Automatic injection device with reset feature
First Claim
1. A dose setting device for use in combination with a fluid-filled reservoir, the dose setting device for repetitive injection of individual set doses of fluid from the reservoir, the dose setting device comprising:
- a housing;
a drive member to expel a dose of fluid from the reservoir;
a spring for driving the drive member to expel the dose;
a dose setting assembly mounted in the housing and connected to the spring, the dose setting assembly comprising a first portion being moveable by a user in a first direction to set a selected dose against the bias of the spring and a remaining portion, wherein movement of the first portion is accompanied by a straining of the spring, and wherein the first portion is moveable in an opposite direction to selectively adjust the set dose without moving the drive member and wherein the first portion is in continuous engagement with the remaining portion of the dose setting assembly;
a latch means associated with the housing to retain the apparatus in the set position against the bias of the spring; and
wherein the latch means is releasable to cause the drive member to expel the set dose from the fluid-filled reservoir when the dose-setting device is used in combination therewith, the force for expelling the set dose being provided by the spring.
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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.
406 Citations
23 Claims
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1. A dose setting device for use in combination with a fluid-filled reservoir, the dose setting device for repetitive injection of individual set doses of fluid from the reservoir, the dose setting device comprising:
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a housing;
a drive member to expel a dose of fluid from the reservoir;
a spring for driving the drive member to expel the dose;
a dose setting assembly mounted in the housing and connected to the spring, the dose setting assembly comprising a first portion being moveable by a user in a first direction to set a selected dose against the bias of the spring and a remaining portion, wherein movement of the first portion is accompanied by a straining of the spring, and wherein the first portion is moveable in an opposite direction to selectively adjust the set dose without moving the drive member and wherein the first portion is in continuous engagement with the remaining portion of the dose setting assembly;
a latch means associated with the housing to retain the apparatus in the set position against the bias of the spring; and
wherein the latch means is releasable to cause the drive member to expel the set dose from the fluid-filled reservoir when the dose-setting device is used in combination therewith, the force for expelling the set dose being provided by the spring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A dose setting device for use in combination with a fluid-filled reservoir, the dose setting device for repetitive injection of individual set doses of fluid from the reservoir, the dose setting device comprising:
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a housing;
a drive member to expel a dose of fluid from the reservoir;
a spring for driving the drive member to expel the dose;
a rotatable dose setting assembly mounted in the housing and connected to the spring, wherein the dose setting assembly comprises a coupling providing a resistance which is sufficient to prevent the spring to counter rotate the dose setting member, the resistance being easily overcome by a user setting the dose setting member in either direction, whereby a user can selectively increase or decrease a dose setting the dose setting assembly comprising a dose setting member coupled to the drive member, 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, wherein movement of the dose setting member is accompanied by straining of the spring, a first latch means associated with the housing to retain the device in a set position against the bias of the spring, the first latch means being releasable to cause the drive member to expel the set dose from the fluid-filled reservoir when the dose-setting device is used in combination therewith, the force for expelling the set dose being provided by the spring. - View Dependent Claims (21, 22)
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23. A method of infusing a flowable drug into a living subject is provided, comprising the steps of:
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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 to expel a dose of drug from the reservoir, a spring member for driving the drive member, a dose setting assembly mounted in the housing and connected to the spring, 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, 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 opposite direction to selectively adjust the set dose, the dose setting member being freely moveable in the opposite direction, a latch means associated with the housing to retain the injection device in the set position against the bias of the spring, and the latch means being releaseable 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, the method comprising the further steps of;
establishing a flow connection between the subject and the outlet means;
selecting a dose by operating the dose setting member, and releasing the latch means thereby causing the spring to drive the drive member to expel the set dose of the drug from the reservoir.
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Specification