Calibration for blood pressure pulses
First Claim
1. A method of calibrating a derived pressure pulse waveform, said derived waveform being determined by processing a peripherally measured waveform, comprising the steps of:
- a. measuring at a first site a blood pressure pulse waveform;
b. measuring substantially simultaneously using a calibrated instrument the systolic and diastolic pressures at a second site;
c. determining the pulse waveform shape at said second site from the waveform measured at said first site using a first predetermined transfer function;
d. calibrating the pulse waveform shape at said second site using the measured systolic and diastolic pressures to provide a calibrated waveform;
e. determining the pulse waveform shape at a third site directly or indirectly from the waveform measured at said first site using a second predetermined transfer function;
f. calibrating the waveform at said third site from the calibrated waveform from said second site, so that a calibrated waveform is derived from said third site.
3 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is an improved arrangement for allowing more accurate automatic calibration for a system in which blood pressure pulses are derived for remote sites from a calibrated measurement and a waveform measurement, when these are made at different sites. Where a calibrated measurement is made, say, at the brachial artery (11), and a waveform recorded at the radial artery (12), a waveform is derived for the calibrated site using a known transfer function, this drived waveform is then calibrated by the measurements already made, and the calibrated waveform for any remote site, for example the ascending aorta (14), can be derived using a known transfer function.
56 Citations
13 Claims
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1. A method of calibrating a derived pressure pulse waveform, said derived waveform being determined by processing a peripherally measured waveform, comprising the steps of:
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a. measuring at a first site a blood pressure pulse waveform; b. measuring substantially simultaneously using a calibrated instrument the systolic and diastolic pressures at a second site; c. determining the pulse waveform shape at said second site from the waveform measured at said first site using a first predetermined transfer function; d. calibrating the pulse waveform shape at said second site using the measured systolic and diastolic pressures to provide a calibrated waveform; e. determining the pulse waveform shape at a third site directly or indirectly from the waveform measured at said first site using a second predetermined transfer function; f. calibrating the waveform at said third site from the calibrated waveform from said second site, so that a calibrated waveform is derived from said third site. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification