Patent ID: 8092421

Claim:
A two-chamber carpule for use with a pen system comprising: a) a first part-cylinder having a proximal end and a distal end, on a head side, which forms a first chamber, containing a bypass, an opening for receiving an intermediate plug at the proximal end, and an intermediate plug in the opening of the proximal end, b) a liquid- and gas-tight closure at the end on the head side of the first part-cylinder, on the head side, c) a second part-cylinder having a proximal end and a distal end, on the head side, which fowls a second portion of the two-chamber carpule assigned to the second chamber, containing an opening at the distal end, an opening for receiving an end plug at the end on a plunger side, and an end plug in the opening of the end on the plunger side of the second part-cylinder, and optionally a second intermediate plug at the distal end; d) optionally a sealing element between the first part-cylinder and the second part-cylinder; and e) an axial groove in a receiving part-cylinder on either the proximal end of the first part-cylinder, on the head side, or on the distal end of the second part-cylinder, on the plunger side, where the axial groove is configured to allow pressure to escape when the first part-cylinder and the second part-cylinder are joined together during assembly, wherein the first part-cylinder and second part-cylinder when in an assembled state contains a preparation and is configured to be inserted and installed into a pen system.