Cannula and infusion devices

An infusion device for subcutaneous delivery of a therapeutic agent to a patient comprising:

• a cannula comprising a tubular body member comprising a tubular wall at least partly enclosing a longitudinally-extending internal bore, a distal portion of the tubular body member having a distal tip end comprising at least one tip opening, wherein the tubular wall comprises at least two weakened portions in the tubular wall oriented in a longitudinal direction parallel with the longitudinally-extending internal bore, the at least two weakened portions being capable of allowing the cannula to flex outwards away from the longitudinally-extending internal bore in an area comprising the at least two weakened portions when the cannula is exposed to a compression force or an increased internal pressure;
• and
• a hub part configured to be fastened onto the patient's skin via a mounting pad,
• wherein each of the at least two weakened portions is formed as a slit located at a same circumferential location of the tubular body member, wherein the slits comprise a particular slit and a corresponding slit, wherein the width of the particular slit is greater than the width of the corresponding slit located about 180 degrees opposite from the particular slit.