Medicament delivery device
First Claim
1. A medicament delivery device, comprising:
- a housing configured for a medicament container;
a drive unit in the housing and configured for acting on a movable stopper in the medicament container for expelling a dose of medicament, wherein the drive unit includes an elongated plunger rod and a dual back-to-back force spring assembly operatively connected to the plunger rod so as to provide a symmetrical load on the plunger rod; and
a lock and release mechanism operatively connected to the drive unit and configured for releasing the drive unit upon activation, wherein the lock and release mechanism includes a hold member operatively connected to the plunger rod, a rotator member operatively connected to the hold member, and a tubular actuation member linearly slidable in relation to the housing and operatively connected to the rotator member;
wherein the hold member is fixedly attached to the housing and includes a generally tubular lock tube through which the plunger rod extends and two half-cylindrical seats open toward a proximal direction for housing the dual back-to-back force spring assembly;
the lock tube includes a resilient lock and release device configured to interact with both the plunger rod and the rotator member; and
the resilient lock and release device includes two oppositely positioned radial flexible tongues, each with a first radial inwardly directed protrusion and with a first radial outwardly directed protrusion.
1 Assignment
0 Petitions
Accused Products
Abstract
A medicament delivery device has a housing for a medicament container and a drive unit for a stopper in the container to expel a dose of medicament, the drive unit having a plunger rod and a dual back-to-back force spring assembly connected to the plunger rod; and a lock and release mechanism connected to the drive unit that has a hold member connected to the plunger rod, a rotator member connected to the hold member, and a tubular actuation member linearly slidable in relation to the housing and connected to the rotator member. The hold member is attached to the housing and has a generally tubular lock tube through which the plunger rod extends and two half-cylindrical seats for the dual back-to-back force spring assembly. The lock tube has a resilient lock and release device to interact with both the plunger rod and the rotator member.
17 Citations
15 Claims
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1. A medicament delivery device, comprising:
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a housing configured for a medicament container; a drive unit in the housing and configured for acting on a movable stopper in the medicament container for expelling a dose of medicament, wherein the drive unit includes an elongated plunger rod and a dual back-to-back force spring assembly operatively connected to the plunger rod so as to provide a symmetrical load on the plunger rod; and a lock and release mechanism operatively connected to the drive unit and configured for releasing the drive unit upon activation, wherein the lock and release mechanism includes a hold member operatively connected to the plunger rod, a rotator member operatively connected to the hold member, and a tubular actuation member linearly slidable in relation to the housing and operatively connected to the rotator member; wherein the hold member is fixedly attached to the housing and includes a generally tubular lock tube through which the plunger rod extends and two half-cylindrical seats open toward a proximal direction for housing the dual back-to-back force spring assembly;
the lock tube includes a resilient lock and release device configured to interact with both the plunger rod and the rotator member; and
the resilient lock and release device includes two oppositely positioned radial flexible tongues, each with a first radial inwardly directed protrusion and with a first radial outwardly directed protrusion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A medicament delivery device, comprising:
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a housing configured for a medicament container; a drive unit in the housing and configured for acting on a movable stopper in the medicament container for expelling a dose of medicament, wherein the drive unit includes an elongated plunger rod and a dual back-to-back force spring assembly operatively connected to the plunger rod so as to provide a symmetrical load on the plunger rod; and a lock and release mechanism operatively connected to the drive unit and configured for releasing the drive unit upon activation, wherein the lock and release mechanism includes a hold member operatively connected to the plunger rod, a rotator member operatively connected to the hold member, and a tubular actuation member linearly slidable in relation to the housing and operatively connected to the rotator member; wherein the hold member is fixedly attached to the housing and includes a generally tubular lock tube through which the plunger rod extends and two half-cylindrical seats open toward a proximal direction for housing the dual back-to-back force spring assembly;
the lock tube includes a resilient lock and release device configured to interact with both the plunger rod and the rotator member;
the dual back-to-back force spring assembly includes two springs each of strip material having a front side surface and a back side surface and pre-tensioned into a tightly wound roll with an outer end;
each roll is cradled in a corresponding seat of the hold member;
each outer end has its back side surface toward the other outer end and attached to a respective side of a transversal post attached to a distal end of the plunger rod; and
the resilient lock and release device includes two oppositely positioned radial flexible tongues, each with a first radial inwardly directed protrusion and with a first radial outwardly directed protrusion. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification