Common Walking Fault of Multileaf Collimator in Linear Accelerator / 中国医疗器械杂志

This paper introduces the failure phenomenon, failure analysis, maintenance process and method of SIEMENS PRIMUS linear accelerator.

Operating Principle and Fault Analysis for Electrocardiographic Magneto Potentiometer / 医疗卫生装备

The inner structure and operating principle of non-contact magneto potentiometer are described. The noncontact magneto potentiometer is one of the main parts of the electrocardiographic magnetic sensing position feedback recorder, which is important for the electrocardiograph to operate normally. If magneto potentiometer has any problem, it will result in some faults. Based on the analysis about the common faults, static method and dynamic method are provided. At last, some suggestions and reference are presented for detection and maintenance.

Study on programmable gain in ultrasonic guidance system for the blind / 医疗卫生装备

Ultrasonic sensors are optimal to the guidance system for the blind.The previous ultrasonic guidance systems acquire the position information of obstacles,and transform it into audio signal or tactile vibration.The system developed in this paper,utilizing programmable gain technique and digital potentiometer,acquires the power of reflected ultrasonic as additional information,and informs the blind with modulated audio signal.In this paper,the studies on programmable gain is described detailed including the hardware structure,the software design and information post processing.