Four-cavity urodynamics catheter
By designing a four-chamber urodynamic catheter and using a fixed flat balloon to fix the catheter within the urethra, the existing catheter slippage and displacement are solved, and the simultaneous pressure measurement of the bladder and urethra is achieved, improving the accuracy and efficiency of measurement.
Patent Information
- Application Number
- CN202422181143.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-09-05
AI Technical Summary
Existing urodynamic catheters are prone to slip and displace when measuring bladder and urethral pressure, resulting in inaccurate measurements and increased workload for healthcare workers.
A four-room urodynamic catheter is designed, including a four-room tube body, a urethral pressure measurement connection tube, a balloon connection tube, a perfusion connection tube and a bladder connection tube. A fixed flat balloon is used to fix the catheter after filling the urethra to prevent slipping and displacement, while achieving simultaneous pressure measurement between the bladder and urethra.
The stable fixation of the catheter in the urethra is achieved, the accuracy and efficiency of pressure measurement are improved, continuous urinary dynamics data is provided, and doctors provide accurate analysis basis.
Smart Images
Figure CN223248210U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a four-lumen urodynamic catheter. Background Art
[0002] A urodynamic catheter is a disposable medical manometric catheter used to measure and record bladder and urethral pressure and volume. It is used in conjunction with a urodynamic meter or urodynamic measurement device. A urodynamic catheter typically consists of a flexible catheter connected to a pressure sensor and can be inserted through the urethra into the bladder. Using a urodynamic meter or urodynamic measurement device, doctors can measure pressure changes within the bladder and urethra, urine flow rate, and bladder volume. Urodynamic catheters are widely used in the diagnosis and treatment of urination-related conditions such as urethral obstruction, prostatic hyperplasia, and bladder dysfunction. They help doctors understand bladder and urethral voiding function, assess bladder and urethral pressure, urine flow, and voiding function, and help formulate appropriate treatment plans. Using a urodynamic catheter is typically a simple and painless procedure. The doctor inserts the catheter through the urethra into the bladder and gradually instills fluid to increase bladder pressure. Simultaneously, the pressure sensor records pressure changes and urine flow. The entire procedure typically takes only a few minutes and is painless. The results of urodynamic tube measurements can be recorded and analyzed using a device connected to a computer or data recorder. Doctors can use this data to assess bladder function and develop personalized treatment plans. In general, urodynamic tubes are medical devices used to measure and record bladder and urethral pressure, urine flow rate, and volume. They play an important role in assessing urinary function and diagnosing urinary tract diseases.
[0003] The urodynamic catheters currently available on the market can be divided into the following categories:
[0004] Double-lumen urodynamic catheter: A double-lumen urodynamic catheter is usually made of soft elastic material, which is easy to insert into the urethra and bladder without causing damage to the urethra and bladder tissue. One lumen of the double-lumen urodynamic catheter is the irrigation lumen, whose function is to inject normal saline into the bladder to fill the bladder, and the other lumen is the pressure measuring lumen, whose function is to connect to the urodynamic meter to measure bladder pressure, but it can only measure one of the bladder or urethral pressures at a time. After measuring the bladder pressure, the pressure measuring port of the catheter is withdrawn into the urethra to measure the urethral pressure. This double-lumen urodynamic catheter requires two positioning of the pressure measuring port during measurement, which adds unnecessary workload to medical staff. At the same time, because the catheter is connected to an irrigation connecting tube and a pressure extension tube on the outside, both of which have a certain weight, it is easy for the catheter to be pulled out and displaced due to the action of gravity, making the channel of the measuring port easy to lose. In other words, the double-lumen urodynamic catheter has no fixing device and is prone to slipping or displacement.
[0005] Three-lumen urodynamic catheter: The three lumens of the three-lumen urodynamic catheter are: irrigation chamber, cystometry chamber, and urethral pressure chamber. The function of the irrigation chamber is to inject normal saline into the bladder to fill the bladder. The cystometry chamber measures bladder pressure, while the urethral pressure chamber measures urethral pressure. By simply placing the two pressure measuring ports in the bladder and urethra respectively, the pressure in the bladder bone and urethra can be measured at the same time, which provides convenience for medical staff, but still does not solve the problem of easy slippage and displacement of the catheter.
