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Related Concept Videos

Tension01:10

Tension

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Tension is a force along the length of a medium, in particular, a force carried by a flexible medium, such as a rope or cable. The word "tension" comes from Latin, meaning "to stretch". Not coincidentally, the flexible cords that carry muscle forces to other parts of the body are called tendons. Any flexible connector, such as a string, rope, chain, wire, or cable, can exert pull only parallel to its length; so, a force carried by a flexible connector is a tension with a...
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The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
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Cable Subjected to Concentrated Loads01:28

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Flexible cables are commonly used in various applications for support and load transmission. Consider a cable fixed at two points and subjected to multiple vertically concentrated loads. Determine the shape of the cable and the tension in each portion of the cable, given the horizontal distances between the loads and supports.
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When dealing with a cable that is fixed to two supports and subjected to uniform loading, it is crucial to determine the maximum tension in the cable. This process can be broken down into several key steps, as outlined below:
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Torque01:10

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
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Tying different knots: what forces do we use?

S P Rodrigues1, T Horeman, J Dankelman

  • 1Department of Gynecology, K6-76, Leiden University Medical Center, PO Box 9600, 2300 RC, Leiden, The Netherlands, S.P.Rodrigues@lumc.nl.

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Summary
This summary is machine-generated.

Expert surgeons use more force in laparoscopic surgery than conventional surgery, even with similar techniques. This study highlights the need for enhanced force feedback during surgical training to improve skill acquisition.

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Area of Science:

  • Surgical techniques
  • Biomechanics
  • Medical simulation

Background:

  • Investigating differences in applied interaction force between conventional open surgery and laparoscopic surgery.
  • Focus on suturing tasks in a non-clinical setting.

Purpose of the Study:

  • To quantify and compare the interaction forces applied during suturing and knot-tying in laparoscopic versus conventional surgery.
  • To identify factors contributing to force differences in surgical training models.

Main Methods:

  • Experts performed intracorporeal and extracorporeal sutures and instrument-tie/one-hand square knots in laparoscopic and conventional training setups, respectively.
  • Force exertion (mean, non-zero, maximum, volume) and task completion time were measured on an artificial skin model.
  • Suturing tasks were analyzed in two phases: needle driving (Phase 1) and knot-tying (Phase 2).

Main Results:

  • Laparoscopic suturing exhibited significantly higher force values than conventional suturing in Phase 1.
  • Phase 2 revealed significantly higher mean non-zero and maximum forces for intracorporeal knots compared to instrument-tie knots, and for extracorporeal knots compared to one-hand square knots.
  • Laparoscopic procedures, including suturing and knot-tying, required longer completion times compared to conventional methods.

Conclusions:

  • Expert surgeons apply greater force during laparoscopic procedures than conventional surgery, irrespective of technique.
  • Limited visual and haptic feedback in laparoscopy hinders accurate assessment of applied interaction force.
  • Implementing additional force feedback during non-clinical surgical training may enhance skill development and force perception.