Search

CN-116407367-B - Covered stent and stent system

CN116407367BCN 116407367 BCN116407367 BCN 116407367BCN-116407367-B

Abstract

The invention relates to a covered stent and a stent system, the covered stent comprises a stent main body, a covered film and a plurality of anchor knots arranged on the stent main body, the covering film covers the bracket main body, and the free end of the anchor is covered with a detachable protective sleeve. The stent system comprises a front covered stent and a sheath, wherein the inner diameter of the sheath is larger than the outer diameter of the stent main body in a natural state, and the covered stent and the stent system provided by the invention are characterized in that a detachable protective sleeve is additionally arranged at the free end of an anchor, thereby avoiding the risk of the free ends of the anchors contacting and piercing the stacked and mutually pressed covers during sheathing, and further avoiding the problem of overall failure of the implant due to damage to the covers.

Inventors

  • HUANG WANGXING
  • LIU GUOLIANG
  • LIU CAIPING

Assignees

  • 先健科技(深圳)有限公司

Dates

Publication Date
20260512
Application Date
20211231

Claims (11)

  1. 1. The coated stent comprises a stent main body, a coated film and an anchor spike arranged on the stent main body, wherein the stent main body comprises a natural state which is not subjected to other external forces and a compressed state which is loaded completely; in a compressed state, the protective sleeve is sleeved on the surface of the covering film, and the protective sleeve isolates the free end of the anchor and the covering film.
  2. 2. The stent graft of claim 1, wherein said protective sheath is selected from the group consisting of silicone and rubber materials.
  3. 3. The stent graft of claim 1, wherein said protective sheath comprises a plurality of protective elements, said anchor being a plurality of said protective elements, said protective elements being disposed over and covering the free ends of said anchor, respectively.
  4. 4. A stent system comprising the stent graft of any one of claims 1-3, further comprising a sheath having an inner diameter less than the outer diameter of the stent body in its natural state.
  5. 5. The stent system of claim 4, wherein a reduced diameter section is provided at the outlet of the sheath, the reduced diameter section having a minimum diameter less than the outer diameter of the protective sheath.
  6. 6. The stent system of claim 4, wherein an adhesive is provided on an inner wall of the sheath, the adhesive limiting movement of the protective sheath toward the outlet of the sheath.
  7. 7. The stent system of claim 4, wherein the inner wall of the sheath is provided with grooves disposed in correspondence with the protective sheath, the grooves restricting movement of the protective sheath toward the outlet of the sheath.
  8. 8. The stent system of claim 4 wherein the protective sheath comprises a catch plate extending toward the proximal end of the stent graft.
  9. 9. The bracket system of claim 8, wherein the clip is angled from the axis by 30-60 °.
  10. 10. The stent system of claim 7, wherein the groove extends toward an outlet of the sheath.
  11. 11. The stent system of claim 4 wherein the protective sheath has a pull wire attached to its distal end.

Description

Covered stent and stent system Technical Field The invention relates to the technical field of interventional medical instruments, in particular to a covered stent and a stent system. Background With the rapid rise in the incidence of hypertension, the incidence of arterial-related diseases has increased significantly, and it is expected that the incidence will increase at a rate of more than 40% in the coming 5 to 7 years. Among them, acute Stanford a aortic dissection (acute aorticdissect n type a, AADA for short) is the most common and most critical aortic emergency in the field of cardiovascular surgery. If untreated, the mortality rate of one week after AADA onset is up to 50-91%, if only internal medicine conservation treatment is received, the 24-hour mortality rate is up to 20%, and the 48-hour mortality rate is up to 30%. Thus, AADA-diagnosed, if there is no surgical contraindication, an emergency surgical intervention is necessary. However, even under modern medical conditions, perioperative mortality rates are as high as 15-35%. At present, a minimally invasive endovascular intervention isolation operation can be adopted for treating the diseases, specifically, a covered stent is implanted in a blood vessel to isolate blood flow from aortic dissection, and when the covered stent is used, the unstressed stent in a natural state is usually required to be compressed and loaded into a sheath so as to be transported to a designated position through the sheath and released. In the loading process of the covered stent, the stent is converted from a natural state to a compressed state. After the stent is transported to the designated location, the stent is released from the sheath and the stent is transitioned from the compressed state to the natural state. Because the existing covered stent generally increases the anchoring capability of the covered stent in the human blood vessel by arranging anchor spines, the manufacturing process generally comprises the steps of firstly covering the inner surface and the outer surface of the bare stent with a film, then penetrating the anchor spines out of the outer surface of the covered film by a special tool, and finally performing covered film heat treatment to bond the covered film and the bare stent together. However, in the prior art, since the anchor has the pointed end, when the covered stent is sheathed, the anchor is extruded by the sheath tube, the pointed end of the anchor is close to the axis direction, and the stacked and mutually extruded covered films are easy to contact and pierce. Disclosure of Invention Based on the above, the invention provides a covered stent and a stent system, which are used for solving the problems that the covered stent is easy to anchor and the covered film of the root of the anchor is separated in the releasing process. The invention provides a covered stent, which comprises a stent main body, a covered film and an anchor arranged on the stent main body, wherein the stent main body comprises a natural state which is not subjected to other external forces and a compression state which is loaded completely. In one embodiment, the protective sleeve is sleeved on the surface of the covering film, and the protective sleeve isolates the free end of the anchor from the covering film. In one embodiment, the protection sleeve comprises a plurality of protection units, and the anchor knots are respectively sleeved with the protection units and cover the free ends of the anchor knots. A stent system comprising the stent graft described above, further comprising a sheath having an inner diameter greater than the outer diameter of the stent body in its natural state. In one embodiment, a reduced diameter section is provided at the outlet of the sheath, the reduced diameter section having a minimum diameter less than the outer diameter of the protective sheath. In one embodiment, an adhesive portion is provided on the inner wall of the sheath, the adhesive portion limiting movement of the protective sheath toward the outlet of the sheath. In one embodiment, a groove corresponding to the protective sleeve is formed in the inner wall of the sheath, and the groove limits the movement of the protective sleeve towards the outlet of the sheath. In one embodiment, the protective sheath includes a catch plate extending toward the proximal end of the stent graft. In one embodiment, the angle between the clamping plate and the axis is 30-60 degrees. In one embodiment, the groove extends towards the outlet of the sheath. In one embodiment, the end of the protective sleeve is connected with a pull wire. According to the covered stent and the stent system, the detachable protective sleeve is additionally arranged at the free end of the anchor, so that the risks that the free end of the anchor contacts with and pierces the stacked and mutually extruded covered films in the sheathing process are avoided, and the problem that the whole implant is inva