Rigid Base Probe Insertion Device for Neural Tissue
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Solution Overview
Problem
Existing methods for implanting soft, flexible neural probes into tissue face challenges such as buckling, tissue damage, and restricted probe design, as they struggle to achieve the necessary stiffness for successful insertion while minimizing tissue damage and maintaining long-term functionality.
Innovation Solution
A probe insertion device with a rigid base that temporarily attaches to the probe, providing structural support during implantation, and a surface coating that reduces the bond between the base and probe in the presence of fluids, allowing for easy removal of the base without displacing the probe, facilitating the implantation of soft, flexible neural probes made of biocompatible materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft, flexible probes are used for long-term implantation, then probe-tissue integration is improved and tissue damage is minimized, but the probes buckle and deflect during insertion making reliable implantation difficult
Solution Approach 1:
The system divides the probe into two functional segments: a flexible probe portion for long-term implantation and a separate rigid base portion for insertion support. The flexible probe (e.g., polymer or silicon) maintains buckling resistance during insertion when attached to the rigid base, then can be separated or remain integrated depending on the embodiment, achieving both insertion reliability and long-term flexibility.
Solution Approach 2:
The system combines materials with different mechanical properties - a rigid base material (e.g., metal, ceramic, or stiff polymer) with a flexible probe material (e.g., soft polymer, silicon, or elastomer). This composite structure allows the rigid base to provide insertion stiffness while the flexible probe provides long-term tissue compatibility and minimal micromotion.
2Ease of operation
If rigid structures are integrated within flexible probes to provide insertion stiffness, then insertion reliability is improved, but probe design is restricted and tissue damage increases due to larger footprint
Solution Approach 1:
Instead of integrating rigid structures within the flexible probe body, the system segments the rigid support function into a separate base portion that attaches to the flexible probe. This allows the flexible probe to maintain its full design flexibility and sub-cellular dimensions while the separate rigid base provides the necessary insertion stiffness without increasing the probe's implanted footprint.
3Ease of operation
If stiff biodegradable coatings or elements are applied to flexible probes to achieve insertion stiffness, then insertion reliability is improved, but the desired probe flexibility is negated and tissue damage increases
Solution Approach 1:
The system separates the rigid support function into a distinct base portion rather than applying stiff coatings to the flexible probe. The flexible probe maintains its inherent flexibility and biocompatible material properties (e.g., polymer, silicon) while the separate rigid base provides insertion stiffness. This segmentation allows the probe to achieve both insertion reliability and maintained flexibility without compromising tissue compatibility.
4Force
If larger rigid structures are used to support soft probes during insertion, then insertion stiffness is improved, but tissue damage increases due to larger implanted footprint
Solution Approach 1:
The system segments the support structure into a rigid base for insertion and a minimal flexible probe for implantation. The rigid base can be relatively large to provide sufficient insertion stiffness and handling, but only the minimal necessary flexible probe portion (with sub-cellular dimensions) is implanted into the tissue, minimizing the implanted footprint and associated tissue damage while still achieving the required insertion forces.
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
Enables the successful insertion of soft, flexible probes into tissue with reduced tissue damage and improved long-term stability, allowing for higher fidelity and longer-lasting neural interfaces by minimizing micromotion and reactive tissue responses.
Implementation Method 1
a surface coating that reduces the bond between the base and probe in the presence of fluids
Data Source
AI summary
A probe insertion device for implanting a probe into tissue includes a rigid base that selectively attaches to the probe due to a bond between the base and the probe, that provides a structural backbone to the probe, is longitudinally aligned with the probe, and can be adapted to receive a fluid between the base and the probe. The probe insertion device can include a surface covering at least a portion of the base that reduces the bond between the base and the probe in the presence of the fluid.