Micro solenoids are small electronically controlled valves used in medical devices, laboratory equipment, and aerospace research. They can control small amounts of fluids and have excellent reaction time and durability. They are useful for delivering drug therapy, automating test systems, and controlling fluid flows.
A micro solenoid is an electronically controlled valve that is very small or can control very small amounts of fluid. Valves that have been miniaturized to microscale sizes are useful in medical devices. On a slightly larger scale, small solenoid valves can be designed to control extremely small amounts of fluids. These valves are useful in medical dispensing or laboratory analytical equipment that requires micro-quantities of medicines or reagents.
Miniature solenoids were developed in the late 20th century to support growing interest in implantable or portable delivery equipment. Patients undergoing chemical treatment often require the continuous administration of low-quantity drugs. This treatment can be continued outside a hospital or medical facility to promote well-being. A micro-solenoid delivery system connects control valves to a microprocessor to deliver drug therapy at a prescribed rate. Batteries can run the system because the micro solenoid requires very little energy.
Controlling small quantities of fluids is used for in-room medical supply equipment, air control systems, and pilot plant operations for small-scale manufacturing. An in-room delivery system can deliver small amounts of medication similar to a portable system, with a power cord providing electricity. Air control by micro solenoids has been used in mobile or articulated artificial limbs. Similar compressed air valves can be used for the delivery of chemicals to pilot plant operations.
Another common use of a micro solenoid is in laboratory analytical equipment. Liquid and gas chromatography and other devices use very small amounts of reagents and fluids to test. Early versions of these machines required technicians to manually add these materials as needed. Interest in automation has led to machines programmed to add chemicals using solenoid valves. These automated test systems are reliable and deliver reliable and reproducible test results.
This technology can be used to turn fluid flows on or off and to control them. Some medical devices require quick start and stop controls, perhaps for drug administration, to control a micropump, or to act as an emergency stop. A micro solenoid exhibits excellent reaction time at high speeds and can be used as a pinch valve for plastic pipes or as a stop valve for gases or liquids.
Aerospace research is another area where micro solenoids are used. Pulse engines provide thrust to missiles and rockets by delivering fuel in a rapid series of pulses, creating a repeating detonation. Micro solenoids have been shown to operate at frequencies of over 100 cycles per second or higher required by pulse motors. Tests have also shown that the micro solenoids last for millions of opening and closing cycles, which provides excellent durability and reliability.
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