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Characterization and Experimental Results of a Novel Sensor for Measuring the Contact Force From Myenteric Contractions

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3 Author(s)
Terry, B.S. ; Univ. of Colorado, Boulder, CO, USA ; Schoen, J.A. ; Rentschler, M.E.

The intraluminal pressures and traction forces associated with the migrating motor complex are well understood; however, the contact forces directly exerted by the bowel wall on a solid, or near solid, bolus have not previously been measured. Quantifying contact forces is an important component to understanding the net force experienced by an in vivo robotic capsule endoscope. In this paper, we develop a novel sensor, the migrating motor complex force sensor (MFS), for measuring the contact force generated by the contracting myenteron of the small intestine. The MFS consists of a perfused manometer connected to four torus-shaped balloons custom formed of natural latex rubber and embedded with temperature and pressure sensors. Force exerted on the balloon causes sensor pressure change. In vivo, the MFS measures the magnitude and axial location of contact pressure exerted by the myenteron. The device is tested in vivo in a live porcine model on the middle small bowel. The mean total force per centimeter of axial length of intestine that occurred over a 16-min interval in vivo was 1.04 N·cm-1 in the middle region of the small intestine; the measured force is in the range of theoretical values.

Published in:

Biomedical Engineering, IEEE Transactions on  (Volume:59 ,  Issue: 7 )

Date of Publication:

July 2012

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