Peripheral arterial monitoring instruments
First Claim
1. Instrumentation for performing measurements of arterial volume comprising:
- an inflatable cuff;
means, connected to aid cuff, for inflating said cuff and deflating said cuff by expelling air in decrements;
means for detecting pressure levels within said cuff;
means for determining a flow of the expelled decrements of air from said cuff as a function of cuff pressure;
means, responsive to said determined flow of the expelled decrements of air, for computing values of oscillation volume; and
means for computing said arterial volume as a function of said values of oscillation volume and cuff pressure.
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Accused Products
Abstract
A method and apparatus are described for determining characteristics of peripheral arterial volume and compliane. 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.
55 Citations
16 Claims
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1. Instrumentation for performing measurements of arterial volume comprising:
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an inflatable cuff; means, connected to aid cuff, for inflating said cuff and deflating said cuff by expelling air in decrements; means for detecting pressure levels within said cuff; means for determining a flow of the expelled decrements of air from said cuff as a function of cuff pressure; means, responsive to said determined flow of the expelled decrements of air, for computing values of oscillation volume; and means for computing said arterial volume as a function of said values of oscillation volume and cuff pressure. - View Dependent Claims (2, 3)
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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 within said cuff; means, coupled to said cuff inflating and deflating means, for expelling air decrementally for said cuff in a quantifiable manner, and means for determining the quantified decrements of expelled air; and means for computing arterial volume as a function of said quantified decrements of air expelled from said cuff and said detected pressure levels. - View Dependent Claims (5, 6, 7, 8)
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9. Instrumentation for performing measurements of arterial comprising:
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an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting pressure levels within said cuff; means for measuring volumetric decrements of air expelled from said cuff upon deflation, as a function of cuff pressure; means for computing arterial capacity as a function of said detected pressure levels within said cuff and the measured decrements of expelled air; means for displaying arterial capacity as a function of pressure; and means for displaying arterial capacity as a function of time. - View Dependent Claims (10, 11, 12)
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13. Instrumentation for performing measurements of the effects of an introduction of a substance in the blood stream comprising:
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an inflatable cuff; means, connected to said cuff, for inflating and deflating said cuff; means for detecting pressure levels within said cuff; means for computing arterial volume as a function of said detected pressure levels within said cuff; means for computing arterial capacity from said computed arterial volume and said detected cuff pressure levels; means for displaying arterial capacity prior to said introduction of the substance into the blood stream; and means for displaying on a comparative basis arterial capacity subsequent to said introduction of the substance into the blood stream. - View Dependent Claims (14, 15, 16)
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Specification