CN111281600A

CN111281600A - TIPS stent

Info

Publication number: CN111281600A
Application number: CN202010124375.4A
Authority: CN
Inventors: 李臻琰; 陈为凯; 吴光亚; 许培林; 吴强; 黄伟; 周鸿书
Original assignee: Suzhou Tepxin Intelligent Technology Co ltd
Current assignee: Suzhou Tepxin Intelligent Technology Co ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-06-16

Abstract

The invention relates to a support for TIPS, which is characterized in that: comprises a film-covered framework, an elastic self-expanding framework and a noble metal ring; the film-covered framework is made by laser engraving, is a tubular structure capable of contracting along the radial direction and comprises a supporting bone and a film; the elastic self-expansion framework is formed by mutually matching metal wires and is of a conical pipe-shaped structure capable of contracting along the radial direction; the two elastic self-expansion frameworks are respectively positioned at two ends of the film-covered framework and are connected with the film-covered framework through noble metals; the elasticity faces outwards from the end with the large diameter of the expanded bone, and the end with the small diameter faces the film-covered framework. The bracket is manufactured by adopting a method of self-expanding of braided wires at the end part and carving at the middle part; the applied force required by the bracket during release is smaller, the risk of bracket displacement is smaller, the operation is more convenient, and the operation effect is better; meanwhile, the cost of the bracket is reduced by adopting a mode of combining weaving and carving, and the production process is simple and convenient.

Description

TIPS stent

Technical Field

The invention relates to the field of medical equipment, in particular to a support for TIPS.

Background

Currently, Transjugular Intrahepatic Portosystemic Shunt (TIPS) is an effective non-operative treatment method for hepatic cirrhosis portal hypertension and complications thereof, and is developed on the basis of liver biopsy and portal angiography examination by a jugular vein approach. Since the successive development and emergence of intraluminal stents of different configurations, after 1985, it was further confirmed by experimental TIPS: the stent has good function of keeping the shunt open, thereby really developing the application research of TIPS.

The current TIPS stent completely adopts a self-expanding stent; the stent is contracted and stored in a specific packaging cavity before use; the stent is placed at a specific position during operation, and the wrapping cavity is drawn backwards to release and prop out the stent; but because the stent with the front end exposed when the wrapping cavity is drawn out backwards begins to release self-expansion at the same time, the TIPS stent has a certain length; therefore, drawing out the envelope requires a considerable drawing force, which may cause displacement of the TIPS stent, thus affecting the quality of the operation; meanwhile, the process of adopting the self-expanding bracket has high difficulty and higher cost.

Disclosure of Invention

The invention overcomes the defects of the prior art and provides the support for TIPS, which is convenient to operate and low in cost.

In order to achieve the purpose, the invention adopts the technical scheme that: provided is a stent for TIPS, characterized in that: comprises a film-covered framework, an elastic self-expanding framework and a noble metal ring; the film-covered framework is made by laser engraving, is a tubular structure capable of contracting along the radial direction and comprises a supporting bone and a film; the elastic self-expansion framework is formed by mutually matching metal wires and is of a conical pipe-shaped structure capable of contracting along the radial direction; the two elastic self-expansion frameworks are respectively positioned at two ends of the film-covered framework and are connected with the film-covered framework through noble metals; the elasticity faces outwards from the end with the large diameter of the expanded bone, and the end with the small diameter faces the film-covered framework.

Preferably, the supporting bone has a ring structure, and a plurality of supporting bones are arranged in series and connected by a covering film.

As a more preferable mode, the coating film includes an outer coating film and an inner coating film; the inner covering film surrounds the whole covering film framework from the inside, and the outer covering film surrounds each supporting bone from the outside for one circle.

More preferably, the supporting bone is a loop of wire having a repeating unit in the shape of a "V".

More preferably, the outer coating is provided in the middle of the side surface of the supporting bone fold line ring structure.

Preferably, the inner diameter of the noble metal ring, the inner diameter of the end with the smaller diameter of the elastic self-expansion framework and the inner diameter of the film-coated framework are the same.

Preferably, the material of the noble metal ring is gold.

More preferably, the supporting bone and the metal wire are made of nickel-titanium alloy.

As a more preferable scheme, the material of the inner coating and the outer coating is one of medical silicon rubber, medical polyurethane or expanded polytetrafluoroethylene.

The beneficial technical effects of the invention are mainly as follows: provides a TIPS stent with convenient operation and low cost.

(1) The bracket is manufactured by adopting a method of self-expanding of braided wires at the end part and carving at the middle part; the applied force required by the bracket during release is smaller, the risk of bracket displacement is smaller, the operation is more convenient, and the operation effect is better; meanwhile, the cost of the bracket is reduced by adopting a mode of combining weaving and carving, and the production process is simple and convenient.

(2) The bracket is provided with an outer covering film in the middle of the side surface of each supporting fracture wire ring; the arrangement is used for shaping the support bone, improving the stability of the released stent, ensuring the smooth surface of the inner coating without folds and reducing the formation of embolism; meanwhile, compared with the conventional arrangement, the arrangement can reduce the cost and make the size of the bracket smaller.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.

In the figure: 1 is a coating framework, 11 is a supporting framework, 12 is an inner coating, 13 is an outer coating, 14 is a connecting framework, 2 is an elastic self-expanding framework, 21 is a metal wire, and 3 is a noble metal ring.

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings and examples, which are simplified schematic drawings and illustrate only the basic structure of the invention in a schematic manner, and thus show only the constituents relevant to the invention. It should be noted that the terms "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

As shown in FIG. 1, the TIPS stent includes a stent graft skeleton 1, an elastic self-expanding skeleton 2, and a noble metal ring 3.

