Digital Pressure Sensor with Rubber Cover and ADC
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Solution Overview
Problem
Current medical pressure sensors output dynamic waveforms of pressure variations as electrical signals, making it inconvenient for operators to obtain real-time blood pressure readings, and the manufacturing process is complicated due to the use of screen-printed thick film resistors.
Innovation Solution
A digital pressure sensor comprising a substrate, pressure sensing structure, signal processing chip with analog-digital conversion, and a rubber cover with a mounting cavity, which converts sensing signals into digital signals for real-time display and simplifies production by eliminating the need for screen-printed resistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If screen-printed thick film resistors are used to compensate bridge resistance, then manufacturing precision is improved, but device complexity and manufacturing time increase
Solution Approach 1:
The patent removes the screen-printed thick film resistor component entirely from the manufacturing process. Instead of adding a separate compensation element, the bridge resistance compensation is integrated directly into the main orifice plate structure through laser cutting and forming, thereby simplifying the device structure and manufacturing process while maintaining precision.
Solution Approach 2:
The patent combines the bridge resistance compensation function with the main orifice plate structure. The compensation is achieved by laser-cutting specific patterns directly into the orifice plate itself, merging two previously separate functions (pressure sensing and resistance compensation) into a single integrated component, thus reducing device complexity.
2Measurement precision
If electrical signals are output for pressure variations, then measurement precision is maintained, but ease of operation deteriorates due to inability to directly observe real-time blood pressure
Solution Approach 1:
The patent introduces a display device as an intermediary between the pressure sensor and the operator. The sensor continues to measure pressure accurately with high precision, while the display device converts the electrical signals into visually accessible blood pressure readings and waveforms, enabling real-time observation without compromising measurement accuracy.
Solution Approach 2:
The patent replaces the need for direct mechanical observation or manual measurement with an electronic display system. The electrical signals from the pressure sensor are processed and presented through visual display, substituting mechanical reading methods with electronic visualization, thereby improving ease of operation while preserving measurement precision.
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
Enables real-time monitoring of blood pressure and body temperature, reduces manufacturing complexity, and enhances detection accuracy with alarm functions and temperature detection, improving operational convenience and patient safety.
Implementation Method 1
Since fluid can transfer pressure, the pressure in the blood vessel is transferred to the external pressure sensor through the liquid in the catheter
Implementation Method 2
The signal processing chip has an analog-digital conversion module that converts the sensing signal output by the pressure sensing structure into a digital signal
Data Source
AI summary
A digital pressure sensor includes a substrate, a pressure sensing structure configured for measuring a pressure of an object to be measured, a signal processing chip configured for receiving a sensing signal of the pressure sensing structure, and a rubber cover having an opening through which the pressure is sensed. The pressure sensing structure and the signal processing chip are mounted on the substrate. The signal processing chip has an analog-digital conversion module that converts the sensing signal output by the pressure sensing structure into a digital signal and outputs the digital signal. The signal processing chip is electrically connected to the substrate. The substrate and the rubber cover are connected to each other and form a mounting cavity for holding the pressure sensing structure and the signal processing chip.