Apparatus and process using second derivative of...

Details Apparatus and process using second derivative of... Apparatus and process using second derivative of...

A - Human Necessities

61

B

73/101, 73/164

A61B 5/02 (2006.01) A61B 5/022 (2006.01)

Patent

CA 1081995

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 reference value, those pressures then being indicated as diastolic and systolic pressure depending on whether applied pressure is increased or decreased.

293696

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