Neuromodulation Pre-Pulse Waveform Timing for Adaptive ECAP Feedback
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Solution Overview
Problem
Current spinal cord stimulation systems lack the ability to dynamically adjust stimulation parameters based on real-time neural responses, leading to suboptimal therapeutic outcomes and potential side effects.
Innovation Solution
A neuromodulation system that utilizes a microcontroller to issue waveforms to neural tissue, receive signals from sensing electrodes, and adjust the timing and characteristics of subsequent waveforms based on sensed neural responses, including the use of pre-pulse components to enhance or suppress neural activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spinal cord stimulation systems use fixed stimulation parameters, then device complexity is reduced, but therapeutic effectiveness deteriorates due to inability to adapt to real-time neural responses
Solution Approach 1:
The system measures spinal cord potentials (SCPs) in real-time and uses this feedback to dynamically adjust stimulation parameters. The microcontroller continuously monitors neural responses and modifies waveform characteristics accordingly, creating a closed-loop control system that adapts to changing neural conditions while maintaining therapeutic effectiveness.
Solution Approach 2:
The stimulation system transitions from static fixed parameters to dynamic adjustable parameters. The microcontroller enables real-time modification of stimulation waveforms based on measured SCPs, allowing the system to adapt its behavior dynamically according to the patient's neural response state.
2Adaptability or versatility
If spinal cord stimulation systems measure neural responses in real-time, then adaptability is improved, but device complexity increases due to additional sensing and control circuitry
Solution Approach 1:
The electrode array serves dual functions: delivering stimulation waveforms to the spinal cord and simultaneously sensing neural responses. This multi-functionality eliminates the need for separate sensing electrodes, reducing overall system complexity while enabling real-time measurement of spinal cord potentials for adaptive stimulation control.
Solution Approach 2:
The stimulation and sensing functions are merged into a single integrated system. The same electrode array and microcontroller handle both waveform delivery and neural response measurement, consolidating components and simplifying the overall device architecture while achieving real-time adaptive capability.
3Object-generated harmful factors
If pre-pulse waveforms are used to suppress neural responses, then side effects are minimized, but energy consumption increases due to additional waveform components
Solution Approach 1:
A pre-pulse waveform is applied before the main stimulation pulse to precondition the neural tissue. This preliminary action suppresses unwanted neural responses or raises the activation threshold, thereby minimizing side effects such as muscle contractions or paresthesia before they can occur during the primary stimulation phase.
Solution Approach 2:
The stimulation waveform is structured as a periodic sequence consisting of a pre-pulse phase followed by a main pulse phase. This periodic structure allows the system to repeatedly apply the suppressive pre-pulse before each therapeutic stimulus, maintaining control over neural responses throughout continuous stimulation while managing energy delivery in discrete controlled intervals.
Data Source
AI summary
Methods and systems for providing neuromodulation therapy are disclosed. The systems include an Implantable Pulse Generator (IPG) or External Trial Stimulator (ETS) that is capable of sensing an Evoked Compound Action Potential (ECAP), and (perhaps in conjunction with an external device) is capable of adjusting a stimulation program while based on the sensed ECAP. The stimulation program may include a pre-pulse component that may be adjusted based on the sensed ECAP. Moreover, stimulation may be applied to neural elements timed to coincide with the arrival of ECAPs at those neural elements. The stimulation may enhance or suppress activation of those neural elements.