embodiments of present invention will now be described in detail . as it should be noted in present application , when the term “ distal part / end ” is used , this refers to the part / end of the delivery device , or the parts / ends of the members thereof , which is / are located the furthest away from the medicament delivery site of the patient . correspondingly , when the term “ proximal part / end ” is used , this refers to the part / end of the delivery device , or the parts / ends of the members thereof , which , is / are located closest to the medicament delivery site of the patient . according to the main aspect of the invention , a medicament delivery device comprises a tubular housing having a proximal and an opposite distal end ; an actuator member movably arranged in relation to said tubular housing for triggering a medicament delivery ; a medicament container arranged within the tubular housing and having a delivery member protruding through the proximal end of the tubular housing ; a cap releasably connected to the proximal end of the tubular housing and covering the delivery member ; and interlocking means arranged to interact with both the actuator member and the cap such that the actuator member can only be manually actuated when the cap is removed . according to a further aspect of the invention , the interlocking means is a longitudinal actuator interlocking member , movably arranged within the tubular housing and arranged to interactively co - act with both the actuator member and the cap for avoiding unintentional actuation of the actuator member . according to another aspect of the invention , the actuator interlocking member and the cap are connectable to each other by a first co - acting means and wherein the actuator interlocking member and the actuator member are connectable to each other by a second co - acting means . an exemplary embodiment of the present invention is shown in the fig1 - 10 . the exemplary embodiment shown in the figures is a medicament injector but is not restricted to it . fig1 is a perspective view of exemplary components of a complete medicament delivery device 100 according to the invention . in fig1 is illustrated the pre - assembled medicament delivery device 100 having the cap 140 interactively mounted to the tubular housing 120 , 130 and the medicament container 170 , arranged within the tubular housing and having the delivery member as e . g . a needle , a nozzle , a mouth piece or the like protruding through the proximal end of the tubular housing . the cap is arranged to cover the delivery member when the cap is connected to the proximal end 308 of the tubular housing 120 , 130 . in the exemplary embodiment of the invention , the tubular actuator member 110 is axially slidable and coaxially arranged within a distal end 309 portion of the tubular housing 120 , 130 , but not restricted to it . the medicament delivery device 100 further comprises drive means arranged within said tubular housing adapted to , upon activation , act on a slidable stopper 162 inside the medicament container 170 to expell a dose of medicament ; and hold - release means interactively connected to the drive means to hold said drive means in a pre - loaded state , as well as to the actuator member 110 to release the drive means form the pre - loaded state , such that when the cap 140 is removed from the tubular housing , the actuator member may be enabled to act with the hold - release means and thereby release the drive means from the pre - loaded state . the drive means comprises a plunger rod 161 and an energy accumulating means 160 interactively connected to each other . in the exemplary embodiment of the invention , as shown in fig6 c , the plunger rod 161 comprises a plunger rod head 612 for pushing the slidable stopper 162 and a plunger rod coupling member 611 . the tubular housing 120 , 130 comprises cut - outs 303 , 304 , fig3 a , adapted to receive a third co - acting means 201 , fig2 b , of the actuator member 110 , for interactively and fixedly attaching the actuator member 110 to the tubular housing 120 , 130 . in an exemplary embodiment of the invention the further cut - out 303 , 304 comprises two openings adapted to receive the third co - acting means 201 of the actuator member 110 in two steps , a first cut - out 303 for releaseably attaching the actuator member 110 to the tubular housing 120 , 130 in a first inactivated position , and a second cut - out 304 , whereby the actuator member 110 is fixedly attached to the tubular housing 120 , 130 in a second activated position after the actuator member has been moved towards the proximal end . the actuator member 110 also comprises guiding means 203 arranged to interact with corresponding guiding means on the inner surface of the tubular housing , which in the exemplary embodiment of the invention are groove tracks ; and the corresponding guiding means of the tubular member are longitudinally extending ledges which guide the axial movement of the actuator member 110 within the tubular housing 120 , 130 . the hold - release means comprises flexible co - acting means 202 arranged on the actuator member , and flexible coupling means 312 arranged to the tubular housing , whereby said flexible co - acting means 202 and said flexible coupling means 312 are arranged to interact with each other to release the drive means from the pre - loaded state . in the exemplary embodiment of the invention , the flexible co - acting means 202 are two flexible tongues , fig2 b , extending in a proximal direction from the actuator member , and the flexible coupling means 312 are two flexible tongues extending in a distal direction from an inner distal end transversal wall 311 of the tubular housing , fig3 b , whereby said flexible co - acting means 202 and said flexible coupling means 312 are arranged to interact with each other as will be explained below . fig3 a illustrates a perspective view of the tubular housing 120 , 130 . a distal part 120 of the tubular housing 120 , 130 comprises a recess , an opening or a cut - out 301 adapted to receive a corresponding fastening means 302 of a proximal part 130 of the tubular housing 120 , 130 for fixedly attaching the distal part 120 to the proximal part 130 of the tubular housing 120 , 130 during the manufacturing process of the medicament delivery device 100 . in an exemplary embodiment of the invention , the corresponding fastening means 302 of the proximal part 130 of the tubular housing 120 , 130 comprises two radial outward extending flexible tongues which are adapted to lock into the cut - out 301 which is adapted to receive said corresponding fastening means 302 . the proximal part 130 of the tubular housing 120 , 130 also comprises a coupling means 305 in the shape of radial outward extensions , i . e . an outward extending thread , adapted to interact and engage with a corresponding coupling means 401 , i . e . an inner thread , of the cap 140 . the proximal part 130 of the tubular housing 120 , 130 further comprises a recess , or a track groove , adapted to guide the actuator interlocking member 150 . fig3 b illustrates , in a perspective cross - sectional view of the tubular housing 120 , 130 . the distal end 309 part of the tubular housing 120 , 130 comprises a housing compartment 310 for housing the energy accumulating means 160 . in the most distal part of the tubular housing 120 , 130 is situated the coupling means 312 for interactively coupling the plunger rod 161 to the tubular housing 120 , 130 . fig4 a shows a perspective view of an exemplary cap 140 and fig4 b illustrates a perspective , exploded view of the cap 140 comprising a coupling means 401 , e . g . in the form of threads on an inner surface of the cap 140 , adapted to be interactively connected to a corresponding coupling means 305 of the tubular housing 120 , 130 . fig4 c illustrates a distal view of the cap 140 , showing a longitudinal recess 402 adapted to receive and contain a proximal portion of the actuator interlocking member 150 . the cap 140 also comprises the coupling means 401 , e . g . in the shape of internal threads , interactively connected to corresponding coupling means 305 of the tubular housing 120 , 130 . preferably , the pitches of the threads are chosen such that there is a major longitudinal movement of the cap 140 in the proximal direction for a small turning angle , in order to avoid the user needing to turn the cap 140 more than about half a turn when performing the operation , so as to avoid them having to change grip to finish the operation of removing the cap 140 . in the exemplary embodiment , the second co - acting means comprises a proximal annular ledge 204 , fig2 a , of the actuator member 110 and at least one distally extending tongue 501 , fig5 , of the actuator interlocking member 150 . also the first co - acting means comprises a partial outer thread 503 on the outer proximal end surface of at least one proximally extending tongue 502 of the actuator interlocking member 150 , fig5 , and the coupling means 401 , e . g . in the shape of internal threads , on the inner circumferential surface of the cap 140 . in the exemplary embodiment of the invention the partial outer thread 503 has the same thread pitch as the threads of the outer thread of the tubular housing 120 , 130 ; i . e . the co - acting means 305 of the tubular housing 120 , 130 . fig6 a illustrates a cross - sectional side view of the energy accumulating means 160 and fig6 b illustrates the same energy accumulating means 160 but now in a cross - sectional