10 comprises a catheter 12, a tube 14, a medical bag 16, a console 18, and a pump device 20.

[0027] The catheter 12 is a medical device that is placed inside the body B when in use to drain urine L1 from the bladder C1 into a medical bag 16 placed outside the body (see Figure 2). The catheter 12 comprises a hollow catheter body 121, a balloon 122 provided at the tip of the catheter body 121, and a catheter hub 123 provided at the proximal end of the catheter body 121.

[0028] The tube 14 is flexible. The tube 14 comprises an inlet end 141, an outlet end 142, an intermediate section 143, and a branching section 144. The inlet end 141 is located at the tip of the tube 14 in the extending direction and is open. A catheter 12 is connected to the inlet end 141. Urine L1 from the bladder C1 is introduced into the tube 14 from the catheter 12 through the inlet end 141.

[0029] The outlet end 142 is provided at the base end of the tube 14 in the extending direction and opens. The outlet end 142 is connected to the medical bag 16. The urine L1 introduced into the tube 14 is discharged to the medical bag 16 through the outlet end 142. The intermediate section 143 is provided between the introduction end 141 and the outlet end 142.

[0030] As shown in Figure 3, the branch section 144 branches off from the intermediate section 143. The branch section 144 branches off from the intermediate section 143 via a branch connector 145 connected to the intermediate section 143. The branch section 144 is a tubular body having the same flexibility as the intermediate section 143. The first end 144A of the branch section 144 is connected to the branch connector 145. The inner diameter D1 of the branch section 144 is smaller than the inner diameter D2 of the intermediate section 143. When urine L1 in the bladder C1 is delivered to the medical bag 16, a portion of the urine L1 flowing through the intermediate section 143 of the tube 14 flows to the branch section 144. At this time, the flow rate of urine L1 from the intermediate section 143 to the branch section 144 is less than the flow rate of urine L1 going through the intermediate section 143 to the medical bag 16. Note that the inner diameter D1 of the branch section 144 is not limited to being smaller than the inner diameter D2 of the intermediate section 143. For example, the inner diameter of the branch section 144 and the inner diameter of the intermediate section 143 may be the same. Alternatively, the inner diameter of the branch section 144 may be larger than the inner diameter of the intermediate section 143.

[0031] As shown in Figure 1, the medical bag 16 is a closed bag configured as a urine collection bag. The medical bag 16 comprises a bag body 161 and an introduction tube 162. The medical bag 16 is formed from, for example, a resin material. The introduction tube 162 is connected to the outlet end 142 of the tube 14. Urine L1 in the catheter 12 is introduced through the tube 14 into the bag body 161 from the introduction tube 162.

[0032] The console 18 is positioned adjacent to the medical bag 16. The console 18 is positioned vertically above the medical bag 16. The console 18 comprises a housing 181, a display unit 182, a power button 183, and a tube connection unit 184. Note that the console 18 is not limited to being positioned vertically above the medical bag 16. For example, the console 18 may be positioned diagonally above or parallel to the medical bag 16.

[0033] The pump device 20 is connected to the middle section 143 of the tube 14. The pump device 20 is, for example, a roller pump. The pump device 20 is attached to the tube 14 and housed inside the housing 181. Power is supplied to the pump device 20 from a power source (not shown), causing a fluid delivery unit (not shown) to rotate and sequentially push the tube 14, thereby sending the urine L1 in the tube 14 toward the medical bag 16. Note that the pump device 20 is not limited to a roller pump. For example, the pump device 20 may be a veristar pump, a diaphragm pump, or the like.

[0034] The medical fluid delivery system 10 further comprises an occlusion unit 22, a pressure reaction unit 24, a pressure detection unit 25, and a control device 26.

[0035] The occlusion unit 22 is housed inside the casing 181 of the console 18. The occlusion unit 22 is attached to the intermediate portion 143 of the tube 14. If the pump device 20 is a roller pump, the occlusion unit 22 is the pump device 20 itself. The occlusion unit 22 is provided so as to block the flow of urine L1 through the tube 14 by blocking the intermediate portion 143 of the tube 14. The blockage state of the tube 14 by the occlusion unit 22 is released when the pump device 20 is driven based on a control signal from the control unit 265, which will be described later. In other words, in this embodiment, the pump device 20 also serves as the occlusion unit 22. Note that the occlusion unit 22 is not limited to being provided on the pump device 20, which is a roller pump. For example, if the pump device 20 is not a roller pump, the occlusion unit 22 is provided separately from the pump device 20.

