Cochlear Implant Electrode Lead Attachment Mechanism
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Solution Overview
Problem
Cochlear implant electrode leads face difficulties in securing and stabilizing within the narrow, porous mastoid bone during insertion and post-insertion due to their small size and the need for precise positioning.
Innovation Solution
An electrode lead with a flexible region and an integrated attachment mechanism that allows bending and securement to the bone, featuring an internal portion within the lead and an external portion that can be bent and secured to the bone, preventing dislodgment from the insertion hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the electrode lead is made small in size for minimally invasive insertion, then the invasiveness is reduced, but the ability to secure and stabilize within the porous mastoid bone deteriorates
Solution Approach 1:
The attachment mechanism is divided into distinct segments: an internal portion positioned within the electrode lead and an external portion extending outward. This segmentation allows the lead to maintain a small overall size for minimally invasive insertion while the external portion provides sufficient surface area and structural features for secure anchoring to the mastoid bone.
Solution Approach 2:
The attachment mechanism utilizes the third dimension by extending from the electrode lead surface into the surrounding tissue space. The external portion projects outward from the lead body, creating a multi-dimensional anchoring structure that engages with the porous bone structure in multiple directions, thereby enhancing securing capability without increasing the lead's primary insertion diameter.
2Ease of operation
If the electrode lead is made flexible to allow bending, then the ease of positioning is improved, but the structural stability for securement deteriorates
Solution Approach 1:
The electrode lead exhibits spatially varying mechanical properties: the main body of the lead maintains flexibility for easy positioning and navigation, while the attachment mechanism region incorporates structurally reinforced portions with enhanced rigidity. This local differentiation allows the lead to be easily positioned during insertion while providing sufficient structural stability at the attachment point for secure bone anchoring.
Solution Approach 2:
The attachment mechanism is designed with dynamic characteristics that allow it to transition from a flexible state during insertion to a stabilized state during securing. The external portion can be manipulated and positioned during surgery, then engages with the bone structure to provide stable anchoring, effectively transitioning from ease-of-positioning mode to structural-stability mode.
3Reliability
If an integrated attachment mechanism is added to the electrode lead, then the securing capability is improved, but the device complexity increases
Solution Approach 1:
The attachment mechanism is integrated directly into the electrode lead structure rather than being a separate component. The internal portion is positioned within and combined with the lead body, eliminating the need for separate attachment devices and reducing overall system complexity while maintaining effective securing capability through the combined structure.
Solution Approach 2:
The attachment mechanism is designed to be self-securing, where the external portion's geometry and material properties enable it to engage with the porous mastoid bone structure without requiring additional fastening components or complex attachment procedures. The structure itself provides the securing function through its design, reducing the need for auxiliary systems.
Data Source
AI summary
An electrode for use with a cochlear implant system includes an electrode array with electrode contacts distributed along the electrode array, and an electrode lead adjacent to the electrode array. The electrode lead has (1) a flexible region configured to allow the electrode lead to bend, (2) an attachment mechanism with an internal portion positioned within and along a longitudinal direction of the electrode lead, and an external portion configured to be bent and secured to bone, the external portion having an attachment element configured to secure the attachment mechanism to the bone, and (3) a securing element extending from the electrode lead and located further back from the flexible region toward a rear end of the electrode lead, the securing element configured to secure the electrode lead to the bone. A method of securing the electrode to bone is also disclosed.