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Circulating a liquid through a joint

  • US 5,000,733 A
  • Filed: 11/08/1989
  • Issued: 03/19/1991
  • Est. Priority Date: 08/26/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus for circulating a physiological liquid at a certain pressure and flow rate through a body cavity, the apparatus comprising:

  • a source of liquid;

    an input pump connected to the source and having a feed conduit for extending into the cavity for supplying the liquid to the cavity;

    sensor means for detecting pressure in the cavity and for generating an output corresponding to the detected pressure;

    generator means for generating an output corresponding to a reference pressure;

    means including an input-pump comparator connected to the input pump and having inputs connected to the sensor means and to the generator means for receiving the outputs therefrom and for operating the input pump such that the detected pressure corresponds at least generally to the reference pressure;

    a suction pump having a main suction conduit extending into the cavity for aspirating the liquid therefrom,a rotating tool insertable into said main suction conduit;

    means for controlling a circulation of the liquid through said cavity, said means for controlling comprising;

    an electric power source,two setpoint generator means for setting respective values of flow rates of said suction pump;

    first actuator means for switching said suction pump to either one of said two setpoint generator means,a motor for driving said rotating cutting tool,at least one section actuator means for switching said motor to the power source, anda control switch connected to said first and second actuator means.

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