Prosthesis Anchoring System with Press-Fit and Anti-Rotation Geometry
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Solution Overview
Problem
Current anchoring systems for prostheses lack sufficient mechanical strength and stability, leading to potential damage from moderate overload forces and mechanical stresses, which can result in the loosening of surgically implanted parts and the need for additional surgical operations.
Innovation Solution
The anchoring system incorporates an outer threaded profile with varying thread depths and a press-fit connection with anti-rotation geometry and conical portions to enhance bone anchoring, stability, and load distribution, featuring a press-fit connection with a conical portion for secure attachment and a polygon cross-section for anti-rotation, along with surface treatments for wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the anchoring element is designed with a through-hole for communication pathways, then bidirectional communication with the human body is enabled, but the mechanical strength of the anchoring element is reduced
Solution Approach 1:
The anchoring element features non-uniform wall thickness with thicker sections at critical stress points (distal end and thread roots) and thinner sections where communication pathways are needed. This local variation in quality allows the structure to maintain mechanical strength where required while enabling communication functionality where needed.
Solution Approach 2:
The anchoring element combines different material properties through surface treatments (anodization, coating layers) and structural composite design (threaded sections combined with smooth sections, varying wall thicknesses) to achieve both mechanical strength and communication functionality simultaneously.
2Device complexity
If the anchoring system uses a simple connection between anchoring element and abutment, then the device complexity is reduced, but the mechanical strength and stability under overload forces are insufficient
Solution Approach 1:
The connection structure is divided into multiple functional segments: a press-fit connection zone with interference fit, a threaded engagement zone for the abutment screw, and a distal portion with specific geometry. This segmentation allows each zone to handle specific mechanical loads, providing overall strength without excessive complexity.
Solution Approach 2:
The anchoring element incorporates rounded transitions, fillets at thread roots, and curved surface profiles to eliminate stress concentration points. The smooth curved transitions between different sections distribute mechanical stresses more evenly, enhancing overall mechanical strength without adding complex features.
3Ease of manufacture
If the anchoring element has uniform wall thickness, then the manufacturing process is simplified, but the mechanical strength under bending and rotational forces is reduced
Solution Approach 1:
The anchoring element features non-uniform wall thickness with thicker sections at critical stress points (distal end and thread roots) and thinner sections where communication pathways are needed. This local variation in quality allows the structure to maintain mechanical strength where required while enabling communication functionality where needed.
4Ease of manufacture
If the anchoring system uses standard threaded profile, then the ease of manufacture is improved, but the anti-rotation capability and stability are insufficient
Solution Approach 1:
The anchoring element incorporates asymmetric features including a polygonal cross-section in the distal portion and non-circular anti-rotation geometries (flat spots, ridges, or keyed features) that prevent rotational movement of the abutment. These asymmetric features provide superior anti-rotation capability while remaining manufacturable using standard processes.
Data Source
AI summary
The present invention relates to an anchoring system for attaching a prosthesis to a human body, comprising: an anchoring element, an abutment, an abutment screw for attaching the abutment to the anchoring element, the anchoring element comprises a connection area for the abutment, the connection area comprising a press-fit portion such that the abutment is attached to the anchoring element in the connection area by a press-fit connection, wherein the connection area comprises an anti-rotation geometry and the abutment comprising a corresponding mating anti-rotation geometry proximal to the press-fit portion, and where in the connection area comprises a conical portion proximal to the anti-rotational geometry forming a mating geometry for a corresponding conical portion in the through-hole of the abutment.