Closed loop feedback air supply for air support beds

Details Closed loop feedback air supply for air support beds Closed loop feedback air supply for air support beds

1989-10-13

1990-08-21

Trettel, Michael F.

Beds

Bedclothing

And means to facilitate changing thereof

5455, A61G 704

Patent

active

049494120

ABSTRACT:
A closed loop feeback-controlled air supply system for air support convalescent beds having groups of air sacs for supporting various body sections of a patient. The air supply system may be self-contained with its own air supply compressor or it may utilize any other source of compressed air. The air supply is coupled with a distributor manifold from which extends a plurality of air supply lines extending to selected groups of air sacs. Servo valves controlling each of the air supply lines are automatically positioned and controlled by signals from a microprocessor, the microprocessor receiving pressure feedback monitoring signals from pressure transducers associated with each of the groups of air sacs. Between the air supply and the manifold may be provided a master control valve which may be a servo valve also activated and controlled by the microprocessor responsive to feedback signals. Where the air supply is provided by a variable speed compressor, the compressor may also be responsive to control signals from the microprocessor.

REFERENCES:
patent: 3879776 (1975-04-01), Solen
patent: 4542547 (1985-09-01), Sato
patent: 4638519 (1987-01-01), Hess
patent: 4686722 (1987-08-01), Swart
patent: 4694520 (1987-09-01), Paul et al.
patent: 4722105 (1988-02-01), Douglas
patent: 4768249 (1988-09-01), Goodwin
patent: 4797962 (1989-01-01), Goode

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