Hollow needles are one of the most common medical devices, yet little study has focused on the needle tip cutting geometry for biopsy, which is a tissue cutting process. This research develops mathematical models to calculate the inclination and rake angles along cutting edges on needle tips generated by planes. Three types of plane needle tips, the one-plane bias bevel, multi-plane symmetrical, and two-plane nonsymmetric needles, are investigated. The models show that the leading tip of a bias bevel needle has an inclination angle of 0 deg, the worst configuration for cutting. Symmetric multiplane needles on the other hand have very high inclination angles, 60, 56.3, and 50.8 deg, given a needle formed by two-, three-, and four-plane, respectively, for a bevel angle of 30 deg and can assist more effective needle biopsy. The rake angle is at its greatest value (the best configuration for cutting), which equals the 90 deg minus the bevel angle, at the initial cutting point for the bias bevel needle. Experiments are performed using three 11 gauge two-plane symmetric needles with 20, 25, and 30 deg bevel angles on bovine liver and demonstrate that the needle tip geometry affects biopsy performance, where longer biopsy samples are collected with needles of higher rake and inclination angle.
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October 2010
Research Papers
Modeling of the Plane Needle Cutting Edge Rake and Inclination Angles for Biopsy
Jason Z. Moore,
Jason Z. Moore
Department of Mechanical Engineering,
University of Michigan
, Ann Arbor, MI 48109
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Qinhe Zhang,
Qinhe Zhang
Department of Mechanical Engineering,
Shandong University
, Jinan, Shandong 250100, China
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Carl S. McGill,
Carl S. McGill
Department of Biomedical Engineering,
University of Michigan
, Ann Arbor, MI 48109
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Haojun Zheng,
Haojun Zheng
Department of Precision Instrument and Mechanology,
Tsinghua University
, Beijing 100084, China
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Patrick W. McLaughlin,
Patrick W. McLaughlin
Department of Radiation Oncology,
University of Michigan
, Ann Arbor, MI 48109
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Albert J. Shih
Albert J. Shih
Department of Mechanical Engineering, and Department of Biomedical Engineering,
University of Michigan
, Ann Arbor, MI 48109
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Jason Z. Moore
Department of Mechanical Engineering,
University of Michigan
, Ann Arbor, MI 48109
Qinhe Zhang
Department of Mechanical Engineering,
Shandong University
, Jinan, Shandong 250100, China
Carl S. McGill
Department of Biomedical Engineering,
University of Michigan
, Ann Arbor, MI 48109
Haojun Zheng
Department of Precision Instrument and Mechanology,
Tsinghua University
, Beijing 100084, China
Patrick W. McLaughlin
Department of Radiation Oncology,
University of Michigan
, Ann Arbor, MI 48109
Albert J. Shih
Department of Mechanical Engineering, and Department of Biomedical Engineering,
University of Michigan
, Ann Arbor, MI 48109J. Manuf. Sci. Eng. Oct 2010, 132(5): 051005 (8 pages)
Published Online: September 20, 2010
Article history
Received:
August 18, 2009
Revised:
July 2, 2010
Online:
September 20, 2010
Published:
September 20, 2010
Citation
Moore, J. Z., Zhang, Q., McGill, C. S., Zheng, H., McLaughlin, P. W., and Shih, A. J. (September 20, 2010). "Modeling of the Plane Needle Cutting Edge Rake and Inclination Angles for Biopsy." ASME. J. Manuf. Sci. Eng. October 2010; 132(5): 051005. https://doi.org/10.1115/1.4002190
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