Compressible Sensor Mounting for Bioelectrical Signal Stability
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Solution Overview
Problem
Conventional bioelectrical signal measurement systems, such as capacitive ECG systems, face challenges in maintaining signal quality due to movement-related pressure changes and tribological disturbances, which affect the impedance between the patient and the sensor, leading to poor signal quality.
Innovation Solution
A differential voltage measuring system with a mechanical mounting that includes a compressible foam supporting structure and a harder frame structure, where the supporting structure is configured to compress to a constant height, decoupling the compressive force and minimizing capacitance changes, thereby reducing triboelectric effects and maintaining signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is firmly attached to the patient body to maintain contact pressure, then the signal quality improves, but movement-related pressure changes and tribological disturbances increase
Solution Approach 1:
The mounting structure is divided into two functional segments: a compressible supporting structure (foam material) that absorbs movement-related pressure changes, and a rigid frame structure that maintains stable sensor positioning. This segmentation allows each part to perform its specific function independently, resolving the contradiction between maintaining contact pressure and preventing movement disturbances.
Solution Approach 2:
Different parts of the mounting structure have different mechanical properties tailored to their specific functions: the supporting structure uses soft, compressible foam material to accommodate local pressure variations from patient movement, while the frame structure uses rigid material to provide stable local support for the sensor. This local differentiation of material properties resolves the contradiction by allowing each region to optimize for its specific requirement.
2Object-affected harmful factors
If a compressible supporting structure is used to absorb pressure changes, then movement-related disturbances are reduced, but the structural stability decreases
Solution Approach 1:
The mounting structure combines two fundamentally different materials: a compressible foam supporting structure and a rigid frame structure. This composite construction allows the foam to absorb compression forces from patient movement while the rigid frame maintains overall structural stability and sensor positioning. The combination resolves the contradiction by allowing each material to perform its strength.
Solution Approach 2:
The rigid frame structure acts as an intermediary between the compressible foam supporting structure and the sensor. It transfers the stabilizing function from the rigid frame to the sensor, while allowing the foam to perform its pressure-absorbing function. This intermediary element resolves the contradiction by decoupling the stability function from the compression function.
3Measurement precision
If the coupling area between sensor and patient is increased to achieve high capacitance, then the signal amplitude increases, but the device complexity increases
Solution Approach 1:
The mounting structure performs multiple functions simultaneously: it provides mechanical support for the sensor, absorbs movement-related pressure changes, maintains stable contact pressure, and ensures proper sensor positioning. By integrating these multiple functions into a single unified structure, the design achieves high signal amplitude through stable coupling without requiring additional separate components, thus resolving the contradiction between signal quality and 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
The solution effectively minimizes movement-related pressure changes and disturbances, ensuring high signal quality by maintaining a constant counterforce and reducing capacitance changes, even with patient movement, thus stabilizing the bioelectrical signal measurement.
Implementation Method 1
the mechanical mounting is at least partially compressible and comprises a frame structure and a supporting structure... the supporting structure is configured higher than the frame structure
Implementation Method 2
Triboelectric effects can occur in the clothing and possible other layers between the sensor and the patient and within the sensor itself. These significantly impair the signal quality.
Data Source
AI summary
At least one example embodiment relates to a measuring system for measuring bioelectrical signals of a patient, the measuring system comprising a sensor electrode, and a mechanical mounting for the sensor electrode, the mechanical mounting being at least partially compressible and comprising a frame structure and a supporting structure. The mechanical mounting is fastened to a substrate of the measuring system and supports the sensor electrode against the substrate, the supporting structure is arranged beneath the sensor electrode, the frame structure at least partially surrounds the supporting structure, and the supporting structure is configured higher than the frame structure.