Flexible Microelectrode Sleeve for Tissue Motion and Fluid Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Implantable microelectrodes and microfibers experience tissue irritation and displacement due to shear forces from tissue movements, leading to inflammation and potential dislocation, with issues of aqueous fluid transfer between tissue compartments.
Innovation Solution
A microelectrode design featuring a flexible, rotationally symmetric envelope or sleeve with a radial separating wall, allowing lateral movement and preventing axial displacement, and a flexible lead with increased length to minimize tissue contact and fluid exchange, using biocompatible materials that degrade upon implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a thin insulated flexible electrical lead is used to connect the microelectrode to control devices, then electrical connection is provided, but tissue irritation and inflammation occur due to shear forces from tissue movements
Solution Approach 1:
The patent applies this principle by using a flexible polymer coating or envelope that surrounds the microelectrode and lead interface. This flexible shell absorbs and distributes the shear forces generated by tissue movements, preventing direct transmission of mechanical stress to the tissue-lead interface. The coating acts as a mechanical buffer that maintains electrical connectivity while protecting surrounding tissue from irritation and inflammation caused by relative movements between tissues of varying stiffness.
2Ease of operation
If a thin flexible lead bridges tissues of various stiffness, then electrical connection is achieved, but displacement and shear forces cause microelectrode dislocation
Solution Approach 1:
The flexible polymer coating envelops the microelectrode and lead interface, providing mechanical stability while maintaining flexibility. This shell structure reduces the impact of shear forces from tissue movements, preventing dislocation of the microelectrode. The coating's mechanical properties allow it to accommodate tissue movements without transmitting excessive stress that would cause positional displacement, thereby maintaining stable microelectrode positioning while preserving electrical connectivity.
3Stability of the object's composition
If the microelectrode is firmly fixed to prevent dislocation, then positional stability is improved, but lateral movement freedom is reduced
Solution Approach 1:
The flexible polymer coating provides a balanced mechanical interface that allows controlled lateral movement while preventing excessive displacement. The coating's viscoelastic properties enable it to accommodate physiological movements and positioning adjustments (maintaining adaptability) while providing sufficient mechanical restraint to prevent complete dislocation (maintaining stability). This creates an optimal balance between fixation strength and movement freedom.
4Object-affected harmful factors
If the lead is made shorter to reduce tissue contact, then tissue irritation is reduced, but electrical connection reliability is compromised
Solution Approach 1:
The flexible polymer coating on the lead provides electrical insulation and mechanical protection, allowing the use of shorter leads without compromising reliability. The coating maintains electrical isolation between the lead and surrounding tissues, preventing short circuits and interference while the flexible structure ensures mechanical durability. This enables shorter lead lengths that reduce tissue irritation and shear force exposure while the protective coating maintains connection reliability through enhanced electrical isolation and mechanical robustness.
Data Source
AI summary
A microelectrode probe for implantation into soft tissue comprises an envelope of flexible polymer material divided by a wall into a distal and a proximal compartment filled with matrices of biocompatible material dissolvable or degradable in aqueous body fluid and comprising a centrally disposed electrically conducting core penetrating the wall and attached to it. The core is insulated at its proximal portion from which it extends to a holder for attachment to a tissue different from said soft tissue. The envelope and the core extending distally from the holder are embedded in an additional matrix of similar kind. Also disclosed is method for its manufacture, an array comprising two or more microelectrode probes and a microelectrode probe for incorporation into the array as well as method for the manufacture of the array.