Method and apparatus for non-invasively measuring hemodynamic parameters using parametrics
First Claim
1. Apparatus adapted to measure pressure of a blood vessel of a living subject, comprising:
- a digital processor;
a pressure sensor adapted to generate a signal relating to pressure applied thereto; and
wherein said digital processor is configured to receive said signal from said pressure sensor and scale said signal using a scaling factor based at least in part on a body mass index (BMI) of said subject.
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Accused Products
Abstract
An improved method and apparatus for non-invasively assessing one or more hemodynamic parameters associated with the circulatory system of a living organism. In one aspect, the invention comprises a method of measuring a hemodynamic parameter (e.g., arterial blood pressure) by applanating or compressing portions of tissue proximate to the blood vessel of concern until a desired condition is achieved, and then measuring the hemodynamic parameter. Such applanation effectively mitigates transfer and other losses created by the tissue proximate to the blood vessel, thereby facilitating accurate and robust tonometric measurement. An algorithm adapted to maintain optimal levels of applanation is also described. Methods and apparatus for scaling such hemodynamic parameter measurements based on subject physiology, and providing treatment to the subject based on the measured parameters, are also disclosed.
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Citations
25 Claims
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1. Apparatus adapted to measure pressure of a blood vessel of a living subject, comprising:
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a digital processor; a pressure sensor adapted to generate a signal relating to pressure applied thereto; and wherein said digital processor is configured to receive said signal from said pressure sensor and scale said signal using a scaling factor based at least in part on a body mass index (BMI) of said subject. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of measuring pulse pressure of a living subject, comprising:
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utilizing a pressure sensor to obtain a plurality of pressure values associated with a systolic and diastolic pressure of a blood vessel of said living subject; utilizing said plurality of pressure values to determine a pulse pressure of said living subject; deriving a scaling factor based at least in part on a body mass index (BMI) of said subject; scaling said determined pulse pressure using said scaling factor using at least a processor associated with said pressure sensor; and presenting said scaled pulse pressure to a user. - View Dependent Claims (9, 10, 11)
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12. A method of measuring pulse pressure of a living subject, comprising:
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obtaining via pressure sensor a plurality of pressure values associated with a blood vessel of said living subject; deriving a scaling factor based on body mass index (BMI); using at least a processor associated with said pressure sensor to scale said plurality of pressure values using said scaling factor; and utilizing at least said scaled pressure values to generate a pulse pressure value of said living subject. - View Dependent Claims (13, 14, 15)
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16. A method of measuring pulse pressure of a living subject, comprising:
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utilizing a pressure sensor to measure a plurality of pressure values of a blood vessel of said living subject; determining a physiological parameter of said living subject; deriving a scaling factor based at least in part on said physiological parameter via a processor in communication with said pressure sensor, said physiological parameter comprising a ratio of body mass index (BMI) to wrist circumference (WC); said processor scaling said plurality of pressure values using said scaling factor; and utilizing said scaled pressure values to generate at least one pulsatile pressure value via said processor. - View Dependent Claims (17, 18, 19)
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20. Apparatus for measuring the pulse pressure of a living subject, comprising:
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a first means for generating a signal relating to pressure in a blood vessel of said subject, said signal being affected at least in part by tissue interposed between said first means and a blood vessel of said subject; a second means for scaling said signal using a scaling factor, said scaling factor comprising a value derived from at least a wrist circumference (WC) of said subject; a third means for outputting a value for said pulse pressure based on said scaled signal; and a fourth means for mitigating the effects of said tissue on said signal, said first and fourth means being disposed proximate to one another. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification