ESTIMATION OF BLOOD FLOW AND HEMODYNAMIC PARAMETERS FROM A SINGLE CHEST-WORN SENSOR, AND OTHER CIRCUITS, DEVICES AND PROCESSES
First Claim
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1. An electronic monitoring device comprising:
- an electronic processor having at least one signal input for body monitoring; and
a memory holding instructions for said electronic processor coupled to said electronic processor so that said electronic processor is operable to isolate a cardiac signal including cardiac pulses combined with other cardiac signal variations, and said electronic processor further operable to execute a filter that separates a varying blood flow signal from the cardiac pulses and to output information based on at least the varying blood flow signal.
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Abstract
An electronic monitoring device includes an electronic processor (520) having at least one signal input for body monitoring, and a memory (530) holding instructions for the electronic processor coupled to the electronic processor so that the electronic processor is operable to isolate a cardiac signal including cardiac pulses combined with other cardiac signal variations, and the electronic processor further operable to execute a filter (730) that separates a varying blood flow signal from the cardiac pulses and to output information (790) based on at least the varying blood flow signal. Other devices, sensor assemblies, electronic circuit units, and processes are also disclosed.
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Citations
44 Claims
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1. An electronic monitoring device comprising:
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an electronic processor having at least one signal input for body monitoring; and a memory holding instructions for said electronic processor coupled to said electronic processor so that said electronic processor is operable to isolate a cardiac signal including cardiac pulses combined with other cardiac signal variations, and said electronic processor further operable to execute a filter that separates a varying blood flow signal from the cardiac pulses and to output information based on at least the varying blood flow signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An accelerometer sensor assembly having a broadside portion and comprising
an accelerometer sensor circuit having an axis of acceleration sensitivity parallel to the broad side and orientable on the chest to deliver an input signal representing a component of acceleration approximately parallel to a head-to-feet body axis and including heart pulses and other variations mixed together; -
an electronic circuit responsive to said accelerometer sensor circuit and operable to execute a filter that delivers a varying blood flow signal from said input signal at least when that axis of acceleration sensitivity is approximately parallel to the head-to-feet body axis, the varying blood flow signal substantially freed of heart pulses; and an output circuit operable to send information based on the varying blood flow signal. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. An electronic monitoring process comprising:
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electronically bandpassing digital signals representing living-body monitoring signals in a range selective for a cardiac signal; and executing a filter that delivers a varying blood flow signal from the cardiac signal. - View Dependent Claims (39, 40, 41)
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42. A hemodynamic monitoring device comprising:
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an electronic processor having at least one signal input for body monitoring; and a memory holding instructions for said electronic processor coupled to said electronic processor so that said electronic processor is operable to obtain a cardiac pulse signal having a varying amplitude, and said electronic processor further operable to post-process the cardiac pulse signal to provide a time-varying output representing an estimation for at least one hemodynamic parameter based on the amplitude and selected from the group consisting of stroke volume SV and cardiac output CO. - View Dependent Claims (43, 44)
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Specification