MEASUREMENT OF PHYSIOLOGICAL SIGNALS
First Claim
1. A system comprising:
- an optical sensor configured to be positioned on an area of skin of a patient, the optical sensor including;
a light source for illuminating a capillary bed in the area of skin;
a photodetector configured to receive an optical signal from the capillary bed resulting from the illumination and to convert the optical signal into an electrical signal, the optical signal characterizing a fluctuation in a level of blood in the capillary bed; and
a signal processing module configured to process the electrical signal using a nonstationary frequency estimation method to obtain a processed signal related to at least one of a heart rate and a respiration rate of the patient.
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Accused Products
Abstract
A system includes an optical sensor and a signal processing module. The optical sensor is configured to be positioned on an area of skin of a patient. The optical sensor includes a light source for illuminating a capillary bed in the area of skin and a photodetector. The photodetector is configured to receive an optical signal from the capillary bed resulting from the illumination and to convert the optical signal into an electrical signal, the optical signal characterizing a fluctuation in a level of blood in the capillary bed. The signal processing module is configured to process the electric signal using a nonstationary frequency estimation method to obtain a processed signal related to at least one of a heart rate and a respiration rate of the patient. Another aspect relates to obtaining a quantity related to the blood pressure of the patient in addition to or instead of obtaining a processed signal related to at least one of the heart rate and the respiration rate of the patient.
159 Citations
29 Claims
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1. A system comprising:
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an optical sensor configured to be positioned on an area of skin of a patient, the optical sensor including; a light source for illuminating a capillary bed in the area of skin; a photodetector configured to receive an optical signal from the capillary bed resulting from the illumination and to convert the optical signal into an electrical signal, the optical signal characterizing a fluctuation in a level of blood in the capillary bed; and a signal processing module configured to process the electrical signal using a nonstationary frequency estimation method to obtain a processed signal related to at least one of a heart rate and a respiration rate of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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illuminating a capillary bed in an area of skin of a patient; receiving an optical signal from the capillary bed resulting from the illumination; converting the optical signal into an electrical signal, the optical signal characterizing a fluctuation in a level of blood in the capillary bed; and processing the electrical signal using a nonstationary frequency estimation method to obtain a processed signal related to at least one of a heart rate and a respiration rate of the patient. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method for monitoring a blood pressure of a patient, comprising:
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illuminating a capillary bed in an area of skin of a patient; receiving an optical signal from the capillary bed resulting from the illumination; converting the optical signal into an electrical signal, the optical signal characterizing a fluctuation in a level of blood in the capillary bed of the patient; and processing the electrical signal using a model characterizing a relationship of the fluctuation in the level of blood and the blood pressure of the patient to obtain a quantity related to the blood pressure of the patient. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification