Oxidized cellulose, gelatin, and collagen hemostats represent the three most widely used base materials in the mechanical hemostat category. Each material has a distinct origin, physical structure, and handling profile, though all three share the same general goal of providing a scaffold that supports the body's natural clotting process at a bleeding surgical surface.
This article offers general educational background on these material classes. It does not describe any single branded product's specific indications; refer to the applicable Instructions for Use (IFU) for product-specific information.
What Is Oxidized Cellulose?
Oxidized cellulose, sometimes referred to as oxidized regenerated cellulose, is a plant-derived material processed into fabric-like sheets, knitted mesh, or powder forms. When applied to a bleeding surface, it is thought to support clot formation partly through a physical scaffold effect and partly through the acidic, low-pH environment created as the material breaks down, which can contribute to a bactericidal effect in some formulations.
- Commonly supplied in sheet or fibrillar forms that can be cut to size
- Often used to line resection surfaces in general and gynecologic surgery
- Designed to be absorbed by the body over a period of weeks
What Is Gelatin-Based Hemostatic Material?
Gelatin hemostats are derived from purified animal (typically porcine) collagen processed into a sponge, powder, or matrix form. When gelatin material contacts a bleeding surface and absorbs fluid, it swells and provides a physical framework that concentrates platelets, supporting clot formation.
- Available as compressible sponges or as a flowable matrix when combined with a liquid carrier
- Gelatin matrices are frequently combined with an active thrombin component to create a flowable hemostat
- Generally absorbed by the body over a period of weeks depending on the amount used and the application site
What Is Collagen-Based Hemostatic Material?
Collagen hemostats are derived from purified animal collagen (often bovine or equine) and are available in sponge, sheet, felt, or powder configurations. Collagen is a natural stimulus for platelet activation and aggregation, so exposed collagen fibers at a bleeding surface can support the clotting process directly.
- Often selected for parenchymal organ surfaces such as liver or spleen
- Some formulations are combined with thrombin for a more active hemostatic effect
- Generally designed for absorption over time following application
How Do Surgeons Choose Among These Materials?
Selection among oxidized cellulose, gelatin, and collagen-based products depends on factors such as the bleeding surface type, tissue geometry, surgeon familiarity, institutional stocking, and whether an active component (such as thrombin) is combined with the base material. All three material classes fall under the broader mechanical hemostat category, meaning they primarily support — rather than replace — the natural coagulation cascade.
Frequently Asked Questions
Are these materials permanent implants?
No. Oxidized cellulose, gelatin, and collagen hemostatic materials are generally designed to be gradually absorbed by the body over time rather than remaining as permanent implants, though absorption timelines vary by product and clinical setting.
Can these materials be used in patients with allergies?
Because gelatin and collagen products are derived from animal sources, patients with known sensitivities to bovine, porcine, or other relevant animal proteins should have this discussed with their surgical team beforehand. Refer to the specific product IFU for contraindication information.
Is one material generally preferred over the others?
No single material is universally preferred. Each has different handling characteristics, and surgeons often select based on the specific bleeding surface, tissue type, and their own clinical experience with a given product.
Related INVAMED Resources
- Explore INVAMED's Hemostatic / Tissue Sealant Solutions product category
- Learn more about Types of Topical Hemostatic Agents Explained
- Review Mechanical vs. Active vs. Flowable Hemostats
Medical Disclaimer: This article is provided for general informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment recommendation. It is not a substitute for consultation with a qualified healthcare professional. Product indications, availability, and regulatory status vary by country. Always refer to the official Instructions for Use (IFU) and consult a licensed physician for guidance specific to your situation. INVAMED devices are intended for use by trained healthcare professionals.