Research Papers

Compliant Needle Vibration Cutting of Soft Tissue

[+] Author and Article Information
Andrew C. Barnett

Department of Mechanical
and Nuclear Engineering,
The Pennsylvania State University,
319 Leonhard Building,
University Park, PA 16802
e-mail: acbarnett416@gmail.com

Justin A. Jones

Department of Mechanical
and Nuclear Engineering,
The Pennsylvania State University,
319 Leonhard Building,
University Park, PA 16802
e-mail: jjone417@gmail.com

Yuan-Shin Lee

Department of Industrial
and Systems Engineering,
North Carolina State University,
206-A Park Shops,
Raleigh, NC 27695
e-mail: yslee@ncsu.edu

Jason Z. Moore

Department of Mechanical
and Nuclear Engineering,
The Pennsylvania State University,
318 Leonhard Building,
University Park, PA 16802
e-mail: jzm14@psu.edu

1Corresponding author.

Manuscript received December 11, 2015; final manuscript received May 19, 2016; published online June 24, 2016. Assoc. Editor: Y.B. Guo.

J. Manuf. Sci. Eng 138(11), 111011 (Jun 24, 2016) (9 pages) Paper No: MANU-15-1654; doi: 10.1115/1.4033690 History: Received December 11, 2015; Revised May 19, 2016

This work investigates the performance of a novel compliant needle for cutting tissue. The novel cutting geometry transfers axial vibration to transverse motion at the tip. The cutting edge of the geometry is defined in terms of the time-dependent inclination and rake angle. Finite element analysis was performed to determine the compliant geometry effect on the axial vibration modes of the needles. An ultrasonic transducer is used to apply the axial vibration. An ultrasonic horn was developed to increase the amplitude of vibration. Experiments were performed to determine the effectiveness of the compliant needle geometry. The motion of the compliant needle is measured with a stereomicroscope. The two compliant geometries developed transverse motion of 4.5 μm and 16.0 μm. The control needle with fixed geometry developed no measured transverse motion. The insertion force was recorded for two different compliant geometries and a control geometry inserted into a polyurethane sheet. The puncture force of the control needle with applied vibration and the two compliant needles was up to 29.5% lower than the control insertion without applied vibration. The compliant needles reduced the friction force up to 71.0%. The significant reduction of the friction force is explained by the compliant needles' ability to create a larger crack in the material because of their transverse motion.

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Fig. 1

Traditional needle insertion with parallel cutting direction and the novel vibratory compliant insertion with perpendicular cutting force

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Fig. 2

Definition of compliant needle geometry

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Fig. 3

Description of manufacturing process of needle determined by grind angle ξ and rotation angle β

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Fig. 4

Definitions of rake and inclination angles in oblique cutting

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Fig. 5

Edges of needle face

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Fig. 6

Inclination angle of needle tip with variable cutting direction

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Fig. 7

Rake angle of needle geometry

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Fig. 8

The effect of cutting direction θ on inclination angle λ and rake angle α

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Fig. 9

Modal analysis X-direction mass normalized displacement results for (a) control needle, (b) compliant 1, (c) compliant 2, and (d) compliant 3

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Fig. 10

Ultrasonic horn shapes: (a) conical, (b) stepped, and (c) exponential

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Fig. 11

Finite element analysis (a) mesh and (b) modal results

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Fig. 12

Displacement of ultrasonic transducer with and without horn

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Fig. 13

Force measurement setup

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Fig. 14

Image of (a) compliant needle without applied vibration, (b) compliant needle with applied vibration, and (c) control needle with applied vibration

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Fig. 15

Insertion mechanics of control and compliant needles into polyurethane

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Fig. 16

Puncture and friction force results for the needles used in this study

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Fig. 17

Cracks formed by (a) control needle with no vibration, (b) control needle with vibration, (c) compliant needle without vibration, and (d) compliant needle with vibration

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Fig. 18

Cracks lengths caused by needle insertion




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