Self-expanding stent and stent delivery system for treatment of vascular disease

• US 20050049670A1
• Filed: 10/23/2003
• Published: 03/03/2005
• Est. Priority Date: 08/29/2003
• Status: Abandoned Application

• Current Assignee: Codman & Shurtleff Incorporated (Johnson & Johnson)
• Original Assignee: Codman & Shurtleff Incorporated (Johnson & Johnson)
• Inventors: Mitelberg, Vladimir, Jones, Donald K.
• Application Number:
  US10/691,846
• Publication Number:
  US 20050049670A1
• Time in Patent Office: Days
• US Class Current: 623/1.120
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/848 having means for fixation to the vessel wall, e.g. barbs
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/8486 provided on at least one of the ends
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/9155 Adjacent bands being connected to each other
• 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 2002/9665 with additional retaining means

Abstract

An integrated balloon catheter and self-expanding stent, and stent delivery system are provided for treating vascular diseases such as partially occluded blood vessels within the brain. The self-expanding stent is preferably mounted on an elongated core wire, is disposed within a delivery lumen of a balloon catheter and is held in a compressed state onto the elongated core wire by a pair of actuatable retaining rings. When the stent is properly positioned with a vessel, the actuatable retaining rings are activated to release the compressed stent to thereby permit the stent to expand within the vessel.

Claims

1. A self-expanding stent and stent delivery system comprising:

an elongated core member having proximal and distal portions including a proximal cylindrical member disposed at the distal portion of said elongated core member, and a distal cylindrical member disposed at the distal portion of said elongated core member and positioned distally of said proximal cylindrical member and being spaced apart from said proximal cylindrical member to define a gap having a predetermined length;

a self-expanding stent comprised of a small diameter skeletal tubular member having an outer cylindrical surface which defines a thin wall, said wall of said skeletal tubular member including a plurality of cells which are formed by a plurality of interconnected strut members, and an anchor member placed on one of said plurality of strut members and having a length less than the length of the gap between the proximal cylindrical member and the distal cylindrical member, and said self-expanding stent being mounted and compressed onto said elongated core member such that said anchor member is interlocked within said gap and between said proximal cylindrical member and said distal cylindrical member to thereby retain said stent on said elongated core member; and

,

an actuatable retaining ring is disposed around the outer cylindrical surface of said self-expanding stent for retaining said stent onto said elongated core member in a compressed state, for upon actuation, releasing said self-expanding stent to permit the stent to expand against the wall of a vessel.

2. A self-expanding stent and stent delivery system as defined in claim 1, wherein said self-expanding stent has proximal and distal portions, and said actuatable retaining ring is disposed around the proximal portion of said stent.

3. A self-expanding stent and stent delivery system as defined in claim 1, wherein said self-expanding stent has proximal and distal sections, and a first actuatable retaining ring is disposed around the distal portion of the stent and a second actuatable retaining ring is disposed around the proximal portion of the stent.

4. A self-expanding stent and stent delivery system as defined in claim 1, wherein said actuatable retaining ring is formed of a material which when heated permits the compressed self-expanded stent to expand into contact with the wall of a vessel.

5. A self-expanding stent and stent delivery system as defined in claim 4, including a heating element positioned in proximity to said actuatable retaining ring, and electrical conductors connected to said heating element for, upon being energized, causing the temperature of said heating element to increase thereby causing the temperature of the actuatable retaining ring to increase with the result that the actuatable retaining ring yields to permit the stent to expand against the wall of a vessel.

6. A self-expanding stent and stent delivery system as defined in claim 5, in which the actuatable retaining ring is comprised of a polymeric material.

7. A self-expanding stent and stent delivery system as defined in claim 5, in which the actuatable retaining ring takes the form of a polymeric filament.

8. A self-expanding stent and stent delivery system as defined in claim 5, in which the actuatable retaining ring is comprised of a filament formed from a hot melt polymer.

9. A self-expanding stent and stent delivery system as defined in claim 5, in which the heating element is an electrical resistive heating element.

10-20. -20 (cancelled).