Artificial Knee Joint Pad With Oblique Posterior Cruciate Bed
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Solution Overview
Problem
Existing posterior cruciate ligament retaining type knee prostheses fail to comprehensively avoid the posterior cruciate ligament, leading to potential damage and patient discomfort due to cutting of the ligament during motion.
Innovation Solution
A bearing for an artificial knee joint with a recessed posterior cruciate bed that extends obliquely to accommodate the ligament, preventing interference and damage by matching the ligament's movement space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recess is provided to avoid the posterior cruciate ligament, then the ligament can be avoided from being cut, but the ligament may still interfere with the recess during motion causing damage or discomfort
Solution Approach 1:
The patent transforms the traditional planar recess into a three-dimensional posterior cruciate bed with oblique upward extension. This dimensional enhancement creates additional space above the bed that accommodates the ligament's movement trajectory, preventing interference while maintaining the avoidance function.
Solution Approach 2:
The posterior cruciate bed acts as an intermediary structure between the bearing body and the posterior cruciate ligament. By providing a recessed bed with oblique surface, it mediates the interaction between the implant and ligament, allowing the ligament to move freely within the created space without direct contact that would cause cutting or damage.
2Ease of manufacture
If the recess surface is made flat, then manufacturing is simpler, but it does not match the ligament's movement space causing interference
Solution Approach 1:
The patent applies local quality by creating a specifically shaped oblique surface within the recess rather than a uniform flat surface. This localized geometric modification at the posterior cruciate bed surface provides the necessary adaptation to the ligament's movement space while maintaining relative manufacturing simplicity through defined angular geometry.
Data Source
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AI summary
An artificial knee joint pad and a method for constructing a posterior cruciate bed of an artificial knee joint pad. The artificial knee joint pad comprises a body, wherein the body is fixed to an upper resection surface of a tibia and comprises a medial support portion and a lateral support portion, which are arranged opposite to each other in a width direction of the body, the medial support portion and the lateral support portion respectively bearing a medial condyle and a lateral condyle of a femur; and a posterior side surface of the body is a posterior condyle surface, a recess opening backwards and used for avoiding a posterior cruciate ligament of a human body is formed in the posterior condyle surface, the recess is positioned between the medial support portion and the lateral support portion, and a surface of the recess is recessed inwards to form a posterior cruciate bed, and a surface of the posterior cruciate bed extends obliquely upwards in a direction away from the posterior condyle surface.