ABSTRACT
Objective To develop a pulling device using magnetic positioning to optimize the procedures of repairment of donor liver from organ donation . Methods The pig liver specimens were used to measure the pull force of repairment of donor liver, magnetic spiderman was developed based on the measurement results. The magnetic spiderman was applied to simulate the repairment of donor liver from organ donation on the pig liver specimens. The effectiveness of magnetic spiderman was also evaluated. Results The pulling force was required all less than 2 N during the repairment of donor liver. The magnetic spiderman was successfully manufactured. The magnets of magnetic spiderman could generate 3 N magnetic forces with paramagnetic basin of hepatic repairment. The self-retraction pull wire of the magnetic spiderman could provide 2.5 N pulling forces. The magnetic spiderman was successfully applied to the simulated experiment of repairment of donor liver from organ donation in 6 cases. The operation time was (54±5) min. No clip slippage,displacement and slippage of the base occurred during the operation. With the cooperation of multiple magnetic spidermen,the remaining surgical procedures were performed by one single surgeon except for the vascular ligation. Conclusions The magnetic spiderman has small volume and implements flexible positioning, can perform pulling operation and nottake up operational space. It can effectively optimize the procedures of repairment of donor liver from organ donation and reduce the quantity of surgeons.
ABSTRACT
Objective To develop a digital signal processing method for magnetic positioning of electronic capsules according to the theory of multiple alternating magnetic field source electromagnetic positioning, so as to reduce the volume and power consumption of electronic capsules. Method Based on STM32 MCU, software algorithms such as fast digital filtering, peak detection and frequency detection were designed to replace the corresponding analog hardware circuits such as analog filtering, peak detection and comparison circuits. Results The experimental results showed that the average relative error of the peak detection and frequency detection of the digital signal processing system were 1.51％ and 0.28％ , respectively. The linear relationships of theoretical amplification factor and actual amplification factor of the programmable amplifier were basically consistent, and the average ratio difference was 4.51 dB. Conclusions The proposed digital signal processing system can replace some analog hardware circuits, providing a basis for reducing the size and power consumption of electronic capsules.