(19)
(11)EP 1 362 326 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
15.02.2006 Bulletin 2006/07

(21)Application number: 02701421.6

(22)Date of filing:  22.02.2002
(51)Int. Cl.: 
G06M 1/04  (2006.01)
(86)International application number:
PCT/GB2002/000814
(87)International publication number:
WO 2002/067844 (06.09.2002 Gazette  2002/36)

(54)

DOSAGE COUNTING DEVICES

DOSIERZÄHLEINRICHTUNG

SYSTEME DE COMPTAGE DES DOSES


(84)Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

(30)Priority: 23.02.2001 GB 0104557

(43)Date of publication of application:
19.11.2003 Bulletin 2003/47

(73)Proprietor: Bespak plc
King's Lynn Norfolk PE30 2JJ (GB)

(72)Inventors:
  • OUYANG, Tianhong
    Chapell Hill, NC 27514 (US)
  • BRACE, Geoff
    Raleigh, NC 27613 (US)

(74)Representative: Thomson, Neil David et al
Boult Wade Tennant Verulam Gardens 70 Gray's Inn Road
London WC1X 8BT
London WC1X 8BT (GB)


(56)References cited: : 
EP-A- 1 065 477
WO-A-98/56444
US-A- 6 142 339
WO-A-95/08484
US-A- 5 228 586
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The present invention relates to counting devices for use with dose-dispensing delivery apparatus which require an axial force for operation.

    [0002] It has been recognised that there is a need to provide accurate information to the user of a dose-dispensing delivery apparatus concerning the number of doses delivered from, or remaining in, the apparatus. Without such accurate information there is the danger that a user will forget how many doses have been delivered and hence take a greater or fewer number of doses than is required. There is also the danger that a user may be unaware that the delivery apparatus is empty or close to empty. Hence, in an emergency situation, the user may seek to take a dose from the delivery apparatus only to find that there are no doses left in the apparatus. This is especially dangerous where the delivery apparatus is for use in dispensing medicinal compounds for the treatment of chronic or acute symptoms, for example, as in the case of a pressurised metered dose inhaler used for treating asthmatic reactions.

    [0003] A number of devices have been proposed to count the number of doses delivered or remaining in a delivery apparatus. WO95/08484 teaches a dose counting device for use with an aerosol medication dispenser. The device works by translating a non-rotative force on an outer cover into a rotation of an indicator wheel by use of a set of flexible pawls engaged with a set of teeth. The pawls depress and thereby extend circumferentially when the applied force forces them to effect a rotation of the teeth. This device has, however, been found to have disadvantages. The reliability of operation of the counting device depends on the relationship between the stiffness of the internal spring bias of the medication dispenser and the pawls. If the pawls are too stiff relative to the internal spring bias then the medication dispenser may dispense a dose before the pawls flex sufficiently to rotate the indicator wheel; a dose wold be delivered without the counter registering it. Alternatively, if the pawls are too flexible relative to the internal spring bias then the pawls may flex sufficiently to rotate the indicator wheel before the medication dispenser has dispensed a dose; a dose would be registered by the counter but not actually delivered.

    [0004] EP1065477 describes a dose dispenser with a device for counting the dispensed doses, wherein the dispenser comprises a base body, an operating body superimposed on the base body, a first discoidal body housed in and rotable within the operating body, and wherein flexible tangs projecting on the first discoidal body cause the first discoidal body to rotate one step each time the operating body is moved axially relative to the base body.

    [0005] The present invention seeks to provide a dosage counting device which overcomes these problems.

    [0006] Accordingly the present invention provides apparatus comprising a housing defining a portion for receiving in use a dose-dispensing container, the housing containing a dose counter comprising at least one annular counter member and characterised by a helix-like coil, wherein one or more projections are provided on the helix-like coil for operatively connecting the helix-like coil and the at least one annular counter member, wherein axial movement of the received dose-dispensing container acts to compress the helix-like coil to thereby rotate the helix-like coil wherein each of the at least one annular counter members comprise a first series of teeth, the projections of the helix-like coil being selectively engagable with each of the first series of teeth such that rotational movement of the helix-like coil causes the at least one annular counter member to rotate relative to the housing in a first direction.

