Component for a drug delivery device and drug delivery device

A component for a drug delivery device, the component configured to be connected to an arrangement of the drug delivery device and comprising:

• at least one functional element;
• wherein at least when the component is connected to the arrangement, a transition region is formed between facing surfaces of elements of the drug delivery device, at least one of these elements being an element of the component;
• wherein the transition region reaches from an exterior of the component to an interior of the component, and
• wherein the transition region is designed such that a risk of fluid reaching from the exterior into the interior of the component via the transition region is reduced in order to protect the functional element.

A drug delivery device comprising:

• an arrangement comprising a container holder for holding a drug container;
• and
• a component configured to be connected to the arrangement and comprising:
• at least one functional element;
• wherein at least when the component is connected to the arrangement, a transition region is formed between facing surfaces of elements of the drug delivery device, at least one of these elements being an element of the component;
• wherein the transition region reaches from an exterior of the component to an interior of the component;
• and
• wherein the transition region is designed such that a risk of fluid reaching from the exterior into the interior of the component via the transition region is reduced in order to protect the functional element.

A method of delivering a drug from a drug delivery device, the method comprising:

• operating a drug delivery device, the drug delivery device comprising:
• an arrangement comprising a container holder for holding a drug container;
• and
• a component configured to be connected to the arrangement and comprising:
• at least one functional element;
• wherein at least when the component is connected to the arrangement, a transition region is formed between facing surfaces of elements of the drug delivery device, at least one of these elements being an element of the component;
• wherein the transition region reaches from an exterior of the component to an interior of the component, and
• wherein the transition region is designed such that a risk of fluid reaching from the exterior into the interior of the component via the transition region is reduced in order to protect the functional element.