Segmented Electrode Leads for Directional Neural Stimulation
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Solution Overview
Problem
Conventional implantable electrical stimulation leads with ring electrodes lack directional control, leading to unwanted stimulation of neighboring neural tissue and potential side effects due to undirected current distribution.
Innovation Solution
The use of segmented electrodes arranged circumferentially on the lead body allows for precise current steering by directing the stimulus current to specific angular ranges, enabling more targeted neural stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ring electrodes are used for stimulation, then the electrode structure is simple and current delivery is reliable, but the stimulus current cannot be directed to specific positions and undirected stimulation occurs
Solution Approach 1:
The ring electrode is divided into multiple segmented electrodes that can be independently controlled. Each segment can deliver current separately, enabling directional stimulation by selecting specific segments. The segments are arranged circumferentially around the lead body, allowing current to be directed to specific angular ranges while maintaining the overall ring structure for structural support and current delivery reliability.
2Manufacturing precision
If segmented electrodes are used for directional stimulation, then current can be directed to specific positions, but the manufacturing process becomes more complex
Solution Approach 1:
The segmented electrodes are pre-assembled into a ring structure before final implantation. This preliminary assembly allows for precise positioning and configuration of the segments in a controlled manufacturing environment, ensuring accurate angular spacing and proper electrical connections. The pre-assembled ring can then be implanted as a unit, simplifying the surgical procedure while maintaining high manufacturing precision for the electrode positions.
Data Source
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AI summary
A method of making an electrical stimulation lead includes attaching segmented electrodes to an interior of a ring in a circumferentially spaced-apart arrangement: attaching a conductor wire to each of the segmented electrodes; coupling the ring with the segmented electrodes to a lead body; and, after coupling to the lead body, removing at least those portions of the ring between the segmented electrodes to separate the plurality of segmented electrodes from each other.