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Introduction to Hemostasis01:05

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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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Janus Self-Propelled Chitosan-Based Hydrogel Spheres for Rapid Bleeding Control.

Qiao Yu1,2,3, Baihai Su1,3, Weifeng Zhao3,4

  • 1Department of Nephrology, West China Hospital, Sichuan University, Chengdu, 610041, China.

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This study introduces a novel self-propelled hydrogel hemostat (J-CMH@CaCO3/T) for severe bleeding. This innovative material rapidly halts hemorrhage by releasing calcium ions and generating bubbles, significantly improving hemostatic efficiency.

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Area of Science:

  • Biomaterials Science
  • Hemostasis Research
  • Nanotechnology Applications

Background:

  • Uncontrolled hemorrhage is a leading cause of preventable trauma deaths.
  • Current hemostats struggle with noncompressible and irregularly shaped wounds.
  • Need for advanced hemostatic agents with enhanced properties like self-propulsion and ion release.

Purpose of the Study:

  • To develop a Janus self-propelled chitosan-based hydrogel hemostat (J-CMH@CaCO3/T).
  • To evaluate its hemostatic efficiency, blood absorption, and clot-promoting capabilities.
  • To investigate its potential for clinical application in trauma management.

Main Methods:

  • Fabrication of Janus self-propelled chitosan-based hydrogel with CaCO3 (J-CMH@CaCO3) via ionic crosslinking, settlement, and photopolymerization.
  • Integration of protonated tranexamic acid (T) to create J-CMH@CaCO3/T.
  • In vitro assessment of blood absorption, clotting ability, and hemocompatibility.
  • In vivo evaluation in rodent and rabbit bleeding models.

Main Results:

  • J-CMH@CaCO3/T demonstrated high blood absorption and effective clot formation.
  • Self-propulsion via bubble generation and Ca2+ release accelerated hemostasis.
  • Hemorrhage was rapidly halted within 39 seconds in animal models.
  • The hemostat showed acceptable hemocompatibility and cytocompatibility.

Conclusions:

  • J-CMH@CaCO3/T exhibits superior hemostatic performance compared to existing agents.
  • The self-propelled mechanism offers a novel approach for managing severe bleeding.
  • This hydrogel presents a promising new avenue for developing advanced clinical hemostats.