CN107157615B - Covered stent - Google Patents

Abstract

The invention discloses a covered stent, and belongs to the field of medical instruments. A covered stent consists of two stent units, wherein each stent unit consists of a multi-circle metal stent, a covered membrane coated on the surface of the multi-circle metal stent and a metal bare stent connected with the top end of the multi-circle metal stent, and at least one annular membrane is arranged on the periphery of the covered membrane at the near end of each stent unit. The invention has the advantages that: the invention adopts two position-adjustable covered stent units, has simple operation, easy release, can be completed by direct puncture, has small wound, is not easy to shift, has very high success rate of the operation, reduces the pain of patients, has reliable effect and can better protect renal arteries; the adherence between the covered stent and the blood vessel is good, gaps or gaps between the stent and the blood vessel at partial positions are effectively avoided, and the incidence rate of inner leakage is reduced.

Description

Covered stent

Technical Field

The invention relates to a novel covered stent, and belongs to the field of medical instruments.

Background

The traditional covered stent for treating abdominal aortic aneurysm in cavity is a structure composed of a main body peritoneal stent and a branch peritoneal stent, and also has an individual integrated covered stent comprising an abdominal aorta and a double iliac artery branch.

The internal leakage is the most common complication of the intracavity treatment of aortic aneurysm, namely the phenomenon that blood continuously flows into a false cavity in various ways after the covered stent is implanted, and the root cause is that the communication between a tumor cavity and arterial blood flow cannot be completely isolated after the stent is released. Continued endoleak can lead to increased hemangioma, thinning of the vessel wall, and even rupture, ultimately leading to death of the patient.

The most serious defects of the existing tectorial membrane bracket in design are that the operation is complex and the release is difficult in the operation. At present, a covered stent which is simple to operate and can effectively reduce the phenomenon of internal leakage is not available.

In addition, at present, for abdominal aortic aneurysms close to renal arteries, due to the short neck of the aneurysm, the repair by a conventional covered stent cannot be realized, a branch vessel stent or a windowing technology or a chimney technology needs to be adopted, the three technologies are very complicated to operate, one side of the renal artery sometimes has to be sacrificed, and then hypertension appears after the operation of a patient, and renal failure appears in severe cases.

Disclosure of Invention

The invention aims to provide a novel covered stent which is simple to operate, convenient to release, capable of reducing the occurrence of internal leakage and better protecting renal arteries.

In order to realize the purpose, the invention adopts the following technical scheme:

a covered stent consists of two stent units, wherein each stent unit consists of a multi-circle metal stent, a covered membrane coated on the surface of the multi-circle metal stent and a metal bare stent connected with the top end of the multi-circle metal stent, and at least one annular membrane is arranged on the periphery of the covered membrane at the near end of each stent unit.

The annular membrane is arranged at a distance of 0.5cm-2cm, preferably 0.5cm-1.5cm, most preferably 0.5cm-1cm from the upper edge of the membrane.

The present invention employs two stent units, whose positions during surgery are individually adjustable. According to our study, the two renal arteries of 90% of patients are not in the same plane. When the two stent units are released, the positions of the covered stents can be easily adjusted according to the position of the renal artery, and the two sides of the covered stents are not placed on the same plane, so that the occurrence of internal leakage can be effectively avoided, and a better effect of sealing and isolating aneurysm is achieved.

The thickness of the annular membrane is 1mm-2mm, preferably 2mm; the width is 1mm to 3mm, preferably 2mm.

The number of the annular diaphragms is 1-3, preferably 2, the distance between two adjacent annular diaphragms is 1mm-3mm, preferably 2mm, and the selection of the distance depends on the height of the annular diaphragms. In the operation, the annular diaphragm of two support units passes through the annular diaphragm overlap joint that coincide each other, or unsmooth inlay mutually, makes two support units link together and become complete tectorial membrane support, and this tectorial membrane support is whole closely to be laminated on the vascular wall simultaneously to effectively isolated blood vessel and tumor chamber take place to "interior hourglass". The number of annular diaphragms on each support unit may be the same or different. For example, both support units are provided with 1 or 2 annular diaphragms; or the support unit on one side is 1 annular membrane, and the support unit on the other side is 2 annular membranes; or the support unit on one side is 2 annular membranes, and the support unit on the other side is 3 annular membranes; the larger the number of the annular diaphragms, the better the effect of connecting and sealing the tumor cavity.

The far end of the bracket unit is in a straight cylinder shape or a gradually expanded horn mouth shape.

The covering film and the annular diaphragm are made of high polymer materials with good biocompatibility, including but not limited to polytetrafluoroethylene, terylene, polyester, polyurethane and the like, so that blood is guaranteed to flow to the far end of an artery, and aneurysm is isolated.

The metal bare stent is provided with an anti-falling fixing structure, such as a barb, and is used for fixing the covered stent on the wall of the aorta. The main purpose of the metal bare stent is to prevent the covered stent from influencing blood flow on the contralateral side, maintain certain tension and provide partial radial supporting force.

The multiple circles of metal stents are sequentially arranged along the axial direction of the covering film, and each circle of metal stent can elastically deform along the radial direction of the covering film. The multi-ring metal support is formed by processing alloy wires and consists of a plurality of closed cylindrical structures of waveform units.

