Surgery – Diagnostic testing – Cardiovascular
Patent
1997-04-30
1998-05-26
Nasser, Robert L.
Surgery
Diagnostic testing
Cardiovascular
600495, 600500, A61B 500
Patent
active
057556695
ABSTRACT:
After an initial blood pressure measurement using a cuff 2 has been made, not only a pulse wave propagation time Tt is counted consecutively, but also a pulse wave propagation time change .DELTA.T is calculated every time the pulse wave propagation time Tt is counted and compared with a pulse wave propagation change threshold .DELTA.Ts. When the pulse wave propagation time change .DELTA.T exceeds the pulse wave propagation time change threshold .DELTA.Ts, not only a blood pressure value BPt is measured with the cuff 2, but also a pulse wave propagation time Tt.sub.1 is counted. If there are at least two sets of data, each set of data consisting of a blood pressure value BPt and a pulse wave propagation time Tt.sub.1, coefficients .alpha., .beta. specific to a subject are calculated from such two sets of data by a least-squares method. Then, the pulse wave propagation time change threshold .DELTA.Ts is calculated from the coefficient .alpha., and the current pulse wave propagation time change threshold .DELTA.Ts is updated.
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Chen Wenxi
Kasuya Hiromitsu
Ono Kohei
Sohma Takeshi
Sugo Yoshihiro
Nasser Robert L.
Nihon Kohden Corporation
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