Systolic pressure determining apparatus and process using integr

Details Systolic pressure determining apparatus and process using integr Systolic pressure determining apparatus and process using integr

1976-12-27

1979-02-06

Michell, Robert W.

Surgery

Truss

Perineal

128 205A, A61B 502

Patent

active

041379071

ABSTRACT:
Improved method and apparatus for identifying and quantizing a substantially periodic, steeply rising wavefront of a signal in the possible presence of low amplitude interference. A time derivative of at least the steep wavefront is obtained. The derivative is then integrated over a predetermined interval in each of successive repetitions of the steep wavefront, the interval being that during which the derivative exceeds a reference level. A threshold value is established, preferably dynamically, to verify or validate that when the derivative exceeds the reference level it indeed represents the steeply rising wavefront. The integrated derivative is recognized as the quantized value of the steeply rising wavefront only if such verification occurs. The invention is suited to oscillometric determination of systolic pressure in a patient, where measurement of signal amplitude is preferably achieved by integrating the time derivative of the systolic rise wavefront.

REFERENCES:
patent: 3590811 (1971-07-01), Harris
patent: 3835840 (1974-09-01), Mount
patent: 3878833 (1975-04-01), Arneson et al.
patent: 3996925 (1976-12-01), Djordjevich
patent: 4009709 (1977-03-01), Link et al.
patent: 4035622 (1977-07-01), Obermajer

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