[0036] As shown in Figure 3, the pressure reaction unit 24 is connected to the second end 144B of the branching unit 144. The pressure reaction unit 24 comprises a box-shaped housing 241, a pressure receiving unit 242, a state change unit 243, and a mounting structure 244.

[0037] The lower surface of the housing 241 is the surface that is attached to the body surface (e.g., skin) of the living organism B (see Figure 4). The housing 241 comprises a first space 301, a second space 302, an introduction port 321, and an exit port 322. The first space 301 is provided inside the housing 241. The first space 301 communicates with the branching portion 144. The introduction port 321 opens into the side wall 341 of the housing 241. The second end portion 144B of the branching portion 144 is inserted through the introduction port 321. Urine L1 that has flowed from the middle portion 143 of the tube 14 to the branching portion 144 flows into the first space 301 through the introduction port 321.

[0038] The second space 302 is a space enclosed by the housing 241. The second space 302 is located inside the housing 241 and is not in communication with the tube 14 (branch section 144). The inside of the second space 302 is filled with gas G. The gas G is, for example, air. The outlet port 322 opens into the side wall 341 of the housing 241 and communicates with the second space 302. The outlet port 322 is connected to one end of the outlet tube 36. When urine L1 flows into the first space 301, urine L1 does not flow into the second space 302. The other end of the outlet tube 36 is connected to the tube connection section 184 of the console 18 (see Figure 1).

[0039] The pressure-receiving section 242 is provided inside the housing 241. The pressure-receiving section 242 is a partition wall that separates the first space 301 and the second space 302. The pressure-receiving section 242 is provided so as to be deformable by receiving the liquid pressure of the urine L1 (collection target L). The pressure-receiving section 242 is an elastically deformable membrane 38. The membrane 38 is an expandable body 381 that can be expanded when fluid (urine) is introduced inside. The expandable body 381 is formed in a bag shape from an elastic material.

[0040] The expandable body 381 is housed in the second space 302 of the housing 241. One end of the expandable body 381 is bonded or fused to the second end 144B of the branch 144. The internal space of the expandable body 381 is the first space 301, which is in communication with the branch 144. Urine L1 is introduced into the internal space (first space 301) of the expandable body 381 through the branch 144. As liquid urine L1 is supplied to the first space 301 of the expandable body 381, the liquid pressure of the urine L1 causes the expandable body 381 to expand outward (see the dashed line shape in Figure 3).

[0041] The state change unit 243 changes its state (parameters) in accordance with the deformation of the pressure receiving unit 242 in order to detect the liquid pressure of the urine L1. The state change unit 243 is the second space 302 of the housing 241, which is filled with gas G. When the expandable body 381 expands within the second space 302, the gas G within the second space 302 is pushed, and the atmospheric pressure of the gas G in the second space 302 changes. In other words, the parameter that changes in the state change unit 243 is the pressure of the gas G. Alternatively, the state change unit 243 may be made liquid-tight in advance with a predetermined liquid, and the pressure change in the state change unit 243 accompanying the change in the pressure receiving unit 242 may be detected using the pressure of the liquid.

[0042] The liquid pressure of the urine L1 applied to the pressure receiving unit 242 is then transmitted as atmospheric pressure of the gas G in the second space 302. The pressure (atmospheric pressure) of the gas G in the second space 302 is transmitted to the pressure detection unit 25 through the outlet port 322 and the outlet tube 36, and the change in atmospheric pressure in the second space 302 is detected as pressure by the pressure detection unit 25 (pressure sensor 25A).

[0043] The mounting structure 244 is provided on the bottom wall 342 of the housing 241 (see Figure 4). As shown in Figure 2, the mounting structure 244 can attach and fix the housing 241 to the body surface (skin, surface) of the living organism B, which is the object to be attached. Note that the object to be attached is not limited to the body surface of living organism B. For example, the object to be attached may be an object worn by living organism B.

