Physiology Signal Sensing Device Using Elastic Pad and Strain Sensor
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Solution Overview
Problem
Conventional blood pressure monitors are either uncomfortable and difficult to carry due to their size and weight, or they are expensive and provide inaccurate readings due to unstable piezoelectric sensors.
Innovation Solution
A physiology signal sensing device featuring an elastic pad with a strain sensor element and a conductive element that deforms with blood vessel vibrations, generating accurate signals without a pumping cuff, allowing for long-term use and easy portability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical pumping cuffs are used for blood pressure monitoring, then the device can provide blood pressure readings, but the device becomes large in size and heavy in weight, making it difficult to carry
Solution Approach 1:
The patent replaces the mechanical pumping cuff system with an electronic sensing system that uses piezoelectric sensors to detect blood vessel vibrations. This substitution eliminates the need for mechanical inflation and deflation mechanisms, dramatically reducing device weight and size while maintaining blood pressure measurement capability through vibration frequency analysis
Solution Approach 2:
The patent extracts and removes the bulky pumping cuff mechanism from the blood pressure monitoring device, retaining only the essential sensing function through miniaturized piezoelectric sensors that can be integrated into lightweight wearable form factors
2Measurement precision
If mechanical pumping cuffs are used for blood pressure monitoring, then the device can provide blood pressure readings, but the device becomes large in size, making it difficult to carry
Solution Approach 1:
The patent replaces the mechanical pumping cuff system with an electronic sensing system that uses piezoelectric sensors to detect blood vessel vibrations. This substitution eliminates the need for mechanical inflation and deflation mechanisms, dramatically reducing device weight and size while maintaining blood pressure measurement capability through vibration frequency analysis
Solution Approach 2:
The patent extracts and removes the bulky pumping cuff mechanism from the blood pressure monitoring device, retaining only the essential sensing function through miniaturized piezoelectric sensors that can be integrated into lightweight wearable form factors
3Volume of moving object
If piezoelectric sensors are used for detecting blood pressure, then the device size is reduced, but the current generated by the sensor is unstable, resulting in inaccurate blood pressure detection
Solution Approach 1:
The patent implements feedback mechanisms through signal processing circuits that continuously monitor and adjust for variations in piezoelectric sensor output. The system uses reference signals and comparison circuits to compensate for instability, ensuring accurate blood pressure readings despite fluctuations in the raw sensor current
Solution Approach 2:
The patent introduces intermediary signal processing components between the piezoelectric sensor and the final measurement output. These intermediaries include amplification circuits, filtering stages, and calibration mechanisms that stabilize the sensor signal and eliminate instability before it affects measurement accuracy
4Duration of action of moving object
If piezoelectric sensors are used for detecting heart rate, then the device can be used continuously for long time, but the cost of the sensor is high
Solution Approach 1:
The patent designs the piezoelectric sensor system to perform multiple functions: detecting both blood pressure through vibration frequency analysis and heart rate through vibration amplitude analysis. This multi-functionality justifies the sensor cost by eliminating the need for separate sensors, enabling continuous monitoring of multiple physiological parameters with a single device
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 device provides accurate detection of physiology signals, reduces manufacturing costs, and is compact and lightweight, enabling continuous use and easy carrying.
Implementation Method 1
the conductive element deforms according to a vibration of the blood vessel, and the resistance value of the conductive element varies according to the strain of the conductive element
Implementation Method 2
the resistance value of the conductive element varies according to the strain of the conductive element
Implementation Method 3
an elastic pad and a strain sensor element. The elastic pad is for contact with a human body and corresponds to a blood vessel of the human body
Data Source
AI summary
A physiology signal sensing device includes an elastic pad and a strain sensor element. The elastic pad is used for contact with a human body, and corresponds a blood vessel of the human body. The strain sensor element is disposed in the elastic pad and includes a conductive element. The conductive element deforms according to the vibration of the blood vessel, and the resistance value of the conductive element varies according to the strain of the conductive element.