Abstract
The performance of hypodermic needlesismainlydependentonquality of theiredges. The quality oftheneedle edges directly impactspenetration forces, tissue healing time, andpatientpain. At present, only subjective techniques are used to access quality of edges of the needles which are not capable to contribute during manufacturing. Thus anappropriatetechnique is desirable to characterize the defects of the needle edges. This study aims to develop a characterization technique for measurement of defects such as roughness, chips and tip bending on the edges of needles. The proposed technique uses the diffraction fringes, obtained from the superposition of diffracted light from needle edges and the direct propagated light from the source. Variations in the fringes and their intensity profiles are utilized to study the defects. Further, the results are compared with results obtained from a standard optical profiler and a microscope. The standard deviation of proposed technique for repeatability and reproducibility of measurements are σ = 0. 104 a.u and σ = 0. 87 a.u, respectively. This technique is simple, non-contact in nature, uses compact configuration and is capable for qualitative and quantitative evaluation of the hypodermic needles.
Published Version
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