Wireless Neural Stimulator Controller With Closed-Loop Feedback
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Solution Overview
Problem
Current neural modulation therapies using electrical stimulation face challenges in efficiently delivering targeted electrical pulses to neural tissue due to impedance mismatches and variations in patient anatomy, which can lead to suboptimal treatment efficacy and potential tissue damage.
Innovation Solution
A wireless neural stimulation system that includes a controller module with a storage device, modulator, and antennas to generate and transmit a stimulation waveform, using closed-loop feedback control to adjust parameters such as pulse amplitude and frequency based on real-time telemetry feedback, ensuring undistorted electrical pulses are applied to neural tissue despite tissue impedance and antenna characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical stimulation is delivered through implanted electrodes to neural tissue, then therapeutic benefits are achieved for chronic disabling conditions, but impedance mismatches and anatomical variations cause suboptimal treatment efficacy and potential tissue damage
Solution Approach 1:
The system employs closed-loop feedback control where the controller receives real-time information about the actual electrical pulses applied to neural tissue and adjusts stimulation parameters accordingly. This feedback mechanism compensates for impedance mismatches and anatomical variations, ensuring optimal stimulation delivery while preventing tissue damage from excessive currents.
Solution Approach 2:
The controller dynamically adjusts stimulation parameters including pulse amplitude, pulse width, and frequency based on feedback from the neural tissue response. This parameter optimization ensures that stimulation remains within safe thresholds while maintaining therapeutic efficacy despite variations in patient anatomy and tissue impedance.
2Ease of operation
If fixed polarity assignments are used for electrodes in neural stimulation, then device simplicity is maintained, but suboptimal activation of varying axon diameters reduces therapeutic effectiveness
Solution Approach 1:
The system transitions from fixed polarity assignments to dynamic polarity control. The controller can adjust electrode polarities in real-time based on feedback from neural tissue response, allowing selective activation of different axon diameters and optimizing therapeutic effectiveness while maintaining the simplicity of the implanted passive device architecture.
3Manufacturing precision
If implanted electrodes are used for neural stimulation, then targeted electrical pulses can be delivered to neural tissue, but impedance mismatches and anatomical variations lead to distorted electrical pulses and suboptimal treatment
Solution Approach 1:
The closed-loop feedback system continuously monitors the actual electrical pulses delivered to neural tissue and compares them against desired pulse parameters. The controller adjusts stimulation signals in real-time to compensate for distortions caused by impedance mismatches and anatomical variations, ensuring consistent and accurate pulse delivery across different patients and treatment sessions.
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 ensures consistent and effective neural stimulation by compensating for impedance mismatches and anatomical variations, maintaining optimal stimulus power and reducing the risk of tissue damage through precise adjustment of electrical pulses.
Implementation Method 1
The one or more antennas configured to transmit the transmission signal to the implantable, passive stimulation device
Data Source
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AI summary
A system includes a controller module, which includes a storage device, a controller, a modulator, and one or more antennas. The storage device is stored with parameters defining a stimulation waveform. The controller is configured to generate, based on the stored parameters, an output signal that includes the stimulation waveform, wherein the output signal additionally includes polarity assignments for electrodes in an implantable, passive stimulation device. The modulator modulates a stimulus carrier signal with the output signal to generate a transmission signal. The one or more antennas transmit the transmission signal to the implantable, passive stimulation device such that the implantable, passive stimulation device uses energy in the transmission signal for operation, sets the polarities for the electrodes in the implantable, passive stimulation device based on the encoded polarity assignments, generates electrical pulses using the stimulation waveform, and applies the electrical pulses to excitable tissue.