Cochlear Implant Electrode Lead Loop Fixation
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Solution Overview
Problem
Cochlear implant electrode leads often shift post-insertion due to external events, leading to sub-optimal function or loss of function, requiring potential re-surgery for repositioning.
Innovation Solution
The electrode lead is designed with a flexible body and a strand that includes a loop configured to engage with a fixing element, such as a suture or staple, to secure the lead within the cochlea, reducing shifting and facilitating easy identification and selection during insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrode lead is inserted into the cochlea without a fixing mechanism, then the insertion procedure is simpler, but the electrode lead shifts from the inserted position due to external events such as head trauma or sneezing
Solution Approach 1:
A loop is formed on the electrode lead before insertion, and a fixing element is attached to the loop during the insertion procedure. This preliminary preparation allows the fixing element to be positioned and secured to surrounding tissue before the lead is fully implanted, preventing post-insertion shifting without requiring complex additional fixation procedures later
Solution Approach 2:
The loop serves as an intermediary structure between the electrode lead and the fixing element (suture or staple). This intermediate loop configuration enables secure attachment to surrounding tissue while maintaining the simplicity of the insertion procedure, as the loop provides a convenient attachment point that eliminates the need for complex direct fixation methods
2Stability of the object's composition
If a fixing element is attached to the electrode lead, then the position stability is improved, but the device complexity increases
Solution Approach 1:
The fixing mechanism is segmented into separate components: the loop (which can be formed during manufacturing or insertion) and the fixing element (suture or staple attached separately). This segmentation allows the fixing function to be added without fundamentally redesigning the entire electrode lead structure, maintaining relative simplicity while achieving stable fixation
Solution Approach 2:
Instead of attaching the fixing element directly to the lead body, the approach inverts the configuration by forming a loop that protrudes from the lead and attaching the fixing element to this loop. This inversion simplifies the attachment process and reduces structural complexity compared to direct lead fixation methods
3Ease of manufacture
If the electrode lead lacks mechanical reinforcement, then the manufacturing process is simpler, but the likelihood of damage from external trauma increases
Solution Approach 1:
Reinforcing elements are incorporated into the electrode lead structure during the manufacturing process before insertion. This preliminary inclusion of reinforcement features (such as embedded wires or strengthened sections) provides enhanced mechanical strength and trauma resistance without requiring additional manufacturing steps or complex assembly procedures after production
Data Source
AI summary
An exemplary electrode lead includes a flexible body formed of a flexible insulating material, an electrode contact disposed on an outer surface of the flexible body, and a strand that includes a first end portion, a second end portion, and a loop that is provided between the first end portion and the second end portion and that protrudes from the flexible body. The loop is configured to engage with a fixing element that is configured to attach the loop to tissue within a recipient to secure the electrode lead within the recipient. Corresponding methods for manufacturing an electrode lead are also described.