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Related Concept Videos

Method of Joints01:30

Method of Joints

The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint.
Since plane truss members are in the same plane, each joint is subjected to a coplanar and concurrent force system. To apply the method of joints, the first step is to...
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Cable Subjected to a Distributed Load

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: Problem Solving

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Distance Measurements by Taping01:18

Distance Measurements by Taping

Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
Taping Over Different Ground Profiles01:12

Taping Over Different Ground Profiles

Taping over varying ground profiles requires careful adaptation to achieve accurate measurements. On smooth, level ground with minimal vegetation, the tape can rest directly on the ground. Here, the taping team, typically consisting of a head and a rear tapeman, coordinates their positions with clear communication. The rear tapeman holds the tape at the starting point and guides the head tapeman toward a range pole placed beyond the endpoint, using hand or voice signals to ensure alignment.On...
Errors in Taping01:18

Errors in Taping

Errors in taping arise from multiple factors that can significantly impact measurement accuracy in surveying. Misalignment of the tape, often due to human error, is one primary source. A skilled rear tapeman, using a telescope, can help correct alignment by guiding the head tapeman; however, human limitations still lead to small inaccuracies. These errors may include misplacement of pins or inaccurate tape readings due to common visual confusions, such as mistaking a six for a nine. Such...

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Related Experiment Video

Updated: Jul 18, 2026

Preparation of Rat Tail Tendons for Biomechanical and Mechanobiological Studies
15:12

Preparation of Rat Tail Tendons for Biomechanical and Mechanobiological Studies

Published on: July 30, 2010

Technical considerations in manual and instrument tying techniques.

J D James1, M M Wu, E K Batra

  • 1Department of Plastic Surgery, University of Virginia School of Medicine, Charlottesville 22908.

The Journal of Emergency Medicine
|July 1, 1992
PubMed
Summary

Instrument ties create secure granny and square knots in nylon sutures, failing by breakage. Manual square knots are secure, but manual granny knots often slip, indicating technique impacts surgical knot security.

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Area of Science:

  • Surgical techniques
  • Materials science
  • Biomedical engineering

Background:

  • Surgical knots are crucial for wound closure and device fixation.
  • Knot security is paramount to prevent complications like slippage and dehiscence.
  • Nylon sutures are commonly used in various surgical procedures.

Purpose of the Study:

  • To compare the security of granny and square knots tied using two-hand (manual) versus instrument tie techniques.
  • To evaluate knot security in both multifilament and monofilament nylon sutures.
  • To determine failure modes (breakage vs. slippage) associated with different knot types and tying methods.

Main Methods:

  • Construction of granny and square knots using both two-hand (manual) and instrument tie techniques.
  • Utilizing both multifilament and monofilament nylon sutures for knot construction.
  • Assessing knot security through standardized testing to observe failure modes.

Main Results:

  • Instrument tie techniques consistently produced secure granny and square knots, with failures occurring due to suture breakage.
  • Two-hand (manual) tie techniques resulted in secure square knots, also failing by breakage.
  • Granny knots tied manually exhibited unreliable security, frequently failing by slippage.

Conclusions:

  • Instrument tying is a reliable method for achieving secure knots with nylon sutures, minimizing slippage risk.
  • While manual square knots offer good security, manual granny knots are prone to slippage and should be used with caution.
  • Surgical technique significantly influences knot security, impacting the overall integrity of surgical closures.