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Blood Pressure Measuring Transducer

IP.com Disclosure Number: IPCOM000096843D
Original Publication Date: 1963-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Fiegel, LJ: AUTHOR [+3]

Abstract

An arm cuff, not shown, of the type usually used to make blood pressure measurements, is pressurized from a source, not shown.

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Blood Pressure Measuring Transducer

An arm cuff, not shown, of the type usually used to make blood pressure measurements, is pressurized from a source, not shown.

Air-actuated bellows 10 is connected to the arm cuff by means of conductor 15 for conducting air under pressure. Pushrod 20 is connected to one end of bellows 10 so as to be actuated by it and is connected at its other end to cantilever-mounted reflector carrier 25. This carries a reflective element 30 disposed to lie above a block 35 mounting light source 40 and light sensitive element 45 in a laterally spaced relationship. Ambient light is shielded from 45 by means of housing 50. connections are provided to light source 40. element 45 is connected to ground potential through resistor R and to a positive potential. Capacitor C is connected between resistor R and amplifier 55.

The dotted line shows the reflector position, when the arm cuff is inflated to approximately 300 mm of mercury. As pressure is reduced in the arm cuff at a linear rate, carrier 25 and reflector 30 bounce in a manner similar to a manometer needle, so as to generate an AC signal proportional to the amplitude of the movement. Capacitor C passes the generated signal to amplifier 55 and also blocks the DC signal generated across R. A first signal passed to amplifier 55 is indicative of systolic pressure and then, when the pulses cease, this is indicative of diastolic pressure.

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