Facet Joint Implant Crosslinking Apparatus for Spinal Stabilization
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Solution Overview
Problem
Existing orthopedic implant stabilization methods face challenges in securely anchoring to limited bone mass, particularly in the spine, requiring systems that are easily installable, minimally invasive, and capable of adjustable displacement and positioning.
Innovation Solution
A crosslinking apparatus comprising implant coupling components, bolts, rod coupling components, and a rod that securely links inferior and superior facet joint implants, providing a rigid structure resistant to slippage and rotation, while allowing for discrete adjustment and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional anchoring methods are used to secure implants to bone, then implant stability is improved, but the requirement for bone mass increases
Solution Approach 1:
The crosslinking apparatus divides the stabilization function into multiple components: implant coupling components that attach to facet joint implants, a rod that connects these components, and bolts that secure the assembly. This segmentation allows distribution of stabilizing forces across multiple attachment points rather than relying on a single large anchor, thereby reducing the bone mass requirement while maintaining implant stability.
Solution Approach 2:
The crosslinking apparatus merges multiple facet joint implants into a unified stabilized structure by connecting them through a common rod system. This combining approach creates a collective stabilization mechanism where the rod acts as a shared anchor point, reducing the burden on individual bone attachment sites and allowing securement with limited bone mass.
2Stability of the object's composition
If rigid fixation is used to prevent implant displacement, then implant stability is improved, but the ability to adjust positioning is reduced
Solution Approach 1:
The crosslinking apparatus incorporates dynamic adjustment capabilities through threaded bolts that allow post-installation positioning adjustments. The system transitions from a purely rigid fixed state during installation to an adjustable state during optimization, and then to a locked rigid state for final stabilization. This dynamic process enables both positioning flexibility and final stability.
Solution Approach 2:
The system allows preliminary positioning and adjustment of implants before final securing. The bolt mechanism enables initial placement with adjustment capability, allowing surgeons to optimize implant positioning before locking the system into its rigid stabilized state. This preliminary adjustment phase resolves the contradiction by providing adaptability before final fixation.
3Stability of the object's composition
If complex crosslinking structures are used to prevent rotation and translation, then implant stability is improved, but the ease of installation is reduced
Solution Approach 1:
The crosslinking apparatus is divided into separate modular components: implant coupling components, a rod, and bolts. This segmentation allows each component to be independently prepared and positioned, simplifying the installation process compared to a single complex integrated structure. The modular nature enables step-by-step assembly that maintains stability while improving ease of installation.
Solution Approach 2:
The implant coupling components are designed to be pre-attached to the facet joint implants before the crosslinking structure is assembled. This preliminary action simplifies the main assembly process by reducing the number of steps required during surgery, as the coupling interfaces are already prepared and ready for connection to the rod and bolts.
Data Source
AI summary
A crosslink is provided for securing orthopedic implants, such as facet joint replacement implants, together. The crosslink has a pair of implant coupling components, a pair of rod coupling components, a rod, and a pair of fasteners. Each facet joint implant may include a semicylindrical interface received in a resilient member of the corresponding implant coupling component to permit relative cephalad/caudal adjustment between the crosslink and the implants. The resilient members grip the semicylindrical interface of the implant to enable at least temporary attachment of the implant coupling components to the implants independently of the rod. Clocking features on the semicylindrical interfaces and on the interfacing areas of the implant coupling components and rod coupling components may limit assembly of the crosslink to discrete relative orientations and prevent play after assembly. The fasteners secure the rod coupling components to the rod at the desired positions along the rod.