Apparatus and process using second derivative of oscillometric w

Details Apparatus and process using second derivative of oscillometric w Apparatus and process using second derivative of oscillometric w

1976-12-27

1979-05-15

Michell, Robert W.

Surgery

Truss

Pad

A61B 502

Patent

active

041542380

ABSTRACT:
An improved method and apparatus for determining blood pressure in a system employing a variable pressure cuff and having means for sensing a quantity comprising the sum of applied cuff pressure and a component representative of pulsatile pressure in a blood vessel, a particular time derivative of at least the fluctuating component of the quantity is obtained and utilized for determining blood pressure. More specifically, the particular time derivative comprises the second (or greater) derivative and it is analyzed to determine at what applied pressure it first and last crosses a negative threshold value, those pressures then being indicated as diastolic and systolic pressure depending on whether applied pressure is increased or decreased. The threshold value may be dynamically determined.

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