[0044] The attachment structure 244 has an attachment part 40 that can be attached to the living body B. The attachment part 40 includes an attachment material 401. As shown in FIG. 3, in a plan view of the pressure reaction part 24, the attachment material 401 is formed in a sheet shape wider than the housing 241. An adhesive surface (not shown) that can be attached to the body surface is provided on the lower surface of the attachment material 401. The adhesive surface may be provided on the entire lower surface of the attachment material 401, or the adhesive surface may be distributed on the lower surface in a form that is easy to stick. Before the pressure reaction part 24 is used, a sheet-shaped backing paper (not shown) is attached to the adhesive surface of the attachment material 401. When fixing the pressure reaction part 24 to the skin, the backing paper not shown is peeled off from the attachment material 401, so that the adhesive surface is exposed. By bringing the adhesive surface into contact with the skin, the housing 241 of the pressure reaction part 24 is fixed to a predetermined position through the attachment material 401. Note that the attachment structure 244 is not limited to a configuration including the attachment part 40. For example, the attachment structure 244 may be a gripping structure that can be fixed by gripping a predetermined part of the living body B.

[0045] As shown in FIG. 2, in the environment where the medical fluid delivery system 10 is used, the pressure reaction part 24 is fixed to the same height as the bladder C1 of the living body B by the attachment structure 244. That is, the pressure reaction part 24 is arranged at the same height as the bladder C1, which is the urine storage site.

[0046] As shown in FIG. 1, the pressure detection part 25 is provided inside the console 18. The pressure (atmospheric pressure) from the pressure reaction part 24 is transmitted to the pressure detection part 25. The pressure detection part 25 can detect the atmospheric pressure transmitted through the lead-out tube 36. The pressure detection part 25 is, for example, a pressure sensor 25A. The pressure detection part 25 is connected to the lead-out tube 36 through the tube connection part 184 of the console 18 and communicates with each other. The atmospheric pressure transmitted from the pressure reaction part 24 through the lead-out tube 36 is detected by the pressure detection part 25. The pressure value detected by the pressure detection part 25 is the intravesical pressure of the bladder C1.

[0047] As shown in FIG. 5, the control device 26 includes an arithmetic unit 261, a storage unit 262, and a communication unit 263. The arithmetic unit 261 is constituted by a processor (such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), etc.), that is, a processing circuit (Processing Circuitry).

[0048] The arithmetic unit 261 has an acquisition unit 264 and a control unit 265. The acquisition unit 264 and the control unit 265 can be realized by executing a program stored in the storage unit 262 by the arithmetic unit 261.

[0049] Note that at least a part of the acquisition unit 264 and the control unit 265 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). Also, at least a part of the acquisition unit 264 and the control unit 265 may be constituted by an electronic circuit including discrete devices.

[0050] The storage unit 262 is constituted by a volatile memory (not shown) and a non-volatile memory (not shown). Examples of the volatile memory include a RAM (Random Access Memory). The volatile memory is used as the working memory of the processor and temporarily stores data and the like necessary for processing or arithmetic operations. Examples of the non-volatile memory include a ROM (Read Only Memory), a flash memory, etc. The non-volatile memory is used as a storage memory and stores programs, tables, maps, etc. At least a part of the storage unit 262 may be provided in the above-described processor, integrated circuit, etc.

[0051] The acquisition unit 264 acquires (calculates) a parameter obtained from the state of the state change unit 243 of the pressure reaction unit 24. In this embodiment, the parameter is pressure. The acquisition unit 264 calculates (acquires) the bladder pressure based on the output signal of the pressure detection unit 25. The storage unit 262 stores the pressure data acquired by the acquisition unit 264. The control unit 265 can release the blockage state of the tube 14 by the blockage unit 22. The control unit 265 analyzes the pressure data acquired by the acquisition unit 264 and stored in the storage unit 262 and outputs it to the display unit 182. The control unit 265 outputs the pressure data to the communication unit 263. The control unit 265 controls the flow of urine L1 by controlling the pump device 20 based on the pressure data received from the acquisition unit 264. That is, the control unit 265 can output a control signal to the pump device 20 for driving control of the pump device 20.

[0052] The medical fluid delivery system 10 is used as follows:

[0053] First, as shown in Figure 2, the pressure-reacting unit 24 is fixed at approximately the same height as the bladder C1 of the patient (body B) lying on bed A. Specifically, by attaching the adhesive surface of the adhesive material 401 to the body surface of body B, the bottom wall 342 of the pressure-reacting unit 24 is in contact with the body surface and fixed at approximately the same height as the bladder C1.

