Medical fluid delivery system and medical detection device

Abstract

At least the distal end of a medical detection device (19) is inserted into the body cavity (C) of a living body (B). The medical detection device (19) comprises: an oxygen partial pressure sensor (192) capable of detecting the oxygen partial pressure of a liquid inside the body cavity (C); and a temperature sensor (194) capable of detecting the body cavity internal temperature, which is the temperature inside the body cavity (C). The medical detection device (19) further comprises a pressure transmission unit (193). The pressure transmission unit (193) is disposed inside a catheter (12) inserted into the body cavity (C). The pressure transmission unit (193) has: a pressure receiving part (281) that can be deformed by receiving pressure; and a pressure transmission lumen (282) that can receive, at the pressure receiving part (281), the body cavity internal pressure, and transmit the body cavity internal pressure as air pressure.

Description

Medical fluid delivery system and medical detection device

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

[0002] International Publication No. 2022 / 219578 discloses a medical detection device for delivering a liquid generated in a body cavity of a living body to a medical bag. The medical detection device includes a catheter and a conduit unit that protrudes into the bladder from the tip of the catheter. A pressure sensor capable of detecting the internal pressure in the bladder is provided at the tip of the conduit unit.

[0003] International Publication No. 2022 / 219578

[0004] The internal pressure in the bladder is used to grasp the state of the living body. However, in a medical detection device such as International Publication No. 2022 / 219578, when the tip of the conduit unit is inserted into the bladder, the pressure sensor may contact the inner wall of the bladder, and there is a problem that it is difficult to accurately measure the internal pressure in the bladder by the pressure sensor. Therefore, it is difficult to accurately determine the state of the living body based on the internal pressure in the bladder.

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

[0006] (1) A first aspect of the present disclosure is a medical fluid delivery system including a catheter inserted into the bladder of a living body, a tube connected to the catheter, a medical bag connected to the tube, and a medical detection device that can be inserted into the catheter and acquires information about the living body, wherein the medical detection device includes an oxygen partial pressure sensor capable of detecting the oxygen partial pressure of the liquid in the bladder, a pressure detection unit that detects the internal pressure in the bladder, which is the bladder internal pressure, a temperature sensor capable of detecting the internal temperature in the bladder, which is the bladder internal temperature, and an oxygen partial pressure correction unit that calculates a corrected oxygen partial pressure by correcting the oxygen partial pressure based on at least one of the bladder internal pressure and the bladder internal temperature.

[0007] This medical fluid delivery system allows for accurate detection of the intravesical bladder pressure by correcting the partial pressure of oxygen in the fluid within the body cavity and calculating the corrected partial pressure of oxygen, along with the intravesical bladder pressure and bladder temperature.

[0008] (2) In the medical fluid delivery system described in (1) above, the system may have a pressure transmission unit comprising a pressure receiving unit disposed within the catheter and deformable upon receiving pressure, and a pressure transmission lumen that receives the intrabladder pressure at the pressure receiving unit and transmits it as a gauge pressure in order to detect the intrabladder pressure, wherein the pressure detection unit may detect the pressure transmitted by the pressure transmission unit.

[0009] This configuration allows the bladder pressure received by the pressure-receiving section to be effectively transmitted as gauge pressure to the pressure detection section, thereby enabling pressure detection.

[0010] (3) The medical fluid delivery system described in (1) or (2) above further comprises a delivery unit connected to the tube and capable of delivering the liquid in the tube toward the medical bag, and a control unit that controls the delivery unit, wherein the control unit may deliver the liquid in the tube by the delivery unit when the bladder pressure rises above a predetermined pressure.

[0011] This configuration allows the delivery unit to effectively deliver the fluid to the medical bag when the amount of fluid in the bladder increases.

[0012] (4) In the medical fluid delivery system described in any one of (1) to (3) above, the catheter has a urinary tract which is a passage for the liquid urine, and the medical fluid delivery system may further include a flow rate measuring unit capable of detecting the flow rate of the urine in the urinary tract.

[0013] This configuration allows for effective monitoring of the amount of urine being transferred from the bladder to the medical bag.

[0014] (5) The medical fluid delivery system described in (4) above may include a prediction unit that predicts the risk of developing acute kidney injury based on the flow rate, the corrected oxygen partial pressure, the intravesical pressure, and the intravesical temperature.

[0015] This configuration allows for the prediction of the risk of developing acute kidney injury based on urine flow rate, corrected oxygen partial pressure, bladder pressure, and bladder temperature, and can therefore be used to prevent acute kidney injury.

[0016] (6) A second aspect of the present disclosure is a medical detection device for acquiring information about a living organism, the tip of which is inserted into a body cavity of the living organism, the medical detection device comprising: an oxygen partial pressure sensor capable of detecting the partial pressure of oxygen in a liquid within the body cavity; a pressure receiving section disposed within a catheter inserted into the body cavity and deformable upon receiving pressure; a pressure transmission lumen capable of receiving the intra-body cavity pressure at the pressure receiving section and transmitting it as a gauge pressure in order to detect the intra-body cavity pressure, which is the pressure within the body cavity; and a temperature sensor capable of detecting the intra-body cavity temperature, which is the temperature within the body cavity.

[0017] This medical detection device allows for effective assessment of a living organism's condition by detecting the partial pressure of oxygen in the fluid within the body cavity, the intra-body cavity pressure, and the intra-body cavity temperature.

[0018] (7) The medical detection device described in (6) above may be provided with an oxygen partial pressure correction unit that corrects the oxygen partial pressure based on at least one of the intra-body cavity pressure and the intra-body cavity temperature to calculate a corrected oxygen partial pressure.

[0019] This configuration allows for correction of the oxygen partial pressure based on at least one of intra-body cavity pressure and intra-body cavity temperature, enabling more effective assessment of the body's condition based on the corrected oxygen partial pressure. When the tip of the medical detection device is placed in the body cavity, the pressure transmission part does not come into contact with the bladder wall, allowing the pressure detection part to accurately detect the bladder pressure.

[0020] (8) The medical detection device described in (6) or (7) above may include a shaft that supports at least the oxygen partial pressure sensor and the pressure transmission unit and is insertable into the catheter.

[0021] This configuration integrates the oxygen partial pressure sensor and pressure transmission unit via a shaft, resulting in excellent catheter insertion.

[0022] (9) In the medical detection device described in (8) above, the shaft may be provided with a connector that connects to the catheter hub of the catheter when the medical detection device is inserted into the catheter.

[0023] This configuration improves the ease of insertion into living organisms.

[0024] (10) In the medical detection device described in any one of (6) to (9) above, the oxygen partial pressure sensor may be a fluorescent sensor.

[0025] (11) In the medical detection device described in any one of (6) to (10) above, the pressure receiving part may be a membrane.

[0026] This configuration allows for the implementation of a pressure-receiving section with a simple structure.

