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Three-Dimensional Force System:Problem Solving01:30

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A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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Force model for laparoscopic graspers: implications for virtual simulator design.

K Susmitha Wils1,2, Suresh R Devasahayam1, M Manivannan3

  • 1a Department of Bioengineering , Christian Medical College Vellore , Tamil Nadu , India.

Minimally Invasive Therapy & Allied Technologies : MITAT : Official Journal of the Society for Minimally Invasive Therapy
|November 15, 2016
PubMed
Summary
This summary is machine-generated.

A new laparoscopic grasper force model was developed and validated. This model accurately predicts forces, enabling safer surgical training with virtual simulators and improved instrument design.

Keywords:
Laparoscopic graspersforce modelforce transmissionlaparoscopic pinchingvirtual simulator

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Area of Science:

  • Biomedical Engineering
  • Surgical Technology

Background:

  • Laparoscopic graspers lack haptic feedback, increasing the risk of tissue damage.
  • Virtual reality simulators can train surgeons to improve grasp safety.
  • Accurate grasper force models are crucial for developing effective force-feedback simulators.

Purpose of the Study:

  • To develop a theoretical force model for laparoscopic graspers based on grasper mechanics.
  • To experimentally validate the developed force model during simulated laparoscopic procedures.

Main Methods:

  • A force model was created for single and double jaw laparoscopic graspers.
  • Instrumented graspers measured forces and handle angles during tissue grasping.
  • Porcine abdominal tissues were used for experimental validation.
  • Intra-class correlation coefficient (ICC) assessed the agreement between calculated and experimental forces.

Main Results:

  • The force model demonstrated excellent agreement with experimental data (ICC ≥ 0.8) for all tissue types.
  • Calculated and experimental tip forces showed high correlation across gallbladder, liver, and spleen grasps.
  • Specific force values were reported for different graspers and tissues, validating the model's predictive capability.

Conclusions:

  • The developed laparoscopic grasper force model is effective for simulating pinching actions.
  • This model can enhance the design of virtual reality surgical simulators with force feedback.
  • The model also offers potential for improving the ergonomic design of laparoscopic instruments.