Release date: 2014-12-17 Wearable health sensors have already been available, and an absorbable Proteus sensor has been born (has passed the FDA (US Food and Drug Administration) review), and sensors are often used in medical electronics. This article focuses on the basic applications of biosensors, load cells, and non-contact temperature sensors in the medical electronics field. Pressure sensor A load cell sensor is a transducer that converts force or gravity into an electrical signal. Pressure sensor applications, commonly referred to in medical applications, are medical pressure sensors, which must be highly accurate and compact for easy portability, especially when the device is directly connected to the patient. If the sensor is used in a medical device-integrated monitoring instrument, standard packaging materials such as stainless steel and anodized aluminum are used. If the device is in direct contact with the human body or liquid, special stainless steel or disposable sensors that can be autoclaved can be used. The figure below shows the medical application of the pressure sensor. Medical pressure sensors have been used for bed weight monitoring in the early days, and now small pressure sensors are used in areas where human error is likely to occur, such as infusion pumps for administration. In order to adjust the flow rate as accurately as possible and to facilitate the nurse to monitor at any time, the pressure sensor is applied to the infusion pump. This sensor accurately measures the weight of the infusion bag. When the weight of the liquid is different from the preset value, the sensor will immediately send a warning message to the connected device and communicate with the controller in time. Non-contact temperature sensor In general, non-contact thermometers measure the heat emitted from a remote infrared radiant heat source. The non-contact surface is clearly visible without a clear fiber optic temperature sensor or a combination of infrared fiber and infrared sensors. This may help determine the surface temperature of fast moving objects, even in narrow places and electromagnetic fields. AgClxBr1-X is considered to be the best choice for measurement at low temperatures. These fibers are characterized by flexibility, insolubility and non-toxicity. For this reason, silver halide infrared optical fibers are used in infrared spectroscopy, as well as in radiation measurement and thermal imaging in industrial and medical applications. biological sensor Biosensors are sensitive to biological substances and convert their concentrations into electrical signals for detection. They are identified by immobilized bio-sensitive materials (including enzymes, antibodies, antigens, microorganisms, cells, tissues, nucleic acids and other biologically active substances). Analytical tools consisting of appropriate physical and chemical transducers (such as oxygen electrodes, phototubes, field effect transistors, piezoelectric crystals, etc.) and signal amplification devices. In clinical medicine, enzyme electrode is one of the earliest developed and most widely used sensors. Microbial sensors can be made by using microorganisms with different biological properties in place of enzymes. Biosensors have been used to monitor a variety of bacteria, viruses and their toxins. A typical representative product of biosensors for drug analysis is the SPR biosensor, which is a surface membrane resonance analysis, which is a technique for determining biomolecule binding in real time. Implantable sensor Implantable sensors are small, lightweight, and compatible with the body, while still requiring very little power. More importantly, they cannot decay over time. The power requirement is one of the main challenges faced by implantable sensors in their normal operation. Sensors that do not require power are perfect, but there are no such sensors on the market. Piezoelectric polymerization sensors are small in size, highly reliable, require no external power and can last for a long time. This type of sensor can be used to monitor cardiac pacemakers for patient activity. As shown in the figure below, heart rate changes can be monitored in real time through implantable sensors. For example, because of a large aneurysm in the abdomen, it is required to remove a portion of the fragile artery and replace it with a synthetic tubular organ. At this time, a sensor can be implanted during the operation to monitor the pressure leak at the surgical site. Other uses of sensors in medicine Today, sensors are commonly used in a variety of monitoring instruments. The monitor is used in the medical environment (such as operating rooms, emergency rooms, intensive care units, intensive care units, and increasingly common patient families) to monitor and display various major conditions of the patient's body, including electrocardiogram, pulse oximetry, and blood pressure. , breathing and temperature, etc. The monitor can be a stand-alone instrument or a multi-parameter instrument. The role of the oxygen generator is to reduce the amount of nitrogen delivered to the patient's air while increasing the proportion of oxygen. Oxygen generators are used in patients who cannot breathe oxygen smoothly into the blood, such as some patients with lung disease. Since the airflow sensor used in the oxygen generator must be able to measure ultra-low flow, if it is necessary to measure a flow rate of 0.1 cubic centimeter, the airflow sensor can be used to detect when the patient begins to exhale (ie when the air flow should be reduced), so that the patient Breathing is easy and comfortable. Low-pressure and ultra-low-pressure plastic-sealed silicon pressure sensors detect when a patient starts inhaling in order to deliver oxygen efficiently and efficiently, which not only reduces system reaction time, but also avoids oxygen supply when the patient does not inhale. waste. Therefore, the operation efficiency of the oxygen generator can be improved without requiring a bulky oxygen generator. The small volume oxygen generator, which consumes less power and is easy to carry, is a stainless steel medium-isolated pressure sensor that detects the pressure of the buffer tank and feeds back signals to the compressor to maintain a moderate pressure. 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