[0006] Three-lumen pigtail urodynamic catheter: Its structure is based on the three-lumen urodynamic catheter, with the pressure measuring tube head designed into a pigtail shape to prevent slipping and displacement. However, this structure has defects in fixation. Due to the limited strength of the pigtail fixation, it is also prone to slipping and displacement when subjected to external forces, and cannot truly solve the problem of slipping and displacement.
[0007] The double-balloon five-chamber urodynamic catheter has two balloons, one for fixing the urethra and the other for fixing the bladder. There is no point in fixing the bladder with the balloon because, firstly, the space volume of the bladder after filling reaches 500ml, and if the balloon is fixed, it must also be filled to this size. Secondly, if the balloon is fixed in the bladder near the urethral opening, the urethral opening will be blocked after the balloon is filled, and urine cannot enter the urethra, so the pressure in the urethra cannot be measured synchronously. Utility Model Content
[0008] In view of the deficiencies in the prior art, the utility model provides a four-lumen urodynamic catheter.
[0009] To achieve the above objectives, the present invention provides the following technical solutions:
[0010] A four-lumen urodynamic catheter comprises a four-lumen tube body, a urethral pressure measuring connecting tube, a balloon connecting tube, an irrigation connecting tube and a bladder connecting tube. The top of the four-lumen tube body is spherically closed, and four cavities of different sizes and not connected to each other are arranged inside. The other end of the four-lumen tube body is provided with a connector, and one end of the connector is provided with a urethral pressure measuring connecting tube, a balloon connecting tube, an irrigation connecting tube and a bladder connecting tube, which are respectively connected to the four cavities in the four-lumen tube body; an irrigation port is provided at the top of the four-lumen tube body, which is connected to the irrigation connecting tube; a bladder pressure measuring port is provided on the four-lumen tube body near the irrigation port, which is connected to the bladder connecting tube; a urethral pressure measuring port is provided on the four-lumen tube body, which is connected to the urethral pressure measuring connecting tube; a fixed flat balloon is provided on the four-lumen tube body near the urethral pressure measuring port, which is connected to the balloon connecting tube.
[0011] Preferably, the four-lumen tube body has a diameter of 3-5 mm, is extruded from polyurethane material, and has a circular outer surface.
[0012] Preferably, the urethral pressure measuring port is 60-70 mm away from the top end of the four-lumen tube body.
[0013] Preferably, the fixed flat balloon is a compliant balloon made of soft polyurethane material, and is 80-90 mm away from the top of the four-lumen tube.
[0014] Preferably, the balloon connecting tube and the perfusion connecting tube are both provided with a one-way valve, which is composed of a PC material shell, a 304 stainless steel spring, a silicone sealing ring, a plug and other accessories. The one-way valve can inject liquid or gas in the forward direction and automatically cut off the reverse direction after the syringe is pulled out, so as to prevent the liquid in the bladder and the balloon from leaking.
[0015] The beneficial effects of the present invention are as follows: the present invention can measure the pressure of the bladder and urethra simultaneously. A fixed flat balloon with a volume of 3-5 ml is designed on the tube body. The urodynamic catheter is inserted through the urethra. After confirming that the pressure measuring ports on the catheter enter the corresponding bladder and urethra pressure measuring positions, the fixed balloon is filled with normal saline so that the entire catheter tube body is fixed in the urethra through the balloon. Only when the catheter is fixed in the urethra can the catheter be effectively prevented from slipping or moving during the pressure measurement operation, causing the pressure measuring ports to be displaced. The catheter in the bladder will float freely in the bladder, so that the bladder pressure can be measured very conveniently, thereby improving the efficiency of the use of the urodynamic catheter and the accuracy of the pressure measurement, and providing accurate data for the doctor's subsequent analysis. The present invention is sophisticated in design and can accurately measure the flow rate, pressure and volume of urine to provide accurate urodynamic parameters. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural diagram of the present utility model.
