Deployable Neural Probe Sites for Scar Tissue Reduction
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Solution Overview
Problem
Probes for electrical interfaces with biological tissue face challenges due to the formation of scar tissue, which increases impedance and diminishes the effectiveness of site monitoring/stimulation over time, and causes cellular damage during insertion and chronic use.
Innovation Solution
The use of spring actuators that deploy sites away from the shank, allowing them to penetrate deeper into biological tissue, combined with capillary action forces or dissolvable glues for controlled deployment and retraction, minimizes scar tissue formation and maintains site functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sites are kept in direct contact with biological tissue for chronic use, then monitoring/stimulation function is maintained initially, but scar tissue formation increases impedance and diminishes effectiveness over time
Solution Approach 1:
The probe employs deployable sites that can dynamically change their position relative to the shank. Sites are deployed into biological tissue for monitoring/stimulation, then retracted back toward the shank to minimize scar tissue formation. This dynamic movement allows the system to adapt between two states: engaged for functionality and disengaged for minimizing harm, resolving the contradiction between maintaining site effectiveness and reducing scar tissue formation.
Solution Approach 2:
The probe uses spring actuators pre-loaded with mechanical energy to deploy sites into tissue. The springs are initially compressed or tensioned during probe fabrication, storing the energy needed for deployment. When deployed, the pre-stored energy automatically propels the sites into the tissue without requiring external power sources during operation, enabling the site to be positioned for functionality before chronic use begins.
2Reliability
If sites are deployed deeper into biological tissue to access active neurons, then information exchange is enhanced, but cellular damage increases during insertion
Solution Approach 1:
The probe separates the insertion function from the deployment function. The sharp shank is inserted first to create a pathway with minimal cellular damage, while the sites remain retracted and protected during insertion. After the shank is positioned, the sites are deployed along the pre-created pathway into the tissue. This segmentation allows deep penetration to reach active neurons without the sites causing additional cellular damage during the insertion process.
Solution Approach 2:
The shank is inserted into the biological tissue first to create a safe pathway before the sites are deployed. This preliminary action of creating the insertion path minimizes cellular damage by concentrating the mechanical stress on the shank rather than on the more delicate sites. Once the pathway is established, sites are deployed into the tissue along this pre-formed channel, enabling deep access to active neurons with reduced cellular damage.
3Object-affected harmful factors
If sites are retracted toward the shank to minimize scar tissue formation, then harm to biological tissue is reduced, but contact with active neurons may be lost
Solution Approach 1:
The probe implements dynamic control of site position through deployable mechanisms. Sites can be positioned in an extended state to maximize contact with active neurons for reliable monitoring and stimulation. When scar tissue formation becomes problematic, the same sites can be retracted toward the shank to minimize harm. This dynamic adaptability allows the system to optimize between neuron contact and scar tissue minimization based on operational needs, resolving the contradiction between these two opposing requirements.
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 approach reduces the formation of scar tissue, maintains site functionality, and allows for stable long-term monitoring/stimulation by deploying sites closer to active neurons, thereby enhancing the exchange of information between the probe and biological tissue.
Implementation Method 1
The spring actuators may be made from any material or combination of materials known to exhibit spring-like behavior
Implementation Method 2
The spring actuators, and consequently the sites, may be deployed and/or retracted through the use of implantation forces, capillary action forces, shape memory alloys, dissolvable glues, or a combination thereof
Implementation Method 3
The spring actuators, and consequently the sites, may be deployed and/or retracted through the use of implantation forces, capillary action forces, shape memory alloys, dissolvable glues, or a combination thereof
Implementation Method 4
The spring actuators, and consequently the sites, may be deployed and/or retracted through the use of implantation forces, capillary action forces, shape memory alloys, dissolvable glues, or a combination thereof
Data Source
AI summary
A probe for interfacing with biological tissue includes a shank. A site to receive a signal from or stimulate the biological tissue is deployably connected to the shank. An insulated interconnect is connected to the site to guide signals or a fluid between the site and the shank. An actuator displaces the site away from a protected position on the shank to a deployed position in the biological tissue to be monitored or stimulated by the site.