Patent ID: 7470260
Filing Date: 2008-12-30
Classification: A61M

Abstract:
1. An administering apparatus for administering a fluid product, said administering apparatus comprising: a) a casing including a reservoir for the product; b) a piston which is accommodated in the reservoir such that it can be shifted in an advancing direction to administer product; c) a piston rod which acts on the piston in the advancing direction and forms a first blocking means; d) a second blocking means which cannot be moved relative to the casing counter to the advancing direction; e) a blocking element row, formed by successively arranged first blocking elements, extending in the advancing direction, and formed by the first blocking means; f) a second blocking element formed by the second blocking means and engaged with the blocking element row, wherein it engages with a set of blocking element gaps of the blocking element row, the blocking element gaps arranged between each of the successively arranged first blocking elements; wherein g) the second blocking element is moved out of engagement by a movement, against an elasticity force, of the piston rod in the advancing direction, but when engaged counteracts a movement of the piston rod counter to the advancing direction with a resistance force which is greater than the elasticity force to prevent the piston rod from moving counter to the advancing direction; wherein h) a block securing element is carried on the first blocking means, said block securing element formed as an end of the blocking element row and protrudes transversely to the advancing direction beyond the successively arranged first blocking elements; and wherein i) the piston rod comprises a threaded section and a cavity extending in the advancing direction, in which the first blocking means and block securing element are formed, the block securing element formed in the cavity transversely to the advancing direction and does not protrude beyond a root of the thread of the threaded section.