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Among urolithiasis, urolithiasis is a more extensive and difficult to treat disease. In recent years, with the development of endoscopic equipment and related surgical methods, a new treatment, namely minimally invasive percutaneous nephrolithotomy, appears and is widely used in the treatment of renal calculi. It has been developed for more than 50 years since its appearance. Its advantages are a high stone clearance rate, small surgical trauma, fewer intraoperative and postoperative complications, and a short recovery time for postoperative patients. It is widely used in clinical treatment. The purpose of this paper is to study the potential risk factors of recurrence and the possibility of urinary tract infection in patients with renal calculi after minimally invasive percutaneous nephrolithotomy (MPCNL) with calcified nanoparticles, so as to obtain correct nursing knowledge and reduce recurrence and infection. In order to explore the renal calculi caused by calcified nanoparticles (CNPs), we established a rat model of renal calculi, injected CNPs into rats, collected experimental samples after a specified time, and determined NGAL, OPN and MCP-1 by enzyme-linked immunosorbent assay (ELISA) and compared them with the formation of crystallization. In the study of the possible influencing factors of septic shock after PCNL, we established a multivariate regression analysis and model, used statistical methods and professional statistical software, and used the method of classified data analysis to find out the influencing factors. After the experiment, we found that positive urine culture (P0.05) and preoperative urinary tract infection (P0.05) were significant influencing factors, and the total accuracy was 99.2%. At the same time, it is concluded that calcium nanoparticles can promote the retention, adhesion and aggregation of calcium salt crystals in the kidney, and then lead to the formation of stones.

This paper proposes an analytical approach to directly determine coil thickness dimension only according to the magnetic pole pitch of magnetic levitation planar motors. Based on modeling of the electromagnetic forces/torques of magnetically levitated planar motors, three normalization functions about coil thickness, which are named the main forces/torques impact factor function, the y -axis attaching torque impact factor function, and the ratio factor function of the main forces/torques to coil mass, respectively, are abstracted and derived. These three normalized functions all are dimensionless and single value functions of coil thickness when magnetic pole pitch is specified. Taking the physical meanings of these three functions into account simultaneously and comparing the varying trends of these three functions synchronously, a narrower value range of coil thickness, which is between 0.318 times and 0.525 times of the magnetic pole pitch, is determined. By this approach, the coil thickness of magnetically levitated planar motors with Halbach permanent magnet array can be determined directly, instead of determining by numerical optimization usually including a few optimization parameters. This approach still allows coil thickness dimension to be fine-tuned to meet other design requirements of magnetic levitation planar motors.