A urinary catheter connector

Abstract

The utility model provides a catheter connector relates to the field of medical devices, include: catheter body and set up in its lateral wall's sampling interface, the inside integrated unidirectional valve subassembly of sampling interface, this unidirectional valve subassembly is by valve seat and elastic valve leaflet constitutes, the elastic valve leaflet is in the normal state under the pre -tightening force and is in the closed sealed state, to block the communication between sampling interface and catheter body cavity. The application is through the elastic valve leaflet normal closure in unidirectional valve subassembly, blocks the communication of sampling interface and cavity, and the flow guide inclined plane enhances its closed tightness. Each structure precision cooperation realizes automatic anti -reflux, need not manual operation, promotes the convenience, strengthens medical operation safety reliability, solves the traditional catheter reflux pollution problem.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a urinary catheter connector. Background Technology

[0002] Urinary catheters are commonly used medical devices for draining urine. In clinical practice, it is frequently necessary to collect urine samples from catheters for testing to aid in disease diagnosis and treatment. Currently, the common method is to directly connect a syringe to the sampling interface on the side wall of the catheter for urine aspiration. However, traditional catheter connectors have revealed many problems that urgently need to be addressed in practical applications.

[0003] First, there is a serious risk of reflux contamination. After urine aspiration is completed and the aspiration device is removed, residual urine in the bladder can easily reflux into the catheter lumen through the sampling port due to factors such as pressure differences. This reflux can directly cause the freshly collected urine sample to be contaminated by other impurities or bacteria in the bladder, leading to biased test results that fail to accurately reflect the patient's actual urine condition, thus affecting the accurate diagnosis of the disease.

[0004] Secondly, some improved versions of traditional urinary catheters use a physical diaphragm as an anti-backflow device. However, this type of physical diaphragm generally requires manual operation by medical staff to open and close, which undoubtedly increases the complexity of operation. In busy medical settings, the anti-backflow function is easily lost due to operational errors or forgetfulness. Therefore, a urinary catheter connector is proposed. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by using a normally closed elastic valve in a one-way valve assembly to block the connection between the sampling interface and the cavity, while a guide slope enhances its tightness. The precise coordination of all components achieves automatic backflow prevention, eliminating the need for manual operation, improving convenience, enhancing the safety and reliability of medical procedures, and solving the problem of backflow contamination associated with traditional urinary catheters.

[0006] To solve the above-mentioned technical problems, the present invention can effectively prevent urine from flowing back into the sampling channel from the bladder and avoid sample contamination through the following technical solution.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A urinary catheter connector includes: a urinary catheter body and a sampling interface disposed on its side wall;

[0009] The sampling interface integrates a one-way valve assembly, which consists of a valve seat and an elastic diaphragm.

[0010] The elastic valve is in a closed and sealed state under normal conditions due to pre-tightening force, thereby blocking the connection between the sampling interface and the catheter body cavity;

[0011] When a negative pressure is applied to the sampling interface, the elastic valve deforms outward under the pressure difference to form a sampling channel, and automatically resets to the closed state after the negative pressure is removed.

[0012] Preferably, the elastic valve is a duckbill valve structure made of medical silicone, and the inner surface of the valve at the closed end is provided with a continuous sealing line, which forms a line contact sealing surface in the closed state.

[0013] Preferably, the valve seat has a flow-guiding slope on the side near the catheter body cavity to guide fluid pressure and promote the closure of the elastic valve.

[0014] Preferably, the inner wall of the valve seat is provided with an annular inner groove, and the edge of the elastic valve is fixed in the annular inner groove by an interference fit.

[0015] Preferably, the valve seat has a flow-guiding slope on the side near the catheter body cavity to guide fluid pressure and promote valve closure.

[0016] Preferably, the one-way valve assembly is located in the middle section of the axial channel of the sampling interface.

[0017] Preferably, the sampling interface is provided with a Luer connector at its end, the valve seat is fixed to the inner wall of the Luer connector base, and a fluid-sealed connection is formed between the base of the Luer connector and the inner cavity of the sampling interface.

[0018] Preferably, the Luer connector base and the sampling interface are connected by a thread, and the thread profile is arc-shaped.

