Non-Circular Brain Stimulation Lead Geometry for Precise Targeting
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Solution Overview
Problem
Current deep brain stimulation systems face challenges in precisely locating and stimulating target neurons due to the difficulty in positioning leads with circular transverse cross-sectional shapes, which often result in unintended stimulation of non-target structures, leading to potential negative effects on patients.
Innovation Solution
The development of brain stimulation leads with non-circular transverse cross-sectional shapes that allow for precise alignment and stimulation of discrete regions, using rotatable styles and electrodes strategically positioned on the lead to limit stimulation to specific areas, thereby reducing unwanted stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a lead with a circular transverse cross-sectional shape is used, then the lead is easier to manufacture and insert, but the stimulation precision and ability to limit stimulation to discrete regions deteriorates
Solution Approach 1:
The patent applies asymmetry by changing the lead's distal end from a conventional circular cross-section to a non-circular shape (such as D-shaped, triangular, or rectangular). This asymmetric geometry enables the electrodes to be positioned at specific orientations relative to anatomical structures, allowing precise targeting of discrete brain regions while limiting stimulation to intended areas only. The asymmetric shape acts as a mechanical guide that ensures proper alignment during insertion.
2Measurement precision
If multiple insertions of recording and stimulating leads occur to properly position the stimulating electrode, then the positioning precision may improve, but the procedure complexity and patient risk increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the lead's distal end with a specific non-circular geometry before insertion. This pre-designed shape serves as a mechanical template that automatically guides the lead to the correct orientation and position upon insertion, eliminating the need for multiple trial insertions and adjustments. The shape is predetermined to match the anatomical target, ensuring accurate positioning in a single procedure.
3Reliability
If electrodes are positioned to stimulate target neurons, then the therapeutic effect improves, but unintended stimulation of non-target structures may occur causing adverse effects
Solution Approach 1:
The patent applies local quality by designing the non-circular distal end shape to concentrate electrode positioning precision at the specific location where stimulation is needed. The geometric features (such as flat surfaces, corners, or asymmetric contours) create distinct orientation references that ensure electrodes contact only the intended target structures. This localized geometric control prevents current spread to adjacent non-target areas, eliminating harmful side effects while maintaining therapeutic effectiveness.
Data Source
AI summary
A lead is configured and arranged for brain stimulation. The lead includes a proximal end and a distal end. The proximal end includes a plurality of terminals disposed at the proximal end. The distal end has a non-circular transverse cross-sectional shape and includes a plurality of electrodes disposed at the distal end. A plurality of conductive wires electrically couple at least one of the plurality of electrodes to at least one of the plurality of terminals.