Hemocompatibility Testing
How Hemocompatibility Testing Is Performed
PzF is a polymer coating technology used to modify the surface of medical devices, including devices that contact blood. The coating is applied as a very thin film to create a surface that differs from the underlying device material.
PzF coatings are of interest for blood-contacting devices because the first biological interactions between blood and a device occur at the surface. By changing the outermost surface chemistry, a coating can influence how proteins, platelets, and other blood components interact with the device during bench and preclinical evaluation.
Why Surface Chemistry Matters
Medical devices are commonly made from materials such as nitinol, stainless steel, PET, ePTFE, Pebax, polyurethane, silicone, polycarbonate, and other polymers or metals. These materials are selected for mechanical performance, manufacturability, flexibility, strength, radiopacity, or other design requirements. However, the best structural material for a device is not always the best blood-contacting surface.
A surface coating can allow developers to keep the mechanical and structural properties of the base device while modifying the blood-contacting interface.
Types of Antithrombotic Coating Approaches
Antithrombotic coatings can be broadly grouped into several categories:
Passive surface-modifying coatings
These coatings are intended to create a more blood-compatible interface without relying on a drug-eluting or actively released compound.
Heparin-based coatings
These coatings use heparin or heparin-like chemistry to influence coagulation-related interactions at the device surface.
Hydrophilic coatings
Some hydrophilic surfaces are used to reduce friction, improve lubricity, or modify protein interactions.
Drug-eluting or bioactive coatings
Some coatings incorporate active pharmaceutical or biological agents intended to influence local biological response.
Polymer thin-film coatings
Thin polymer coatings may be used to modify the outermost surface chemistry while minimizing changes to device geometry or mechanical performance.
Antithrombotic Coating Evaluation
A coating cannot be evaluated based on chemistry alone. Developers typically need to consider both coating performance and device-specific biological response. Testing may include coating thickness, coating coverage, adhesion, durability, particulate generation, surface characterization, and hemocompatibility endpoints.
For blood-contacting devices, hemocompatibility evaluation may include assessments related to thrombosis, coagulation, platelet response, hemolysis, complement activation, and hematology parameters. The appropriate test strategy depends on the device type, duration of blood contact, clinical use, and regulatory pathway.
How Alta Biomed Supports Antithrombotic Coating Development
Alta Biomed specializes in PzF coating technology and hemocompatibility testing support for blood-contacting medical devices. Our team works with device developers to evaluate coating feasibility, coating application methods, surface compatibility, coating integrity, and blood-contacting device performance in preclinical bench models such as in vitro human blood flow loops.
We support early feasibility through development-stage evaluations for devices such as vascular implants, heart valves, stents, grafts, shunts, catheter-based devices, filters, and other blood-contacting technologies.
Interested In Evaluating a Coating for Your Device
Contact Alta Biomed to discuss hemocompatibility testing options.
6070 Corte Del Cedro, Unit A
Carlsbad, CA 92011