Bioimpedance Device Insulating Separating Web for Electrode Positioning
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Solution Overview
Problem
Existing bioimpedance measuring devices face challenges in achieving reproducible and precise impedance measurements due to variable electrode positioning, particularly with the thumb, leading to inconsistent results.
Innovation Solution
The design incorporates an electrically insulating separating web on the hand-rest surface between the middle and ring fingers, ensuring electrodes contact specific fingers, preventing short circuits and allowing for consistent anatomical positioning of the hand, thereby decoupling the current and voltage measurement paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thumb is used for electrode contact to decouple current and voltage paths, then decoupling is achieved to a certain extent, but measurement reproducibility deteriorates due to thumb mobility causing varying connection points
Solution Approach 1:
The hand-rest body is segmented into distinct contact zones for different fingers, with the separating web dividing the contact surface. This forces the user to distribute contact across multiple fixed finger positions (index, middle, ring, little fingers) rather than relying on the mobile thumb, thereby segmenting the contact function across stable anatomical landmarks.
Solution Approach 2:
The separating web acts as an intermediary element that physically guides finger placement and electrically isolates adjacent contact points. It serves as a mediator between the user's hand and the electrodes, ensuring that contact is made at predetermined locations on stable fingers rather than the mobile thumb.
2Reliability
If electrodes are placed on the palm and thumb, then current path and voltage measurement path are decoupled, but electrode positioning consistency deteriorates due to variable thumb position
Solution Approach 1:
The separating web is pre-positioned on the hand-rest body to define specific contact zones before the user makes contact. This preliminary structural arrangement guides the user's fingers to predetermined locations, ensuring consistent electrode contact positions across different measurements without requiring manual adjustment.
3Ease of operation
If a cylindrical hand-rest body is used for hand contact, then ease of operation is improved, but measurement precision deteriorates due to lack of defined electrode contact positions
Solution Approach 1:
While the overall hand-rest body maintains a comfortable cylindrical shape for general hand placement, the separating web introduces localized structural variation that creates distinct contact zones. This local modification provides defined electrode contact positions specifically where needed, without compromising the overall ergonomic design.
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 configuration ensures better reproducibility and accuracy of impedance measurements by maintaining consistent electrode contact and avoiding mutual interference between the current and voltage paths.
Implementation Method 1
Each palm rest is provided with an electrically insulating separator extending part way along its length
Implementation Method 2
to determine the impedance of body segments from this
Data Source
AI summary
The bio-impedance measuring device has multiple electrodes and measuring circuits inclusive of alternating current sources. A hand rest surface (1) is provided with an electrically isolated separation bar (2). The separation bar is extended over a partial length.