Automatic injection device with reset feature
AssigneeNovo Nordisk A/S
InventorChristian Enggaard
Life of this patent
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Abstract
The present invention relates to a dose setting and expelling device comprising a drive member and a dose setting mechanism which simultaneously sets a given dose and stores the energy necessary for a subsequently driving the drive member in order to expel a dose of medicine from an injection device. According to the invention the dose setting mechanism allows adjustment in both directions, such that a given set dose can be reduced or cancelled by reversing the input motion, typically by rotating a setting member backwardly, this in contrast to the known devices which either requires an additional release mechanism or which cannot be reversed at all.
Claims25
A dose setting device for use in combination with a fluid-filled reservoir, the dose setting device being adapted for repetitive injection of individually set doses of fluid from the reservoir, the dose setting device comprising:
- a housing (10),
- a drive member (30) adapted to expel a dose of medicine from the reservoir,
- a spring means (70),
- a dose setting assembly (40, 50, 60) mounted in the housing and connected to the spring means, the dose setting assembly comprising a dose setting member (50) being moveable in a first direction to a selected set position against the bias of the spring means, wherein movement of the dose setting member is accompanied by straining of the spring, and wherein the dose setting member is moveable in a second direction to selectively adjust the set dose,
- a latch means (80, 90) associated with the housing to retain the apparatus in the set position against the bias of the spring means, and
- the latch means being releasable to cause the drive member to expel the set dose from the syringe, the force for expelling the set dose being provided by the spring means.
A dose setting device as defined in any of the previous claims, wherein the latch means (80, 90) acts on the drive member.
A dose setting device for use in combination with a fluid-filled reservoir, the dose setting device being adapted for repetitive injection of individually set doses of fluid from the reservoir, the dose setting device comprising:
- a housing (108),
- a drive member (102) adapted to expel a dose of medicine from the reservoir in the syringe,
- a spring means (106),
- a dose setting assembly (101, 103) mounted in the housing and connected to the spring means, the dose setting assembly comprising a dose setting member (101) and a driving member (103) coupled to each other, the dose setting member being moveable in a first direction from an initial position to a selected set position against the bias of the spring means, wherein movement of the dose setting member is accompanied by straining of the spring means,
- a first latch means (109) associated with the housing to retain the device in the set position against the bias of the spring means,
- the first latch means being releasable to cause the drive member to expel the set dose from the syringe, the force for expelling the set dose being provided by the spring means, and
- wherein the coupling is adapted to be selectively disengaged thereby allowing the dose setting member to be moved in a second direction to selectively adjust the set dose.
An injection device for repetitive injection of individually set doses of a fluid from a reservoir, comprising:
- a body adapted for receiving a cartridge containing a fluid to be injected, the cartridge defining the reservoir and containing a piston, and
- a dose setting device as defined in any of the previous claims, the drive member acting on the piston in order to expel fluid from the cartridge.
An injection device for repetitive injection of individually set doses of a fluid from a reservoir, comprising:
- a body comprising a reservoir containing a fluid to be injected, the reservoir containing a piston, and
- a dose setting device as defined in any of the previous claims, the drive member acting on the piston in order to expel fluid from the reservoir.
A method for infusing a flowable drug into a living subject is provided, comprising the steps of:
- providing an injection device for repetitive injection of individually set doses of a drug from a reservoir, the injection device comprising a housing, a reservoir containing a drug to be injected and having an outlet means therefore, a drive member adapted to expel a dose of medicine from the reservoir, a spring means, a dose setting assembly mounted in the housing and connected to the spring means, the dose setting assembly comprising a dose setting member being moveable in a first direction to a selected set position against the bias of the spring means, wherein movement of the dose setting member is accompanied by straining of the spring, and wherein the dose setting member is moveable in a second direction to selectively adjust the set dose, a latch means associated with the housing to retain the injection device in the set position against the bias of the spring means, and the latch means being releasable to cause the drive member to expel the set dose from the reservoir, the force for expelling the set dose being provided by the spring means, the method comprising the further steps of:
- establishing a flow connection between the outlet means and the subject,
- selecting a dose by operating the dose setting member, and
- releasing the latch means to cause the drive member to expel the set dose of drug from the reservoir.
Dependencies are inferred from the claim text.