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
0 Petitions
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) 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.
4 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 (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. 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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21. 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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22. 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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23. 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