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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
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In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
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Upward Impending Motion01:21

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
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Wood Fasteners01:18

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In wood construction, fasteners are essential for securing components together, with the connection strength largely dependent on the direct bearing between members. Various types of fasteners are employed, each suited to specific applications and structural requirements.
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Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
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Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects
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Development and initial validation of a novel undercut thread design for locking screws.

Xiaoreng Feng1, Sheng Zhang2, Hongfeng Liang3

  • 1Department of Orthopaedics and Traumatology, Yangjiang People's Hospital, Yangjiang, 529500, China; Division of Orthopaedics and Traumatology, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.

Injury
|March 7, 2022
PubMed
Summary

A novel locking screw thread design with an undercut feature demonstrates superior fixation stability and migration resistance in osteoporotic bone compared to traditional buttress threads.

Keywords:
Buttress threadFixation stabilityLateral migration resistanceLocking screwUndercut thread

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Area of Science:

  • Orthopedic biomechanics
  • Biomaterials engineering
  • Surgical implant design

Background:

  • Locking screws with buttress threads exhibit high failure rates in osteoporotic bone.
  • Osteoporotic bone fractures pose significant challenges for implant fixation.

Purpose of the Study:

  • To develop and evaluate a novel locking screw thread design.
  • To compare the fixation stability of the novel thread against a standard buttress thread in osteoporotic bone models.

Main Methods:

  • Manufacture of novel undercut thread and buttress thread locking screws from stainless steel.
  • Biomechanical testing including lateral migration, cyclic craniocaudal, and torsional loading in osteoporotic bone substitute with locking plates.
  • Finite element analysis (FEA) to assess stress distribution in adjacent bone tissue.

Main Results:

  • The novel thread design exhibited significantly higher lateral migration strength.
  • The novel thread required more cycles and higher forces/torque to resist migration compared to the buttress thread.
  • FEA revealed more even stress distribution in adjacent bone tissue with the novel thread.

Conclusions:

  • The novel undercut locking screw thread provides superior lateral migration resistance.
  • Enhanced fixation stability was observed with the novel thread when used with a locking plate under various loading conditions.
  • The novel thread design offers improved performance over traditional buttress threads for osteoporotic bone applications.