Adaptive TENS Therapy via Sleep Stage Detection
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Solution Overview
Problem
Conventional Transcutaneous Electrical Nerve Stimulation (TENS) devices are not designed for use during sleep due to cumbersome leads and potential skin issues, limiting their effectiveness in providing pain relief at night, which is crucial for improving sleep quality for chronic pain sufferers.
Innovation Solution
A TENS device with a novel design that includes a three-axis accelerometer and gyroscope for continuous sleep detection, allowing adaptive adjustment of stimulation parameters based on sleep characteristics, such as leg orientation and motion, to ensure effective pain relief without disturbing sleep.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TENS devices are used during sleep, then pain relief can be provided, but the device causes skin irritation and disturbs sleep due to cumbersome leads and excessive stimulation intensity
Solution Approach 1:
The TENS device dynamically adjusts stimulation parameters based on real-time sleep stage detection. During REM sleep, stimulation is reduced or paused to prevent sleep disturbance, while during non-REM sleep, stimulation is maintained at therapeutic levels for pain relief. This dynamic adaptation resolves the contradiction between providing effective pain relief and avoiding sleep disturbance.
Solution Approach 2:
The device incorporates sleep stage detection feedback to continuously monitor the user's sleep state and adjust stimulation parameters accordingly. This feedback loop ensures that stimulation intensity is optimized for pain relief during appropriate sleep stages while automatically reducing or pausing stimulation during REM sleep to prevent disturbance, thereby eliminating skin irritation and sleep disruption caused by conventional static TENS devices.
2Reliability
If TENS stimulation intensity is increased to ensure effective pain relief, then pain management improves, but sleep quality deteriorates due to disturbance of natural sleep patterns
Solution Approach 1:
The device employs dynamic stimulation parameter adjustment based on detected sleep stages. During non-REM sleep when pain relief is most beneficial and least likely to disturb natural sleep patterns, stimulation intensity is optimized for effective pain management. During REM sleep when natural sleep patterns are most vulnerable to disturbance, stimulation is automatically reduced or paused, thus maintaining sleep quality while ensuring effective pain relief during appropriate periods.
3Reliability
If continuous TENS stimulation is applied throughout the night, then pain relief is maintained, but skin irritation increases due to prolonged electrode contact
Solution Approach 1:
The TENS device implements periodic stimulation patterns synchronized with sleep stages rather than continuous stimulation. Stimulation is applied during non-REM sleep periods when therapeutic benefit is maximized and paused during REM sleep periods, creating a rhythmic on-off pattern that maintains continuous pain relief coverage while reducing cumulative electrode-skin contact time, thereby preventing skin irritation.
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 device provides personalized and effective TENS therapy during sleep, enhancing pain management and sleep quality by dynamically adjusting stimulation intensity and duration based on real-time sleep analysis, thereby improving overall user experience.
Implementation Method 1
a three-axis accelerometer and gyroscope for continuous sleep detection
Implementation Method 2
a three-axis accelerometer and gyroscope for continuous sleep detection
Implementation Method 3
Transcutaneous electrical nerve stimulation (TENS) devices provide pain relief by stimulating sensory nerves
Data Source
AI summary
Apparatus for providing transcutaneous electrical nerve stimulation (TENS) therapy to a user, said apparatus comprising: a housing; an application unit for providing mechanical coupling between the housing and the user's body; a stimulation unit for electrically stimulating at least one nerve of the user; a sensing unit for (i) sensing the user's body movement and body orientation to determine whether the user is in an “out-of-bed” state or a “rest-in-bed” state, and (ii) analyzing the sleep characteristics of the user during the “rest-in-bed” state; and a feedback unit for at least one of (i) providing the user with feedback in response to the analysis of the sleep characteristics of the user, and (ii) modifying the electrical stimulation provided to the user by the stimulation unit in response to the analysis of the sleep characteristics of the user; wherein the sleep characteristics comprise a likelihood measure of the user's sleep quality.