Syringe, syringe body and method for the production thereof

A syringe body for a syringe, comprising:

• a syringe main body having a longitudinal axis, a side wall, a front wall, and a nozzle arranged on the front wall,
• a front wall of the syringe body having a two-layer region with an internal wall and an external wall,
• the internal wall defined by the front wall of the syringe main body and having opposite distal front and proximal rear surfaces, the proximal rear surface of the internal wall and the side wall forming an internal volume,
• the external wall having opposite distal front and proximal rear surfaces, the distal front surface of the internal wall directly adjoining the proximal rear surface of the external wall to form a two-layer sandwich with the internal wall between the external wall and the internal volume,
• the syringe main body comprising, at least in portions, a cycloolefin as a first material, which first material forms the internal wall, and
• a connection piece with a threaded connection arranged on the external wall of the front wall of the syringe body, the connection piece, at least in portions, comprising a second plastic material different than the first material, wherein the syringe main body and the connection piece are integrally bonded to one another to form the syringe body, and
• wherein a structure extending distally from or proximally into the distal front surface of the internal wall and a complementary structure on the proximal rear surface of the external wall engage into one another with the structure between (i) the complementary structure and (ii) the internal volume in a direction along the longitudinal axis.