Torso Accelerometer Sensors for Non-Invasive Cardiac Force Monitoring
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Solution Overview
Problem
Current methods for monitoring cardiovascular activity, particularly arterial blood pressure and cardiac mechanical forces, are limited by the need for invasive devices, difficulty in detecting early-stage heart failure, and challenges in accurately tracking systemic blood pressure dynamics, especially at night, due to disruptions caused by traditional cuff-based monitors and the confounding effects of peripheral vascular activity.
Innovation Solution
The development of modular, wearable sensors using accelerometers and other physiological sensors positioned on the torso and body surface to measure cardiac forces, blood pressure, and respiratory activity, enabling accurate evaluation and tracking of cardiovascular activity, including the use of MEMS technology and flexible, conformal sensor designs for non-invasive, cuff-free monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional cuff-based monitors are used to track blood pressure, then blood pressure measurement is achieved, but sleep is disrupted and monitoring accuracy is compromised during nighttime
Solution Approach 1:
The patent replaces the mechanical cuff-based blood pressure monitoring system with an accelerometer-based system that detects cardiac forces and arterial pressure waves through body surface acceleration. This substitution eliminates the need for cuff inflation/deflation cycles that disrupt sleep, while maintaining the ability to accurately track blood pressure dynamics through the analysis of mechanical vibrations and wave propagation patterns.
Solution Approach 2:
The patent introduces acceleration as an intermediary parameter to indirectly measure blood pressure. Instead of directly measuring pressure with a cuff, the system uses accelerometers to detect the mechanical effects of cardiac contraction and arterial pressure waves on the body surface, then processes these acceleration signals to derive blood pressure information. This intermediary approach enables continuous, non-intrusive monitoring without sleep disruption.
2Ease of operation
If peripheral vascular sensors are used to track blood pressure, then non-invasive monitoring is achieved, but measurement accuracy is reduced due to confounding peripheral vascular activity
Solution Approach 1:
The patent segments the body surface into multiple sensor locations (torso, abdomen, limbs, neck, head) and places accelerometers at these distinct positions. By measuring acceleration at multiple segmented locations simultaneously, the system can differentiate between central cardiovascular signals and peripheral vascular artifacts, enabling accurate systemic blood pressure tracking while maintaining non-invasive monitoring.
Solution Approach 2:
The patent adds spatial dimensionality by deploying accelerometers at multiple body locations rather than relying on a single peripheral site. This multi-dimensional approach allows the system to analyze the propagation characteristics of pressure waves across different body regions, separating central arterial pressure signals from peripheral vascular confounders and improving measurement accuracy.
3Device complexity
If a single sensor position is used for ballistocardiography, then device simplicity is maintained, but detection of regional cardiac dyssynchrony and early heart failure is limited
Solution Approach 1:
The patent divides the monitoring system into multiple sensor units positioned at different body locations (torso, abdomen, limbs, neck, head). Each sensor independently measures local acceleration, and the combined data enables detection of regional cardiac dyssynchrony and early heart failure signs that would be invisible to a single sensor. This segmentation maintains relative device simplicity while dramatically improving diagnostic precision.
Solution Approach 2:
The patent makes the sensor system multi-functional by using the same accelerometer-based platform to detect multiple cardiovascular parameters simultaneously: cardiac mechanical forces, arterial pressure waves, respiratory activity, and signs of heart failure. This universal approach allows a single sensor type at multiple locations to serve multiple diagnostic purposes, improving evaluation accuracy without proportionally increasing device complexity.
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 solution provides a practical and non-disruptive means to monitor cardiovascular activity, enabling more accurate evaluation of cardiac mechanical forces, synchronicity, and blood pressure dynamics, facilitating early detection of heart failure and improved management of cardiovascular conditions, including guidance for resynchronization pacing therapy.
Implementation Method 1
accelerometer-containing sensors positioned on the body surface, including the torso, abdomen, limbs, neck, and head... measure the dynamical patterns of pressure waves in those peripheral vessels
Implementation Method 2
The development of modular, wearable sensors using accelerometers and other physiological sensors positioned on the torso and body surface to measure cardiac forces... including the use of MEMS technology
Data Source
AI summary
Modular, miniaturized cardiovascular sensors, systems, methods, and wearable devices for the non-obtrusive evaluation, monitoring, and high-fidelity mapping of cardiac mechanical and electromechanical forces and central arterial blood pressure are presented herein. The sensor manufacturing process is also presented. Using accelerometers, the sensors register body-surface (preferably torso-surface) movements and vibrations generated by cardiac forces. The sensors may contain single-use or reusable components, which may be exchanged to fit different body sizes, shapes, and anatomical locations; they may be incorporated into clothing, bands, straps, and other wearable arrangements. The invention presents a practical, noninvasive solution for electromechanical mapping of the heart, which is useful for a wide range of healthcare applications, including the remote monitoring of heart failure status and the guidance of cardiac resynchronization therapy. Exercise and cardiovascular fitness tracking applications are also presented.