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US 12,667,266 B1Granted
Accurate continuous blood pressure measurement device
AssigneeJB HealthTech
InventorsSharon Xiaorong Wang, Jason Andrew Chen, William Barry Chen-Mertens
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Abstract
A continuous blood pressure measurement device includes a cuff airbag pneumatically connected to an inflation/deflation unit and a pressure detection unit. The device also comprises at least one light-emitting diode, at least one photodiode, and a volume detection unit configured to convert photoplethysmogram signals into arterial volume signals. A control unit precisely tracks a predefined setpoint to achieve arterial unloading based on a volume compensation method. An extraction unit reconstructs a high-fidelity arterial blood pressure waveform and accurately determines systolic, diastolic, mean arterial pressures, and heart rate.
Claims18
A continuous blood pressure measurement device for measuring arterial blood pressure, comprising:
- a cuff that is configured to fit on a blood pressure measurement site to compress an artery of the measurement site;
- an inflation/deflation unit that consists of a piezoelectric pump and a valve, to increase and decrease a pressure inside the cuff;
- a pressure detection unit that is configured to detect a cuff pressure, which is the pressure inside the cuff;
- at least one light-emitting diode and at least one photodiode, wherein at least one pair of the light-emitting diode and the photodiode is configured to generate photoplethysmogram;
- a volume detection unit that is configured to detect an arterial volume signal indicating a volume of the artery per unit length;
- a control unit that is configured to set the cuff pressure by controlling the inflation/deflation unit, wherein the control unit comprises a model-based predictive controller to output digital to analog converter (DAC) signals to both pump and valve simultaneously, wherein the model-based predictive controller comprises a system model and a two-degree-of-freedom (2DOF) proportional-integral-derivative (PID) controller, wherein the system model incorporates arterial mechanical properties and cuff plant electromechanical properties, and wherein a global gain adjustment is used to prevent system vibration and improve performance;
- and an extraction unit that is configured to measure volume and blood pressure waveforms to detect systolic with systolic timing, diastolic with diastolic timing, and mean arterial pressure (MAP) of a subject, wherein a bilinear transformation is used for error correction, wherein a volume setpoint corresponds to the cuff pressure below the mean arterial pressure to prevent skin discoloration, wherein the extraction unit is further configured to construct a true blood pressure waveform using a lower cuff pressure to improve subject comfort.
4 more elements
A control method of controlling a continuous blood pressure measurement device for measuring blood pressure, the method comprising:
- providing a cuff that is configured to fit on a blood pressure measurement site to compress an artery of the measurement site;
- increasing and decreasing a pressure inside the cuff using an inflation/deflation unit that consists of a piezoelectric pump and a valve;
- detecting a cuff pressure using a pressure detection unit, which is the pressure inside the cuff;
- generating photoplethysmogram using at least one light-emitting diode and at least one photodiode;
- detecting an arterial volume signal indicating a volume of the artery per unit length using a volume detection unit;
- setting the cuff pressure by controlling the inflation/deflation unit using a control unit, wherein a model-based predictive controller comprises a system model and a 2DOF PID controller, wherein the system model incorporates arterial mechanical properties and cuff plant electromechanical properties, wherein a global gain adjustment is used to prevent system vibration and improve performance;
- and measuring volume waveform and blood pressure waveform to detect systolic with systolic timing, diastolic with diastolic timing, and MAP of a subject using an extraction unit, wherein a bilinear transformation is used for error correction, wherein a volume setpoint corresponds to the cuff pressure below the mean arterial pressure to prevent skin discoloration, wherein the extraction unit is further configured to construct a true blood pressure waveform using a lower cuff pressure to improve subject comfort.
4 more elements
An extraction method of measuring arterial pressures of a subject for a continuous blood pressure measurement device for measuring blood pressure, the method comprising:
- providing a cuff that is configured to fit on a blood pressure measurement site to compress an artery of the measurement site;
- increasing and decreasing a pressure inside the cuff using an inflation/deflation unit that consists of a piezoelectric pump and a valve;
- detecting a cuff pressure using a pressure detection unit, which is the pressure inside the cuff;
- generating photoplethysmogram using at least one light-emitting diode and at least one photodiode;
- detecting an arterial volume signal indicating a volume of the artery per unit length using a volume detection unit;
- setting the cuff pressure by controlling the inflation/deflation unit using a control unit, wherein a model-based predictive controller comprises a system model and a 2DOF PID controller, wherein the system model incorporates arterial mechanical properties and cuff plant electromechanical properties, wherein a global gain adjustment is used to prevent system vibration and improve performance;
- and measuring volume waveform and blood pressure waveform to detect systolic with systolic timing, diastolic with diastolic timing, and MAP of a subject using an extraction unit, wherein a bilinear transformation is used for error correction, wherein a volume setpoint corresponds to the cuff pressure below the mean arterial pressure to prevent skin discoloration, wherein the extraction unit is further configured to construct a true blood pressure waveform using a lower cuff pressure to improve subject comfort.
4 more elements
Dependencies are inferred from the claim text.