Anti-pulling catheter
By incorporating an interface structure within the catheter, the fluid inside the balloon can be rapidly drained in the event of accidental pulling, preventing the catheter from remaining in the bladder. This solves the problem of tearing injuries to the bladder and urethra caused by accidental catheter removal, thus protecting the patient's urethra.
Patent Information
- Application Number
- CN202423120473.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing urinary catheters can easily cause tearing injuries to the bladder and urethra when accidentally removed, especially in patients who are unconscious or have limited mobility.
A pull-resistant urinary catheter was designed. By setting an interface structure at the inner tube, when the urinary catheter is accidentally pulled, the pressure inside the balloon increases, the interface breaks, and the fluid inside the balloon enters the tail tube, which then quickly collapses, preventing the urinary catheter from remaining in the bladder and avoiding damage.
It effectively prevents damage to the bladder and urethra when the urinary catheter is accidentally removed, protecting the patient's urethral health.
Smart Images
Figure CN223831582U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical device technology, specifically to a urinary catheter that is resistant to pulling. Background Technology
[0002] A urinary catheter is a flexible tube inserted through the urethra into the bladder to drain urine. Urinary catheters are usually made of natural rubber, silicone rubber, or polyvinyl chloride. Each urinary catheter has a balloon at the front. After the urinary catheter is inserted into the bladder, the balloon at the front is inflated to make it expand, which can be used to fix the position of the urinary catheter in the bladder and prevent it from falling out.
[0003] However, some unconscious patients may attempt to pull out the catheter themselves after it has been inserted. Others may forget that the catheter is secured to the bed and get out of bed on their own, leading to accidental and forced removal of the catheter. During this accidental removal, the balloon can cause tearing injuries to the bladder and urethra, severely damaging the urethra. Utility Model Content
[0004] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a pull-resistant urinary catheter. This application provides the following technical solution:
[0005] The device includes an inner tube, an outer tube sleeved outside the inner tube, and an inserter fixed to the head end of the inner tube and communicating with the inner tube. The outer tube and the inner tube are sealed together to form a cavity. A balloon is disposed on the outer tube at the cavity. An injection tube is communicated inside the balloon and extends out of the cavity. The inner tube includes an end tube connected to the inserter and a tail tube in another direction. The end tube and the tail tube are sealed together by an interface structure located inside the balloon. The interface structure is used to disconnect the connection between the end tube and the tail tube when subjected to axial tensile force.
[0006] By designing an interface structure at the inner tube inside the balloon to connect the two parts of the inner tube, when the user accidentally pulls the catheter, the pressure inside the balloon increases and the inner tube is subjected to traction force. Since the interface is relatively weak, when pulled, the end tube and the tail tube are disconnected, and the fluid inside the balloon can enter the tail tube and be quickly discharged from the tail tube, causing the balloon to deflate. At this time, the catheter cannot be left in the bladder and is pulled out, preventing damage to the bladder and urethra.
[0007] The interface structure includes an outer cylinder fixed to the tail tube and an inner cylinder fixed to the end tube, with the inner cylinder sealed and fitted inside the outer cylinder.
[0008] The outer cylinder is made of an elastic material, and the outer side of the inner cylinder has a flange. When the outer cylinder and the inner cylinder are fitted together, the flange of the outer cylinder and the inner cylinder are deformed upon contact, thus clamping the inner cylinder.
[0009] The outer cylinder has a convex ring on its outer side, and the inner cylinder has an elastic sleeve on its outer side. The opening end of the elastic sleeve has a constriction. When the outer cylinder and the inner cylinder are fitted together, the convex ring on the outer cylinder is engaged with the elastic sleeve.
[0010] The outer cylinder and the inner cylinder are provided with a tongue and groove joint on their outer sides. When the outer cylinder and the inner cylinder are fitted together, the tongue and groove joint is interference fit.
[0011] The interface structure is a ring-shaped thin film, and the end tube and the tail tube are connected through the ring-shaped thin film.
