Cuffless Arterial Accelerometer for Hemodynamic Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hemodynamic monitoring technologies are obtrusive and invasive, lacking accuracy and convenience, particularly in wearable forms that rely on cuffs or multiple sensors, which deter frequent blood pressure measurements and lead to adverse outcomes due to undermonitoring of cardiovascular conditions.
Innovation Solution
A novel method using a single accelerometer in direct contact with blood vessels to measure arterial acceleration, translating it into pressure waves without a cuff, enabling continuous, accurate monitoring of hemodynamic features like blood pressure and heart rate through integration with various surfaces and devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cuff-based systems are used to ensure equal transmural pressure, then measurement accuracy is improved, but device obtrusiveness increases and user compliance decreases
Solution Approach 1:
The invention extracts the essential measurement function from the traditional cuff-based system by using a pressure sensor that directly contacts the blood vessel at a single point, eliminating the need for an inflatable cuff while maintaining measurement accuracy through direct arterial pressure detection
Solution Approach 2:
The patent introduces a flexible membrane as an intermediary between the pressure sensor and the blood vessel, allowing direct pressure transmission from the artery to the sensor while providing a comfortable, cuff-less interface that maintains user compliance
2Measurement precision
If multiple sensors are used for pulse wave velocity-based blood pressure estimation, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The invention extracts the blood pressure measurement function from complex multi-sensor pulse wave velocity systems by using a single pressure sensor that directly measures arterial pressure, eliminating the need for ECG, PPG, or other auxiliary sensors
Solution Approach 2:
The patent enables the pressure sensor to directly measure blood pressure through self-contact with the blood vessel, eliminating the need for external calibration signals or multiple sensor synchronizations required by PWV-based methods
3Duration of action of moving object
If wearable sensors are used for continuous monitoring, then monitoring capability is improved, but obtrusiveness increases
Solution Approach 1:
The invention extracts the monitoring function from obtrusive wearable devices by creating a minimal-contact system where a small pressure sensor directly contacts the blood vessel, enabling continuous monitoring without the bulk and discomfort of traditional wearables
Solution Approach 2:
The patent uses a flexible membrane to encapsulate the pressure sensor, creating a thin, conformable interface that can be comfortably worn or applied to the skin while maintaining continuous contact with the blood vessel for uninterrupted monitoring
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 provides highly accurate, cuff-less monitoring of hemodynamic parameters with high user compliance, achieving 91% accuracy comparable to gold standards, and can be seamlessly integrated into daily life and clinical settings.
Implementation Method 1
an accelerometer in direct contact with the blood vessel to pick up arterial acceleration caused by the blood
Implementation Method 2
This acceleration is then translated to a pressure wave using Newton's law
Data Source
AI summary
A sensor for blood-based measurement parameters that can be integrated on any flat surface to allow for ubiquitous monitoring of hemodynamics is disclosed. Such a sensor can measure heart rate, heart rate variability, blood pressure, etc. The sensor is adapted to be placed in direct contact with blood vessels. This can be done with an accelerometer or another type of vibrational or acoustic sensor in order to measure arterial vibrations.