[0017] In the figure: four-chamber tube body 1, irrigation port 2, bladder pressure measuring port 3, urethra pressure measuring port 4, fixed flat balloon 5, urethra pressure measuring connecting tube 6, balloon connecting tube 7, irrigation connecting tube 8, bladder connecting tube 9, connector 10, one-way valve 11. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0019] See also Figure 1A four-lumen urodynamic catheter comprises a four-lumen tube body 1, a urethral pressure measuring connecting tube 6, a balloon connecting tube 7, an irrigation connecting tube 8 and a bladder connecting tube 9. The top of the four-lumen tube body 1 is spherically closed, and four cavities of different sizes and not connected to each other are arranged inside. The other end of the four-lumen tube body 1 is provided with a connector 10, and one end of the connector 10 is provided with a urethral pressure measuring connecting tube 6, a balloon connecting tube 7, an irrigation connecting tube 8 and a bladder connecting tube 9, which are respectively connected to the four cavities in the four-lumen tube body 1; an irrigation port 2 is provided at the top of the four-lumen tube body 1, which is connected to the irrigation connecting tube 8; a bladder pressure measuring port 3 is provided on the four-lumen tube body 1 near the irrigation port 2, which is connected to the bladder connecting tube 9; a urethral pressure measuring port 4 is provided on the four-lumen tube body 1, which is connected to the urethral pressure measuring connecting tube 6; a fixed flat balloon 5 is provided on the four-lumen tube body 1 near the urethral pressure measuring port 4, which is connected to the balloon connecting tube 7.
[0020] The following is an explanation of the various components of the utility model:
[0021] Four-cavity tube body 1: The tube body has a diameter of 3-5mm (9-15F), a spherical closed top, and is equipped with four cavities of different sizes that are not connected to each other. It is extruded from polyurethane material, with a round outer surface and a smooth surface.
[0022] Irrigation port 2: It is located at the front end of the tube body, with the opening within 5-10 mm from the top, and is connected to the irrigation connection tube 7 through the inner cavity of the tube body, and has the function of injecting physiological saline from outside the body and filling the bladder.
[0023] The bladder pressure measuring port 3 is located on the side of the tube body, with the opening 20-25 mm from the top. It is connected to the bladder pressure measuring connecting tube 8 through the inner cavity of the tube body, and forms a closed passage to connect to the urodynamic measuring instrument to monitor the pressure in the bladder.
[0024] Urethral pressure measuring port 4: It is located on the side of the tube body, with the opening within 60-70mm from the top. It communicates with the urethral pressure measuring connecting tube 6 through the tube body cavity, and forms a closed passage to connect to the urodynamic measuring instrument to monitor the pressure in the bladder.
[0025] Urethral fixation balloon 5: Made of soft polyurethane, this compliant balloon has a volume of 3-5ml. When filled, it expands the urethra and secures the catheter within the urethra, preventing it from falling out or shifting. The opening is located 80-90mm from the tip and communicates with the balloon connection tube 7 through the inner lumen of the tube.
[0026] Urethral pressure measurement connecting tube 6: The connecting tube comes with a Luer female connector, which can be connected to the in vitro pressure measurement pipeline to the pressure measurement equipment. The tube body is transparent blue, made of polyurethane, and has a capital U printed on the tube body.
[0027] Balloon connecting tube 7: The balloon connecting tube is equipped with a one-way valve 11, which automatically closes after the balloon is inflated. The tube body is transparent green and made of polyurethane. The word "BALL" in capital letters is printed on the tube body.
[0028] Perfusion connecting tube 8: The connecting tube is equipped with a one-way valve 11, which can be connected to a syringe or a peristaltic pump perfusion line for continuous perfusion. It will automatically close after being fully filled. The tube body is transparent and made of polyurethane, with the word FILL printed in capital letters on it.
[0029] Bladder pressure measurement connecting tube 9: The connecting tube comes with a Luer female connector, which can be connected to the in vitro pressure measurement pipeline to the pressure measurement equipment. The tube body is transparent red, made of polyurethane, and has a capital B printed on the tube body.
