Spiral embedded wire composite ureteral stent

Abstract

The application discloses a spiral embedding metal wire composite ureteral stent, which comprises a main body and metal wires embedded in the main body, and the material of the main body is a high polymer elastic material; the main body comprises a supporting tube and fixed tubes located at two ends of the supporting tube, and the supporting tube extends along a first spiral curve to form a spiral supporting structure. The spiral embedding metal wire composite ureteral stent takes the high polymer elastic material as the main body, has good biocompatibility, and avoids causing discomfort or other complications to patients. The supporting tube extending along the first spiral curve forms a supporting structure, which can provide necessary supporting action at a serious narrow part; the metal wires extend along the first spiral curve in the spiral supporting structure, form a structure similar to a spring, and ensure that the spiral supporting structure can timely restore the spiral close arrangement after being placed into the ureter of a patient, so that the spiral embedding metal wire composite ureteral stent has sufficient supporting force and good biocompatibility.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a spiral-embedded metal wire composite ureteral stent. Background Technology

[0002] Ureteral stricture is a common urinary system disease, usually caused by a variety of factors, such as congenital malformations, trauma, postoperative sequelae, or inflammation. This condition obstructs the flow of urine between the kidneys and bladder, leading to hydronephrosis and even kidney failure. To address this problem, ureteral stent placement is widely used clinically to relieve symptoms and improve patients' quality of life.

[0003] However, existing ureteral stents are mainly made of two categories of materials: polymers and metals. Each has its own significant drawbacks: while polymers offer good biocompatibility and lower cost, their relatively soft nature may prevent them from providing sufficient support to maintain urethral patency in cases of severe ureteral stricture, especially malignant stricture. Metals, despite their high mechanical strength and ability to provide necessary support for severely narrowed areas, suffer from excessive rigidity leading to local tissue irritation and poor biocompatibility, potentially causing discomfort or other complications with long-term use. In short, existing ureteral stents fail to balance support and biocompatibility, hindering product promotion and application. Summary of the Invention

[0004] This invention provides a spiral-embedded metal wire composite ureteral stent that balances support and biocompatibility.

[0005] Specifically, the present invention provides a spiral-embedded metal wire composite ureteral stent, comprising a main body and a metal wire embedded in the main body, wherein the main body is made of a high-molecular elastic material;

[0006] The main body includes a support tube and fixed tubes located at both ends of the support tube. The support tube extends along a first spiral curve to form a spiral support structure. The fixed tubes are respectively used to be placed in the patient's renal pelvis and bladder.

[0007] Optionally, the pitch of the spiral support structure is less than 1 mm.

[0008] Optionally, the length of the spiral support structure is 1~20cm; the diameter of the spiral support structure is 6mm~10mm.

[0009] Optionally, there are multiple support tubes, which are spaced apart along the axial direction of the spiral support structure; each support tube forms one spiral support structure.

[0010] Optionally, the main body is provided with a first cavity and a second cavity. The first cavity extends along the length direction of the main body, and the internal space of the support tube and the fixing tube are both part of the first cavity. The second cavity is spaced apart from the first cavity, and the metal wire is disposed in the second cavity.

[0011] Optionally, the second cavity extends along the length of the body; or, the second cavity is arranged around the axial direction of the first cavity and extends along a second helical curve, the second helical curve surrounding the first cavity.

[0012] Optionally, there may be multiple second cavities, with intervals between them; the metal wires are arranged in a one-to-one correspondence with the second cavities.

[0013] Optionally, the main body is provided with a plurality of side holes, which are spaced apart along the length of the main body; the side holes communicate with the first cavity.

[0014] Optionally, the metal wire is made of nickel-titanium alloy; and / or the main body is made of one of polyurethane, polyolefin, and silicone rubber.

[0015] Optionally, the fixing tube has a fixed end and a connecting end, the connecting end being connected to the supporting tube; the fixed end extends along a second spiral curve to form a coiled fixing structure, the number of turns n of the coiled fixing structure satisfying: 0.5 < n < 1.5.

[0016] The beneficial effects of this invention are as follows:

[0017] The spiral-embedded metal wire composite ureteral stent provided by this invention uses a high-molecular elastic material as the main body of the stent, which has good biocompatibility and avoids causing discomfort or other complications to patients. The support tube extending along the first spiral curve forms a support structure, providing necessary support in severely stenotic areas. The metal wire also extends along the first spiral curve within the spiral support structure, forming a spring-like structure. This enhances the support while ensuring that the spiral support structure can promptly restore its tight spiral arrangement after insertion into the patient's ureter. Therefore, the spiral-embedded metal wire composite ureteral stent possesses both sufficient support and good biocompatibility. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic structural diagram of a spiral-embedded metal wire composite ureteral stent according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic cross-sectional view of a spiral-embedded metal wire composite ureteral stent according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic partial structural diagram of a spiral-embedded metal wire composite ureteral stent in one embodiment of the present invention.