The film-coated framework 1 is manufactured by coating a film after a nickel-titanium alloy tube is engraved by laser; the tectorial membrane skeleton 1 is a straight tube structure which can be contracted along the radial direction, and is formed by connecting an inner tectorial membrane 12, an outer tectorial membrane 13 and a connecting bone 14 after a plurality of supporting bones 11 are arranged in sequence from front to back (according to the direction of the stent in the human body, the same below).

Wherein, all the supporting bones 11 are broken line rings (wave-shaped or other conventional structures can also be adopted) which are formed by taking the 'V' -shape as a repeating unit and connecting the top ends of the two sides of the 'V' -shape of a plurality of repeating units in sequence; the connecting bones 14 are sequentially connected with the supporting bones 11 along the axial direction of the film-coated framework 1; the inner coating 12 surrounds the whole of the laminated skeleton 1 from the inside, and the outer coating 13 surrounds the middle of the side of the broken line ring structure of each supporting bone 11 from the outside; the arrangement mode of the outer coating film 13 is to shape the support bone 11, improve the stability of the released stent, ensure the smooth surface of the inner coating film 12 without folds and reduce the formation of embolism; meanwhile, compared with the conventional arrangement, the arrangement can reduce the cost and make the size of the bracket smaller. The supporting bone 11 and the connecting bone 14 are formed by laser engraving and are made of nickel-titanium alloy; the inner covering film 12 and the outer covering film 13 are made of one of medical silicon rubber, medical polyurethane or expanded polytetrafluoroethylene; the covered skeleton 1 can be inflated by balloon expansion when in use.

The elastic self-expansion framework 2 is a conical tube-shaped structure which can be contracted to be cylindrical along the radial direction, is made by mutually weaving and fixing a plurality of metal wires 21 made of nickel-titanium alloy into a network, and has the characteristic of automatic expansion; the structure of the elastic self-swelling framework 2 is similar to that of an umbrella-shaped venous filter; two elastic self-expansion frameworks 2 are arranged and coaxially arranged at two ends of the film-covered framework 1 through noble metal rings 3 respectively; the elastic self-expanding framework 2 has a large diameter and a small diameter, and the large diameter end faces the film-covered framework 1; the inner diameter of the noble metal ring 3, the inner diameter of the end with the smaller diameter of the elastic self-expansion framework 2 and the inner diameter of the film-covered framework 1 are the same; the end with small diameter of the elastic self-expansion framework 2 and the two end parts of the film-covered framework 1 are respectively connected with the noble metal ring 3 in a welding or clamping way.

The noble metal ring 3 is made of gold, has developing capability and mainly plays a role in indicating positions.

At the time of surgery: firstly, the TIPS stent is placed at a preset position, the noble metal ring 3 carries out development indication to ensure that the elastic self-expanding framework 2 completely extends into a blood vessel, and the coated framework 1 does not extend into the blood vessel, so that thrombus formed by the coated framework 1 entering the blood vessel is avoided, and massive hemorrhage caused by the fact that the elastic self-expanding framework 2 is left in liver tissues is avoided; then the elastic self-expanding framework 2 is ejected and coated in a pushing injection mode to be expanded in the blood vessel for supporting, and then the coated framework 1 is expanded in a balloon expansion mode, so that a channel between two blood vessels is established; because only the elastic self-expansion framework 2 is self-expanded, the elastic self-expansion framework can be ejected and released in a push injection mode, the force to be applied by the whole framework is smaller, and the risk of the displacement of the support is smaller, so that the support is more convenient for operation and has better operation effect; in addition, the elastic self-expanding framework 2 has a larger hollow part after being expanded, thereby ensuring that the elastic self-expanding framework 2 can not block the blood flow in the blood vessel after being released.

In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

A stent for TIPS, characterized in that: comprises a film-covered framework, an elastic self-expanding framework and a noble metal ring; the film-covered framework is made by laser engraving, is a tubular structure capable of contracting along the radial direction and comprises a supporting bone and a film; the elastic self-expansion framework is formed by mutually matching metal wires and is of a conical pipe-shaped structure capable of contracting along the radial direction; the two elastic self-expansion frameworks are respectively positioned at two ends of the film-covered framework and are connected with the film-covered framework through noble metals; the elasticity faces outwards from the end with the large diameter of the expanded bone, and the end with the small diameter faces the film-covered framework.
2. A stent for TIPS according to claim 1, wherein: the supporting bones are of an annular structure, and the supporting bones are sequentially arranged in front and back and are connected by the covering film.
3. A stent for TIPS according to claim 2, wherein: the covering film comprises an outer covering film and an inner covering film; the inner covering film surrounds the whole covering film framework from the inside, and the outer covering film surrounds each supporting bone from the outside for one circle.
4. A stent for TIPS according to claim 3, wherein: the supporting bone is a folding line ring taking a V shape as a repeating unit.
5. A stent for TIPS according to claim 4, wherein: the outer coating film is arranged in the middle of the side face of the supporting bone broken line ring structure.
6. A support for TIPS according to any one of claims 1 to 5, wherein: the inner diameter of the noble metal ring, the inner diameter of the end with small diameter of the elastic self-expansion framework and the inner diameter of the tectorial membrane framework are the same.
7. A support for TIPS according to any one of claims 1 to 5, wherein: the material of the noble metal ring is gold.
8. A stent for TIPS according to claim 7, wherein: the supporting bone and the metal wire are made of nickel-titanium alloy.
9. A stent for TIPS according to claim 8, wherein: the inner covering film and the outer covering film are made of one of medical silicon rubber, medical polyurethane or expanded polytetrafluoroethylene.