[0012] The outer tube and the tail tube have a connection point, and the outer tube and the tail tube are fixedly connected through the connection point. The outer tube is also provided with a telescopic section, which is located between the connection point and the balloon.
[0013] The telescopic section is an extendable pleated or elastic tube.
[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:
[0015] By designing an interface structure at the inner tube inside the balloon to connect the two parts of the inner tube, when the user accidentally pulls the catheter, the pressure inside the balloon increases and the inner tube is subjected to traction force. Since the interface is relatively weak, when pulled, the end tube and the tail tube are disconnected, and the fluid inside the balloon can enter the tail tube and be quickly discharged from the tail tube, causing the balloon to deflate. At this time, the catheter cannot be left in the bladder and is pulled out, preventing damage to the bladder and urethra.
[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a cross-sectional view of the interface structure of an embodiment of a pull-resistant urinary catheter.
[0019] Figure 2 This is a cross-sectional view of the tail tube of an embodiment of a pull-resistant urinary catheter.
[0020] Figure 3This is a cross-sectional view of the interface structure of an embodiment of a pull-resistant urinary catheter.
[0021] Figure 4 This is a cross-sectional view of the interface structure of an embodiment three of an anti-pull catheter.
[0022] Figure 5 This is a cross-sectional view of the interface structure of an embodiment four of a pull-resistant urinary catheter.
[0023] Figure 6 This is a schematic diagram of the interface structure of an embodiment four of an anti-pull catheter.
[0024] Figure 7 This is an external diagram of a urinary catheter designed to prevent tearing.
[0025] Reference numerals: 1. Inner tube; 11. End tube; 12. Tail tube; 13. Interface structure; 131. Outer tube; 132. Inner tube; 133. Elastic sleeve; 134. Concave-convex joint; 135. Annular membrane; 2. Outer tube; 21. Connection point; 22. Telescopic section; 3. Insertion body; 4. Balloon; 5. Injection tube. Detailed Implementation
[0026] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0027] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0029] Example 1
[0030] Please refer to Figure 1 , 2 As shown in Figure 7, this embodiment provides a pull-resistant urinary catheter.
[0031] The device includes an inner tube 1, an outer tube 2 sleeved outside the inner tube 1, and an inserter 3 fixed to the head end of the inner tube 1 and communicating with the inner tube 1. The outer tube 2 and the inner tube 1 are sealed together to form a cavity. A balloon 4 is provided in the outer tube 2 at the cavity. An injection tube 5 is connected inside the balloon 4 and extends out of the cavity. The above structure is the conventional structure of the urinary catheter in the prior art to realize its function. The details can be referred to in the prior art. The usage of the urinary catheter in this application is no different from the prior art, so it will not be described in detail. The difference from the prior art is that the inner tube 1 includes an end tube 11 connected to the inserter 3 and a tail tube 12 in another direction. The end tube 11 and the tail tube 12 are sealed and connected through an interface structure 13. The interface structure 13 is located inside the balloon 4. The interface structure 13 is used to disconnect the connection between the end tube 11 and the tail tube 12 when subjected to axial tension.
[0032] To allow the end tube 11 and the tail tube 12 to disconnect when the catheter is stretched, the interface structure 13 is designed as the weakest part of the inner tube 1: the interface structure 13 is an annular membrane 135, and the end tube 11 and the tail tube 12 are connected through the annular membrane 135.
[0033] To prevent the pulling force from being excessively distributed by the outer tube 2 when the catheter is pulled, thus preventing the interface structure 13 from being able to disconnect under force, the following improvements are made: There is a connection point 21 between the outer tube 2 and the tail tube 12, and the outer tube 2 and the tail tube 12 are fixedly connected through the connection point 21. The outer tube 2 is also provided with a telescopic section 22, which is located between the connection point 21 and the balloon 4. The connection point 21 can be an adhesive joint between the outer tube 2 and the tail tube 12, or it can be a connecting post between the outer tube 2 and the tail tube 12.
