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Research Papers

The Needle With Lancet Point: Geometry for Needle Tip Grinding and Tissue Insertion Force

[+] Author and Article Information
Yancheng Wang

e-mail: yancwang@umich.edu

Bruce L. Tai

e-mail: ljtai@umich.edu

Roland K. Chen

e-mail: krchen@umich.edu

Albert J. Shih

e-mail: shiha@umich.edu
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the Journal of Manufacturing Science and Engineering. Manuscript received June 3, 2012; final manuscript received January 23, 2013; published online May 24, 2013. Assoc. Editor: Suhas Joshi.

J. Manuf. Sci. Eng 135(4), 041010 (May 24, 2013) (7 pages) Paper No: MANU-12-1169; doi: 10.1115/1.4023718 History: Received June 03, 2012; Revised January 23, 2013

The grinding procedure and setup, the cutting edge inclination and rake angles of the needle with lancet point (NLP), and the NLP tissue insertion force are investigated in this paper. The NLP is the most commonly used needle tip geometry. However, there is a lack of research on the NLP grinding and cutting edge characteristics. In this study, a four-step grinding procedure and a mathematical model to calculate the inclination and rake angles along the cutting edge of the NLP are developed. Three cases of NLP are defined based on the relative position of the lancets. Prototype NLP for each case was produced and analyzed. Compared to the regular bias bevel needle, grinding two lancets in NLP can increases the inclination angle, particularly at the needle tip. Experiments with needle insertion into the porcine liver were conducted and results showed that NLP could achieve over 40% reduction of the initial peak needle insertion force compared to that of the regular bias bevel needle tip.

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Figures

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Fig. 1

Needle with lancet point tip: (a) schematic view of key parameters to define the geometry and (b) definition of the inclination angle (λ) and rake angle (α)

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Fig. 2

Four steps in grinding the NLP

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Fig. 3

Grinding setup for the NLP: (a) overall setup and (b) view of the 5C collet and needle tip

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Fig. 4

Needle tip with angles adjustment: (a) secondary bevel angle φ, (b) angle of rotation β, and (c) calculation of q

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Fig. 5

NLP with line DE intersecting the point P (condition 1) in (a) front view and (b) top view with three cases: 1, 2, and 3 with the intersection line DE without touching, intersecting and encompassing the middle line

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Fig. 6

NLP with line DE intersect with X-axis at point Q (condition 2) in (a) front view and (b) top view (ξ = 15 deg, φ = 20 deg, and β = 60 deg)

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Fig. 7

Needles I–IV in this study: three cases of NLP (condition 1) and the regular bias bevel needle

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Fig. 8

The inclination (λ) and rake (α) angles of NLP Needles I, II, and III and the regular bias bevel needle (Needle IV)

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Fig. 9

Experimental setup for needle insertion testing (a) overview, (b) top close-up view, and (c) side close-up view

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Fig. 10

Needle insertion force versus depth for Needle III on porcine liver tissue

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Fig. 11

(a) Side view, (b) front view, and (c) top view of needle tip insertion into tissue

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Fig. 12

Measured initial peak needle insertion force of Needles I−IV

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Fig. 13

Measured initial needle insertion depth of Needles I−IV

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