Sheath protecting a cannula, and safety syringe comprising said sheath

An injection system, comprising:

• a protective sheath (100) for a cannula (210), the protective sheath (100) comprising a hollow cylindrical body extending along a longitudinal axis, the protective sheath (100) arranged on a hub (200) which can be fitted onto a syringe, said sheath (100) comprising female features configured to cooperate with a male element (201) of the hub (200) for guiding thereof, wherein:
• said female features are configured to guide the cylindrical body into any one of a retracted before use (RBU) position, and a retracted after use (RAU) position where, in the RAU position, an entire length of the cannula (210) is received inside the cylindrical body,
• said female features are further configured to guide the cylindrical body into an ejection (E) position where at least part of the cannula (210) protrudes outwardly from said the cylindrical body, and
• each of the three RBU, RU, and RAU positions are transversally aligned;
• and
• a hub (200), inserted within said sheath (100).

A syringe system, comprising:

• a syringe;
• and
• a protective sheath (100) for a cannula (210), the protective sheath (100) comprised of a hollow cylindrical body extending along a longitudinal axis, the protective sheath (100) arranged on a hub (200) which is fittable onto the syringe, said sheath (100) comprising female features that cooperates with a male element (201) of the hub (200) for guiding thereof, wherein:
• said female features are configured to guide the cylindrical body into any one of a retracted before use (RBU) position, a retracted during use (RU) position, and a retracted after use (RAU) position where, in the RAU position an entire length of the cannula (210) is received inside the cylindrical body,
• said female features are further configured to guide the cylindrical body into an ejection (E) position where at least part of the cannula (210) protrudes outwardly from of the cylindrical body, and
• each of the three RBU, RU, and RAU positions are transversally aligned.