Temporary stent

• US 5,961,547 A
• Filed: 10/14/1997
• Issued: 10/05/1999
• Est. Priority Date: 06/22/1995
• Status: Expired due to Fees

• Current Assignee: Ali Razavi
• Original Assignee: Ali Razavi
• Inventors: Razavi, Ali
• Primary Examiner(s): Milano, Michael J.
• Application Number:
  US08/950,521
• Time in Patent Office: 721 Days
• Field of Search: 623/1, 623/12
• US Class Current: 623/1.22
• CPC Class Codes: A61F 2/0077 Special surfaces of prostheses, e.g. for improving ingrowth A61F2/30767 takes precedence
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2210/0033 electrically, e.g. heated by resistor
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61L 31/02 Inorganic materials
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 31/048 obtained by reactions only involving carbon-to-carbon unsaturated bonds A61L31/041 takes precedence
• CPC Class Codes: A61L 31/06 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds A61L31/041 takes precedence
• CPC Class Codes: A61L 31/10 Macromolecular materials

Abstract

This invention concerns an improved removable stent for temporary placement within a body. A stent according to the present invention utilizes a removable coil or the like of reinforcing filament such as metal or plastic wire enclosed at least partially within a shell or within a covering of biodegradable/bioabsorbable material which is allowed to remain within the body after removal of the reinforcing filament.

Claims

1. A removable stent comprising in combination:

a first body of biomaterial for lining a body passageway and having proximal and distal end portions and an exterior surface constructed and arranged for contacting the interior wall of the passageway when inserted therein;

at least one elongate removable core body with proximal and distal ends, the core body being conductive and positioned with respect to the first body so as to reinforce it;

means attached to the proximal end of the core body for removal of the core body from the first body; and

an intermediate second body of biomaterial positioned between the first body and the core body, the intermediate second body having the property of changing from a solid condition to a release condition upon application of a stimulus thereto, whereby the core body can be removed while the stent is within the body passageway.

2. The stent of claim 1 in the configuration of a coil, the biomaterials enclosing the core body over its length.

3. The stent of claim 1 in the configuration of a coil, the biomaterials only partially enclosing the core body over its length.

4. The stent of claim 1 in the configuration of a coil.

5. The stent of claim 4 in which the biomaterials at least partially enclose the core body over its length.

6. The stent of claim 4 including at the distal end a fusible link in the core body, the core body being conductive so as to soften the link when desired.

7. The stent of claim 1 in which the first body is in the form of a tube for lining a body passageway, the second body being included as a lining of the tube and positioned between the first body and the core body, the intermediate second body having the property of changing from a solid condition to a release condition upon application of a stimulus thereto, whereby the core body can be removed while the stent is within the body passageway.

8. The stent of claim 7 in which the core body comprises a double coil.

9. The stent of claim 1 in which a balloon including means for inflating/deflating same is included which extends over the length of the core body enclosing same.

10. The stent of claim 1 wherein the core body and the intermediate second body are engulfed in the first body of biomaterial.

11. The stent of claim 10 wherein the first body of material is a cylindrical sleeve.

12. The stent of claim 1 wherein the first body comprises a plurality of layers of biomaterial situated between the body of the stent and the interior wall of the passageway when inserted therein, the layers aiding in the facilitation of the stent'"'"'s removal from the passageway while preventing disruption of the healing process of the walls of the passageway and supplying additional support.

13. A removable stent comprising in combination:

a first body of biomaterial in the form of a cylindrical sleeve for lining a body passageway and having proximal and distal end portions and an exterior surface constructed and arranged for contacting the interior wall of the passageway when inserted therein;

at least one elongate removable core body of similar predetermined configuration and with proximal and distal ends, the core body being positioned with respect to the first body so as to reinforce it;

means attached to the proximal end of the core body for the removal of the core body from the first body, which may be achieved by pulling on the means; and

an intermediate second body of biomaterial positioned between the first body and the core body, the intermediate second body having the property of changing from a solid condition to a release condition upon application of a stimulus thereto, whereby the core body can be removed while the stent is within the body passageway,

wherein the core body and the intermediate second body are engulfed in the first body of biomaterial and wherein the core body and the intermediate body are in the configuration of a coil.

14. The stent of claim 13 wherein the biomaterials at least partially enclose the core body over its length.

15. The stent of claim 13 including at the distal end a fusible link in the core body, the core body being conductive so as to soften the link when desired.