Mobile plethysmographic device
First Claim
1. A system for determining a premature atrial contraction event for a patient, the system comprising:
- a mobile plethysmographic device adapted to be worn on a patient, the mobile plethysmographic device comprising a processor, a memory, an optical sensor and an accelerometer, wherein the optical sensor comprises a plurality of green LEDs and a photodetector, each of the plurality of the green LEDs having a wavelength ranging from 500 nanometers to 570 nanometers; and
a display;
wherein the optical sensor is configured to generate an optical signal for the patient through reflection of an applied light from the plurality of green LEDs of the optical sensor and the intensity of the reflected light is received by the photodetector;
wherein the processor is configured to generate a plethysmographic signal for the patient from the optical signal, the plethysmographic signal comprising a plurality of pulse waves;
wherein the processor is configured to identify a maximum peak value for each pulse wave of the plurality of pulse waves of the plethysmographic signal to generate a plurality of maximum values of the plethysmographic signal;
wherein the processor is configured to calculate a plurality of time intervals between adjacent maximum values of the plethysmographic signal;
wherein the processor is configured to establish a threshold minimum time interval and a threshold maximum time interval for the plurality of time intervals; and
wherein the processor is configured to determine a premature atrial contraction event for the patient based on an identification of a time interval that is below the threshold minimum time interval followed immediately by a time interval that is above the threshold maximum time interval;
wherein the processor is configured to monitor for movement of the mobile plethysmographic device using the accelerometer to provide a signal for the movement of the mobile plethysmographic device;
wherein the processor is configured to use accelerometer information from the accelerometer to validate the premature atrial contraction event by measuring motion activity and verifying the validity of the premature atrial contraction event when the motion measured by the accelerometer remains less than a preset threshold.
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Accused Products
Abstract
A mobile plethysmographic device for detecting a Peripheral Artery Disease (“PAD”) event or other arrhythmia event is disclosed herein. The mobile plethysmographic device generates a pleth waveform, which is automatically screened by algorithms that measure the waveform to correlate, detect and store aberrations related to heart anomalies. A peripheral artery disease event for a patient is determined based on a quantative measure of blood flow in the extremities based on the differential in amplitude in the pleth signal between the arm and the two lower extremities. The changes in amplitude from the arm and one or both lower extremities can indicate PAD.
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Citations
6 Claims
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1. A system for determining a premature atrial contraction event for a patient, the system comprising:
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a mobile plethysmographic device adapted to be worn on a patient, the mobile plethysmographic device comprising a processor, a memory, an optical sensor and an accelerometer, wherein the optical sensor comprises a plurality of green LEDs and a photodetector, each of the plurality of the green LEDs having a wavelength ranging from 500 nanometers to 570 nanometers; and a display; wherein the optical sensor is configured to generate an optical signal for the patient through reflection of an applied light from the plurality of green LEDs of the optical sensor and the intensity of the reflected light is received by the photodetector; wherein the processor is configured to generate a plethysmographic signal for the patient from the optical signal, the plethysmographic signal comprising a plurality of pulse waves; wherein the processor is configured to identify a maximum peak value for each pulse wave of the plurality of pulse waves of the plethysmographic signal to generate a plurality of maximum values of the plethysmographic signal; wherein the processor is configured to calculate a plurality of time intervals between adjacent maximum values of the plethysmographic signal; wherein the processor is configured to establish a threshold minimum time interval and a threshold maximum time interval for the plurality of time intervals; and wherein the processor is configured to determine a premature atrial contraction event for the patient based on an identification of a time interval that is below the threshold minimum time interval followed immediately by a time interval that is above the threshold maximum time interval; wherein the processor is configured to monitor for movement of the mobile plethysmographic device using the accelerometer to provide a signal for the movement of the mobile plethysmographic device; wherein the processor is configured to use accelerometer information from the accelerometer to validate the premature atrial contraction event by measuring motion activity and verifying the validity of the premature atrial contraction event when the motion measured by the accelerometer remains less than a preset threshold. - View Dependent Claims (2, 3, 4)
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5. A mobile plethysmographic device for determining an arrhythmia event for a patient, the mobile plethysmographic device comprising:
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a processor; a memory; an optical sensor comprising a plurality of green LEDs and a photodetector, each of the plurality of the green LEDs having a wavelength ranging from 500 nanometers to 570 nanometers; and an accelerometer; wherein the mobile plethysmographic device is adapted to be worn on a patient; wherein the optical sensor is configured to generate an optical signal for the patient through reflection of an applied light from the plurality of green LEDs of the optical sensor and the intensity of the reflected light is received by the photodetector; wherein the processor is configured to generate a plethysmographic signal for the patient from the optical signal, the plethysmographic signal comprising a plurality of pulse waves; wherein the processor is configured to identify a maximum peak value for each pulse wave of the plurality of pulse waves of the plethysmographic signal to generate a plurality of maximum values of the plethysmographic signal; wherein the processor is configured to calculate a plurality of time intervals between adjacent maximum values of the plethysmographic signal; wherein the processor is configured to establish a threshold minimum time interval and a threshold maximum time interval for the plurality of time intervals; and wherein the processor is configured to determine an arrhythmia event for the patient based on an identification of a time interval that is outside of the threshold minimum time interval or maximum time interval followed immediately by a time interval that is above the threshold maximum time interval or minimum time interval; wherein the processor is configured to monitor for movement of the mobile plethysmographic device using the three axis accelerometer to provide a signal for the movement of the mobile device; wherein the processor is configured to use three axis accelerometer information from the accelerometer to validate the arrhythmia event by measuring motion activity and verifying the validity of the arrhythmia event when the motion measured by the accelerometer remains less than a preset threshold. - View Dependent Claims (6)
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Specification