Selectable dose injection device with latch mechanism

Abstract

A substance delivery device for delivering a substance from a container includes a body, and a plunger movable with respect to the body so as to expel at least a portion of a substance from the container, a trigger mechanism, a latch member latched in a stationary position at least along the longitudinal axis of the device before use, and a lockout shroud movable along the longitudinal axis relative to the latch mechanism. User manipulation of the trigger mechanism causes the latch mechanism to become unlatched and move along the longitudinal axis and to cause movement of a plunger relative to the body, and in a first position of the lockout shroud along the longitudinal axis relative to the latch member, the lockout shroud prevents the trigger mechanism from unlatching the latch member, whereas in a second position the lockout shroud allows the trigger mechanism to unlatch the latch member.

1 - 18 . (canceled) 
     
     
         19 . A substance delivery device for delivering a substance from a container, the device comprising a body, a plunger which is movable with respect to the body so as to expel at least a portion of a substance from a container, a trigger mechanism, a latch member latched in a stationary position at least along the longitudinal axis of the device before use, a lockout shroud being moveable along the longitudinal axis relative to the latch mechanism, wherein user manipulation of the trigger mechanism causes the latch member to become unlatched and able to move along the longitudinal axis and to enable movement of a plunger relative to the body, and in a first position of the lockout shroud along the longitudinal axis relative to the latch member, the lockout shroud prevents the trigger mechanism from unlatching the latch member, whereas in a second position the lockout shroud allows the trigger mechanism to unlatch the latch member. 
     
     
         20 . The substance delivery device as claimed in  claim 19  wherein the lockout shroud comprises one or more members configured, when the lockout shroud is in the first position, to prevent movement of one or more portions of the latch member, which in turn prevents the trigger mechanism from unlatching the latch member. 
     
     
         21 . The substance delivery device as claimed in  claim 19 , wherein a needle guard is accommodated at one end of the lockout shroud. 
     
     
         22 . The substance delivery device as claimed in  claim 21 , wherein before use of the device the end of the lockout shroud stands proud of the needle guard and after the device is fired, the needle guard is retained by the lockout shroud but stands proud of the end of the lockout shroud. 
     
     
         23 . The substance delivery device as claimed in  claim 19 , wherein the degree of movement between the plunger and the body determines the amount of substance that is delivered and the device comprises, an instance of one or more co-operating features associated with the plunger, and a corresponding instance of one or more co-operating features associated with the body, whereby co-operation between the two instances of co-operating features determines the degree of movement between the plunger and the body, wherein there is a plural instances of said one or more co-operating features associated with at least one of the plunger and the body, and co-operation between different instances of co-operating features allows different ranges of movement between the plunger and the body. 
     
     
         24 . The substance delivery device as claimed in  claim 23 , wherein there is a single instance of one or more co-operating features associated with one of the body and the plunger and plural instances of one or more co-operating features associated with the other of the plunger and the body. 
     
     
         25 . The substance delivery device as claimed in  claim 23 , wherein the at least one instance of one or more co-operating features associated with the plunger is located on an external surface of the plunger. 
     
     
         26 . The substance delivery device as claimed in  claim 23 , wherein the at least one instance of one or more co-operating features associated with the body is located on an internal surface of the body. 
     
     
         27 . The substance delivery device as claimed in  claim 23 , wherein the plural instances of one or more co-operating features associated with one of the plunger and the body each comprise one or more tracks, and the or each track of a first instance of the one or more co-operating features is relatively long compared with the or each track of a further instance of the co-operating features. 
     
     
         28 . The substance delivery device as claimed in  claim 27 , wherein a single instance of one or more co-operating features comprises an instance of one or more pegs associated with one of the plunger and the body, the or each peg configured to follow each said track. 
     
     
         29 . The substance delivery device as claimed in  claim 23 , wherein relative rotation of the plunger and body determines which instance of one or more co-operating features associated with the body or the plunger is selected for co-operation with the corresponding instance of at least one co-operating feature associated with the other of the body and the plunger. 
     
     
         30 . The substance delivery device as claimed in  claim 29 , wherein the device further comprises a selector rotatable by a user for causing relative rotation of the plunger relative to the body. 
     
     
         31 . The substance delivery device as claimed in  claim 19  and comprising a container carrier housed within the body for receiving a substance container, wherein the container carrier is move-able along a longitudinal axis of the device relative to the body during a substance delivery process, wherein a surface of the container carrier includes at least one visual indicator that can be seen through a window in the body in at least one of the positions of the container carrier. 
     
     
         32 . The substance delivery device as claimed in  claim 31 , wherein the container carrier carries two visual indicators, at least one of the visual indicators is not visible to a user in at least one position of the container carrier. 
     
     
         33 . The substance delivery device as claimed in  claim 31 , wherein the lockout shroud is housed coaxially within the body of the device, the container carrier being housed within the lockout shroud and the lockout shroud comprises a cut out portion whereby a portion of the container carrier can be seen through the window of the body. 
     
     
         34 . A substance delivery device for delivering a substance from a container, the device comprising a body, a plunger which is movable with respect to the body so as to expel at least a portion of a substance from a container, a container carrier housed within the body for receiving a substance container, wherein the container carrier is move-able along a longitudinal axis of the device relative to the body during a substance delivery process, wherein and a surface of the container carrier includes at least one visual indicator that can be seen through a window in the body in at least one of the positions of the container carrier. 
     
     
         35 . The substance delivery device as claimed in  claim 34 , wherein the container carrier carries two visual indicators, at least one of the visual indicators is not visible to a user in at least one position of the container carrier. 
     
     
         36 . The substance delivery device as claimed in  claim 34 , further comprising a lockout shroud housed coaxially within the body of the device, the container carrier being housed within the lockout shroud and the lockout shroud comprises a cut out portion whereby a portion of the container carrier can be seen through the window of the body.