Self-Curling Cochlear Electrode Lead for Atraumatic Spiral Insertion
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Solution Overview
Problem
Current cochlear electrode leads face challenges such as improper insertion, potential trauma to the cochlea, limited access to apical spiral ganglion cells, and require specialized surgical techniques due to their design and material properties, leading to suboptimal hearing outcomes.
Innovation Solution
The development of self-curling cochlear electrode leads using shape memory polymers that transition from a straightened position to a curved spiral shape upon exposure to a transition agent, allowing for controlled curling within the cochlea to conform to its structure, minimizing trauma and enhancing access to low-frequency spiral ganglion cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If pre-curved cochlear electrode leads are used, then the electrode lead conforms to the helical shape of the cochlea, but specialized surgical tools and techniques are required and the insertion depth is limited
Solution Approach 1:
The electrode lead is pre-formed with a curled shape that matches the cochlear anatomy, but this curl is activated only after insertion through a stylet. The stylet maintains the lead in a straight configuration during insertion, then is withdrawn to allow the pre-formed curl to activate, eliminating the need for specialized curling tools while achieving proper anatomical conformance
Solution Approach 2:
A stylet serves as an intermediary tool that temporarily maintains the electrode lead in a straight configuration during insertion. The stylet is inserted through the lead's lumen to prevent premature curling, then gradually withdrawn to allow controlled activation of the curled shape, simplifying the surgical procedure while ensuring proper deployment
2Extent of automation
If nitinol-based self-curling electrode leads are used, then the electrode lead curls upon reaching transition temperature, but the rate of modulus change is too fast causing tip foldover or scalar translocation
Solution Approach 1:
The patent changes the material parameter from nitinol (metallic shape memory alloy) to shape memory polymer, which exhibits a slower and more controllable modulus transition. This parameter change allows the electrode lead to self-curl at an optimized rate that prevents tip foldover and scalar translocation while maintaining the benefits of automated curling
Solution Approach 2:
The patent utilizes the phase transition properties of shape memory polymers, which undergo a gradual solid-to-rubbery transition at their transition temperature. This phase transition occurs more slowly than nitinol's modulus change, allowing controlled self-curling that prevents surgical complications while achieving proper cochlear conformance
3Extent of automation
If nitinol-based self-curling electrode leads are used, then the electrode lead curls upon heating, but premature curling may occur under hot operating room lights
Solution Approach 1:
The patent changes the transition temperature parameter of the shape memory polymer to be significantly higher than operating room light temperatures (typically above 40°C). This parameter adjustment ensures that the electrode lead will not curl prematurely under surgical lighting, while still enabling controlled self-curling when exposed to body temperature or controlled heating after insertion
4Ease of operation
If straight cochlear electrode leads are used, then the insertion procedure is simpler, but the electrode lead resides far from the modiolus resulting in lower neural activation specificity
Solution Approach 1:
The electrode lead is pre-formed with a curled shape that is activated after insertion to naturally guide the lead toward the modiolus. This preliminary configuration maintains insertion simplicity while achieving precise anatomical positioning, as the pre-formed curl activates to pull the electrode contacts closer to the modiolus without requiring complex insertion maneuvers
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The self-curling electrode leads facilitate easier insertion without specialized tools, reduce trauma risk, and provide improved access to critical auditory regions, thereby enhancing hearing outcomes and compatibility with robotic surgery.
Implementation Method 1
a shape memory polymer element that is embedded within the flexible body and that is configured to cause the cochlear electrode lead to transition to a curved spiral shape so as to conform with a curvature of the human cochlea in response the shape memory polymer element being subjected to a transition agent
Implementation Method 2
a plurality of transition agent vias configured to transmit the transition agent through the flexible insulating material to the shape memory polymer element
Data Source
AI summary
An exemplary self-curling cochlear electrode lead adapted for insertion into a human cochlea, comprises: a flexible body formed of a flexible insulating material; a shape memory polymer element that is embedded within the flexible body and that is configured to cause the self-curling cochlear electrode lead to transition to a curved spiral shape so as to conform with a curvature of the human cochlea in response the shape memory polymer element being subjected to a transition agent. The flexible body may include a plurality of transition agent vias configured to transmit the transition agent through the flexible body to the shape memory polymer element.