Method and apparatus for non-invasive, cuffless continuous blood

Details Method and apparatus for non-invasive, cuffless continuous blood Method and apparatus for non-invasive, cuffless continuous blood

1998-05-18

1999-01-12

Nasser, Robert L.

Surgery

Diagnostic testing

Cardiovascular

600490, 600494, 600500, 600480, 600503, A61B 0500

Patent

active

058579753

ABSTRACT:
Arterial blood pressure of a subject is determined by detecting the EKG for the subject and selecting a fiducial point on the EKG during a pulse. Apparatus is provided for monitoring blood volume versus time at a selected location on the subject's body such as a fingertip. A time difference between the occurrence of the selected fiducial point on the EKG and a selected change in blood in volume at the selected body location is determined. This time difference depends on the arrival time of the pulse at the distal location in addition to the shape of the blood volume versus time curve. Heart rate is determined from the EKG. The arterial pressure is computed from pulse arrival time, volumetric wave shape and instantaneous heart rate for each pulse. It is preferred that the fiducial point on the EKG be an R-wave. A suitable method for determining change in blood volume utilizes photoplethysmography. Methods are disclosed for determining diastolic pressure, systolic and mean arterial pressure. In another aspect, artifact detection and rejection enabled. The invention provides for a continuous measure of blood pressure in a non-invasive, cuffless manner.

REFERENCES:
patent: 4869262 (1989-09-01), Orr et al.
patent: 4907596 (1990-03-01), Schmid et al.
patent: 5368040 (1994-11-01), Carney

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