[0022] In the figure: 100, main body; 101, first cavity; 102, second cavity; 103, side hole; 110, support tube; 120, fixing tube; 121, fixing end; 122, connecting end; 200, metal wire. Detailed Implementation

[0023] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] In the description of this invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0026] Figure 1 This is a schematic structural diagram of a spiral-embedded metal wire composite ureteral stent according to one embodiment of the present invention, as shown below. Figure 1 As shown, and refer to Figures 2 to 3 This invention provides a spiral-embedded metal wire composite ureteral stent, comprising a main body 100 and a metal wire 200 embedded in the main body 100. The main body 100 is made of a high-molecular elastic material. The main body 100 includes a support tube 110 and fixing tubes 120 located at both ends of the support tube 110. The support tube 110 extends along a first spiral curve to form a spiral support structure. The fixing tubes 120 are respectively used for placement in the patient's renal pelvis and bladder.

[0027] In this embodiment of the invention, the main body 100 of the helical embedded metal wire composite ureteral stent is made of a polymer elastic material, which has good biocompatibility and avoids causing discomfort or other complications to the patient. The support tube 110, extending along the first helical curve, forms a support structure that can provide necessary support in severely narrowed areas. The metal wire 200, also extending along the first helical curve within the helical support structure, forms a spring-like structure, which not only enhances the support to resist compression of the ureter by malignant or benign tumors, but also ensures that the helical support structure can promptly restore its tight helical arrangement after insertion into the patient's ureter. This ensures that the helical embedded metal wire composite ureteral stent has both sufficient support and good biocompatibility. Furthermore, the polymer elastic material encapsulating the metal wire 200 prevents metal leaching from the wire, avoiding any impact on the patient.

[0028] In application, the fixed tubes 120 at both ends are located in the patient's renal pelvis and bladder, respectively, so that the spiral support structure is located in the ureter, so that the patient's urine can flow into the bladder through the internal space of the spiral support structure.

[0029] It should be noted that the spiral-embedded metal wire composite ureteral stent of the present invention is an improvement on the existing ureteral stent. Specifically, the embodiments of the present invention provide a ureteral stent comprising a main body 100 and a metal wire 200 embedded within the main body 100. The main body 100 is made of a high-polymer elastic material. The main body 100 includes a support tube 110 and fixing tubes 120 located at both ends of the support tube 110. The support tube 110 extends along a first spiral curve to form a spiral support structure. The fixing tubes 120 are respectively used for placement in the patient's renal pelvis and bladder.

[0030] In one embodiment of the present invention, the pitch of the spiral support structure is less than 1 mm, such that any two adjacent turns of the spiral support structure are closely arranged, hindering the inward growth of the ureteral intima. Preferably, the pitch of the spiral support structure is less than 0.4 mm.

[0031] In one embodiment of the present invention, the length of the spiral support structure is 1-20 cm; the diameter of the spiral support structure is 6 mm-10 mm. Because the diameter of the spiral support structure is 6 mm-10 mm, it can provide sufficient support within the ureter, effectively preventing further collapse or blockage of the ureteral stenosis. The diameter of the fixing tube 120 is much smaller than the diameter of the support structure, facilitating its movement within the ureter and allowing the support structure to be positioned at the designated location.

[0032] In one embodiment of the present invention, there are multiple support tubes 110, which are spaced apart along the axial direction of the spiral support structure, and each support tube 110 forms a spiral support structure. When there are multiple narrowing sites in the patient's ureter, each spiral support structure provides support at a narrowing site, preventing further collapse or blockage of the narrowing site of the ureter.

[0033] like Figure 2 As shown, in one embodiment of the present invention, the main body 100 is provided with a first cavity 101 and a second cavity 102. The first cavity 101 extends along the length direction of the main body 100, and the internal spaces of the support tube 110 and the fixing tube 120 are both part of the first cavity 101. The second cavity 102 is spaced apart from the first cavity 101, and the metal wire 200 is disposed in the second cavity 102. Further, the metal wire 200 is made of nickel-titanium alloy.

[0034] like Figure 3As shown, by incorporating a metal wire in the second cavity 102, the metal wire forms a spiral structure identical to the support structure within the support structure. This enhances support while ensuring that the support tube 110 promptly returns to its spiral structure after the spiral-embedded metal wire composite ureteral stent is inserted into the body. Furthermore, the metal wire prevents deformation of the spiral structure due to ureteral peristalsis and gravity, which could cause the spiral-embedded metal wire composite ureteral stent to sag excessively into the bladder, increasing patient discomfort. Simultaneously, the patient's urine can flow through the first cavity 101, thereby improving or alleviating urinary difficulties caused by malignant ureteral stenosis. Therefore, the spiral-embedded metal wire composite ureteral stent of this embodiment not only ensures the support strength of the stent but also improves the patient's user experience.

