Tip Electrode Retention via Internal Lumen Nesting
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Solution Overview
Problem
Existing implantable electrical stimulation systems face challenges in securely retaining tip electrodes and preventing their rotation, which can affect the precision and durability of electrical stimulation therapies.
Innovation Solution
The design incorporates tip electrodes with internal lumens and lead-retention features such as side apertures or longitudinal grooves, which facilitate secure attachment and prevent undesired rotation on the lead body, enhancing retention and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tip electrodes are attached to the distal tip of the lead body, then electrical stimulation therapy can be delivered, but the electrodes may rotate or become dislodged, affecting precision and durability
Solution Approach 1:
The tip electrode is nested within the lead body through the internal lumen, with the electrode body positioned inside the lead body's internal space. This nesting arrangement allows the electrode to be retained securely while maintaining a relatively simple overall structure.
Solution Approach 2:
The internal lumen provides a three-dimensional retention space within the electrode body, allowing the lead body to be positioned inside the electrode rather than just attached to its surface. This dimensional change enables secure retention without adding external complexity.
2Duration of action of stationary object
If tip electrodes are securely retained on the lead body, then durability is improved, but the complexity of the electrode and lead structure increases
Solution Approach 1:
The lead body is nested within the internal lumen of the electrode body, creating a secure mechanical connection that enhances durability. This nested arrangement provides retention without requiring complex external fastening mechanisms.
Solution Approach 2:
The internal lumen structure of the electrode body serves its own retention function, eliminating the need for separate retention mechanisms. The electrode's own structure provides the means for securing the lead body, simplifying the overall design while improving durability.
Data Source
Figure 1
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Figure 2B
AI summary
An implantable electrical stimulation lead includes a lead body, electrodes disposed along a distal end of the lead body, terminals disposed along the proximal end of the lead body, and conductors coupling the terminals to the electrodes. The electrodes include a tip electrode having an electrode body with an outer stimulating surface. An internal lumen is defined in the electrode body and extends inwardly from an opening in a proximal end of the electrode body. Side apertures are formed between the outer stimulating surface and the internal lumen. A portion of the lead body is disposed within the internal lumen and side apertures through the opening in the proximal end of the electrode body. That portion of the lead body facilitates retention of the tip electrode on a distal tip of the lead body.