19 January 2001 Electrostimulation to move endoscopes in the small bowel
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Abstract
Background: Methods are required for propulsion of endoscopes through the small bowel and for propelling capsule endoscopes without cables. Aim: To test the hypothesis that electrical stimulation could propel an endoscope by stimulating muscular contraction. Methods: Prototype acrylic devices of ovoid shape were constructed with two stainless steel electrodes mounted on the tapered section. Five devices of 13 to 23 mm diameter with a taper of 16 degree(s) to 20 degree(s) (half angle) were tested. When in contact with the bowel wall electrostimulation was applied causing circular muscle contraction which when applied to the taper of the ovoid resulted in forward propulsion of the device. The method does not induce peristalsis but works by stimulating local contraction. The device was tested in small bowel and oesophagus of anaesthetized pigs. Results: Electrostimulation caused the ovoid to advance rapidly (6 mm/sec) up and down the oesophagus by inducing circular esophageal muscle contraction. When stimulated at 15 Hz with 30 ms pulses the threshold for movement was 12 mA; at 20 mA the device moved reliably in both directions in the small bowel at speeds of up to 4.5 mm/s, negotiating tight curves.
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Charles A. Mosse, Charles A. Mosse, Timothy N. Mills, Timothy N. Mills, Mark Appleyard, Mark Appleyard, Paul Swain, Paul Swain, } "Electrostimulation to move endoscopes in the small bowel", Proc. SPIE 4158, Biomonitoring and Endoscopy Technologies, (19 January 2001); doi: 10.1117/12.413796; https://doi.org/10.1117/12.413796
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