Stent and catheter assembly and method for treating bifurcations

• US 6,361,544 B1
• Filed: 12/01/1999
• Issued: 03/26/2002
• Est. Priority Date: 08/13/1997
• Status: Expired due to Term

• Current Assignee: Advanced Cardiovascular Systems Incorporated (Abbott Laboratories)
• Original Assignee: Advanced Cardiovascular Systems Incorporated (Abbott Laboratories)
• Inventors: Wilson, W. Stan, Mauch, Kevin M., Bigus, Steve
• Primary Examiner(s): TRUONG, KEVIN THAO
• Application Number:
  US09/452,514
• Time in Patent Office: 846 Days
• Field of Search: 606/194, 606/192, 606/191, 606/195, 606/198, 604/96.1, 604/101.01, 604/101.02, 604/101.03, 604/103
• US Class Current: 606/194
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• CPC Class Codes: A61F 2/90 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 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/067 modular
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61F 2002/91508 the meander having a difference in amplitude along the band
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2250/0014 having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
• CPC Class Codes: A61F 2250/006 modular

Abstract

An apparatus and method is provided for stenting bifurcated vessels. A proximal angled stent is configured for implanting in a side-branch vessel wherein the proximal angled stent has an angulated portion that corresponds to the angle formed by the intersection of the side-branch vessel and the main vessel so that all portions of the side-branch vessel at the bifurcation are covered by the proximal angled stent. A main-vessel stent is provided for implanting in the main vessel, wherein the main-vessel stent has an aperture or stent cell that aligns with the opening to the side-branch vessel to permit unobstructed blood flow between the main vessel and the side-branch vessel. Side-branch and main-vessel catheter assemblies are advanced over a pair of guide wires for delivering, appropriately orienting, and implanting the proximal angled stent and the apertured stent. In one embodiment, a stent delivery assembly is provided for implanting a Y-shaped stent in a bifurcated vessel. A dual balloon Y-shaped catheter is provided having two expandable members. The catheter is delivered over a guide wire while a restraining member holds the expandable members together for low profile delivery.

Claims

1. A stent delivery assembly for implanting a stent in a bifurcated vessel having a side-branch vessel and a main vessel, comprising:

a dual balloon Y-shaped catheter having a proximal end and a distal end, the catheter including a single catheter shaft joining a pair of relatively short catheter shaft portions, a first expandable member having a proximal end and a distal end and a second expandable member having a proximal end and a distal end;

a first lumen for receiving a restraining member, the first lumen extending through at least a portion of the catheter including the first expandable member;

a second lumen for receiving a guide wire, the second lumen extending through at least a portion of the catheter including the second expandable member; and

a restraining member positioned within the first lumen;

wherein the first expandable member and the second expandable member are normally biased apart, but are restrained and held together by the restraining member to provide a low profile during delivery of the stent.

2. The stent delivery assembly of claim 1, wherein the restraining member is a mandrel.

3. The stent delivery assembly of claim 1, wherein the restraining member is a guide wire.

4. The stent delivery assembly of claim 1, wherein a stent is removably mounted on the first and second expandable members.

5. The stent delivery assembly of claim 1, further including a removable locking ring for assisting in holding the distal ends of the first expandable member and the second expandable member together prior to implantation of the stent.

6. The stent delivery assembly of claim 1, wherein the first lumen includes a distal section, a portion of which extends through at least a portion of the second expandable member.

7. The stent delivery assembly of claim 6, wherein the restraining member extends through the first lumen found on the first expandable member and a portion of the lumen on the second expandable member to hold the first and second expandable members together until the assembly is to be deployed.