Cathodic Titanium Implant Coupled with Magnesium

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Solution Overview

Problem

Medical implants face challenges such as peri-implantitis, bacterial infections, and sub-optimal integration with the surrounding tissue, leading to inflammation and bone atrophy, which existing technologies have not adequately addressed.

Innovation Solution

A medical implant with a biocompatible material, such as titanium, coupled with a metal having a cathodic electrochemical potential, like magnesium, iron, or zinc, to induce a cathodic potential at the surface, reducing inflammation and promoting bone healing without external power sources, through electrochemical corrosion reactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional biocompatible materials like titanium are used for implants, then mechanical strength and corrosion resistance are improved, but inflammatory responses and bacterial infections still occur

Engineering Contradiction:

Improvemechanical strengthVSAvoidinflammatory response

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent changes the electrochemical parameter (surface potential) of the implant by coupling it with a cathodic metal. This parameter change transforms the implant surface from an anodic or neutral state to a cathodic state, which actively reduces inflammatory responses and bacterial infections while maintaining the mechanical strength of the base material.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The cathodic metal acts as an intermediary between the base implant material and the biological environment. It mediates the interaction by providing electrochemical protection through galvanic coupling, reducing harmful effects without compromising the structural integrity of the main implant.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If pharmacologically active agents are applied to implant surfaces to facilitate tissue repair, then bone growth is promoted, but the complexity of the implant increases

Engineering Contradiction:

Improvetissue integrationVSAvoidimplant structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The implant system provides its own protective function through the electrochemical coupling mechanism. The cathodic metal automatically reduces inflammatory responses and bacterial infections through galvanic protection, eliminating the need for external pharmacological agents or complex surface treatments, thereby maintaining simplicity while improving reliability.

Inventive Principle:

Principle #25Self-service

3Reliability

If the implant surface is treated with osteoinductive materials to promote bone growth, then bone healing is facilitated, but the manufacturing process becomes more complex

Engineering Contradiction:

Improvebone healingVSAvoidsurface treatment process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces complex mechanical or chemical surface treatments with an electrochemical mechanism. Instead of applying osteoinductive materials through sophisticated manufacturing processes, the cathodic electrochemical potential naturally promotes bone healing and tissue integration, simplifying the manufacturing process while maintaining or improving reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Reliability

If cathodic metals are coupled with the implant to induce cathodic potential, then inflammatory responses are reduced and bone healing is promoted, but the metal may corrode over time

Engineering Contradiction:

ImprovebiocompatibilityVSAvoidimplant longevity

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent converts the potential harm of metal corrosion into a beneficial effect. The controlled corrosion of the cathodic metal generates electrochemical protection that reduces inflammatory responses and promotes bone healing. The corrosion process, which would normally be harmful, is harnessed to provide ongoing therapeutic electrochemical stimulation at the implant site.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 effectively reduces inflammatory responses, inhibits bacterial proliferation, and promotes bone healing by controlling the electrochemical potential at the implant surface, enhancing integration and reducing the risk of complications like peri-implantitis.

Implementation Method 1

through electrochemical corrosion reactions

Methodology Applied

Scientific EffectElectrochemical corrosion: Redox Reactions

Data Source

PatentUS9039764B2Electrochemical coupling of metallic biomaterial implants for biological effect

Publication Date: 2015.05.26 SYRACUSE UNIVERSITY

AI summary

The invention discloses a novel method of controlling the open circuit potential (OCP) of a medical implant by coupling it with small amounts of metals having a lower OCP than the implant. Coupling of Mg to less than 1% of the surface area of a titanium implant is shown to induce cathodic polarization of the titanium that inhibits cell proliferation at the surface of the implant. Mg—Ti coupling in medical devices promises to attenuate or eliminate potential complications of surgery such as peri-implantitis and bacterial infections at the site of implantation.