Authors: Xingsheng Wang Peidong Han Min Kang Kornel Ehmann
Publish Date: 2016/03/07
Volume: 122, Issue: 4, Pages: 286-
Abstract
The success of percutaneous procedures depends on the accuracy of the medical needle insertion Reducing the insertion force and using better needle visualization during needle insertion can reduce needle placement errors Surface texturing is frequently used to create microfeatures on medical needle’s tip portion to improve the visibility in ultrasoundguided percutaneous procedures However these microfeatures usually increase the friction between the needle and tissue because of stress concentrations This paper explores a method for creating microfeatures with blended edges on echogenic needles and studies the friction behavior between textured echogenic needles and phantom tissue to identify blended texture patterns that would minimize the friction during needle insertion Laser surface texturing was used to create regular microcircumferential channels and microcornercubelike dimples along the needle’s axial direction Variations of the overlap in the feed direction were used to blend the edges of microchannels and microdimples with different fillet radii Both needles with regular and blended surface textures were experimentally investigated through needle extraction experiments from phantom tissue It was found that the blended textured needles with large fillet radii exhibit a much better friction behaviorThis work was supported by National Science Foundation Grant CMMI0825722 Natural Science Foundation of Jiangsu Province BK20150685 and the Korea Institute of Machinery and Materials X Wang also would like to acknowledge the Chinese Scholarship Council CSC for financial support
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