In this paper, the authors propose a new magnetic control method for spiral-type wireless capsule endoscope (WCE). A cylindrical external permanent magnet (EPM) is used to generate rotational magnetic field to manipulate the synchronous rotation of a magnetic spiral-type WCE. To verify the feasibility of this method, a handheld actuator (HA) controlled by micro controller unit (MCU) was fabricated to drive the rotation of the EPM which is fixed on a step motor, and a magnetic spiral-type WCE along with a bracket were fabricated, too. Theoretical analysis and magnetic simulation about the control distance were performed. In ex vivo experiments were carried out in porcine small intestine, the control distance and control performances were evaluated. Experimental results indicate that this method can provide a maximum control distance up to 426.6[Formula: see text]mm with good control stability. Compared with Helmholtz coils method, this method is more cost-effective and the control region is broader. In addition, the estimated value of static friction torque (about 0.5694[Formula: see text]mN[Formula: see text][Formula: see text][Formula: see text]m) is obtained, which enriches the current research on friction issue in active control of the magnetic spiral-type WCE. This method has great potential to be applied in future clinical application.
In this paper, a novel plate lattice-filled square honeycomb (PLSH) is proposed in an attempt to improve the quasi-static compression performance and energy absorption of structure. Firstly, the quasi-static compression performance of the 3D-printed PLSH was analyzed through experimental investigation and finite element analysis. The results showed that the compressive strength and energy absorption capacity of the proposed PLSHs are higher than the sum of those of square honeycomb (SH) and plate lattices (PLs) which were tested individually. It can be seen that compressive strength per unit mass [Formula: see text] and energy absorption per unit mass [Formula: see text] by 15%–45% and 51%–151% relative to the SH, respectively, and 65.2%–582% and 78%–196% relative to the PLs, respectively. The strengthening mechanism is that the mutual constraint between the SH and PL stabilizes the buckling and alters the compressive deformation mode of both constituents, resulting in elevating compression performance and energy absorption capability of the PLSH.
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