CN-119970316-B - Spiral embedded metal wire composite ureteral stent

Abstract

The invention discloses a spiral embedded metal wire composite ureteral stent which comprises a main body and metal wires embedded in the main body, wherein the main body is made of high polymer elastic materials and comprises a support tube and fixed tubes positioned at two ends of the support tube, and the support tube extends along a first spiral curve to form a spiral support structure. The spiral embedded metal wire composite ureteral stent takes a high polymer elastic material as a main body, has good biocompatibility, and avoids discomfort or other complications to patients. The support tube extending along the first spiral curve forms a support structure, so that necessary support effect can be provided at a severely narrow part, the metal wire also extends along the first spiral curve in the spiral support structure to form a structure similar to a spring, the support effect is enhanced, and the spiral support structure can be ensured to restore spiral tight arrangement in time after being placed into a patient ureter, so that the spiral embedding metal wire composite ureter stent has enough support force and good biocompatibility.

Inventors

• LI JUNBAO
• HUA YOULU
• MAO YANFA
• HAN YAXIONG

Assignees

• 深圳库珀医疗股份有限公司

Dates

Publication Date

20260508

Application Date

20250120

Claims (8)

1. 1. The spiral embedded metal wire composite ureteral stent is characterized by comprising 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 comprises a supporting tube and fixed tubes positioned at two ends of the supporting tube, the supporting tube extends along a first spiral curve to form a spiral supporting structure, and the spiral supporting structure is of a tight spiral structure; the fixed tube is used for being arranged in the renal pelvis and the bladder of a patient respectively; 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 inner spaces of the support tube and the fixing tube are part of the first cavity; the second cavity extends along a length of the body.
2. 2. The spiral-embedded wire composite ureteral stent according to claim 1, characterized in that the pitch of the spiral support structure is less than 1mm.
3. 3. The spiral-embedded metal wire composite ureteral stent according to claim 1, characterized in that the length of the spiral supporting structure is 1-20 cm, and the diameter of the spiral supporting structure is 6-10 mm.
4. 4. The spiral-embedded wire composite ureteral stent of claim 1, wherein the number of support tubes is a plurality, the plurality of support tubes being spaced apart along the axis of the spiral support structure, each support tube forming one of the spiral support structures.
5. 5. The spiral-embedded metal wire composite ureteral stent according to claim 1, wherein the number of the second cavities is a plurality, the second cavities are arranged at intervals, and the metal wires are arranged in one-to-one correspondence with the second cavities.
6. 6. The spiral-embedded metal wire composite ureteral stent according to claim 1, characterized in that a plurality of side holes are formed in the main body, the side holes are formed at intervals along the length direction of the main body, and the side holes are communicated with the first cavity.
7. 7. The spiral-embedded wire composite ureteral stent according to claim 1, characterized in that the wire is made of nickel-titanium alloy, and/or the main body is made of one of polyurethane, polyolefin, and silicone rubber.
8. 8. The spiral-embedded wire composite ureteral stent according to claim 1, characterized in that the fixed tube has a fixed end and a connection end, the connection end being in communication with the support tube, the fixed end extending along a second spiral curve to form a coiled fixation structure, the number of turns n of the coiled fixation structure satisfying 0.5< n <1.5.

Description

Spiral embedded metal wire composite ureteral stent Technical Field The invention relates to the field of medical appliances, in particular to a spiral embedded metal wire composite ureteral stent Background Ureteral stenosis is a common urinary system disorder, and is usually caused by various causes, such as congenital deformity, trauma, surgical sequelae, inflammation, etc. This disease can cause a blockage in urine flow between the kidneys and the bladder, which can lead to hydronephrosis and even renal failure. To solve this problem, a method of implanting ureteral stents is widely used clinically to relieve symptoms and improve the quality of life of patients. However, the materials of the existing ureteral stent mainly comprise two major types of high polymer materials and metal materials, but the high polymer materials have obvious defects respectively, and the high polymer materials have good biocompatibility and lower cost advantages, but can not provide enough supporting force to keep the urethra clear when facing severe ureteral stenosis, especially malignant stenosis due to the relatively soft characteristic. Although the metal material has strong mechanical strength and can provide necessary supporting effect for severe stenosis, the metal material also has local tissue irritation problem caused by excessive hardness and poor biocompatibility, and discomfort or other complications can be caused to patients after long-term use. That is, the existing ureteral stent cannot take the supporting function and the biocompatibility into account, and is not beneficial to product popularization and application. Disclosure of Invention The embodiment of the invention provides a spiral embedded metal wire composite ureteral stent, which is used for taking the supporting effect and biocompatibility into consideration. Specifically, the invention provides a spiral embedded metal wire composite ureteral stent, which comprises a main body and metal wires embedded in the main body, wherein the main body is made of a high-molecular elastic material; the body comprises a support tube and fixing tubes at two ends of the support tube, wherein the support tube extends along a first spiral curve to form a spiral support structure, and the fixing tubes are respectively arranged in a renal pelvis and a bladder of a patient. Optionally, the pitch of the helical support structure is less than 1mm. Optionally, the length of the spiral supporting structure is 1-20 cm, and the diameter of the spiral supporting structure is 6-10 mm. Optionally, the number of the supporting tubes is multiple, the supporting tubes are arranged at intervals along the axial direction of the spiral supporting structure, and each supporting tube forms one spiral supporting structure. 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, the inner spaces of the support tube and the fixing tube are part of the first cavity, the second cavity and the first cavity are arranged at intervals, and the metal wire is arranged in the second cavity. Optionally, the second cavity extends along the length of the body, or the second cavity is disposed axially about the first cavity and extends along a second helical curve that surrounds the first cavity. Optionally, the number of the second cavities is multiple, the second cavities are arranged at intervals, and the metal wires are arranged in one-to-one correspondence with the second cavities. Optionally, the main body is provided with a plurality of side holes, the side holes are arranged at intervals along the length direction of the main body, and the side holes are communicated with the first cavity. 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. Optionally, the fixed pipe is provided with a fixed end and a connecting end, the connecting end is communicated with the supporting pipe, the fixed end extends along a second spiral curve to form a curled fixed structure, and the number of turns n of the curled fixed structure is 0.5< n <1.5. The invention has the beneficial effects that: the spiral embedding metal wire composite ureteral stent provided by the invention has the advantages that the main body of the spiral embedding metal wire composite ureteral stent is made of the high polymer elastic material, the high polymer elastic material has good biocompatibility, discomfort or other complications to a patient are avoided, the support tube extending along the first spiral curve forms a support structure, the necessary support effect can be provided at a severely narrow part, the metal wire also extends along the first spiral curve in the spiral support structure to form a structure similar to a spring, the support effect is enhanced, and the spiral support structure can be ensured to recover the spiral compact arran