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Portable Blood Pressure Monitor

IP.com Disclosure Number: IPCOM000092405D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Fiegel, LJ: AUTHOR

Abstract

A portable unit including blood pressure cuff 1 having an internally mounted microphone 9, cuff pressurizer 2, Korotkoff sound detector and signal generator 3, and tape recorder 5 is worn by a patient. At intervals determined by a timer in 2 or by the patient, 2 causes 1 to be inflated to a predetermined pressure P0 which exceeds the maximum expected systolic pressure. At time T0 when P0 is reached, a valve in 2 automatically halts pressurization of 1 and initiates bleedoff of the pressure in it. Two characteristics of this valve are critical for proper operation of the system. First, the valve must halt pressurization and initiate bleedoff when the pressure in 1 reaches the precise known value P0. Secondly, the rate of the pressure bleedoff must be known and must be the same each time the system is operated.

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Portable Blood Pressure Monitor

A portable unit including blood pressure cuff 1 having an internally mounted microphone 9, cuff pressurizer 2, Korotkoff sound detector and signal generator 3, and tape recorder 5 is worn by a patient. At intervals determined by a timer in 2 or by the patient, 2 causes 1 to be inflated to a predetermined pressure P0 which exceeds the maximum expected systolic pressure. At time T0 when P0 is reached, a valve in 2 automatically halts pressurization of 1 and initiates bleedoff of the pressure in it. Two characteristics of this valve are critical for proper operation of the system. First, the valve must halt pressurization and initiate bleedoff when the pressure in 1 reaches the precise known value P0. Secondly, the rate of the pressure bleedoff must be known and must be the same each time the system is operated.

At the instant that P0 is reached and cuff bleedoff begins, 2 provides a start signal to 3, causing the latter to generate an output on line 8 to recorder 5. Then, each Korotkoff sound picked up by 9 causes a similar signal to issue on 8 and to be recorded by 5.

Systolic and diastolic blood pressure readings are subsequently determined by CPU 7 from the information recorded by 5. Since the pressure P0 and the cuff bleedoff rate are known parameters, 7 determines the systolic blood pressure PS and the diastolic blood pressure PD. Such determination is by measuring the time intervals TS - T0 and TD - T0, which are recorded, and ...