Bolus Stimulation Scheduling for Neurostimulation Tolerance Management
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Solution Overview
Problem
Current spinal cord stimulation systems lack effective management of stimulation use, leading to potential overuse and reduced therapy effectiveness due to patient self-administration without scheduled follow-ups, which can result in tolerance development and decreased pain relief.
Innovation Solution
Implementing a system that allows clinicians to prescribe and track stimulation therapy, providing patients with a set amount of stimulation and scheduling follow-ups, with external devices capable of monitoring and alerting for additional prescriptions, and adjusting stimulation parameters based on patient activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If patients self-administer stimulation therapy without scheduled follow-ups, then ease of operation is improved, but therapy effectiveness deteriorates due to overuse and tolerance development
Solution Approach 1:
The system incorporates feedback mechanisms through scheduled follow-up appointments and clinician monitoring that provide guidance on appropriate stimulation usage. The feedback loop includes patient self-reporting of pain levels and stimulation effectiveness, which triggers clinician review and adjusts therapy parameters to prevent overuse and tolerance development while maintaining ease of patient self-administration
Solution Approach 2:
The system implements preliminary action through pre-scheduled follow-up appointments and advance therapy planning. Clinicians establish stimulation parameters, usage guidelines, and monitoring schedules before treatment begins, enabling patients to self-administer effectively while preventing overuse through predetermined usage limits and review cycles
2Reliability
If continuous stimulation is provided without scheduled breaks, then therapy effectiveness is improved, but loss of energy increases due to prolonged stimulation duration
Solution Approach 1:
The system implements periodic action through scheduled bolus stimulations separated by off-times, replacing continuous stimulation with intermittent dosing. Each bolus provides concentrated pain relief during active periods, followed by energy-saving off-periods. This periodic pattern maintains therapeutic effectiveness during active phases while significantly reducing overall energy consumption compared to continuous stimulation
Solution Approach 2:
The system segments continuous stimulation into discrete bolus units with defined durations and intervals. Each bolus is a separate stimulation episode that can be independently controlled, allowing the system to provide intensive pain relief when needed while maintaining energy efficiency during off-periods between boluses
3Reliability
If stimulation parameters are adjusted frequently to optimize treatment, then therapy effectiveness is improved, but device complexity increases due to multiple parameter adjustments
Solution Approach 1:
The system implements dynamics through flexible, adaptive parameter adjustments that respond to patient feedback and clinical needs. Stimulation parameters such as amplitude, pulse width, and frequency can be dynamically modified between boluses based on patient response, pain levels, and treatment progress, allowing optimization without requiring complex real-time adjustment systems
Solution Approach 2:
The system employs parameter changes by modifying stimulation characteristics (amplitude, frequency, pulse width) to optimize treatment effectiveness. These parameter adjustments are made through controlled variations in stimulation delivery rather than complex system reconfiguration, maintaining device simplicity while achieving treatment optimization through targeted parameter modification
Data Source
AI summary
A method and external device for providing sub-perception stimulation to a patient via an implantable stimulator device is disclosed. Stimulation parameters for the patient are determined that provide sub-perception stimulation to address a symptom of the patient. A schedule is determined to provide scheduled boluses of stimulation, where each bolus comprises a duration during which stimulation is applied to the patient in accordance with the stimulation parameters, and where the scheduled boluses are separated by off times when no stimulation is provided to the patient. Preferably, the duration of each of the scheduled boluses is 3 minutes or longer, and the duration of each of the off times is 30 minutes or greater. Additional boluses can be provided on demand in addition to the scheduled boluses by selecting an option on the external device, although the provision of such additional boluses may be constrained by a lockout period.