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Research Papers

Characterization of Plastic Hypodermic Needles

[+] Author and Article Information
Eric Busillo, Jonathan S. Colton

School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405

J. Med. Devices 3(4), 041004 (Nov 20, 2009) (8 pages) doi:10.1115/1.4000452 History: Received November 14, 2008; Revised October 01, 2009; Published November 20, 2009; Online November 20, 2009

A significant potential for plastic hypodermic needles exists as an alternative to current steel needles. This paper presents the design and testing of one type of plastic hypodermic needle. The buckling and penetration characteristics of the needles were modeled and analyzed analytically and by finite element analyses. Experimental penetration tests using plastic and steel control hypodermic needles with skin mimics, specifically polyurethane film and pig skin, were performed to determine penetration and friction forces. Lubricated plastic needles achieved successful penetrations in 25–75% of the tests in both polyurethane film and pig skin with penetration forces ranging from 7 N to 10 N. Penetration tests into butyl rubber stoppers also were conducted with lubricated plastic needles penetrating in 75% of the tests with an average penetration force of 8.3 N. Various lubricants, including silicone oil and a medical grade silicone dispersion, were also studied. In addition, the needles underwent successful perpendicular bending tests and cannula stiffness tests. Finally, fluid flow tests determined fluid flow rates through the needles. Experimental results were compared with each other and to finite element analyses and are discussed.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

38.1 mm LCP needle

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Figure 2

Successful penetration test result

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Figure 3

FEA penetration setup

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Figure 4

Section view of rigid needle penetrating rubber skin mimic at 2.61 s

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Figure 5

Penetration testing Setup

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Figure 6

Perpendicular force test setup

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Figure 7

Stiffness test setup

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Figure 8

Strain in sheet during bending

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