[0054] Next, the tip of the catheter 12 is inserted into the bladder C1 of living organism B. The tip of the catheter 12 is left in place in the bladder C1 through the urethra (not shown). Specifically, the tip of the catheter body 121 and the balloon 122 are positioned inside the bladder C1. Urine L1 in the bladder C1 is introduced into the lumen of the catheter 12.

[0055] Then, the console 18 and the medical bag 16 are placed below the bed A. In the environment in which the medical fluid delivery system 10 is used, the console 18 is positioned vertically above the medical bag 16. In the direction of gravity, the console 18 and the opening (not shown) communicating with the tube 14 are positioned at the same height. After the preparation of the medical fluid delivery system 10 is complete, the user operates the power button 183, which supplies power to the display unit 182 and other parts of the console 18 from a power source (not shown).

[0056] Urine L1 in the bladder C1 flows from the catheter 12 into the tube 14. A portion of the urine L1 flowing through the middle section 143 of the tube 14 is introduced into the expandable body 381 of the pressure-reacting section 24 through the branch section 144 (see Figure 3). As urine L1 is supplied to the first space 301 of the expandable body 381, the expandable body 381, which is the pressure-receiving section 242, elastically deforms and expands within the second space 302 (see the dashed line shape in Figures 3 and 4). The liquid pressure of the urine L1 applied to the inside of the expandable body 381 is transmitted as atmospheric pressure of the gas G in the second space 302. As the expandable body 381 expands, the gas G in the second space 302, which is the state-changing section 243, is compressed and the atmospheric pressure increases.

[0057] As the air pressure in the second space 302 increases, the pressure of the gas G is transmitted from the second space 302 to the pressure detection unit 25 through the outlet port 322 and the outlet tube 36. The change in air pressure in the second space 302 is detected as pressure by the pressure detection unit 25 (pressure sensor 25A). The detected value obtained by the pressure detection unit 25 can be interpreted as bladder pressure. The detected value from the pressure detection unit 25 is output from the pressure detection unit 25 to the acquisition unit 264. The bladder pressure data acquired by the acquisition unit 264 is stored in the storage unit 262.

[0058] Based on the pressure data obtained by the pressure detection unit 25, the control unit 265 controls the operation of the pump device 20. Specifically, the control unit 265 determines whether or not a predetermined amount of urine L1 has accumulated in the bladder C1 based on the bladder pressure data acquired by the acquisition unit 264 and stored in the storage unit 262. When urine L1 has accumulated and the bladder pressure in the bladder C1 exceeds a predetermined pressure (a predetermined value, above the bladder pressure threshold), the pump device 20 receives a control signal from the control unit 265. The control signal drives the pump device 20, and the pump device 20 sends urine L1 from the catheter 12 through the tube 14 to the medical bag 16. When it is determined that a predetermined amount of urine L1 has been introduced into the medical bag 16, the control unit 265 stops the operation of the pump device 20. When the operation of the pump device 20 stops, the delivery of urine L1 from the bladder C1 to the medical bag 16 stops. After a predetermined amount of urine L1 has been collected in the medical bag 16, the pump device 20 stops operating.

[0059] This embodiment provides the following effects.

[0060] As shown in Figure 3, the medical fluid delivery system 10 includes a branch section 144 that branches off from the intermediate section 143 of the tube 14, and a pressure-reacting section 24 connected to the branch section 144. The pressure-reacting section 24 has a pressure-receiving section 242 that can deform in response to the liquid pressure of the sample to be collected L, and a state-changing section 243 whose state changes in accordance with the deformation of the pressure-receiving section 242.

[0061] With this configuration, as shown in Figure 2, the branching section 144 is part of the tube 14 and is relatively flexible and long, allowing for free selection of the installation position of the pressure reaction section 24. Therefore, the pressure reaction section 24 can be easily positioned and fixed at the same height as the bladder C1 of the patient (body B). By positioning the pressure reaction section 24 at the same height as the storage area of ​​the sample target L within body B, changes in the liquid pressure of the sample target L at the generation site can be detected with high accuracy.

[0062] The housing 241 of the pressure reaction section 24 includes a first space 301 that communicates with the branching section 144, and a second space 302 that is a state change section 243 filled with gas G and not communicating with the tube 14. The pressure receiving section 242 is a partition wall separating the first space 301 and the second space 302, and its parameter is the pressure of the gas G.

[0063] With this configuration, the pressure receiving unit 242 transmits the liquid pressure of the sampled object L to the gas G, allowing the liquid pressure of the sampled object L to be detected with a simple configuration based on the pressure of the gas G.

