Spinal Implant Coating Layout for Lower Antimicrobial Metal Use
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Solution Overview
Problem
Existing spinal implants with antimicrobial coatings contain high amounts of antimicrobial metal agents, which may be undesirable due to various considerations.
Innovation Solution
A spinal implant design with a base and a coating film comprising a calcium phosphate-based material and an antimicrobial agent, where the coating film is partially applied, with regions of different film thicknesses to minimize the amount of antimicrobial agent exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating film with antimicrobial agent is applied to the entire base surface, then the antimicrobial effect is maximized, but the amount of antimicrobial agent increases and peeling risk increases
Solution Approach 1:
The coating film is selectively applied to specific regions of the base surface rather than the entire surface. The first region receives the coating film with antimicrobial agent, while the second region remains exposed. This local quality approach concentrates the antimicrobial agent where it is most needed for infection prevention, while reducing the total quantity used and minimizing peeling risks associated with full-surface coating.
2Reliability
If the coating film is made thicker to prevent peeling, then the coating durability improves, but the amount of antimicrobial agent increases
Solution Approach 1:
Different regions of the base have different coating film thicknesses. The first region has a thicker coating film that provides enhanced durability and peeling resistance, while the second region has no coating. This local quality differentiation allows the thicker, more durable coating to be applied only where necessary, reducing the total amount of antimicrobial agent compared to uniform full-surface thick coating.
3Reliability
If the coating film is applied to all surfaces including inner surfaces, then the antimicrobial protection is maximized, but the manufacturing complexity increases
Solution Approach 1:
The base surface is segmented into a first region and a second region. The coating film is applied only to the first region, leaving the second region exposed. This segmentation simplifies the manufacturing process by reducing the coating application area, while still providing adequate antimicrobial protection to the critical first region where the coating is most needed.
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
Reduces the amount of antimicrobial agent while maintaining the antimicrobial effect, preventing peeling of the coating, and enhancing fixation and integration with the vertebral structure.
Implementation Method 1
a coating film disposed on the base and including a calcium phosphate-based material
Implementation Method 2
a coating film disposed on the base and including a calcium phosphate-based material and an antimicrobial agent
Data Source
AI summary
A spinal implant includes a base and a coating film disposed on the base and including a calcium phosphate-based material and an antimicrobial agent. A surface of the base includes a first region in which the coating film is disposed and a second region exposed from the coating film.