Piling-Cup Acetabular Prosthesis for Stable Fixation
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Solution Overview
Problem
Current acetabular reconstruction prostheses face issues such as displacement, instability, high surgical complexity, and increased risk of fracture due to inadequate fixation and high manufacturing costs, particularly in hip joint revision surgeries.
Innovation Solution
An acetabular reconstruction prosthesis with a piling-cup system is developed, utilizing a 'four-column theory' and 'two-line' configuration of pile screws and a 3D-printed porous titanium mesh cup, which are anatomically aligned to distribute mechanical loads effectively and promote osseointegration, enhancing stability and reducing surgical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If jumbo-cup system is used to reconstruct the acetabulum, then the acetabular reconstruction can be performed, but displacement of the acetabular prosthesis may occur which affects the stability and function
Solution Approach 1:
The prosthesis system is divided into multiple segments: a cup component and multiple fixation bars (first, second, third, and fourth fixation bars) positioned at different locations. This segmentation allows each component to perform its specific function - the cup provides the acetabular reconstruction while the distributed fixation bars provide stable anchoring at multiple points, preventing displacement without requiring a single complex monolithic structure.
2Reliability
If metal reinforcement rings are used, then temporary fixation role is played during fusion process, but fatigue fracture may occur due to lack of biological fixation
Solution Approach 1:
The invention employs a composite construction combining metal components (cup and fixation bars) with biological elements (host bone and allogenic bone). The metal fixation bars provide immediate mechanical stability during the fusion process, while the biological bone materials enable long-term biological fixation. This composite approach allows the metal components to be temporarily load-bearing during healing, then gradually transfer loads to the biologically integrated structure, preventing fatigue fracture.
3Reliability
If custom triflange acetabular components are used, then acetabular reconstruction can be achieved, but high manufacturing cost, long design time and difficulty in installation during surgery occur
Solution Approach 1:
The cup component and fixation bars are designed as universal, modular elements that can be applied to various acetabular reconstruction cases without requiring custom manufacturing. The fixation bars can be positioned at different locations (anterior, posterior, superior, inferior) to adapt to different anatomical variations and defect patterns. This universality eliminates the need for expensive, time-consuming custom design while maintaining the ability to achieve effective acetabular reconstruction tailored to each patient's needs.
Data Source
AI summary
An acetabular reconstruction prosthesis with a piling-cup system is provided, which includes an iliac posterior pile screw, an iliac anterior pile screw, a pubic pile screw, an ischial pile screw, abutments, a 3D (three-dimensional) printed porous titanium mesh cup, locking screws, nuts, and tail cap screws. Four pile screws are the iliac posterior pile screw facing posterior of the ilium, the iliac anterior pile screw facing iliac tubercle, the ischial pile screw running along ischium ramus, and the pubic pile screw running along pubic ramus. A stable prothesis support system is formed in the acetabular reconstruction prosthesis with a piling-cup system, which conforms to the biomechanical characteristics of physiological pelvis, reduces the risk of prosthesis loosening and dislocation, and improves long-term stability of the prosthesis through biological fixation.