[0034] The telescopic section 22 is an extendable pleated or elastic tube; in use, the telescopic section 22 is close to or located inside the patient's urethra.
[0035] At this time, when the catheter is pulled, the outer tube 2 has a telescopic section 22, which is stretched and elongated, while the inner tube 1 does not have telescopicity. The tension is transmitted to the interface structure 13, that is, the annular membrane 135 is broken by the tension. At this time, the tail tube 12 is disconnected from the end tube 11 and communicates with the inside of the balloon 4; the liquid in the balloon 4 flows out through the tail tube 12.
[0036] Please refer to the following: Figure 3 As shown, in Embodiment 2, which is an improvement on Embodiment 1...
[0037] Because the annular 135 membrane has too low rigidity, it increases the difficulty of inserting the catheter. Furthermore, the tensile force required to prevent breakage, as well as the location and extent of the breakage, are difficult to control. Therefore, the interface structure needs to be improved.
[0038] The interface structure 13 includes an outer cylinder 131 fixed to the tail tube 12 and an inner cylinder 132 fixed to the end tube 11, with the inner cylinder 132 sealed and fitted inside the outer cylinder 131.
[0039] The outer cylinder 131 is made of elastic material, and the inner cylinder 132 has a flange on the outside. When the outer cylinder 131 and the inner cylinder 132 are fitted together, the flanges of the outer cylinder 131 and the inner cylinder 132 deform upon contact, clamping the inner cylinder 132. By clamping the inner cylinder 132 with the elastic material of the outer cylinder 131, the force required for their separation is more controllable. It can be adjusted by changing the size of the inner diameter of the outer cylinder 131 and the outer diameter of the inner cylinder 132, as well as the elasticity of the outer cylinder 131 and the smoothness between them. This ensures that it will not break when liquid is injected into the balloon 4, but will break when subjected to a large pulling force, and the break is fixed.
[0040] When in use, the catheter is pulled by an external force, and the outer tube 131 and inner tube 132 that are interlocked are pulled apart, the tail tube 12 is disconnected from the end tube 11 and communicates with the inside of the balloon 4; the liquid inside the balloon 4 flows out through the tail tube 12.
[0041] Please refer to the following: Figure 4 As shown, in Example 3, which is an improvement on Example 2...
[0042] In Example 2, although the rigidity is increased compared to Example 1, there are still some shortcomings; further improvements are made based on this:
[0043] The interface structure 13 includes an outer cylinder 131 fixed to the tail tube 12 and an inner cylinder 132 fixed to the end tube 11, with the inner cylinder 132 sealed and fitted inside the outer cylinder 131.
[0044] The outer tube 131 has a convex ring on its outer side, and the inner tube 132 has an elastic sleeve 133 on its outer side. The open end of the elastic sleeve 133 has a constriction. When the outer tube 131 and the inner tube 132 are fitted together, the convex ring on the outer tube 131 is engaged in the elastic sleeve 133. Based on the fitting of the outer tube 131 and the inner tube 132, the elastic sleeve 133 is further fitted with the convex ring on the outer tube 131. The outer tube 131 and the inner tube 132 can be made of the same material as the inner tube 1, and their rigidity is no different from that of an ordinary urinary catheter. At the same time, the size and elasticity of the elastic sleeve 133 and the convex ring, as well as the smoothness between them, can also determine the axial tensile force required for disconnection.
[0045] When in use, the catheter is pulled by an external force, and the protruding ring that is locked in the elastic sleeve 133 is disengaged from the elastic sleeve 133. At the same time, the outer sleeve 131 and the inner sleeve 132 that are locked together are pulled apart, the tail tube 12 is disconnected from the end tube 11 and communicates with the inside of the balloon 4; the liquid in the balloon 4 flows out through the tail tube 12.
[0046] Please refer to the following: Figure 5 , 6 As shown, in Example 4, which is an improvement on Example 2...
