Interlaminar Hook Spinal Distraction Device
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Solution Overview
Problem
Existing medical devices for treating spinal stenosis often damage fragile spinous processes or fail to provide lasting relief due to the softness of these components, leading to recurrence of stenosis symptoms.
Innovation Solution
Medical apparatuses that distract vertebral components such as laminae to increase space between vertebrae, using biocompatible materials like titanium, stainless steel, or polymers, with various support configurations like hooks and pegs to accommodate different vertebral structures, and optionally include arms and wings for stabilization without securing to the spine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices exert force on spinous processes to create space, then spinal stenosis symptoms are relieved, but the fragile spinous processes are damaged or fractured
Solution Approach 1:
The patent introduces an intermediary structure (the medical device with supports) that transfers the distraction force from the spinous processes to the laminae. The supports engage the laminae at broader, more robust surfaces, acting as a mediator that protects the fragile spinous processes while still achieving the therapeutic distraction effect.
Solution Approach 2:
The invention shifts the point of force application from a vertical dimension (direct compression of spinous processes) to a lateral dimension (engagement with laminae). By contacting the laminae at their superior and inferior edges, the device distributes forces across a different anatomical plane, reducing stress concentration on the spinous processes.
2Reliability
If devices distract spinous processes to increase space, then pressure on spinal cord is reduced, but the softer spinous process yields to the device leading to recurrence of stenosis
Solution Approach 1:
The device serves as a stable intermediary that maintains the distracted position by engaging the more rigid laminae rather than the softer spinous processes. The laminae provide a sturdier anchoring point that prevents the spinous processes from yielding back to their original compressed state.
Solution Approach 2:
The invention changes the physical parameters of force distribution by increasing the surface area of contact and shifting to a harder anatomical structure (laminae). This parameter change prevents the spinous processes from deforming under the distraction force, maintaining stable spacing over time.
3Ease of operation
If devices are secured to the spine for stabilization, then positioning is improved, but the fragile spinous processes are more susceptible to damage
Solution Approach 1:
The supports act as intermediaries that provide stabilization without direct attachment to the spinous processes. By engaging the laminae, which are more robust structures, the device achieves secure positioning while the spinous processes remain undisturbed and protected from damage.
Data Source
AI summary
A medical apparatus for alleviating the symptoms associated with spinal stenosis have a body including first and second supports disposed along the length of the body. The first support is configured to accommodate at least a portion of a vertebral component of a first vertebra disposed above or below a second vertebra. The second support is configured to accommodate at least a portion of a vertebral component of the second vertebra. The distance between the supports is sufficient to increase the space between the first vertebra and the second vertebra. Methods for using the apparatus include implanting the apparatus into a subject.