[0027] (12) In the medical detection device described in any one of (6) to (11) above, the body cavity is the bladder of the living organism, the liquid is the urine of the living organism, the oxygen partial pressure sensor is capable of detecting the oxygen partial pressure of the urine in the bladder, the pressure transmission unit is capable of transmitting the pressure in the bladder, and the temperature sensor is capable of detecting the temperature in the bladder.

[0028] This configuration allows for effective assessment of the bladder's condition in the body by detecting the partial pressure of oxygen in the bladder fluid, the intra-body pressure within the bladder, and the temperature within the bladder.

[0029] According to this disclosure, a medical detection device for acquiring information about living organisms can effectively determine the state of a living organism by detecting the partial pressure of oxygen in the fluid within the body cavity, the intra-body cavity pressure, and the intra-body cavity temperature. Furthermore, in a medical fluid delivery system, by correcting the partial pressure of oxygen in the fluid within the body cavity and calculating the corrected partial pressure of oxygen, the intra-bladder pressure of a living organism can be accurately detected from the corrected partial pressure of oxygen, the intra-bladder pressure, and the intra-bladder temperature.

[0030] Figure 1 is a perspective view of a medical fluid delivery system according to the first embodiment of this disclosure. Figure 2 is an explanatory diagram of how to use the medical fluid delivery system. Figure 3 is a configuration diagram of the medical fluid delivery system shown in Figure 1. Figure 4 is a cross-sectional view of a medical detection device. Figure 5 is a cross-sectional view along the line V-V in Figure 4. Figure 6 is a block diagram of the medical fluid delivery system. Figure 7 is a flowchart illustrating how to use the medical fluid delivery system. Figure 8A is a cross-sectional view of a medical detection device according to a first modified example. Figure 8B is a cross-sectional view of a medical detection device according to a second modified example. Figure 8C is a cross-sectional view of a medical detection device according to a third modified example. Figure 9A is a cross-sectional view of a medical detection device according to a fourth modified example. Figure 9B is a cross-sectional view along the line IXB-IXB in Figure 9A. Figure 10A is a cross-sectional view of a medical detection device according to a fifth modified example. Figure 10B is a cross-sectional view along the line XB-XB in Figure 10A. Figure 11 is a perspective view of a medical fluid delivery system according to the second embodiment of this disclosure. Figure 12 is a diagram showing the configuration of the status monitoring unit of the medical fluid delivery system shown in Figure 11.

[0031] As shown in Figure 1, the medical fluid delivery system 10 according to the first embodiment is a medical device for delivering a sample target L (see Figure 2), which is a liquid generated in the body cavity C of a living organism B (see Figure 2), to a medical bag 16 via a tube 14. As shown in Figure 2, the medical fluid delivery system 10 is used, for example, to deliver urine L1 from the bladder C1 of living organism B to a 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 living organism B.

[0032] 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 medical detection device 19.

[0033] As shown in Figure 2, the catheter 12 is inserted into the body B (bladder C1) and left in place when in use. The catheter 12 is a medical device for draining urine L1 from the bladder C1 into a medical bag 16 placed outside the body. As shown in Figure 3, the catheter 12 comprises a hollow catheter body 121, a balloon 122 provided at the tip of the catheter body 121, a catheter hub 123, a urinary tract 124 (see Figure 4), and a flange portion 125 (see Figure 4).

[0034] As shown in Figure 4, the catheter body 121 has a lumen 121A and a urinary drainage port 121B. The lumen 121A is the urinary tract 124, which is the flow path for urine L1. The urinary tract 124 extends along the axial direction of the catheter 12. The urinary drainage port 121B opens at the tip of the catheter body 121. The urinary drainage port 121B communicates with the urinary tract 124. As shown in Figure 2, when the tip of the catheter 12 is inserted into the bladder C1, urine L1 in the bladder C1 flows from the urinary drainage port 121B into the urinary tract 124. In the axial direction of the catheter 12, the urinary drainage port 121B is positioned further forward than the balloon 122 (see Figure 3).

[0035] As shown in Figure 3, the catheter hub 123 is provided at the proximal end of the catheter body 121. The catheter hub 123 includes a first port 1231, a second port 1232, and a third port 1233. Each of the first port 1231, the second port 1232, and the third port 1233 opens toward the proximal end of the catheter 12. Each of the first port 1231, the second port 1232, and the third port 1233 communicates with the urinary tract 124. A tube 14 is connected to the first port 1231. A medical detection device 19, which will be described later, is inserted into the second port 1232. As shown in Figure 4, the flange portion 125 is provided at the proximal end of the second port 1232. The flange portion 125 protrudes radially outward from the outer circumferential surface of the second port 1232.

[0036] As shown in Figure 1, the tube 14 is flexible and connected to the catheter 12. As shown in Figure 3, the tube 14 has an inlet end 141, an outlet end 142, and an intermediate section 143. The inlet end 141 is located at the tip of the tube 14 in the extending direction and is open. The inlet end 141 is connected to the first port 1231 of the catheter hub 123. Urine L1 from the bladder C1 is introduced into the tube 14 from the catheter 12 through the inlet end 141.

[0037] 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.

[0038] The medical bag 16 is a closed bag configured as a urine collection bag. The medical bag 16 is connected to the tube 14. The medical bag 16 comprises a bag body 161 and an introduction tube 162. The medical bag 16 is made of, 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.

[0039] 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, and a power button 183. 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.

[0040] The housing 181 is formed in a box shape. The intermediate portion 143 of the tube 14 is housed inside the housing 181. The intermediate portion 143 of the tube 14 is removed from the top of the housing 181 and exposed to the outside.

[0041] The display unit 182 is provided on the front surface of the housing 181. The display unit 182 includes a display D capable of displaying detection results and the like by the medical detection device 19. The display D may be a touch panel. The power button 183 is provided on the front surface of the housing 181. By the user operating the power button 183, the power supply to the display unit 182 and the transmission unit 20 described later can be switched.

[0042] Inside the console 18, a transmission unit 20 is provided. The transmission unit 20 is connected to the middle portion 143 of the tube 14. The transmission unit 20 can transmit the urine L1 in the tube 14 toward the medical bag 16. The transmission unit 20 includes a pump device 20P. By supplying power from a power source (not shown) to the pump device 20P, the urine L1 in the tube 14 is transmitted toward the medical bag 16. The pump device 20P is, for example, a roller pump. By supplying power from a power source (not shown) to the pump device 20P, a liquid delivery unit (not shown) rotates to sequentially press the tube 14, thereby transmitting the urine L1 in the tube 14 toward the medical bag 16.

[0043] The medical detection device 19 can be inserted inside the catheter 12. The medical detection device 19 is used to acquire information regarding the living body B. The tip of the medical detection device 19 is inserted into the bladder C1 of the living body B.

[0044] As shown in FIG. 4, the medical detection device 19 includes a hollow shaft 191, an oxygen partial pressure sensor 192, a pressure transmission unit 193, and a temperature sensor 194.