[0035] Furthermore, the nickel-titanium alloy has a shape memory effect, which allows the metal wire 200 to automatically return to its original shape, thus ensuring that the spiral support structure can promptly restore its tight spiral arrangement after being inserted into the patient's ureter.

[0036] In one embodiment of the present invention, the second cavity 102 extends along the length of the body 100; or, the second cavity 102 extends about the axial direction of the first cavity 101 and along a second helical curve, the second helical curve surrounding the first cavity 101.

[0037] In one embodiment of the present invention, there are multiple second cavities 102, which are spaced apart; the metal wires 200 are arranged in a one-to-one correspondence with the second cavities 102. Because multiple metal wires are arranged within the main body 100, the supporting effect of the spiral-embedded metal wire composite ureteral stent can be further improved.

[0038] In one embodiment of the present invention, the main body 100 is provided with a plurality of side holes 103, which are spaced apart along the length of the main body 100; the side holes 103 communicate with the first cavity 101. The main function of the side holes 103 is to drain urine, allowing the patient's urine to enter the first cavity 101 through the side holes 103. This facilitates the drainage of urine between the inner wall of the narrowed area of ​​the ureter and the spiral-embedded metal wire composite ureteral stent, further improving or alleviating the difficulty in urination caused by malignant ureteral stenosis.

[0039] In one embodiment of the present invention, the main body 100 is made of one of polyurethane, polyolefin, and silicone rubber. These materials have good biocompatibility and avoid causing discomfort or other complications to the patient. Therefore, their comfort level is far superior to that of metal stents.

[0040] In one embodiment of the present invention, the fixing tube 120 includes a fixing end 121 and a connecting end 122, the connecting end 122 being connected to the support tube 110; the fixing end 121 extends along a second spiral curve to form a coiled fixing structure, the number of turns n of the coiled fixing structure satisfying: 0.5 < n < 1.5; the diameter of the coiled fixing structure is larger than the diameter of the ureter. In application, the coiled fixing structures at both ends are located in the patient's renal pelvis and bladder, respectively, so that the spiral support structure is located in the ureter. The coiled fixing structures at both ends can prevent displacement of the spiral-embedded metal wire composite ureteral stent during peristalsis within the patient's ureter; the spiral support structure has a tight spiral structure with high support strength, and the tightly arranged metal wires maintain the stability of the spiral support structure, allowing the patient's urine to flow into the bladder through the inner ring and the first cavity 101 of the support structure. Furthermore, the coiled fixing structure has no sharp edges, which not only provides better fixation but also provides a relatively gentle contact with the patient, reducing discomfort during use.

[0041] In one embodiment of the present invention, rheological treatment is performed at the openings of the two fixed ends 121 that are opposite to each other, so that the second cavity 102 remains closed and the metal wire is prevented from shifting or falling off.

[0042] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A spiral-embedded metal wire composite ureteral stent, characterized in that, It includes a main body and metal wires embedded in the main body, wherein the main body is made of a high-molecular elastic material; The main body includes a support tube and fixed tubes located at both ends of the support tube. The support tube extends along a first spiral curve to form a spiral support structure, which is a tight spiral structure. The fixation tubes are respectively used to be placed in the patient's renal pelvis and bladder; The main body is provided with a first cavity and a second cavity. The first cavity extends along the length of the main body, and the internal space of the support tube and the fixing tube are both part of the first cavity. The second cavity is spaced apart from the first cavity, and the metal wire is disposed in the second cavity. The second cavity extends along the length of the body.

2. The spiral-embedded metal wire composite ureteral stent according to claim 1, characterized in that, The pitch of the spiral support structure is less than 1 mm.

3. The spiral-embedded metal wire composite ureteral stent according to claim 1, characterized in that, The length of the spiral support structure is 1~20cm; the diameter of the spiral support structure is 6mm~10mm.

4. The spiral-embedded metal wire composite ureteral stent according to claim 1, characterized in that, The number of support tubes is multiple, and the multiple support tubes are spaced apart along the axial direction of the spiral support structure; each support tube forms a spiral support structure.

5. The spiral-embedded metal wire composite ureteral stent according to claim 1, characterized in that, There are multiple second cavities, which are spaced apart; the metal wires are arranged in a one-to-one correspondence with the second cavities.

6. The spiral-embedded metal wire composite ureteral stent according to claim 1, characterized in that, The main body is provided with a plurality of side holes, which are spaced apart along the length of the main body; the side holes communicate with the first cavity.

7. The spiral-embedded metal wire composite ureteral stent according to claim 1, characterized in that, The metal wire is made of nickel-titanium alloy; and / or the main body is made of one of polyurethane, polyolefin, or silicone rubber.

8. The spiral-embedded metal wire composite ureteral stent according to claim 1, characterized in that, The fixing tube has a fixed end and a connecting end, the connecting end being connected to the supporting tube; the fixed end extends along a second spiral curve to form a coiled fixing structure, the number of turns n of the coiled fixing structure satisfying: 0.5 < n < 1.5.

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