[0064] As shown in Figure 1, the medical fluid delivery system 10 includes a occlusion unit 22 capable of blocking the flow of the sample to be collected L by closing the intermediate portion 143 of the tube 14, and a control unit 265 that controls the state of the tube 14 being blocked by the occlusion unit 22. The control unit 265 releases the blockage of the tube 14 by the occlusion unit 22 when a parameter exceeds a predetermined value.

[0065] With this configuration, the tube 14 can be opened when the amount of sample L increases within the living organism B, thus effectively suppressing the accumulation of sample L within the tube 14.

[0066] As shown in Figure 3, the inner diameter D1 of the branching section 144 is formed to be smaller than the inner diameter D2 of the intermediate section 143. With this configuration, by making the branching section 144 narrower than the intermediate section 143, the inflow of the material to be collected L from the intermediate section 143 to the branching section 144 can be effectively suppressed.

[0067] The pressure receiving section 242 is a membrane 38. With this configuration, the liquid pressure of the sampled object L can be effectively converted to atmospheric pressure and transmitted with a simple structure.

[0068] As shown in Figure 2, the pressure reaction unit 24 is equipped with a mounting structure 244 that can be attached to and fixed to the living organism B. With this configuration, by fixing the pressure reaction unit 24 near the storage area of ​​the sample target L within the living organism B using the mounting structure 244, the liquid pressure of the sample target L can be detected with high accuracy.

[0069] As shown in Figure 4, the mounting structure 244 has an attachment portion 40 that can be attached to the living body B. With this configuration, the pressure-reactive portion 24 can be effectively fixed to the skin of the living body B.

[0070] As shown in Figure 6, the pressure-receiving section 24A according to the first modified example comprises a pressure-receiving section 242A and a state-changing section 243A. The pressure-receiving section 242A is a membrane 38A that divides the housing 241 into a first space 301 and a second space 302. The pressure-receiving section 242A is formed in a sheet shape and is positioned between the bottom wall 342 and the top wall 343 of the housing 241. The first space 301 is the space enclosed by the pressure-receiving section 242A and the bottom wall 342 of the housing 241. The second space 302 is the space enclosed by the pressure-receiving section 242A and the top wall 343 of the housing 241. The first space 301 and the second space 302 are separated in the vertical direction of the housing 241 by the pressure-receiving section 242A.

[0071] The lower part of the housing 241 is provided with an inlet port 321 to which the branch section 144 is connected. The upper part of the housing 241 is provided with an outlet port 322 to which the outlet tube 36 is connected. The branch section 144 and the first space section 301 are in communication through the inlet port 321. The second space section 302 is in communication with the outlet tube 36 through the outlet port 322.

[0072] When urine L1 in the bladder C1 is delivered to the medical bag 16 through the tube 14, a portion of the urine L1 is introduced into the first space 301 of the housing 241 through the branching section 144. The pressure of the urine L1 causes the pressure receiving section 242A to elastically deform toward the second space 302. The elastic deformation of the pressure receiving section 242A pushes the gas G in the second space 302, increasing the air pressure. The change in air pressure in the second space 302 is detected as pressure by the pressure detection section 25 via the discharge tube 36.

[0073] According to the first modified example, the pressure-receiving portion 242A can be made of a sheet-like membrane 38A, thus simplifying the structure.

[0074] As shown in Figure 7, the pressure-receiving section 242B may be composed of a membrane 38B extending vertically from the housing 241, as in the second modified example of the pressure-receiving section 24B. As shown in Figure 8, the pressure-receiving section 242C may be composed of a membrane 38C extending in directions perpendicular to the vertical and width directions of the housing 241. In each of the pressure-receiving sections 24B and 24C described above, the branching section 144 is connected to the first space 301 partitioned by the membranes 38B and 38C, and the outlet tube 36 is connected to the second space 302, which is the state-changing section 243B and 243C.

[0075] As shown in Figure 9, the pressure-receiving section 24D according to the fourth modified example comprises a pressure-receiving section 242D and a state-changing section 243D. The pressure-receiving section 242D is the upper wall 343 of the housing 241. The interior of the housing 241 includes a space 30 into which urine L1 is introduced. The thickness of the upper wall 343 of the housing 241 is thinner than the thickness of the side walls 341 and bottom wall 342 of the housing 241, respectively. When urine L1 is introduced into the space 30, the upper wall 343 of the housing 241 is elastically deformable.

