Self-Curling Cochlear Electrode Lead Using Shape Memory Polymer
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Solution Overview
Problem
Current cochlear electrode leads face challenges in precise insertion and limited access to apical spiral ganglion cells due to their design, leading to potential trauma and inferior hearing outcomes, with existing solutions like pre-curved leads requiring specialized tools and nitinol-based self-curling leads being impractical due to rapid curvature issues.
Innovation Solution
The development of self-curling cochlear electrode leads utilizing shape memory polymers that transition from a straightened position to a curved spiral shape upon reaching a specific temperature, allowing for optimal placement near the modiolus and extended access to apical regions without the need for specialized tools or techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If pre-curved cochlear electrode leads are used, then the electrode lead can conform to the cochlea shape, but specialized surgical tools and techniques are required and the insertion depth is limited
Solution Approach 1:
The electrode lead automatically curls into its pre-defined spiral configuration upon insertion into the cochlea without requiring external tools or techniques for shaping. The lead's inherent shape memory properties enable it to self-form the desired curved shape, eliminating the need for specialized surgical tools while achieving proper cochlear conformance
Solution Approach 2:
The electrode lead is pre-configured with a straight configuration that allows easy insertion, then automatically transforms into its curved spiral shape after insertion. This preliminary straight configuration enables simplified insertion procedures while the subsequent automatic transformation achieves the desired cochlear-conforming shape without requiring complex surgical tools
2Extent of automation
If nitinol-based self-curling electrode leads are used, then the electrode lead can curl automatically, but the curling rate is too rapid causing tip foldover or scalar translocation
Solution Approach 1:
The patent changes the material parameter from nitinol alloy to shape memory polymer, fundamentally altering the thermal and mechanical properties. This material substitution enables control over the transition temperature and curling rate, allowing the electrode lead to curl at a controlled, slower pace that prevents tip foldover and scalar translocation while maintaining automatic self-curling capability
Solution Approach 2:
The electrode lead utilizes the phase transition properties of shape memory polymers, which undergo a controlled transition from a rigid to a flexible state at a specific transition temperature. This phase transition enables the lead to curl gradually and controllably after insertion, rather than rapidly as with nitinol, preventing insertion complications while achieving the desired curved configuration
3Ease 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 transitions from a static straight configuration during insertion to a dynamic curved spiral configuration after insertion. This dynamic shape change allows the lead to be simple and straight during the insertion procedure for ease of operation, then automatically transform into a curved shape that positions the electrodes near the modiolus for improved neural activation specificity
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 cochlear electrode leads enable safer, more precise insertion and improved access to low-frequency spiral ganglion cells, reducing the risk of trauma and enhancing hearing outcomes by conforming to the cochlea's curvature and extending further apically than conventional leads.
Implementation Method 1
utilizing shape memory polymers that transition from a straightened position to a curved spiral shape upon reaching a specific temperature
Data Source
AI summary
An exemplary method for manufacturing a self-curling cochlear electrode lead includes forming a shape memory polymer element 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 when a temperature of the shape memory polymer element reaches a transition temperature, placing the shape memory polymer element within a cochlear electrode lead mold, attaching a wire included in a plurality of wires to each electrode contact included in a plurality of electrode contacts, placing the plurality of wires and the plurality of electrode contacts in the cochlear electrode lead mold, and providing the cochlear electrode lead mold with a flexible insulating material such that the shape memory polymer element, the plurality of wires, and the plurality of electrode contacts and embedded within the flexible insulating material after the flexible insulating material solidifies.