[0019] Preferably, the elastic valve is integrally molded from medical-grade silicone or rubber material.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The urinary catheter connector provided in this application uses a normally closed elastic valve in the one-way valve assembly to block the connection between the sampling interface and the cavity, while the guide slope enhances its tightness. The precise fit of all components achieves automatic backflow prevention, eliminating the need for manual operation, improving convenience, enhancing the safety and reliability of medical procedures, and solving the problem of backflow contamination associated with traditional urinary catheters.

[0022] The elastic valve in this application adopts a duckbill valve structure. The sealing line on the inner surface of the closed end valve forms a line contact sealing surface, which has greater pressure and better sealing performance compared to surface contact sealing. The Luer connector and the sampling interface are threaded to form a fluid seal, which reduces the risk of leakage as a whole.

[0023] The elastic valve of this application is integrally molded from medical-grade silicone or rubber materials. These materials have good biocompatibility, are safe to use in medical environments, and will not have adverse effects on the patient's body. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the one-way valve assembly and Luer connector of this utility model;

[0028] Figure 4 This is a top view cross-sectional structural diagram of the present invention;

[0029] Figure 5 This is a partial structural view of the right side of the one-way valve assembly and Luer connector of this utility model;

[0030] Figure 6 This is a schematic diagram of the valve seat and elastic valve in the one-way valve assembly of this utility model in a disassembled state.

[0031] Figure number explanation: 1. Catheter body; 2. Sampling interface; 21. Luer connector; 3. One-way valve assembly; 31. Valve seat; 311. Annular inner groove; 312. Flow guide slope; 32. Elastic valve; 321. Sealing line. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0034] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0035] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number. Example

[0036] Please see Figure 1-6 A urinary catheter connector includes: a urinary catheter body 1 and a sampling interface 2 disposed on its side wall;

[0037] The sampling port 2 integrates a one-way valve assembly 3, which consists of a valve seat 31 and an elastic valve 32. Under normal conditions, the elastic valve 32 is in a closed and sealed state due to the pre-tightening force, so as to block the communication between the sampling port 2 and the cavity of the catheter body 1. When negative pressure is applied to the sampling port 2, the elastic valve 32 elastically deforms outward under the action of pressure difference to form a sampling channel, and automatically resets to the closed state after the negative pressure is removed.

[0038] The catheter connector of this application is mainly composed of a catheter body 1, a sampling interface 2, a one-way valve assembly 3, a valve seat 31, and an elastic valve 32. The following is a detailed description of its structure and working principle.

[0039] I. Detailed Structure and Connection Methods of Each Component

[0040] The catheter body 1 and sampling interface 2: The catheter body 1 serves as the basic channel for urine drainage, while the sampling interface 2 on its side wall provides a dedicated channel for urine sample collection. The Luer connector 21 at the end of the sampling interface 2 uses an arc-shaped thread profile to connect with the inner cavity of the sampling interface 2, conforming to the ISO80369-7 standard. This design not only ensures convenient connection with medical devices such as syringes, but also forms an efficient fluid seal through the tight fit between the threads, preventing air from entering or urine from leaking out during aspiration.

[0041] One-way valve assembly 3

[0042] Valve seat 31: Located in the middle of the axial channel of sampling interface 2, its inner wall has an annular groove 311 that firmly fixes the elastic valve 32 through an interference fit, ensuring that the elastic valve 32 will not loosen or shift in use scenarios with frequent pressure changes. The guide slope 312 on the side of valve seat 31 near the lumen of catheter body 1 is a key structural design to prevent urine backflow. It can mechanically decompose the fluid pressure transmitted from the bladder side, converting the pressure into a radial component force toward the elastic valve 32, thereby enhancing the tightness of valve closure.

[0043] Elastic valve 32: Made of medical-grade silicone or rubber in one piece to form a duckbill valve structure. This structure has good elastic deformation characteristics and maintains a closed state under normal conditions by means of the material's own pre-tightening force. The continuous sealing line 321 on the inner surface of the closed valve forms a line contact sealing surface when closed. Compared with traditional surface contact seals, line contact seals have greater pressure and a better sealing effect, and can more effectively block the communication between the sampling port 2 and the cavity of the catheter body 1.

