Flexible Electrode with Limiting Layer for Stable BCI Implantation
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Solution Overview
Problem
Existing brain-computer interface (BCI) systems face challenges in developing invasive electrodes that are flexible, stable, and biocompatible for long-term signal interaction with biological tissues while minimizing tissue damage.
Innovation Solution
A flexible electrode design comprising an implantable and flexible electrode wire with a multilayer structure, including insulating layers, a wire layer, and electrode sites, along with a continuous limiting layer for maintaining electrode wire arrangement during implantation. The manufacturing method involves layer-by-layer deposition on a flexible separation layer, followed by separation from the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible electrode wire with multilayer structure is used, then biocompatibility and flexibility are improved, but device complexity increases
Solution Approach 1:
The electrode wire is divided into multiple functional layers: insulating layer, wire layer, and electrode site layer. Each layer performs a specific function (protection, conduction, signal interaction), allowing the complex requirements of flexibility and biocompatibility to be distributed across simple, specialized components rather than requiring a single complex structure
Solution Approach 2:
The electrode employs composite material construction with distinct layers made from materials optimized for their specific functions. The insulating layer uses biocompatible materials for protection, while the wire layer uses conductive materials, creating a composite structure that achieves both flexibility and electrical functionality
2Manufacturing precision
If electrode wires are kept in fixed arrangement during implantation, then implantation precision is improved, but ease of operation deteriorates
Solution Approach 1:
The limiting layer is pre-formed on the substrate with predetermined positions for electrode wires before implantation. This preliminary arrangement ensures precise positioning is established in advance, and the wires are guided into their correct positions during implantation without requiring complex real-time alignment procedures
3Manufacturing precision
If a continuous limiting layer is used to maintain electrode wire arrangement, then electrode wire positioning is improved, but device complexity increases
Solution Approach 1:
The limiting layer serves multiple functions simultaneously: it maintains the arrangement of electrode wires during implantation, provides structural support, and ensures precise positioning. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity while achieving precise positioning
Data Source
AI summary
The present disclosure relates to a flexible electrode and a manufacturing method therefor. Provided is a flexible electrode, comprising at least one implantable and flexible electrode wire and a continuous limiting layer. Each electrode wire comprises: a wire, the wire being located between a first insulating layer and a second insulating layer of the flexible electrode, and an electrode site, the electrode site being in contact with the biological tissue after implantation of the electrode wire, being located on the first insulating layer, and being electrically coupled to the wire by means of a through hole in the first insulating layer. The limiting layer is located on the at least one electrode wire and is configured to be detachably adhered to the at least one electrode wire, so that the at least one electrode wire is kept in a fixed arrangement during the implantation process.