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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.8K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.8K

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Updated: Mar 27, 2026

Fabrication and Implantation of Miniature Dual-element Strain Gages for Measuring In Vivo Gastrointestinal Contractions in Rodents.
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Towards a full-field strain sensor for guiding hernia repairs.

Amy Liao, Hobart W Harris, Michel M Maharbiz

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 7, 2016
    PubMed
    Summary

    A new 3D strain measurement system helps surgeons identify high-stress areas during ventral hernia repair. This technology aims to reduce hernia recurrence by ensuring even stress distribution across surgical mesh implants.

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    Area of Science:

    • Biomedical Engineering
    • Surgical Technology
    • Medical Imaging

    Background:

    • Ventral hernia repairs are common, with 400,000 procedures annually in the US.
    • Surgical mesh is used, but 10-20% of repairs fail, leading to recurrence and complications.
    • High stress concentrations at the tissue-mesh interface may cause hernia recurrence.

    Purpose of the Study:

    • To develop a full-field, 3D strain measurement system for real-time surgical guidance.
    • To enable physicians to identify and address high-strain areas during ventral hernia repair.
    • To decrease the rate of hernia recurrence by optimizing mesh performance.

    Main Methods:

    • Utilized an optical technique: the grid method.
    • Combined with defocused particle image velocimetry (DPIV) for 3D strain measurement.
    • Employed a Canon EOS 7D camera with a pinhole aperture mask.

    Main Results:

    • Developed a system capable of measuring 3D strain distribution across surgical mesh.
    • Achieved a limit of detection down to 0.4% strain.
    • System can measure across a 50 cm range z-axis displacement.

    Conclusions:

    • The developed system provides physicians with active feedback on strain distribution.
    • Real-time strain monitoring can potentially improve surgical outcomes in ventral hernia repair.
    • This technology offers a novel approach to reduce hernia recurrence rates.