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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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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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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...
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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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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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.
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...
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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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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Vascular Spasm01:16

Vascular Spasm

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The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last...
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Related Experiment Video

Updated: May 15, 2025

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Unilateral thermosensitive Janus hemostatic dressing for matching coagulation physiological processes.

Chuanjuan Chen1, Yicheng Zhang2, Siqi Chen2

  • 1Department of Nursing, The First Affiliated Hospital of Fujian Medical University, Fuzhou 350005, China.

Journal of Materials Chemistry. B
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Summary

This study introduces a novel Janus nonwoven fabric for hemostasis. This advanced material effectively manages bleeding emergencies by mimicking natural blood coagulation, significantly reducing blood loss in animal models.

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Area of Science:

  • Biomaterials Science
  • Hemostasis Research
  • Nanotechnology Applications

Background:

  • Hemostatic dressings manage bleeding by promoting blood coagulation.
  • Janus materials offer multifunctional capabilities through compartmentalized components.

Purpose of the Study:

  • To design a Janus nonwoven fabric with thermo-sensitivity for enhanced hemostasis.
  • To mimic the physiological process of blood coagulation for effective bleeding control.

Main Methods:

  • Fabrication of a Janus nonwoven fabric with poly(N-isopropylacrylamide) (PNIPAM) and bioactive glass (BG) sides.
  • Evaluation of the material's phase transition and hemostatic performance in a rat femoral artery model.

Main Results:

  • The Janus material demonstrated rapid thermo-induced phase transition, adsorbing blood and aggregating hemocytes.
  • The bioactive glass side released ions to accelerate coagulation.
  • Significantly reduced blood loss (0.15 g) compared to conventional hemostatic gauzes (17.4-20.0% less).

Conclusions:

  • The Janus BG-PNIPAM fabric effectively controls bleeding by synergistically combining PNIPAM's thermo-sensitivity and BG's pro-coagulant properties.
  • The material's rapid, temperature-triggered response and proven biosafety suggest significant potential for clinical hemostasis applications.