METHOD AND APPARATUS FOR NON-INVASIVELY MEASURING HEMODYNAMIC PARAMETERS USING PARAMETRICS
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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
99 Claims
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1-74. -74. (canceled)
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75. A method of measuring the 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 at least one physiological parameter; using at least one algorithm run on 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 (76, 77, 78)
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79. Apparatus adapted to measure the 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 at least one computer program configured to run on the digital processor and further configured to scale said signal using a scaling factor based at least in part on a derived parameter particularly associated with the physiology of said subject. - View Dependent Claims (80, 81, 82, 83, 84, 85)
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86. A method of measuring the 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 at least one physiologic parameter; scaling said determined pulse pressure using said scaling factor using at least one algorithm run on a processor associated with said pressure sensor; and presenting said scaled pulse pressure to a user. - View Dependent Claims (87, 88)
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89. A method of measuring the 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; scaling said plurality of pressure values using said scaling factor; and utilizing said scaled pressure values to generate at least one pulsatile pressure value. - View Dependent Claims (90, 91, 92)
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93. 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; a second means for scaling said signal using a scaling factor, said scaling factor comprising a value derived from at least one physiological parameter of said subject; and a third means for outputting as a value for said pulse pressure said scaled signal. - View Dependent Claims (94, 95, 96, 97, 98, 99)
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Specification