Device for protecting an injection apparatus, in particular an injection apparatus for medical use, such as a syringe

2- Device (1) according to claim 1, characterized in that the leg (7) and the device (1) each comprise an additional bearing surface (7b, 11b) arranged substantially transversely relative to the axis of the sleeve (3), the two bearing surfaces (7b, 11b) constraining the leg (7) along the longitudinal direction of said leg (7) when they bear against each other.

3- Device (1) according to claim 1, characterized in that the leg (7) and the device (1) each comprise an additional bearing surface (7c, 11c) arranged substantially longitudinally relative to the axis of the sleeve (3), the two bearing surfaces (7c, 11c) constraining the leg (7) along the circumferential direction of said leg (7) when they bear against each other.

4- Device (1) according to claim 1, characterized in that the leg (7) comprises two additional bearing surfaces (7b, 7c), a first of which is arranged so as to constrain the leg (7) along the longitudinal direction of said leg (7) and the second of which is arranged so as to constrain the leg (7) in the circumferential direction, the device (1) comprising two corresponding additional bearing surfaces (11b, 11c).

5- Device (1) according to claim 1, characterized in that said additional bearing surfaces (7b, 7c;

• 11b, 11c, 10c) of the leg (7) and the device (1) are arranged in a location located substantially between one-third and two-thirds of the length of the leg (7).

6- Device (1) according to claim 4, characterized in that:

• the leg (7) has an enlarged upper portion, forming an extension in the circumferential direction, this extension having a lower edge (7b) which forms said first additional bearing surface and an end edge in the circumferential direction (7c), which forms said second additional bearing surface, and
• the sleeve (3) comprises at least one proximal wall located in the vicinity of the leg (7), presenting a notch (11) forming a first rim (11b), extending substantially in the transverse direction relative to the axis of sliding of the sleeve (3), able to cooperate with said first additional bearing surface of the leg (7), and a second rim (11c), extending substantially in the longitudinal direction relative to the axis of sliding of the sleeve (3), able to cooperate with said second additional bearing surface of the leg (7).

7- Device (1) according to claim 1, characterized in that:

• the leg (7) comprises a tilted edge (7d) extending over its entire length, forming one said additional bearing surface comprised by said leg (7), and
• the device comprises at least one wall (10) having a tilted rectilinear edge (10c) also extending over the entire length of this wall, forming one said additional bearing surface of the device (1).

8- Device (1) according to claim 1, characterized in that the leg (7) comprises an area (12) having a reduced cross-section, located away from said additional bearing surfaces.