referring first to fig1 to 5 , there is shown a drug delivery device 1 in accordance with the one arrangement in a plurality of operating positions : for dose setting and for dose administration or injection . the drug delivery device 1 comprises a housing having a first cartridge retaining part 2 , and second main ( exterior ) housing part 4 . a first end of the cartridge retaining means 2 and a second end of the main housing 4 are secured together by retaining features 6 . in this illustrated arrangement , the cartridge retaining means 2 is secured within the second end of the main housing 4 . a cartridge 8 from which a number of doses of a medicinal product may be dispensed is provided in the cartridge retaining part 2 . preferably , the cartridge contains a type of medicament that must be administered often , such as once or more times a day . one such medicament is insulin . a piston 10 is retained in a first end of the cartridge . a removable cap 12 is releasably retained over a second end of the cartridge retaining part 2 . the dose setting mechanism of the drug delivery device illustrated in fig1 - 5 may be utilized as either a disposable or reusable drug delivery device . where the drug delivery device comprises a disposable drug delivery device , the cartridge cannot be removed from the device without destroying the device . alternatively , where the drug delivery device comprises a reusable drug delivery device , the cartridge is removable and may be removed from the device without destroying the device . in the drug delivery device 1 illustrated in fig1 - 5 , this drug delivery device is illustrated as a disposable drug delivery . however , those of ordinary skill in the art will recognize that the dose setting mechanism could also be used on reusable drug delivery devices as well . in use , the removable cap 12 can be replaced by a user with a suitable needle unit ( not shown ). such needle unit may be screwed onto a distal end of the housing or alternatively may be snapped onto this distal end . a replaceable cap 14 is used to cover the cartridge retaining part 2 extending from the main housing 4 . preferably , the outer dimensions of the replaceable cap 14 are similar or identical to the outer dimensions of the main housing 4 so as to provide an impression of a unitary whole when the replaceable cap 14 is in position covering the cartridge retaining part 2 . in the illustrated arrangement , an insert 16 is provided at a first end of the main housing 4 . the insert 16 is secured against rotational or longitudinal motion . the insert 16 is provided with a threaded circular opening 18 . alternatively , the insert may be formed integrally with the main housing having the form of a radially inwardly directed flange having an internal thread . a first helical groove 19 extends from a first end of a piston rod 20 . in one arrangement , the piston rod 20 is of generally circular in cross section however other arrangements may also be used . the first end of the piston rod 20 ( a distal end of the piston rod 20 ) extends through the threaded opening 18 in the insert 16 . a pressure foot 22 is located at the first end or distal end of the piston rod 20 . the pressure foot 22 is disposed to abut a second end of the cartridge piston 10 . a second helical groove 24 extends 15 from a second end of the piston rod 20 ( a proximal end of the piston rod 20 ). in the illustrated arrangement , the second helical groove 24 extends from a second end or proximal end of the piston rod 20 . in the illustrated arrangement , the second helical groove 24 comprises a series of part helical grooves rather than a complete helical groove . one advantage of this illustrated arrangement is that it is generally easier to manufacture and helps to reduce the overall force required for a user to actuate the device when dispensing the medicinal product from the drug delivery device 1 . the first helical groove 19 and the second helical groove 24 are oppositely disposed , i . e ., the grooves are of opposite hand . the second end of the piston rod 20 ( i . e ., the proximal end of the piston rod 20 ) is provided with a receiving recess 26 . a drive sleeve 30 extends about the piston rod 20 . the drive sleeve 30 is generally cylindrical . the drive sleeve 30 is provided at a first end with a first radially extending flange 32 . a second radially extending flange 34 is provided spaced a distance along the drive sleeve 30 from the first flange 32 . an intermediate helical groove 36 is provided on an outer part of the drive sleeve 30 extending between the first flange 