page_title: Injector pen
section_title: Design
hierarchical_section_title: Injector pen / Design
caption_attribution_description: English: This file was derived from&#58;&#160;&#32;Insulin analog 100 IU-1ml novomix pen yellow background (02).jpg An insulin pen with labels as follows: A) tip; B) medication chamber; C) plunger; D) dose window; E) dose selection dial; F) plunger button
context_page_description: An injector pen is a device used for injecting medication under the skin. First introduced in the 1980s, injector pens are designed to make injectable medication easier and more convenient to use, thus increasing medication adherence. The primary difference between injector pens and traditional vial and syringe administration is the easier use of an injector pen by people with low dexterity, poor vision, or who need portability to administer medicine on time. Injector pens also decrease the fear or adversity towards self-injection of medications, which increases the likelihood that a person takes the medication.
  Injector pens are commonly used for injection medications that are injected repeatedly by a person over a relatively short period of time, especially insulin and insulin analogs used in the treatment of diabetes. Many other medications are also available as injector pens, including other injectable medicines for diabetes, high cholesterol, migraine prevention, and other monoclonal antibodies.
context_section_description: An injector pen consists of a chamber or cartridge of medication, a tip to attach a needle, and a piston or plunger to inject the dose. Some pens, including most insulin pens, include dials to adjust the dose of the injection before each administration. Dials enable more accurate dose measuring than traditional vial and syringe administration, especially for low doses of insulin. Injector pens which have dials to adjust dosages may also include a clicking sound or other method to confirm the dose adjustment.
  Some pens may include a cartridge filled with medication which can be replaced when empty to enable reuse of the pen itself, whereas other pens are designed to be disposed of after their prefilled chamber is depleted. Injector pens designed for single use may also be autoinjectors, which do not require the user to press a plunger to inject the dose.
caption: An insulin pen with labels as follows: A) tip; B) medication chamber; C) plunger; D) dose window; E) dose selection dial; F) plunger button
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