CN-115844610-B - Vascular stent conveying device and conveying method

CN115844610BCN 115844610 BCN115844610 BCN 115844610BCN-115844610-B

Abstract

The invention provides a vascular stent conveying device and a vascular stent conveying method, wherein the vascular stent conveying device comprises a pushing component, a constraint catheter and an outer sleeve component which are sequentially nested from inside to outside, the constraint catheter comprises a delivery part positioned at the proximal end and a constraint part positioned at the distal end, the outer sleeve component is rotatably sleeved on part of the outer surface of the delivery part, the pushing component comprises a limiting main pipe, the proximal end of the limiting main pipe is positioned in the delivery part, the distal end of the limiting main pipe extends out of the constraint part, a tubular stent is sleeved on part of the peripheral wall of the limiting main pipe positioned in the constraint part, so that the tubular stent is contained in the constraint part, and the constraint catheter moves along the axial direction of the limiting main pipe so as to release the containing of the tubular stent. The invention adopts the coaxial multilayer structure design, has good support and is easier to pass through lesions.

Inventors

HAN SIJIE
Request for anonymity
Request for anonymity

Assignees

上海畅德医疗科技有限公司

Dates

Publication Date: 20260508
Application Date: 20221229

Claims (20)

1. The vascular stent conveying device is characterized by comprising a pushing component, a constraint catheter and a jacket component which are sequentially nested from inside to outside, wherein the pushing component is used for supporting a tubular stent, and the constraint catheter is used for accommodating the pushing component loaded with the tubular stent; The utility model provides a restraint catheter, including the restraint catheter is located the delivery portion of proximal end and is located the restraint portion of distal end, the overcoat subassembly rotationally overlaps and locates the partial surface of delivery portion, the overcoat subassembly can carry out circumferential rotation for the restraint catheter, the propelling movement subassembly includes spacing main pipe, the proximal end of spacing main pipe is located in the delivery portion, the distal end of spacing main pipe stretches out the restraint portion, tubular support cover is located the spacing main pipe is located partial perisporium in the restraint portion for tubular support accomodates in the restraint portion, restraint catheter moves along the axial of spacing main pipe in order to release the accomodate of tubular support, restraint catheter is the reducing structure, the internal diameter of restraint portion is greater than the internal diameter of delivery portion; the pushing assembly further comprises an ejection main pipe positioned in the delivery part, the ejection main pipe is nested and arranged at the proximal end of the limiting main pipe, the distal end of the ejection main pipe is further provided with a protruding part, and the ejection main pipe and the limiting main pipe are melted to obtain an integrally formed special-shaped pipe; The convex part comprises a first developing part, a coating part and a filling part, wherein the material of the first developing part comprises any one or the combination of at least two of tantalum, gold, platinum or platinum alloy, the coating part is a coating pipe with a tubular structure, the coating pipe is arranged around the far end of the ejection main pipe, a smooth surface is obtained after thermal shrinkage, the friction resistance is reduced, and the filling part comprises a high polymer material doped with a developing substance.
2. The stent delivery device of claim 1, wherein the diameter of the projection is greater than or equal to the diameter of the ejector main tube.
3. The vascular stent delivery device of claim 1, wherein the material of the cover comprises a heat shrink material.
4. The vascular stent delivery device of claim 1, wherein a hollow cavity is formed in the limiting main tube, the hollow cavity is used for accommodating a wire, and a guide part is arranged at one end of the limiting main tube extending out of the binding part.
5. The stent delivery device of claim 4, wherein the limit host tube is integrally formed with the guide portion.
6. The stent delivery device of claim 4, wherein the constraining main tube and the guide portion are secured by an adhesive, welding, or a chimeric connection.
7. The stent delivery device of claim 6, wherein the guide portion is a tapered structure.
8. The stent delivery device of claim 7, wherein the constraining main tube comprises a polymeric single tube or a composite tube.
9. The vascular stent delivery device of claim 8, wherein the polymeric single tube comprises any one of PEEK, pebax, or PA 12.
10. The stent delivery device of claim 8, wherein the composite tube comprises a substrate having an outer surface provided with at least one protective layer.
11. The vascular stent delivery device of claim 10, wherein the substrate comprises PTFE.
12. The stent delivery device of claim 11, wherein the guide portion comprises any one or a combination of at least two of PU, pebax, tungsten powder, and barium sulfate.
13. The vascular stent delivery device of claim 1, wherein the constraining catheter is a single layer catheter or a composite catheter of at least two layers.
14. The stent delivery device of claim 13, wherein the distal end of the tether is provided with a second visualization element.
15. The stent delivery device of claim 14, wherein the constraining catheter is a three-layered composite catheter, comprising an inner tube, an intermediate tube, and an outer tube in order from inside to outside.
16. The stent delivery device of claim 15, wherein the inner tube comprises any one or a combination of at least two of high density polyethylene, nylon, polytetrafluoroethylene, silicone, or polyether block amide.
17. A vascular stent delivery device as in claim 15, wherein the intermediate tube is formed from a high molecular polymer and/or a wire spiral braid.
18. The vascular stent delivery device of claim 15, wherein the intermediate tube is formed from a high molecular polymer and/or wire wrap.
19. The stent delivery device of claim 15, wherein the outer tube comprises any one or a combination of at least two of high density polyethylene, nylon, polytetrafluoroethylene, silicone, or polyether block amide.
20. The stent delivery device of claim 1, wherein the constrained portion has an outer diameter greater than an inner diameter of the outer jacket assembly.

