Adapter element for fastening a needle tip to a syringe base body

An adapter element for fastening a needle element and/or a cannula to a syringe base body, comprising:

• a base body configured and provided for receiving the needle element,
• wherein the base body has at least one through-opening for passing the needle element through and for fixing the needle element,
• wherein the base body is configured and provided for being fastened to the syringe base body,
• wherein the base body comprises a hollow body and at least one viewing opening extending through a wall element of the hollow body, in such a way that it is possible to see into an internal volume of the hollow body freely from the outside at least in part,
• wherein the needle element passes through a bottom face of the hollow body, through the internal volume of the hollow body that is viewable through the at least one viewing opening, and through a top face of the hollow body;
• and
• wherein the at least one viewing opening is arranged along an axial direction between the bottom face of the hollow body and the top face of the hollow body.