side view . in the exemplary embodiment , the energy accumulating means is a volute spring but a spiral compression spring or a torsion spring can be used as well . fig6 c illustrates a perspective side view of the plunger rod 161 and the slidable stopper 162 . the plunger rod comprises the plunger rod coupling member 611 , and the plunger rod head 612 . fig7 illustrates the interior components of the medicament delivery device 100 including the plunger rod 161 having the plunger rod head 612 , the energy accumulating member 160 , the slidable stopper 162 , the medicament container 170 and the delivery member as e . g . a needle 710 . fig8 a illustrates a cross - sectional perspective view , of the distal part of the tubular housing 120 , 130 and of the actuator member 110 in the first inactivated position wherein the plunger rod 161 and the energy accumulating means 160 are in a pre - loaded state i . e . the plunger rod coupling member 611 is releasably connected to the flexible coupling means 312 and a distal end of the energy accumulating means 160 is pre - loaded and arranged between the proximal annular surface of the inner distal end wall 311 of the tubular housing 120 , 130 and the annular distal surface of the plunger rod head 612 fig8 b illustrates in a cross - sectional perspective view , of the distal part of the tubular housing 120 , 130 and of the actuator member 110 in the second activated position wherein the actuator 110 has been pressed down in a proximal direction , thus forcing the flexible co - acting means 202 in a proximal direction to enable the flexible coupling means 312 to expand in a radial outward direction and thereby allow the plunger rod coupling member 611 to be released from said flexible coupling means 312 . fig9 a illustrates , in perspective , an exemplary medicament delivery device 100 having the actuator member 110 in the first inactivated position , coaxially arranged at the distal end 309 of the tubular housing 120 , 130 and the cap 140 releasably connected , i . e . detachable , to the proximal end 308 of the tubular housing 120 , 130 . in the exemplary embodiment , the longitudinal actuator interlocking member 150 is axially slidable within the tubular housing between a locked position in which the proximal first co - acting means 503 are connected to the corresponding first co - acting means 401 of the cap 140 and the distal second co - acting means 501 are abutting to the corresponding second co - acting means 204 of the actuator member 110 such that the actuator member is prevented from being actuated , and an unlocked position in which the proximal first co - acting means 503 are disconnected from the corresponding first co - acting means 401 of the cap 140 and the distal second co - acting means 501 are abutting to a corresponding second co - acting means 204 of the actuator member 110 such that the actuator member is allowed to be actuated . fig9 b illustrates , in perspective , an exemplary medicament delivery device 100 wherein the actuator member 110 is in the second activated position and wherein the longitudinal actuator interlocking member 150 has been moved from the locked position to the unlocked position . further , the first co - acting means 503 of the interlocking member 150 which in the exemplary embodiment is illustrated as a partial outer thread , corresponds to the outer thread 305 of the tubular housing both when the interlocking member is in the locked position and in the unlocked position . fig1 a and fig1 b illustrate also a perspective cross - sectional view of the operations described in fig9 a and fig9 b the present invention is not limited to the above - described preferred embodiment . various alternatives , modifications and equivalents may be used . therefore , the above embodiment should not be taken as limiting the scope of the invention , which is defined by the appended claims .
provided is a medicament delivery device that is reliable , safe and intuitive to use and at the same time is easy to use when handling . this is achieved by a medicament delivery device comprising a tubular housing having a proximal end and an opposite distal end , an actuator member being coaxially arranged at the distal end of the tubular housing and movably arranged , in relation to the tubular housing and a cap being releasably connected to the proximal end of the tubular housing wherein the medicament device further comprises a longitudinal actuator interlocking member movably arranged within the tubular housing and interactively connected to both the actuator member and to the cap for controlling movement of the actuator member . thus the cap acts as a device enabler , i . e . it is impossible to actuate the medicament delivery device until the cap has been removed .