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Technical Brief

Development of a Distal Tip Extension Mechanism for Endoscopes1

[+] Author and Article Information
Ibrahim F. Kadhim, Rajesh Shanbhag

Department of Mechanical Engineering,
Ohio University,
Athens, OH 45701

JungHun Choi

Department of Mechanical Engineering
and Biomedical Engineering Program,
Ohio University,
Athens, OH 45701

Accepted and presented at the Design of Medical Devices Conference (DMD2014), Minneapolis, MN, April 7–10, 2014. DOI: 10.1115/1.4027074

Manuscript received February 21, 2014; final manuscript received March 3, 2014; published online July 21, 2014. Editor: Arthur G. Erdman.

J. Med. Devices 8(3), 030929 (Jul 21, 2014) (2 pages) Paper No: MED-14-1080; doi: 10.1115/1.4027074 History: Received February 21, 2014; Revised March 03, 2014

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References

Litten, J. D., Choi, J., and Drozek, D., 2011, “Development of an Automatic Adjustable Colonoscope,” ASME J. Med. Dev., 5(4), p. 044502. [CrossRef]
Hsu, C.-M., Lin, W.-P., Su, M.-Y., Chiu, C.-T., Ho, Y.-P., and Chen, P.-C., 2012, “Factors That Influence Cecal Intubation Rate During Colonoscopy in Deeply Sedated Patients,” J. Gastroenterol. Hepatol., 27(1), pp. 76–80. [CrossRef] [PubMed]
Jackson, C. S., Haq, T., and Olafsson, S., 2011, “Push Enteroscopy Has a 96% Cecal Intubation Rate in Colonoscopies That Failed Because of Redundant Colons,” Gastrointest. Endosc., 74(2), pp. 341–346. [CrossRef] [PubMed]
Pilz, J. B., Portmann, S., Peter, S., Beglinger, C., and Degen, L., 2010, “Colon Capsule Endoscopy Compared to Conventional Colonoscopy Under Routine Screening Conditions,” BMC Gastroenterol., 10(June), p. 66. [CrossRef]
Xie, Q., Chen, B., Liu, L., and Gan, H., 2012, “Does the Variable-Stiffness Colonoscope Makes Colonoscopy Easier? A Meta-Analysis of the Efficacy of the Variable Stiffness Colonoscope Compared With the Standard Adult Colonoscope,” BMC Gastroenterol., 12(October), p. 151. [CrossRef]
Chen, P.-J., Shih, Y.-L., Chu, H.-C., Chang, W.-K., Hsieh, T.-Y., and Chao, Y.-C., 2008, “A Prospective Trial of Variable Stiffness Colonoscopes With Different Tip Diameters in Unsedated Patients,” Am. J. Gastroenterol., 103(6), pp. 1365–1371. [CrossRef] [PubMed]
Sadahiro, S., Ohmura, T., Yamada, Y., Saito, T., and Taki, Y., 1992, “Analysis of Length and Surface Area of Each Segment of the Large Intestine According to Age, Sex and Physique,” Surg. Radiol. Anatomy, 14(3), pp. 251–257. [CrossRef]

Figures

Grahic Jump Location
Fig. 4

Plots (a)–(d) are for the straight setup, the mild curve setup, the sharp bend setup, and the alpha loop setup, respectively. Error bars show the max and min number of turns at each distance.

Grahic Jump Location
Fig. 3

Testing the prototype using the colon model in an alpha loop setup. Full extension of the distal tip is shown via a digital caliper.

Grahic Jump Location
Fig. 2

The DTEL consists of three tubes and it is connected to the distal tip and the spring

Grahic Jump Location
Fig. 1

The colonoscope with the components of the DTEM: a telescoping shaft, an extension knob, a spring, and a DTEL

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