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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Plastic Deformation in Circular Shafts01:20

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Deformation in a Circular Shaft01:10

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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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Design of Transmission Shafts - Stress Analysis01:15

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Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
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Concept design and simulation study on a "phantom" anvil for circular stapler.

Francesco Rulli1, Alex Kartheuser, Sasan Amirhassankhani

  • 1*Department of Clinical Sciences and Translational Medicine, University of Rome "Tor Vergata" §Department of Enterprise Engineering, University of Rome "Tor Vergata," Rome, Italy †Colorectal Surgery Unit, Department of Abdominal Surgery and Transplantation Cliniques Universitaires Saint-Luc, Université Catholique de Louvain (UCL), Brussels, Belgium ‡Catholic University "Nostra Signora del Buon Consiglio," Tirana, Albania.

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Summary
This summary is machine-generated.

A novel "phantom" anvil design reduces rectal injury risks during colorectal surgery. Computer simulations show this device significantly lowers stress, improving stapler advancement and patient safety in double-stapling techniques.

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Area of Science:

  • Colorectal Surgery
  • Surgical Device Design
  • Biomechanical Engineering

Background:

  • Intraoperative double-stapling technique complications are underreported.
  • Rectal injuries can occur during circular stapler insertion and advancement.
  • Existing techniques pose risks of colorectal injury and neoplastic dissemination.

Purpose of the Study:

  • To design and optimize a "phantom" anvil to mitigate challenges in rectal stapler insertion.
  • To enhance safety and reduce complications associated with circular stapler use in colorectal procedures.
  • To improve the ease of stapler advancement through the rectum.

Main Methods:

  • Computer-aided modeling and finite element analysis were employed for device design.
  • The "phantom" anvil design focused on internal shape for gun connection and cap shape for rectal insertion.
  • Optimization aimed to prevent colorectal injuries, neoplastic dissemination, and reduce fecal contamination.

Main Results:

  • Numerical simulations demonstrated that optimized fillet radii can reduce stress by over 90%.
  • Both top and bottom fillet radii significantly influence local stress in the colon rectum.
  • The design effectively addresses stress concentrations during stapler advancement.

Conclusions:

  • A dismountable "phantom" anvil facilitates safer stapler insertion and advancement.
  • This auxiliary device allows dedicated shape optimization without modifying the main stapler.
  • Computer-aided simulations are crucial for optimizing surgical device design for patient safety and procedural efficiency.