[0045] The shaft 191 is formed to be long along the axial direction. The shaft 191 supports each of the oxygen partial pressure sensor 192, the pressure transmission unit 193, and the temperature sensor 194. The shaft 191 is provided so as to be insertable into the lumen 121A (urinary tract 124) of the catheter 12. The shaft 191 includes a sensor lumen 221 and a connector 222. Note that the temperature sensor 194 may not be provided on the shaft 191.

[0046] The sensor lumen 221 is formed in a ring shape and extends along the axial direction of the shaft 191 (see FIG. 5). At the tip of the shaft 191, the sensor lumen 221 opens. A part of the oxygen partial pressure sensor 192 and the temperature sensor 194 is accommodated and supported in the sensor lumen 221. The tip of the sensor lumen 221 has a seal structure 24. The seal structure 24 is formed of, for example, an elastic material and contacts the inner peripheral surface of the shaft 191. The seal structure 24 prevents the flow of liquid from the tip of the sensor lumen 221 toward the base end.

[0047] The connector 222 is connected to the catheter hub 123 (second port 1232) of the catheter 12 in a state where the shaft 191 of the medical detection device 19 is inserted into the catheter 12. The connector 222 is provided on the outer peripheral portion of the base end of the shaft 191. The connector 222 projects radially outward from the outer peripheral portion of the shaft 191.

[0048] The connector 222 includes a protruding portion 261 and an engaging portion 262. The protruding portion 261 projects radially outward from the outer peripheral portion of the shaft 191. The engaging portion 262 extends in the axial direction of the shaft 191 from the end of the protruding portion 261. The extending direction of the engaging portion 262 is the tip direction with respect to the protruding portion 261. The engaging portion 262 is formed substantially parallel to the axial direction of the shaft 191. The inner peripheral surface of the engaging portion 262 has a convex portion 262A. In a state where the shaft 191 of the medical detection device 19 is inserted into the catheter 12, the convex portion 262A of the engaging portion 262 is arranged in the tip direction with respect to the flange portion 125 of the catheter hub 123. The convex portion 262A and the flange portion 125 are engaged with each other in the axial direction of the catheter 12. Thereby, the shaft 191 and the catheter 12 are connected to each other. Relative movement of the shaft 191 in the axial direction with respect to the catheter 12 is prevented, and the oxygen partial pressure sensor 192, the pressure transmission portion 193, and the temperature sensor 194 can be positioned at a predetermined relative position with respect to the catheter 12. Incidentally, the catheter 12 and the medical detection device 19 may be relatively rotatable with respect to each other via the connector 222.

[0049] The medical detection device 19 is not limited to a configuration that includes a connector 222. For example, any fixing structure that can prevent relative movement of the catheter 12 and the medical detection device 19 when the medical detection device 19 is inserted into the catheter 12 is acceptable. For example, a connector made of a separate component from the medical detection device 19 may be inserted into the proximal end of the catheter 12, and the fixing structure that prevents relative movement of the catheter 12 and the medical detection device 19 by connecting to the connector may also be acceptable.

[0050] The oxygen partial pressure sensor 192 detects the oxygen partial pressure of urine L1 (liquid) in the bladder C1 (body cavity C). The oxygen partial pressure sensor 192 is configured as a fluorescent oxygen sensor. The oxygen partial pressure sensor 192 comprises an oxygen sensor body 192A and an oxygen transmission unit 192B. The oxygen sensor body 192A includes a glass optical fiber or a plastic optical fiber. In this case, the core of the glass optical fiber or plastic optical fiber is exposed on the tip surface of the oxygen sensor body 192A. The tip of the oxygen sensor body 192A is exposed in the sensor lumen 221. The tip of the oxygen sensor body 192A and the shaft 191 are positioned at the same location. The oxygen partial pressure sensor 192 is supported in the sensor lumen 221 by a protective tube 27. The oxygen transmission unit 192B is electrically connected to the oxygen sensor body 192A. The oxygen transmission unit 192B is a cable for optically connecting the oxygen sensor body 192A and the control device 34.

[0051] The oxygen partial pressure sensor 192 is not limited to being composed of a fluorescent oxygen sensor. For example, the oxygen partial pressure sensor 192 may be configured as an electrode-type oxygen sensor. In the sensor lumen 221, the oxygen transmission unit 192B is supported by a seal structure 24. The seal structure 24 prevents the flow of liquid between the oxygen transmission unit 192B and the sensor lumen 221. The seal structure 24 is positioned in the sensor lumen 221 toward the base end of the oxygen sensor body 192A.

[0052] The pressure transmission unit 193 comprises a pressure transmission tube 280, a pressure receiving unit 281, and a pressure transmission lumen 282. The pressure transmission tube 280 is inserted into the lumen of the shaft 191. The pressure transmission tube 280 extends along the axial direction of the shaft 191. As shown in Figure 5, the pressure transmission tube 280 is positioned at the center of the shaft 191. The pressure transmission tube 280 is surrounded by the sensor lumen 221. The pressure transmission tube 280 is exposed to the outside from the base end of the shaft 191. The base end of the pressure transmission tube 280 is connected to a pressure detection unit 30, which will be described later.

[0053] The pressure-receiving portion 281 is formed to be deformable when subjected to pressure. The pressure-receiving portion 281 is provided at the tip of the pressure transmission tube 280 (see Figure 4). The pressure-receiving portion 281 is positioned inside the catheter body 121 when the shaft 191 of the medical detection device 19 is inserted into the catheter 12. That is, the pressure-receiving portion 281 is positioned more towards the proximal end than the tip of the catheter body 121. The pressure-receiving portion 281 does not protrude further towards the tip than the tip of the catheter body 121. However, the pressure-receiving portion 281 may protrude further towards the tip than the tip of the catheter body 121. In addition, at least a part of the pressure-receiving portion 281 may be formed to extend into the interior (proximal end direction) of the pressure transmission lumen 282.

[0054] The pressure-receiving portion 281 is a sheet-like membrane 281A that can be deformed when subjected to pressure. The membrane 281A is formed from an elastic material such as silicone. However, the pressure-receiving portion 281 is not limited to being a membrane 281A. For example, the pressure-receiving portion 281 may be a balloon formed in the shape of a bag. The outer edge of the membrane 281A is fixed to the tip of the shaft 191. The membrane 281A is elastically deformable in the axial direction of the shaft 191, with the outer edge acting as a fulcrum. The membrane 281A may be formed from a non-stretchable material. Furthermore, it is even more preferable that the membrane 281A is pre-shaped to facilitate deformation. The shape of the membrane 281A may be, for example, spherical, uneven, convex inward, convex outward, etc. It is preferable that the shape of the membrane 281A is such that it is easy to install on the pressure transmission tube 280 and efficient when subjected to pressure. With this configuration, when the pressure-receiving section 281 (membrane 281A) receives pressure, it becomes possible to stably and efficiently transmit the pressure to the pressure detection section 30 through the pressure transmission lumen 282, even with small pressure changes.

