Multi-Axial Anchor Assembly for Spinal Implant Alignment
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Solution Overview
Problem
Current orthopedic and spinal surgery systems lack multi-axial capabilities for secure attachment and stabilization of implants to vertebrae, limiting the flexibility and effectiveness of bone alignment and fusion procedures.
Innovation Solution
A multi-axial anchor assembly comprising an anchor member with a pivotally coupled coupling member, a post, and a crown, which allows for secure engagement and positioning of an elongate implant member, such as a plate or rod, to vertebrae, providing adjustable and stable fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional bone anchors with fixed attachment are used to secure plates to vertebrae, then the attachment strength is sufficient, but the adaptability and ease of operation are limited due to inability to adjust alignment
Solution Approach 1:
The anchor assembly incorporates a dynamic alignment adjustment mechanism that allows the plate to be positioned at multiple angles relative to the vertebrae. The coupling between the plate and anchor member enables rotational movement and angular adjustment, transforming a static fixed-attachment system into a dynamic adjustable system that adapts to various spinal alignment requirements.
Solution Approach 2:
The anchor assembly is divided into distinct functional segments: the anchor member for vertebral engagement, the coupling mechanism for alignment adjustment, and the plate for stabilization. This segmentation allows each component to perform its specific function independently while working together as an integrated system, enabling alignment adjustment without compromising attachment strength.
2Ease of operation
If multi-axial capabilities are added to anchor assemblies for flexible positioning, then the ease of operation and adaptability improve, but the device complexity increases
Solution Approach 1:
The coupling mechanism provides dynamic positioning flexibility through controlled movement capabilities. It allows the plate to be positioned in multiple axes and angles during installation, then locks into a stable configuration once the desired alignment is achieved, maintaining ease of operation while enabling multi-axial adjustment.
Solution Approach 2:
The alignment adjustment mechanism enables changes in positional parameters (angle, orientation, depth) during the surgical procedure. By allowing adjustment of these parameters before final securing, the system provides positioning flexibility without requiring complex real-time adjustments during patient positioning or surgical approach.
3Adaptability or versatility
If adjustable alignment mechanisms are incorporated into anchor assemblies, then the manufacturing precision requirements increase, but the adaptability improves
Solution Approach 1:
The coupling mechanism is designed with inherent mechanical tolerances that accommodate manufacturing variations while maintaining functional alignment adjustment capability. The dynamic adjustment range is engineered to compensate for normal manufacturing tolerances, allowing adaptability without requiring ultra-precise manufacturing that would increase costs and complexity.
Solution Approach 2:
The coupling mechanism serves multiple functions: it provides alignment adjustment, maintains secure connection between plate and anchor, and accommodates manufacturing tolerances. This multi-functionality is achieved through a unified design that integrates these capabilities into a single mechanism, reducing the need for multiple precision components.
Data Source
AI summary
System and methods are provided that include a plate member engageable to the spinal column with an anchor assembly. The anchor assembly includes a coupling member having a post extending through at least one opening of the plate member and an anchor member pivotally captured in a receiver member of the coupling member below a lower surface of the plate member. A locking member secures the plate member to the coupling member.