Untwisting restraint implant delivery system

• US 8,579,954 B2
• Filed: 01/27/2006
• Issued: 11/12/2013
• Est. Priority Date: 11/02/2005
• Status: Active Grant

• Current Assignee: Biosensors International Group, Ltd.
• Original Assignee: Biosensors International Group, Ltd.
• Inventors: Licata, David
• Primary Examiner(s): Dornbusch, Dianne
• Application Number:
  US11/342,316
• Publication Number:
  US 20070100417A1
• Time in Patent Office: 2,846 Days
• Field of Search: 623/1.11, 623/1.12, 623/1.23, 606/108, 606/191, 606/194
• US Class Current: 623/1.11
• 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 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• CPC Class Codes: A61F 2002/9505 having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2250/0071 breakable or frangible

Abstract

Medical devices and methods for delivery or implantation of prostheses within hollow body organs and vessels or other luminal anatomy are disclosed. The subject technologies may be used in the treatment of atherosclerosis in stenting procedures or be used in variety of other procedures. The systems may employ a self expanding stent restrained by one or more members released by an electrolytically erodable latch. Such release means do not connect directly to the implant, though one or more portions may contact it.

Claims

1. A method of maintaining a self-expanding stent on a delivery guide, the method comprising:

twisting a stent, which comprises a lattice of closed cells, to a reduced profile, wherein the stent comprises a plurality of near end projections and a plurality of far end projections, wherein the stent is releaseably secured to a delivery guide through said projections, and wherein twisting the stent comprises rotating the near end projections or the far end projections relative to other; and

holding the stent twisted by maintaining at least one rotatable seat in a fixed position, wherein the at least one rotatable seat is secured to the delivery guide and coupled to the near end projections or the far end projections the stent.

2. The method of claim 1, wherein maintaining the at least one rotatable seat in a fixed position comprises maintaining the at least one rotatable seat in a fixed rotational position relative to the delivery guide.

3. The method of claim 2, wherein maintaining the at least one rotatable seat in a fixed position comprises maintaining the at least one rotatable seat in a fixed position with a member having an electrolytically erodable sacrificial section.

4. The method of claim 3, wherein the far end projections are coupled to said at least one rotatable seat and said near end projections are releasably secured to another seat coupled to the delivery guide and a second member is wrapped around the another seat and at least a portion of the near mating portion.

5. The method of claim 1, wherein the delivery guide has a crossing profile in the range of about 1 French to about 2 French.

6. The method of claim 1, wherein allowing the stent to untwist and expand causes the length of the stent to shorten.

7. The method of claim 1, wherein the delivery guide is a guidewire.

8. The method of claim 1, wherein each closed cell comprises a plurality of struts including a first pair of axially adjacent and interconnected struts and a second pair of axially adjacent and interconnected struts, one strut of the first pair being connected to the one strut of the second pair through a strut junction.

9. The method of claim 1, wherein each closed cell consists of four interconnected struts.