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Expandable pullback atherectomy catheter system

  • US 4,886,061 A
  • Filed: 02/09/1988
  • Issued: 12/12/1989
  • Est. Priority Date: 02/09/1988
  • Status: Expired due to Term
First Claim
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1. An apparatus for deployment within a vessel of a living body for removing obstructing tissue on the inner wall of said vessel, the apparatus comprising:

  • catheter means having a distal portion with a first more proximal region for cutting said obstructing tissue, and a second most distal region for collecting said obstructing tissue after it has been cut from the vessel wall, and said distal portion being capable of assuming a first and a second diameter, said second diameter being larger than said first diameter;

    cutting means located at said first more proximal region of said distal portion of the catheter means for cutting said obstructing tissue as the catheter means is pulled back in a retrograde direction through said obstruction tissue;

    tissue collecting means having a proximal and a distal end located at said second most distal region of said distal portion of the catheter means for collecting said obstructing tissue as it is cut from the vessel wall;

    deployment means for selectively causing said distal portion to assume said first or second diameter; and

    centering means on aid distal portion of the catheter means for engaging the inner wall of the vessel when said distal portion assumes said second diameter and for preventing the cutting means from contacting and cutting the inner wall of said vessel.

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