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Catheter with spiral cut transition member

  • US 8,206,372 B2
  • Filed: 06/03/2010
  • Issued: 06/26/2012
  • Est. Priority Date: 10/15/1997
  • Status: Expired due to Fees
First Claim
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1. A catheter, comprising:

  • an outer shaft having a proximal outer section having a distal end, a midshaft section having a distal end and having a proximal end attached to the distal end of the proximal outer section, and a distal outer section having a proximal end attached to the distal end of the midshaft section;

    wherein the proximal outer section has a first stiffness;

    wherein the midshaft section has a second stiffness that is less than the first stiffness;

    wherein the distal outer section has a third stiffness that is less than the second stiffness;

    an insert disposed within the outer shaft and extending from a first position adjacent to the distal end of the midshaft section to a second position adjacent to the proximal end of the distal outer section, the insert being configured to provide a smooth transition in flexibility between the midshaft section and the distal outer section;

    an inner shaft disposed within the outer shaft, the inner shaft having a distal tip attached thereto at a joint;

    a spiral cut transition member disposed about the inner shaft, wherein the spiral cut transition member includes a spiral cut with a pitch that varies along the length of the spiral cut transition member; and

    a balloon having a proximal waist attached to the outer shaft and a distal waist positioned about the joint.

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