Percutaneous Spinal Cross Link Connector
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Solution Overview
Problem
Current minimally invasive spinal fusion implantation techniques require further improvement for more efficient and stable fixation of cross bars to spinal fusion constructs, as existing methods can be cumbersome and invasive, affecting the stability and rigidity of the spinal fusion construct.
Innovation Solution
A connector system with a rod receiving portion and a cross bar receiving portion, where the cross bar receiving portion is defined between two arms with inwardly facing threads, allowing for perpendicular orientation of the cross bar, and a cannula with detachable blades for minimally invasive pathway creation, along with a dilator and drill for precise placement and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If percutaneous access devices are used to insert spinal rods through individual incisions, then invasiveness is reduced, but the stability and rigidity of the spinal fusion construct is compromised
Solution Approach 1:
The spinal fusion construct is segmented into multiple components: pedicle screws inserted through individual percutaneous incisions, spinal rods connecting the screws, and cross bars providing additional stabilization. This segmentation allows minimally invasive insertion while maintaining overall construct integrity through the distributed network of fixed elements.
Solution Approach 2:
The invention adds a third dimension to the spinal fusion construct by introducing cross bars that extend perpendicular to the longitudinal axis of the spinal rods. This cross-linking in the transverse dimension creates a three-dimensional framework that significantly enhances the rigidity and stability of the construct while maintaining percutaneous insertion benefits.
2Strength
If cross bars are added to enhance stability of spinal fusion constructs, then rigidity is improved, but device complexity increases
Solution Approach 1:
The connector serves multiple functions: it attaches the cross bar to the spinal rod, provides threading for secure fixation, and integrates with the existing percutaneous access system. This multi-functionality reduces the need for separate components and simplifies the overall system despite adding cross-bar stabilization.
Solution Approach 2:
The cross bar is received within a receptacle formed by arms on the connector, creating a nested structure where the cross bar fits inside the connector assembly. This nesting approach consolidates multiple elements into compact arrangements, reducing spatial complexity while maintaining structural integrity.
3Reliability
If threaded blockers are used to secure cross bars, then fixation stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The threaded blocker utilizes threading parameters (pitch, depth, profile) that are optimized to provide secure fixation while accommodating reasonable manufacturing tolerances. The threading geometry is designed to engage reliably without requiring ultra-precise manufacturing, balancing fixation stability with manufacturability.
Data Source
AI summary
A percutaneous spinal cross link system for interconnecting a spinal fusion construct on one side of the longitudinal axis of the spine with a spinal fusion construct on the other side of the longitudinal axis may include a cross bar connected at each end by a respective connector to a respective spinal fusion rod of each of the spinal fusion constructs. The connector may include a rod receiving portion adapted to receive one of the spinal fusion rods and a cross bar receiving portion adapted to receive the cross bar in an orientation generally perpendicular to the spinal fusion rod. A cannula defined by two spaced apart blades may be connected to the connector for defining a minimally invasive pathway through body tissue for introduction of the cross bar to the connector. Other tools for use with the system are also disclosed.