Minimally Invasive Ligament Decompression via Thecal Sac Compression
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Solution Overview
Problem
Current treatments for spinal stenosis, such as open laminectomy, cause significant pain, damage to muscles and ligaments, and spinal instability due to the invasive nature of traditional surgery, and existing minimally invasive techniques are limited by the small size of the spinal canal and are often painful and require general anesthesia.
Innovation Solution
A minimally invasive ligament decompression (MILD) method and device using image guidance to create a safety zone by compressing the thecal sac with a fluid, allowing percutaneous access and tissue removal from the ligamentum flavum without damaging nearby tissues, using tools like cannulated scalpels and retractable anchors to expand the spinal canal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If open laminectomy is performed to remove thickened ligamentum flavum, then spinal stenosis is effectively treated and canal cross-sectional area is increased, but significant pain and damage to muscles and ligaments occurs and spinal instability develops
Solution Approach 1:
The procedure segments the approach into two distinct phases: first creating a safety zone by compressing the thecal sac with injectable material, then performing targeted tissue removal through percutaneous access. This segmentation allows the thickened ligamentum flavum to be removed without requiring extensive muscle stripping and ligament detachment, thereby treating spinal stenosis while minimizing damage to stabilizing structures
Solution Approach 2:
An intermediary substance (injectable material such as contrast medium or gel) is introduced to compress the thecal sac and create a safety zone. This intermediary allows safe percutaneous access to the ligamentum flavum through the compressed thecal sac without direct damage to surrounding muscles and ligaments, enabling tissue removal while preserving spinal stability
2Object-affected harmful factors
If percutaneous techniques are used to access the spinal canal, then less damage to muscles and ligaments occurs and recovery is faster, but the small size of the spinal canal makes the procedure difficult to perform
Solution Approach 1:
The thecal sac is compressed with injectable material before tissue removal to create a safety zone and working space. This preliminary action enlarges the effective working area within the spinal canal, making percutaneous tissue removal feasible and easier to perform while maintaining the benefits of minimal muscle and ligament damage
Solution Approach 2:
The physical state of the thecal sac is changed by introducing injectable material that alters its volume and pressure characteristics. This parameter change creates sufficient working space for tissue removal tools to operate effectively within the confined spinal canal, improving ease of operation while preserving the minimally invasive nature of the procedure
3Area of stationary object
If traditional open surgery is performed under general anesthesia, then complete access to the spine is achieved, but patients require five to seven days hospital admission and six weeks to three months recovery
Solution Approach 1:
The procedure extracts only the essential function of tissue removal while eliminating the need for extensive surgical exposure. By using percutaneous access through the compressed thecal sac, the thickened ligamentum flavum can be removed without requiring general anesthesia, extensive muscle stripping, or prolonged hospital admission, thereby reducing recovery time to a fraction of traditional surgery
Solution Approach 2:
The procedure applies local compression to the thecal sac at the specific treatment site rather than requiring global surgical exposure. This localized approach creates sufficient working space for tissue removal while avoiding the systemic effects of general anesthesia and extensive surgical trauma, enabling same-day discharge and rapid recovery
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 MILD method reduces the risk of spinal cord damage, minimizes pain, and achieves spinal decompression with faster recovery and reduced spinal instability by creating a safety zone for precise tissue removal and ligament retraction, improving nerve function and blood flow.
Implementation Method 1
compressing the thecal sac in the region of interest by injecting a fluid into the epidural space to form a safety zone
Data Source
AI summary
A method for treating stenosis in a spine comprises percutaneously accessing the epidural space in a stenotic region of interest, compressing the thecal sac in the region of interest to form a safety zone, inserting a tissue removal tool into tissue in the working zone, using the tool to percutaneously reduce the stenosis; and utilizing imaging to visualize the position of the tool during at least a part of the reduction step. A tissue excision system for performing percutaneous surgery, comprises a cannula comprising a tissue-penetrating member having a distal end defining an aperture on one side thereof, an occluding member slidably received on or in the cannula and closing the aperture when the occluding member is adjacent the cannula distal end, means for engaging adjacent tissue via the aperture, and cutting means for resecting a section of the engaged tissue.