[0055] The pressure transmission lumen 282 is located inside the pressure transmission tube 280. The pressure transmission lumen 282 extends along the axial direction of the pressure transmission tube 280. As shown in Figure 5, the pressure transmission lumen 282 and the sensor lumen 221 are separated by the pressure transmission tube 280. As shown in Figure 4, the pressure transmission lumen 282 opens at the tip of the pressure transmission tube 280. A pressure receiving portion 281 is provided at the tip of the pressure transmission lumen 282. The end of the pressure transmission lumen 282 is covered by the pressure receiving portion 281. The pressure receiving portion 281 makes the pressure transmission lumen 282 airtight.

[0056] With the shaft 191 and pressure transmission tube 280 of the medical detection device 19 inserted into the catheter 12, the pressure transmission lumen 282 transmits the intravesical pressure, which is the pressure inside the bladder C1 received by the pressure receiving section 281, as gauge pressure towards the proximal end. Here, gauge pressure refers to pressure transmitted by gas or liquid, etc. Note that the pressure receiving section 281 is not limited to being located at the tip of the pressure transmission lumen 282 (pressure transmission tube 280). For example, the pressure receiving section 281 may be positioned in the direction from the tip to the proximal end of the pressure transmission lumen 282 (pressure transmission tube 280). The pressure receiving section 281 prevents the flow of fluid such as gas or liquid from the tip to the proximal end of the pressure transmission lumen 282. In other words, the pressure receiving section 281 also functions as a seal structure that prevents the flow of liquid within the pressure transmission lumen 282.

[0057] As shown in Figure 3, the medical fluid delivery system 10 further includes a pressure detection unit 30. The pressure detection unit 30 is located inside the console 18. The pressure (gauge pressure) from the pressure transmission unit 193 of the medical detection device 19 is transmitted to the pressure detection unit 30. The pressure detection unit 30 is connected to the base end of the pressure transmission tube 280. The pressure detection unit 30 is capable of detecting the gauge pressure transmitted through the pressure transmission lumen 282 of the pressure transmission tube 280. The pressure detection unit 30 is, for example, a pressure sensor 30A. The pressure value detected by the pressure detection unit 30 is the intravesical pressure of the bladder C1.

[0058] The temperature sensor 194 detects the bladder temperature (body cavity temperature), which is the temperature inside the bladder C1 (body cavity C). The temperature sensor 194 comprises a temperature sensor body 194A and a temperature transmission unit 194B. The temperature sensor body 194A is positioned between the oxygen sensor body 192A and the balloon 122. That is, the temperature sensor body 194A is positioned further towards the base than the oxygen sensor body 192A. The temperature sensor body 194A is covered by a seal structure 24. The temperature sensor body 194A is not exposed in the sensor lumen 221. The temperature transmission unit 194B is a cable for electrically connecting the temperature sensor body 194A and the display unit 182. The temperature transmission unit 194B is positioned in parallel with the oxygen transmission unit 192B in the sensor lumen 221.

[0059] The oxygen transmission unit 192B, the pressure transmission tube 280, and the temperature transmission unit 194B are each taken out from the proximal end of the shaft 191 toward the proximal end. Each of the oxygen transmission unit 192B, the pressure transmission tube 280, and the temperature transmission unit 194B are taken out from the second port 1232 of the catheter hub 123 toward the outside of the catheter 12. Each of the oxygen transmission unit 192B, the pressure transmission tube 280, and the temperature transmission unit 194B are combined into a single sensor transmission unit 32 toward the proximal end of the shaft 191. The sensor transmission unit 32 extends from the shaft 191 to the console 18. The sensor transmission unit 32 is connected to the sensor connection unit 184 of the console 18. The connection of the sensor transmission unit 32 and the sensor connection unit 184 electrically connects the oxygen partial pressure sensor 192 and the temperature sensor 194 to the control device 34 (see Figure 1). The pressure transmission unit 193 is connected to the pressure detection unit 30 (pressure sensor 30A). Note that the oxygen transmission unit 192B, the pressure transmission tube 280, and the temperature transmission unit 194B are not limited to being combined by the sensor transmission unit 32. For example, the oxygen transmission unit 192B, the pressure transmission tube 280, and the temperature transmission unit 194B may each extend independently to and be connected to the control device 34.

[0060] The medical detection device 19 is not limited to a configuration that includes a shaft 191. For example, the oxygen partial pressure sensor 192, the pressure transmission unit 193, and the temperature sensor 194 may each be inserted into the catheter 12.

[0061] As shown in Figure 3, the medical fluid delivery system 10 further includes a control device 34 and a flow rate measuring unit 36. The control device 34 (see Figure 1) and the flow rate measuring unit 36 ​​are each housed inside the casing 181 of the console 18. Note that the medical fluid delivery system 10 does not necessarily have to include the flow rate measuring unit 36.

[0062] As shown in Figure 6, the control device 34 comprises an arithmetic unit 341, a storage unit 342, and a communication unit 343. The arithmetic unit 341 is composed of a processor, such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), i.e., a processing circuit.

[0063] The calculation unit 341 includes an acquisition unit 344, a control unit 345, an oxygen partial pressure correction unit 346, and a prediction unit 347. The acquisition unit 344, the control unit 345, the oxygen partial pressure correction unit 346, and the prediction unit 347 can be realized by the calculation unit 341 executing a program stored in the storage unit 342.

[0064] Furthermore, at least a portion of the acquisition unit 344, control unit 345, oxygen partial pressure correction unit 346, and prediction unit 347 may be implemented by integrated circuits such as ASICs (Application Specific Integrated Circuits) and FPGAs (Field-Programmable Gate Arrays). Alternatively, at least a portion of the acquisition unit 344, control unit 345, oxygen partial pressure correction unit 346, and prediction unit 347 may be configured by electronic circuits including discrete devices.

[0065] The storage unit 342 is composed of a volatile memory (not shown) and a non-volatile memory (not shown). Examples of volatile memory include RAM (Random Access Memory). The volatile memory is used as the working memory of the processor and temporarily stores data necessary for processing or calculation. Examples of non-volatile memory include ROM (Read Only Memory) and flash memory. The non-volatile memory is used as storage memory and stores programs, tables, maps, etc. At least a part of the storage unit 342 may be provided in the processor, integrated circuit, etc. as described above.

[0066] The acquisition unit 344 calculates (acquires) the oxygen partial pressure based on the output signal from the oxygen partial pressure sensor 192. The acquisition unit 344 calculates (acquires) the bladder temperature (intra-body cavity temperature) based on the output signal from the temperature sensor 194. The acquisition unit 344 calculates (acquires) the bladder pressure (intra-body cavity pressure) based on the output signal from the pressure detection unit 30 (pressure sensor 30A). The storage unit 342 stores the oxygen partial pressure data, bladder temperature data, and bladder pressure data acquired by the acquisition unit 344.