The alloy wire is made of metal materials such as stainless steel, memory alloy and the like.

The invention has the advantages that: the invention adopts two position-adjustable covered stent units, has simple operation, easy release, can be completed by direct puncture, has small wound, difficult displacement, very high success rate of the operation, reduces the pain of patients, has reliable effect and can better protect renal artery; the tectorial membrane support is good with the adherence of blood vessel, effectively avoids producing gap or space between support and the blood vessel on some positions, reduces "interior hourglass" incidence.

The technical solutions of the present invention are described in detail below with reference to the accompanying drawings and the detailed description, and the scope of the invention is not limited thereto, and all equivalent substitutions in the field according to the disclosure of the present invention are within the scope of the present invention.

Drawings

FIG. 1 is a schematic view of a structure of a stent unit according to embodiment 1

FIG. 2 is a reference diagram showing the state of use of embodiment 1

FIG. 3 is a schematic view of a structure of a stent unit according to embodiment 2

FIG. 4 is a reference diagram showing the state of use of embodiment 2

Detailed Description

Example 1

Referring to fig. 1 and 2, the covered stent comprises two stent units, wherein each stent unit comprises amulti-circle metal stent 11, a coveringfilm 12 coated on the surface of the multi-circle metal stent and a metalbare stent 13 connected with the top end of the multi-circle metal stent, and anannular diaphragm 14 is arranged on the periphery of the coveringfilm 12 at the proximal end of each stent unit.

Theannular membrane 14 is arranged at a position 0.5cm away from the upper edge of thecovering membrane 12, and the thickness of theannular membrane 14 is 2mm, and the width of the annular membrane is 2mm. The far end of the bracket unit is in a straight cylinder shape. The metalbare bracket 13 is provided with ananti-falling fixing structure 131; the coveringfilm 12 and theannular membrane 14 are made of high polymer material polytetrafluoroethylene with good biocompatibility; the multiple circles of metal stents are sequentially arranged along the axial direction of the covering film, and each circle of metal stent can elastically deform along the radial direction of the covering film; the multi-ring metal support is formed by processing alloy wires and consists of a plurality of closed cylindrical structures of waveform units.

Example 2

Referring to fig. 3 and 4, the covered stent comprises two stent units, each stent unit comprises amulti-circle metal stent 11, a coveringfilm 12 coated on the surface of the multi-circle metal stent and a metalbare stent 13 connected with the top end of the multi-circle metal stent, anannular membrane 14 is arranged on the periphery of the covering film at the near end of one stent unit, and twoannular membranes 14 are arranged on the periphery of the covering film at the near end of the other stent unit.

Theannular membrane 14 of the support unit provided with an annular membrane is arranged at a distance of 0.5cm from the upper edge of the covering membrane, the thickness of the annular membrane is 2mm, and the width of the annular membrane is 2mm. The annular diaphragm of the top of the support unit that is equipped with two annular diaphragms is located apart from the tectorial membrane upper edge 0.5cm department, and the interval of two annular diaphragms is 2mm, and the thickness of two annular diaphragms is 2mm, and the width is 2mm. The far end of the bracket unit is in a straight cylinder shape. The metalbare bracket 13 is provided with ananti-falling fixing structure 131; the coveringfilm 12 and theannular membrane 14 are made of high polymer material polyurethane with good biocompatibility; the multiple circles ofmetal stents 11 are sequentially arranged along the axial direction of the coveringfilm 12, and each circle of metal stent can elastically deform along the radial direction of the covering film; the multi-ring metal support is formed by processing alloy wires and consists of a plurality of closed cylindrical structures of waveform units.

Claims (7)

1. A stent graft, comprising: the stent consists of two stent units, wherein each stent unit consists of a multi-ring metal stent, a covering film coated on the surface of the multi-ring metal stent and a metal bare stent connected with the top end of the multi-ring metal stent, at least one annular membrane is arranged on the periphery of the covering film at the near end of each stent unit, the annular membrane is arranged at a position 0.5-2cm away from the upper edge of the covering film, and the far end of each stent unit is in a straight cylinder shape or a gradually expanded horn mouth shape; the number of the annular diaphragms of the two support units is different; the thickness of the annular membrane is 1mm-2mm, and the width is 1mm-3mm.

2. The stent graft as recited in claim 1, wherein: the annular membrane is arranged at a position 0.5cm-1.5cm away from the upper edge of the covering membrane.

3. The stent graft of claim 2, wherein: the thickness of annular diaphragm is 2mm, and the width is 2mm.

4. The stent-graft of claim 1, wherein: the number of the annular diaphragms is 1-3.

5. The stent-graft of claim 4, wherein: the number of the annular diaphragms is 2-3, and the distance between every two adjacent annular diaphragms is 1mm-3mm.

6. The stent graft as recited in claim 4, wherein: the distance between two adjacent annular diaphragms is 2mm.

7. The stent graft of any one of claims 1-6, wherein: the metal bare bracket is provided with an anti-falling fixing structure; the covering film and the annular membrane are made of high polymer materials with good biocompatibility; the multiple circles of metal stents are sequentially arranged along the axial direction of the covering film, and each circle of metal stent can elastically deform along the radial direction of the covering film; the multi-ring metal support is formed by processing alloy wires and consists of a plurality of closed cylindrical structures of waveform units.

Images