Urethral stent
By designing a metal wire braided structure and hydrophobic coating for the urethral stent, the problem of insufficient fit of existing stents is solved, achieving stable support and simplified installation, while reducing the difficulty of removal and tissue damage.
Patent Information
- Application Number
- CN202422960751.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-02
Smart Images
Figure CN223787748U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model discloses a urethral stent belongs to medical instrument technical field. BACKGROUND
[0002] The urethral system is narrow or blocked due to diseases, trauma or other reasons, including ureteral urethra, prostatic urethra, bladder neck, penile urethra and urethral bulb parts, causing urine retention, hematuria, dysuria and other symptoms, which seriously affect the quality of life. At present, the advanced method for treating urethral stricture or blockage is to implant a urethral stent, and there are different product models according to the different blockage positions; the stent types include metal stents, polymer stents, covered stents, bare stents and biodegradable stents.
[0003] The existing stents have the following disadvantages: first, the existing stents need to be flushed with hot water above 55 DEG C to open the trumpet mouth of the stent, which can easily cause burns to human tissues during the process; second, the existing stents have no film on the surface, which can easily cause tissue embedding and wrapping of the stent after long-term implantation, which can affect the removal of the stent; in addition, the existing stents have poor adhesion to the inner wall of the human tissue cavity after implantation, which can easily cause displacement of the stent, affect the effect of the stent, and make the removal process of the stent more difficult. UTILITY MODEL CONTENTS
[0004] The utility model discloses a urethral stent which can better adhere the trumpet mouth to the inner wall of the urethral tissue.
[0005] To solve the above technical problems, the utility model adopts the following technical scheme:
[0006] A urethral stent comprises a stent body in a cylindrical structure, the stent body comprises a straight body section and a trumpet mouth at the end of the straight body section, the straight body section is spirally woven by metal wires, and the trumpet mouth has elasticity and is spirally woven by metal wires; or the metal wires at the trumpet mouth are woven and arranged in a W shape.
[0007] The utility model has the beneficial effects that:
[0008] The metal wire is woven into a spiral or W-shaped form at the trumpet mouth, so that the trumpet mouth can better adhere to the inner wall of the urethra, and the trumpet mouth can provide more stable and reliable support for the urethra, and the positioning of the trumpet mouth in the urethra is more stable, the possibility of position deviation of the support body is reduced, and the support can play a better supporting role; in addition, the trumpet mouth has elasticity, so that the trumpet mouth can be better compressed, thereby reducing the maximum diameter of the trumpet mouth, and the support body can be installed into the catheter, so that the catheter can deliver the support body to the lesion position, and the installation of the support body is more simple and convenient.
[0009] Preferably, the straight section and / or the trumpet mouth surface is coated with a hydrophobic coating. With the foregoing technical solution, the hydrophobic coating can make the surface of the support hydrophobic, thereby not easily allowing bacteria to colonize, and can effectively reduce the phenomenon of urine scale formation on the surface of the support.
[0010] Preferably, the hydrophobic coating is coated on the outer surface of the straight section and / or the trumpet mouth; and / or, the hydrophobic coating is coated on the inner surface of the straight section and / or the trumpet mouth.
[0011] Preferably, the metal wire has a phase change characteristic, and the phase change temperature range is 5-20 DEG C; when the temperature of the metal wire is not more than 5 DEG C, the metal wire is in a martensite soft state; and when the temperature of the metal wire is not less than 20 DEG C, the metal wire is in an austenite rigid state. With the foregoing technical solution, when the support body is below 5 DEG C, the support body as a whole becomes soft, so that the support body is more easily taken out of the body, which helps to reduce the difficulty of taking out the support body; in addition, when the support body is above 20 DEG C, the support body as a whole becomes hard, so that the trumpet mouth can provide more stable and reliable support for the urethra, and the support body has a better supporting effect; at the same time, when the support body is in the urethra, the temperature is always above 20 DEG C, so the support body is not easily soft, and the possibility of position deviation of the support is reduced; in addition, the support body does not need to be heated by hot water to open the trumpet mouth, and the harm to the human body can be reduced.
[0012] Preferably, the metal wire is made of nickel-titanium alloy.
[0013] Preferably, the metal wires of the straight section are arranged closely.
