Sacroiliac Joint Fixation with Threaded Compression Anchor
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Solution Overview
Problem
Existing bone fixation systems for the sacroiliac joint often cause significant trauma to nerves, blood vessels, and muscle groups, and fail to adjust compression between the sacrum and iliac bones during stabilization procedures.
Innovation Solution
A bone fixation system comprising a sacrum anchor with external and internal threads, and a compression anchor that can be rotated to adjust compression, along with a guidance assembly to precisely position the anchors, allowing for controlled compression and minimization of trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If existing stabilization procedures are used to fixate the sacroiliac joint, then joint stability is improved, but trauma to nerves, blood vessels, and muscle groups increases significantly
Solution Approach 1:
The fixation system is divided into separate components: a sacrum anchor with internal threads, a compression anchor with external threads, and a guidance assembly. This segmentation allows each component to perform its specific function with minimal interference to surrounding tissues, reducing overall trauma while achieving joint stabilization.
Solution Approach 2:
The guidance assembly acts as an intermediary device that precisely positions the anchors during implantation. By providing accurate guidance, it enables minimal invasive placement of anchors, reducing trauma to nerves, blood vessels, and muscle groups while ensuring proper joint fixation.
2Stability of the object's composition
If existing fixation procedures are used, then sacroiliac joint immobilization is achieved, but the ability to adjust compression between sacrum and iliac bones is lost
Solution Approach 1:
The compression anchor features external threads that engage with internal threads of the sacrum anchor, creating a dynamic adjustment mechanism. This allows the compression force between the sacrum and iliac bones to be adjusted during and after implantation, providing versatility while maintaining joint immobilization.
Solution Approach 2:
The threaded engagement between the compression anchor and sacrum anchor enables change in compression parameters. By rotating the compression anchor, the compression force can be increased or decreased, allowing adaptive adjustment of the fixation strength and compression level on the sacroiliac joint.
3Ease of manufacture
If traditional anchor designs are used, then simple implantation is achieved, but precise positioning and controlled compression are not possible
Solution Approach 1:
The guidance assembly is designed to pre-establish the correct insertion path and angle for the anchors before implantation. This preliminary positioning action ensures precise anchor placement in the sacrum and iliac bone, achieving manufacturing precision without complicating the implantation procedure.
Solution Approach 2:
The guidance assembly serves as an intermediary tool that bridges the simplicity of implantation with the precision of positioning. It provides a straightforward insertion process while simultaneously ensuring accurate anchor placement and enabling controlled compression through its structural design.
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 system effectively stabilizes the sacroiliac joint while minimizing damage to surrounding tissues and allowing for adjustable compression, addressing the limitations of existing methods.
Implementation Method 1
Rotation of the first compression anchor about the second central axis draws the head of the first compression anchor toward the first sacrum anchor when the outer thread portion of the first compression anchor is threadably engaged with the internal thread portion of the first sacrum anchor
Data Source
AI summary
A system and method for fusing the sacroiliac joint is described herein. The system includes a first sacrum anchor and a first compression anchor for implantation through a bore in the iliac bone into engagement with the first sacrum anchor. The first sacrum anchor includes an external thread portion, and an internal channel defined by an inner surface. The inner surface includes an internal thread portion. The first compression anchor includes an outer thread portion along part of the shaft configured to engage the internal thread portion of the first sacrum anchor. Rotation of the first compression anchor draws the first compression anchor toward the first sacrum anchor when the outer thread portion of the first compression anchor is threadably engaged with the internal thread portion of the first sacrum anchor. This configuration allows a user to dial in the appropriate compression on the SI joint.