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Medical material removal method and associated instrumentation

  • US 5,928,218 A
  • Filed: 05/24/1996
  • Issued: 07/27/1999
  • Est. Priority Date: 12/16/1994
  • Status: Expired due to Term
First Claim
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1. A minimally invasive medical method, comprising:

  • providing a catheter, a tubular member and a drive rod, said catheter having a distal end section and a suction port, said tubular member having a distal end portion provided with an intake port and further having a outlet port, said drive rod being disposed in said tubular member and having a distal end provided with a cutter element having a cutting edge;

    inserting said distal end section of said catheter into a patient;

    inserting said tubular member into said catheter so that said intake port is disposed outside said catheter and said outlet port is disposed inside said catheter;

    shifting said drive rod in said tubular member so that said cutter element moves to open said intake port;

    applying suction to said catheter to pull material from the patient through said intake port into said distal end portion of said tubular member;

    shifting said drive rod to move said cutting edge of said cutter element past said intake port to thereby sever the material pulled into said distal end portion of said tubular member;

    by an application of suction force, drawing the severed material in a proximal direction from said distal end portion of said tubular member, through said outlet port and along said catheter, outside of said proximal portion of said tubular member, to said suction port of said catheter; and

    during the drawing of the severed material, feeding fluid into said tubular member upstream of said severed material to facilitate the drawing of the severed material.

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