Description

Vascular stent conveying device and conveying method Technical Field The invention belongs to the technical field of medical appliances, and relates to a conveying device and a conveying method of a vascular stent. Background Arteriosclerosis obliterans of lower limbs are common diseases of vascular surgery, and the main cause is atherosclerosis of lower limbs, so that the blood vessels are narrow and occluded, the blood supply is insufficient, the limbs are chronically ischemic, and even amputation occurs to serious patients. Compared with the traditional arteria intima stripping operation, the percutaneous transluminal stent forming operation has the advantages of short operation time, small wound, less postoperative complications and the like, and can effectively dilate a narrow blood vessel and restore normal blood circulation. In percutaneous transluminal stent forming surgery, poor stent release systems often suffer from problems of stent release deformation, kinking, bending, displacement, etc. In addition, in the process of releasing the stent, the conventional stent conveying system in the current market has the defects that the long stent is not completely released in the releasing process due to the insufficient pushing force, and the release is completed by a manual pull rod. However, the release at two different stages can increase risks such as stent release deformation, kinking, fracture and the like, so that the operation difficulty of doctors is improved, and higher risks are brought to patients. It is therefore very important to provide a delivery device that is simple to operate and avoids the problem of stent release deformation. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a vascular stent conveying device and a vascular stent conveying method, which adopt a coaxial four-layer structural design, have good supporting property, are easier to pass through lesions, and simultaneously reduce the risks of unstable release due to torsion adaptation and overall system distortion in the traditional design. To achieve the purpose, the invention adopts the following technical scheme: In a first aspect, the invention provides a vascular stent conveying device, which comprises a pushing component, a binding catheter and a jacket component, wherein the pushing component, the binding catheter and the jacket component are sequentially nested from inside to outside, the pushing component is used for supporting a tubular stent, and the binding catheter is used for accommodating the pushing component loaded with the tubular stent; The utility model provides a restriction pipe, including the delivery portion that is located the proximal end and be located the restriction portion of distal end, the overcoat subassembly rotationally overlaps to be located the partial surface of delivery portion, the push assembly includes spacing main pipe, the proximal end that spacing is responsible for is located in the delivery portion, the distal end that spacing is responsible for stretches out restriction portion, the tubular support cover is located spacing main pipe is located partial perisporium in the restriction portion for tubular support accomodates in the restriction portion, restriction pipe is followed the axial displacement of spacing main pipe is with the accomodating of release tubular support. According to the vascular stent conveying device provided by the invention, the pressed tubular stent is arranged on the limiting main pipe, the binding catheter is sleeved on the periphery of the limiting main pipe loaded with the tubular stent, and the pushing component and the binding catheter are of a mutually nested structure, so that the supporting performance is improved, and the vascular stent conveying device is easier to pass through a lesion part. One end of the limiting main pipe extending out of the constraint catheter plays a role in guiding, so that the whole conveying device can accurately reach a lesion part. Before reaching the lesion site, the tubular stent is in a contracted state and is contained in the binding part, after reaching the lesion site, the binding catheter is retracted, the tubular stent is released, the tubular stent is restored to an expanded state, and the delivery of the stent is completed. The outer sleeve assembly provides torque and strong support while providing a lower surface coefficient of friction, reducing drag. In the present invention, the proximal end refers to an end facing the operator during surgery, and the distal end refers to an end facing the patient. As a preferable technical scheme of the invention, the pushing assembly further comprises an ejection main pipe positioned in the delivery part, the ejection main pipe is nested and arranged at the proximal end of the limiting main pipe, and the distal end of the ejection main pipe is further provided with a protruding part. Preferably, the diameter of th