Drug delivery device with proximity sensor

Abstract

A drug delivery device, in the form of an injector, may include one of a number of systems for limiting the delivery of a medical fluid or drug product in case of movement of (e.g., removal of) the injector relative to the patient as determined by a proximity sensor. The drug delivery system may in the alternative or in addition include systems for indicating the amount of medical fluid or drug product delivered (or not delivered) in case of movement of (e.g., removal of) the injector relative to the patient as determined by the proximity sensor. The injector may be, for example, an on-body injector or an hand-held autoinjector.

What is claimed: 
     
         1 . An on-body injector comprising:
 a reservoir including a bore having a first end and a second end, and a plunger assembly including a plunger moveable within the bore between the first and second ends;   a volume of a drug product disposed in the reservoir, the drug product comprising a monoclonal antibody (IgG) that binds human Proprotein Convertase Subtilisin/Kexin Type 9 (PCSK9);   a cannula having an operational state wherein the cannula is connected in fluid communication with the reservoir;   a drive coupled to the plunger assembly to move the plunger between the first and second ends for moving the drug product out of the reservoir and through the cannula;   a housing, wherein the reservoir, the cannula, and the drive are disposed at least partially within the housing; and   a proximity sensor operably coupled to move relative to the housing, the proximity sensor having a first sensor state wherein the proximity sensor extends from the housing and a second sensor state wherein the proximity sensor is retracted toward the housing relative to the first sensor state.   
     
     
         2 . The on-body injector of  claim 1 , further comprising a lock configured to selectively limit movement of the plunger between the first and second ends of the reservoir. 
     
     
         3 . The on-body injector of  claim 2 , wherein the lock comprises a wall of a plate that moves along a line of motion and is operably coupled to one of the plunger assembly and the drive when the proximity sensor is in the first sensor state. 
     
     
         4 . The on-body injector of  claim 3 , wherein the plate has a first end that defines the wall of the lock and a second end that defines the proximity sensor. 
     
     
         5 . The on-body injector of  claim 1 , wherein the lock comprises a wall of a lever that moves about a pivot and is operably coupled to one of the plunger assembly and the drive when the proximity sensor is in the first sensor state. 
     
     
         6 . The on-body injector of  claim 5 , wherein the lever has a first end disposable within the housing and defining the wall of the lock, and a second end disposable outside of the housing and defining the proximity sensor. 
     
     
         7 . The on-body injector of  claim 1 , wherein the drive comprises a spring. 
     
     
         8 . The on-body injector of  claim 7 , wherein the lock is selectively coupled to one of the plunger and the spring when the proximity sensor is in the first sensor state. 
     
     
         9 . The on-body injector of  claim 3 , wherein:
 the plunger assembly includes a plunger arm attached to the plunger;   the wall of the lock that abuts the plunger arm to limit movement of the plunger when the lock is coupled to the plunger assembly; and   the proximity sensor is coupled to the wall, where the wall abuts the plunger arm when the proximity sensor is in the first sensor state and the wall is spaced from the plunger arm when the proximity sensor is in the second sensor state.   
     
     
         10 . The on-body injector of  claim 9 , wherein:
 the plunger arm has at least one shoulder formed thereon; and   the wall of the lock abuts the at least one shoulder of the plunger arm to limit movement of the plunger when the lock is coupled to the plunger assembly.   
     
     
         11 . The on-body injector of  claim 8 ,
 the wall of the lock abuts the spring to limit movement of the plunger when the lock is coupled to the plunger assembly; and   the proximity sensor is attached to the wall, where the wall abuts the spring when the proximity sensor is in the first sensor state and the wall is spaced from the spring when the proximity sensor is in the second sensor state.   
     
     
         12 . The on-body injector of  claim 1 , wherein the drive comprises a gas source and the lock comprises a vent operably coupled to the gas source to exhaust positive pressure from the gas source when the proximity sensor is in the first sensor state. 
     
     
         13 . The on-body injector of  claim 12 , further comprising a chamber disposed between and connecting the gas source and the reservoir, the vent disposed in a wall of the chamber. 
     
     
         14 . The on-body injector of  claim 12 , wherein the vent comprises a seal and a vent cannula, wherein the vent cannula pierces the seal when the proximity sensor is in the first sensor state. 
     
     
         15 . The on-body injector of  claim 13 , further comprising a vent lever having a first end connected to the vent cannula and a second end connected to the proximity sensor such that movement of the proximity sensor is transmitted to the vent cannula via the vent lever. 
     
     
         16 . The on-body injector of  claim 1 , wherein the lock comprises a valve disposed between the reservoir and the cannula, the valve being movable between open and closed states and occupying the closed state when the proximity sensor is in the first sensor state. 
     
     
         17 . The on-body injector of  claim 16 , further comprising a controller coupled to the proximity sensor and the valve for positioning the valve in the closed state when the proximity sensor is in the first sensor state. 
     
     
         18 . The on-body injector of  claim 16 , further comprising a fluid line disposed between and connecting the reservoir and the cannula, the valve disposed on the fluid line. 
     
     
         19 . The on-body injector of  claim 1 , further comprising a flexible fluid line disposed between the reservoir and the cannula. 
     
     
         20 . The on-body injector of  claim 2 , further comprising a flexible fluid line disposed between the reservoir and the cannula. 
     
     
         21 . The on-body injector of  claim 20 , wherein the movable plate comprises an aperture through which the flexible fluid line is disposed. 
     
     
         22 . The on-body injector of  claim 2 , wherein the lock comprises a wall and a first end of the cannula resides within the wall and out of fluid communication with the reservoir when the proximity sensor is in the first sensor state. 
     
     
         23 . The on-body injector of  claim 22 , further comprising a biasing member biasing the first end of the cannula to reside within the wall. 
     
     
         24 . The on-body injector of  claim 22 , wherein the first end of the cannula penetrates the wall and is in fluid communication with the reservoir when the proximity sensor is in the second sensor state. 
     
     
         25 . The on-body injector of  claim 1 , further comprising an indicator selectively coupled to the plunger assembly when the proximity sensor is in the second sensor state and selectively decoupled for the plunger assembly when the proximity sensor is in the first sensor state. 
     
     
         26 . The on-body injector of  claim 25 , wherein the indicator is mechanically coupled to the plunger assembly when the proximity sensor is in the second sensor state. 
     
     
         27 . The on-body injector of  claim 26 , wherein the plunger assembly comprises a plunger arm attached to the plunger, the indicator being mechanically coupled to the plunger arm through a gear train having at least one gear that is moveable into and out of engagement, and the proximity sensor is coupled to the at least one gear to move the at least one gear out of engagement and decouple the indicator from the plunger arm with the proximity sensor in the first sensor state.