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- W2182772033 abstract "Pre-curved needles are used in a variety of medical applications for both passive and active control of instrument position. In one application, the deployment of a pre-curved stylet from a concentric outer cannula can be used to achieve lateral positioning of the distal tip of the stylet. This paper outlines how the material and geometry of the stylet can be chosen to ensure that it will not yield and thus repeatably return to its pre-curved shape when deployed from a cannula. Using this methodlogy we calculate the maximum strain for a range of stylet geometries and show that nitinol is required for the stylet material in order for then to not plastically deform. Then, sixteen stylets of varying diameter (0.508, 0.635, 0.838 and 0.990 mm) and radius of curvature (10, 20, 30 and 40 mm) were manufactured. Experiments were performed with four different diameter cannulas (20, 18, 16 and 14 gauge) to measure the forces required to deploy the stylets from and retract them back inside the cannulas. Retraction forces were measured between 0.3 and 13.9N, and deployment forces were measured between 0.2 and 7.0N. For a given cannula it was found that force increases as stylet diameter increases and bend radius decreases." @default.
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- W2182772033 date "2010-01-01" @default.
- W2182772033 modified "2023-09-27" @default.
- W2182772033 title "MATERIAL SELECTION AND FORCE REQUIREMENTS FOR THE USE OF PRE- CURVED NEEDLES IN DISTAL TIP MANIPULATION MECHANISMS" @default.
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