What is a Medical Sensor?
Medical sensor, as the name implies, it is the sensor used in the biomedical field, it picks up the body's physiological information, and its output is often an electrical signal to the performance of medical sensor can be defined as: the human body physiological information conversion apparatus is converted into electrical information determining function therewith. Electrical information and non-electric two categories of human physiological information from the distribution for the body (such as blood pressure, and other types of pressure), there are surface (such as ECG and other types of bio-electricity) and in vitro (such as infrared, biological magnetic medicine, the diagnosis of various diseases need to use a variety of Lead Wires to make the diagnosis and for scientific treatment. Guardianship - continuous determination of whether certain physiological parameters in the normal range, so that timely forecasts of critically ill patients in the ICU ward continuous monitoring of temperature, pulse, blood pressure, respiration and ECG monitor.
Classification of Medical Science Sensors
Chemical sensors use the principles of chemical reaction to convert the chemical composition and concentration into electrical signals; biosensors: selective recognition of biologically active substances to the determination of biochemical substances; physical sensors: the physical change of the material; medical sensors are classified according to the principle broadly can be divided into: Bio-electrode sensor: the body's bio-electrical (ECG, EEG, EMG, neurons discharge, etc.) are needed such sensors, for example, spo2 sensor is one of the most commonly used sensors in medical science.
Basic Requirements of Medical Sensors
Medical sensors as an important branch of the sensor, the design and application must consider the human factors to consider the particularity complexity of biological signals, considering the biocompatibility of biomedical sensors, reliability and security. The sensor itself has a good technical performance, such as sensitivity, linearity, hysteresis, repeatability, frequency response, signal-to-noise ratio, temperature drift, zero drift and sensitivity drift; shape and structure of the sensor with the anatomical structure of the detection site adapted, in use, the measured tissue damage; the impact of the sensor to the object to be measured to be small, no burden physiological activities, does not interfere with the normal physiological function; sensors have sufficient firmness, introduced into DUT parts, not to fall off or be damaged; sensor and the human body must have sufficient electrical insulation, in order to ensure the safety of the human body. Sensor in the human body can adapt to the chemical action of the living body and is compatible with the chemical composition of the in-vivo and difficult to be corroded, and the human body without adverse stimulus, and a non-toxic; sensor into the blood or buried in vivo long-term, and should not cause blood clotting; sensor should be easy to operate, easy to maintain and easy to disinfect in structure.
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