Quasi-Static Brain Interface Communication With Low Tissue Absorption
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Solution Overview
Problem
Existing wireless communication systems for implantable devices, such as brain-machine interfaces, face challenges including high power consumption, tissue absorption, and transduction losses, which can lead to cortical scarring, infection, and interference with physiological signals.
Innovation Solution
A wireless communication system utilizing Bi-Phasic Quasi-Static Brain Communication (BP-QBC) that includes a first device implanted in the patient and a second device disposed epicutaneously, using dipole coupling and modulated electro-quasistatic signals to reduce power consumption and enhance data transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If RF transmission is used for wireless communication, then data transfer capability is achieved, but tissue absorption increases requiring higher transmitter power that exceeds safety guidelines
Solution Approach 1:
The patent changes the fundamental parameter of transmission frequency from RF range to electro-quasistatic range (below 1 kHz), dramatically reducing tissue absorption and allowing safe operation at low power levels while maintaining data transfer capability through modulated impedance changes
Solution Approach 2:
The patent replaces electromagnetic RF transmission with an electro-quasistatic field-based communication system that uses modulated impedance of brain tissue as the transmission medium, substituting traditional wireless communication mechanics with a bio-impedance modulation approach
2Use of energy by moving object
If Optical or Ultrasonic telemetry is used for wireless communication, then tissue absorption is reduced compared to RF, but significant transmission loss occurs due to scattering and skull absorption requiring sub-cranial interrogator placement
Solution Approach 1:
The patent uses brain tissue impedance as an intermediary medium for signal transmission, where the tissue itself becomes the communication channel through modulated impedance, eliminating the need for sub-cranial placement while avoiding scattering and absorption losses of optical and ultrasonic methods
Solution Approach 2:
The electro-quasistatic field serves multiple functions simultaneously: it enables wireless communication, provides power delivery, and utilizes the natural electrical properties of brain tissue without requiring specialized interrogator placement, making the system universally applicable
3Use of energy by moving object
If Magneto-Electric methods are used for wireless communication, then tissue absorption is low, but transduction loss is large requiring high electric field strength that may interfere with physiological signals
Solution Approach 1:
The patent replaces magneto-electric transduction with direct electro-quasistatic field communication, eliminating the inefficient magnetic-to-electric field conversion step and achieving direct electrical coupling through modulated tissue impedance, thereby reducing both transduction loss and required field strength
4Reliability
If tethered data transmission and wired power delivery are used in BMIc, then reliable communication is achieved, but patient cortical scarring, gliosis, infection, and CSF leakage risk increase
Solution Approach 1:
The patent extracts and removes the physical tether connection between external and implanted components, replacing it with wireless electro-quasistatic field communication, thereby eliminating the source of cortical scarring, infection, and CSF leakage while maintaining communication reliability
Solution Approach 2:
The implanted device uses the body's own electrical properties (brain tissue impedance) as the communication medium, allowing the system to self-configure and operate without external physical connections, eliminating the need for tethers and their associated risks
5Loss of information
If higher transmitter power is used to compensate for transmission losses, then data transfer capability is maintained, but interference with physiological signals and unintentional brain tissue stimulation occurs
Solution Approach 1:
The patent changes the transmission frequency parameter to electro-quasistatic range where tissue impedance modulation can achieve data transfer at very low power levels, preventing physiological signal interference and unintentional stimulation while maintaining adequate data transfer capability
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 BP-QBC system achieves lower power consumption, reduced tissue absorption, and improved data transfer efficiency, minimizing the risk of tissue damage and interference with physiological signals, while allowing for comfortable and maintenance-free implantation.
Implementation Method 1
The first device may utilize dipole coupling to create an electric field between the first electrode and the second electrode
Implementation Method 2
a modulated electro-quasistatic signal is coupled to the internal tissue of the patient through a plurality of electrodes
Data Source
AI summary
A system and method for brain-machine interface communication utilizing Bi-Phasic Quasi-Static Brain Communication (BP-QBC). The system includes a first device and a second device that are in wireless communication together. The system and method include signal transmission between the first device and the second device through dipole coupling. The system is configured to utilize compressive sensing and collision avoidance for enhanced net energy efficiency. The system and method utilize fully electrical quasi-static signaling to militate against energy transduction losses.