Peripheral arterial monitoring instruments
First Claim
1. Instrumentation for performing measurements of arterial volume comprising:
- an inflatable cuff;
means, connected to said cuff, for inflating and deflating said cuff;
means for detecting pressure levels of said cuff;
means, responsive to said detected pressure levels, for determining volumetric measurements of arterial blood; and
means for calibrating said volumetric determining means, including means for measuring the volume of air removed from said cuff during the deflation of said cuff.
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Accused Products
Abstract
A method and apparatus are described for determining characteristics of peripheral arterial volume and compliance. A blood pressure cuff is inflated and deflated around a limb of the body and pressure measurements are taken. The volume of air removed from the cuff is determined in a quantifiable manner, such as by expelling air through an orifice of known characteristics or by means of a volume of know characteristics. The detected pressures and volume of air removed are used to compute oscillation volume, which in turn is used to display arterial capacity and compliance as a function of transmural pressure and time. Arterial capacity may be displayed in terms of arterial radius, arterial cross-sectional area, or arterial volume. A display of these characteristics as a function of pre and post anesthetic administration is particularly useful to the anesthesiologist and surgeon.
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Citations
6 Claims
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1. Instrumentation for performing measurements of arterial volume comprising:
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an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting pressure levels of said cuff; means, responsive to said detected pressure levels, for determining volumetric measurements of arterial blood; and means for calibrating said volumetric determining means, including means for measuring the volume of air removed from said cuff during the deflation of said cuff. - View Dependent Claims (2)
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3. Instrumentation for performing measurements of arterial volume comprising:
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an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting pressure levels of said cuff; means, responsive to said detected pressure levels, for determining volumetric measurements of arterial blood; means for calibrating said volumetric determining means, including means for measuring the volume of air removed from said cuff during the deflation of said cuff; wherein said calibrating means includes means, responsive to said inflating and deflating means, for transferring a predetermined quantity of air from said cuff; and wherein said transferring means is periodically activatable to incrementally remove said predetermined quantity of air from said cuff.
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4. Instrumentation for performing measurements of arterial volume comprising:
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an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting pressure levels of said cuff; means, responsive to said detected pressure levels, for determining volumetric measurements of arterial blood; and means for calibrating said volumetric determining means, including means for measuring the volume of air removed from said cuff during the deflation of said cuff, as a function of cuff pressure. - View Dependent Claims (5, 6)
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Specification