Automatic tourniquet with improved pressure resolution
First Claim
1. A pneumatic tourniquet comprising:
- means for inflating and deflating a cuff;
pressure sensing means for sensing the pressure in said cuff and for producing a plurality of digital signals, each signal representative of said pressure and each signal having a pressure-to-digital signal scale such that the pressures at which the transistions between digital quanta occur are different for each signal; and
display means responsive to said plurality of signals for producing a pressure display having greater resolution than each of said digital signals.
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Accused Products
Abstract
An automatic tourniquet including a mechanism for inflating and deflating a cuff, a pressure sensing mechanism, and a mechanism for displaying the pressure. The pressure sensing mechanism includes a pressure transducer producing a pair of digital signals, and a mechanism for adjusting the signals so that the pressures at which the transitions between the digital quanta occur for one signal are different from the pressures at which the transitions occur for the other signal. The mechanism for adjusting includes a mechanism for setting the signals to be equal at a selected pressure, and a mechanism for offsetting the signals from each other by a voltage corresponding to one-half a digital quantum. The offset signals are summed by a microprocessor to produce a display with twice the resolution of the individual signals.
30 Citations
15 Claims
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1. A pneumatic tourniquet comprising:
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means for inflating and deflating a cuff; pressure sensing means for sensing the pressure in said cuff and for producing a plurality of digital signals, each signal representative of said pressure and each signal having a pressure-to-digital signal scale such that the pressures at which the transistions between digital quanta occur are different for each signal; and display means responsive to said plurality of signals for producing a pressure display having greater resolution than each of said digital signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification