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Transurethral needle ablation system

  • US 7,261,710 B2
  • Filed: 10/13/2004
  • Issued: 08/28/2007
  • Est. Priority Date: 10/13/2004
  • Status: Active Grant
First Claim
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1. A transurethral ablation device, comprising:

  • a transurethral catheter;

    at least one ablation needle extendable from a distal end of the catheter to penetrate prostate tissue of a patient and to deliver ablation energy to the prostate tissue, wherein an insulative sheath surrounds each needle; and

    a needle deployment mechanism to advance at least one needle out of the distal end of the catheter, the needle deployment mechanism comprising;

    a lever actuatable by a physician;

    a needle block to advance the at least one needle to a desired needle depth in response to actuation of the lever;

    a sheath block to advance the sheath to a first predetermined sheath depth in response to actuation of the lever;

    a spring connected to retract the sheath block after advancement of the at least one needle to a predetermined needle depth, such that the sheath is retracted to a second predetermined sheath depth;

    a catch positioned to maintain a fixed position of the sheath block such that the second predetermined sheath depth is maintained.

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