[0076] The state change unit 243D is provided on the outside of the upper wall 343 of the housing 241. A cover member 41 is attached to the upper part of the housing 241. The state change unit 243D consists of a plurality of strain gauges 42. Each of the plurality of strain gauges 42 is arranged spaced apart from each other along the upper wall 343. Each of the plurality of strain gauges 42 and the upper wall 343 is covered by the cover member 41. Each strain gauge 42 detects the elastic deformation of the upper wall 343 when urine L1 is introduced into the space 30. Each strain gauge 42 outputs deformation data to the control device 26 as a detection signal of the deformation of the upper wall 343. In the control device 26, the amount of deformation of the housing 241 is calculated based on the deformation data received from each strain gauge 42. In the control device 26, the pressure of the urine L1 is calculated based on the amount of deformation. That is, the parameter obtained by the state of the state change unit 243D is the amount of deformation of the housing 241. Note that the state change unit 243D is not limited to having multiple strain gauges 42. For example, the state change unit 243D may consist of a single strain gauge 42.

[0077] According to the fourth modification, by configuring the state change unit 243D from a strain gauge 42, the liquid pressure of urine L1 can be detected with a simple configuration. Note that the state change unit 243D is not limited to being composed of a strain gauge 42. For example, the state change unit 243D may be configured with an optical sensor, an ultrasonic sensor, an electrical contact type sensor, etc., to capture changes in the state change unit 243D.

[0078] While this disclosure has been described in detail, it is not limited to the individual embodiments described above. These embodiments can be added, replaced, modified, partially deleted, etc., in any way that does not depart from the gist of this disclosure or from the spirit of this disclosure derived from the claims and their equivalents. These embodiments can also be implemented in combination. For example, the order of operations and processes in the embodiments described above are given as examples only and are not limited thereto. The same applies when numerical values ​​or mathematical formulas are used in the description of the embodiments described above.

Claims

1. A medical fluid delivery system comprising a catheter, a tube connected to the catheter, and a medical bag connected to the tube, for delivering a sample, which is a liquid generated in a living body, to the medical bag through the catheter and the tube, wherein the tube comprises: an inlet end connected to the catheter into which the sample is introduced; an outlet end connected to the medical bag into which the sample is delivered; an intermediate section provided between the inlet end and the outlet end; and a branched section branching off from the intermediate section, wherein the medical fluid delivery system comprises a pressure-reacting section connected to the branched section, the pressure-reacting section having: a pressure-receiving section that can deform upon receiving the fluid pressure of the sample; and a state-changing section whose state changes in accordance with the deformation of the pressure-receiving section in order to detect the fluid pressure, the state of the state-changing section being detectable as a parameter for determining the fluid pressure.

2. A medical fluid delivery system according to claim 1, wherein the pressure reaction unit comprises: a housing; a first space provided inside the housing and communicating with the branching unit; and a second space provided inside the housing and not communicating with the tube, and the state change unit being filled with gas; the pressure receiving unit is a partition wall separating the first space and the second space; and the parameter is the pressure of the gas in the second space.

3. A medical fluid delivery system according to claim 1 or 2, comprising: a occlusion unit capable of blocking the intermediate portion of the tube to block the flow of the object to be collected through the tube; and a control unit that controls the state of the tube being blocked by the occlusion unit, wherein the control unit releases the blockage of the tube by the occlusion unit when the parameter exceeds a predetermined value.

4. A medical fluid delivery system according to claim 1 or 2, wherein the inner diameter of the branching portion is formed to be smaller than the inner diameter of the intermediate portion.

5. A medical fluid delivery system according to claim 2, wherein the pressure receiving part is a membrane.

6. A medical fluid delivery system according to claim 1 or 2, wherein the pressure reaction unit is provided with a mounting structure that can be attached to and fixed to the object to be attached.

7. A medical fluid delivery system according to claim 6, wherein the object to which it is attached is the living body or an object worn by the living body.

8. A medical fluid delivery system according to claim 6, wherein the mounting structure has an adhesive portion that can be attached to the surface of the object to be mounted.

9. A medical fluid delivery system according to claim 1, wherein the state change unit is at least one of a strain gauge, an optical sensor, an ultrasonic sensor, and an electrical contact type sensor.

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