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Related Concept Videos

Aneurysm I: Introduction01:30

Aneurysm I: Introduction

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An aortic aneurysm is a localized outpouching or dilation at a weak point in the artery wall. It may involve different parts of the aorta, such as the abdominal aorta, aortic arch, or thoracic aorta.Etiological factorsSeveral disorders are associated with aortic aneurysms.Congenital causes, such as primary connective tissue disorders like Marfan syndrome, impact the integrity and strength of connective tissues, notably affecting the aorta. Marfan syndrome is a genetic disorder that specifically...
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Aneurysm IV: Nursing Management01:22

Aneurysm IV: Nursing Management

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Vigilant monitoring for aneurysm rupture is essential for patients undergoing aortic surgery.Preoperative Nursing ManagementContinuously monitor the patient for manifestations of aneurysm rupture, such as pallor, weakness, tachycardia, hypotension, abdominal, back, groin, or periumbilical pain, changes in consciousness, and a pulsating abdominal mass. Regularly assess the patient's peripheral pulses.Instruct the patient to consume a clear liquid diet the day before surgery and administer...
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Aneurysm III: Interprofessional Care01:26

Aneurysm III: Interprofessional Care

316
Aneurysm management involves either conservative medical therapy or surgical intervention, depending on the size and symptoms of the aneurysm. Conservative management is generally reserved for smaller, asymptomatic aneurysms, while larger or symptomatic aneurysms often necessitate surgical repair.Conservative Medical TherapyFor small, asymptomatic aneurysms, particularly abdominal aortic aneurysms (AAA) less than 5.5 centimeters in diameter, conservative medical therapy is recommended. This...
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Aneurysm II: Clinical Manifestations and Diagnostic Studies01:21

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Thoracic, aortic arch and abdominal aneurysms are significant vascular conditions that can present with various clinical manifestations and lead to serious complications. Understanding these manifestations and the appropriate diagnostic studies is essential for effective management and treatment.Thoracic Aortic AneurysmsThoracic aortic aneurysms often remain asymptomatic until they reach a size that impinges on adjacent structures. They typically cause deep, diffuse chest pain that radiates to...
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Related Experiment Video

Updated: Feb 12, 2026

Microsurgical Clip Obliteration of Middle Cerebral Aneurysm Using Intraoperative Flow Assessment
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Zirconia-Polyurethane Aneurysm Clip.

Won-Sang Cho1, Kyung-Il Cho2, Jeong Eun Kim1

  • 1Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.

World Neurosurgery
|March 31, 2018
PubMed
Summary
This summary is machine-generated.

A new zirconia clip (ZC) significantly reduces magnetic resonance (MR) imaging artifacts caused by metal aneurysm clips. While offering strong closing forces, its narrow blade opening requires further development for optimal clinical use.

Keywords:
Cerebral aneurysmsClipsPolyurethaneSusceptibility artifactZirconia

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Area of Science:

  • Biomaterials Engineering
  • Medical Imaging
  • Neurosurgery

Background:

  • Metal aneurysm clips cause significant susceptibility artifacts in Magnetic Resonance (MR) imaging.
  • These artifacts hinder the evaluation of clipped aneurysms, parent arteries, and surrounding brain tissue.
  • Developing MR-compatible clips is crucial for improved post-procedural assessment.

Purpose of the Study:

  • To develop and evaluate an MR-compatible aneurysm clip prototype.
  • To compare the artifact volumes and mechanical properties of the prototype with existing commercial metal clips.

Main Methods:

  • A prototype zirconia clip (ZC) with a polyurethane spring was designed and fabricated.
  • Mechanical properties (closing force, blade opening) were measured.
  • In vitro and in vivo artifact volumes were quantified using 3 Tesla MR imaging in a canine venous pouch aneurysm model, comparing ZC against Yasargil (YC) and Sugita (SC) clips.

Main Results:

  • The ZC exhibited significantly smaller in vitro (1.9x) and in vivo (2.6x) artifact volumes compared to YC (26.9x, 21.4x) and SC (29.7x, 29.4x) relative to real volumes.
  • ZC demonstrated satisfactory closing forces, comparable to commercial clips.
  • The maximum blade opening width of ZC (3.0 mm) was considerably narrower than YC (6.8 mm) and SC (9.0 mm).

Conclusions:

  • The developed zirconia clip (ZC) shows promise for reducing MR imaging artifacts.
  • ZC offers adequate closing forces for aneurysm clipping.
  • The limited blade opening width of ZC is a key limitation that needs to be addressed in future iterations.