Optical Fiber Sensor for Spinal Cord Stimulation Position Tracking
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Solution Overview
Problem
Existing spinal cord stimulation technologies fail to accurately adjust for patient movement, leading to inconsistent pain relief and inefficient battery usage due to the lack of automatic adjustment mechanisms.
Innovation Solution
A novel optical sensor system that uses near-infrared reflectometry to detect changes in spinal cord position and orientation, adjusting current pulse parameters in real-time to maintain consistent stimulation, thereby compensating for patient movement and recalibrating when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If spinal cord stimulation uses a fixed electrode array position, then the device structure is simple and easy to implant, but the stimulation consistency deteriorates due to patient movement
Solution Approach 1:
The patent implements dynamic adjustment of stimulation parameters based on real-time detection of spinal cord position changes. The system continuously monitors the relative position between the electrode array and spinal cord, and automatically adjusts stimulation parameters to compensate for movement, transforming a static system into a dynamic adaptive one that maintains stimulation consistency despite patient movement.
Solution Approach 2:
The patent employs a feedback mechanism where the system detects changes in spinal cord position or electrode-spinal cord distance and uses this information to adjust stimulation parameters. This closed-loop control ensures that stimulation effectiveness is maintained even when the anatomical relationship changes due to patient movement, breathing, or other physiological processes.
2Stability of the object's composition
If spinal cord stimulation continuously adjusts for patient movement, then the stimulation consistency is improved, but the battery power consumption increases
Solution Approach 1:
The patent implements periodic monitoring and adjustment of stimulation parameters rather than continuous adjustment. The system monitors for changes in spinal cord position or electrode-spinal cord distance and adjusts parameters only when changes are detected, using periodic sampling to balance stimulation consistency with energy conservation. This approach reduces unnecessary adjustments and conserves battery power while maintaining therapeutic effectiveness.
Solution Approach 2:
The patent applies adjustment only when and where necessary - specifically when patient movement or physiological changes affect the electrode-spinal cord relationship. Rather than continuously adjusting all parameters, the system selectively adjusts stimulation parameters based on detected changes, minimizing energy consumption while maintaining stimulation consistency when needed.
3Adaptability or versatility
If spinal cord stimulation uses manual adjustment, then the device complexity is low, but the adaptability to patient movement deteriorates
Solution Approach 1:
The patent implements a self-adjusting system where the spinal cord stimulation device automatically detects and compensates for patient movement without requiring manual intervention. The system monitors changes in spinal cord position or electrode-spinal cord distance and autonomously adjusts stimulation parameters, enabling the device to serve itself and adapt to changing conditions without external control.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated sensing and control system. Instead of requiring physical repositioning of electrodes or manual parameter changes, the system uses sensors to detect position changes and electronically adjusts stimulation parameters, substituting mechanical intervention with automated control based on real-time physiological feedback.
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 solution ensures consistent paresthesia and conserves battery power by automatically adjusting spinal cord stimulation based on patient movement, maintaining effective pain relief and optimizing energy usage.
Implementation Method 1
A novel optical sensor system that uses near-infrared reflectometry to detect changes in spinal cord position and orientation
Implementation Method 2
uses near-infrared reflectometry to detect changes in spinal cord position and orientation
Data Source
AI summary
A positionally sensitive spinal cord stimulation apparatus and method using near-infrared (NIR) reflectometry are provided for automatic adjustments of spinal cord stimulation. The system comprises an electrode assembly with an integrated optical fiber sensor for sensing spinal cord position. The integrated optical fiber sensor, comprising a pair of optical elements for emitting light from an IR emitter and for collecting reflected light into a photodetector, determines a set of measured photocurrents. As the spinal cord changes position, the angles of incidence for light from the IR emitter and the measured optical intensities change. Electrode pulse characteristics are adjusted in real time, based on the set of measured optical intensities, to minimize changes in stimulation perceived by the patient during motion. The system includes automatic calibration of the optical fiber sensor when the patient is at rest, and a patient orientation detection.