Heparin Coating via Metal Coordination Complex
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Solution Overview
Problem
Current methods for binding heparin to substrates for hemocompatible coatings are complex, often requiring specific chemistries and can result in compromised functionality or instability, especially on non-plastic surfaces and during blood exposure.
Innovation Solution
A metal coordination complex is used to bind functional heparin directly to the substrate surface, forming a stable and flexible hemocompatible coating that maintains anticoagulant activity across various substrate materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If covalent attachment of heparin via linker or spacer unit is used, then heparin conformational flexibility is improved, but manufacturing complexity increases and substrate modification is required
Solution Approach 1:
The patent removes the linker/spacer component from the coating system entirely. Heparin is bound directly to the substrate surface through its native functional groups (carboxyl, hydroxyl, or sulfate groups) without requiring additional linker molecules or spacer units. This extraction of the intermediary component simplifies manufacturing while preserving heparin's conformational flexibility and anticoagulant function.
Solution Approach 2:
The patent enables heparin to serve multiple functions simultaneously: it provides anticoagulant activity, maintains conformational flexibility, and binds directly to diverse substrates (plastics, metals, ceramics) through its inherent functional groups. This eliminates the need for substrate-specific modification chemistries, making the coating process universally applicable across different material types.
2Ease of manufacture
If non-covalent methods such as physical adsorption or ionic interactions are used, then manufacturing simplicity is improved, but coating stability during blood exposure deteriorates
Solution Approach 1:
The patent changes the bonding parameter from weak non-covalent interactions (physical adsorption, ionic interactions) to strong covalent bonds. Heparin is chemically bonded directly to the substrate through its functional groups, creating a stable attachment that resists displacement during blood exposure while maintaining the simplicity of applying heparin solution to the substrate surface.
3Duration of action of moving object
If heparin is released from the device, then controlled period of antithrombogenicity is achieved, but heparin release into patient's body causes undesirable side effects
Solution Approach 1:
The patent applies a dense heparin coating layer beforehand that serves as a protective barrier, providing immediate and sustained antithrombogenic protection without requiring heparin release. The coating creates a permanent hemocompatible surface that prevents blood clotting through the exposed heparin functional groups, eliminating the need for systemic heparin administration and its associated side effects.
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
This approach provides a simple, cost-effective method for forming stable hemocompatible coatings that maintain heparin's functionality, reducing thrombosis incidence and improving biocompatibility on a wide range of substrates, including medical devices and nanoparticles.
Implementation Method 1
a metal coordination complex bonded to a surface of the substrate; and a functional heparin layer bonded directly to the metal coordination complex
Data Source
AI summary
The present invention relates to the coating of a range of functional heparins onto the surface of a substrate for which hemocompatibility is a key functional characteristic, such that the functionality of the functional heparin is maintained. The approach employs a metal coordination complex to bind to the substrate with the functional heparin binding to the metal coordination complex to thereby impart hemocompatibility.