Nanoparticle Probes for Wireless Brain Activity Monitoring
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Solution Overview
Problem
Current brain activity monitoring methods are invasive, limited in spatial resolution, and unable to non-invasively record electrophysiological signals with high spatiotemporal resolution, posing challenges for diagnosing and treating brain diseases like epilepsy.
Innovation Solution
Development of nanoparticle probes that convert electrophysiological activity into optically detectable signals using near-infrared light, enabling wireless, non-invasive measurement of neural activity through the use of electro-plasmonic nanoantennas and electrochromic polymers, allowing for remote detection without invasive surgery or wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrode arrays are used for brain activity recording, then high temporal resolution is achieved, but spatial multiplexing capability and invasiveness are limited
Solution Approach 1:
The patent replaces the mechanical/electrical wiring system of conventional electrode arrays with an optical detection system. Nanoparticle probes functionalized with voltage-sensitive dyes convert electrical neural activity into optical signals that can be detected wirelessly through the skull, eliminating the need for complex intracranial wiring while maintaining high temporal resolution
Solution Approach 2:
The patent introduces nanoparticle probes as intermediary agents that mediate between neural electrical activity and external detection. These particles act as transducers, converting biophysical signals into optically detectable forms that can be read through the skull without direct electrical contact, thereby reducing wiring complexity
2Measurement precision
If electrode arrays are used to record brain activity, then electrophysiological signals are detected, but invasive surgery is required
Solution Approach 1:
The patent replaces invasive electrical electrode implantation with non-invasive optical detection. By functionalizing nanoparticles with voltage-sensitive dyes and delivering them systemically, the system achieves electrophysiological signal detection through the intact skull, eliminating the need for craniotomy or burr hole surgery
Solution Approach 2:
The nanoparticle probes are delivered systemically through the bloodstream and self-assemble at the target site, eliminating the need for surgical implantation. The particles autonomously functionalize with voltage-sensitive dyes and position themselves near neurons, providing self-service delivery and positioning
3Ease of operation
If non-invasive fNIRS is used for brain monitoring, then no surgery is required, but only hemodynamic signals can be measured
Solution Approach 1:
The patent creates a multi-functional nanoparticle probe that combines the non-invasive optical detection capability of fNIRS with voltage-sensitive dye functionality. This universal probe can detect both hemodynamic changes (through optical absorption) and electrical neural activity (through voltage-sensitive fluorescence), enabling simultaneous measurement of multiple physiological parameters through a single non-invasive system
4Measurement precision
If visible light-based GEVIs are used for neural activity detection, then high spatial resolution is achieved, but light attenuation in tissue limits penetration depth
Solution Approach 1:
The patent changes the optical wavelength parameter from visible light to near-infrared light for the illumination source. NIR light at wavelengths of 700-900 nm experiences reduced scattering and absorption in biological tissue, enabling deeper penetration through the skull while maintaining the voltage-sensitive dye fluorescence detection capability for high spatial resolution
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 high-resolution, non-invasive monitoring of neural activity with a high signal-to-noise ratio, capable of detecting single neuron signals and providing long-term operation without triggering glial cell responses, thus improving diagnostic capabilities for brain diseases.
Implementation Method 1
an electrochromic polymer coating disposed over the conductive shell
Implementation Method 2
the spectrum of the backscattered NIR light is modulated by the electrochromic loading of the plasmonic (electro-plasmonic) nanoantenna
Implementation Method 3
the near infrared (NIR) light can penetrate through the skull and into the brain cortex
Implementation Method 4
the nanoparticle probe reports the spiking activity of cells by modulating the incoming NIR light coupling and the re-radiated light spectrum that is sent back to the reader using backscattering
Data Source
AI summary
A system includes a light source configured to illuminate a target site in a brain with a near infrared light having a wavelength from about 1000 nm to about 1700 nm. The system also includes a plurality of nanoparticle probes disposed at the target site, each of the nanoparticle probes may include: a core having a substantially spherical shape, a conductive shell disposed over the core, and an electrochromic polymer coating disposed over the conductive shell. The system may further include an image sensor configured to receive backscattered light from the plurality of nanoparticles illuminated by the near infrared light. The plurality of nanoparticle probes is configured to shift their backscattering spectrum in response to a change in an electrical field at the target site.