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Related Concept Videos

Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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...
Introduction to Hemostasis01:05

Introduction to Hemostasis

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.
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Coagulation01:09

Coagulation

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.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
Coagulation01:06

Coagulation

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...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
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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.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...

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Artificial Lung Device Priming for In Situ Fiber Bundle Surface Grafting
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Hemostatic multilayer coatings.

Anita Shukla1, Jean C Fang, Sravanthi Puranam

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Advanced Materials (Deerfield Beach, Fla.)
|January 7, 2012
PubMed
Summary
This summary is machine-generated.

This study developed spray-assembled hemostatic films containing thrombin and tannic acid. These innovative films, when coated onto gelatin sponges, achieve rapid and effective bleeding control in a preclinical model.

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Area of Science:

  • Biomaterials Science
  • Hemostasis Research
  • Nanotechnology Applications

Background:

  • Effective hemostatic agents are crucial for managing surgical bleeding.
  • Current treatments may have limitations in speed and efficacy.
  • Gelatin sponges are widely used but can be enhanced for improved hemostatic properties.

Purpose of the Study:

  • To develop advanced hemostatic films using spray layer-by-layer assembly.
  • To incorporate thrombin and tannic acid into these films for enhanced procoagulant activity.
  • To evaluate the hemostatic performance of coated gelatin sponges in a bleeding model.

Main Methods:

  • Utilized spray layer-by-layer assembly for film fabrication.
  • Coated commercial porous gelatin sponges with the hemostatic films.
  • Assessed hemostasis in a porcine spleen bleeding model.

Main Results:

  • Successfully created hemostatic films containing thrombin and tannic acid.
  • Demonstrated effective coating of gelatin sponges via spray assembly.
  • Achieved instantaneous hemostasis in the porcine spleen model.

Conclusions:

  • Spray layer-by-layer assembly is a viable method for creating effective hemostatic films.
  • Coated gelatin sponges show significant potential for rapid bleeding control.
  • This approach offers a promising strategy for advanced hemostatic devices.