What are the routes of administration for insulin?

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For patients with type 1 diabetes, a prefilled insulin cartridge can also be inserted into a personal insulin pump.
This device is permanently worn by the patient and constantly delivers an infusion of insulin, at a rate defined by the user.
The cartridge is changed every few days.
In the United Kingdom, only people with type 1 diabetes who meet essential criteria are entitled to a trial of insulin pump therapy.