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Overview of the Cardiovascular System01:14

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The cardiovascular system is a vital transportation system in the body. It comprises the heart and blood vessels and facilitates the exchange of gases, nutrients, and waste products.
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Language, whether spoken, signed, or written, consists of specific components: lexicon and grammar. The lexicon is the vocabulary of a language, comprising its words. Grammar is the set of rules used to convey meaning through the lexicon. For example, English grammar adds “-ed” to most verbs to indicate past tense. Words are formed by combining phonemes, which are the basic sound units of a language. Different languages have different sets of phonemes (e.g., “ah” vs.
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Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
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Tunable Elastomers with an Antithrombotic Component for Cardiovascular Applications.

Alexander M Stahl1,2, Yunzhi Peter Yang2,3,4

  • 1Department of Chemistry, Stanford University, Stanford, CA, 94305, USA.

Advanced Healthcare Materials
|June 2, 2018
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Summary

Researchers developed new biodegradable polyurethanes for cardiovascular tissue engineering. These materials incorporate dipyridamole, improving biocompatibility and reducing platelet activation for medical devices.

Keywords:
antithromboticsbiodegradablecardiovascular tissue engineeringelastomerspolyurethane

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Cardiovascular Engineering

Background:

  • Biodegradable polymers are crucial for tissue engineering scaffolds.
  • Developing thromboresistant materials for blood-contacting devices remains a challenge.
  • Polyurethanes offer tunable properties but require enhanced biocompatibility for cardiovascular applications.

Purpose of the Study:

  • To create novel biodegradable polyurethanes for cardiovascular tissue engineering.
  • To covalently incorporate the antiplatelet agent dipyridamole into these polyurethanes.
  • To evaluate the materials' biocompatibility, mechanical properties, and drug release characteristics.

Main Methods:

  • Synthesized biodegradable polyurethanes by incorporating dipyridamole into polycaprolactone-based polymers.
  • Controlled polymer properties by adjusting the ratio of dipyridamole to diisocyanate and polycaprolactone macromer.
  • Characterized material properties including mechanical strength, elasticity, drug distribution, and release kinetics.
  • Assessed in vitro cell proliferation (endothelial and smooth muscle cells) and platelet adhesion/activation.

Main Results:

  • Achieved tunable mechanical strength, elasticity, and elastic moduli comparable to native cardiovascular tissues.
  • Demonstrated homogeneous distribution and slow release of dipyridamole throughout polymer degradation.
  • Observed inverse relationship between cross-link density and elastic modulus due to reduced crystallinity.
  • Showed reduced platelet adhesion and activation, supporting thromboresistance.
  • Confirmed support for endothelial and vascular smooth muscle cell proliferation.

Conclusions:

  • Developed biocompatible, biodegradable polyurethanes with tunable mechanical properties for cardiovascular tissue engineering.
  • Covalent incorporation of dipyridamole significantly improved thromboresistance.
  • These novel materials show promise as substrates for cardiovascular medical devices and tissue-engineered scaffolds.