[0044] II. Working Principle

[0045] The elastic valve 32 remains closed under its own pre-tightening force, and the sealing line 321 forms a tight physical barrier to prevent urine from the bladder from entering the sampling port 2. At this time, if there is fluid pressure in the bladder, the pressure is transmitted to the flow guiding slope 312 of the valve seat 31. The flow guiding slope 312 decomposes the pressure into a radial component, further squeezing the elastic valve 32, making it close more tightly, thus enhancing the anti-backflow effect from a mechanical perspective.

[0046] When the syringe is connected to the Luer connector 21 and negative pressure is applied, the external negative pressure acts on the opening end of the elastic valve 32. This negative pressure must overcome two resistances: the elastic restoring force of the elastic valve 32 itself and the hydrostatic pressure on the bladder side. When the negative pressure is large enough, the two elastic valves 32 open outwards towards the sampling interface 2, forming a smooth sampling channel. Urine flows smoothly into the sampling device under the action of the pressure difference, completing the collection of urine samples.

[0047] Once the suction force is removed, the elastic valve 32 quickly returns to its closed state under the rebound force of its own material, and the sealing line 321 forms a line contact seal again. At the same time, the urine pressure on the bladder side generates an additional sealing force through the guide slope 312. Even if there is a trace of residual pressure, it can ensure that the elastic valve 32 is tightly closed, preventing urine leakage. This effectively avoids the collected urine sample being contaminated by impurities or bacteria in the bladder, ensuring the accuracy of the test results.

[0048] This urinary catheter connector achieves automatic anti-backflow function through the precise fit between its various components, eliminating the need for manual operation by medical staff. This not only improves the ease of use but also enhances the safety and reliability of medical procedures, effectively solving the backflow and contamination problem of traditional urinary catheter connectors.

[0049] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A urinary catheter connector, characterized in that, include: The catheter body (1) and the sampling port (2) located on its side wall; The sampling interface (2) is internally integrated with a one-way valve assembly (3), which is composed of a valve seat (31) and an elastic valve (32); The elastic valve (32) is in a closed and sealed state under normal conditions by means of pre-tightening force, so as to block the communication between the sampling interface (2) and the cavity of the catheter body (1); When a negative pressure is applied to the sampling interface (2), the elastic valve (32) deforms outward under the action of the pressure difference to form a sampling channel, and automatically resets to the closed state after the negative pressure is removed.

2. The catheter connector according to claim 1, characterized in that: The elastic valve (32) is a duckbill valve structure made of medical silicone. The inner surface of the valve at the closed end is provided with a continuous sealing line (321), which forms a line contact sealing surface when closed.

3. A urinary catheter connector according to claim 2, characterized in that: The valve seat (31) is provided with a flow guide slope (312) on the side near the lumen of the catheter body (1) to guide fluid pressure to promote the closure of the elastic valve (32).

4. A urinary catheter connector according to claim 3, characterized in that: The valve seat (31) has an annular inner groove (311) on its inner wall, and the edge of the elastic valve (32) is fixed in the annular inner groove (311) by interference fit.

5. A urinary catheter connector according to claim 4, characterized in that: The valve seat (31) is provided with a flow guide slope (312) on the side near the lumen of the catheter body (1) to guide fluid pressure to promote valve closure.

6. A urinary catheter connector according to claim 1, characterized in that: The one-way valve assembly (3) is located in the middle section of the axial channel of the sampling interface (2).

7. A urinary catheter connector according to claim 6, characterized in that: The sampling interface (2) is provided with a Luer connector (21) at its end. The valve seat (31) is fixed to the inner wall of the base of the Luer connector (21), and a fluid-sealed connection is formed between the base of the Luer connector (21) and the inner cavity of the sampling interface (2).

8. A urinary catheter connector according to claim 7, characterized in that: The base of the Luer connector (21) and the sampling interface (2) are connected by a thread, and the thread profile is arc-shaped.

9. A urinary catheter connector according to claim 1, characterized in that: The elastic valve (32) is integrally molded from medical silicone or rubber material.

Images