Automated Cochlear Electrode Insertion with Force Control
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Solution Overview
Problem
The insertion of cochlear electrodes into the cochlea during cochlear implantation can cause mechanical damage to sensitive tissues, leading to trauma and potential loss of residual hearing, as manual insertion techniques often exceed the mechanical limits of the inner ear tissues, even if forces are below tactile detection thresholds.
Innovation Solution
An automated insertion tool with force sensors and micromanipulators is used to precisely control the insertion of the electrode array, measuring and limiting forces to sub-micronewton levels, and providing real-time feedback to prevent excessive force application, thereby minimizing tissue damage and preserving residual hearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual insertion technique is used, then insertion speed and simplicity are improved, but tissue damage and trauma increase
Solution Approach 1:
The patent replaces manual mechanical insertion with an automated robotic system that uses controlled mechanical forces. The robotic insertion device substitutes human hand operations with programmable mechanical actuators that can precisely control insertion forces, speeds, and trajectories, thereby maintaining productivity while eliminating the harmful variability and excessive forces associated with manual insertion.
Solution Approach 2:
The patent implements real-time feedback mechanisms through force sensors that continuously monitor the forces applied during electrode insertion. This feedback loop allows the system to detect tissue resistance and adjust insertion parameters dynamically, preventing excessive forces that cause trauma while maintaining efficient insertion progress. The feedback system enables closed-loop control of the insertion process.
2Device complexity
If manual insertion is performed, then device complexity is reduced, but measurement precision of insertion forces deteriorates
Solution Approach 1:
The patent replaces simple manual insertion tools with an automated robotic system equipped with integrated force sensors and control electronics. This substitution introduces complexity in the device but enables precise measurement of insertion forces at the sub-micronewton level, which is impossible with manual techniques. The measured forces are then used to control the insertion process with high precision.
3Object-affected harmful factors
If automated insertion with force control is implemented, then tissue trauma is reduced, but device complexity and operational complexity increase
Solution Approach 1:
The patent introduces a robotic insertion device as an intermediary between the surgeon's intent and the actual electrode insertion into the cochlea. This intermediary system incorporates force sensors, actuators, and control algorithms that mediate the insertion process, translating surgical goals into precise, controlled actions that minimize tissue trauma while managing the complexity of force-controlled insertion.
4Reliability
If force limits are strictly enforced during insertion, then hearing preservation is improved, but insertion difficulty and time increase
Solution Approach 1:
The patent enables continuous electrode insertion by maintaining forces within safe limits throughout the entire insertion process. The automated system continuously adjusts insertion speed and force application to stay within tissue tolerance thresholds, eliminating the need to stop and reassess. This continuous controlled action preserves hearing while maintaining efficient insertion progress without unnecessary interruptions.
Solution Approach 2:
The patent employs dynamic control of insertion parameters, where force limits and insertion speeds are adjusted in real-time based on tissue response and depth. The system transitions smoothly between different insertion phases, adapting forces to match the mechanical properties of tissues at different locations within the cochlea, thereby optimizing both hearing preservation and insertion efficiency.
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 automated system ensures atraumatic insertion of cochlear electrodes by accurately managing insertion forces, reducing tissue damage and maintaining or improving residual hearing, as evidenced by reduced trauma and better long-term performance of the cochlear implant.
Implementation Method 1
measuring and limiting forces to sub-micronewton levels
Data Source
AI summary
A system for mechanically assisted insertion of an electrode includes: an insertion tool configured to insert the electrode into biological tissues; and a controller configured to control the insertion tool, in which the controller is further configured to select operating parameters comprising a maximum allowable force profile from a library of operating parameters, in which the maximum allowable force profile is generated from data recorded during a number of previous successful operations. Also, a method for insertion of a cochlear lead, includes: selecting operating parameters comprising a maximum allowable force profile from a library of operating parameters; inserting the cochlear lead while sensing real time force and position; and continuing the insertion while the real time force is below the maximum allowable force profile, in which the maximum allowable force profile is generated from data recorded during a number of previous successful operations.