[0067] The control unit 345 drives the delivery unit 20 based on the bladder pressure data acquired by the acquisition unit 344. When the bladder pressure rises above a predetermined pressure, the control unit 345 outputs a control signal to the delivery unit 20. The pump device 20P is driven to deliver the urine L1 in the tube 14 towards the medical bag 16. The control unit 345 outputs the oxygen partial pressure data, bladder temperature data, and bladder pressure data acquired by the acquisition unit 344 to the display unit 182. The oxygen partial pressure data, bladder temperature data, and bladder pressure data are each output to the communication unit 343.

[0068] The oxygen partial pressure correction unit 346 corrects the oxygen partial pressure based on bladder pressure and bladder temperature. Specifically, the oxygen partial pressure correction unit 346 calculates the corrected oxygen partial pressure by correcting the oxygen partial pressure from the bladder pressure data and bladder temperature data acquired by the acquisition unit 344. However, the oxygen partial pressure correction unit 346 is not limited to correcting the oxygen partial pressure based on bladder pressure data and bladder temperature data. The oxygen partial pressure correction unit 346 may correct the oxygen partial pressure based on either the bladder pressure data or the bladder temperature data. The corrected oxygen partial pressure is acquired by the acquisition unit 344 and stored in the storage unit 342.

[0069] The oxygen partial pressure correction unit 346 can perform corrections according to the intrabladder pressure and intrabladder temperature using, for example, the correction method described below. However, it is not limited to this correction method. For example, it can be revised using the correction method according to the values ​​obtained by the medical detection device 19.

[0070]

[0071] As shown in Figure 3, the flow rate measuring unit 36 ​​detects the flow rate of urine L1 in the urinary tract 124 of the catheter 12. The flow rate measuring unit 36 ​​is provided in the intermediate section 143 of the tube 14. The flow rate measuring unit 36 ​​can measure the flow rate of urine L1 flowing through the intermediate section 143. The flow rate measuring unit 36 ​​is connected to the intermediate section 143 downstream of the delivery section 20. Alternatively, the flow rate measuring unit 36 ​​may be connected to the tube 14 upstream of the delivery section 20.

[0072] As shown in Figure 6, the prediction unit 347 predicts the risk of acute kidney injury in living organism B based on the flow rate of urine L1 measured by the flow rate measurement unit 36, the corrected oxygen partial pressure corrected by the oxygen partial pressure correction unit 346, the intrabladder pressure detected by the pressure detection unit 30 (described later), and the intrabladder temperature detected by the temperature sensor 194. The control unit 345 displays the risk of onset predicted by the prediction unit 347 on the display unit 182.

[0073] The medical fluid delivery system 10 is used as follows:

[0074] First, as shown in Figure 2, the tip of the catheter 12 is inserted into the bladder C1 of the patient B, who is lying on bed A. 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 from the bladder C1 is introduced into the urinary tract 124 through the urinary drainage port 121B.

[0075] Next, the sensor transmission unit 32 of the medical detection device 19 is connected to the sensor connection unit 184 of the console 18. This electrically connects the oxygen partial pressure sensor 192 and the temperature sensor 194 to the control device 34. The pressure transmission unit 193 is connected to the pressure detection unit 30.

[0076] The console 18 and medical bag 16 are placed below bed A on which the patient (body B) lies. 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.

[0077] Next, the shaft 191 of the medical detection device 19 is inserted through the second port 1232 of the catheter hub 123. A pressure transmission tube 280 is already inserted into the lumen of the shaft 191. The shaft 191 is routed through the urinary tract 124 of the catheter 12 toward the tip of the catheter body 121. As shown in Figure 4, with the shaft 191 housed in the lumen 121A of the catheter 12, the flange portion 125 of the catheter 12 and the connector 222 are engaged with each other. The shaft 191 of the medical detection device 19 and the catheter 12 are then fixed together.

[0078] Then, after the medical fluid delivery system 10 is ready, the user operates the power button 183. This supplies power to the display unit 182 and other parts of the console 18 from a power source (not shown). The medical detection device 19 starts measuring urine L1. Within the urinary tract 124 of the catheter 12, the tip and outer circumference of the shaft 191 each come into contact with the urine L1. Specifically, the oxygen partial pressure sensor 192 (oxygen sensor body 192A) and the pressure receiving part 281 of the pressure transmission unit 193 each come into contact with the urine L1. The temperature sensor body 194A of the temperature sensor 194 is not in contact with the urine L1 due to the seal structure 24.

[0079] The pressure transmission unit 193 and the pressure detection unit 30 measure the intravesical pressure, which is the pressure inside the bladder C1. The urine L1 in the urinary tract 124 pushes the pressure-receiving part 281 of the pressure transmission unit 193 toward the proximal end (see the dashed line shape in Figure 4). The pressure received by the pressure-receiving part 281 (membrane 281A) is the fluid pressure of the urine L1. The membrane 281A of the pressure-receiving part 281 elastically deforms so as to curve toward the proximal end relative to the tip of the shaft 191. Due to the elastic deformation of the pressure-receiving part 281, the air in the pressure transmission lumen 282 is pushed toward the proximal end.

[0080] The liquid pressure of the urine L1 applied to the pressure receiving unit 281 is transmitted as air pressure (corresponding to gauge pressure) in the pressure transmission lumen 282. The air in the pressure transmission lumen 282 is transmitted as air pressure to the pressure detection unit 30 through the pressure transmission tube 280. The change in air pressure in the pressure transmission lumen 282 of the pressure transmission tube 280 is detected as pressure by the pressure detection unit 30 (pressure sensor 30A). The detected value obtained by the pressure detection unit 30 is the bladder pressure. The detected value (bladder pressure) from the pressure detection unit 30 is output as an output signal and received by the acquisition unit 344. The bladder pressure data acquired by the acquisition unit 344 is stored in the storage unit 342.

[0081] The control unit 345 determines, based on the bladder pressure data acquired by the acquisition unit 344 and stored in the storage unit 342, whether or not urine L1 has accumulated in the bladder C1 and whether or not a predetermined amount of urine L1 has accumulated. Specifically, the control unit 345 determines whether or not the bladder pressure is above the bladder pressure threshold. When urine L1 has accumulated and the bladder pressure in the bladder C1 exceeds a predetermined pressure (above the bladder pressure threshold), the control unit 345 outputs a control signal to the pump device 20P of the delivery unit 20. The control signal drives the pump device 20P, and the pump device 20P delivers urine L1 from the urinary tract 124 of the catheter 12 through the tube 14 to the medical bag 16.

