Transcranial Electrical Stimulation for Sleep Induction
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Solution Overview
Problem
Current treatments for insomnia often rely on medications that carry risks of dependency and interactions with other medications, making it desirable to explore alternative methods for inducing sleep.
Innovation Solution
A non-therapeutic system and method using transcranial electrical stimulation (tES) with a device worn before bedtime, applying a slow time-varying current between 0.5 Hz and 4 Hz, and optionally combining with sensory stimulation modulated at the same or harmonic frequencies, to synchronize neural activity and promote sleep.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If medications such as benzodiazepines and zolpidem are used to induce sleep, then sleep induction effectiveness is improved, but the risk of psychological or physical dependency increases
Solution Approach 1:
The patent replaces pharmacological interventions (chemical system) with transcranial electrical stimulation (physical system). The tES device applies controlled electrical currents to specific brain regions to induce sleep, substituting the chemical mechanism of medications with a physical stimulation approach that avoids dependency risks while maintaining sleep induction effectiveness
Solution Approach 2:
The patent utilizes controlled variation of electrical stimulation parameters (frequency, amplitude, duration) to achieve sleep induction. By adjusting these physical parameters of the electrical stimulus, the system can effectively induce sleep without the fixed chemical composition of medications, allowing flexible optimization while avoiding pharmacological side effects
2Loss of time
If medications such as melatonin are used to induce sleep, then sleep onset time is reduced, but the effect duration is limited to about 15 minutes
Solution Approach 1:
The patent employs continuous or repeated electrical stimulation sessions that can be extended in duration, unlike the transient 15-minute effect of melatonin. The tES system can maintain stimulation over extended periods, providing sustained sleep induction effect that continues throughout the intended sleep period rather than having a brief window of effectiveness
3Object-affected harmful factors
If transcranial electrical stimulation is applied to synchronize neural activity, then medication-free sleep induction is achieved, but the device complexity increases
Solution Approach 1:
The patent divides the headgear into separate functional modules: electrode arrays for electrical stimulation, sensors for neural activity detection, and control circuitry for signal processing. This segmentation allows each component to perform its specific function independently, making the overall complex system more manageable and potentially easier to manufacture and maintain
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 effectively induces sleep by synchronizing neural activity with brain states during sleep, providing a medication-free alternative that reduces the risks associated with traditional sleep-inducing medications.
Implementation Method 1
The present disclosure relates to systems and non-therapeutic methods for inducing sleep using a time-varying electrical current (transcranial electrical stimulation, or tES) applied to the head of an awake individual
Data Source
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AI summary
A sleep induction device includes a headband, multiple transcranial stimulation electrodes, and control electronics to drive the electrodes. The sleep induction device may be worn by an awake user prior to attempting sleep. The control electronics are configured to cause the stimulation electrodes to emit a sequence of stimulation waveforms separated by interstimulus periods. The stimulation waveforms may have the characteristics of low-delta waveforms that may characterize non-REM stage 3 sleep. The stimulation period may last from about 4-8 seconds and the interstimulus period may last from about 10 to 30 seconds. A sleep induction session may include multiple alternating stimulation and non-stimulation periods. The sleep induction session may last for about 5 minutes to about 30 minutes.