Tibial Tray Fixation Elements for Stable Insert Connections
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Solution Overview
Problem
Existing artificial knee joint designs face challenges in securing a stable connection between the tibial tray and insert, particularly when using ceramic materials, and in managing mechanical loads to avoid exceeding design limits.
Innovation Solution
The tibial tray features central and anterior fixation elements with form-fitting and force-locking protrusions, along with a posterior fixation element, designed for a secure connection with the tibial insert, utilizing a combination of press-fit and form-fitting mechanisms to manage mechanical loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If form-fitting designs are used to secure connection between tibial tray and tibia, then connection stability is improved, but manufacturing complexity increases
Solution Approach 1:
The connection system is divided into separate components: the tibial tray with integrated form-fitting elements and the tibial insert with corresponding recesses. This segmentation allows each component to be manufactured independently with standardized geometries, reducing overall manufacturing complexity while maintaining secure connection through the complementary fit of the segmented parts.
2Reliability
If ceramic material is used for tibial tray, then biocompatibility and wear resistance are improved, but susceptibility to mechanical overload increases
Solution Approach 1:
The tibial tray design incorporates locally optimized features including reinforced geometric patterns and strategically positioned form-fitting elements that concentrate mechanical loads away from the ceramic material. The proximal surface geometry and fixation element configurations are specifically engineered to distribute stresses, protecting the ceramic from overload while maintaining its inherent biocompatibility and wear resistance properties.
3Reliability
If multiple fixation elements are added to tibial tray, then connection reliability is improved, but assembly complexity increases
Solution Approach 1:
Multiple fixation functions are merged into integrated form-fitting elements that combine geometric interlocking and mechanical locking capabilities. The proximal surface features integrated fixation elements that simultaneously provide form-fitting connection and load distribution, eliminating the need for separate fixation components and simplifying the assembly process while maintaining high connection reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a stable and secure connection between the tibial tray and insert, reducing micromovements and ensuring effective load distribution, while allowing for easy assembly and reducing mechanical stress.
Implementation Method 1
The at least two central fixation elements configured as cylindrical protrusions or linear protrusions, in a non-limiting embodiment, designed for press-fit
Implementation Method 2
The central fixation elements are protrusions from the proximal surface which can be connected as form fitting and/or force locking with the tibial insert
Data Source
AI summary
A tibial tray with a proximal surface, the proximal surface comprising at least two, in particular exactly two central fixation elements for enabling a connection with a tibial insert as a further part of an artificial knee joint, wherein the at least two central fixation elements are protrusions from the proximal surface in the proximal direction and the at least two central fixation elements are positioned symmetrically and/or parallel to a medial plane of the proximal surface, the medial plane being perpendicular to the proximal surface and intersecting the proximal surface in the middle between two most lateral points of the proximal surface. The invention