Urethral catheter system

Abstract

To provide a technology for sampling urine from within the bladder easily.SOLUTION: A urinary tract catheter system includes: a catheter part which has a tube one end of which is disposed in the bladder and passes the urinary tract continuing to the bladder and the other end of which is disposed outside the body, a connector connecting the tube and an external tube, and a first connection part included in the connector; a tube one end of which is disposed inside the tube of the catheter part and passes the first connection part and the other end of which is disposed outside the connector; a second connection part connected to the other end of the tube; and a sucker connected to the second connection part which applies negative pressure to suck urine inside the bladder via the catheter part and the tube. The tube has a first opening in a part disposed in the bladder. The tube has a second opening in a part disposed inside the tube.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a urinary catheter system. Background Art

[0002] Acute kidney injury (AKI) during the perioperative period (particularly in cardiac surgery) adversely affects patient prognosis and significantly worsens patient outcomes. Therefore, early diagnosis of AKI is required. However, the diagnostic criteria for AKI still use serum creatinine level, which reaches its maximum value approximately 72 hours after surgery, leading to delays in treatment. Renal medullary tissue oxygen partial pressure and urinary oxygen partial pressure in the bladder (PuO₂) correlate in real time and may be useful for early diagnosis of acute kidney injury. Many researchers have advanced research on a method of continuously monitoring PuO₂ by inserting a special optical fiber probe (hereinafter referred to as "special probe") into the distal end of a urethral catheter, and the effectiveness of this method for predicting AKI is increasingly being demonstrated. Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese Unexamined Patent Publication No. 2021-62073 Patent Document 2 Japanese Unexamined Patent Publication No. 2022-23991 Summary of the Invention Problem to be Solved by the Invention

[0004] However, the special probe is expensive, time-consuming to fabricate, and there are cases where measurement cannot be performed due to device failure, which are problems. There is a need for a simpler method of collecting urine from the bladder to measure PuO₂ without using a special probe.

[0005] An object of the technology disclosed in the present disclosure is to provide a technique for collecting urine from the bladder more easily. Means for Solving the Problem

[0006] To address the above issues, the following measures will be taken.

[0007] That is, the first aspect is, A catheter having a tube with one end positioned in the bladder and passed through the urethra continuous with the bladder, and the other end positioned outside the body, a connector connecting the tube to an external tube, and a first connecting portion included in the connector, A tube having one end positioned inside the tube of the catheter portion and passing through the first connecting portion, with the other end positioned outside the connector, A second connecting portion connected to the other end of the tube, The device comprises a suction device connected to the second connection portion, which applies negative pressure to draw out urine from inside the bladder via the catheter portion and the tube, The tube has a first opening in the portion that is placed in the bladder, The tube has a second opening in the portion that is located inside the tube. This will be a urethral catheter system. [Effects of the Invention]

[0008] The disclosed technology can provide a simpler method for collecting urine from the bladder. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 shows an example of the configuration of the urethral catheter system 10 according to the embodiment. [Modes for carrying out the invention]

[0010] Embodiments will be described below with reference to the drawings. The configurations of the embodiments are illustrative, and the configuration of the invention is not limited to the specific configurations of the disclosed embodiments. In carrying out the invention, specific configurations may be adopted as appropriate depending on the embodiment.

[0011] [Embodiment] This section describes a bladder catheter that allows for reliable urine collection from within the bladder. The partial pressure of oxygen (PuO2) in the urine is measured from the collected urine. When measuring urinary oxygen pressure (PuO2), it is desirable that the urine be collected anaerobically from within the bladder. This is because exposure of the urine to air can affect the measurement results.

[0012] (Example configuration) Figure 1 shows an example of the configuration of the urethral catheter system 10 of this embodiment. The urethral catheter system 10 in Figure 1 includes a catheter section 100, a suction system 200, a syringe 300, and a urine collection bag system 400. A portion of the urethral catheter system 10 in Figure 1 is inserted into the bladder via the urethra.

