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Variable stiffness balloon catheter

  • US 5,437,632 A
  • Filed: 06/02/1993
  • Issued: 08/01/1995
  • Est. Priority Date: 06/02/1993
  • Status: Expired due to Fees
First Claim
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1. A single lumen valved balloon catheter for use in combination with a guidewire, said catheter comprising an elongate tubular body having a proximal end and a distal end and a lumen extending between said ends for receiving the guidewire, said body comprising:

  • (a) an inflatable balloon segment intermediate said ends, proximate said distal end;

    (b) an outer coaxial tube extending continuously between the proximal end and the balloon having a wall thickness of between about 0.05 to 0.13 mm and being made of a polymer having flexural modulus of about 5,000 to 30,000 psi (35,000 to 210,000 kpa); and

    (c) proximal and distal inner coaxial polymeric tube sections positioned contiguously in tandem proximal to the inflatable balloon segment and located within a portion of the outer coaxial tube;

    wherein the distal end of the inner coaxial tube is proximal said balloon, the proximal inner coaxial tube section having a wall thickness of about 0.08 to 0.18 mm and being made of a polymer having a flexural modulus of about 220,000 to 260,000 psi (1,500,000 to 1,800,000 kpa), and the distal inner coaxial tube section being less stiff than the proximal inner coaxial tube section but stiffer than the portion of the outer coaxial tube extending from the distal inner coaxial tube section to the balloon.

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