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Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol
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Low-speed instrumented drill press for bone screw insertion.

J Logan Betts1,2, Frank M Brinkley1,2, Lauren B Priddy3

  • 1Department of Mechanical Engineering, Mississippi State University, Mississippi State, MS 39762, United States of America.

Hardwarex
|September 29, 2023
PubMed
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This study presents an affordable, open-source instrumented device for measuring orthopedic screw fixation strength. The benchtop system quantifies torque, load, and speed during screw insertion for research applications.

Area of Science:

  • Biomedical Engineering
  • Orthopedic Research
  • Biomechanics

Background:

  • Quantifying orthopedic screw fixation strength is crucial for implant research.
  • Screw insertion torque is an established method for assessing fixation.
  • Existing methods may lack accessibility or comprehensive data acquisition.

Purpose of the Study:

  • To develop and validate an open-source, cost-effective instrumented benchtop device for measuring screw insertion torque.
  • To enable precise quantification of fixation strength in orthopedic implant research.
  • To provide researchers with a validated tool for analyzing screw insertion parameters.

Main Methods:

  • Construction of an open-source instrumented screw insertion device with a total cost of $7545.
Keywords:
ArduinoMechanical testingOpen source hardwareOrthopedic fixation devicesOsteointegrationScrew insertion

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  • Integration of sensors to record axial load, rotational speed, and applied torque at 10 samples/second.
  • Validation of the device using a bone analog (20 PCF Sawbones©) and specific screw/loading conditions.

    • Main Results:

    • The developed device successfully recorded axial load, rotational speed, and applied torque during screw insertion.
    • Torque sensor resolution was 25% of maximum measured torque, which does not meet ASTM F543-17 standards (10% resolution).
    • The system is optimized for fastener insertion speeds ≤ 120 rpm and axial loads ≤ 50 N.

    Conclusions:

    • An affordable, open-source instrumented device for measuring screw insertion torque has been successfully constructed and validated.
    • The device provides valuable data for orthopedic implant research, though torque sensor resolution may require upgrades for specific standards.
    • This system offers a practical solution for researchers investigating screw fixation strength in various orthopedic applications.