Gas-Cluster Ion Beam Surface Modification for Implants

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Solution Overview

Problem

Current methods for modifying surfaces to enhance bioactivity, such as those for medical implants and biological laboratory wares, often result in surface damage or inadequate cell attachment and proliferation due to the use of conventional ion beams, which can lead to charge-induced damage and space charge effects.

Innovation Solution

The use of gas-cluster ion beam (GCIB) and neutral beam technology to modify surfaces, where gas-cluster ions are accelerated and then neutralized to form neutral beams, allowing for shallow penetration and enhanced bioactivity without the drawbacks of charged ion beams, facilitating improved cell attachment and proliferation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional ion beams are used to modify surfaces, then surface modification is achieved, but surface damage and charge-induced damage occur

Engineering Contradiction:

Improvesurface modification qualityVSAvoidsurface damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the physical parameters of the ion beam by using gas-cluster ions with larger mass and lower velocity compared to conventional ion beams. This parameter change allows for shallow penetration depth and reduced surface damage while maintaining effective surface modification. The gas-cluster ions deliver energy more gently distributed over a larger volume, avoiding the concentrated damage caused by conventional high-velocity ions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces gas-cluster ions as an intermediary between the ion beam and the surface. These gas-cluster ions act as a mediator that transfers momentum and energy more gently to the surface atoms, reducing direct damage. The cluster structure distributes the interaction over multiple atoms, preventing concentrated damage spots that occur with conventional ion beams.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If charged ion beams are used for surface processing, then surface modification is achieved, but space charge effects and charge-induced damage occur

Engineering Contradiction:

Improvesurface modification qualityVSAvoidspace charge effects

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent changes the charge state parameter by using neutral or weakly charged gas-cluster ions instead of highly charged conventional ions. This parameter change eliminates space charge effects that occur when highly charged ions are used, as neutral particles do not interact electrostatically with each other or the target material in the same way. The surface modification is achieved through physical impact and chemical interaction rather than electrostatic forces.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional ion beams are used to enhance cell attachment, then surface bioactivity is improved, but cell viability is reduced due to surface damage

Engineering Contradiction:

Improvecell attachment capabilityVSAvoidcell viability reduction

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the energy delivery parameters by using low-velocity gas-cluster ions that deposit energy more gently and uniformly. This parameter change creates surface modifications that enhance cell attachment (such as increased surface area, altered chemistry, or controlled roughness) without creating the damaged zones, cracks, or contaminated regions that would harm cell viability. The modified surfaces provide better anchoring points for cells while maintaining overall surface integrity.

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 and neutral beam processing significantly enhance cell adherence and proliferation on various surfaces, including titanium, glass, and polymers, creating a more conducive environment for tissue integration and growth while minimizing surface damage.

Implementation Method 1

gas-cluster ions are accelerated and then neutralized to form neutral beams

Methodology Applied

Scientific EffectGas-cluster ion beam acceleration: Ion Beam

Implementation Method 2

gas-cluster ions are accelerated and then neutralized to form neutral beams

Methodology Applied

Scientific EffectNeutralization:

Implementation Method 3

GCIB and neutral beam processing significantly enhance cell adherence and proliferation on various surfaces

Methodology Applied

Scientific EffectGas-cluster ion beam processing:

Data Source

PatentUS9144627B2Methods for improving the bioactivity characteristics of a surface and objects with surfaces improved thereby

Publication Date: 2015.09.29 EXOGENESIS CORP

AI summary

The invention provides for a method of improving bioactivity of a surface of an implantable object. The invention also provides for a method of improving bioactivity of a surface of biological laboratory ware. The invention further provides a method of attaching cells to an object. The invention even further provides for a method of preparing an object for medical implantation. The invention also provides for an article with attached cell, and for an article for medical implantation. Improvements result from the application of gas-cluster ion beam technology and from the application of neutral beam technology, wherein neutral beams are derived from accelerated gas-cluster ion beams.