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Novel needle cutting edge geometry for end-cut biopsy
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10.1118/1.3665253
/content/aapm/journal/medphys/39/1/10.1118/1.3665253
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/1/10.1118/1.3665253
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

End-cut needle biopsy procedure of capturing tissue.

Image of FIG. 2.
FIG. 2.

Definitions of inclination angle (λ) and rake angle (α) on a two-plane symmetric needle tip.

Image of FIG. 3.
FIG. 3.

Regular two-plane symmetric needle defined by the bevel angle ξ.

Image of FIG. 4.
FIG. 4.

Inclination (λ) and rake angle (α) of regular two-plane symmetric needle and ECE two-plane needle.

Image of FIG. 5.
FIG. 5.

(a) ECE two-plane needle with a continuous cutting edge and (b) ECE two-plane needle with a discontinuous cutting edge.

Image of FIG. 6.
FIG. 6.

ECE two-plane needle in (a) isometric view (b) side view, and (c) top view.

Image of FIG. 7.
FIG. 7.

(a) Side view and (b) top view of needle tip exposed to initial tissue cutting.

Image of FIG. 8.
FIG. 8.

Experimental setup for needle insertion into bovine liver.

Image of FIG. 9.
FIG. 9.

Regular two-plane symmetric and ECE needles used for experiments.

Image of FIG. 10.
FIG. 10.

Needle insertion into bovine liver force example of ECE needle with ξ = 20°.

Image of FIG. 11.
FIG. 11.

Biopsy sample length comparing ECE two-plane needles to regular two-plane needles.

Image of FIG. 12.
FIG. 12.

Biopsy sample length comparing pressure effect for (a) regular and (b) ECE two-plane needles.

Image of FIG. 13.
FIG. 13.

Internal wall friction force repels the motion of the incoming tissue while the vacuum force helps to pull the sample into the needle.

Image of FIG. 14.
FIG. 14.

Needle insertion force comparing ECE two-plane needles to regular two-plane needles.

Image of FIG. 15.
FIG. 15.

Needle insertion force comparing pressure effect for (a) regular and (b) ECE two-plane needles.

Image of FIG. 16.
FIG. 16.

Force model prediction with given S factors for regular two-plane and ECE needles.

Image of FIG. 17.
FIG. 17.

The effect of needle vacuum pressure on S factor.

Image of FIG. 18.
FIG. 18.

Needle insertion force compared to biopsy length with least squares best fit lines for needle pressures of (a) 0 kPa, (b) −33.9 kPa, and (c) −67.7 kPa.

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/content/aapm/journal/medphys/39/1/10.1118/1.3665253
2011-12-12
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Novel needle cutting edge geometry for end-cut biopsy
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/1/10.1118/1.3665253
10.1118/1.3665253
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