[0082] When urine L1 is delivered from the catheter 12 to the medical bag 16, the flow rate of the urine L1 is measured by the flow rate measurement unit 36. The flow rate of urine L1 measured by the flow rate measurement unit 36 ​​is output to the acquisition unit 344 and stored in the storage unit 342 (see Figure 6).

[0083] In the oxygen partial pressure sensor 192, the oxygen sensor body 192A detects oxygen in the urine flowing through the urinary tract 124. The temperature sensor 194 detects the temperature of the urine L1 in the bladder C1 or the temperature inside the bladder C1. The acquisition unit 344 receives the detected value (oxygen partial pressure) from the oxygen partial pressure sensor 192 and the detected value (bladder temperature) from the temperature sensor 194, respectively (step S1 in Figure 7). The oxygen partial pressure data and bladder temperature data acquired by the acquisition unit 344 are stored in the storage unit 342, respectively.

[0084] Next, the oxygen partial pressure correction unit 346 of the calculation unit 341 corrects the acquired oxygen partial pressure (step S2 in Figure 7). Specifically, the oxygen partial pressure correction unit 346 calculates a corrected oxygen partial pressure by correcting the oxygen partial pressure based on the bladder pressure data and bladder temperature data stored in the storage unit 342. Note that the corrected oxygen partial pressure is not limited to being calculated based on both the bladder pressure data and the bladder temperature data. For example, the corrected oxygen partial pressure may be calculated based on only one of the bladder pressure data or the bladder temperature data. The corrected oxygen partial pressure is acquired by the acquisition unit 344 and stored in the storage unit 342 (step S3 in Figure 7). The corrected oxygen partial pressure data, bladder temperature data, and bladder pressure data calculated by the oxygen partial pressure correction unit 346 are each displayed on the display D of the display unit 182 (step S4).

[0085] Next, in step S5, the prediction unit 347 predicts the risk of acute kidney injury (AKI) in living organism B. Specifically, the prediction unit 347 compares the urine flow rate data, corrected oxygen partial pressure data, bladder pressure data, and bladder temperature data stored in the memory unit 342 with the data (flow rate data, oxygen partial pressure data, bladder pressure data, and bladder temperature data) from pre-set cases of onset in the memory unit 342. The risk of developing acute kidney injury is shown in multiple stages, for example, according to the probability of onset.

[0086] The first embodiment provides the following effects.

[0087] As shown in Figure 1, the medical fluid delivery system 10 includes a medical detection device 19 for acquiring information about the living organism B. As shown in Figure 4, the medical detection device 19 includes an oxygen partial pressure sensor 192, a pressure transmission unit 193, a temperature sensor 194, and an oxygen partial pressure correction unit 346 (see Figure 6).

[0088] With this configuration, by correcting the partial pressure of oxygen in the fluid within body cavity C and calculating the corrected partial pressure of oxygen, the intrabladder pressure of living organism B can be accurately detected from the corrected partial pressure of oxygen, intrabladder pressure, and intrabladder temperature.

[0089] As shown in Figure 4, the medical detection device 19 has a pressure transmission unit 193 which includes a pressure receiving unit 281 positioned inside the catheter 12 and deformable when subjected to pressure, and a pressure transmission lumen 282 which receives the intra-body pressure, which is the pressure inside the body cavity, at the pressure receiving unit 281 and transmits it as gauge pressure in order to detect intra-body pressure. The pressure detection unit 30 detects the pressure transmitted by the pressure transmission unit 193.

[0090] This configuration allows the intra-body cavity pressure (bladder pressure) received by the pressure receiving unit 281 to be effectively transmitted as gauge pressure to the pressure detection unit 30 via the pressure receiving unit 281, thereby enabling pressure detection.

[0091] As shown in Figure 3, the system includes a discharge unit 20 capable of delivering urine L1 in the tube 14 toward the medical bag 16, and a control unit 345 (see Figure 6) that controls the discharge unit 20. The control unit 345 discharges the urine L1 in the tube 14 via the discharge unit 20 when the bladder pressure rises above a predetermined pressure.

[0092] With this configuration, when the amount of urine in the bladder C1 increases, the delivery unit 20 can effectively deliver the urine L1 to the medical bag 16.

[0093] The medical fluid delivery system 10 includes a flow rate measuring unit 36 ​​capable of detecting the flow rate of urine L1 within the urinary tract 124.

[0094] This configuration allows for effective confirmation of the amount of urine L1 being transferred from the bladder C1 to the medical bag 16.

[0095] As shown in Figure 6, the system includes a prediction unit 347 that predicts the risk of developing acute kidney injury based on the flow rate of urine L1, corrected oxygen partial pressure, bladder pressure, and bladder temperature.

[0096] This configuration allows for the prediction of the risk of acute kidney injury based on urine L1 flow rate, corrected oxygen partial pressure, bladder pressure, and bladder temperature, and can therefore be used to prevent acute kidney injury.

[0097] As shown in Figure 4, the medical detection device 19 includes an oxygen partial pressure sensor 192 capable of detecting the partial pressure of oxygen in the fluid within the body cavity C (bladder C1), and a temperature sensor 194 capable of detecting the temperature inside the body cavity (bladder temperature). The medical detection device 19 further includes a pressure-receiving section 281 that can be deformed when subjected to pressure, and a pressure transmission lumen 282 that receives the pressure inside the body cavity at the pressure-receiving section 281 and transmits it as atmospheric pressure.

[0098] This configuration allows for effective assessment of the state of living organism B by detecting the partial pressure of oxygen in the fluid (urine) within the body cavity (bladder), the intra-body cavity pressure (bladder pressure), and the intra-body cavity temperature (bladder temperature).

[0099] As shown in Figure 6, the system includes an oxygen partial pressure correction unit 346 that corrects the oxygen partial pressure based on at least one of the intra-body cavity pressure (intra-bladder pressure) and intra-body cavity temperature (intra-bladder temperature) in the living organism B and calculates a corrected oxygen partial pressure.

[0100] With this configuration, the partial pressure of oxygen can be corrected based on at least one of the intra-body cavity pressure and intra-body cavity temperature, allowing for more effective assessment of the state of the living body B based on the corrected partial pressure of oxygen. When the tip of the medical detection device 19 is placed in the body cavity C, the pressure receiving part 281 does not come into contact with the inner wall of the bladder C1, so the pressure detection part 30 can accurately detect the intra-bladder pressure.

[0101] As shown in Figure 4, the medical detection device 19 supports an oxygen partial pressure sensor 192 and a pressure transmission unit 193, and includes a shaft 191 that can be inserted into the lumen 121A of the catheter 12. With this configuration, the oxygen partial pressure sensor 192 and the pressure transmission unit 193 are integrated by the shaft 191, resulting in good insertability of the medical detection device 19 into the catheter 12.

[0102] The shaft 191 is equipped with a connector 222 that connects to the catheter hub 123 of the catheter 12 when the medical detection device 19 is inserted into the catheter 12. This configuration improves the ease of insertion into the living body B.

