Methods for regulating the flow of blood through the blood system

• US 6,979,350 B2
• Filed: 07/15/2003
• Issued: 12/27/2005
• Est. Priority Date: 12/18/1996
• Status: Expired due to Fees

• Current Assignee: 3F Therapeutics Incorporated (Medtronic Plc)
• Original Assignee: 3F Therapeutics Incorporated (Medtronic Plc)
• Inventors: Kalmann, Menno, Moll, Franciscus Laurens
• Primary Examiner(s): Willse, David H.
• Assistant Examiner(s): Blanco, Javier G.
• Application Number:
  US10/619,725
• Publication Number:
  US 20040015230A1
• Time in Patent Office: 896 Days
• Field of Search: 623/1.24, 623/1.26, 623 212- 219, 623/23.68, 623/23.7, 623/900
• US Class Current: 623/1.24
• CPC Class Codes: A61F 2/06 Blood vessels
• CPC Class Codes: A61F 2/2412 with soft flexible valve members, e.g. tissue valves shaped like natural valves check valves with flexible valve members in general F16K15/14
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/2475 Venous valves
• CPC Class Codes: A61F 2210/0019 operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation
• CPC Class Codes: Y10S 623/90 Stent for heart valve

Abstract

A valve prosthesis is disclosed which is implantable within a vein or other blood vessel of a patient using a minimally-invasive surgical procedure. The prosthesis includes a tubular wire frame which presses radially outward against the inner walls of the blood vessel following implantation to hold the prosthesis in position. Multiple flow-resistive pockets that open and close in response to changes in blood flow direction are attached to the frame to impede the flow of blood in the reverse direction. The prosthesis is implanted using an introducer catheter which holds the prosthesis in a radially-compressed state as the prosthesis is inserted into and positioned within the blood vessel.

Claims

1. A minimally invasive method of implanting a valve prosthesis device comprising a plurality of flexible, conical blood flow stoppage elements, each having a memory metal frame within an existing vein of a human to restore venous valvular function within the vein, the plurality of flexible, conical blood flow stoppage elements, each having a memory metal frame adapted to press outward against the inner walls of the vein to hold the plurality of flexible, conical blood flow stoppage elements, each having a memory metal frame in position within the vein following implantation, the method comprising the steps of:

collapsing the flexible, conical blood flow stoppage elements;

overlapping flareable proximal ends of the flexible, conical blood flow stoppage elements;

positioning the collapsed plurality of flexible, conical blood flow stoppage elements, each having a memory metal frame within a hollow distal portion of an introducer with the plurality of flexible, conical blood flow stoppage elements, each having a memory metal frame in a compressed state;

advancing the hollow distal portion of the introducer, with the plurality of flexible, conical blood flow stoppage elements, each having a memory metal frame positioned therein, into the vein of the human through an opening in a wall of the vein;

expelling the plurality of flexible, conical blood flow stoppage elements, each having a memory metal frame from the hollow distal portion of the introducer into the vein; and

temperature expanding the plurality of flexible, conical blood flow stoppage element frames, and thereby expanding the flareable proximal ends of the blow flow stoppage elements such that they no longer overlap as so to expand to an operational state in which the plurality of flexible, conical blood flow stoppage elements, each having a memory metal frame are maintained in position within the vein by pressing outward against the inner walls of the vein.

2. The method of claim 1, wherein the step of expelling comprises slidably advancing an expulsion member distally within the introducer to forcibly displace the plurality of flexible, conical blood flow stoppage elements, each having a memory metal frame from the hollow distal portion of the introducer.

3. The method of claim 1, wherein the plurality of flexible, conical blood flow stoppage elements and memory metal frames is rollable upon itself to place the frames in a tubular configuration, and wherein the step of positioning comprises rolling the frames against a biasing force to place the plurality of flexible, conical blood flow stoppage elements and memory metal frames in a radially-compressed configuration that corresponds to an inner diameter of the hollow distal portion of the introducer.