DREZ Microcoagulation for Spinal Cord Injury Pain
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Solution Overview
Problem
Severe or disabling chronic pain resulting from spinal cord injury is notoriously difficult to treat, with existing surgical techniques providing modest relief, especially for pain perceived below the level of injury, and there is a need for more effective methods to identify and modify dorsal root entry zones (DREZs) involved in pain signal generation.
Innovation Solution
A somatotopic map is created to correlate perceived pain with aberrant DREZs, using neuroelectrical activity measurements and transcutaneous C-fiber stimulation to identify pain-generating DREZs, followed by targeted microcoagulation to minimize pain, thereby providing a more precise and effective treatment approach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If empiric techniques are used to target DREZ sites for surgical treatment, then the treatment procedure is simple, but the pain relief effectiveness is modest (only about 50% of patients achieve good relief)
Solution Approach 1:
The patent applies preliminary action by performing intramedullary recordings to identify hyperactive DREZ sites before surgical treatment. This pre-identification step ensures that the subsequent microcoagulation procedure targets the correct pain-generating areas, thereby improving pain relief effectiveness while maintaining procedural simplicity through clear guidance.
Solution Approach 2:
The patent implements feedback by using intramedullary recordings to detect abnormal neuroelectric activity in DREZ sites. This feedback mechanism allows real-time identification of pain-generating areas during surgery, enabling precise targeting of microcoagulation to hyperactive sites, thus significantly improving treatment effectiveness compared to empiric approaches.
2Reliability
If DREZ lesioning is performed at the level of injury, then the surgical procedure is straightforward, but below-level pain responds poorly to treatment
Solution Approach 1:
The patent uses intramedullary recordings to provide real-time feedback on neuroelectric activity at different DREZ levels. This feedback enables identification of hyperactive sites that may be above, at, or below the level of injury, allowing precise targeting of below-level pain generators that empiric techniques miss.
Solution Approach 2:
The patent replaces the mechanical/empiric approach of targeting DREZ based on injury level with an electrophysiologic approach using intramedullary recordings. This substitution allows identification of functionally hyperactive DREZ sites regardless of their anatomical position relative to the injury, thereby improving below-level pain relief.
3Reliability
If standardized DREZ treatment protocols are used, then the treatment process is simple and consistent, but individual patient variations in pain perception and DREZ location are not accounted for
Solution Approach 1:
The patent applies preliminary action by creating a somatotopic map that correlates perceived pain locations with DREZ sites before treatment. This pre-planning step individualizes the treatment approach for each patient based on their specific pain pattern and DREZ hyperactivity, improving treatment effectiveness while keeping the actual surgical procedure straightforward.
Solution Approach 2:
The patent implements local quality by tailoring the treatment to each patient's specific pain-generating DREZ sites identified through intramedullary recordings and somatotopic mapping. Rather than applying a standardized protocol, the treatment is localized to the specific hyperactive areas responsible for each patient's pain, thereby improving individualized effectiveness.
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 method significantly improves pain relief for patients with spinal cord injuries, achieving high success rates in reducing central pain, particularly for below-level pain, which was previously poorly addressed by existing techniques, and enhances the quality of life for affected individuals.
Implementation Method 1
using neuroelectrical activity measurements and transcutaneous C-fiber stimulation to identify pain-generating DREZs
Implementation Method 2
followed by targeted microcoagulation to minimize pain
Data Source
AI summary
Methods are provided to reliably identify and surgically eradicate aberrant DREZ in patients suffering from spinal cord injury. The methods include identifying potential aberrant DREZ using a combination of mapping techniques based on the location of the patients perceived pain, analysis of the spontaneous electrical hyperactivity in targeted DREZ, and analysis of evoked transcutaneous C-fiber stimulation both in pre-operative and operative conditions. Methods are also provided for identifying potential pain effecters in aberrant DREZ, useful in the preparation of non-invasive therapeutics for central pain characteristic of spinal cord injury.