Injector for administering a liquid or pasty substance, in particular a drug

#This application claims priority to German Patent Application No. 10 2014 018 077.8. entitled “Injector for Admisitering a Liquid or Pasty Substance, in Particular a Drug,” filed on Dec. 5, 2014, and German Patent Application No. 10 2015 002 234.2, filed on Feb. 19, 2015, and also claims priority to European Patent Application No. 15175696, filed on Jul. 7, 2015, the entire contents of each of which are hereby incorporated by reference in their entirety for all purposes.

#The present disclosure relates to an injector for administering a first or a second liquid or pasty substance. The first and/or second liquid or pasty substance can in particular be a drug or a substance containing one or more drugs.

#The injector comprises an outer injector body, an inner injector body and a plunger. A first volume for the first liquid or pasty substance is formed in the outer injector body. A second volume for the second liquid or pasty substance is formed in the inner injector body. The inner injector body is longitudinally displaceably guided in the outer injector body. It can there be longitudinally guided in a rotatable or non-rotatable manner. The plunger is longitudinally displaceable guided in the inner injector body. It can there be longitudinally guided in a rotatable or non-rotatable manner.

#FIG. 1 shows a first embodiment of the present disclosure in the starting position in a lateral sectional view.

#FIG. 2 shows the subject of FIG. 1 after the administering of the first liquid or pasty substance.

#FIG. 3 shows the subject of FIGS. 1 and 2 after the administering of the second liquid or pasty substance.

#The first embodiment of the injector in accordance with the present disclosure shown in FIGS. 1 to 4 comprises an outer injector body 1, an inner injector body 2 and a plunger 3. The outer injector body 1 comprises an upper margin 4, which is outwardly directed, a jacket part 5, a base wall 6, and an administration spout 7. The jacket part 5 is cylindrical. It has an inner wall 8 along which the inner injector body 2 is longitudinally displaceably guided. The base wall 6 has an administration opening 9 at its center, the administration opening being connected to an administration channel 10 in the administration spout 7. The outer injector body 1 is formed in one piece.

#The inner injector body 2 comprises a jacket part 11, a base wall 12, and a cuff 13. The jacket part 11 is cylindrical. Its outer wall is longitudinally displaceably guided along the inner wall 8 of the jacket part 5 of the outer injector body 1. For this purpose, the jacket part 11 has a sealing surface 11a at its lower end, with the diameter of said sealing surface being larger than the remaining diameter of the jacket part 11. The sealing surface 11a contacts the inner wall 8. The main function of the sealing surface 11a comprises ensuring a seal. It furthermore also satisfies a guiding function.

#The jacket part 11 has an inner wall 14 in which the plunger 3 is longitudinally displaceably guided. Channels 15 are present in the base wall 12 of the inner injector body 2. The channels 15 are evenly distributed over the periphery.