Tissue perfusion sensor control
First Claim
1. A method comprising:
- receiving an electrical signal from an optical perfusion sensing module, wherein the electrical signal is indicative of a blood oxygen saturation level of a patient;
determining a perfusion value based on the electrical signal is within a threshold range of values;
modifying an operation of the optical perfusion sensing module in response to determining the perfusion value is within the threshold range of values, wherein modifying the operation of the optical perfusion sensing module comprises, while the optical perfusion sensing module remains powered on, stopping storage of any electrical signals indicative of the blood oxygen saturation level of the patient generated by the optical perfusion sensing module in a memory, andcontrolling an operation of a cardiac signal sensing module based on the electrical signal generated by the optical perfusion sensing module.
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Abstract
An optical perfusion sensor may monitor blood oxygen saturation of blood-perfused tissue, which may be referred to as tissue perfusion, until a tissue perfusion value is within a threshold range of a reference value, and, in some examples, for at least a minimum period of time. The tissue perfusion value may indicate an absolute blood oxygen saturation level or a relative change in blood oxygen saturation level. The reference value may be, for example, determined by an oxygen (O2) variation index that indicates a change in blood oxygen saturation of tissue. In some examples, the optical perfusion sensor may be activated upon detecting a cardiac event, such as a cardiac arrhythmia. In addition, in some examples, cardiac signal monitoring may be activated upon detecting a threshold change in tissue perfusion.
36 Citations
29 Claims
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1. A method comprising:
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receiving an electrical signal from an optical perfusion sensing module, wherein the electrical signal is indicative of a blood oxygen saturation level of a patient; determining a perfusion value based on the electrical signal is within a threshold range of values; modifying an operation of the optical perfusion sensing module in response to determining the perfusion value is within the threshold range of values, wherein modifying the operation of the optical perfusion sensing module comprises, while the optical perfusion sensing module remains powered on, stopping storage of any electrical signals indicative of the blood oxygen saturation level of the patient generated by the optical perfusion sensing module in a memory, and controlling an operation of a cardiac signal sensing module based on the electrical signal generated by the optical perfusion sensing module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system comprising:
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a memory; a cardiac signal sensing module; an optical perfusion sensing module configured to generate an electrical signal indicative of a blood oxygen saturation level of a patient; and a processor configured to receive the electrical signal from the optical perfusion sensing module, determine a perfusion value based on the electrical signal is within a threshold range of values, store at least one of the electrical signal or the perfusion value in the memory, control an operation of the cardiac signal sensing module based on the electrical signal generated by the optical perfusion sensing module, and modify an operation of the optical perfusion sensing module in response to determining the perfusion value is within the threshold range of values, wherein the modification of the operation comprises, while the optical perfusion sensing module remains powered on, stopping storage of any electrical signals indicative of the blood oxygen saturation level of the patient generated by the optical perfusion sensing module in the memory. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A system comprising:
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means for receiving an electrical signal from an optical perfusion sensing module, wherein the electrical signal is indicative of a blood oxygen saturation level of a patient; means for determining a perfusion value based on the electrical signal is within a threshold range of values; means for storing at least one of the electrical signal or the perfusion value; means for modifying an operation of the optical perfusion sensing module in response to the determination that the perfusion value is within the threshold range of values by the means for determining, wherein the means for modifying modifies the operation of the optical perfusion sensing module by at least, while the optical perfusion sensing module remains powered on, stopping storage of any electrical signals indicative of the blood oxygen saturation level of the patient generated by the optical perfusion sensing module in the means for storing; means for generating a cardiac signal indicative of electrical activity of a heart of the patient; and means for controlling an operation of the means for generating a cardiac signal based on the electrical signal generated by the optical perfusion sensing module. - View Dependent Claims (27, 28)
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29. A computer-readable medium comprising instructions that, when executed by a processor, cause the processor to:
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receive an electrical signal from an optical perfusion sensing module, wherein the electrical signal is indicative of a blood oxygen saturation level of a patient; determine a perfusion value based on the electrical signal is within a threshold range of values; modify an operation of the optical perfusion sensing module in response to determining the perfusion value is within the threshold range of values, wherein the instructions, when executed by the processor, cause the processor to modify the operation of the optical perfusion sensing module by at least while the optical perfusion sensing module remains powered on, stopping storage of any electrical signals indicative of the blood oxygen saturation level of the patient generated by the optical perfusion sensing module in a memory; and control an operation of a cardiac signal sensing module based on the electrical signal generated by the optical perfusion sensing module.
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Specification