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Lithotomic apparatus

  • US 4,898,574 A
  • Filed: 02/01/1989
  • Issued: 02/06/1990
  • Est. Priority Date: 05/08/1986
  • Status: Expired due to Term
First Claim
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1. A lithotomic apparatus for treating a calculus produced in a body cavity, comprising:

  • an elongated suction probe, that can be inserted into the body cavity, including a distal end, a proximal end, an inner tube defining an instrument channel having a distal end open to the distal end of the probe, an outer tube located around the inner tube with a gap therebetween, a suction channel defined between the inner and outer tubes and having an annular cross section, and a plurality of suction holes formed in the circumference of the outer tube to communicate with the suction channel and located near the distal end of the probe;

    suction means for sucking gas from the suction holes through the suction channel;

    an elongated viewing probe, that can be inserted into the instrument channel, for viewing a region near the distal end of the suction probe;

    an elongated treating probe, having a nozzle portion at a distal end thereof, that can be inserted into the instrument channel so that the nozzle portion projects from the distal end of the suction probe;

    means for supplying a high-pressure fluid; and

    a drive mechanism for feeding the high-pressure fluid to the treating probe and pulsatively ejecting the fluid from the nozzle portion, the drive mechanism including a control circuit for controlling the ejection of the fluid and the suction of the gas so that the pressure in a body cavity can be kept at a predetermined value.

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