Hoop stent

• US 5,830,229 A
• Filed: 03/07/1997
• Issued: 11/03/1998
• Est. Priority Date: 03/07/1997
• Status: Expired due to Fees

• Current Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Original Assignee: Micro Therapeutics, Inc. (Medtronic Plc)
• Inventors: Wallace, Sidney, Wright, Kenneth C., Konya, Andres
• Primary Examiner(s): Buiz, Michael Powell
• Assistant Examiner(s): TRUONG, KEVIN THAO
• Application Number:
  US08/813,614
• Time in Patent Office: 606 Days
• Field of Search: 606/108, 606/198, 606/191, 606/194, 606/192
• US Class Current: 606/198
• 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 2002/9511 the retaining means being filaments or wires

Abstract

A wire frame stent and stent delivery system for inserting the stent into the body.

Claims

1. A device comprising:

a stent comprising a plurality of hoops connected by struts;

said stent being mounted upon an insertion catheter tube having at least one lumen within the tube, said insertion catheter tube having at at least one retaining clip side aperture near a distal end of the stent and at least one retaining loop side aperture near a proximal end of the stent;

a retaining loop extending from the proximal end of the insertion catheter tube, through a lumen in the insertion catheter tube and out the retaining loop side aperture and engaging the stent to secure said stent to the insertion catheter tube;

a retaining clip extending from a lumen in the insertion catheter tube and out the retaining clip side aperture and engaging the stent to secure it to the insertion catheter tube;

said retaining clip being operably connected to a wire in the lumen of the insertion catheter tube, where said wire extends to the proximal end of the insertion catheter and is operable to withdraw the retaining clip from engagement with the stent;

said retaining loop being severable to release the stent from retention by the retaining loop.

2. The device of claim 1, wherein:

the stent is characterized by an unconstrained diameter and a longitudinally stretched diameter, and the stretched diameter is smaller than the unconstrained diameter, and

the stent is mounted on the insertion catheter tube in the stretched condition having the smaller stretched diameter and secured to the insertion catheter tube by the retaining loop and retaining clip; and

the stent may be released from the insertion catheter tube by withdrawing the retaining clip from engagement with the stent and severing the retaining loop to release the stent from retention by the retaining loop, whereupon the stent may expand to its unconstrained diameter.

3. The stent of claim 1, wherein the stent is comprised of a shape memory material.

4. The stent of claim 1, wherein the stent is comprised of a pseudoelastic material.

5. The stent of claim 1, wherein the stent is comprised of a shape memory nitinol.

6. The stent of claim 1, wherein the stent is comprised of a pseudoelastic nitinol.