Implantable Electrode Coating for Stronger Insulation Bonding
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Solution Overview
Problem
Implantable medical devices (IMDs) face challenges with weak adhesive bonds between electrodes and insulative materials due to harsh environmental conditions and the inert nature of metals used, leading to reliability and safety issues.
Innovation Solution
The use of a metal substrate with a metal coating, such as titanium nitride, platinum black, or iridium oxide, applied on both the connection and active segments of the electrode, which enhances the adhesive bond strength with insulative materials, eliminating the need for abrasive surface treatments and improving the electrode's durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inert metal substrate is used for the electrode, then biocompatibility and corrosion resistance are improved, but adhesive bond strength with insulative material deteriorates
Solution Approach 1:
The patent applies a multi-layer composite structure consisting of an inert metal substrate (platinum, iridium, or titanium) combined with a metal coating layer (titanium nitride, platinum black, or iridium oxide). This composite structure maintains the biocompatibility and corrosion resistance of the inert metal while adding adhesive properties through the metal coating layer, resolving the contradiction between inertness and bondability.
Solution Approach 2:
The metal coating is applied selectively to specific regions of the electrode, particularly at the connection segment where adhesive bonding is required. This local application maintains the inert properties of the substrate where needed while providing enhanced adhesive characteristics only at the bonding interface, optimizing both biocompatibility and bond strength.
2Duration of action of stationary object
If the electrode is exposed to harsh environmental conditions in the body, then operational durability is improved, but adhesive bond stability deteriorates due to fatigue and mechanical strain
Solution Approach 1:
The multi-layer composite structure with the metal coating layer provides enhanced mechanical strength and flexibility, allowing the electrode to withstand fatigue from heartbeats and mechanical strain from patient movement. The coating layer acts as a buffer that maintains adhesive bond integrity under harsh environmental conditions.
Solution Approach 2:
The metal coating layer serves as a protective buffer that anticipates and absorbs the effects of mechanical strain and fatigue before they can damage the adhesive bond. This pre-protective layer cushions the bonding interface against the harsh environmental conditions expected during the device's operational lifespan.
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 solution provides strong and reliable adhesive bonds between the electrode and insulative material, enhancing the IMD's operational lifespan and safety by withstanding mechanical and chemical stress within the body.
Implementation Method 1
The metal coating is disposed on an outer surface of the metal substrate along both the connection segment and the active segment... the adhesive adheres to the metal coating on the connection segment
Data Source
AI summary
An implantable medical device includes an electrode and an insulative material secured to the electrode. The electrode includes a metal substrate and a metal coating. The metal coating is disposed on an outer surface of the metal substrate. The insulative material is secured to the electrode via an adhesive that adheres to the metal coating.