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US 12,685,449 B2Granted
System and method for measuring blood pressure
AssigneeRockley Photonics Limited
InventorsKate LeeAnn Bechtel, Mohsen Naji
Life of this patent
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Abstract
A system and method for measuring blood pressure. In some embodiments, a system includes a speckleplethysmography sensor and a processing circuit. The system may be configured: to perform, using the speckleplethysmography sensor, blood flow measurements of a subject, and measurements of cuff pressure of a cuff worn by the subject, while the cuff pressure varies; and to calculate, from the blood flow measurements and the cuff pressure measurements, a first blood pressure.
Claims6
A method, comprising:
- measuring a first blood pressure,
- the measuring of the first blood pressure comprising:
- varying a cuff pressure of a cuff on an appendage of a subject and coupled to a controller configured to control the cuff pressure;
- generating a speckleplethysmography signal from a speckleplethysmography sensor on the appendage and coupled to the controller, the speckleplethysmography sensor comprising a coherent light source, configured to illuminate tissue of the subject, and an image sensor configured to receive light from the tissue;
- and
- determining the first blood pressure based on the speckleplethysmography signal and based on the cuff pressure,
- wherein:
- the first blood pressure is a systolic blood pressure, and
- the determining of the first blood pressure comprises:
- decreasing the cuff pressure;
- and
- determining the cuff pressure at a point in time, while the cuff pressure is decreasing, at which a measure of blood flow, based on the speckleplethysmography signal, indicates an increase in blood flow, and
- wherein the measure of blood flow is based on a method of pulse detection, comprising:
- calculating a measure of quality of a candidate pulse;
- and
- determining whether the candidate pulse is part of a sequence of pulses.
13 more elements
A method, comprising:
- measuring a first blood pressure,
- the measuring of the first blood pressure comprising:
- varying a cuff pressure of a cuff on an appendage of a subject and coupled to a controller configured to control the cuff pressure;
- generating a speckleplethysmography signal from a speckleplethysmography sensor on the appendage and coupled to the controller, the speckleplethysmography sensor comprising a coherent light source, configured to illuminate tissue of the subject, and an image sensor configured to receive light from the tissue;
- and
- determining the first blood pressure based on the speckleplethysmography signal and based on the cuff pressure,
- wherein:
- the first blood pressure is a diastolic blood pressure, and
- the determining of the first blood pressure comprises:
- decreasing the cuff pressure;
- and
- determining the cuff pressure at a point in time, while the cuff pressure is decreasing, at which the speckleplethysmography signal has a maximum amplitude.
9 more elements
A method, comprising:
- measuring a first blood pressure,
- the measuring of the first blood pressure comprising:
- varying a cuff pressure of a cuff on an appendage of a subject and coupled to a controller configured to control the cuff pressure;
- generating a speckleplethysmography signal from a speckleplethysmography sensor on the appendage and coupled to the controller, the speckleplethysmography sensor comprising a coherent light source, configured to illuminate tissue of the subject, and an image sensor configured to receive light from the tissue;
- and
- determining the first blood pressure based on the speckleplethysmography signal and based on the cuff pressure,
- wherein:
- the first blood pressure is a diastolic blood pressure, and
- the determining of the first blood pressure comprises:
- decreasing the cuff pressure;
- and
- determining the cuff pressure at a point in time, while the cuff pressure is decreasing, at which a discrepancy between the speckleplethysmography signal and a template waveform is less than a threshold.
9 more elements
A method, comprising:
- measuring a first blood pressure,
- the measuring of the first blood pressure comprising:
- varying a cuff pressure of a cuff on an appendage of a subject and coupled to a controller configured to control the cuff pressure;
- generating a speckleplethysmography signal from a speckleplethysmography sensor on the appendage and coupled to the controller, the speckleplethysmography sensor comprising a coherent light source, configured to illuminate tissue of the subject, and an image sensor configured to receive light from the tissue;
- and
- determining the first blood pressure based on the speckleplethysmography signal and based on the cuff pressure,
- wherein:
- the first blood pressure is a diastolic blood pressure, and
- the determining of the first blood pressure comprises:
- decreasing the cuff pressure;
- and
- determining the cuff pressure at a point in time, while the cuff pressure is decreasing, at which a low-frequency speckleplethysmography signal ceases to increase.
9 more elements
Dependencies are inferred from the claim text.