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Catheter steering mechanism

  • US 5,254,088 A
  • Filed: 12/16/1992
  • Issued: 10/19/1993
  • Est. Priority Date: 02/02/1990
  • Status: Expired due to Term
First Claim
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1. A steering mechanism comprising:

  • a steering shaft having a proximal end and a distal end and a lumen therethrough;

    a coiled spring mounted in the steering shaft and having a distal end that terminates within the steering shaft short of the distal end of the steering shaft, the distal end of the steering shaft being free of any coiled spring;

    a lead spring having an axis and a bendable portion extending outside the distal end of coiled spring but still within the distal end of the steering shaft that is free of any coiled spring for bending the distal end of the steering shaft in response to an applied force relative to the coiled spring,a first steering wire extending through the lumen, having a first end attached to the lead spring a first location outside at the distal end of the coiled spring and having a second end exiting the proximal end;

    a second steering wire extending through the lumen, having a third end attached to the lead spring at a second location outside the distal end of the coiled and having a fourth end exiting the proximal end; and

    a controller positioned at the proximal end and attached to the second and fourth ends, for placing tension on at least one of the first steering wire and the second steering wire, for applying force to the steering wire to bend the distal end of the steering shaft toward the tensed steering wire.

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