Patent ID: 7247153

Claim:
A cannula ( 1 ) having a protection cap ( 2 ) for a medical infusion line, said cannula comprising a hollow body ( 3 ) defining at a first end ( 6 ) a female luer lock connector ( 4 - 5 ) adapted to be mated with a male luer lock connector and bearing at a second end an axial tubular ferrule ( 7 ), said hollow body ( 3 ) having an outer surface formed with lateral teeth ( 9 ), and said protection cap ( 2 ) having an inner surface formed with complementary lateral teeth ( 12 ), wherein said protection cap ( 2 ) is configured to be removably applied onto said hollow body ( 3 ) to enclose said tubular ferrule ( 7 ) with said lateral teeth ( 9 , 12 ) of said hollow body ( 3 ) and said cap ( 2 ) is configured to be mutually coupled torsionally for a first direction of rotation corresponding to unscrewing said female leur lock connector ( 4 - 5 ) from said male leur lock connector, and wherein said outer surface of said hollow body ( 3 ) and said inner surface of said protection cap ( 2 ) are both cylindrical and said lateral teeth ( 9 , 12 ) of said hollow body ( 3 ) and cap ( 2 ) have respective included sides configured to torsionally couple said protection cap ( 2 ) and said hollow body ( 3 ) in a second direction of rotation opposite to said first direction until a predetermined torque is reached and providing axial disengagement of said cap ( 2 ) relative to said cannula ( 1 ) when said predetermined torque is reached.