Injector pen
An injector pen (also called a medication pen) is a device used for injecting medication under the skin, used either for one injection or for repeated injections. The first injector pen was introduced in 1985 by Novo Nordisk to administer insulin products.[1]
Design
An injector pen consists of a chamber of medication, a tip to attach a needle, and a plunger to inject the dose. Some pens, especially insulin pens, include dials to adjust the dose of the injection before each administration.
Pen needles
All injector pens other than those designed for single use require the use of single-use replaceable pen needles for each injection. These pen needles come in various lengths to accommodate varying depths of subcutaneous tissue under the top of the skin.
References
- ^ Rex, Jørn; Jensen, Klaus H; Lawton, Simon A (2006). "A Review of 20??Years??? Experience with the Novopen?? Family of Insulin Injection Devices". Clinical Drug Investigation. 26 (7): 367–401. doi:10.2165/00044011-200626070-00001.