Medical Stimulator Electrode Control via Segmented Source Architecture
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Solution Overview
Problem
Existing electrical stimulators often have fewer electrical sources than the number of available electrodes, leading to reduced control over cathode locations and increased side effects, and higher battery consumption due to unnecessary positive electrical sources.
Innovation Solution
Directly connecting negative electrical sources to electrode nodes and using a multiplexer to selectively connect positive electrical sources, allowing for greater control over cathode locations and reducing the number of positive electrical sources, thereby minimizing components and battery consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fewer electrical sources are used than the number of available electrodes, then device complexity is reduced, but control over cathode locations is reduced and side effects increase
Solution Approach 1:
The patent segments the electrical sources into two distinct groups: negative electrical sources that are directly connected to electrode nodes, and positive electrical sources that are selectively connected through a multiplexer. This segmentation allows each group to serve different functional purposes, enabling independent optimization of cathode control and device complexity.
Solution Approach 2:
The negative electrical sources serve a dual function: they provide the therapeutic stimulation current and simultaneously serve as the reference for determining cathode locations. This multi-functionality eliminates the need for separate control mechanisms, reducing device complexity while maintaining reliable control over cathode locations.
2Adaptability or versatility
If more positive electrical sources are included to match the number of electrodes, then control over anode locations is improved, but battery consumption increases
Solution Approach 1:
The patent merges the control of multiple positive electrical sources through a single multiplexer unit, allowing one switching mechanism to manage connections between multiple positive sources and various electrode nodes. This consolidation reduces the overall number of independent control circuits needed, thereby reducing battery consumption while maintaining adaptability.
Solution Approach 2:
The multiplexer operates by periodically switching between different positive electrical sources based on which anode configuration is currently required. This periodic switching allows the system to provide full control over anode locations without requiring all positive sources to be active simultaneously, thus reducing overall power consumption.
3Quantity of substance
If a multiplexer is used to connect electrical sources to electrodes, then the number of electrical sources can be reduced, but the device complexity increases due to the switching unit
Solution Approach 1:
The patent applies asymmetry by treating positive and negative electrical sources differently in terms of their connection architecture. Negative sources are directly connected without switching, while positive sources use a multiplexer. This asymmetric approach optimizes the balance between component count and control capability, reducing overall device complexity.
Data Source
AI summary
This disclosure describes electrical stimulators that include some electrical sources (e.g., current sources, voltage sources) that are directly connected to a plurality of electrode nodes, and other electrical sources that may be selectively connected to selected ones of the plurality of electrode nodes via a switching unit, such as a multiplexer. One example stimulator comprises a processor, a plurality of electrode nodes, and a stimulation generator that is coupled to the processor and to the plurality of electrode nodes. The stimulation generator comprises a plurality of negative electrical sources, a switching unit, and at least one positive electrical source. The negative electrical sources are each directly connected to a different one of the plurality of electrode nodes. The switching unit is connected to each of the plurality of electrode nodes. The at least one positive electrical source is connected to the switching unit. The switching unit is configured to connect the at least one positive electrical source to a selected one or more of the plurality of electrode nodes.