Translaminar Ligament Decompression via Dural Sac Compression

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Solution Overview

Problem

Current minimally invasive spinal procedures for treating spinal stenosis are limited by the risk of damaging the dural sac and spinal nerves, require general anesthesia, and result in significant post-operative pain and instability due to the tearing of muscles and ligaments during open surgery.

Innovation Solution

The method involves creating a safety zone by compressing the dural sac using a fluid injection to establish a working zone, allowing for percutaneous access and tissue removal tools to be used to reduce stenosis without crossing the median plane, thereby minimizing the risk of nerve damage and preserving stabilizing structures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If open laminectomy is performed to remove thickened ligamentum flavum, then spinal stenosis is effectively treated, but significant post-operative pain and instability occur due to tearing of muscles and ligaments

Engineering Contradiction:

Improveeffectiveness of stenosis treatmentVSAvoidpost-operative pain and instability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The procedure segments the treatment by creating separate working zones for each side of the spine, accessing ligamentum flavum through unilateral percutaneous punctures rather than bilateral open exposure. This allows targeted removal of thickened ligament tissue without requiring extensive muscle detachment and ligament disruption, thereby treating stenosis effectively while minimizing trauma to stabilizing structures

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The procedure extracts only the necessary portion of thickened ligamentum flavum through percutaneous tissue removal tools (such as radiofrequency ablation or mechanical resection) rather than performing a full laminectomy. This selective extraction achieves decompression of the spinal canal while preserving the integrity of the laminae and surrounding musculature, avoiding the post-operative instability and pain associated with extensive open surgery

Inventive Principle:

Principle #2Taking out (Extraction)

2Loss of time

If conventional minimally invasive procedures are used, then post-operative recovery is improved, but the risk of damaging the dural sac and spinal nerves increases

Engineering Contradiction:

Improverecovery timeVSAvoidsafety of neural structures

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The procedure performs preliminary compression of the dural sac using a balloon catheter before tissue removal. This compression creates a safety zone between the dural sac and the working area, allowing subsequent percutaneous access and ligament removal to proceed safely without risking neural structure damage. The preliminary action of dural sac compression enables minimally invasive treatment while maintaining high safety standards

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The dural sac compression device acts as an intermediary structure that separates the neural elements from the surgical working zone. By compressing the dural sac laterally, it creates a protective buffer zone that allows tissue removal tools to operate adjacent to the spinal canal without directly threatening the dural sac or nerve roots, thus enabling safe minimally invasive treatment

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If general anesthesia is administered for spinal procedures, then complete muscle relaxation is achieved, but post-operative pain and recovery time increase

Engineering Contradiction:

Improvemuscle relaxation during surgeryVSAvoidrecovery time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The procedure replaces the pharmacological mechanism of general anesthesia with a mechanical approach using percutaneous muscle blocking agents injected near the paraspinal muscles. This substitution allows adequate muscle relaxation for the minimally invasive procedure while avoiding the systemic effects and extended recovery associated with general anesthesia, enabling same-day discharge and faster return to normal activities

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 reduces the risk of spinal cord and nerve damage, allows for local anesthesia, and decreases post-operative pain and recovery time, providing a safer and more effective minimally invasive treatment for spinal stenosis.

Implementation Method 1

compressing the dural sac by injecting a fluid to form a safety zone

Methodology Applied

Scientific EffectFluid pressure: Pressure Increase

Data Source

PatentUS8734477B2Translaminar approach to minimally invasive ligament decompression procedure

Publication Date: 2014.05.27 VERTOS MEDICAL INC

AI summary

Provided herein is a method for treating spinal stenosis comprising percutaneously accessing the epidural space from a first side of the spine. The first side of the spine is located on one side of the medial plane with respect to the spinal cord. A tissue removal tool is then advanced through the first side of the epidural space into the other side of the epidural space, where the other side of the epidural space is located on the other side of the medial plane of the spinal cord. Once the tissue removal tool is located on the second side of the medial plane, stenosis can be reduced using the tissue removal tool.