[0014] Other features and advantages of the present application will be described in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF DRAWINGS
[0015] The present application will be further described below with reference to the drawings:
[0016] Figure 1 It is a front view of the urethral support of the present application;
[0017] Figure 2 It is a front view of the hydrophobic coating coated on the trumpet mouth of the urethral support in the utility model;
[0018] Figure 3 It is a front view of the hydrophobic coating coated on the support main body of the urethral support in the utility model;
[0019] Figure 4 It is a partial sectional view of the hydrophobic coating coated on the outer surface of the support main body in the urethral support in the utility model;
[0020] Figure 5 It is a partial sectional view of the hydrophobic coating coated on the inner surface of the support main body in the urethral support in the utility model;
[0021] Figure 6 It is a partial sectional view of the hydrophobic coating coated on the inner and outer surfaces of the support main body in the urethral support in the utility model;
[0022] Figure 7 It is a sectional view of the trumpet mouth compressed in the catheter in the urethral support in the utility model;
[0023] Figure 8 It is a sectional view of the trumpet mouth separated from the catheter in the urethral support in the utility model;
[0024] Figure 9 It is a front view of the trumpet mouth in the form of a spiral in the urethral support in the utility model.
[0025] The drawings show that: 1, support main body; 11, straight body; 12, trumpet mouth; 2, hydrophobic coating; 3, catheter. DETAILED DESCRIPTION
[0026] The technical scheme of the embodiments of the utility model will be explained and described below in combination with the drawings of the embodiments of the utility model, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor all belong to the protection scope of the utility model.
[0027] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like is the orientation or position relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation on the utility model.
[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise expressly defined.
[0029] In this utility model, unless otherwise explicitly 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 connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0030] Example 1:
[0031] like Figures 1 to 8 As shown in the figure, this embodiment illustrates a urethral stent, which includes a stent body 1 made of metal wire woven into a cylindrical structure. The stent body 1 includes a straight section 11 with a cylindrical structure and a flared end 12 at the end of the straight section 11. The diameter of the flared end 12 gradually decreases as it approaches the straight section 11. The flared end 12 and the straight section 11 are integrally woven from metal wire, which can increase the connection stability between the flared end 12 and the straight section 11, and also enhance the strength of the flared end 12, so that the flared end 12 can provide more stable support for the inner wall of the tissue. In addition, the integral weaving reduces the weaving difficulty of the stent body and helps to improve the weaving efficiency of the stent body.
[0032] In addition, in this embodiment, the metal wires at the straight section 11 are arranged in a spiral braid, and the metal wires at the flared end 12 are arranged in a W-shaped braid. This allows the flared end 12 to better conform to the inner wall of the urethra, thereby providing more stable and reliable support for the urethra. It also makes the positioning of the flared end 12 within the urethra more stable, reducing the possibility of the stent body shifting position and enabling the stent to play a better supporting role. Furthermore, the flared end 12 is elastic, allowing it to be better compressed, thereby reducing the maximum diameter of the flared end 12. This allows the stent body to be installed into the catheter 3, facilitating the delivery of the stent body to the lesion site by the catheter 3, making the installation of the stent body simpler and more convenient.
[0033] Of course, that's understandable. Figure 9As shown, in other embodiments, the metal wires at the trumpet mouth 12 can also be in a spiral weaving arrangement, that is, the weaving structure of the metal wires at the trumpet mouth 12 is the same as that of the metal wires at the straight section 11.
[0034] In order to further increase the strength of the straight section 11, the metal wires of the straight section 11 in this embodiment are in a close arrangement, that is, the metal wires always keep close during the spiral extension, reducing the gap between the metal wires, thereby increasing the overall strength of the straight section 11, and also providing stronger support for the trumpet mouth 12, so that the trumpet mouth 12 has higher load bearing capacity, so that the trumpet mouth 12 can stably support the inner wall of the tissue, and has a better support effect.
