BODY-WORN SYSTEM FOR CONTINUOUS, NONINVASIVE MEASUREMENT OF CARDIAC OUTPUT, STROKE VOLUME, CARDIAC POWER, AND BLOOD PRESSURE
First Claim
1. A body-worn system for measuring a stroke volume value from a patient, comprising:
- a TBEV module worn on the patient'"'"'s body and comprising;
i) an electrical circuit configured to inject a current proximal to the patient'"'"'s brachium;
ii) a pair of electrical connectors located on a bottom portion of the module, the electrical connectors configured to snap into a pair of mated connectors comprised by a first electrode, with a first connector configured to inject the current into a first portion of the electrode, and a second connector configured to measure signals from a second portion of the electrode that relate to a voltage;
iii) an analog circuit configured to process the signals from the second connector to generate a voltage value; and
iv) a processor configured to convert the voltage value, or a value calculated therefrom, into a time-dependent resistance value, and then convert the time-dependent resistance value into a stroke volume value.
1 Assignment
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Accused Products
Abstract
The invention provides a system for measuring stroke volume (SV), cardiac output (CO), and cardiac power (CP) from a patient that features: 1) an impedance sensor connected to at least two body-worn electrodes and including an impedance circuit that processes analog signals from the electrodes to measure an impedance signal (e.g. a TBEV waveform); 2) an ECG sensor connected to at least two chest-worn electrodes and including an ECG circuit that processes analog signals from the electrodes to measure and ECG signal; 3) an optical sensor connected to a body-worn optical probe and including an optical circuit that processes signals from the probe to measure at least one optical signal (e.g. a PPG waveform) from the patient; 4) a processing system, typically worn on the patient'"'"'s wrist and connected through a wired interface to the optical sensor, and through either a wired or wireless interface to the TBEV and ECG sensors. The processing system analyzes the ECG, TBEV and optical signals to determine SV, and further analyzes SV and HR determined from an ECG sensor to determine CO.
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Citations
23 Claims
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1. A body-worn system for measuring a stroke volume value from a patient, comprising:
a TBEV module worn on the patient'"'"'s body and comprising;
i) an electrical circuit configured to inject a current proximal to the patient'"'"'s brachium;
ii) a pair of electrical connectors located on a bottom portion of the module, the electrical connectors configured to snap into a pair of mated connectors comprised by a first electrode, with a first connector configured to inject the current into a first portion of the electrode, and a second connector configured to measure signals from a second portion of the electrode that relate to a voltage;
iii) an analog circuit configured to process the signals from the second connector to generate a voltage value; and
iv) a processor configured to convert the voltage value, or a value calculated therefrom, into a time-dependent resistance value, and then convert the time-dependent resistance value into a stroke volume value.- View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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2. A body-worn system for measuring a cardiac output value from a patient, comprising:
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a TBEV module worn on the patient'"'"'s body and comprising;
i) an electrical circuit configured to inject a current proximal to the patient'"'"'s brachium;
ii) a first pair of electrical connectors located on a bottom portion of the TBEV module, the electrical connectors configured to snap into a pair of mated connectors comprised by a first electrode, with a first connector configured to inject the current into a first portion of the electrode, and a second connector configured to measure signals from a second portion of the electrode that relate to a voltage;
iii) an analog circuit configured to process the signals from the second connector to generate a voltage value;
iv) a first processor configured to convert the voltage value into a time-dependent resistance value, and then convert the time-dependent resistance value into a stroke volume value; and
v) a first serial port configured to receive a heart rate value from a body-worn ECG module; and
,the body-worn ECG module, comprising i) an ECG circuit configured to measure an ECG waveform from the patient;
ii) a second pair of electrical connectors located on a bottom portion of the ECG module, the electrical connectors configured to snap into a pair of mated connectors comprising (N.B.;
Accepted syntax prefers “
comprising”
, rather than “
comprised by) a second electrode, with a first connector configured to receive current injected by the first electrode, and a second connector configured to measure signals from a second portion of the electrode that relate to the voltage;
iii) a conducting wire configured to transmit signals measured by the second electrode to the analog circuit in the TBEV module; and
iv) a second serial port configured to transmit a heart rate value to the body-worn TBEV module.
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3. A body-worn system for measuring a stroke volume value from a patient, comprising:
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a TBEV module worn on the patient'"'"'s body and comprising;
i) an electrical circuit configured to inject a current proximal to the patient'"'"'s brachium;
ii) a pair of electrical connectors located on a bottom portion of the module, the electrical connectors configured to snap into a pair of mated connectors comprising a first electrode, with a first connector configured to inject the current into a first portion of the electrode, and a second connector configured to measure signals from a second portion of the electrode that relate to a voltage;
iii) an analog circuit configured to process the signals from the second connector to generate a voltage value; and
iv) a processor configured to convert the voltage value into a time-dependent resistance value, and then convert the time-dependent resistance value into a stroke volume value; and
,a harness comprising the TBEV module, a collection of conductive wires that receive and transmit digitized versions of the stroke volume value and the time-dependent resistance value, and a connector configured to detachably connect to a controller worn on the patient'"'"'s body that receives and processes the digitized versions of the stroke volume value and the time-dependent resistance value.
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4. A body-worn system for measuring a cardiac output value, comprising:
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an ECG module attached to a patient'"'"'s body using a first two-part electrode, the ECG module configured to generate a heart rate value; an impedance module attached to the patient'"'"'s body with a second two-part electrode, the impedance module configured to generate a stroke volume value from signals collected by the first and second two-part electrodes; and a processor configured to receive the heart rate and stroke volume values, and from these calculate a cardiac output value.
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5. A body-worn system for measuring a cardiac power value, comprising:
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an ECG module attached to a patient'"'"'s body, using a first two-part electrode, the ECG module configured to generate a heart rate value and an ECG waveform; an impedance module attached to the patient'"'"'s body with a second two-part electrode, the impedance module configured to generate a stroke volume value and an impedance waveform from signals collected by the first and second two-part electrodes; and
,a processor configured to receive the heart rate and stroke volume values, and the ECG and impedance waveforms, and from these calculate a cardiac power value.
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Specification