    [0007] An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

    Figure 1 is a cross-sectional view of a dispensing apparatus according to the present invention; and

    Figure 2 is an exploded perspective view of part of the dispensing apparatus of Figure 1.



    [0008] In the following description, the invention will be illustrated, by way of example only, with respect to a pressurised dispensing container capable of delivering successive doses of a product in an aerosol form.

    [0009] Figures 1 and 2 illustrate a dispensing apparatus according to the present invention.

    [0010] The dispensing apparatus comprises a housing 1 having a cylindrical portion 2 with upper and lower ends. The upper end 6 is open whilst the lower end is closed off by a basal wall portion 7. A mouthpiece 3 which communicates with the cylindrical portion 2, depends laterally from the lower end of the cylindrical portion 2. The mouthpiece 3 defines an outlet duct 4 which terminates in an outlet 5 of the mouthpiece 3.

    [0011] An inwardly directed valve stem receiving block 9 is integrally formed with the basal wall portion 7 and has its longitudinal axis aligned co-axially with a longitudinal axis of the cylindrical portion 2 of the housing 1. The valve stem receiving block 9 defines a receiving bore 12 which is open to the cylindrical portion 2 and an orifice 10 which is open to the outlet duct 4 of the mouthpiece 3. The receiving bore 12 and orifice 10 are linked by a duct 11.

    [0012] Several, preferably six circumferentially spaced inwardly directed longitudinal ribs 14 are provided on the internal wall of the cylindrical portion 2.

    [0013] In use a pressurised dispensing container 20 is received in the cylindrical portion 2. The pressurised dispensing container 20 comprises a canister body 21 defining a storage chamber for housing the product to be dispensed. The canister body 21 is closed off at one end by a metering valve (not shown) having a valve stem 22 which extends externally from the metering valve. The metering valve is retained in the canister body by a crimped ferrule 23.

    [0014] When the pressurised dispensing container 20 is inserted into the housing 1, the valve stem 22 is received in receiving bore 12 of the valve stem receiving block 9. An annular air gap 13 exists between the internal wall of the cylindrical portion 2 and the canister body 21 to allow air to flow through the dispensing apparatus in use.

    [0015] According to the present invention a dosage counter is provided comprising first and second indicator wheels 241, 242, a helical coil 243 and support 246. The first and second indicator wheels 241, 242 comprise indicia 247 marked on their peripheral walls. The first indicator wheel 241 denotes numerical 'units' and the second indicator wheel 242 denotes numerical 'tens'. Each indicator wheel 241, 242 is annular.

    [0016] The upper rim of the first indicator wheel 241 is formed into a series of teeth which will be denoted as the upper teeth 248 of the first indicator wheel 241. In addition, the first indicator wheel 241 comprises a series of internal teeth 249 arranged around a lower portion of the internal rim of the annulus. The first indicator wheel 241 also comprises three evenly distributed radial notches 250 on the upper half of the internal rim of the annulus. Alternatively, two or more than three notches 250 may be provided.

    [0017] The lower rim of the second indicator wheel 242 is formed into a series of teeth which will be denoted as the lower teeth 270 of the second indicator wheel 242. The upper rim of the second indicator wheel 242 is formed into a series of teeth which will be denoted as the upper teeth 251 of the second indicator wheel 242. In addition, the second indicator wheel 242 comprises a series of internal teeth 252 arranged around a lower portion of the internal rim of the annulus.

    [0018] The support 246 comprises an annular portion 262 from which depends an annular flange 263 whose lower face is formed into a series of teeth which will be denoted as the lower teeth 264 of the support 246.

    [0019] The helical coil 243 comprises an upper ring 253 and a lower ring 254 which are interconnected by two flexible helical struts 256. The lower ring 254 comprises four equi-spaced radially outwardly directed protrusions 255. The upper ring 253 is provided with at least one pair of upper and lower arms 260, 259 extending upwardly therefrom. Each arm is provided with a laterally dependent finger portion forming a pawl which selectively engages the internal teeth 249, 252 of the first and second indicator wheels 241, 242 as described below. Two vertical struts 257 depend from the upper ring 253 and extend partially towards the lower ring 254.

