Expandable Acetabular Cup Augment for Variable Bone Defects
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Solution Overview
Problem
Existing hip joint replacement surgical procedures face challenges in securing an acetabular cup due to bone defects or loss, requiring multiple augment modules for different bone conditions, which complicates the surgical process.
Innovation Solution
An expandable augment system with adjustable plates that can pivot and incrementally change size, allowing attachment to both the acetabular cup and bone, and optionally a fixed angle augment module, facilitating secure fixation using bone cement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple augment modules are used for different bone conditions, then the ability to address various bone defects is improved, but the surgical process becomes more complex
Solution Approach 1:
The augment module incorporates movable joints between plates that allow dynamic adjustment of the augment's configuration during surgery. This enables a single augment module to adapt to different bone defect types and acetabular cup sizes by changing its structural arrangement, eliminating the need for multiple specialized augment modules and simplifying the surgical selection process.
Solution Approach 2:
The augment module is designed with universal components that can perform multiple functions. The same basic augment module can be configured to address various bone defects, support different acetabular cup sizes, and accommodate different bone conditions through its adjustable plates and joints, replacing the need for multiple specialized augment modules.
2Manufacturing precision
If multiple augment modules are used for different acetabular cup sizes, then the fit precision is improved, but the number of components increases
Solution Approach 1:
The augment module uses adjustable plates with movable joints that can be configured to match different acetabular cup sizes. The plates can be positioned and secured in various configurations, allowing a single augment module design to precisely fit multiple cup sizes without requiring separate augment modules for each size category.
Solution Approach 2:
The augment module is divided into separate adjustable plates connected by joints, allowing individual components to be positioned and secured independently. This segmentation enables precise adjustment to match different acetabular cup geometries while using the same basic component set, reducing the overall number of components needed compared to having dedicated modules for each cup size.
3Ease of manufacture
If a fixed augment module is used, then the manufacturing simplicity is improved, but the adaptability to different bone conditions deteriorates
Solution Approach 1:
The augment module incorporates movable joints and adjustable plates that allow post-manufacturing adaptation to different bone conditions. While the basic module design remains simple to manufacture, the joint mechanisms enable the augment to be configured during surgery to match various bone defect patterns, acetabular cup sizes, and bone conditions, bridging the gap between manufacturing simplicity and surgical adaptability.
Solution Approach 2:
The augment module is segmented into adjustable plates connected by joints, allowing the structure to be reconfigured during surgery to match different bone conditions. This segmentation provides adaptability while maintaining a relatively simple basic design that can be manufactured using standard processes, as the complexity arises from the assembly and adjustment rather than the manufacturing of individual components.
Data Source
AI summary
An expandable augment system is provided for use with an acetabular cup. The expandable augment system can include an expandable augment module that is adjustable in size and that can be adjusted incrementally between a fully collapsed state and an expanded state. A first portion of the expandable augment module is attachable to an outer surface of an acetabular cup and a second portion of the expandable augment module is attachable to bone or to a fixed augment module (e.g., a fixed angle augment module) that is attached to bone and interposed between the adjustable augment module and bone.