Electrode-Side Current Source Layout for Accurate Bioimpedance
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Solution Overview
Problem
Bioimpedance measurement apparatuses face errors due to current loss and leakage through cables, leading to inaccurate measurements of bioimpedance.
Innovation Solution
A bioimpedance measurement apparatus with a current source integrated into the electrode-side board and the use of shield cables to minimize current and signal loss, featuring a current detection circuit and impedance matching circuits to ensure accurate current application and signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current source is disposed in a separate board connected via cable to the electrode-side board, then the device structure is simplified and easier to manufacture, but current loss and leakage occur through the cable leading to measurement errors
Solution Approach 1:
The patent merges the current source with the electrode-side board into a single integrated unit. This eliminates the cable connection between the current source and electrode board, thereby preventing current loss and leakage that would otherwise occur through the cable. The integration ensures that the current generated by the current source is directly applied to the electrode without passing through intermediate conductive paths that could cause energy loss or measurement errors.
2Reliability
If a cable is used to connect the current source and electrode-side board, then the device modularity is improved and ease of repair is enhanced, but current leakage occurs reducing measurement reliability
Solution Approach 1:
The patent combines the current source and electrode-side board into one integrated module, eliminating the cable interface that generates harmful current leakage. This merger removes the source of electromagnetic interference and signal degradation, thereby improving measurement reliability without requiring additional shielding or isolation components.
3Measurement precision
If the current source is integrated into the electrode-side board, then current loss and leakage are minimized improving measurement accuracy, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent integrates the current source directly onto the electrode-side board, combining multiple functional components into a single module. While this increases the complexity of the electrode-side board itself, it eliminates the need for external cables, connectors, and associated shielding components, thereby reducing overall system complexity. The integration also minimizes current loss and leakage, improving measurement accuracy.
4Loss of information
If shield cable is used to connect electrode-side board and processing board, then signal loss and interference are reduced, but the device complexity and cost increase
Solution Approach 1:
The patent integrates the current source with the electrode-side board, eliminating the need for shield cables to transmit high-frequency current signals. While shield cables may still be used for other signal paths, the critical current path is internalized, removing the requirement for complex cable assemblies and associated connectors, thereby reducing device complexity and cost while minimizing signal loss.
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 allows for accurate bioimpedance measurement by preventing current loss and signal leakage, enhancing the precision of bioimpedance determination.
Implementation Method 1
A bioimpedance measurement apparatus may contact an electrode with a body of a target, may apply predetermined currents through the electrode, and may measure a potential difference between two nodes in a path through which the currents flow
Implementation Method 2
Another aspect also provides a bioimpedance measurement apparatus that may minimize a loss and leakage of a signal when the signal is transferred between an electrode-side board and a board (for example, an analog board), by connecting the electrode-side board and the board via a shield cable
Data Source
AI summary
A bioimpedance measurement apparatus is provided. The bioimpedance measurement apparatus includes an electrode-side board that is configured to be connected to a current electrode in contact with a body and that includes a current source configured to apply a current to the current electrode. The electrode-side board may be connected via a cable to a board in which a processing circuit configured to process a signal acquired through the electrode-side board and/or a frequency signal generator configured to provide a predetermined frequency signal to the electrode-side board are located.