Device for protecting an injection apparatus

A device for protecting an injection apparatus for injecting a product, the injection apparatus comprising a reservoir fitted with a needle at its distal end and a piston connected to an actuating rod surmounted by a piston head, the device comprising:

• a support sleeve comprising a body configured to accommodate the injection apparatus and a proximal end part;
• a protective sleeve configured to slide with respect to the support sleeve between a retracted standby configuration in which the needle is exposed and a deployed protective configuration in which the protective sleeve covers the needle;
• first retaining means arranged at the proximal end part of the support sleeve for holding the protective sleeve in a first position;
• second retaining means arranged at the proximal end part of the support sleeve for holding the protective sleeve in a second position, wherein the protective sleeve is appreciably offset in the distal direction with respect to the support sleeve;
• an intermediate collar situated at the proximal end part of the support sleeve, configured to slide with respect to the support sleeve within the proximal end part, the intermediate collar comprising means of collaboration with the piston head of the injection apparatus, and means of deactivating the first and second retaining means,
• the first retaining means configured to be deactivated by the deactivation means of the intermediate collar by pressure of the piston head in the distal direction on the collaboration means of the intermediate collar to cause the protective sleeve to slide in its retracted standby configuration between the first position and the second position;
• and
• the second retaining means configured to be deactivated by the deactivation means of the intermediate collar by release of the pressure of the piston head on the collaboration means of the intermediate collar to allow the protective sleeve to deploy under the action of pushing means.