Porous Fixation Peg Structure for Bone Ingrowth and Low Abrasion

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Solution Overview

Problem

Existing rapid prototyping techniques focus on increasing the density of three-dimensional structures, neglecting the need for porous structures that promote bone ingrowth and stable implant-bone interface for orthopaedic prosthetics, which require sufficient surface texture and fixation features for effective bone integration.

Innovation Solution

The development of orthopaedic prosthetic components with porous three-dimensional structures featuring fixation pegs that include a plurality of plates with tapered bodies and solid outer walls, designed to permit bone ingrowth and reduce bone abrasion, utilizing additive manufacturing methods to create these structures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If rapid prototyping techniques focus on increasing the density of three-dimensional structures, then manufacturing precision and structural strength are improved, but the ability to promote bone ingrowth and create stable implant-bone interfaces deteriorates

Engineering Contradiction:

Improvedensity of three-dimensional structuresVSAvoidbone ingrowth promotion and implant-bone interface stability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The fixation peg incorporates plates with different structural characteristics at different locations: solid outer walls provide structural strength and stability, while porous inner structures promote bone ingrowth. This local differentiation of material properties resolves the contradiction between density and bone integration.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The fixation peg combines solid and porous materials within a single structure. The solid plates provide mechanical strength and stability, while the porous regions facilitate bone ingrowth, creating a composite structure that simultaneously achieves both density requirements and bone integration requirements.

Inventive Principle:

Principle #40Composite materials

2Strength

If fixation features with higher fixation strength are used, then implant-bone interface stability is improved, but device complexity increases

Engineering Contradiction:

Improvefixation strengthVSAvoidstructure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The fixation peg is divided into multiple plates arranged in a circumferential pattern. Each plate is a simple geometric form, but their collective arrangement provides enhanced fixation strength. This segmentation allows achieving high strength without requiring each individual component to be complex.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple simple plates are merged into a single fixation peg structure that functions as an integrated fixation feature. The combination of multiple plates provides cumulative fixation strength while maintaining relative simplicity of each individual plate design.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12564496B2Hybrid fixation features for three-dimensional porous structures for bone ingrowth and methods for producing

Publication Date: 2026.03.03 DEPUY (IRELAND) LTD

AI summary

An orthopaedic prosthetic component comprises a fixation peg including a porous three-dimensional structure configured to permit bone in-growth. The porous three-dimensional structure has an outer surface boundary. The fixation peg includes a plate attached to the porous three-dimensional structure at the outer surface boundary. The plate includes a tapered body having an outer wall that faces away from the porous three-dimensional structure and is devoid of any openings.