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Related Concept Videos

Introduction to Hemostasis01:05

Introduction to Hemostasis

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Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized,...
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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Formation of the Platelet Plug01:22

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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
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Coagulation01:09

Coagulation

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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
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Coagulation01:06

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Clot Retraction and Fibrinolysis01:16

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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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Comparative analyses of the hemostatic efficacy and surgical device performance of powdered oxidized regenerated cellulose and starch-based powder formulations.

Research and practice in thrombosis and haemostasis·2025
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Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
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Absorbable Hemostatic Aggregates.

Allen Y Wang, Joseph Rafalko, Melinda MacDonald1

  • 1Preclinical Center of Excellence, Johnson & Johnson Medical Devices Companies, Route 22 West, Somerville, New Jersey 08876-0151, United States.

ACS Biomaterials Science & Engineering
|January 15, 2021
PubMed
Summary

A novel powdered oxidized regenerated cellulose (ORC) hemostat shows superior performance in controlling surgical bleeding. Its unique aggregate structure enhances coagulation more effectively than fine fibers or starch-based alternatives.

Keywords:
bactericidalhemostatoxidized regenerated cellulosepowdersurface energy

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Area of Science:

  • Biomaterials Science
  • Surgical Hemostasis
  • Regenerative Medicine

Background:

  • Topical absorbable hemostats are crucial for managing intraoperative bleeding.
  • Oxidized regenerated cellulose (ORC) is a common hemostatic material.
  • Existing ORC hemostats offer valuable but improvable hemostatic properties.

Purpose of the Study:

  • To evaluate a novel powdered form of ORC as a hemostat.
  • To compare its hemostatic efficacy against its constituent fine fibers and starch-based hemostats.
  • To understand the factors influencing the hemostatic performance of the powdered ORC.

Main Methods:

  • Characterization of the novel powdered ORC, focusing on morphology and surface energetics.
  • Comparative analysis of coagulation promotion by ORC aggregates versus ORC fine fibers.
  • Evaluation of hemostatic efficacy against starch-based particles.

Main Results:

  • The powdered ORC, composed of aggregates, demonstrated enhanced hemostatic performance.
  • ORC aggregates promoted coagulation more effectively than fine ORC fibers due to superior surface energetics and area.
  • Higher sphericity in ORC aggregates correlated with improved coagulation efficacy.
  • ORC aggregates outperformed starch-based hemostatic particles in promoting clot formation.

Conclusions:

  • The novel powdered ORC hemostat offers improved hemostatic characteristics.
  • Its efficacy is attributed to its chemical composition, aggregate morphology, and surface energetics.
  • This powdered ORC represents a promising advancement in surgical hemostasis.