[0103] The pressure-receiving section 281 is a membrane 281A. With this configuration, the pressure-receiving section 281 can be realized with a simple structure.

[0104] As shown in Figure 2, the body cavity C is the bladder C1 of living organism B, the liquid is the urine L1 of living organism B, and the oxygen partial pressure sensor 192 can detect the oxygen partial pressure of the urine L1 in the bladder C1. The pressure transmission unit 193 can transmit the pressure inside the bladder C1, and the temperature sensor 194 can detect the temperature inside the bladder C1.

[0105] This configuration allows for effective assessment of the state of bladder C1 in living organism B by detecting the oxygen partial pressure of urine L1 within bladder C1, the intravesical pressure within bladder C1, and the intravesical temperature within bladder C1.

[0106] As shown in Figure 8A, the medical detection device 19A according to the first modified example includes a shaft 191A. The shaft 191A includes a sensor lumen 221A and a pressure transmission lumen 282A. When viewed from the axial direction of the shaft 191A, the sensor lumen 221A is eccentrically radially outward with respect to the axis of the shaft 191A. A temperature sensor 194 is housed and supported in the sensor lumen 221A. In the sensor lumen 221A, the temperature sensor body 194A is covered by a seal structure 24A. An oxygen partial pressure sensor 192 is housed in the pressure transmission lumen 282A. In the pressure transmission lumen 282A, the oxygen sensor body 192A is positioned towards the tip of the pressure receiving portion 401. The oxygen sensor body 192A is exposed towards the tip of the sensor lumen 221A.

[0107] As shown in Figure 8B, the medical detection device 19B according to the second modified example includes a shaft 191B. An oxygen partial pressure sensor 192 and a temperature sensor 194 are housed and supported inside the shaft 191B. A pressure transmission section 193B is also provided inside the shaft 191B. The pressure transmission section 193B, the oxygen partial pressure sensor 192, and the temperature sensor 194 are spaced apart from each other in the radial direction of the shaft 191B. The pressure transmission section 193B includes a pressure receiving section 421 and a pressure transmission tube 280B. The pressure receiving section 421 has a membrane 421A. The membrane 421A is a balloon that communicates with the pressure transmission lumen 282B of the pressure transmission tube 280B.

[0108] As shown in Figure 8C, the medical detection device 19C according to the third modified example comprises a shaft 191C and a pressure transmission section 193C. The shaft 191C comprises a first lumen 441C and a second lumen 442C. The first lumen 441C is a sensor lumen. An oxygen partial pressure sensor 192 is housed in the first lumen 441C.

[0109] The second lumen 442C is separated from the first lumen 441C and positioned along the first lumen 441C. The pressure transmission unit 193C is provided in the second lumen 442C. The pressure transmission unit 193C comprises a pressure receiving unit 461 and a pressure transmission tube 462 connected to the pressure receiving unit 461. The pressure receiving unit 461 is a balloon 461A. When urine L1 comes into contact with the tip of the expanded balloon 461A, the gas inside the balloon 461A is transmitted as atmospheric pressure to the pressure detection unit 30 via the pressure transmission tube 462 due to the liquid pressure of the urine L1. As a result, the pressure transmission unit 193C can detect the pressure of the urine L1 inside the bladder C1 (intravesical pressure) in the pressure detection unit 30.

[0110] As shown in Figure 9A, the medical detection device 19D according to the fourth modified example comprises a shaft 191D equipped with a sensor lumen 221D and a pressure transmission lumen 282D. The sensor lumen 221D is located approximately at the center of the shaft 191D (see Figure 9B). The shaft 191D is provided with a communication passage 50D. The communication passage 50D is part of the sensor lumen 221D. The communication passage 50D extends in the axial direction of the shaft 191D. The communication passage 50D communicates with a communication hole 52D that opens at the tip of the shaft 191D. Through the communication hole 52D, the communication passage 50D of the shaft 191D and the lumen (urinary tract) of the catheter 12 communicate with each other. A portion of the urine L1 flowing through the urinary tract 124 flows into the communication passage 50D of the shaft 191D and flows along the communication passage 50D. The base end of the communication passage 50D is connected to the tube 14. The pressure transmission lumen 282D is positioned radially outward from the sensor lumen 221D. The pressure transmission lumen 282D is formed inside the outer peripheral wall 44 of the shaft 191D, and the pressure receiving portion 481 is located therein.

[0111] As shown in Figure 10A, the fifth modified medical detection device 19E comprises a shaft 191E equipped with a sensor lumen 221E and a pressure transmission lumen 282E. The sensor lumen 221E is provided radially outward from the center of the shaft 191E. The sensor lumen 221E is formed inside the outer peripheral wall 44 of the shaft 191E. The pressure transmission lumen 282E, on which the pressure receiving portion 481 is located, is provided radially outward from the center of the shaft 191E. With respect to the center of the shaft 191E, the sensor lumen 221E and the pressure transmission lumen 282E are arranged in opposite directions to each other (see Figure 10B).

[0112] The shaft 191E is further provided with a communication passage 50E. When viewed from the axial direction of the shaft 191E, the communication passage 50E is located between the sensor lumen 221E and the pressure transmission lumen 282E. The communication passage 50E and the lumen (urinary tract) of the catheter 12 are in communication with each other through a communication hole 52E in the shaft 191E.

[0113] As shown in Figure 11, the medical fluid delivery system 101 according to the second embodiment includes an occlusion unit 102 (see Figure 12), a state monitoring unit 103, and a state detection unit 104 (see Figure 12).

[0114] As shown in Figure 12, the occlusion portion 102 is provided in the middle portion 143 of the tube 14. The occlusion portion 102 is provided so as to be able to block the flow of urine L1 through the tube 14 by blocking the tube 14. The occlusion portion 102 is provided in the pump device 20P. The occlusion portion 102 is the pump device 20P itself. Note that the occlusion portion 102 may be provided separately from the pump device 20P.

[0115] The state monitoring unit 103 is provided in the middle section 143 of the tube 14. However, the state monitoring unit 103 is not limited to being located in the middle section 143 of the tube 14. The state monitoring unit 103 monitors changes in the state of urine L1 inside the tube 14. The state monitoring unit 103 is provided in the middle section 143 of the tube 14 and housed in the console 18. The state monitoring unit 103 comprises a first state monitoring unit 1031 and a second state monitoring unit 1032.

[0116] The first state monitoring unit 1031 is positioned at a first position P1 in the middle section 143 of the tube 14, upstream of the occlusion section 102. The first state monitoring unit 1031 monitors the state of the urine L1 inside the tube 14 at the first position P1. The first state monitoring unit 1031 detects a first state parameter of the urine L1 at the first position P1.

