Deep Brain Stimulation via Temporal Interference
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Solution Overview
Problem
Current deep brain stimulation methods face challenges in achieving precise and focal stimulation of deep brain structures without causing tissue damage or discomfort, particularly due to limitations in non-invasive techniques such as transcranial magnetic and electrical stimulation, which struggle with depth and focality, and invasive methods are risky and difficult to translate to humans.
Innovation Solution
A deep brain stimulation system utilizing multiple stimulation pairs of electrodes with carefully calculated carrier frequencies and phases to create a focal stimulation point, reducing the intensity of electric fields and increasing focality, allowing for non-invasive stimulation of deep brain structures while minimizing tissue damage and discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If non-invasive brain stimulation methods (TMS, tES) are used to stimulate cortical regions, then physical discomfort and tissue damage are avoided, but the depth of stimulation is limited and cannot reach regions below the cortex
Solution Approach 1:
The scalp is divided into multiple electrode pairs positioned at specific locations, each generating an electric field that contributes to the overall stimulation pattern. This segmentation allows the electric fields to intersect and create a focal stimulation point at deep brain targets while distributing the current load across multiple electrode sites, thereby maintaining non-invasiveness and reducing discomfort.
Solution Approach 2:
The patent transitions from surface-level cortical stimulation to deep subcortical stimulation by introducing a temporal dimension through high-frequency carrier waves. Two high-frequency electric fields (above 1 kHz) are applied simultaneously, and their temporal interference creates a low-frequency envelope (below 500 Hz) that focuses stimulation at a specific depth below the cortex, effectively adding a temporal dimension to achieve spatial depth.
2Manufacturing precision
If high amplitude currents are applied to the scalp to activate cortical areas, then behavioral responses are changed, but physical discomfort increases significantly
Solution Approach 1:
The patent employs periodic high-frequency carrier waves (above 1 kHz) that are modulated to create a temporal interference pattern. The periodic nature of these high-frequency waves allows them to penetrate the skull with reduced discomfort, while their interference creates a lower-frequency envelope that effectively stimulates deep brain structures, thereby maintaining stimulation effectiveness while reducing physical discomfort.
Solution Approach 2:
The patent changes the frequency parameter of the applied electric fields, using high-frequency carrier waves (above 1 kHz) instead of traditional low-frequency currents. This parameter change allows the electric fields to penetrate the skull more efficiently with reduced discomfort, while the temporal interference between multiple high-frequency fields creates a low-frequency envelope that maintains stimulation effectiveness at deep targets.
3Measurement precision
If invasive electrode implantation is used to achieve precise control and high spatial focality, then cell-type-specific control is achieved, but tissue damage and surgical risk increase significantly
Solution Approach 1:
The patent uses temporal interference between high-frequency electric fields as an intermediary mechanism to achieve precise spatial focality without direct electrode contact with brain tissue. The interference pattern of multiple high-frequency fields creates a virtual focal point at the desired deep brain target, acting as a mediator that translates surface electrode placement into precise subcortical stimulation while avoiding invasive procedures and associated risks.
Solution Approach 2:
The patent replaces the mechanical invasive system of electrode implantation with a non-invasive electrical field interference system. Instead of physically inserting electrodes into the brain to achieve spatial focality, the invention uses the interference pattern of multiple high-frequency electric fields to create a virtual focal point at the target location, thereby substituting a mechanical invasive approach with an electrical non-invasive approach that achieves comparable or superior precision.
4Object-affected harmful factors
If multiple high-frequency electric fields are applied using temporal interference, then deep brain structures can be stimulated non-invasively, but the focality and precision of stimulation are reduced compared to invasive methods
Solution Approach 1:
The patent divides the stimulation task among multiple electrode pairs, each generating a high-frequency electric field with a specific spatial distribution. By segmenting the overall stimulation into multiple contributing fields, the system can create a focal interference pattern at the deep brain target while distributing the current load, thereby improving focality and precision compared to using a single electrode pair.
Solution Approach 2:
The patent introduces a temporal dimension by using high-frequency carrier waves (above 1 kHz) that interfere to create a low-frequency envelope (below 500 Hz). This temporal interference mechanism adds a time-based layer of control that allows precise spatial focality at deep targets, overcoming the spatial limitations of traditional non-invasive methods and achieving precision comparable to invasive approaches.
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 system achieves more precise and focal stimulation of deep brain structures with lower applied currents, improving the effectiveness of non-invasive deep brain stimulation by creating a focal point with multiple interacting fields, reducing the necessary current and minimizing discomfort, and enabling stimulation of previously inaccessible regions.
Implementation Method 1
Two electric fields at two different high frequencies are applied causing an envelope frequency for stimulation at a desired point in space
Implementation Method 2
each stimulation pair of electrodes providing an electric stimulation at a carrier frequency
Data Source
AI summary
The deep brain stimulation system has at least four stimulation pairs of electrodes. Each stimulation pair of electrodes provides an electric stimulation at a carrier frequency. The mean value between the carrier frequency of any first stimulation pair of electrodes and the carrier frequency of any second stimulation pair of electrodes defines a first mean carrier frequency. The mean value between the carrier frequency of any third stimulation pair of electrodes and the carrier frequency of any fourth stimulation pair of electrodes defines a second mean carrier frequency. The difference between the first and second mean carrier frequencies is equal to or greater than 200 Hz.