Wearable Arterial Pressure Sensor with Wireless Transceiver
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Solution Overview
Problem
Conventional methods for non-invasively monitoring arterial blood pressure are ineffective in detecting short-term variations and require frequent recalibration, and they cannot replicate the actual blood pressure waveform, limiting their ability to provide continuous and accurate measurements.
Innovation Solution
A heart monitoring system that includes wireless nodes and a wearable appliance with a wireless transceiver, capable of continuously monitoring vital signs such as heart rate, blood pressure, and posture, using accelerometers to detect dangerous conditions and generate warnings, and transmitting data to remote listeners for cardiovascular health assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If occlusive cuff techniques (auscultation or oscillometry) are used to monitor blood pressure, then blood pressure values can be determined intermittently, but continuous monitoring and waveform replication are not achieved
Solution Approach 1:
The patent replaces the mechanical occlusive cuff system with a tonometric sensor that directly contacts the skin over the radial artery. This substitution allows continuous monitoring of the arterial pressure waveform without intermittent cuff inflation/deflation, achieving both continuous duration and waveform fidelity simultaneously
Solution Approach 2:
The patent introduces a tonometric sensor as an intermediary device that indirectly measures arterial pressure by detecting mechanical forces in the tissue overlying the radial artery. This intermediary approach enables continuous waveform monitoring without the need for direct arterial puncture or occlusive cuffs
2Measurement precision
If tonometric sensors are applied against tissue overlying a peripheral artery, then continuous blood pressure waveform can be monitored, but the device is sensitive to placement and requires precise positioning
Solution Approach 1:
The patent divides the sensing function into multiple independent transducers arranged in an array. This segmentation allows the system to detect pressure variations from multiple locations simultaneously, reducing sensitivity to precise placement of any single sensor while maintaining measurement accuracy
Solution Approach 2:
The patent designs a monitoring system that can function effectively across multiple arterial sites (radial, carotid, femoral arteries). The tonometric sensor and processing algorithm are universally applicable to different anatomical locations, eliminating the need for site-specific calibration or complex positioning procedures
3Productivity
If frequent cuff inflation and deflation are performed to obtain intermittent blood pressure readings, then blood pressure values can be updated, but short-term variations cannot be detected
Solution Approach 1:
The patent implements continuous tonometric monitoring that maintains constant contact with the arterial waveform without interruption. This continuous action captures all short-term blood pressure variations including beat-to-beat changes, whereas intermittent cuff methods create gaps in data collection during inflation/deflation cycles
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
The system provides continuous, non-invasive, and accurate monitoring of arterial blood pressure with reduced noise susceptibility and placement insensitivity, enabling real-time, comprehensive patient data collection and early detection of cardiac conditions, while minimizing the effects of white coat syndrome and allowing patients to monitor their health independently.
Implementation Method 1
one or more pressure and ultrasound transducers placed over the radial artery of a human subject's wrist, the latter transmitting and receiving acoustic energy so as to permit the measurement of blood velocity
Implementation Method 2
an accelerometer to detect a dangerous condition and to generate a warning when the dangerous condition is detected
Data Source
AI summary
A monitoring system for a person includes one or more wireless nodes; and a wearable patch or bandage appliance secured to the person' skin and in communication with the one or more wireless nodes, wherein the patch or bandage appliance monitors and transmits patient vital signs to the wireless nodes.