System and method for non-invasive instantaneous and continuous measurement of cardiac chamber volume
First Claim
1. A method for determining changes in cardiac chamber volume in a body using an ultrawideband (UWB) medical radar transceiver, the UWB medical radar transceiver including a transmitter and a receiver and a signal processor including software elements and a central processing unit, the method comprising:
- (a) transmitting from said transceiver a series of electromagnetic pulses into a body such that said electromagnetic impulses encounter a boundary between different biological regions in the body and small amounts of incident energy from said electromagnetic pulses encountering the boundary are reflected back towards said receiver as raw reflections;
(b) capturing said raw reflections and pre-processing them using said receiver wherein said receiver captures a plurality of said raw reflections using a high speed sample and hold circuit where capture time for a sample of said raw reflections is set equal to a round trip time of flight from said transmitter to one or more depth ranges of interest and back to said receiver;
(c) integrating said plurality of sampled reflections from said depth ranges of interest to form an integrated signal;
(d) filtering said integrated signal to minimize irrelevant high frequency noise so as to avoid corruption of desired data related to tracking instantaneous cardiac chamber volume;
(e) amplifying said integrated signal and passing said signal through a low-pass filter to prevent signal aliasing prior to digitization;
(f) collecting and integrating a predetermined number of reflections for a first range of interest(g) changing said receiver sample timing and capturing reflections from a next range of interest(h) repeating (a) through (g) until reflections from an entire range of interest across the cardiac chamber are collected;
(i) continually repeating (h) to deliver an updated instantaneous measure of cardiac volumetric changes.
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Accused Products
Abstract
A system and method for non-invasive and continuous measurement of cardiac chamber volume and derivative parameters including stroke volume, cardiac output and ejection fraction comprising an ultrawideband radar system having a transmitting and receiving antenna for applying ultrawideband radio signals to a target area of a subject'"'"'s anatomy wherein the receiving antenna collects and transmits signal returns from the target area which are then delivered to a data processing unit, such as an integrated processor or PDA, having software and hardware used to process the signal returns to produce a value for cardiac stroke volume and changes in cardiac stroke volume supporting multiple diagnostic requirements for emergency response and medical personnel whether located in the battlefield, at a disaster site or at a hospital or other treatment facility.
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Citations
19 Claims
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1. A method for determining changes in cardiac chamber volume in a body using an ultrawideband (UWB) medical radar transceiver, the UWB medical radar transceiver including a transmitter and a receiver and a signal processor including software elements and a central processing unit, the method comprising:
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(a) transmitting from said transceiver a series of electromagnetic pulses into a body such that said electromagnetic impulses encounter a boundary between different biological regions in the body and small amounts of incident energy from said electromagnetic pulses encountering the boundary are reflected back towards said receiver as raw reflections; (b) capturing said raw reflections and pre-processing them using said receiver wherein said receiver captures a plurality of said raw reflections using a high speed sample and hold circuit where capture time for a sample of said raw reflections is set equal to a round trip time of flight from said transmitter to one or more depth ranges of interest and back to said receiver; (c) integrating said plurality of sampled reflections from said depth ranges of interest to form an integrated signal; (d) filtering said integrated signal to minimize irrelevant high frequency noise so as to avoid corruption of desired data related to tracking instantaneous cardiac chamber volume; (e) amplifying said integrated signal and passing said signal through a low-pass filter to prevent signal aliasing prior to digitization; (f) collecting and integrating a predetermined number of reflections for a first range of interest (g) changing said receiver sample timing and capturing reflections from a next range of interest (h) repeating (a) through (g) until reflections from an entire range of interest across the cardiac chamber are collected; (i) continually repeating (h) to deliver an updated instantaneous measure of cardiac volumetric changes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification