Dual physiological rate measurement instrument

Details Dual physiological rate measurement instrument Dual physiological rate measurement instrument

1988-04-15

1990-06-26

Howell, Kyle L.

Surgery

Truss

Pad

128689, 128706, 128716, 331 1R, 331 17, 331 25, A61B 50205

Patent

active

049363093

ABSTRACT:
The object of the invention is to provide an instrument for converting a physiological pulse rate into a corresponding linear output voltage.
The instrument (1) which accurately measures the rate of an unknown rectangular pulse wave (9) over an extended range of values, comprises a phase-locked loop (8) including a phase comparator (4), a filtering network (6), and a voltage-controlled oscillator (5), arranged in cascade. The phase comparator has a first input (10) responsive to the pulse wave and a second input (11) responsive to the output signal of the voltage-controlled oscillator. The comparator (4) provides a signal dependent on the difference in phase and frequency between the signals appearing on the first and second inputs. A high-input impedance amplifier (16) accepts an output from the filtering network and provides an amplified output DC signal to a utilization device (16) for providing a measurement of the rate of the pulse wave.

REFERENCES:
patent: 4182315 (1980-01-01), Vas et al.
patent: 4256008 (1981-03-01), Ryon
patent: 4414504 (1983-11-01), Kennedy
Technical Specifications for 4046, RCA Databook, 1980, pp. 176-181.

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