A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
73/101
A61B 5/02 (2006.01) A61B 5/0215 (2006.01) A61B 5/022 (2006.01) A61B 5/0235 (2006.01) G06F 17/00 (2006.01)
Patent
CA 1228488
ABSTRACT OF THE DISCLOSURE Apparatus and related methods for continuous long-term non-invasive measurement of the pressure of a pulsatile fluid flowing through a flexible tube, particularly human arterial blood flow, is disclosed. Specifically, the apparatus provides a continuous calibrated pressure measurement by first undertaking a "calibration" phase comprised of determining the pressure at various pre-defined conditions of flow and, in response thereto, ascertaining the values of a plurality of coefficients each of which is associated with a corresponding term in a pre-defined function that characterizes fluid pressure in relation to pulsatile displacement of the wall of the tube; and second, undertaking a "continuous monitoring" phase comprised of determining each subsequently occurring pressure value as the pre-defined function of each corresponding pulsatile wall displacement value, and re-initiating the calibration phase at the expiration of pre-defined time intervals which adaptively change based upon current and prior results. Methods, which are particularly useful in conjunction with the disclosed apparatus, for ascertaining systolic and diastolic arterial blood pressure values are also disclosed.
473520
Cortronic Corporation
Marcoux & Sher Swabey Mitchell Houle
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