Implantable Electrode Insulation With Selective Ablation Exposure
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Solution Overview
Problem
Implantable medical devices (IMDs) face issues with electrode shorting due to electrical contact with patient tissue and fluids, leading to erroneous measurements and degraded communication signals, and existing methods for applying biocompatible electrical insulators are complex and costly.
Innovation Solution
The IMDs incorporate a biocompatible electrical insulator, such as parylene, which is precisely deposited and then partially removed via ablation to expose electrodes and sensors, improving signal sensing and communication while maintaining device efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a biocompatible electrical insulator is applied to cover the electrode surface, then electrical isolation and signal quality are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The biocompatible electrical insulator is deposited over the entire electrode surface before implantation, and then selectively removed only at the precise locations where electrical contact with tissue is needed. This preliminary application followed by selective removal ensures complete coverage initially, then exposes electrodes only where required, resolving the contradiction between comprehensive electrical isolation and manufacturing complexity
Solution Approach 2:
The insulator material is selectively removed (taken out) from specific regions of the electrode surface after complete coverage is achieved. This extraction approach allows the electrode to be fully protected initially, then precisely exposed only where electrical contact is needed, improving signal quality while maintaining manufacturing feasibility through targeted removal
2Manufacturing precision
If precision removal of the biocompatible electrical insulator is performed, then electrode exposure accuracy is improved, but manufacturing time and cost increase
Solution Approach 1:
Traditional mechanical methods for removing the insulator are replaced with laser ablation technology. The laser precisely removes the biocompatible electrical insulator material from the electrode surface without mechanical contact, achieving high electrode exposure accuracy while reducing manufacturing time and avoiding contamination from mechanical tools
Solution Approach 2:
The removal process utilizes controlled laser parameters (energy density, pulse duration, wavelength) to precisely ablate the insulator material at specific locations. By adjusting these parameters, the system achieves accurate electrode exposure while optimizing processing speed, resolving the contradiction between precision and manufacturing time
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
This approach enhances physiological parameter monitoring, communication reliability, and reduces manufacturing complexity and cost by ensuring precise electrical isolation and surface texture for improved electrode performance.
Implementation Method 1
ablating a portion of the biocompatible electrical insulator
Data Source
AI summary
An example method of manufacturing an implantable medical device includes disposing a biocompatible electrical insulator on an outer surface of a housing of the implantable medical device and to cover an outer surface of an electrode that is positioned on the outer surface of the housing, ablating a portion of the biocompatible electrical insulator, and removing the biocompatible electrical insulator to expose the outer surface of the electrode.