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Variable stiffness catheter

  • US 9,370,639 B2
  • Filed: 03/12/2014
  • Issued: 06/21/2016
  • Est. Priority Date: 03/12/2013
  • Status: Active Grant
First Claim
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1. A variable stiffness catheter comprising:

  • an outer layer having a bore with an inner surface;

    an inner layer disposed within the bore and being coaxial with the outer layer, the inner layer having an outer surface;

    a first coil having a first helical axis coaxial with the inner layer and comprising a first wire wrapped around the first helical axis in a first plurality of turns disposed between the inner surface and the outer surface, the first coil being fixed in place relative to the outer layer and the inner layer; and

    a second coil having a second helical axis coaxial with the inner layer, the second coil being comprising a second wire wrapped around the second helical axis in a second plurality of turns disposed between the first inner surface and the second inner surface, and between turns of the first plurality of turns, the second coil being rotatable about the second helical axis relative to the outer layer, the inner layer, and the first coil.

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