| 摘要 |
A pressure pad (1) has two sets of cells (11, 12), fluid supply lines (14), a pump (6) to inflate the cells, a sensor pad (8) beneath the pressure pad, and a supply line to an exhaust through the sensor. Change in patient position/weight causes flow in tube (10) to alter differential pressure measured by a pressure transducer (16). Control means (50) controls the output of the pump to increase/decrease the supply of fluid to the cells depending upon the rate of fluid exhaust at the sensor exit. This is achieved by microprocessor control of power delivered to the pump (6) by varying the pulse wave modulation to the compressor(s) (C1, C2), thus adjusting the airflow to the cells. The pressure pad is segmented into heel, upper leg, torso and head sections, with the torso section being maintained at a higher pressure than the other sections. The pressure pad is an alternating or static pad.
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