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Apparatus for topical negative pressure therapy

  • US 8,617,129 B2
  • Filed: 11/11/2008
  • Issued: 12/31/2013
  • Est. Priority Date: 12/06/2007
  • Status: Active Grant
First Claim
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1. Apparatus for the provision of topical negative pressure therapy to a wound site, the apparatus comprising:

  • vacuum generating means being operably connected to a dressing at said wound site by aspiration conduit means;

    pressure sensing conduit means in fluid communication with said aspiration conduit means at a junction adjacent said dressing;

    first pressure sensing means between said junction and said vacuum generating means;

    second pressure sensing means operably associated with said pressure sensing conduit means;

    a valve associated with said pressure sensing conduit means;

    diagnostic means in communication with said first and second pressure sensing means; and

    control means in communication with said diagnostic means for controlling pressure in said aspiration and said pressure sensing conduit means,wherein the control means is configured to;

    detect a blockage in the aspiration conduit means based on comparison of a pressure difference between pressure sensed by the first pressure sensing means and pressure sensed by the second pressure sensing means with a pressure difference threshold;

    open the valve in response to detecting the blockage;

    close the valve if the pressure difference falls to substantially zero after expiration of a first time interval; and

    activate a blockage alarm if the pressure difference does not fall to substantially zero after expiration of a second time interval, the blockage alarm configured to indicate the blockage in the aspiration conduit means.

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