TH50378B - Improvements in drive mechanisms and in relation to drive mechanisms suitable for use in dispensing devices. - Google Patents

Abstract

DC60 (31/05/47) This invention relates to a drive mechanism for use in a drug dispensing device comprising a housing with internal and external threads, a connecting rod with a non-circular cross-section which is threaded to the internal threads of the housing, a unidirectional coupling arranged between the housing and the connecting rod, a dose-regulating cylinder which is threaded to the external threads of the housing and which can rotate in accordance with the housing, a driving cylinder arranged between the housing and the connecting rod which can move axially but not rotate in accordance with the connecting rod, and a clutch path arranged between the dose-regulating cylinder and the driving cylinder which a) when the dose-regulating cylinder and the driving cylinder are disengaged by such clutch path, allows the dose-regulating cylinder to rotate in accordance with the driving cylinder, and b) when the dose-regulating cylinder and the driving cylinder are coupled The clutch actuation mechanism is intended to prevent the rotation of the dose-adjusting swivel cylinder corresponding to the drive cylinder. This invention relates to a drive mechanism for use in a drug dispensing device comprising a housing with internal and external threads, a connecting rod with a non-circular cross-section which is threaded to the internal threads of the housing, a unidirectional coupling arranged between the housing and the connecting rod, a dose-adjusting swivel cylinder which is threaded to the external threads of the housing and which can rotate in accordance with the housing, a driving cylinder positioned between the housing and the connecting rod which can move axially but cannot rotate in accordance with the connecting rod, and a clutch actuation mechanism arranged between the dose-adjusting swivel cylinder and the drive cylinder which a) when the dose-adjusting swivel cylinder and the drive cylinder are disengaged by the clutch actuation mechanism, it allows the rotation of the dose-adjusting swivel cylinder. a) when the dose-adjusting cylinder is rotated and the drive cylinder is coupled by such a clutch means that it will prevent the rotation of the dose-adjusting cylinder corresponding to the drive cylinder.

Claims (10)

1. The drive mechanism for use in a dispensing device comprises: a housing (2,2' 14,14'14''') with internal (26) and external (52,52') threads; a connecting rod (32,32') with a non-circular cross-section, which is threaded to the internal (26) thread of the housing; a unidirectional coupling (40) positioned between the housing (2,14) and the connecting rod (32,32'); a dose adjustment rotating cylinder (50,50'50''), which is threaded to the external (52,52) thread of the housing (2,2'14,14',14''') and is rotatable relative to the housing (2,2',14,14',14'''); and a drive cylinder (60,60'60'''), positioned between the housing. (2,2',14,14',14''') and the connecting rod (32,32'), which can move axially but cannot rotate relative to the connecting rod (32,32'), and the clutch path is positioned between the drive cylinder (60,60,60''') and the dosing adjustment cylinder (50,50',50'''), where (a) when the dosing adjustment cylinder (50,50',50''') and the drive cylinder (60,60',60''') are coupled by the said clutch path, the rotation of the said dosing adjustment cylinder (50,50',50''') relative to the said drive cylinder (60,60',60''') is allowed; and (b) when the dosing adjustment cylinder (50,50',50''') and the drive cylinder (60,60',60''') will be coupled by the aforementioned clutch route, the rotation of the dose adjustment cylinder (50,50',50''') relative to the drive cylinder (60,60',60''') will be prevented. 2. An assembly for use in a drug dispensing device incorporating a drive mechanism as defined in Claim 1. 3. A drug dispensing device incorporating a drive mechanism as defined in Claim 1 or the assembly of Claim 2. 4. A dispensing device pursuant to claim clause 3, which is a pen-type device. 5. A drug dispensing device as defined in any one of the claims under claims 3 to 4, which is an injectable device. 6. A dispensing device as provided for under any one of the claims in Claims 3 through 5, which may include a needle. 7. A dispensing device that meets any of the claims under Claims 3 through 5, which is a needle-free device. 8. The use of dispensing devices as defined in any one of the claims in Claims 3 through 7 for the dispensing of pharmaceutical products. 9. Use of dispensing devices under claim 8 for dispensing formulations of medicines containing an active compound selected from a group comprising insulin, growth hormone, low molecular weight heparin, derivatives or similar substances of these substances. 10. Methods of manufacturing or assembling a drug dispensing device that include procedures for providing a mechanism as defined in Claim 1 or an assembly as defined in Claim 2.