Patent ID: 8043249

Claim:
A fixing device for injection needles, for pushing onto an injection apparatus comprising a threaded segment having a plurality of threads having a pitch, wherein said fixing device is formed as a cap comprising an open lower end and a closed upper end which holds a needle perpendicularly in the middle, and a surface area of the fixing device comprises at least three spring elements fixedly connected to the cap so that the fixing device is at least slightly spring-elastic in its circumference, the spring elements each comprising a bending beam and a notched cam, each bending beam comprising a spring-elastic beam with a first end joined to the upper end of the cap and a second end joined to the lower end of the cap, and each notched cam comprising a surface substantially parallel to the surface area and tips and being fixed to a center-point of the bending beam, wherein when said fixing device is positioned on the threaded segment of the injection apparatus, the bending beams of the at least three spring elements elastically deform such that the notched cams are directed to said threaded segment and at least one of the tips of at least two of said notched cams perpendicularly engage with and provide at least three points of contact with the threaded segment.