Linked Bilateral Spinal Facet Implants for Pain Relief
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Solution Overview
Problem
Current spinal facet replacement technologies do not adequately address the need for high mobility and pain relief while minimizing patient discomfort, as they often rely on complex anatomical surfaces and may not effectively remove the source of arthritic or traumatic pain.
Innovation Solution
A vertebral facet replacement device that replaces both cartilage and a portion of the bone, providing a precise press fit and optional porous coating for bone ingrowth, allowing for improved attachment and pain removal by resecting affected facet bone structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If artificial disc replacement is performed to restore range of motion, then mobility is improved, but pain relief is insufficient when facet joints are affected
Solution Approach 1:
The solution segments the treatment into two distinct components: artificial disc replacement for the intervertebral disc and facet joint replacement for the posterior elements. This segmentation allows each component to address its specific functional requirement independently, ensuring both mobility restoration and pain relief from facet joint pathology.
Solution Approach 2:
The invention merges two previously separate surgical interventions (disc replacement and facet joint replacement) into a coordinated treatment approach. By combining these procedures, the system simultaneously addresses both anterior and posterior spinal elements, achieving comprehensive pain relief while preserving mobility.
2Strength
If facet joints are preserved to maintain spinal stability, then structural support is improved, but arthritic pain persists
Solution Approach 1:
The invention extracts only the diseased cartilage and superficial bone from the facet joint while preserving the underlying healthy bone structure. This selective removal eliminates the source of arthritic pain while maintaining the structural framework necessary for spinal stability.
Solution Approach 2:
The solution applies local quality changes by replacing only the damaged articular surfaces with prosthetic components while leaving the healthy bone and structural elements intact. This localized intervention targets the painful arthritic changes without compromising overall joint stability.
3Adaptability or versatility
If complex anatomical surfaces are used for implant attachment, then anatomical fidelity is improved, but manufacturing and positioning precision deteriorate
Solution Approach 1:
The invention employs spherical or hemispherical articulating surfaces for the facet joint implants. This geometric simplification transforms the complex natural facet anatomy into standardized spherical interfaces that are easier to manufacture with high precision and simpler to position accurately during surgery, while still providing appropriate articulation.
Solution Approach 2:
The solution changes the geometric parameters of the implant surfaces from complex variable curvature anatomical shapes to simplified spherical geometries with defined radii. This parameter standardization enables precise manufacturing using conventional methods and facilitates accurate positioning through geometric matching rather than complex anatomical conforming.
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 solution enables full restoration of natural spinal biomechanics, eliminating pain and restoring range of motion, with improved attachment and long-term fixation strength, addressing the limitations of prior art by providing a holistic solution for facet and disc replacements.
Implementation Method 1
optional porous coating for bone ingrowth
Data Source
AI summary
Superior and/or inferior facets of one or more facet joints may be replaced by superior and/or inferior facet joint prostheses. In one embodiment, a kit of superior or inferior prostheses is provided, in which the prostheses have at least two dimensions that vary among members of the kit independently of each other. Each prosthesis may have a bone engaging surface having a surface that is polyaxially rotatable against a corresponding resection of a vertebra. Each prosthesis may also have an articulating surface shaped such that, after attachment to the spine, the replaced or partially replaced facet joints provide a larger medial-lateral range of motion when the spine is flexed than when the spine is extended. Crosslinks may be used to connect left and right prosthesis together in such a manner that they are stabilized in a position in which they are seated directly against the vertebra.