This article presents a novel design of integrated human vital signs simulator, whose function includes the simulation of blood oxygen, blood pressure and ECG. According to the light transmission model basing on the optical properties of biological tissues, the pulse oximetry simulation module is designed, including its overall structure, a analog finger, a light source driving circuit, etc. The non-invasive blood pressure simulation module is designed basing on oscillographic method, and a piston rod type variable air chamber pulse waveform generation mechanism is included, using PWM constant current control and ultra small subdivision technology to control the linear motor to achieve stable and accurate displacement, and the pulse wave is simulated according to the blood pressure envelope. ECG verification waveform is generated by STM32F407 chip basing on ARM. The experimental verification results show that the designed simulator can meet the requirements of JJF 1470-2014 Calibration Specification for Multiparameter Physiological Simulators, and can complete the measurements efficiently and accurately.
KEYWORDS: Endoscopes, Calibration, CCD cameras, Image processing, Medical devices, Control systems, Design and modelling, Data transmission, Portability, Cameras
Medical endoscopes enter the human body cavity through physiological or surgical openings to observe the pathological changes of the tissue structures inside the cavity, helping doctors diagnose diseases. Medical endoscopes are also auxiliary medical devices used in minimally invasive surgical techniques. They are widely used in clinical practice, and their metrological performance directly affects the diagnosis and treatment of diseases by doctors. They are classified as Class II moderately risky medical devices and Class III higher risk medical devices in the "Medical Device Classification Catalog." Strict control and management or special measures must be taken to ensure their safety and effectiveness. Based on this, this article designs a portable and field-calibrated medical endoscope calibration device. Through this calibration device, the metrological performance of the medical endoscope can be objectively evaluated to ensure the accuracy and reliability of the medical endoscope's measurements, and achieve effective traceability.
Ophthalmic ultrasonic B-mode diagnostic device is widely used in medical institutions. “penetration depth”, “resolution”, “dead zone” and “geometric position accuracy” are the key technical parameters to evaluate the metrological performance of the device. However, until now no national or local metrological specifications applicable to ophthalmic ultrasonic B-mode diagnostic device has been issued in China, and the corresponding traceability system of the device has not been established either. The novel calibration procedure presented in this article has been performed on several typical types of ophthalmic ultrasonic B-mode diagnostic devices widely used in China, and the experimental results show that the calibration method presented in this article can be adopted for the periodic calibration of ophthalmic ultrasonic B-mode diagnostic device, in order to establish the metrological traceability system of the device.
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