[0013] The catheter portion 100 comprises a main body portion 110, a tip portion 120, a side hole 130, a balloon 140, a connector 150, and a connecting portion 160. The catheter portion 100 is inserted into the urethra from the tip portion 120. The main body portion 110 is designed to allow fluids such as urine and the tube of the suction system 200 to pass through it. The tip portion 120 is continuous with one end of the main body portion 110 and does not have an opening. If the tip portion 120 had an opening, the suction system 200 would come into direct contact with the bladder wall and could directly aspirate bladder wall tissue. By having no opening in the tip portion 120, the suction system 200 remains inside the catheter portion 100, reducing the risk of damage to the bladder wall. The main body portion 110 and the tip portion 120 are made of silicone resin, latex, natural rubber, etc. The main body portion 110 and the tip portion 120 are tubular, elastic tubes. The side holes 130 are openings provided near the tip portion 120 of the main body portion 110. For example, the side holes 130 are provided at a position of 1 mm to 5 mm from the tip of the tip portion 120. The side holes 130 are openings provided in the portion of the main body portion 110 that is placed in the bladder. The main body portion 110 is provided with one or more side holes 130. Fluid in the bladder can enter the interior of the main body portion 110 through the side holes 130. The balloon 140 is a member that fixes the main body portion 110 inside the bladder. The balloon 140 is provided on the outside of the main body portion 110, on the connector 150 side of the side holes 130 of the main body portion 110. The balloon 140 is inflated inside the bladder by introducing gas or liquid through a delivery pipeline (not shown), thereby fixing the main body portion 110 inside the bladder. The connector 150 connects the other end of the main body 110 to the urine collection bag system 400. Urine flowing from the bladder through the side hole 130 and the main body 110 flows through the inside of the connector 150 to the urine collection bag system 400. The connection between the main body 110 and the connector 150 is tightly sealed to prevent urine flowing inside the main body 110 and the connector 150 from leaking out of the connection. Similarly, the connection between the connector 150 and the urine collection bag system 400 is tightly sealed to prevent urine flowing inside the connector 150 and the urine collection bag system 400 from leaking out of the connection. The main body 110 and the connector 150 may be integrated. The connector 150 and the urine collection bag system 400 may also be integrated.

[0014] The connecting part 160 is a component that guides the tube of the suction system 200 inside the main body 110 from the inside to the outside of the connector 150. The connecting part 160 is provided on the connector 150 and guides the tube of the suction system 200 from the inside to the outside of the connector 150 so that the fluid inside the main body 110 does not leak out. The connecting part 160 is, for example, a plug made of an elastic resin (such as natural rubber) at the opening that connects the inside and outside of the connector 150. In addition, the plug has holes or slits through which the tube of the suction system 200 passes. For example At the connection part 160, the tube of the suction system 200 is covered with an elastic resin to prevent fluid from inside the main body 110 from leaking out. That is, the connection part 160 is in close contact with the outside of the tube of the suction system 200. Because the connection part 160 is in close contact with the outside of the tube of the suction system 200, the fluid (urine) inside the connector 150 does not leak out through the connection part 160. The configuration of the connection part 160 may be other. Also, the tube of the suction system 200 is not fixed to the connection part 160 so that the length of the tube of the suction system 200 inserted into the main body 110 can be changed and the tip 220 of the suction system 200 can be placed closer to the tip 120. The connector 150 and the connection part 160 are located outside the body. Also, an elastic resin may be placed between the connection part 160 and the tube of the suction system 200. Furthermore, the elastic resin may be compressed with a screw-type component or the like. The elastic resin is compressed by a screw-type component or the like, which fixes the connection part 160 and the tube of the suction system 200, while creating a structure that makes it difficult for external air or urine to pass between the inside and outside of the connector 150. The connector 150 and the connection part 160 may be integrated into one unit.

[0015] The suction system 200 comprises a main body 210, a tip 220, and a connecting part 230. The main body 210 is a cylindrical, elastic tube. The main body 210 passes inside the main body 110 of the catheter 100, allowing fluids such as urine to pass through it. The inner diameter of the main body 210 is, for example, 0.5 mm to 2 mm. The outer diameter of the tube of the suction system 200 is smaller than the inner diameter of the main body 110 of the catheter 100. The tip 220 is continuous with one end of the main body 210 and has multiple openings. That is, the tube of the suction system 200 (main body 210, tip 220) has multiple openings in the portion that is located inside the tube of the catheter 100 (main body 110, tip 120). Fluid outside the tube of the suction system 200 can enter the inside of the tube through these openings. For example, a tube for an epidural catheter used in clinical practice may be used as the tubing for the suction system 200. The main body 210 and the tip 220 are made of silicone resin, latex, natural rubber, or the like.

[0016] The main body 210 is led to the outside of the main body 110 via the connection part 160 of the catheter part 100. The connection part 230 connects the other end of the main body 210 to the syringe 300 so that fluid can pass through. The connection part 230 includes a one-way valve that allows fluid to flow only from the bladder side to the syringe 300 side. A well-known component for connecting the tube and the syringe 300 may be used in the connection part 230. The syringe 300 is detachable from the connection part 230. The tip 220 of the suction system 200 reaches near the tip 120 of the catheter part 100. The connector 150 is connected to the tube of the catheter part 100 and the tube of the urine collection bag system 400, making it easy for gas to enter the interior from the connector 150. By positioning the tip 220 of the suction system 200 near the tip 120 of the catheter portion 100, the opening of the tip 220 of the suction system 200 is moved further away from the connector 150, etc. This reduces the amount of gas that comes into contact with the urine aspirated through the suction system 200.

