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autoinjector
An autoinjector (or auto-injector) is a medical device designed to deliver a single dose of a particular (typically life-saving) drug.
Most autoinjectors are spring-loaded syringes. By design, autoinjectors are easy to use and are intended for self-administration by patients, or administration by untrained personnel. The site of injection depends on the drug loaded, but it typically is administered into the thigh or the buttocks. The injectors were initially designed to overcome the hesitation associated with self-administration of the needle-based drug delivery device.
== Design ==
The autoinjector keeps the needle tip shielded prior to injection and also has a passive safety mechanism to prevent accidental firing (injection). Injection depth can be adjustable or fixed and a function for needle shield removal may be incorporated. Just by pressing a button, the syringe needle is automatically inserted and the drug is delivered. Once the injection is completed some auto injectors have visual indication to confirm that the full dose has been delivered.
Autoinjectors contain glass syringes, which can make them fragile and contamination can occur. More recently, companies have been looking into making autoinjector syringes out of plastic to prevent this issue.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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