Shock reduction using absolute calibrated tissue oxygen saturation and total hemoglobin volume fraction
First Claim
1. An implantable medical device, comprising:
- a cardiac electrode for sensing cardiac depolarization signals;
an optical sensor for providing a signal corresponding to light attenuation by a volume of blood perfused tissue;
a control module coupled to the optical sensor controlling the light emitted by the optical sensor;
a monitoring module receiving an optical sensor output signal and measuring light attenuation;
a tissue electrode for stimulating the volume of blood perfused tissue;
a pulse generator coupled to the tissue electrode for delivering electrical stimulation to the volume of blood-perfused tissue; and
a processor coupled to the cardiac electrode and the monitoring module and configured to detect an arrhythmia in response to the depolarization signals, compute a tissue oxygenation measurement in response to detecting the arrhythmia, control the pulse generator to deliver electrical stimulation to the volume of blood-perfused tissue in response to detecting the arrhythmia, determine one of a rate of tissue oxygenation decline and a rate of tissue oxygenation recovery, and detect a hemodynamic status of the arrhythmia in response to at least one of the rate of tissue oxygenation decline and the rate of tissue oxygenation recovery.
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Accused Products
Abstract
An implantable medical device that includes an optical sensor for providing a signal corresponding to light attenuation by a volume of blood perfused tissue, a control module coupled to the optical sensor controlling the light emitted by the optical sensor, a monitoring module receiving an optical sensor output signal and measuring light attenuation, a tissue electrode for stimulating the volume of blood perfused tissue, a pulse generator coupled to the tissue electrode for delivering electrical stimulation to the volume of blood-perfused tissue, and a processor coupled to the cardiac electrode and the monitoring module and configured to detect an arrhythmia in response to the depolarization signals, compute a tissue oxygenation measurement and control the pulse generator to deliver electrical stimulation to the volume of blood-perfused tissue in response to detecting the arrhythmia, and detect a hemodynamic status of the arrhythmia in response to at least one of a detected rate of tissue oxygenation decline and a detected rate of tissue oxygenation recovery.
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Citations
23 Claims
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1. An implantable medical device, comprising:
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a cardiac electrode for sensing cardiac depolarization signals; an optical sensor for providing a signal corresponding to light attenuation by a volume of blood perfused tissue; a control module coupled to the optical sensor controlling the light emitted by the optical sensor; a monitoring module receiving an optical sensor output signal and measuring light attenuation; a tissue electrode for stimulating the volume of blood perfused tissue; a pulse generator coupled to the tissue electrode for delivering electrical stimulation to the volume of blood-perfused tissue; and a processor coupled to the cardiac electrode and the monitoring module and configured to detect an arrhythmia in response to the depolarization signals, compute a tissue oxygenation measurement in response to detecting the arrhythmia, control the pulse generator to deliver electrical stimulation to the volume of blood-perfused tissue in response to detecting the arrhythmia, determine one of a rate of tissue oxygenation decline and a rate of tissue oxygenation recovery, and detect a hemodynamic status of the arrhythmia in response to at least one of the rate of tissue oxygenation decline and the rate of tissue oxygenation recovery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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sensing cardiac depolarization signals; detecting an arrhythmia in response to the depolarization intervals; generating a signal corresponding to light attenuation corresponding to a volume of blood perfused tissue; determining a light attenuation in response to the generated signal; delivering electrical stimulation to the volume of blood-perfused tissue in response to detecting an arrhythmia; determining a tissue oxygenation measurement in response to detecting the arrhythmia; determining one of a rate of tissue oxygenation decline and a rate of tissue oxygenation recovery in response to the delivered electrical stimulation; and detecting a hemodynamic status of the arrhythmia in response to at least one of the rate of tissue oxygenation decline and the rate of tissue oxygenation recovery. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A non-transitory computer readable medium having computer executable instructions for performing a method comprising:
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sensing cardiac depolarization signals; detecting an arrhythmia in response to the depolarization intervals; generating a signal corresponding to light attenuation corresponding to a volume of blood perfused tissue; determining a light attenuation in response to the generated signal; delivering electrical stimulation to the volume of blood-perfused tissue in response to detecting an arrhythmia; determining a tissue oxygenation measurement in response to detecting the arrhythmia; determining one of a rate of tissue oxygenation decline and a rate of tissue oxygenation recovery in response to the delivered electrical stimulation; and detecting a hemodynamic status of the arrhythmia in response to at least one of the rate of tissue oxygenation decline and the rate of tissue oxygenation recovery.
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Specification