Selectively expandable and releasable stent

• US 7,175,653 B2
• Filed: 05/03/2001
• Issued: 02/13/2007
• Est. Priority Date: 05/17/2000
• Status: Expired due to Fees

• Current Assignee: Xtent Medical Incorporated
• Original Assignee: Xtent Medical Incorporated
• Inventors: Gaber, Benny
• Primary Examiner(s): THALER, MICHAEL H
• Application Number:
  US10/276,275
• Publication Number:
  US 20030208262A1
• Time in Patent Office: 2,112 Days
• Field of Search: 623/1.11, 623/1.12, 623/1.15, 606/198
• US Class Current: 623/1.15
• CPC Class Codes: A61F 2/92 Stents in the form of a rolled-up sheet expanding after insertion into the vessel , e.g. with a spiral shape in cross-section
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2250/0007 for adjusting length
• CPC Class Codes: A61F 2250/001 for adjusting a diameter

Abstract

A stent including a plurality of loops, each of the loops includes an arcuately formed wire with a first end and a second end, the first end being attached to an inner elongate member and the second end being attached to an outer elongate member, the inner and the outer elongate members being arranged to slide with respect to each other along a common longitudinal axis, wherein sliding of the inner and the outer elongate members with respect to each other changes a cross-sectional area of each of the loops, characterized in that the inner and outer elongate members are attached to inner and outer coupler tubes, and are selectively releasable from the inner and outer coupler tubes, the inner coupler tube being nested inside the outer coupler tube.

Claims

1. A stent comprising:

a selectably and variably expandable stent assembly including;

first and second mutually axially displaceable elongate elements, each having first and second elongate edges and a plurality of loops each joined at an end thereof to an edge of said first elongate element and at an opposite end thereof to an edge of said second elongate element,

said plurality of loops including at least one pair of mutually crossing loops including;

a first loop joined at a right end thereof directly to a first edge of of said first elongate element and at a left end thereof directly to a second edge of said second elongate element; and

a second loop joined at a right end thereof directly to a first edge of said second elongate element and at a left end thereof directly to a second edge of said first elongate element.

2. A stent according to claim 1 and wherein:

each of said plurality of loops comprises an arcuately formed wire with a first end and a second end, said first end being attached to said first elongate element and said second end being attached to said second elongate element, said first and said second elongate elements being arranged to slide with respect to each other along a common longitudinal axis, wherein sliding of said first and said second elongate elements with respect to each other changes a cross-sectional area of each of said plurality of loops; and

said stent also comprising a stent cross-section controller including first and second at least partially mutually nested displacing elements which are removably attachable to said first and second mutually axially displaceable elongate elements for selectable mutual displacement thereof, said cross-section controller comprising inner and outer coupler tubes, said inner coupler tube being nested inside said outer coupler tube.

3. The stent according to claim 2 wherein said inner coupler tube is formed with a bendable tab which is inserted through an aperture formed in said first elongate element.

4. The stent according to claim 2 wherein said outer coupler tube is formed with a bendable tab which is inserted through an aperture formed in said first elongate element.

5. The stent according to claim 2 wherein said outer coupler tube is formed with a tongue which is inserted through an aperture formed in said second elongate element.

6. The stent according to claim 5 wherein said outer coupler tube comprises an expandable, resilient portion from which extends said tongue.

7. The stent according to claim 6 wherein said outer coupler tube is nested in a flexible manipulator tube.

8. The stent according to claim 7 wherein said tongue passes through a pair of apertures formed in said manipulator tube.

9. The stent according to claim 7 wherein pulling said inner coupler tube generally proximally pulls said tab of said inner coupler tube out of said aperture, thereby releasing said inner coupler tube from said first elongate element.

10. The stent according to claim 9 wherein pushing said manipulator tube generally distally pushes said outer coupler tube generally distally, and pushes said tab of said outer coupler tube out of said aperture, thereby releasing said outer coupler tube from said first elongate element.

11. The stent according to claim 10 wherein pulling said inner and outer coupler tubes generally proximally releases said tongue from said aperture of said second elongate element, thereby allowing proximally-directed removal of said inner and outer coupler tubes and said manipulator tube.

12. The stent according to claim 2 wherein said inner and outer coupler tubes are constructed of a flexible plastic material.

13. The stent according to claim 12 wherein said flexible plastic material includes embedded reinforced wires.

14. The stent according to claim 2 wherein said inner and outer coupler tubes are constructed of a flexible metal.

15. The stent according to claim 2 wherein said inner and outer coupler tubes are constructed with multiple openings formed on circumferences thereof.

16. The stent according to claim 2 and further comprising a guide wire over which said stent is slid.

17. The stent according to claim 2 and further comprising a guide wire to which said stent is attached.

18. The stent according to claim 2 wherein said loops cross over each other in a braided arrangement.