Flexible Acetabular Cage Flange for Bone Conformation
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Solution Overview
Problem
Acetabular cage flanges are prone to fractures due to high stresses from anatomical loading and bending during surgical placement, which complicates proper positioning and fixation to the patient's bony tissue.
Innovation Solution
The acetabular cage incorporates a flexible region, such as a drapable chainmail structure or channels and isthmian strips, allowing the flange to conform to the bony tissue geometry and facilitate relative movement, reducing stress and improving placement without manual manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flange is made rigid to provide stability and strength, then the structural strength and stability are improved, but the ability to conform to bony tissue geometry and accommodate surgical positioning is worsened
Solution Approach 1:
The flange is divided into multiple discrete fixation elements (such as fixation spikes, protrusions, or interlocking features) that can independently engage with the bony tissue. This segmentation allows each element to adapt to the specific geometry of the acetabular defect while maintaining overall structural integrity through the connecting struts and flexible region.
Solution Approach 2:
The flange incorporates a flexible region that allows dynamic adjustment and movement during surgical placement. This flexible portion can be manually manipulated to conform to the patient's anatomy and then locked into position, enabling the flange to adapt to variations in bony tissue geometry while maintaining strength when fixed.
2Adaptability or versatility
If the flange is bent during surgical placement to achieve proper positioning, then the adaptability to the acetabular defect is improved, but the stress on the flange increases leading to higher fracture risk
Solution Approach 1:
The flange incorporates a flexible region with a thin-walled or lattice structure that can be manually manipulated during surgery to conform to the acetabular defect. This flexible portion is designed to yield under surgical manipulation forces but then lock into position, distributing the stresses of bending across multiple fixation elements rather than creating stress concentration at a single bend point.
Solution Approach 2:
By dividing the flange into discrete fixation elements connected by flexible struts, the structure can accommodate bending forces without creating a single point of failure. Each fixation element independently engages the bone, and the segmented design allows stress to be distributed across multiple engagement points rather than concentrating at a bent location.
3Reliability
If the flange is designed with fixation features to secure to bony tissue, then the fixation stability is improved, but the complexity of the flange structure increases
Solution Approach 1:
The fixation features are merged with the flange structure itself rather than being separate components. The fixation spikes, protrusions, or interlocking features are integral to the flange design, combining the structural support function with the fixation function in a single unified component. This reduces overall device complexity by eliminating separate fixation mechanisms while maintaining stable bone engagement.
Data Source
AI summary
An acetabular cage or device is disclosed. In one embodiment, the acetabular cage includes a cup portion configured for implantation in an acetabulum and a flange extending from the cup portion. The flange including a first, bone contacting surface configured to face bony tissue surrounding the acetabulum when the cup portion is implanted into the acetabulum and a second, top surface opposite the first surface. The flange includes a flexible portion and a fixation portion, the fixation portion including one or more fixation features configured to facilitate fixation of the flange to the bony tissue surrounding the acetabulum. The flexible portion is arranged and configured to enable the flange, and hence the fixation portion, to move relative to the cup portion to facilitate placement of the flange relative to the bony tissue.