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Comprehending Optimality of Finger Flexor Tendon Pulley System Using Computational Analysis.

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  • 1Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India.

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This study reveals optimal configurations for finger tendon-pulley systems (TPS) by analyzing biological designs. Findings can improve prosthetic hands and surgical reconstructions for better flexion and reduced stress.

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Area of Science:

  • Biomechanics
  • Biomedical Engineering
  • Robotics

Background:

  • Existing prosthetic and orthotic designs seldom incorporate the kinetostatics of biological finger tendon-pulley systems (TPS).
  • The optimality of biological TPS as a design reference remains largely unexplored.

Purpose of the Study:

  • To investigate optimal tendon-pulley system (TPS) configurations for finger flexor mechanisms.
  • To determine if biological TPS designs are optimal and in what sense, guiding prosthetic and orthotic development.

Main Methods:

  • A parametric study was conducted using a computational model of a compliant, flexure-based finger.
  • The pseudo-rigid body method simulated various pulley/tendon attachment points, heights, and widths.
  • Analysis focused on achieving high flexion range with low tendon tension, bowstringing, and pulley stresses.

Main Results:

  • Three optimal TPS configurations were identified: single stiff pulley, two stiff pulleys, or one stiff and one flexible-inextensible pulley per phalange.
  • Biological-like TPS configurations require flexible-inextensible distal pulleys on proximal and intermediate phalanges, mimicking joint and cruciate pulleys.
  • Optimal designs balance flexion range with minimized actuation tension, bowstringing, and pulley stress.

Conclusions:

  • Biological flexor TPS may have evolved for maximal flexion with minimal tension and stress.
  • Findings offer valuable insights for designing efficient hand prosthetics and improving TPS reconstruction surgery.