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. 2016 Aug 16;20(3):475–480. doi: 10.1007/s10120-016-0630-4

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — a The drill has three main characteristics: a sharp tip (I), front-like cutter (II) and deep helical ditch (III). b The diameter of the drill is 2 mm, and the helical ditch is 30 mm. The drill is inserted in a 7-Fr sheath for catheter angiography