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Related Concept Videos

Mechanical Systems01:22

Mechanical Systems

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Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
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A Robotic System for Actively Stiffening Flexible Manipulators.

Paul M Loschak1, Stephen F Burke1, Emiko Zumbro1

  • 1Harvard Paulsen School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.

Proceedings of the ... IEEE/RSJ International Conference on Intelligent Robots and Systems. IEEE/RSJ International Conference on Intelligent Robots and Systems
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This study introduces a novel robotic catheter system that actively adjusts stiffness for safer, more precise medical procedures. The system enhances control during minimally invasive interventions by enabling variable force application on tissues.

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Area of Science:

  • Robotics
  • Biomedical Engineering
  • Medical Devices

Background:

  • Flexible robotic manipulators, like catheters, offer safe navigation in vasculature but lack the stiffness for effective tissue interaction.
  • Existing manual methods for stiffness control are limited in precision and robotic adaptability.

Purpose of the Study:

  • To design and validate a robotic system for actively controlling the stiffness of a flexible manipulator.
  • To develop an analytical model for understanding vertebral segment interactions and stiffness modulation.
  • To enhance precision, safety, and workflow in minimally invasive procedures.

Main Methods:

  • A novel catheter design utilizing bead-shaped vertebrae and pull wires to actively modulate stiffness through controlled friction.
  • Development of an analytical model to predict stiffness based on system parameters.
  • Experimental validation of the model and system functionality through load-displacement measurements.

Main Results:

  • The developed analytical model accurately predicts catheter stiffness.
  • Experimental measurements confirmed the system's ability to achieve a stiffness range of 100 N/m to 800 N/m.
  • Demonstrated successful stiffness modulation for surgical tasks requiring tissue interaction.

Conclusions:

  • The actively stiffness-changing robotic catheter system provides a viable solution for improved control in minimally invasive procedures.
  • This technology enhances accuracy and safety during tissue manipulation in delicate anatomical regions.
  • The system's tunable stiffness bridges the gap between safe navigation and effective force application.