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Related Concept Videos

Bipolar Disorder01:30

Bipolar Disorder

Bipolar disorder is a chronic mental health condition marked by significant mood fluctuations, including episodes of mania and depression. Elevated energy levels, heightened mood or irritability, impulsive behavior, reduced sleep needs, rapid speech, racing thoughts, inflated self-esteem, and distractibility characterize mania. Individuals with bipolar disorder often alternate between depressive and manic states, with periods of emotional stability lasting an average of six months to a year.
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
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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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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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Thromboembolic Disorders
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Updated: Jun 8, 2026

Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)
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Historical development of bipolar coagulation.

Stephen L Barrett1, Joseph M Vella, A Lee Dellon

  • 1Midwestern University College of Health Services, Arizona Pediatric Medicine Program, Glendale, AZ, USA. slbarrettpod@me.com

Microsurgery
|September 16, 2010
PubMed
Summary

The unipolar electrocautery device, invented in 1926, revolutionized surgery but introduced risks. A bipolar electrocautery device was later developed to address these safety concerns.

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Area of Science:

  • Medical Technology
  • Surgical Innovation
  • Electrosurgery

Background:

  • The invention of the unipolar electrocautery device by William T. Bovie in 1926 marked a significant advancement in surgical procedures.
  • This device enabled simultaneous surgical incision and hemostasis, transforming surgical capabilities.

Observation:

  • The unipolar electrocautery device, while revolutionary, presented new operational risks, including electrical burns and fires within the operating room.
  • These inherent dangers necessitated the development of alternative solutions to enhance patient and staff safety.

Findings:

  • The development of the bipolar electrocautery device emerged as a direct response to the safety challenges posed by its unipolar predecessor.
  • Understanding the principles of both unipolar and bipolar electrocautery is crucial for appreciating their respective roles and advancements in surgical practice.

Implications:

  • The evolution from unipolar to bipolar electrocautery highlights a continuous drive towards safer and more effective surgical tools.
  • This progression underscores the importance of addressing technological risks to improve patient outcomes and operating room safety.