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Dimension sensitive angioplasty catheter

  • US 4,587,975 A
  • Filed: 07/02/1984
  • Issued: 05/13/1986
  • Est. Priority Date: 07/02/1984
  • Status: Expired due to Term
First Claim
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1. Angioplasty catheter having means for indicating blood vessel wall dimensions comprising, in combination:

  • (a) an elongated tubular body having a longitudinally extending lumen and a proximal end and a distal end with an expander member affixed near said distal end, said expander member being in fluid communication with said lumen of said tubular body;

    (b) a plurality of electrodes disposed on the surface of said tubular body proximate said expander member;

    (c) signal generator means connected to the proximal end of said catheter body for applying an alternating current carrier signal between first and second of said plurality of electrodes, said carrier signal being modulated by the changes in blood flow through said blood vessel; and

    (d) signal processing means connected to third and fourth of said plurality of electrodes for developing a direct current signal proportional to the cross-sectional size of a blood vessel in which said distal end of said catheter body is disposed.

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