Methods for applying an elastic coating layer on stents

• US 5,534,287 A
• Filed: 11/29/1994
• Issued: 07/09/1996
• Est. Priority Date: 04/23/1993
• Status: Expired due to Term

• Current Assignee: Boston Scientific Corporation
• Original Assignee: Schneider (Europe) GmbH (Boston Scientific Corporation)
• Inventors: Lukic, Goran
• Primary Examiner(s): DUDASH, DIANA L
• Application Number:
  US08/346,066
• Time in Patent Office: 588 Days
• Field of Search: 427/2.25, 427/2.28, 427/178, 427/2.24, 427/177, 427/11, 156/294, 156/303.1
• US Class Current: 427/2.25
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/072 Encapsulated stents, e.g. wire or whole stent embedded in lining
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable

Abstract

The coated stent comprises a cylindrical wall formed by meshed wires and a covering layer of elastic material extending on a portion of its length, with an outer surface, and totally embracing the wire mesh.

Method of coating the stent using a lifting medium and then an elastomeric composition dissolved in solvent are disclosed.

Claims

1. A method for applying a covering layer to a stent comprising:

(a) radially contracting the stent;

(b) coating the inner surface of a tube with a lifting medium;

(c) inserting at least a portion of the contracted stent into the tube;

(d) radially expanding at least the portion of the stent in the tube or allowing at least the portion of the stent to radially expand in the tube;

(e) preparing an elastomeric composition dissolved in a solvent;

(f) coating the tube and stent with the elastomeric polymerisable composition dissolved in the solvent;

(g) evaporating the solvent;

(h) polymerizing the elastomeric composition and forming at least a portion of a layer on the stent in the tube; and

(i) removing the stent from the tube.

2. A method for applying a covering layer to a stent comprising:

(a) coating a surface with a lifting medium;

(b) preparing an elastomeric polymerisable composition dissolved in a solvent;

(c) coating the surface with the elastomeric polymerisable composition dissolved in the solvent;

(d) rolling at least a portion of the stent, in an expanded condition, on the surface;

(e) removing the stent from the surface;

(f) evaporating the solvent from the stent; and

(g) polymerizing the elastomeric polymerisable composition on at least the portion of the stent.

3. A method for coating a stent comprising:

(a) inserting a radially contracted stent into a tube, the tube having an inner surface and the stent having an inner and outer surface;

(b) radially expanding the stent or allowing the stent to radially expand in the tube so that at least part of the stent outer surface makes contact with at least part of the tube inner surface;

(c) coating at least part of the inner and/or the outer surface of the stent with an elastomeric polymerisable composition dissolved in a solvent;

(d) evaporating the solvent;

(e) polymerizing the elastomeric composition; and

(f) removing the coated stent from the tube.

4. A method for coating a stent comprising:

(a) coating a surface with a lifting medium;

(b) coating the surface with an elastomeric polymerisable composition dissolved in a solvent;

(c) rolling at least a portion of an expanded stent on the surface to coat at least part of the stent with the elastomeric polymerisable composition comprising a solvent;

(d) removing the stent from the surface;

(e) evaporating the solvent; and

(f) polymerizing the elastomeric composition.

5. A method for applying a covering layer to a stent comprising:

(a) coating the inner surface of a tube with a lifting medium;

(b) coating the tube with an elastomeric composition dissolved in a solvent and then evaporating the solvent;

(c) radially contracting a stent;

(d) inserting at least a portion of the contracted stent into the tube;

(e) radially expanding at least the portion of the stent in the tube or allowing at least the portion of the stent to radially expand in the tube;

(f) coating the tube and stent with an elastomeric composition dissolved in a solvent, which may be the same as or different than the elastomeric composition and solvent of step (b), and then evaporating the solvent;

(g) polymerizing the elastomeric composition and forming at least a portion of a layer on the stent in the tube; and

(h) removing the stent from the tube.