Segmented Anchoring Base for Joint Prosthesis Stability

Solution Overview

Problem

Existing anchoring methods for joint prostheses face challenges in achieving stable fixation, particularly in poor bone quality or post-revision surgeries, and often require significant bone sacrifice or risk unscrewing, while existing solutions lack durability and rotational stability.

Innovation Solution

The anchoring base features wall portions with varying orientations and serrated edges for enhanced stability, allowing insertion into spongy bone and promoting bone growth, combined with a central tubular wall for wedging and bone anchoring reliefs, providing anti-rotational stability and resistance to tearing forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a tapered medullary rod is used for anchoring, then anchoring strength is improved, but bone sacrifice increases and implantation difficulty increases in poor bone quality

Engineering Contradiction:

Improveanchoring strengthVSAvoidbone sacrifice

Core Design Contradiction:

StrengthVSLoss of substance

Solution Approach 1:

The anchoring base is divided into multiple wall portions (first, second, third wall portions) with different orientations and positions. Each wall portion engages with bone at different locations and angles, distributing the anchoring load across multiple segmented points rather than relying on a single medullary rod, thereby reducing the need for significant bone sacrifice while maintaining anchoring strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wall portions are arranged asymmetrically with different orientations relative to the base wall. The first wall portion is oriented at a first angle, the second wall portion at a second angle, and the third wall portion at a third angle. This asymmetric arrangement allows the base to engage with irregular bone structures and provide stable anchoring in poor bone quality without requiring the symmetric precision of traditional medullary rods.

Inventive Principle:

Principle #4Asymmetry

2Strength

If a tapered medullary rod is used for anchoring, then anchoring strength is improved, but implantation difficulty increases in poor bone quality

Engineering Contradiction:

Improveanchoring strengthVSAvoidimplantation difficulty

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The anchoring base is divided into multiple wall portions (first, second, third wall portions) with different orientations and positions. Each wall portion engages with bone at different locations and angles, distributing the anchoring load across multiple segmented points rather than relying on a single medullary rod, thereby reducing the need for significant bone sacrifice while maintaining anchoring strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each wall portion is designed with specific local characteristics - different orientations, positions, and engagement angles tailored to interact with specific bone regions. This local quality allows each portion to optimize its engagement with the bone structure at its specific location, making implantation easier in poor bone quality while maintaining overall anchoring strength.

Inventive Principle:

Principle #3Local quality

3Loss of substance

If screw-on anchoring bases are used, then bone sacrifice is reduced, but risk of unscrewing increases

Engineering Contradiction:

Improvebone sacrificeVSAvoidrisk of unscrewing

Core Design Contradiction:

Loss of substanceVSReliability

Solution Approach 1:

The anchoring base is divided into multiple wall portions (first, second, third wall portions) with different orientations and positions. Each wall portion engages with bone at different locations and angles, distributing the anchoring load across multiple segmented points rather than relying on a single medullary rod, thereby reducing the need for significant bone sacrifice while maintaining anchoring strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wall portions are arranged asymmetrically with different orientations relative to the base wall. The first wall portion is oriented at a first angle, the second wall portion at a second angle, and the third wall portion at a third angle. This asymmetric arrangement allows the base to engage with irregular bone structures and provide stable anchoring in poor bone quality without requiring the symmetric precision of traditional medullary rods.

Inventive Principle:

Principle #4Asymmetry

4Loss of substance

If existing anchoring bases are used, then bone sacrifice is limited, but durability of holding to bone decreases

Engineering Contradiction:

Improvebone sacrificeVSAvoiddurability of holding

Core Design Contradiction:

Loss of substanceVSDuration of action of stationary object

Solution Approach 1:

The anchoring base is divided into multiple wall portions (first, second, third wall portions) with different orientations and positions. Each wall portion engages with bone at different locations and angles, distributing the anchoring load across multiple segmented points rather than relying on a single medullary rod, thereby reducing the need for significant bone sacrifice while maintaining anchoring strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wall portions are pre-oriented at specific angles during manufacturing to optimize their engagement with bone upon implantation. This preliminary orientation ensures that when the base is inserted, the wall portions are already positioned to maximize bone contact and anchoring durability from the outset, rather than requiring post-implantation adjustment.

Inventive Principle:

Principle #10Preliminary action

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 achieves significant anchoring stability, capable of withstanding repeated joint forces and ensuring long-term durability by promoting bone integration and distributing forces effectively.

Implementation Method 1

consisting in inserting said portions of wall into the spongy bone of the bone to be fitted by impaction

Methodology Applied

Scientific EffectImpaction: Impact Force

Implementation Method 2

after implantation of the base according to the invention, consisting in inserting said portions of wall into the spongy bone of the bone to be fitted by impaction, and once the growth of bone cells around said portions has taken place wall and that the bone has consolidated

Methodology Applied

Scientific EffectBone growth and consolidation:

Data Source

PatentEP2604227B1Bone anchoring base and set of elements including said base

Publication Date: 2015.03.25 FX SOLUTIONS

Figure 1~3
Figure 4~7
Figure 8~10

AI summary

The plate has an anchoring unit comprising wall portions (12) separated from each other and located near a peripheral wall of a base edge. The base edge is connected to a base wall (10), where a free end edge of the base wall is positioned opposite to a bottom edge. Two side edges of the base wall are extended between the base edge and the free end edge. The portions are arranged on the base wall such that one of the side edges is located at a distance from center of the base wall, which is different from another distance of the other side edge with respect to the center. An independent claim is also included for an elements assembly for creating a joint prosthesis.