Bone Implant Surface Modification via Gas Cluster Ion Beam
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Solution Overview
Problem
Bone-implantable medical devices face challenges with the retention of osteoinductive agents during implantation due to mechanical abrasion, leading to premature removal and delayed integration, and existing polymer technologies for controlled release have issues with cracking, migration, and potential toxicity.
Innovation Solution
The use of gas cluster ion beam processing to create shallow surface layers on bone-implantable medical devices that promote bone growth and adhesion, combined with holes loaded with therapeutic agents, which are resistant to abrasion and allow for controlled release through the formation of infused surface layers and thin barrier layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If polymer coatings are used for controlled release of osteoinductive agents, then release control is improved, but the polymer cracks, migrates, and causes toxicity during implantation
Solution Approach 1:
The patent extracts and eliminates the polymer coating layer from the system, replacing it with direct ion beam processing of the implant surface. This removes the source of cracking and migration while maintaining controlled release functionality through physical modification of the implant surface and incorporation of osteoinductive agents directly into the implant material.
Solution Approach 2:
The patent introduces ion beam processing as an intermediary mechanism between the implant surface and osteoinductive agents. Instead of using polymer as a carrier, the ion beam directly modifies the implant surface to create a porous, reactive layer that facilitates controlled release of osteoinductive agents without the drawbacks of polymer materials.
2Ease of manufacture
If conventional coating methods are used to apply osteoinductive agents, then application is simple, but the coating is prematurely removed by mechanical abrasion during implantation
Solution Approach 1:
The patent applies preliminary action by performing ion beam processing on the implant surface before applying osteoinductive agents. This pre-treatment creates a porous, reactive surface layer that is mechanically interlocked with the implant substrate, ensuring that subsequently applied osteoinductive agents remain firmly attached and resist mechanical abrasion during implantation.
Solution Approach 2:
The patent creates a composite structure by combining the implant material with ion beam-induced surface modifications and integrated osteoinductive agents. This composite approach ensures that the osteoinductive agents are not merely coated on the surface but are chemically and physically integrated into the implant material itself, preventing premature removal.
3Reliability
If the implant surface is made highly porous to enhance bone integration, then bone growth is improved, but mechanical strength is reduced
Solution Approach 1:
The patent applies local quality by using ion beam processing to create highly porous surfaces only in specific regions of the implant where bone integration is needed, while maintaining the integrity and mechanical strength of other critical areas. This localized modification allows different parts of the implant to have different properties optimized for their specific functions.
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
Enhances the retention and controlled release of osteoinductive agents, reducing mechanical stress effects and polymer-related issues, thereby improving integration times and healing outcomes.
Implementation Method 1
The use of gas cluster ion beam processing to create shallow surface layers on bone-implantable medical devices that promote bone growth and adhesion
Implementation Method 2
the formation of infused surface layers and thin barrier layers
Data Source
AI summary
A bone implantable medical device made from a biocompatible material, preferably comprising titania or zirconia, has at least a portion of its surface modified to facilitate improved integration with bone. The implantable device may incorporate a surface infused with osteoinductive agent and/or may incorporate holes loaded with a therapeutic agent. The infused surface and/or the holes may be patterned to determine the distribution of and amount of osteoinductive agent and/or therapeutic agent incorporated. The rate of release or elution profile of the therapeutic agent may be controlled. Methods for producing such a bone implantable medical device are also disclosed and employ the use of ion beam irradiation, preferably gas cluster ion beam irradiation for improving bone integration.