| 摘要 |
A method and apparatus for non-invasively measuring a physiological parameter of a subject, by applying to a body part of the subject a venous occlusion plethysmographic device including a first section having a first fluid chamber to engage a first region of the body part, and at least a second section having a second fluid chamber to engage a second region of the body part, proximally located to the first region at the site thereof facing the heart of the subject; pressurizing the first fluid chamber to a pressure sufficient to compensate for hydrostatic pressure added to the inherent venous pressure at the maximal vertical lowering level of the body part with respect to the subject's heart level; intermittently raising and lowering the pressure in the second fluid chamber to a pressure above or equal to the pressure in the first chamber, but below the arterial blood pressure; measuring changes in volume of the first region of the body part; and utilizing the measured volume changes to provide a measure of the physiological parameter. |