    [0020] The first and second indicator wheels 241, 242, helical coil 243 and support 246 are assembled within a cap 269. The cap 269 is generally cylindrical in shape and is closed off at an upper end. A window 8 is formed in a side wall near the upper end. Four longitudinally directed recesses 261 are formed equi-spaced around the internal surface of the cap 269. An annular inwardly directed rim 273 is provided near the open end of the cap 269.

    [0021] The dosage counter is assembled by first inserting the support 246 into the cap 269. The support 246 forms a push-fit with the internal wall of the cap 269. The second indicator wheel 242, first indicator wheel 241 and helical coil 243 are then inserted into the cap 269 in that order. The four protrusions 255 of the lower ring 254 are received in the longitudinal recesses 261 of the cap 269. The components of the dosage counter are retained within the cap 269 by the interference of the lower ring 254 of the helical coil 243 and the annular rim 273 of the cap 269.

    [0022] In the assembled position, the fingers 290 of the lower arms 259 of are aligned with the internal teeth 249 of the first indicator wheel 241. The fingers 291 of the upper arms 260 are partially aligned with the internal teeth 252 of the second indicator wheel 242 and partially aligned with the upper half of the internal rim of the first indicator wheel 241. Hence, the fingers 290 of the lower arms 259 are always engaged with the internal teeth 249 of the first indicator wheel 241 but the fingers 291 of the upper arms 260 are normally held out of engagement with the internal teeth 252 of the second indicator wheel 242 due to the presence of the internal rim of the first indicator wheel 241.

    [0023] The pressurised dispensing container 20 is received in the housing 1. The cap 269 is then placed over the upper end of the pressurised dispensing container 20. A tubular extension 274 is provided within the cap 269 into which the canister body 21 forms a push-fit so as to retain the cap 269 in engagement with the housing 1. With the cap 269 engaged with the housing 1, the lower ring 254 abuts and rests on the upper end 6 of the cylindrical portion 2 of the housing 1 against the upper rim 300.

    [0024] In use, a user operates the pressurised dispensing container 21 by depressing the closed end of cap 269 axially to move it and the canister body 21 relative to the cylindrical portion 2 of the housing 1. As a result, the valve stem 22 is inwardly retracted relative to the metering valve such that a dose of product is dispensed from the valve stem 22 into the bore 12 and duct 11 of the valve stem receiving block 9. The product is then channelled by duct 11 and dispensed as an aerosol through orifice 10 into the outlet duct 4. The aerosol is inhaled by a user inhaling on outlet 5 of the mouthpiece 3. The support 246 is a push-fit within the cap 269 and therefore does not move axially during a normal operating cycle. Axial movement of the cap 269 causes the lower ring 254 to be compressed towards the upper ring 253 of the helical coil 243. At the same time, due to the helical struts 256, the upper ring 253 rotates relative to the lower ring 254 which cannot rotate relative to the cap 269 due to the engagement of the protrusions 256 in the longitudinal recesses 261.

    [0025] As the upper ring 253 rotates, the first indicator wheel 241 is incrementally rotated due to engagement of the fingers 290 of the lower arms 259 with the internal teeth 249.

    [0026] The degree of axial movement of the upper ring 253 relative to the lower ring 254 is limited by the vertical struts 257 which ground against the lower ring 254.

    [0027] After successive rotations of the first indicator wheel 241 the fingers 291 of the upper arms 260 are brought into alignment with the radial notches 250 of the first indicator wheel 241. As a consequence, the fingers 291 of the upper arms 160 can flex radially outwards so as to engage the internal teeth 252 of the second indicator wheel 242. Consequently, the second indicator wheel 242 rotates one increment on the next actuation of the metering valve. In this way, the 'tens' indicia can be incremented once for every ten increments of the 'units' indicia.

