Copper-Titanium Coating for Nickel-Titanium Medical Instruments
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current medical instruments with nickel-titanium alloy components face challenges in maintaining mechanical properties and inhibiting cell growth during large-amplitude deformation, as existing coatings tend to crack or fall off due to differences in stiffness and toughness, and fail to effectively prolong the recovery time window of short-term implants like vena cava filters.
Innovation Solution
A copper-titanium coating with an elementary copper phase, amorphous titanium-containing substance, and a copper-nickel intermetallic transition layer is applied using plasma sputtering deposition, ensuring good bonding with the nickel-titanium alloy substrate and releasing copper ions to inhibit endothelialization, while maintaining mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer coating is applied to inhibit cell growth, then cell embedding is inhibited, but the coating cracks and falls off during deployment due to large differences in stiffness and toughness between metal and polymer
Solution Approach 1:
The invention changes the material parameter from polymer to metal (copper-titanium alloy), fundamentally altering the mechanical properties to match the nickel-titanium alloy substrate. This parameter change eliminates the stiffness mismatch that causes coating failure during deployment while maintaining the biological function of inhibiting cell embedding through copper ion release.
Solution Approach 2:
The invention creates a composite coating system by combining copper and titanium in specific proportions (40-80 wt% Cu, 20-60 wt% Ti) to achieve optimal mechanical properties and biological functionality. The composite structure provides both the mechanical integrity needed to withstand deployment and the copper ion release capability to prevent cell embedding.
2Duration of action of moving object
If the recovery time window is extended, then successful filter recovery is improved, but endothelial cells embed and tissue encapsulates the filter making recovery difficult
Solution Approach 1:
The invention converts the harmful effect of copper ions (which can be toxic at high concentrations) into a beneficial effect by controlling their release rate. The copper ions initially inhibit cell embedding to allow recovery, then gradually release to provide long-term thrombosis prevention. The transition layer design ensures controlled release that transforms potential harm into extended protection.
Solution Approach 2:
The coating provides preliminary protection against cell embedding during the critical early period when the filter is implanted. By preventing endothelial cell attachment and tissue encapsulation in advance, the coating creates a window of opportunity for successful filter recovery before biological integration occurs.
3Reliability
If a copper-titanium coating is applied to inhibit cell growth, then blood compatibility is improved, but the coating may affect the mechanical properties of fine nickel-titanium alloy components
Solution Approach 1:
The invention applies local quality by creating a transition layer with copper-nickel intermetallic phase at the interface between the copper-titanium coating and the nickel-titanium alloy substrate. This transition layer gradually changes the material composition and properties, providing good bonding and stress distribution while maintaining the mechanical strength of the fine components and the blood compatibility of the coating.
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 copper-titanium coating provides improved blood compatibility, mechanical toughness, and prolonged recovery time by effectively inhibiting cell growth on medical instruments, ensuring successful recovery and reducing the risk of thrombosis.
Implementation Method 1
a copper-titanium coating is deposited on a surface of a medical instrument having a fine nickel-titanium alloy component by plasma sputtering
Implementation Method 2
the copper-titanium coating continuously releases copper ions in the human body, and thus may effectively inhibit the embedding of cells on the surface of the medical instrument
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5B
AI summary
Disclosed is a medical instrument coating, being coated on the surface of a nickel-titanium alloy component of a medical instrument. The medical instrument coating comprises an elementary copper phase, an amorphous titanium-containing substance and a transition layer comprising a copper-nickel intermetallic phase. Also mentioned is a preparation method for the medical instrument coating. A medical instrument comprising a copper-titanium coating has good blood compatibility, and simultaneously can inhibit the endothelialization of the medical instrument surface, thereby improving the recovery rate of the medical instrument and prolonging the recovery time window; the copper-titanium coating belongs to the group of metal composite coatings, has a certain toughness and ductility, and avoids the large-amplitude deformation process of the medical instrument damaging the coating; and the mechanical property and the coating quality of the medical instrument comprising a fine nickel-titanium alloy component are guaranteed by the method for preparing the coating.