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Design Innovation Paper

A Novel Tip-Retraction Mechanism for Puncture Devices1

[+] Author and Article Information
Nikolai Begg

Massachusetts Institute of Technology,
Cambridge, MA 02139

This work is an elaboration on two previous technical briefs by the same author: “An Improved Puncture Access Tip-Retraction Mechanism,” June 2013 and “Design and Development of a Novel Puncture Access Device,” March 2012, published in June 2013 and March 2012, in the ASME Journal of Medical Devices as part of the Design of Medical Devices Conference.

Contributed by the Design Innovation and Devices Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received January 22, 2014; final manuscript received June 12, 2014; published online August 6, 2014. Assoc. Editor: Shorya Awtar.

J. Mech. Des 136(10), 105002 (Aug 06, 2014) (10 pages) Paper No: MD-14-1075; doi: 10.1115/1.4027880 History: Received January 22, 2014; Revised June 12, 2014

Puncture access procedures are frequent in medicine but can lead to complications due to over-puncture. When tissue membranes yield under applied stress, the device suddenly accelerates forward into the patient. Factors contributing to greater acceleration and increased risk of over-puncture are identified. A novel flexure-based tip-retraction mechanism is proposed and relevant analysis presented. A preload feature improves functionality and ease of use, and accompanying modified design equations are presented. Prototypes are tested to validate analysis and reliability. The proposed device has the potential to improve safety during puncture access procedures by actively opposing forward acceleration of the device upon break-through thus reducing over-puncture incidents.

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Figures

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Fig. 1

Simple mechanism schematic

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Fig. 2

Tip end of mechanism under load from instrument tip

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Fig. 3

Upper end of mechanism under load from spring

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Fig. 4

Puncture mechanism sequence of use

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Fig. 5

Analytical mechanism schematic

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Fig. 6

Potential flexure design

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Fig. 7

Proposed mechanism embodiment in initial (left) and preloaded (right) states

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Fig. 8

Half of preloaded mechanism with friction-clamp securing feature; relevant forces, and parameters shown

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Fig. 9

Mechanism embodiment with axial compliance element

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Fig. 10

Four consecutive frames from high-speed video of device puncturing tissue, and fifth frame from ten frames later

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