Collagen Implant Surface Modification via Gas Cluster Ion Beam

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Solution Overview

Problem

Current methods for enhancing bioactivity on surfaces, such as those for medical implants and laboratory wares, are inadequate in promoting cell attachment, proliferation, and integration, particularly due to limitations in surface modification techniques that can cause damage or fail to effectively increase biodegradation times of biopolymer scaffolds.

Innovation Solution

The use of gas cluster ion beam (GCIB) technology to modify surfaces by irradiating them with accelerated gas cluster ions, which improves bioactivity by enhancing cell attachment and proliferation while maintaining cellular differentiation, and the subsequent use of neutral beams to further process surfaces without causing charging effects, allowing for more controlled and effective surface modifications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional surface modification techniques are used to enhance bioactivity, then cell attachment and proliferation are improved, but surface damage occurs and biodegradation time is reduced

Engineering Contradiction:

Improvecell attachment and proliferationVSAvoidsurface damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the fundamental parameters of surface modification by using gas cluster ion beams with specific energy ranges (1-100 eV per atom) and controlled flux densities. This allows modification of surface properties to enhance cell attachment while avoiding the high-energy damage associated with conventional techniques. The parameter control includes adjusting ion beam energy, flux, and treatment duration to achieve optimal bioactivity without surface degradation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces mechanical/chemical surface modification techniques (such as sandblasting, acid etching, or chemical treatments) with a controlled ion beam process. This substitution enables precise surface property modification through physical ion bombardment at controlled energies, avoiding the uncontrolled mechanical or chemical damage that reduces surface integrity and accelerates biodegradation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If conventional ion beam techniques are used to modify surfaces, then surface properties are changed, but charging effects damage electrically insulating materials

Engineering Contradiction:

Improvesurface property modificationVSAvoidcharging effects

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the energy parameter of the ion beam to below the charging threshold for insulating materials (maintaining ion beam energies between 1-100 eV per atom). This low-energy regime allows surface modification through ion bombardment effects while preventing charge accumulation that would damage electrically insulating materials. The parameter control is critical to achieving modification without harmful charging.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If surface bioactivity is enhanced to promote cell growth, then integration with tissues is improved, but control over biodegradation time is reduced

Engineering Contradiction:

Improveintegration with tissuesVSAvoidbiodegradation time

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent enables independent control of surface bioactivity parameters from bulk material composition. By using low-energy ion beam modification, the surface properties (enhancing cell attachment and tissue integration) can be improved without altering the bulk material's biodegradation characteristics. This selective parameter modification allows enhanced integration while maintaining controlled biodegradation rates.

Inventive Principle:

Principle #35Parameter changes

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

GCIB processing significantly enhances cell attachment and proliferation on various materials, including titanium, glass, and polymers, and extends biodegradation times of collagen scaffolds, leading to improved biocompatibility and integration with tissues, while neutral beams ensure surface processing without damaging electrically insulating materials.

Implementation Method 1

irradiating them with accelerated gas cluster ions, which improves bioactivity by enhancing cell attachment and proliferation

Methodology Applied

Scientific EffectKinetic energy transfer: Impact Force

Implementation Method 2

the subsequent use of neutral beams to further process surfaces without causing charging effects

Methodology Applied

Scientific EffectCharge neutralization: Electron Beam

Data Source

PatentEP2793911B1Methods for improving the bioactivity characteristics of a surface and objects with surfaces improved thereby

Publication Date: 2020.07.22 EXOGENESIS CORP

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AI summary

A method for improving bioactivity and/or biodegradation time of a collagen surgical implant and collagen surgical implants having such improved properties. A gas-cluster ion-beam (GCIB) is formed in a reduced-pressure chamber, a collagen surgical implant is introduced into the reduced-pressure chamber, and at least a first portion of the surface of said collagen surgical implant is irradiated with a GCIB-derived beam.