Personal health device
View Patent ↗An active pulse blood constituent monitor is disclosed. A sensor configured to provide an artificial excitation to a portion of the patient at a known frequency provides additional information in determining the physiological condition of the patient.
1. A system configured to determine one or more physiological parameters noninvasively using optical based techniques, the system comprising:
one or more light emitting devices configured to emit light at one or more wavelengths into a measurement site of a patient;
one or more detectors configured to detect light emitted from the one or more light emitting devices after absorption by body tissue, and generate a detector signal, the one or more detectors comprising a submount configured to actuate relative to a support structure of the one or more detectors, the submount comprising a protrusion having a cylindrical shape;
at least one motor configured to rotate at a known rate providing an agitation through the submount and the protrusion at a known frequency at the measurement site to generate a pulse wave which is transferred to the body tissue, the pulse wave generated at a frequency higher than at least two harmonics of a natural heart rate of the patient and lower than about 50 Hz, the motor comprising an actuator of an oval cylindrical shape including a shaft, wherein the motor is configured to actuate the submount with a force that drives that protrusion between about 0.1 mm and about 0.5 mm into the measurement site and wherein the protrusion maintains in contact with the measurement site during measurement;
a processor configured to receive the detector signal, wherein the detector signal is indicative of the natural heart rate pulse of the patient and the generated pulse wave, the processor configured to determine at least one physiological parameter of the body tissue under measurement by compensating the detected information indicative of the natural heart rate pulse with information indicative of the generated pulse wave; and
a user interface configured to receive and display the at least one physiological parameter of the body tissue under measurement determined by the processor.
2. The system of claim 1 , wherein the generated pulse wave does not affect the arterial pulse wave.
3. The system of claim 1 , wherein a change in pressure in the body tissue caused by the generated pulse wave does not affect the natural heart rate pulse.
4. The system of claim 3 , wherein the change in pressure caused by the natural heart rate pulse does not affect the generated pulse wave.
5. The system of claim 1 , wherein the generated pulse wave has a frequency between 8 Hz and 12 Hz.
6. The system of claim 5 , wherein the generated pulse wave has a frequency of 8 Hz.
7. The system of claim 5 , wherein the generated pulse wave has a frequency of 12 Hz.
8. The system of claim 1 , wherein the information from the generated pulse wave comprises phase shift information.
9. A method of determining one or more physiological parameters noninvasively using optical based techniques, the method comprising:
emitting one or more wavelengths of light into a measurement site of a patient using one or more light emitting devices;
generating a pulse wave, using a motor comprising an actuator of an oval cylindrical shape including a shaft, at the measurement site at a known rate, the pulse wave generated at a frequency higher than at least two harmonics of a natural heart rate of the patient and lower than about 50 Hz;
detecting the light after attenuation by tissue at the measurement site of the patient using one or more detectors, and generating a signal based on the detected light, wherein the generated signal includes information from both the natural heart rate pulse and the generated pulse;
driving, using the motor, a submount including a protrusion between about 0.1 mm and about 0.5 mm into the measurement site based on the generated pulse wave, wherein the motor maintains the protrusion in contact with the measurement site; and
determining and displaying at least one physiological parameter of the patient by compensating the information from the detected natural heart rate pulse with information from the detected generated pulse wave.
10. The method of claim 9 , wherein the generated pulse wave does not affect the arterial pulse wave.
11. The method of claim 9 , wherein a change in pressure at the measurement site caused by the generated pulse wave does not affect the natural heart rate pulse.
12. The method of claim 11 , wherein the change in pressure caused by the natural heart rate pulse does not affect the generated pulse wave.
13. The method of claim 9 , wherein the generated pulse wave has a frequency between 8 Hz and 12 Hz.
14. The method of claim 13 , wherein the generated pulse wave has a frequency of 8 Hz.
15. The method of claim 13 , wherein the generated pulse wave has a frequency of 12 Hz.
16. The method of claim 9 , wherein the information from the generated pulse wave comprises phase shift information.