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Related Concept Videos

Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Stress Concentrations in Circular Shafts01:18

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Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
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Uniform Circular Motion01:14

Uniform Circular Motion

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Uniform circular motion is a specific type of motion in which an object travels in a circle with a constant speed. For example, any point on a propeller spinning at a constant rate is undergoing uniform circular motion. The second, minute, and hour hands of a watch also undergo uniform circular motion. It is hard to believe that points on these rotating objects are actually accelerating, even though the rotation rate is constant. To understand this, we must analyze the motion in terms of...
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Non-uniform Circular Motion01:22

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In uniform circular motion, the particle executing circular motion has a constant speed, and the circle is at a fixed radius. However, not all circular motion occurs at a constant speed. A particle can travel in a circle and speed up or slow down, showing an acceleration in the direction of motion. In that case, the motion is called non-uniform circular motion, and an additional acceleration is introduced, which is in the direction tangential to the circle. 
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Dynamics of Circular Motion01:30

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An object undergoing circular motion, like a race car, is accelerating because it is changing the direction of its velocity. This centrally directed acceleration is called centripetal acceleration. This acceleration acts along the radius of the curved path (thus is also referred to as radial acceleration).
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Reconstruction of Signal using Interpolation01:10

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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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Updated: Feb 15, 2026

Measuring Hypopharyngeal Gland Acinus Size in Honey Bee Apis mellifera Workers
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Hypopharyngeal reconstruction using a circular stapler.

P Schultz1, A Dupret-Bories2, S Ciftci1

  • 1Service d'ORL et de chirurgie cervico-faciale, hôpital de Hautepierre, avenue Molière, 67098 Strasbourg, France.

European Annals of Otorhinolaryngology, Head and Neck Diseases
|February 6, 2018
PubMed
Summary
This summary is machine-generated.

Using a circular stapler for hypopharyngeal reconstruction with tubed free flaps significantly reduces fistula and stenosis complications. This technique simplifies the procedure, eliminates the need for salivary stents, and allows for earlier feeding resumption.

Keywords:
AnastomosisCircular staplerFlapHypopharynx

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Area of Science:

  • Surgical Oncology
  • Otolaryngology
  • Plastic Surgery

Background:

  • Hypopharyngeal reconstruction after oncologic resection presents technical challenges, particularly in achieving a successful distal anastomosis.
  • Common complications at the flap-esophagus junction include fistula formation and stenosis, impacting patient recovery and functional outcomes.

Purpose of the Study:

  • To evaluate the efficacy of using a circular stapler for distal anastomosis in hypopharyngeal reconstruction using tubed free flaps.
  • To assess the impact of this technique on complication rates, specifically fistula and stenosis, and its effect on functional recovery.

Main Methods:

  • A retrospective series describing the indications and surgical procedure for hypopharyngeal reconstruction utilizing a circular stapler for anastomosis.
  • Comparison of outcomes between stapled anastomosis and traditional methods, focusing on flap survival, complication rates, and functional results.

Main Results:

  • Circular stapler use resulted in a perfectly circular and resistant suture line, significantly reducing the incidence of fistula and stenosis.
  • The technique obviated the need for salivary stent placement, enabling earlier resumption of oral feeding.
  • While the stapler is not specifically designed for this purpose, the procedure is technically straightforward with appropriate skill.

Conclusions:

  • Circular stapler anastomosis is a valuable technique for hypopharyngeal reconstruction, improving outcomes by minimizing common complications.
  • The forearm flap is considered the gold standard, though other flaps like the pectoralis major can be used with potentially less optimal healing and swallowing results.