A portable, hand-held, mechanical device, typically in the form of a large pen, designed to accept a pharmaceutical-containing cartridge (not included) and intended to be used by a patient to subcutaneously inject a dose of the pharmaceutical agent via a replaceable needle. The cartridge is inserted into the device and typically a dial on the device is operated for dosing (e.g., via a spring-loaded mechanism); the cartridge is replaced once the pharmaceutical is exhausted. This is a reusable device.
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