[0047] In addition to Embodiment 3, the following improvements can be made based on Embodiment 2:
[0048] The interface structure 13 includes an outer cylinder 131 fixed to the tail tube 12 and an inner cylinder 132 fixed to the end tube 11, with the inner cylinder 132 sealed and fitted inside the outer cylinder 131.
[0049] The outer cylinder 131 and the inner cylinder 132 are provided with a male and female joint 134 on their outer sides. When the outer cylinder 131 and the inner cylinder 132 are fitted together, the male and female joint 134 are interference fit. By setting the male and female joints 134, the friction generated by the interference fit between the male and female joints 134 makes the outer cylinder 131 and the inner cylinder 132 fit together, and its rigidity is even greater than that of other parts of the inner tube 1.
[0050] When in use, the catheter is pulled by an external force, the interlocking concave-convex connector 134 breaks apart, and at the same time the interlocking outer tube 131 and inner tube 132 are pulled apart, the tail tube 12 is disconnected from the end tube 11 and communicates with the inside of the balloon 4; the liquid in the balloon 4 flows out through the tail tube 12.
[0051] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A pull-resistant urinary catheter, comprising an inner tube (1), an outer tube (2) sleeved outside the inner tube (1), and an inserter (3) fixed to the head end of the inner tube (1) and communicating with the inner tube (1), wherein the outer tube (2) and the inner tube (1) are sealed together to form a cavity, and a balloon (4) is disposed at the cavity of the outer tube (2), wherein an injection tube (5) is communicated inside the balloon (4), and the injection tube (5) extends out of the cavity; characterized in that: The inner tube (1) includes an end tube (11) connected to the insert (3) and a tail tube (12) in another direction. The end tube (11) and the tail tube (12) are sealed and connected by an interface structure (13). The interface structure (13) is located inside the balloon (4). The interface structure (13) is used to disconnect the connection between the end tube (11) and the tail tube (12) when subjected to axial tension.
2. The anti-pull catheter as described in claim 1, characterized in that: The interface structure (13) includes an outer cylinder (131) fixed to the tail tube (12) and an inner cylinder (132) fixed to the end tube (11), wherein the inner cylinder (132) is sealed and fitted inside the outer cylinder (131).
3. The anti-pull catheter as described in claim 2, characterized in that: The outer cylinder (131) is made of elastic material, and the inner cylinder (132) has a flange on the outside. When the outer cylinder (131) and the inner cylinder (132) are fitted together, the flange of the outer cylinder (131) and the inner cylinder (132) are deformed in contact, clamping the inner cylinder (132).
4. The anti-pull catheter as described in claim 2, characterized in that: The outer cylinder (131) has a convex ring on its outer side, and the inner cylinder (132) is provided with an elastic sleeve (133) on its outer side. The opening end of the elastic sleeve (133) has a constriction. When the outer cylinder (131) and the inner cylinder (132) are fitted together, the convex ring on the outer cylinder (131) is engaged in the elastic sleeve (133).
5. The anti-pull catheter as described in claim 2, characterized in that: The outer cylinder (131) and the inner cylinder (132) are provided with a convex-concave joint (134) on their outer sides. When the outer cylinder (131) and the inner cylinder (132) are fitted together, the convex-concave joint (134) is interference fit.
6. The anti-pull catheter as described in claim 1, characterized in that: The interface structure (13) is an annular film (135), and the end tube (11) and the tail tube (12) are connected through the annular film (135).
7. The anti-pull catheter as described in claim 1, characterized in that: The outer tube (2) and the tail tube (12) have a connection point (21), and the outer tube (2) and the tail tube (12) are fixedly connected through the connection point (21). The outer tube (2) is also provided with a telescopic section (22), which is located between the connection point (21) and the balloon (4).
8. The anti-pull catheter as described in claim 7, characterized in that: The telescopic section (22) is an extendable pleated or elastic tube.