32 and the second flange 34 . a helical groove 38 extends along the internal surface of the drive sleeve 38 . the second helical groove 24 of the piston rod 20 is adapted to work within the helical groove 38 . a first end of the first flange 32 is adapted to conform to a second side of the insert 16 . a part nut 40 is located between the drive sleeve 30 and the main housing 2 , disposed between the first flange 32 and the second flange 34 . in the illustrated arrangement , the part nut 40 comprises a half - nut . the part nut 40 has an internal helical groove matching the intermediate helical groove 38 of the drive sleeve 30 . in one preferred arrangement , the outer surface of the part nut 40 and an internal surface of the main 5 housing 4 are keyed together by way of splines 42 ( see , also fig1 , 11 , 15 and 16 ) to prevent relative rotation between the part nut 40 and the main housing 4 , while allowing relative longitudinal in movement between these two components . a shoulder 37 is formed between a second end of the drive sleeve 30 ( a proximal end of the drive sleeve 30 ) and an extension 38 provided at the second end of the drive sleeve 30 ( a distal end of the drive sleeve 30 ). the extension 38 has reduced inner and outer diameters in comparison to the remainder of the drive sleeve 30 . a second end of the extension 38 is provided with a radially outwardly directed flange 39 . as described in greater detail below , clicker 50 and a clutch 60 are disposed about the drive sleeve 30 , between the drive sleeve 30 and a dose dial sleeve 70 . the clicker 50 is located adjacent the second flange 34 of the drive sleeve 30 . the clicker 50 is generally cylindrical and is provided at a first end with a flexible helically extending arm 52 ( see , e . g ., fig6 ). a free end of the arm 52 is provided with a radially directed toothed member 54 . a second end of the clicker 50 is provided with a series of circumferentially directed saw teeth 56 ( fig7 ). each saw tooth comprises a longitudinally directed surface and an inclined surface . in an alternative arrangement , the clicker further includes at least one spring member . the at least one spring member assists in the resetting of the clutch 60 following dispense of a previously set amount of medicament . the clutch 60 is located adjacent the second end of the drive sleeve 30 . the clutch 60 is generally cylindrical and is provided at a first end ( a distal end ) with a series of circumferentially directed saw teeth 66 ( see , e . g ., fig7 ). each saw tooth comprises a longitudinally directed surface and an inclined surface . towards the second end 64 ( a proximal end ) of the clutch 60 there is located a radially inwardly directed flange 62 . the flange 62 of the clutch 60 is disposed between the shoulder 37 of the drive sleeve 30 and the radially outwardly directed flange 39 of the extension 38 . the second end of the clutch 60 is provided with a plurality of dog teeth 65 ( see , e . g ., fig8 ). the clutch 60 is keyed to the drive sleeve 30 by way of splines ( not shown ) to prevent relative rotation between the clutch 60 and the drive sleeve 30 . in one preferred arrangement , the clicker 50 and the clutch 60 each extend approximately half the length of the drive sleeve 30 . however , it will be understood by those of ordinary skill in the art that other arrangements regarding the relative lengths of these parts are possible . the clicker 50 and the clutch 60 are engaged as shown in fig6 and 7 , for example . a dose dial sleeve 70 is provided outside of the clicker 50 and clutch 60 and radially inward of the main housing 4 . the dose dial sleeve 70 comprises a distal end 73 and a proximal end 77 . a helical groove 74 is provided about an outer surface 72 of the dose dial sleeve 70 . the main housing 4 is provided with a window 44 through which a part of an outer surface 72 of the dose dial sleeve 70 may be viewed . the main housing 4 is further provided with a helical rib 46 , adapted to be seated in the helical groove 74 on the outer surface of the dose dial sleeve 70 . in one preferred arrangement , the helical rib 46 extends for a single sweep of the inner surface of the main housing 4 . a first stop is provided between the splines 42 and the helical rib . a second stop , disposed at an angle of 180 ″ to the first stop , is formed by a frame surrounding the window 44 in the main housing 4 . returning to fig1 - 5 , a dose dial grip 76 is disposed about an outer surface of the second end of the dose dial sleeve 70 . an outer diameter of the dose dial grip 76 preferably corresponds to the outer diameter of the main housing 4 . the dose dial grip 76 is secured to the dose dial sleeve 70 to prevent relative movement between these two components . the dose dial grip 76 is provided with a central opening 78 . an annular recess 80 located in the second end of the dose dial grip 76 extends around the opening 78 . a button of generally ‘ t ’ section is provided at a second end of the device . a stem 84 of the 85 button may extend through the opening 78 in the dose did grip 76 , through the inner diameter of the extension 38 of the drive sleeve 30 and into the receiving recess 26 at the proximal end of the piston rod 20 . the stem 84 is retained for limited axial movement in the drive sleeve 30 and against rotation with respect thereto . a head 85 of the button 82 is generally circular . a skirt 86 depends from a periphery of the head 85 . the skirt 86 is adapted to be seated in the annular 10 recess 80 of the dose dial grip 76 . operation of a right handed drug delivery device in accordance with a preferred arrangement will now be described . in fig9 , 10 and 11 arrows , a , b , c , d , e , f and g represent the respective movements of the button 82 , the dose dial grip 76 , the dose dial sleeve 70 , the drive sleeve 30 , 15 the clutch 60 , the clicker 50 and the part nut 40 in one arrangement . to dial a dose in the arrangement illustrated in fig9 , a user holds the main housing 4 in his or her left hand and uses the right hand to rotate the dose dial grip 76 ( arrow b ) in a direction away from the user . this is also shown in fig1 where the user uses his or her right hand to turn the dose dial grip 76 in the direction of arrow 120 : in a direction away from the user . with the clicker 50 and clutch 60 engaged , the drive sleeve 30 , the clicker 50 , the clutch 60 and the dose dial sleeve 70 rotate with the dose dial grip 76 towards the user . audible and tactile feedback of the dose being dialed is provided by the clicker 50 and the clutch 60 . torque is transmitted through the saw teeth 56 , 66 between the clicker 50 and the clutch 60 . the flexible arm 52 deforms and drags the toothed member 54 over the splines 42 to produce a click . preferably , the splines 42 are disposed such that each click corresponds to a conventional unit dose , or the like . the helical groove 74 on the dose dial sleeve 70 and the helical groove 38 in the drive sleeve 30 have the same lead . this allows the dose dial sleeve 70 ( arrow c ) to extend in a proximal direction away from the main housing 4 ( see , also fig1 ). in this manner , the drive sleeve 30 ( arrow d ) climbs the piston rod 20 at the same rate . at the limit of travel , a radial stop 104 ( see , e . g ., fig1 ) on the dose dial sleeve 70 engages either the first stop 100 or the second stop 102 provided on the main housing 4 to prevent further movement . rotation of the piston rod 20 is prevented due to the opposing directions of the overhauled and driven threads on the piston rod 20 . the part nut 40 , keyed to the main housing 4 , is advanced along the intermediate thread 36 by the rotation of the drive sleeve 30 ( arrow d ). a visual indication of the dose that may be dialed , for example reference numerals or a scale , may be provided on the outer surface 72 of the dose dial sleeve 70 . ( see , e . g ., fig1 and 14 ) for example , fig1 illustrates a first scale arrangement 122 that could be provided on the dose dial sleeve outer surface 72 . in the scale arrangement 122 illustrated in fig1 , the arrangement 122 comprises five ( 5 ) columns of numerals : first column 124 , second column 126 , third column 128 , fourth column 130 , and fifth column 132 . in each column , the column of numerals decrease by a factor of two as one proceeds up the column . for example , in first column 124 located on the left hand side of arrangement 122 , first column 124 begins with the reference numeral “ 80 ” and decreases by a factor of two for each other numeral provided in this column ( i . e , 80 units then 78 units then 76 units , etc .). this first scale arrangement 122 could provide a user certain visual indication through drug delivery device window 44 as the amount of dosage that a user sets . as may be seen from this first scale arrangement 122 provided in fig1 , a maximum scale reference numeral “ 80 ” 134 is provided at a bottom of the first column 124 and a minimum scale reference numeral “ 0 ” 136 is provided at the top of the fifth column 132 . with this scale arrangement 122 , the maximum settable dose by the drug delivery device 1 is “ 80 ” units 134 and the minimum settable dose is “ 0 ” units 136 . between the maximum and minimum reference numerals 124 , 136 , respectively , other doses are noted in increments of 2 : ( e . g ., 2 , 4 , 6 , 8 etc .). single unit doses and odd unit doses may also be set and these are provided by way of plurality of scale marks provided between even numbered reference numerals . for example , half scale mark (“ 1 ” units ) 138 is provided between the minimum settable dose “ 0 ” units 136 and 2 units at the top of column 132 . as may be also seen from this first scale arrangement 122 , the reference numerals increase going from a right hand side of the scale 122 or the fifth scale arrangement column 132 proceeding to the left side of scale 122 ( towards the first scale arrangement column 124 ). fig1 illustrates the scale arrangement of fig1 provided along an outer surface 72 of the dose dial sleeve 70 . as can be seen from fig1 , scale arrangement 122 has the maximum settable dose value “ 80 ” provided at the distal end 73 and the minimum settable dose value “ 0 ” provided at the proximal end 74 of the dose dial sleeve 70 . intermittent scale numerals “ 60 ” units 172 , “ 40 ” units 176 and “ 20 ” units 178 are also provided . consequently , if scale arrangement 122 were provided on the dose dial sleeve 70 illustrated in fig1 - 5 , as a user rotates the dose dial sleeve 70 by way of the dose dial grip 76 in a direction away from the user to set a dose with the user &# 39 ; s right hand as illustrated in fig9 and 15 , the dose dial sleeve 70 would extend out of the housing . for example , in fig1 , a user has set a dose of 30 units with his or her right hand . as shown in fig1 , as a user rotates the dose dial grip 76 and therefore the dose dial sleeve 70 in a direction away from the user ( this direction illustrated by arrow 120 ), the scale arrangement 122 of fig1 provided along an outer drum of the dose dial sleeve 70 and are consequently readable in an upright orientation by way of window 44 . consequently , as the user uses his or right hand to rotate this dose dial sleeve , the user will receive correct visual confirmation of at least two important items : ( 1 ) the amount of the dose viewable by way of the window 44 , and ( 2 ) other indication ( from label 112 ) that a drug delivery device provider may include on the housing . for example , label 112 could include : a description of the medicament provided in the drug delivery device , an expiration date of the medication , some type of color designation of the type of medicament provided , or some type of color designation of the type of drug delivery device provided . as just one example , the drug delivery device label 112 could provide a color indication of the type of insulin provided in the drug delivery device ( e . g ., long acting or short acting insulin ) and / or could indicate that the drug delivery device is intended for right - handed or left - handed diabetics . that is , those diabetics who tend to favor their left hand to set a dose and / or inject a dose . returning to the drug delivery device 1 illustrated in fig1 - 5 , when the final dose dispensed position ( see , e . g ., fig4 , 5 and 13 ) is reached , a radial stop 106 formed on a second surface of the part nut 40 abuts a radial stop 108 on a first surface of the second flange 34 of the drive sleeve 30 , preventing both the nut 40 and the drive sleeve 30 from rotating further . in an alternative arrangement , a first surface of the part nut 40 may be provided with a radial stop for abutment with a radial stop provided on a second surface of the first flange 32 . this aids location of the nut 40 at the cartridge full position during assembly of the drug delivery device . should a user inadvertently dial beyond a desired dosage , the drug delivery device of fig9 allows the dosage to be dialed down without dispense of medicinal product from the cartridge ( see , e . g ., fig1 ). for example , as illustrated in fig1 , a user has set a dose of 30 units . however , the user may now want to dial this dosage down without dispensing the previously set 30 unit dose . in this arrangement , in order for the user to dial down the dosage , the dose dial sleeve 70 is rotated in a direction towards the user and the dose dial grip 76 is counter rotated ( see , e . g ., arrow b in fig1 ). this causes the system to act in reverse . the flexible arm 52 preventing the clicker 50 from rotating . the torque transmitted through the clutch 60 causes the saw teeth 56 , 66 to ride over one another to create the clicks corresponding to dialed dose reduction . preferably the saw teeth 56 , 66 are so disposed that the circumferential extent of each saw tooth corresponds to a unit dose . when the desired dose has been dialed , the user may then dispense this dose by depressing the button 82 ( see , e . g ., fig1 ). as the user depresses the button 82 as illustrated in fig1 and fig1 , this displaces the clutch 60 axially with respect to the dose dial sleeve , 70 causing the dog teeth 65 to disengage . however the clutch 60 remains keyed in rotation to the drive sleeve 30 . the dose dial sleeve 70 and associated dose dial grip 76 are now free to rotate ( guided by the helical rib 46 located in helical groove 74 ). the axial movement deforms the flexible arm 52 of the clicker 50 to ensure the saw teeth 56 , 66 cannot be overhauled during dispense . this prevents the drive sleeve 30 from rotating with respect to the main housing 4 though it is still free to move axially with respect thereto . this deformation is subsequently used to urge the clicker 50 , and the clutch 60 , back along the drive sleeve 30 to restore the connection between the clutch 60 and the dose dial sleeve 70 when pressure is removed from the button 82 . the longitudinal axial movement of the drive sleeve 38 causes the piston rod 20 to rotate 5 though the opening 18 in the insert 16 , thereby to advance the piston 18 in the cartridge 8 . as can be seen from fig1 , as the user uses his or her right hand 200 to depress the button 82 , the user can monitor the dosage being dispensed by way of the scale arrangement 122 viewable via window 44 . in addition , as the user uses his or her right hand to depress the button 82 while administering the dose , other labeling 124 provided along the housing ( see , e . g ., fig1 ) may also be visible . it will be appreciated , however , that if a left handed user ( i . e ., a left handed diabetic ) were to use his or her left hand to first set a dose and then second to administer this previously set dose , neither of these events would occur . for example , fig1 illustrates what would occur if a left handed user were to set a dose the drug delivery device illustrated in fig1 - 5 . first , the left handed user would use his or her right hand to hold the drug delivery housing 4 and then turn the dose dial grip 76 with the user &# 39 ; s left hand . in this orientation , the dose dial grip 76 must be rotated towards the user to set a dose rather than away from the user as with right handed drug delivery devices . in fig1 , this is represented by the arrow 110 . in such an event , both the scale arrangement 122 provided on the dose dial sleeve 70 and the labeling 112 would be inverted : they would be upside down rather than right side up as illustrated in fig1 . therefore , for left handed users of the drug delivery device , both the scale provided on the dose dial sleeve as well as the labeling 112 must be modified so as to provide a readable scale and readable labeling for those left handed users . fig2 illustrates an alternative drug delivery device 140 wherein a dose may be selected by a left handed user by rotating the dose dial grip 144 in a direction of arrow 142 : that is , rotation of the dose dial grip 144 towards the user . in this arrangement , the user holds the housing 146 in their right hand . then , the user can use his or her left hand to set a dose via dose dial grip 142 . as the user sets the dose , an alternative scale arrangement 152 must be provided so that the user can view the scale arrangement 152 by way of the drug delivery device window 150 in a right side up orientation , rather than the inverted scale 122 illustrated with the device 1 in fig1 . to provide a viewable scale that is readable and not inverted in this configuration , a modified scale from that provided in fig1 must be provided . fig2 illustrates one arrangement of an alternative scale arrangement 152 that could be provided along an outer surface of a dose dial sleeve in drug delivery device 140 of fig2 . the general construction of the alternative arrangement of the drug delivery device 140 along with its dose setting mechanism provided in fig2 is essentially identical to the general construction and operation of the drug delivery device 1 illustrated in fig1 - 5 . however , both the alternative scale arrangement 152 and alternative labeling 148 have been modified from the scale arrangement 122 and labeling 112 of device 1 illustrated in fig2 . in this alternative configuration , when a left handed user sets a dose , both the scale 152 and label 148 may be viewed in a correct orientation : where the scale and label are right side up and not inverted . fig2 illustrates one arrangement for such a modified scale 152 . as may be seen from this alternative scale arrangement , again five columns of reference numerals are provided : a first column 160 , a second column 162 , a third column 166 , a fourth column 166 , and a fifth column 168 . as can be seen from the first scale arrangement 122 illustrated in 17 , the orientation of the five columns of the alternative scale arrangement 152 has been alternated from the scale arrangement provided in fig1 . scale arrangement 152 comprises a maximum scale reference numeral “ 80 ” 154 and a minimum scale reference numeral “ 0 ” 156 . similar to the scale arrangement provided in fig1 , the maximum scale reference numeral 154 is indicative of a maximum dose settable by the drug delivery device 140 and is “ 80 ” units . between the maximum and minimum reference numerals , other doses are noted in increments of 2 : ( e . g ., 2 , 4 , 6 , 8 etc .) again , single unit doses and odd unit doses are also provided by way of the hash marks provided between even numbered reference numerals . for example , hash mark 170 indicates a 79 unit dose , a dose between the maximum dose “ 80 ” units and a dose of 78 units . unlike the scale arrangement 122 of fig1 , however , in the alternative scale arrangement 152 , the reference numeral column containing the maximum settable dose “ 80 ” units is provided along a right hand of the scale arrangement while the minimum dose “ 0 ” units is now provided in the fifth scale arrangement column 168 provided at a left hand of the arrangement . another difference between the modified scale arrangement 152 and the scale arrangement 122 provided in fig1 is that in the modified scale arrangement 152 , the dose setting numerals increase from a bottom of a column to a top of a column . for example , in the first column 160 of scale arrangement 152 , the dose will increase from the minimum “ 0 ,” 2 , 4 , and so on . consequently , if modified scale arrangement 152 were to be provided on the dose dial sleeve of a drug delivery device 140 as illustrated in fig2 , the higher dose numerals 154 would reside along the distal end of the dose dial sleeve while the lower dose numerals would reside along a proximal end of the dose dial sleeve 70 . consequently , as a user rotates the dose dial sleeve by way of the dose dial grip 76 in a direction towards the user with the user &# 39 ; s left hand , the dose dial sleeve 70 would extend out of the housing and the scale arrangement 152 could be read from the right side up scale in viewable window 44 and would no longer be inverted as illustrated in fig1 . fig2 illustrates the scale arrangement of fig1 provided along an outer surface 72 of the dose dial sleeve 70 . as can be seen from fig1 , scale arrangement 122 has the maximum settable dose value “ 80 ” provided at the distal end 73 and the minimum settable dose value “ 0 ” provided at the proximal end 74 of the dose dial sleeve 70 . intermittent scale numerals “ 60 ” units 186 , “ 40 ” units 184 and “ 20 ” units 182 are also provided but their relative location along the outer surface 72 of the dose dial sleeve has been modified as compared to fig1 . another modification that can be made to the drug delivery device 140 of fig2 from the drug delivery device 1 illustrated in fig2 is that an orientation of label 148 has changed . now , with the drug delivery device 140 of fig2 , as a user holds the device housing 4 in their right hand and sets a dose with their left hand by turning the dose dial grip in the direction of arrow 142 , the left handed user can now view the label in a right side up manner . that is , the label 148 is no longer inverted . exemplary embodiments of the present drug delivery device have been described . those skilled in the art will understand , however , that changes and modifications may be made to these embodiments without departing from the true scope and spirit of the presently proposed drug delivery device , which is defined by the claims .
a method and system for proving a drug delivery device . the device comprises a drug delivery device housing and a medicament contained in the drug delivery device housing . a dose dial sleeve is positioned in the housing and is rotatable to set a non - inverted dose of the medicament contained in the medical delivery device . the non - inverted dose may be increased by turning the dose dial sleeve in a direction towards a user of the drug delivery device . the dose medicament may be decreased by rotating the dose dial sleeve in a direction away from the user .