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Pressure regulated irrigation system for arthroscopy

  • US 4,604,089 A
  • Filed: 08/15/1983
  • Issued: 08/05/1986
  • Est. Priority Date: 08/15/1983
  • Status: Expired due to Term
First Claim
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1. A pressure regulated irrigation system comprising:

  • means for providing access to and egress from the irrigation site;

    means in fluid communication with said access and egress means for providing a closed loop fluid circuit about the irrigation site;

    means for connecting a reservoir of irrigation fluid into said circuit;

    pump means in fluid communication with and connected in series with said reservoir connection means; and

    ,a pressure regulation circuit in fluid communication with and connected in series with said pump means and said reservoir connection means, said pressure regulation circuit including an operator first input means for elevating the pressure in said irrigation site to a desired level in response to an operator first input signal and for maintaining said pressure at said desired level when said operator first input signal is terminated; and

    ,said pressure regulation circuit further including an operator second input means for reducing the pressure at said irrigation site in response to an operator second input signal and for maintaining said pressure at said reduced level when said second input signal is terminated;

    wherein said pressure regulation circuit includes a flow restriction branch and a pressure accumulation branch connected in parallel with said flow restriction branch;

    said flow restriction branch including said operator first input means and a pressure regulator downstream of and connected in series with said operator first input means;

    said pressure accumulation branch including said operator second input means, a pressure accumulation means upstream of and connected in series with said operator second input means and a check valve means upstream of and connected in series with said pressure accumulation means; and

    ,means for transmitting a signal representative of the pressure in said pressure accumulation branch to control said pressure regulator in said flow restriction branch.

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