[0035] As shown, in this embodiment, the surface of the trumpet mouth 12 is coated with a hydrophobic coating 2, which can make the surface of the stent have hydrophobicity, thereby not being easy for bacteria to colonize, and can effectively reduce the phenomenon of urine scale organization on the surface of the stent. Of course, as shown, in other embodiments, the hydrophobic coating 2 can also be coated on the surface of the entire stent body, that is, the surfaces of the straight section 11 and the trumpet mouth 12 are coated with the hydrophobic coating 2; or, the water delivery coating can also be coated only on the surface of the stent body. Figure 2 Figure 3
[0036] As shown, in this embodiment, the water delivery coating can be coated on the outer surface of the stent body or the inner surface of the stent body, and of course, as shown, in other embodiments, the hydrophobic coating 2 can also be coated on the inner surface and the outer surface of the stent body. Figure 4 Figure 6 In this embodiment, the metal wires are made of nickel-titanium alloy, which has phase change characteristics and memory properties. The phase change temperature range is 5-20℃. When the temperature of the metal wires is not more than 5℃, the metal wires are in a martensite soft state. When the temperature of the metal wires is not less than 20℃, the metal wires are in an austenite rigid state. When the temperature of the stent body is below 5℃, the stent body as a whole becomes soft, so that the stent body is more easily taken out of the body, which helps to reduce the difficulty of taking out the stent body. In addition, when the temperature of the stent body is above 20℃, the stent body as a whole becomes hard and can remember the deformation state at this time, so that the trumpet mouth 12 can provide more stable and reliable support for the urethra, and the stent body has a better support effect. At the same time, when the stent body is in the urethra, the temperature is always above 20℃, so the stent body is not easy to become soft, reducing the possibility of position deviation of the stent. Secondly, the stent body does not need to be heated by hot water to open the trumpet mouth 12, which can reduce the harm to the human body.
[0037] In this embodiment, the metal wires are made of nickel-titanium alloy, which has phase change characteristics and memory properties. The phase change temperature range is 5-20℃. When the temperature of the metal wires is not more than 5℃, the metal wires are in a martensite soft state. When the temperature of the metal wires is not less than 20℃, the metal wires are in an austenite rigid state. When the temperature of the stent body is below 5℃, the stent body as a whole becomes soft, so that the stent body is more easily taken out of the body, which helps to reduce the difficulty of taking out the stent body. In addition, when the temperature of the stent body is above 20℃, the stent body as a whole becomes hard and can remember the deformation state at this time, so that the trumpet mouth 12 can provide more stable and reliable support for the urethra, and the stent body has a better support effect. At the same time, when the stent body is in the urethra, the temperature is always above 20℃, so the stent body is not easy to become soft, reducing the possibility of position deviation of the stent. Secondly, the stent body does not need to be heated by hot water to open the trumpet mouth 12, which can reduce the harm to the human body.
[0038] In this embodiment, during use, the stent body is first placed in a normal temperature environment above 20°C to make the metal wire of the stent body rigid, so that the flared end 12 can remain open and be shaped. The shaped stent body is then placed into the catheter 3, the diameter of which is smaller than the maximum diameter of the flared end 12. After the entire stent body is placed inside the catheter 3, the flared end 12 is compressed. Then, the catheter 3 containing the stent body is delivered into the diseased tissue. Subsequently, the catheter 3 is gradually withdrawn, allowing the stent body to be implanted into the human tissue. When the stent body is no longer restrained by the catheter 3, the flared end 12 rebounds to its original shape under its own elasticity, that is, the flared end 12 gradually opens, so that the end of the flared end 12 provides support to the human tissue, thereby fixing the stent.
[0039] When the stent body needs to be removed, the stent body is cooled by injecting 5°C cold water onto its surface, causing a phase transformation that converts it into a martensitic soft state. This makes the steel wire rope of the stent body softer, and then the metal wire at the rear end of the stent body is pulled and deformed, becoming a soft wire, so that the metal wire can be easily grasped and pulled out of the body by instruments such as gripping pliers.
[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.
Claims
1. A urethral stent, characterized by: The stent body comprises a cylindrical structure, and the stent body comprises a straight section and a trumpet mouth at the end of the straight section, the straight section is spirally woven by metal wires, the trumpet mouth is elastic and is spirally woven by metal wires, or the metal wires at the trumpet mouth are woven and arranged in a W shape.
2. The urethral stent of claim 1, wherein: The surface of the straight section and / or the trumpet mouth is coated with a hydrophobic coating.
3. The urethral stent of claim 2, wherein: The hydrophobic coating is coated on the outer surface of the straight section and / or the trumpet mouth; and / or the hydrophobic coating is coated on the inner surface of the straight section and / or the trumpet mouth.
4. The urethral stent of claim 1, wherein: The metal wires have a phase transition characteristic, the phase transition temperature range is 5-20 DEG C, the metal wires are in a martensite soft state when the temperature of the metal wires is not more than 5 DEG C, and the metal wires are in an austenite rigid state when the temperature of the metal wires is not less than 20 DEG C.
5. The urethral stent of claim 4, wherein: The metal wires are made of nickel-titanium alloy.
6. The urethral stent of claim 1, wherein: The metal wires of the straight section are closely arranged.