Arched Hipbone Prosthesis for Pelvic Stability
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Solution Overview
Problem
Current hipbone prostheses face issues with unreliable supporting and easy fatigue break of the screw-rod system, leading to bone damage and instability, especially in the complex anatomical structure of the pelvis after tumor excision.
Innovation Solution
A hipbone prosthesis with an arched structure, featuring a screw-rod structure, anti-dropping mechanism, and adjustable acetabular cup, which improves mechanical properties and internal force distribution, ensuring stability under high stress and shear forces, and allows for customizable positioning to enhance postoperative recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a screw-rod system is used for pelvic reconstruction, then the pelvic ring can be stabilized, but the system suffers from unreliable supporting and easy fatigue break leading to bone damage
Solution Approach 1:
The prosthesis divides the pelvic reconstruction into modular components: a sacral base portion, a rod body, and an acetabular cup portion, each performing specific functions. The sacral base portion anchors to the sacrum, the rod body provides structural support, and the acetabular cup portion reconstructs the hip joint, allowing independent optimization of each segment's mechanical properties
Solution Approach 2:
The prosthesis employs an arched/curved structural design in the rod body that mimics the natural curvature of the pelvic anatomy. This curved configuration distributes mechanical stresses more evenly along the structure, reducing stress concentration points that would lead to fatigue failure of screw-rod systems
2Strength
If traditional reconstruction methods are used, then the pelvic defect can be filled, but the supporting reliability is insufficient and fatigue break occurs easily
Solution Approach 1:
The prosthesis utilizes composite construction combining metal components (sacral base, rod body, acetabular cup) with appropriate material properties. The design integrates different material characteristics to achieve both high strength for immediate load-bearing and fatigue resistance for long-term durability in the physiological environment
Solution Approach 2:
The prosthesis is designed with pre-configured stress distribution characteristics through its arched structure and geometric optimization. The design anticipates and pre-distributes physiological loads before they occur, preventing stress concentration that would lead to fatigue failure over time
3Ease of manufacture
If the acetabular cup position is fixed, then the implantation is simplified, but the adaptability to different patient anatomies and injury patterns is reduced
Solution Approach 1:
The connection between the rod body and acetabular cup portion incorporates adjustable positioning capabilities, allowing the acetabular cup to be oriented in multiple directions and angles. This dynamic adjustment feature enables customization to match each patient's specific anatomy and injury pattern while maintaining a relatively simple overall implantation procedure
Data Source
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AI summary
The present invention provides a hipbone prosthesis, comprising: a prosthesis main body (10), the prosthesis main body (10) being of an arched structure, the prosthesis main body including a first end portion (11) and a second end portion, and the first end portion (11) being contacted and matched with a sacrum (1); and an acetabular cup (20) and a connecting device (30), the acetabular cup (20) being connected with the second end portion in a position adjustable manner via the connecting device (30). According to the technical solutions of the present invention, the problems of unreliable supporting and easy fatigue break of a screw-rod system in the related technology are effectively solved.