    [0028] On release of the canister body 21 by the user, the pressurised dispensing container 20 returns to its rest position as described above. At the same time, the helical coil 243 recovers to its original shape. The angling of the fingers 290, 291 of the upper and lower arms 260, 259, and the teeth of the support 246 and first and second indicator wheels 241, 242 prevents any reverse movement of the indicator wheels 241, 242 during this part of the operating cycle.

    [0029] The dosage counter is 'set' in the cap 269 on the first actuation as follows:

    [0030] The support 246 is assembled in the cap 269 at a point below its normal operating position, i.e., nearer the open end of the cap than shown in Figure 1.

    [0031] Consequently, the first and second indicator wheels 241, 242 and helical coil 243 are all also nearer the open end than their normal operating positions. On the first actuation, which may be undertaken by the user or at the point of manufacture or sale, the upper rim 300 at the upper end 6 of the housing 1 initially compresses the helical coil 243 without moving the support 246. Once the helical coil 243 has been compressed such that the vertical struts 257 have contacted the lower ring 254 (during which movement the metering valve is actuated), the user, pharmacist or manufacturer applies a higher axial force to the cap 269 to move both the helical coil 243 and support 246 axially relative to the cap 269 until the retracted valve stem 22 'grounds' against the base of the receiving bore 12 of the valve stem receiving block 9. The support 246 is now in its normal operating position and is 'set'. The setting of the support 246 takes into account any variations in distance between the upper rim 300 at the upper end 6 of the housing 1 and the end of the valve stem 22. Without this feature, it is possible for variations in pressurised dispensing containers to mean that in certain circumstances, the metering valve may be actuated before the first indicator wheel 241 rotates or vice versa.


    Claims

    1. Apparatus comprising a housing (1) defining a portion (2) for receiving in use a dose-dispensing container (20), the housing containing a dose counter comprising at least one annular counter member (24) and characterised by a helix-like coil (243), wherein one or more projections (290) are provided on the helix-like coil for operatively connecting the helix-like coil and the at least one annular counter member, wherein axial movement of the received dose-dispensing container acts to compress the helix-like coil to thereby rotate the helix-like coil wherein each of the at least one annular counter members (241) comprise a first series of teeth (249), the projections (290) of the helix-like coil being selectively engagable with each of the first series of teeth such that rotational movement of the helix-like coil causes the at least one annular counter member (241) to rotate relative to the housing in a first direction.
     
    2. Apparatus as claimed in claim 1 wherein the helix-like coil (243) comprises an upper ring (253), a lower ring (254) and at least one strut (256) spanning between the upper and lower rings.
     
    3. Apparatus as claimed in claim 2 wherein the at least one strut (256) is helically shaped.
     
    4. Apparatus as claimed in claim 2 or claim 3 wherein one of the upper or lower rings (253, 254) of the helix-like coil (243) comprises one or more projections (257) orientated towards the other of the upper or lower rings to thereby limit the movement of the upper and lower rings towards one another.
     
    5. Apparatus as claimed in claim 1 wherein the first series of teeth (249) are formed around an inner rim of the at least one annular counter members (241).
     
    6. Apparatus as claimed in any preceding claim wherein the dose counter comprises two or more annular counter members (241, 242).
     
    7. Apparatus as claimed in any preceding claim wherein the housing comprises a cap (269).
     
    8. Apparatus as claimed in claim 7 further comprising a support (246) slidably received in the cap (269) to support the at least one annular counter member and helix-like coil in proper alignment.
     
    9. Apparatus as claimed in claim 7 or claim 8 wherein the lower ring (254) of the helix-like coil contacts an upper end (300) of the dose-dispensing container receiving portion (2) of the housing.
     
    10. Apparatus as claimed in claim 8 or claim 9 wherein a surface of the support (246) is formed into a series of teeth (264) engagable with a second series of teeth (251) formed on the second annular counter member (242), so as to prevent rotation of the annular counter members in a direction opposed to the first direction.
     
    11. Apparatus as claimed in any of claims 5 to 10 wherein the helix-like coil comprises at least one ratchet engagable with the first series of teeth (249, 252) formed on each of the annular counter members (241, 242), so as to prevent rotation of the annular counter members in a direction opposed to the first direction.
     
    12. Apparatus as claimed in claim 11 wherein a bearing surface is provided forming at least part of the inner rim of the first annular counting member to selectively hold the projections (290, 291) out of engagement with the first series of teeth (252) of the second annular counter member (242), the bearing surface comprising at least one indent (250) allowing movement of the projections (290, 291) radially outwardly into engagement with the first series of teeth (252) of the second annular counter member after a pre-determined number of incremental rotations of the first annular counter member (241).
     
    13. Apparatus as claimed in any of claims 6 to 12 wherein the first annular counter member (241) is driven to incrementally rotate in the first direction on each actuation of the received dose-dispensing container (20) and the second annular counter member (242) is driven to incrementally rotate in the first direction only after a pre-determined number of incremental rotations of the first annular counter member (241).
     
    14. Apparatus as claimed in any preceding claim further comprising a support (246) for supporting the at least one annular counter member (241) and helix-like coil (243) in proper alignment with the received dose-dispensing container (20), wherein the support is an interference fit in a cap (269) of the housing such that a first actuation of the received dose-dispensing container sets the position of the support relative to the received dose-dispensing container and cap.
     


    Ansprüche

    1. Vorrichtung, umfassend ein Gehäuse (1), welches einen Abschnitt (2) zur Aufnahme eines Dosis-ausgebenden Behälters (20) im Betrieb definiert, wobei das Gehäuse einen Dosiszähler enthält, welcher wenigstens ein ringförmiges Zählerelement (24) umfasst und welches gekennzeichnet ist durch eine wendelartige Spule (243), wobei ein oder mehrere Vorsprünge (290) an der wendelartigen Spule zum betriebsmäßigen Verbinden der wendelartigen Spule und des wenigstens einen ringförmigen Zählerelement vorgesehen sind, wobei eine axiale Bewegung des aufgenommenen Dosis-ausgebenden Behälters derart wirkt, dass sie die wendelartige Spule zusammendrückt, um dadurch die wendelartige Spule zu drehen, wobei jedes des wenigstens einen ringförmigen Zählerelements (241) eine erste Reihe von Zähnen (249) umfasst, wobei die Vorsprünge (290) der wendelartigen Spule selektiv derart in Eingriff mit jedem der ersten Reihe von Zähnen in Eingriff bringbar sind, dass eine Drehbewebung der wendelartigen Spule bewirkt, dass das wenigstens eine ringförmige Zählerelement (241) relativ zu dem Gehäuse in einer ersten Richtung dreht.
     
    2. Vorrichtung nach Anspruch 1, wobei die wendelartige Spule (243) einen oberen Ring (253), einen unteren Ring (254) und wenigstens eine Strebe (256) umfasst, welche sich zwischen dem oberen und dem unteren Ring erstreckt.
     
    3. Vorrichtung nach Anspruch 2, wobei die wenigstens eine Strebe (256) wendelförmig ist.
     
    4. Vorrichtung nach Anspruch 2 oder 3, wobei ein Ring des oberen oder des unteren Rings (253, 254) der wendelartigen Spule (243) einen oder mehrere Vorsprünge (257) umfasst, welche zu dem anderen Ring des oberen oder des unteren Rings ausgerichtet ist, um dadurch die Bewegung des oberen und des unteren Rings aufeinander zu zu begrenzen.
     
    5. Vorrichtung nach Anspruch 1, wobei die erste Reihe von Zähnen (249) um einen inneren Rand des wenigstens einen ringförmigen Zählerelements (241) ausgebildet ist.
     
    6. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei der Dosiszähler zwei oder mehr ringförmige Zählerelemente (241, 242) umfasst.
     
    7. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei das Gehäuse eine Kappe (269) umfasst.
     
    8. Vorrichtung nach Anspruch 7, weiterhin eine Lagerung (246) umfassend, welche verschiebbar in der Kappe (269) aufgenommen ist, um das wenigstens eine ringförmige Zählerelement und die wendelartige Spule in einer richtigen Ausrichtung zu lagern.
     
    9. Vorrichtung nach Anspruch 7 oder Anspruch 8, wobei der untere Ring (254) der wendelartigen Spule ein oberes Ende (300) des Dosisausgabebehälter-Aufnahmeabschnitts (2) des Gehäuses berührt.
     
    10. Vorrichtung nach Anspruch 8 oder 9, wobei eine Fläche der Lagerung (246) als eine Reihe von Zähnen (264) ausgebildet ist, welche mit einer zweiten Reihe von Zähnen (251) in Eingriff bringbar ist, die an dem zweiten ringförmigen Zählerelement (242) ausgebildet ist, um eine Drehung der ringförmigen Zählerelemente in einer der ersten Richtung entgegengesetzten Richtung zu verhindern.
     
    11. Vorrichtung nach einem der Ansprüche 5 bis 10, wobei die wendelartige Spule wenigstens ein Klinkenrad umfasst, welches mit der ersten Reihe von Zähnen (249, 252) in Eingriff bringbar ist, die auf jedem der ringförmigen Zählerelemente (241, 242) ausgebildet ist, um eine Drehung der ringförmigen Zählerelemente in einer der ersten Richtung entgegengesetzten Richtung zu verhindern.
     
    12. Vorrichtung nach Anspruch 11, wobei eine Lagerfläche bereitgestellt ist, welche wenigstens einen Teil des inneren Randes des ersten ringförmigen Zählerelements bildet, um die Vorsprünge (290, 291) außer Eingriff mit der ersten Reihe von Zähnen (252) des zweiten ringförmigen Zählerelements (242) selektiv zu halten, wobei die Lagerfläche wenigstens eine Zahnung (250) umfasst, welche eine Bewegung der Vorsprünge (290, 291) radial nach außen in Eingriff mit der ersten Reihe von Zähnen (252) des zweiten ringförmigen Zählerelements nach einer vorbestimmten Anzahl von inkrementalen Drehungen des ersten ringförmigen Zählerelements (241) gestattet.
     
    13. Vorrichtung nach einem der Ansprüche 6 bis 12, wobei das erste ringförmige Zählerelement (241) bei jeder Betätigung des aufgenommenen Dosis-ausgebenden Behälters (20) zur inkrementalen Drehung in der ersten Richtung angetrieben wird, und wobei das zweite ringförmige Zählerelement (242) nur nach einer vorbestimmten Anzahl von inkrementalen Drehungen des ersten ringförmigen Zählerelements (241) zur inkrementalen Drehung in der ersten Richtung angetrieben wird.
     
    14. Vorrichtung nach einem der vorangehenden Ansprüche, weiterhin umfassend: eine Lagerung (246) zum Lagern des wenigstens einen ringförmigen Zählerelementes (241) und der wendelartigen Spule (243) in einer richtigen Ausrichtung mit dem aufgenommenen Dosis-ausgebenden Behälter (20), wobei die Lagerung eine Interferenzanbringung in einer Kappe (269) des Gehäuses ist, sodass eine erste Betätigung des aufgenommenen Dosis-ausgebenden Behälters die Position der Lagerung relativ zu dem aufgenommenen Dosis-ausgebenden Behälter und der Kappe einstellt.
     


    Revendications

    1. Appareil comprenant un boîtier (1) définissant une portion (2) pour recevoir, à l'utilisation, un récipient de distribution de doses (20), le boîtier contenant un compteur de doses comprenant au moins un élément de compteur annulaire (24) et caractérisé par une bobine de type hélice (243), dans lequel une ou plusieurs saillies (290) sont situées sur la bobine de type hélice pour relier fonctionnellement la bobine de type hélice et l'au moins un élément de compteur annulaire, dans lequel le déplacement axial du récipient de distribution de doses reçu sert à comprimer la bobine de type hélice afin de faire tourner la bobine de type hélice, dans lequel chaque au moins un élément de compteur annulaire (241) comprend une première série de dents (249), les saillies (290) de la bobine de type hélice étant engageables sélectivement avec chaque dent de la première série de dents de manière que le mouvement rotatif de la bobine de type hélice amène l'au moins un élément de compteur annulaire (241) à tourner par rapport au boîtier dans une première direction.
     
    2. Appareil selon la revendication 1, dans lequel la bobine de type hélice (243) comprend un anneau supérieur (253), un anneau inférieur (254) et au moins une entretoise (256) s'étendant entre les anneaux supérieur et inférieur.
     
    3. Appareil selon la revendication 2, dans lequel l'au moins une entretoise (256) est en forme d'hélice.
     
    4. Appareil selon la revendication 2 ou la revendication 3, dans lequel l'un des anneaux supérieur ou inférieur (253, 254) de la bobine de type hélice (243) comprend une ou plusieurs saillies (257) orientées vers l'autre des anneaux supérieur ou inférieur afin de limiter le déplacement des anneaux supérieur et inférieur l'un vers l'autre.
     
    5. Appareil selon la revendication 1, dans lequel la première série de dents (249) est formée autour d'une bordure interne de l'au moins un élément de compteur annulaire (241).
     
    6. Appareil selon l'une quelconque des revendications précédentes, dans lequel le compteur de doses comprend au moins deux éléments de compteur annulaires (241, 242).
     
    7. Appareil selon l'une quelconque des revendications précédentes, dans lequel le boîtier comprend un capuchon (269).
     
    8. Appareil selon la revendication 7, comprenant, en outre, un support (246) reçu par coulissement dans le capuchon (269) pour supporter l'au moins un élément de compteur annulaire et la bobine de type hélice en un alignement approprié.
     
    9. Appareil selon la revendication 7 ou la revendication 8, dans lequel l'anneau inférieur (254) de la bobine de type hélice contacte une extrémité supérieure (300) de la portion réceptrice de récipient de distribution de doses (2) du boîtier.
     
    10. Appareil selon la revendication 8 ou la revendication 9, dans lequel une surface du support (246) est formée en une série de dents (264) engageable avec une deuxième série de dents (251) formée sur le deuxième élément de compteur annulaire (242), afin d'empêcher une rotation des éléments de compteur annulaires dans une direction à l'opposé de la première direction.
     
    11. Appareil selon l'une quelconque des revendications 5 à 10, dans lequel la bobine de type hélice comprend au moins un rochet engageable avec la première série de dents (249, 252) formée sur chacun des éléments de compteur annulaires (241, 242), afin d'empêcher une rotation des éléments de compteur annulaires dans une direction à l'opposé de la première direction.
     
    12. Appareil selon la revendication 11, dans lequel une surface porteuse est prévue, formant au moins une partie de la bordure interne du premier élément de compteur annulaire afin de maintenir sélectivement les saillies (290, 291) dégagées de la première série de dents (252) du deuxième élément de compteur annulaire (242), la surface porteuse comprenant au moins une encoche (250) permettant le déplacement des saillies (290, 291) radialement vers l'extérieur en engagement avec la première série de dents (252) du deuxième élément de compteur annulaire après un nombre prédéterminé de rotations incrémentielles du premier élément de compteur annulaire (241).
     
    13. Appareil selon l'une quelconque des revendications 6 à 12, dans lequel le premier élément de compteur annulaire (241) est entraîné pour tourner de façon incrémentielle dans la première direction à chaque actionnement du récipient de distribution de doses reçu (20) et le deuxième élément de compteur annulaire (242) est entraîné pour tourner de façon incrémentielle dans la première direction uniquement après un nombre prédéterminé de rotations incrémentielles du premier élément de compteur annulaire (241).
     
    14. Appareil selon l'une quelconque des revendications précédentes, comprenant, en outre, un support (246) pour supporter l'au moins un élément de compteur annulaire (241) et la bobine de type hélice (243) en un alignement approprié avec le récipient de distribution de doses reçu (20), dans lequel le support est un ajustement serré dans un capuchon (269) du boîtier de manière qu'un premier actionnement du récipient de distribution de doses reçu règle la position du support par rapport au récipient de distribution de doses reçu et au capuchon.
     




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