Drive mechanism for a medication delivery device and medication delivery device

Patent metadata

Field	Value
Publication number	US-10493208-B2
Application number	US-201815902600-A
Country	US
Kind code	B2
Filing date	Feb 22, 2018
Priority date	Dec 12, 2008
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A drive mechanism for a medication delivery device is presented having a housing, a rotation member that rotates in a first direction with respect to the housing during setting of a dose of a medication and rotates in a second direction with respect to the housing during delivery of the dose, the second direction being opposite to the first direction. The device also has a piston rod that is displaced in a distal direction with respect to the housing for delivering the dose, a drive member which follows rotational movement of the rotation member in the second direction during delivery of the dose, and a stop member which prevents rotational movement of the drive member with respect to the housing in the first direction during setting of the dose.

First claim

The invention claimed is:

1. A resettable drive mechanism for a medication delivery device, comprising:
a housing with a proximal end and a distal end;
a drive member rotatable in a second direction with respect to the housing for delivering a dose of a medication;
a piston rod which is splined to the drive member, where rotation of the drive member in the second direction causes displacement of the piston rod in the distal direction with respect to the housing;
a stop member adapted to prevent rotation of the drive member with respect to the housing in a first direction opposite to the second direction when the stop member engages the drive member; and
a clutch member movable with respect to the housing between a delivery position and a reset position,
wherein when the clutch member is in the delivery position, the stop member and the drive member are engaged and the drive member is prevented from rotating in the first direction with respect to the housing and when the clutch member is in the reset position, the drive member and the stop member are disengaged, the drive member is rotatable in the first direction with respect to the housing and the piston rod is movable in the proximal direction with respect to the housing.

2. The resettable drive mechanism of claim 1 , wherein the piston rod is threadedly engaged with the housing.

3. The resettable drive mechanism of claim 1 , wherein there is no relative rotation between the piston rod and the drive member.

4. The resettable drive mechanism of claim 1 , wherein the clutch member is rigid and has a constant length.

5. The resettable drive mechanism of claim 1 , wherein the clutch member is secured in the drive mechanism in order to prevent the clutch member from falling out of the housing.

6. The resettable drive mechanism of claim 1 , wherein a diameter of the housing is less than or equal to 20 mm.

7. The resettable drive mechanism of claim 1 further comprising a dose member which is movable in the proximal direction with respect to the housing for setting the dose of medication and in the distal direction with respect to the housing for delivering the set dose, wherein movement of the dose member for delivering the set dose is converted into rotational movement of a rotation member with respect to the housing in the second direction.

8. The resettable drive mechanism of claim 7 , wherein the rotation member is operatively connected to the drive member to rotate the drive member in the second direction.

9. A medication delivery device, comprising the resettable drive mechanism of claim 1 , wherein the medication delivery device further comprises a clutch stop member, wherein the clutch stop member is secured to the housing when the clutch member is in the delivery position, and wherein the clutch stop member is removable from the housing in order to allow that the clutch member moves from the delivery position into the reset position.

Assignees

• Sanofi Aventis Deutschland

Inventors

• Raab Steffen
• Bruggemann Ulrich

Classifications

• A61M5/31536

  Blocking means to immobilize a selected dose, e.g. to administer equal doses · CPC title

• Y10T74/18568

  Reciprocating or oscillating to or from alternating rotary · CPC title

• A61M5/31511

  Piston or piston-rod constructions, e.g. connection of piston with piston-rod (A61M5/5066 takes precedence) · CPC title

• A61M2005/3152

  including gearings to multiply or attenuate the piston displacing force · CPC title

• A61M5/31515

  Connection of piston with piston rod · CPC title