[0117] The first state monitoring unit 1031 includes a first pressure detection unit 1051. The first pressure detection unit 1051 detects the pressure of the urine L1 in the tube 14 at a first position P1. The first state parameter is the first pressure of the urine L1 at the first position P1. The second state monitoring unit 1032 includes a second pressure detection unit 1052. The second pressure detection unit 1052 detects the pressure of the urine L1 in the tube 14 at a second position P2. The second state parameter is the second pressure of the urine L1 at the second position P2.

[0118] The state detection unit 104 is provided in the calculation unit 341 of the control device 34. The state detection unit 104 detects changes in the state of the urine L1 in the tube 14. The state detection unit 104 receives detection data from the first state monitoring unit 1031 and the second state monitoring unit 1032, respectively. The state detection unit 104 detects (calculates) the difference between the first state parameter (first pressure) detected by the first state monitoring unit 1031 and the second state parameter (second pressure) detected by the second state monitoring unit 1032. In this embodiment, the difference between the first state parameter and the second state parameter is the differential pressure.

[0119] The medical fluid delivery system 101 is used as follows:

[0120] With the catheter 12 inserted into the bladder C1 of the living organism B, the pressure inside the tube 14 is detected by the first state monitoring unit 1031 and the second state monitoring unit 1032, respectively. The state detection unit 104 calculates the difference data between the first state parameter detected by the first state monitoring unit 1031 and the second state parameter detected by the second state monitoring unit 1032. Based on the difference data calculated by the state detection unit 104, the control unit 345 determines whether or not to release the blockage state of the tube 14 by the blockage unit 102 of the pump device 20P. If the control unit 345 determines that the difference data is greater than or equal to a preset difference threshold, it determines that a predetermined amount or more of urine L1 has accumulated in the bladder C1 and drives the pump device 20P to open the blockage unit 102. On the other hand, if the control unit 345 determines that the difference data is less than the difference threshold, it does not drive the pump device 20P and continues to monitor the pressure of the urine L1 inside the tube 14 using the state monitoring unit 103.

[0121] The method for comparing the first state monitoring unit 1031 and the second state monitoring unit 1032 and calculating the threshold that becomes the driving condition for the pump device 20P is not limited to just the difference; for example, the threshold may be calculated using the following method.

[0122] The value of the second state monitoring unit 1032 is affected by the height of the atmospheric opening through the open section (not shown) and the operation of the pump device 20P, but is not affected by whether or not urine L1 is produced. The value of the second state monitoring unit 1032 may also fluctuate to a negative value. Therefore, if the driving conditions for the pump device 20P are set only by the difference between the value of the first state monitoring unit 1031 (first state parameter) and the value of the second state monitoring unit 1032 (second state parameter), depending on the state of the first state parameter of the first state monitoring unit 1031, it is conceivable that the pump device 20P may be operated even when no urine L1 has been produced in the bladder C1. For this reason, it is preferable to determine the driving conditions for the pump device 20P from two or more parameters.

[0123] Specifically, the first and second state parameters are required to conform to set thresholds. In addition, if the first state parameter is greater than the second state parameter, the absolute value of the second state parameter is used, and the difference between the values ​​of the first and second state parameters is calculated.

[0124] Alternatively, one could perform a correction to zero out the second state parameter, then apply the same correction to the first state parameter as the one used for zero-out correction, and use the corrected value of the first state parameter.

[0125] According to the second embodiment, the amount of urine L1 stored in the bladder C1 can be effectively determined based on the pressure data obtained by the state monitoring unit 103 and the state detection unit 104, and the timing of fluid delivery to the medical bag 16 can be determined.

[0126] 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 intent 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 inserted into the bladder of a living organism; a tube connected to the catheter; a medical bag connected to the tube; and a medical detection device insertable into the catheter for acquiring information about the living organism, wherein the medical detection device comprises: an oxygen partial pressure sensor capable of detecting the oxygen partial pressure of the fluid in the bladder; a pressure detection unit for detecting intravesical pressure, which is the pressure inside the bladder; a temperature sensor capable of detecting intravesical temperature, which is the temperature inside the bladder; and an oxygen partial pressure correction unit for correcting the oxygen partial pressure and calculating a corrected oxygen partial pressure based on at least one of the intravesical pressure and the intravesical temperature.

2. A medical fluid delivery system according to claim 1, comprising a pressure transmission unit which includes a pressure receiving unit disposed within the catheter and deformable upon receiving pressure, and a pressure transmission lumen which receives the intrabladder pressure at the pressure receiving unit and transmits it as a gauge pressure for detecting the intrabladder pressure, wherein the pressure detection unit detects the pressure transmitted by the pressure transmission unit.

3. A medical fluid delivery system according to claim 1, further comprising: a delivery unit connected to the tube and capable of delivering the liquid in the tube toward the medical bag; and a control unit that controls the delivery unit, wherein the control unit delivers the liquid in the tube by the delivery unit when the bladder pressure rises above a predetermined pressure.

4. A medical fluid delivery system according to claim 1 or 2, wherein the catheter has a urinary tract which is a passage for the liquid urine, and the medical fluid delivery system further comprises a flow rate measuring unit capable of detecting the flow rate of the urine in the urinary tract.

5. A medical fluid delivery system according to claim 4, comprising a prediction unit that predicts the risk of developing acute kidney injury based on the flow rate, the corrected oxygen partial pressure, the intravesical pressure, and the intravesical temperature.

6. A medical detection device for acquiring information about a living organism, the medical detection device comprising: an oxygen partial pressure sensor capable of detecting the partial pressure of oxygen in a liquid within the body cavity; a pressure transmission unit having a pressure receiving unit disposed within a catheter inserted into the body cavity and deformable upon receiving pressure; a pressure transmission lumen capable of receiving the intracavitary pressure, which is the pressure within the body cavity, at the pressure receiving unit and transmitting it as a gauge pressure; and a temperature sensor capable of detecting the intracavitary temperature, which is the temperature within the body cavity.

7. A medical detection device according to claim 6, comprising an oxygen partial pressure correction unit that corrects the oxygen partial pressure based on at least one of the intra-body cavity pressure and the intra-body cavity temperature to calculate a corrected oxygen partial pressure.

8. A medical detection device according to claim 7, comprising a shaft that supports at least the oxygen partial pressure sensor and the pressure transmission unit and is insertable into the catheter.

9. A medical detection device according to claim 8, wherein the shaft comprises a connector that connects to the catheter hub of the catheter when the medical detection device is inserted into the catheter.

10. A medical detection device according to claim 6, wherein the oxygen partial pressure sensor is a fluorescent sensor.

11. A medical detection device according to claim 6, wherein the pressure-receiving portion is a membrane.

12. A medical detection device according to any one of claims 6 to 11, wherein the body cavity is the bladder of the living organism, the liquid is the urine of the living organism, the oxygen partial pressure sensor is capable of detecting the oxygen partial pressure of the urine in the bladder, the pressure transmission unit is capable of transmitting the pressure in the bladder, and the temperature sensor is capable of detecting the temperature in the bladder.

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