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Related Concept Videos

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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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A device for measuring sternal bone connectivity using vibration analysis techniques.

Atte Joutsen1,2, Juha Hautalahti1,2, Esa Jaatinen3

  • 1Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|December 21, 2019
PubMed
Summary
This summary is machine-generated.

A novel vibration analysis device can detect sternal bone instability after cardiac surgery. This technology shows feasibility in identifying sternotomy gaps, potentially preventing complications and improving patient healing.

Keywords:
Biomechanical testing/analysisbiomedical devicesbone biomechanicsfrequency analysissensors/sensor applications

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Area of Science:

  • Biomedical Engineering
  • Surgical Technology
  • Medical Device Development

Background:

  • Sternal bone splitting sternotomy is critical for healing after open cardiac surgery.
  • Early detection of sternotomy separation (diastasis) is needed to prevent complications.
  • Mechanical vibration transmittance is a potential method for assessing sternal connectivity.

Purpose of the Study:

  • To describe the technical implementation of a vibration analysis prototype device.
  • To validate a device for measuring sternal bone connectivity after sternotomy.
  • To assess the feasibility of using vibration transmittance for detecting sternal diastasis.

Main Methods:

  • An in-house sternal vibration device was designed and manufactured, including an actuator, sensor, and controller.
  • The system was validated using mockups (polylactide rods) and human sternums (intact, stable, and unstable fixation).
  • Vibration transmittance across the median sternotomy was measured in different fixation conditions.

Main Results:

  • Device validation confirmed stable actuator force and precise sensor calibration for acceleration measurement.
  • Vibration transmittance was evident in the 20 Hz to 2 kHz band, detecting material cuts and sternotomy.
  • Transmittance decreased with unstable sternal connectivity, a trend observed across all tested settings.

Conclusions:

  • A feasible vibration analysis device for sternal connectivity assessment was technically implemented and validated.
  • The device successfully differentiated intact bone, stable wire fixation, and unstable fixation with a gap in human sternums.
  • Vibration transmittance analysis shows promise for detecting sternal diastasis, though further accuracy studies are required.