Administering apparatus with a resettable activating block

Abstract

An administering apparatus for administering an injectable substance in doses is provided. The apparatus includes a casing with a reservoir for the substance, a conveying mechanism which acts to deliver a selected dose of the substance from the reservoir, a dosing and activating mechanism which performs a dosing movement and a delivery movement, and which is coupled to the conveying mechanism such that the delivery movement causes the selected dose to be delivered, a dosage indicator sleeve coupled to the dosing and activating mechanism, and a blocking member in a blocking engagement with the dosing and activating mechanism.

1 . An administering apparatus for administering an injectable product in selected doses, said administering apparatus comprising:
 a) a casing configured to hold a reservoir containing the product;   b) a piston rod configured to act on the product to deliver a selected product dose from the reservoir;   c) a dose setting member for performing a dosing movement and for causing delivery of a selected dose, said dose setting member operably coupled to the piston rod such that a delivery movement of the dose setting member causes the selected product dose to be delivered via actuation of the piston rod;   d) a dose indicator sleeve coupled to the dose setting member such that the dose indicator sleeve is moved relative to the casing by the dosing movement of the dose setting member to indicate the selected product dose, the dose indicator sleeve comprising a reset cam protruding from the dose indicator sleeve; and   e) a blocking member in a blocking engagement with the dose setting member in the front end position of the dose setting member to prevent the dose setting member from moving counter to an activating direction;   f) wherein the blocking member comprises a counter reset cam protruding from the blocking member, and in a zero-dose position of the dose indicator sleeve, said reset cam and counter reset cam engage such that the blocking member is pressed out of the blocking engagement with the dose setting member.   
   
   
       2 . The administering apparatus as set forth in  claim 1 , wherein the dose indicator sleeve surrounds the blocking member and the reset cam protrudes from an inner surface area of the dose indicator sleeve. 
   
   
       3 . The administering apparatus as set forth in  claim 2 , wherein the reset cam is widened on at least one side, as far as the inner surface area of the dose indicator sleeve. 
   
   
       4 . The administering apparatus as set forth in  claim 1 , wherein the blocking member comprises an at least partially annular body, and an elasticity force acts on a side of the at least partially annular body opposite the counter reset cam with respect to a central longitudinal axis of the at least partially annular body and is directed toward the counter reset cam. 
   
   
       5 . The administering apparatus as set forth in  claim 1 , wherein the dose indicator sleeve is coupled to the casing via a threaded engagement which defines the movement of the dose indicator sleeve. 
   
   
       6 . The administering apparatus as set forth in  claim 5 , further comprising a mechanism holder coupled to the casing such that the mechanism holder is nonmovable with respect to the dosing movement and the delivery movement, said mechanism holder comprising an outer thread and the dose indicator sleeve comprising an inner thread, said threads in engagement with each other. 
   
   
       7 . The administering apparatus as set forth in  claim 1 , wherein an upper surface area of the dose indicator sleeve comprises a dose scale encircling a longitudinal axis of the dose indicator sleeve in a spiral. 
   
   
       8 . The administering apparatus as set forth in  claim 1 , wherein the blocking member is pressed against the dose setting member, transversely with respect to the activating direction, by the elasticity force of a spring element, and the dose setting member comprises a cavity toward which the blocking member presses during the delivery movement of the dose setting member, wherein the blocking member is pressed into said cavity to establish the blocking engagement in the front end position of the dose setting member. 
   
   
       9 . The administering apparatus as set forth in  claim 8 , wherein the reset cam is tapered in a circumferential direction in an area that presses against the counter reset cam such that the reset cam moves the blocking member out of cavity of the dose setting member. 
   
   
       10 . The administering apparatus as set forth in  claim 9 , wherein the reset cam moves the blocking member out of the cavity against the restoring force of the spring element. 
   
   
       11 . The administering apparatus as set forth in  claim 9 , further comprising a restoring spring coupled to the dose setting member for exerting a restoring force on the dose setting member, such that when the blocking engagement is released upon movement of the blocking member out of the cavity, the restoring spring presses the dose setting member out of the front end position and into a dose selection position. 
   
   
       12 . The administering apparatus as set forth in  claim 1 , further comprising a transfer member operably coupled to the dose setting member and to the piston rod, wherein the delivery movement of the dose setting member into the front end position moves the piston rod, via the transfer member, to cause the selected product dose to be delivered. 
   
   
       13 . The administering apparatus as set forth in  claim 12 , wherein the dose setting member comprises an activating part protruding out of the casing and is movable in the activating direction relative to the transfer member, against an elasticity force, to enable the dose setting member to spring-deflect in the front end position. 
   
   
       14 . The administering apparatus as set forth in  claim 13 , wherein the blocking member forms the blocking engagement with the activating part. 
   
   
       15 . The administering apparatus as set forth in  claim 14 , wherein the blocking member forms a stopper for the activating part, and wherein said stopper stops the activating part moving in the activating direction. 
   
   
       16 . The administering apparatus as set forth in  claim 1 , wherein the dose setting member is coupled to the dose indicator sleeve, secured against rotating in the dose selection position, but such that it can move in the activating direction relative to the dose indicator sleeve. 
   
   
       17 . The administering apparatus as set forth in  claim 1 , wherein the operable coupling between the dose setting member and the dose indicator sleeve causes the dose indicator sleeve to be slaved during the dosing movement of the dose setting member, but permits the delivery movement of the dose setting member relative to the dose indicator sleeve. 
   
   
       18 . The administering apparatus as set forth in  claim 17 , wherein the operable coupling is released in the front end position of the dose setting member. 
   
   
       19 . The administering apparatus as set forth in  claim 1 , wherein the dosing movement is a rotational movement about a rotational axis and the delivery movement is a translational movement along the rotational axis.