[0030] Connector 10: The catheter body and the connecting pipes are connected by an embedded injection molding process using a vertical injection molding machine to form a one-to-one corresponding communication relationship, but they are not interconnected.
[0031] One-way valve 11: The one-way valve is composed of a PC material shell, a 304 stainless steel spring, a silicone sealing ring, a plug and other accessories. The one-way valve can inject liquid or gas in the forward direction and automatically cut off the reverse direction after the syringe is pulled out, so as to prevent the liquid in the bladder and balloon from leaking.
[0032] The features of the present utility model are as follows: it is made of soft elastic material (polyurethane), which is convenient for insertion into the urethra and bladder, and will not cause damage to the urethra and bladder tissues. The dual pressure measuring ports are precisely positioned in the bladder and urethra without displacement, and the measurement data is accurate. It can simultaneously measure relevant parameters of the bladder and urethra under different urine states, such as the pressure of static urine, the pressure during urination, the urine flow rate and intensity, etc., thereby providing a comprehensive analysis and evaluation. The catheter designed as a flat balloon is the same size as the outer diameter of the tube body, and the hemispherical and smooth closed treatment of the catheter head makes it easy to insert into the urethra and bladder without causing obvious pain or discomfort. The small-volume compliant flat balloon will not cause obvious pain or discomfort when filled. It is convenient and simple to operate, fully functional and low-risk. The catheter can be inserted once to continuously measure the bladder and urethral pressure without moving the catheter position, so as to continuously monitor pressure changes and provide continuous urine dynamics data.
[0033] The flat balloon design allows the urodynamic catheter to be placed into the bladder through the urethra smoothly and without resistance, reducing the patient's discomfort. After determining that each pressure measuring port has entered the pressure measuring position, the fixed balloon is filled with normal saline to fix the entire catheter in the urethra through the balloon, effectively preventing the catheter from slipping or the pressure measuring port from shifting, improving the problem of pressure measurement failure, and improving the efficiency of the use of the urodynamic catheter and the accuracy of pressure measurement, providing accurate data for the doctor's subsequent analysis.
[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.
Claims
1. A four-lumen urodynamic catheter, comprising a four-lumen tube body (1), a urethral pressure measurement connecting tube (6), a balloon connecting tube (7), an irrigation connecting tube (8) and a bladder connecting tube (9), characterized in that: The top of the four-cavity tube body (1) is spherically closed, and four cavities of different sizes and not communicating with each other are arranged inside. The other end of the four-cavity tube body (1) is provided with a connector (10), and one end of the connector (10) is provided with a urethra pressure measuring connecting tube (6), a balloon connecting tube (7), an irrigation connecting tube (8) and a bladder connecting tube (9), which are respectively connected to the four cavities in the four-cavity tube body (1); an irrigation port (2) is provided at the top of the four-cavity tube body (1), which is connected to the irrigation connecting tube (8); a bladder pressure measuring port (3) is provided on the four-cavity tube body (1) near the irrigation port (2), which is connected to the bladder connecting tube (9); a urethra pressure measuring port (4) is provided on the four-cavity tube body (1), which is connected to the urethra pressure measuring connecting tube (6); and a fixed flat balloon (5) is provided on the four-cavity tube body (1) near the urethra pressure measuring port (4), which is connected to the balloon connecting tube (7).
2. A four-lumen urodynamic catheter according to claim 1, characterized in that: The four-lumen tube (1) has a diameter of 3-5 mm, is extruded from polyurethane material, and has a circular outer surface.
3. A four-lumen urodynamic catheter according to claim 2, characterized in that: The urethra pressure measuring port (4) is 60-70 mm away from the top end of the four-lumen tube (1).
4. The four-lumen urodynamic catheter according to claim 1, characterized in that: The fixed flat balloon (5) is a compliant balloon made of soft polyurethane material and is 80-90 mm away from the top end of the four-lumen tube (1).
5. The four-lumen urodynamic catheter according to claim 1, characterized in that: The balloon connecting tube (7) and the perfusion connecting tube (8) are both provided with a one-way valve (11).