The critical role of video frame rate in digital microscope-based stent inspection

Optical inspection of stents is a high-stakes, multi-faceted process that relies on non-contact imaging to catch microscopic burrs, sharp edges, surface flaws, verifying drug coatings, and measuring vital strut dimensions in these life-saving medical devices. Because a single defective stent can have severe consequences, these inspections are conducted at various stages of production and often involve a mix of manual and automated techniques.

Dedicated Stent Inspection Workstations with advanced Digital Microscopes are replacing traditional stereo microscopes for manual or semi-automated inspection and quality control of stents. While modern 4K digital microscopes offer high resolution images and excellent ergonomic benefits for operators , they present distinct optical and operational challenges compared to stereo microscopes.

Despite their clear advantages, optical inspection of stents with digital microscopes can be challenging due to a combination of the complex physical properties of the stent and the inherent limitations of digital imaging technology. The biggest challenges include achieving a clear real-time view of the cylindrical 3D surfaces without glare or blur related to the system’s digital 2D images and video frame rate.

In this article, we discuss the impact of frame rate (FPS) on video image quality, a critical parameter that directly affects operator efficiency, accuracy, and fatigue during real-time inspection and quality control of stents.

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