Resettable drive mechanism for a drug delivery device with guide track and blocking means
First Claim
1. A resettable drive mechanism for a drug delivery device comprising a piston rod assembly, the piston rod assembly comprising:
- a guide track running along the piston rod assembly, the guide track comprising at least one delivery section and at least one reset section, the at least one reset section being arranged to continue the at least one delivery section, the at least one delivery section comprising at least one blocking means, andan interaction member, the interaction member being configured to cooperate with the guide track,wherein, for delivering a dose of a drug,(i) the piston rod assembly is axially displaceable in a dose delivery direction away from an axial starting position,(ii) the interaction member cooperates with the at least one delivery section, and(iii) the blocking means beginning at a position proximal to the interaction member and moving distally thereby passing the interaction member to a position distal of the interaction member when the piston rod assembly is displaced in the dose delivery direction,wherein axial displacement of the piston rod assembly towards the axial starting position is prevented by mechanical interaction of the blocking means and the interaction member when the interaction member cooperates with the at least one delivery section, andwherein, for resetting the drug delivery device,(i) the interaction member is configured to cooperate with the at least one reset section,(ii) the piston rod assembly is axially displaced towards the axial starting position, and(iii) the blocking means is offset from the interaction member and passing the interaction member when the piston rod assembly is axially displaced towards the axial starting position.
1 Assignment
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Accused Products
Abstract
A resettable drive mechanism for a drug delivery device (1) comprises a piston rod assembly (32) and an interaction member (23). The piston rod assembly (32) comprises a guide track (18) running along the piston rod assembly (32), the guide track (18) comprising at least one delivery section (18A) and at least one reset section (18B). The reset section (18B) is arranged to continue the delivery section (18A). The delivery section (18A) comprises at least one blocking means (19). The interaction member (23) is configured to cooperate with the guide track (18). For delivering a dose of a drug (24), the piston rod assembly (32) is axially displaceable in a dose delivery direction away from an axial starting position, the interaction member (23) cooperating with the delivery section (18A) and the blocking means (19) passing the interaction member (23) when the piston rod assembly (32) is displaced in the dose delivery direction. Axial displacement of the piston rod assembly (32) towards the axial starting position is prevented by mechanical interaction of the blocking means (19) and the interaction member (23) when the interaction member (23) cooperates with the delivery section (18A). For resetting the drug delivery device (1), the interaction member (23) is configured to cooperate with the reset section (18B), the piston rod assembly (32) being axially displaced towards the axial starting position, the blocking means (19) being offset from the interaction member (23) and passing the axial position of the interaction member (23) when the piston rod assembly (32) is axially displaced towards the axial starting position. Also, a piston rod assembly (32) is proposed.
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Citations
16 Claims
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1. A resettable drive mechanism for a drug delivery device comprising a piston rod assembly, the piston rod assembly comprising:
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a guide track running along the piston rod assembly, the guide track comprising at least one delivery section and at least one reset section, the at least one reset section being arranged to continue the at least one delivery section, the at least one delivery section comprising at least one blocking means, and an interaction member, the interaction member being configured to cooperate with the guide track, wherein, for delivering a dose of a drug, (i) the piston rod assembly is axially displaceable in a dose delivery direction away from an axial starting position, (ii) the interaction member cooperates with the at least one delivery section, and (iii) the blocking means beginning at a position proximal to the interaction member and moving distally thereby passing the interaction member to a position distal of the interaction member when the piston rod assembly is displaced in the dose delivery direction, wherein axial displacement of the piston rod assembly towards the axial starting position is prevented by mechanical interaction of the blocking means and the interaction member when the interaction member cooperates with the at least one delivery section, and wherein, for resetting the drug delivery device, (i) the interaction member is configured to cooperate with the at least one reset section, (ii) the piston rod assembly is axially displaced towards the axial starting position, and (iii) the blocking means is offset from the interaction member and passing the interaction member when the piston rod assembly is axially displaced towards the axial starting position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification