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Closed loop feedback air supply for air support beds

  • US 4,797,962 A
  • Filed: 11/05/1986
  • Issued: 01/17/1989
  • Est. Priority Date: 11/05/1986
  • Status: Expired due to Term
First Claim
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1. In a low air loss air support convalescent bed having a plurality of low air loss air sacs that are maintained within a desired pressure range and are arranged for supporting various body sections of a patient, the improvement comprising:

  • (a) air supply means for supplying compressed air at a pressure in excess of said desired pressure range of any of said air sacs;

    (b) air distributing means for distributing compressed air from said air supply means to said plurality of air sacs;

    (c) pressure control means having a plurality of servo valves for conducting air at preset pressure ranges to individual air sacs;

    (d) pressure monitoring means continuously monitoring the air pressure of each of said air sacs and providing pressure indicative signals; and

    (f) feedback means receiving said pressure indicative signals and providing pressure signals to said pressure control means for each of said air sacs, said pressure control means adjusting said servo valves appropriately to maintain the proper pressure range in each of said air sacs, whereby the selected interface pressure between the air sacs and the patient is established.

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