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; and
means, coupled to said cuff inflating and deflating means, for determining volumetric measurements of arterial blood, including an orifice of known pressure flow characteristics.
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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 using a volume of known 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.
50 Citations
11 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; and means, coupled to said cuff inflating and deflating means, for determining volumetric measurements of arterial blood, including an orifice of known pressure flow characteristics. - View Dependent Claims (2, 3, 4)
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5. A method of determining arterial capacity comprising the steps of:
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inflating a cuff around a peripheral part of a body; incrementally deflating said cuff; detecting pressure levels within said cuff during said deflating of said cuff; determining incremental quantities of air removed from said cuff during the deflating of said cuff; and computing arterial capacity as a function of said pressure levels and said incremental quantities of air. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification