Peripheral Nerve Microclip Interface With Stretchable Electrodes
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Solution Overview
Problem
Existing peripheral nerve interfaces (PNIs) face challenges in achieving long-lasting interfacing with smaller nerves due to mechanical property mismatches and limited biomechanical compliance, leading to nerve damage and scar tissue formation.
Innovation Solution
A novel PNI is developed, featuring a 2-photon 3D printed microclip with a clamping mechanism that integrates a stretchable microelectrode array (sMEA). This design allows for high-resolution recording and stimulation of small nerve branches while accommodating variations in nerve diameter without damaging the nerve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid electrodes with high elastic moduli are used to interface with nerves, then structural stability is improved, but mechanical compliance with soft nerve tissue deteriorates, causing nerve damage and scar tissue formation
Solution Approach 1:
The patent changes the elastic modulus parameter of the electrode material from gigapascal range (rigid) to kilopascal range (soft), matching the mechanical properties of nerve tissue. This parameter change enables the electrode to conform to nerve movements and deformations without causing mechanical damage, while maintaining stable electrical contact for long-term recording and stimulation.
Solution Approach 2:
The patent employs composite material structures combining soft elastic substrates with conductive elements. The substrate material (e.g., silicon rubber or polyurethane) provides mechanical compliance matching nerve tissue, while embedded conductive traces and electrodes deliver electrical functions. This composite approach resolves the contradiction between structural stability and mechanical compliance.
2Measurement precision
If stiff penetrating electrodes are used to achieve close proximity to nerve fibers, then recording sensitivity is improved, but nerve trauma and scar tissue deposition worsen
Solution Approach 1:
The patent uses flexible thin film electrodes that can conform to the nerve surface and penetrate gently into the nerve fascicles. The thin film structure (micrometer-scale thickness) minimizes mechanical disruption to nerve fibers while maintaining close proximity for high-fidelity recording. The flexibility allows the electrode to follow nerve deformations without causing trauma.
Solution Approach 2:
The patent changes the mechanical parameters of the electrode (reducing stiffness and increasing flexibility) to enable gentle penetration and close contact with nerve fibers. This parameter optimization allows the electrode to achieve recording sensitivity comparable to rigid electrodes without causing significant nerve trauma or scar tissue formation.
3Object-affected harmful factors
If cuff electrodes are used to minimize invasiveness, then nerve damage is reduced, but recording sensitivity and stimulation selectivity deteriorate due to large distance from nerve fibers
Solution Approach 1:
The patent transitions from traditional circumferential cuff electrodes to a linear array configuration that can be positioned in close proximity to nerve fibers. This dimensional change allows the electrode array to interface with multiple nerve fascicles simultaneously, achieving both minimal invasiveness and high recording sensitivity through close contact with individual fibers.
Solution Approach 2:
The patent segments the electrode into multiple independent contact points arranged in an array, allowing selective positioning and stimulation of specific nerve fascicles. This segmentation enables close proximity to individual nerve fibers for high sensitivity recording while maintaining overall minimal invasiveness through distributed contact points rather than a single bulky cuff.
4Reliability
If sieve electrodes are used to provide mechanical guidance for regenerating nerves, then nerve regeneration is improved, but invasiveness worsens due to requiring nerve cut and regeneration
Solution Approach 1:
The patent applies preliminary action by pre-positioning the flexible electrode array on the nerve before any regeneration process is needed. The electrode maintains stable contact and provides continuous monitoring and stimulation, eliminating the need for subsequent invasive interventions to reposition or adjust the interface during the regeneration process.
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 novel PNI achieves chronic attachment to small nerve branches, providing high-quality bi-directional interfacing with minimal impact on nerve health. It enables precise modulation of signals and maintains stable recording and stimulation characteristics over time.
Implementation Method 1
Peripheral nerves are heterogeneous viscoelastic structures, with elastic and shear moduli in the 5-500 kPa range, that exist in a biomechanically dynamic environment, and accommodate body movement and local tissue strain through a combination of deformation and displacement
Implementation Method 2
A novel PNI is developed, featuring a 2-photon 3D printed microclip with a clamping mechanism that integrates a stretchable microelectrode array (sMEA)
Implementation Method 3
an interface connected to the second end of the stretchable microelectrode array and configured to interface with an external device for applying electrical stimulation to the nerve seated in the lower seating portion and for recording electrical characteristic of the nerve seated in the lower seating portion via the plurality of electrodes
Implementation Method 4
configured to interface with an external device for applying electrical stimulation to the nerve seated in the lower seating portion
Data Source
AI summary
A peripheral nerve interface including a microclip having a substantial U-shape and including an upper entry portion for entry of a nerve into the microclip and a lower seating portion for seating the nerve in the lower seating portion of the microclip; a stretchable microelectrode array including a plurality of electrodes, wherein the stretchable microelectrode array has a proximal end portion fixed to the microclip and a portion that is moveable and dragged into the upper entry portion and then the lower entry portion of the microclip in response to the microclip be positioned on the nerve; and an interface connected to a distal end of the stretchable microelectrode array and configured to interface with an external device for applying electrical stimulation to the nerve seated in the lower seating portion and for recording electrical characteristic of the nerve seated in the lower seating portion via the plurality of electrodes in the stretchable microelectrode array.