Abstract
In this paper, a novel method of controlling the wireless capsule endoscope (WCE) is proposed. The WCE is coated with a magnetic shell wounded by a spiral structure. The external permanent magnet (EPM) provides coaxial control to the magnetic spiral-type WCE. According to this control method, the maximum and minimum control distances between the EPM and WCE are theoretically analyzed and simulated by electromagnetic software, and the corresponding measured values are 276.3 mm, 87.1 mm, respectively. In experiments, the WCE's stable translational velocity can reach 32.9 mm/s. It indicates that this method is of good control performances and has great potential to be used in the future real clinical applications.
Highlights
In the examining gastrointestinal (GI) diseases most hospitals use fiber-endoscope and endoscope camera, which need be manually inserted from patient’s oral cavity or anus into stomach or intestines
1) EXPERIMENTS ON DIRECT MEASUREMENTS FOR dmax external permanent magnet (EPM) was coaxial with the wireless capsule endoscope (WCE), and they have to be kept in a suitable distance which is larger than the minimum control distance dmin to avoid collision
The thin line was dragged by the force sensor at a constant speed to make the WCE rotate, at this point, the radial frictional force that the inner wall of the porcine small intestine exerted on the WCE is equal to the tensile force of thin line obtained by the force sensor
Summary
In the examining gastrointestinal (GI) diseases most hospitals use fiber-endoscope and endoscope camera, which need be manually inserted from patient’s oral cavity or anus into stomach or intestines. In our previous study [22], a magnetostatic drive method for magnetic spiral-type WCE has been proposed. In order to enlarge the control distance, the authors proposed a new magnetic control method for magnetic spiral-type WCE, in which EPM provides coaxial control to the WCE. B. Ye et al.: Research on Coaxial Control of Magnetic Spiral-Type Capsule Endoscope. Horizontal thrust fpush is generated by the synchronous rotation between EPM and the WCE, and it drives the translation of the WCE in the intestine. Fin an fout drefer to the horizontal components of friction from the inside and outside of spiral structure when the WCE is rotated by EPM, for the WCE interacts with the intestine wall and mucus in it. Once the rotational direction of EPM is changed the WCE’s rotational direction will change the same
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