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Shielded tip catheter for lithotripsy

  • US 5,425,735 A
  • Filed: 09/22/1993
  • Issued: 06/20/1995
  • Est. Priority Date: 02/22/1989
  • Status: Expired due to Fees
First Claim
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1. A device for impacting a formation in a body passage comprising:

  • an elongate flexible member for insertion into a body passage;

    a housing defining a proximal end and a distal end, the proximal end of said housing being coupled to the elongate flexible member such that, in an operative position, the housing is located within the body passage;

    a pair of electrodes located within said housing and defining a spark gap disposed within said housing wherein the electrodes are disposed within a tube which is attached to an inner wall of the housing;

    a piston, defining an impact element extendable beyond the distal end of said housing, said piston being mounted within said housing such that, in response to a spark being generated across said spark gap, said piston moves axially within said housing away from a rest position so that the impact element moves away from the distal end of said housing; and

    a spring located within the housing, the spring being located between the piston and the housing, wherein the spring is biased to return said piston to said rest position after a discharge from said electrodes has driven said piston away from said rest position.

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