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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...

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Updated: Oct 8, 2025

Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation

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Published on: January 27, 2023

Three-Axis Tension-Measuring Vitreoretinal Forceps Using Strain Sensor for Corneal Surgery.

Seongjin Yang¹, Suhyeon Kim¹, Seong Kyung Hong¹

¹Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang 790-784, Korea.

|December 28, 2021

Summary

This study introduces a novel tension-measurement system for corneal surgery forceps, enhancing precision. The system accurately measures suture tension, even at failure, improving surgical outcomes.

Keywords:

MEMS flexible sensor healthcare monitoring stretchable electronics

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Last Updated: Oct 8, 2025

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Area of Science:

Ophthalmology
Robotic Surgery
Biomedical Engineering

Background:

Precise motion control is critical in robotic corneal surgery.
Existing systems may lack adequate sensitivity for delicate corneal suturing.

Purpose of the Study:

To develop and validate a novel tension-measurement system for corneal surgery forceps.
To enhance surgical precision and safety during corneal procedures.

Main Methods:

Integration of a customized nano-crack sensor with forceps for precise force detection.
Development of a printed circuit board for simultaneous multi-sensor data collection and visualization.
Validation through pig-corneal suturing experiments.

Main Results:

The system accurately measures suture tension, even at suture failure.
Customized sensor sensitivity matches the strain rate of the forceps tip.
Visualization of tension direction and magnitude provides real-time surgeon feedback.

Conclusions:

The developed tension-measurement system significantly improves precision in robotic corneal surgery.
This technology offers potential for enhanced safety and efficacy in ophthalmic procedures.
Real-time tension feedback empowers surgeons with critical data for optimal control.