VHF Neurostimulation Thermal Management via Feedback Control
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Solution Overview
Problem
Current neurostimulation systems face challenges in safely and effectively delivering very-high-frequency (VHF) stimuli due to issues with tissue heating and managing thermal effects, which can lead to unwanted biological responses.
Innovation Solution
The system incorporates sensors for temperature monitoring, a stimulation control circuit that adjusts parameters based on temperature data, and thermal management features like heat dissipators and coolant circulation paths to prevent excessive tissue heating and ensure safe energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If very-high-frequency neurostimulation is delivered to achieve therapeutic efficacy, then the stimulation effectiveness is improved, but tissue heating occurs causing safety concerns
Solution Approach 1:
The patent implements a feedback control system where temperature sensors continuously monitor tissue temperature during VHF neurostimulation delivery. The stimulation control circuit receives temperature data and dynamically adjusts stimulation parameters (amplitude, pulse width, frequency) to maintain therapeutic efficacy while preventing tissue heating from exceeding safe thresholds. This closed-loop feedback mechanism resolves the contradiction by enabling real-time adaptation of stimulation delivery based on actual tissue thermal conditions.
Solution Approach 2:
The system employs dynamic parameter adjustment where stimulation characteristics are not fixed but continuously adapted during delivery. The stimulation control circuit modifies amplitude, pulse width, and frequency parameters in real-time based on temperature feedback, allowing the system to optimize therapeutic effect while preventing harmful thermal accumulation. This dynamic approach enables the system to operate safely within varying thermal conditions.
2Object-affected harmful factors
If temperature monitoring and thermal management systems are added to prevent tissue heating, then patient safety is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into existing neurostimulation system components. Temperature sensors are incorporated into the lead or electrode structure, serving both as part of the stimulation delivery system and as thermal monitoring elements. The stimulation control circuit performs both its primary function of controlling VHF stimulation delivery and the additional function of processing temperature data and adjusting parameters accordingly. This multi-functionality approach minimizes the addition of separate dedicated thermal management components, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The system merges the thermal management function with the existing neurostimulation control architecture. Temperature sensing, monitoring, and control functions are combined within the existing stimulation control circuit rather than implementing a completely separate thermal management system. This integration approach reduces the number of discrete components and simplifies the overall system architecture while still providing comprehensive thermal management capabilities.
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
This approach allows for controlled and safe delivery of VHF neurostimulation, preventing tissue overheating and maintaining therapeutic efficacy by dynamically adjusting stimulation parameters and utilizing thermal management systems.
Implementation Method 1
The one or more sensors may be configured to be placed in the patient to sense a measure of tissue heating caused by the delivery of the neurostimulation
Implementation Method 2
The thermal management device is configured to provide a thermal conductive path for a portion of a thermal energy causing the tissue heating to be dissipated through at least the one or more heat dissipators
Implementation Method 3
The stimulation output circuit may be configured to deliver the neurostimulation... The dosage may include an amount of at least one of an electrical energy or electrical charge injected in to the tissue
Data Source
AI summary
An example a neurostimulation system may include one or more sensors configured to sense a measure of tissue heating caused by neurostimulation, a stimulation output circuit configured to deliver the neurostimulation, and a stimulation control circuit configured to control the delivery of the neurostimulation using stimulation parameters. The stimulation control circuit may include temperature sensing circuitry and stimulation parameter circuitry. The temperature sensing circuitry may be configured to receive the measure of tissue heating and to determine a temperature parameter representing a temperature or a temperature change using the received measure of tissue heating. The stimulation parameter circuitry may be configured to adjust the stimulation parameters using the temperature parameter and to adjust the stimulation parameters to limit a dosage (energy or charge) based on an operational capability of the stimulation output circuit and the power management circuit and a safety limit related to tissue heating.