Blood Pressure Model Augmented by Activity Data
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Solution Overview
Problem
Existing devices for continuous, non-invasive blood pressure monitoring face challenges in achieving accurate measurements due to insufficient information from single sensing modalities, such as photoacoustic sensors or optical sensors.
Innovation Solution
The system incorporates a control system that obtains activity information from the user, updates a blood pressure model based on this information, and uses a light source system and receiver system to detect acoustic waves corresponding to photoacoustic responses from blood vessels, thereby estimating blood pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single sensing modalities (photoacoustic sensors or optical sensors) are used for continuous non-invasive blood pressure monitoring, then the device complexity is reduced, but the measurement precision deteriorates due to insufficient information
Solution Approach 1:
The patent combines multiple sensing modalities including photoacoustic sensors, optical sensors, and activity sensors into an integrated monitoring system. This merging of different sensing approaches allows the system to capture comprehensive physiological information while maintaining continuous non-invasive monitoring capabilities, thereby resolving the contradiction between device simplicity and measurement accuracy
Solution Approach 2:
The monitoring device is designed with multi-functional sensing capabilities that can perform various measurements (blood pressure, heart rate, activity tracking) using a single integrated system. This universal approach allows the device to gather diverse physiological data without requiring multiple separate devices, thus improving measurement precision while controlling device complexity
2Measurement precision
If activity information is integrated into the blood pressure estimation process, then the measurement precision is improved, but the device complexity increases due to additional sensors and processing requirements
Solution Approach 1:
The patent introduces activity information as an intermediary element that bridges the gap between basic sensor measurements and accurate blood pressure estimation. By incorporating activity data from motion sensors and using it to adjust and refine the blood pressure model, the system achieves higher measurement precision without requiring fundamentally new sensing technologies, thus managing device complexity while improving accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of blood pressure measurements by integrating activity information into the estimation process, providing more precise and reliable non-invasive monitoring.
Implementation Method 1
a receiver system configured to detect an acoustic wave corresponding to a photoacoustic response of a blood vessel of the apparatus user to light emitted by the light source system
Data Source
AI summary
In some implementations, an apparatus may obtain activity information indicative of an activity performed by a person. The apparatus may update a model for determining blood pressure of the person based at least in part on the obtained activity information. The apparatus may detect an acoustic wave corresponding to a photoacoustic response of a blood vessel of the person to light emitted by a light source system. The apparatus may estimate a blood pressure based at least in part on the updated model and the acoustic wave. In some embodiments, the apparatus may comprise a wearable device worn by the person.