[0017] The syringe 300 is an aspirator that applies negative pressure to the inside by moving a piston to aspirate fluid inside the main body 210. The syringe 300 is an example of an aspirator. Another aspirator may be used instead of the syringe 300. Urine aspirated by the syringe 300 is used for measurement of urinary partial pressure of oxygen. Since the connecting portion 230 includes a one-way valve, the syringe 300 can anaerobically collect urine, and can prevent erroneous injection of harmful substances such as bacteria into the bladder. Furthermore, use of the syringe 300 enables urine collection in a short time.

[0018] The urine collection bag system 400 is a member that collects urine discharged from the bladder via the main body 110 of the catheter unit 100. The urine collection bag system 400 includes a cylindrical tube and an unillustrated urine bag. One end of a tube of the urine collection bag system 400 is connected to the connecting portion 160, and urine from the main body 110 passes through the tube. The other end of the tube of the urine collection bag system 400 is connected to the urine bag. The urine collection bag system 400 guides urine discharged from the bladder from the connecting portion 160 to the urine bag. The urine bag of the urine collection bag system 400 stores the urine. The tube of the urine collection bag system is an example of an external tube connected to the connector 150.

[0019] (Urine Aspiration) Herein, aspiration of urine from the bladder by the urethral catheter system 10 will be described. The aspirated urine is used, for example, for measurement of urinary partial pressure of oxygen.

[0020] The distal end portion 120 of the catheter unit 100 of the urethral catheter system 10 is inserted into the bladder via the urethra. A tube (main body 210, distal end 220) of the suction system 200 is inserted in advance into the interior of the main body 110 of the catheter unit 100. The tube (main body 210, distal end 220) of the suction system 200 may be inserted after the catheter unit 100 is inserted into the bladder. When the catheter unit is inserted into the bladder up to the balloon 140, a gas or liquid is injected into the balloon 140 to inflate the balloon 140, and the catheter unit 100 is fixed to the bladder.

[0021] Once the catheter section 100 is fixed to the bladder, the syringe 300 is connected to the connection section 230 of the suction system 200. By moving the piston of the syringe 300, negative pressure is applied inside the tube of the suction system 200 to aspirate urine. The first aspirated urine may be discarded after removing the syringe 300, as it may contain residual urine and impurities in the main body section 210. After discarding the first aspirated urine, the measuring syringe is connected to the connection section 230. By moving the piston of the measuring syringe, negative pressure is applied inside the tube of the suction system 200 to aspirate urine. The aspirated urine is collected in the measuring syringe. The urine collected in the measuring syringe is used to measure the partial pressure of oxygen in the urine. This allows urine from the bladder to be collected without exposure to air.

[0022] (others) The injection lumen of a well-known 3-way catheter, which has an injection lumen, a drainage lumen, and a balloon lumen with openings at the outer lumen tip, may be modified for the above-described suction system 200. That is, by providing the opening at the outer lumen tip of the injection lumen of the 3-way catheter into the lumen, the injection lumen can be used as a tube for the suction system 200. A syringe 300 or a measuring syringe can be connected to the injection lumen via the connection part 230 of the suction system 200 to aspirate urine from the bladder.

[0023] (Effects and mechanisms of the embodiment) The urethral catheter system 10 of this embodiment anaerobically aspirates urine from a person's bladder. The aspirated urine is used to measure the partial pressure of oxygen in the urine. By collecting urine anaerobically, the partial pressure of oxygen in the urine can be measured more accurately. With the urethral catheter system 10, urine can be easily collected anaerobically without waiting for urination by aspirating urine from the bladder. Furthermore, with the urethral catheter system 10, the partial pressure of oxygen in the urine can be measured without inserting a special probe used for measuring the partial pressure of oxygen in the urine into the bladder. With the urethral catheter system 10, urine can be collected more reliably and anaerobically by passing the tube of the suction system 200 for aspiration inside the tube of the catheter part 100.

[0024] Each of the above embodiments can be implemented in combination whenever possible. [Explanation of symbols]

[0025] 10: Urethral catheter system 100: Catheter section 110: Main body 120:Tip 130: Side hole 140: Balloon 150: Connector 160: Connection part 200: Suction System 210: Main body 220:Tip 230: Connection part 300: Syringe 400: Urine collection bag system

Claims

1. A catheter having a tube with one end positioned in the bladder and passed through the urethra continuous with the bladder, and the other end positioned outside the body, a connector connecting the tube to an external tube, and a first connecting portion included in the connector, A tube, one end of which is positioned inside the tube of the catheter portion and passes through the connector and the first connecting portion, and the other end of which is positioned outside the connector, A second connecting portion connected to the other end of the tube, The device comprises a suction device connected to the second connection portion, which applies negative pressure to draw out urine from inside the bladder via the catheter portion and the tube, The first connection portion is in close contact with the outside of the tube. The tube has a first opening in the portion that is placed in the bladder, The tube has a second opening in the portion that is located inside the tube. Urethral catheter system.

2. The second connection includes a one-way valve that allows fluid to flow only from the tube side to the suction device side. The urethral catheter system according to claim 1.

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