Spinal Cord Modulation via Periodic Pulse Packets for Gait and Pain
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Solution Overview
Problem
Conventional spinal cord stimulation therapies for patients with injuries often fail to effectively improve motor function, particularly gait, due to limitations in electrical signal delivery and parameter optimization.
Innovation Solution
The use of a spinal cord modulation system that delivers therapy signals with packets of pulses, featuring distinct frequency and amplitude parameters in separate periods to target both motor function improvement and pain relief, utilizing implantable signal generators and leads positioned strategically along the spinal cord to provide precise neural modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spinal cord stimulation therapy is used to treat pain, then pain relief is achieved through paresthesia, but motor function improvement is insufficient
Solution Approach 1:
The patent applies periodic action by using pulse packets with specific timing patterns - delivering bursts of high-frequency pulses at low-frequency intervals. This periodic structure allows the system to achieve both pain relief (during high-frequency bursts) and motor function improvement (through rhythmic patterned stimulation), resolving the contradiction between pain management and motor recovery
Solution Approach 2:
The patent employs parameter changes by varying pulse frequency, amplitude, and duration dynamically. Specifically, it uses high-frequency pulses (100-500 Hz) for pain relief and low-frequency pulses (1-100 Hz) for motor function improvement. This dynamic parameter adjustment allows the system to optimize both pain relief and motor recovery simultaneously
2Reliability
If high-frequency pulses are delivered for pain relief, then paresthesia is generated, but motor function enhancement is limited
Solution Approach 1:
The patent applies segmentation by dividing the stimulation into distinct temporal segments - high-frequency pulse bursts for pain relief separated by low-frequency intervals for motor function. This segmentation allows independent optimization of pain management and gait improvement without interference between the two therapeutic goals
3Device complexity
If conventional electrical stimulation parameters are used, then simple signal delivery is maintained, but therapeutic outcomes are suboptimal
Solution Approach 1:
The patent applies dynamics by implementing adaptive, programmable stimulation parameters that can be adjusted based on patient response and therapeutic needs. The system dynamically modifies pulse frequency, amplitude, and packet timing to optimize both pain relief and motor function improvement, moving beyond fixed conventional parameters
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 significantly enhances gait smoothness and proprioception, while also providing paresthesia-free pain relief, outperforming conventional techniques by optimizing signal delivery and parameter selection based on patient feedback.
Implementation Method 1
Implantable neurological stimulation systems generally have an implantable signal generator and one or more leads that deliver electrical pulses to neurological tissue or muscle tissue
Data Source
AI summary
Improving motor function in spinal cord injury patients (among others) via electrical stimulation, and associated systems and methods are disclosed. A representative method includes, in a patient having a spinal cord injury, improving the patient's gait response by delivering an electrical signal that includes repeating pulse packets delivered at a first frequency of from 2 Hz to 200 Hz. The electrical signal is delivered from an epidural location at the patient's spinal cord, and the individual pulse packets include a first period during which pulses are delivered at a first frequency of from 1 kHz to 5 kHz and a first pulse width of from 80 microseconds to 400 microseconds and a first amplitude from 0.1 mA to 20 mA, followed by a second period during which pulses are (a) not delivered, or (b) delivered at a second frequency higher than the first frequency, and/or a second pulse width shorter than the first pulse width, and/or a second amplitude less than the first amplitude.