Percutaneous Tissue Excision with Dural Safety Zone for Spinal Stenosis
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Solution Overview
Problem
Existing spinal stenosis treatments, particularly those involving open surgery, cause significant pain, lengthy recovery times, and risk of nerve damage due to the invasive nature of stripping muscles and ligaments, while minimally invasive techniques are cumbersome and require general anesthesia.
Innovation Solution
A percutaneous minimally invasive ligament decompression (MILD) procedure that creates a safety zone by compressing the dural sac with an injectable medium to reduce the risk of spinal cord damage, using imaging techniques for precise tool placement, and employing tissue excision devices to remove portions of the thickened ligamentum flavum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If open laminectomy surgery is performed to remove thickened ligamentum flavum, then spinal stenosis is effectively treated, but patient experiences significant pain, lengthy recovery time, and risk of nerve damage due to invasive muscle and ligament stripping
Solution Approach 1:
The procedure segments the treatment into two distinct phases: first creating a safety zone by compressing the dural sac with injectable medium, then performing targeted ligamentum flavum excision. This segmentation allows the invasive excision to be performed safely without directly exposing the spinal cord, reducing nerve damage risk while maintaining treatment effectiveness.
Solution Approach 2:
The dural sac compression with injectable medium is performed as a preliminary action before ligamentum flavum excision. This creates a protective safety zone that cushions the spinal cord during the subsequent excision procedure, allowing surgeons to work more aggressively on removing thickened ligament without increasing nerve damage risk.
2Loss of time
If percutaneous minimally invasive technique is used for spinal decompression, then recovery time is shortened and pain is reduced, but the procedure becomes cumbersome and requires general anesthesia
Solution Approach 1:
An injectable medium serves as an intermediary substance that is introduced into the epidural space to compress the dural sac. This intermediary creates the necessary safety zone without requiring extensive surgical exposure, enabling minimally invasive percutaneous access while maintaining patient safety. The medium acts as a buffer that simplifies the overall procedure complexity.
3Reliability
If dural sac is compressed with injectable medium to create safety zone, then risk of spinal cord damage is reduced, but procedure complexity increases
Solution Approach 1:
The procedure replaces complex mechanical surgical exposure and protection methods with a simpler chemical/physical approach using injectable compressive medium. Instead of requiring extensive dissection and manual protection of the spinal cord, the medium provides automatic cushioning through its compressible nature, reducing procedure complexity while enhancing safety.
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
Reduces the risk of nerve damage and shortens recovery time by allowing spinal decompression with local anesthesia, providing clearer imaging for precise tool placement and safer excision of ligamentum flavum, thus alleviating spinal stenosis symptoms.
Implementation Method 1
creating a safety zone by compressing the dural sac with an injectable medium
Data Source
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AI summary
A kit for treating spinal stenosis is disclosed, the kit comprising: a cannula having a distal portion configured to be inserted along a generally anterior trajectory across interlaminar space between lamina of adjacent vertebra to a first location external to an epidural space; a tissue excision device having a distal portion configured to be inserted through the cannula to a second location external to the epidural space; wherein the distal portion of the tissue excision device is visualized at the second location using imaging means; wherein the tissue excision device is configured to excise and remove tissue about the second location, which decompresses the spinal stenosis.