Medical Injection Device
First Claim
1. A medical injection device for setting and injecting set doses from a held drug cartridge, comprising:
- a housing defining proximal and distal ends,a dose setting arrangement including a dose setting device that is moved in a first direction away from a predetermined stop in accordance with the size of a set dose and that moves back to the predetermined stop during injection of the set dose, the predetermined stop being configured for being fixedly arranged relative to the housing,an injection activator adapted to be activated to inject the set dose,a piston rod adapted to translate relative to the housing in a distal direction in order to expel a set dose, anda rotatable driver coupled to the piston rod and including a stored energy source configured to drive rotation of the driver when the injection activator is activated to cause the piston rod to translate relative to the housing, Wherein;
the dose setting device defines a dose control member configured for rotation around a first axis,a first clutch arrangement is arranged between the dose control member and the driver, wherein the first clutch arrangement is disengaged during dose setting so that the dose control member rotates independently of the driver, and wherein the first clutch arrangement engages upon activation of the injection activator to enable the driver to rotate the dose control member while causing the dose setting device to move back towards the predetermined stop, anda second clutch arrangement arranged between the driver and the housing, wherein the second clutch arrangement is engaged during dose setting so that the driver is prevented from rotating during dose setting, and wherein the second clutch arrangement disengages upon activation of the injection activator to enable the driver to rotate relative to the housing.
1 Assignment
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Accused Products
Abstract
The present invention relates to an injection device (1) for setting and injecting set doses from a held drug cartridge (10). The injection device (1) comprises a housing (110, 120, 130, 140), a piston rod (800), a rotatable driver (500, 700) and a dose control member (350). A stored energy source (560) is configured to drive rotation of the driver (500, 700) to cause the piston rod (800) to expel a set dose. The dose control member (350) rotates during dose setting and during dose expelling. A first clutch (C1) is arranged between the dose control member (350) and the driver (500, 700). A second clutch (C2) is arranged between the driver (500, 700) and the housing (110, 120, 130, 140) to control the expelling movement. During dose setting the first clutch (C1) is disengaged and the second clutch (C2) is engaged. During dose expelling the first clutch (C1) is engaged and the second clutch (C2) is disengaged.
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Citations
15 Claims
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1. A medical injection device for setting and injecting set doses from a held drug cartridge, comprising:
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a housing defining proximal and distal ends, a dose setting arrangement including a dose setting device that is moved in a first direction away from a predetermined stop in accordance with the size of a set dose and that moves back to the predetermined stop during injection of the set dose, the predetermined stop being configured for being fixedly arranged relative to the housing, an injection activator adapted to be activated to inject the set dose, a piston rod adapted to translate relative to the housing in a distal direction in order to expel a set dose, and a rotatable driver coupled to the piston rod and including a stored energy source configured to drive rotation of the driver when the injection activator is activated to cause the piston rod to translate relative to the housing, Wherein; the dose setting device defines a dose control member configured for rotation around a first axis, a first clutch arrangement is arranged between the dose control member and the driver, wherein the first clutch arrangement is disengaged during dose setting so that the dose control member rotates independently of the driver, and wherein the first clutch arrangement engages upon activation of the injection activator to enable the driver to rotate the dose control member while causing the dose setting device to move back towards the predetermined stop, and a second clutch arrangement arranged between the driver and the housing, wherein the second clutch arrangement is engaged during dose setting so that the driver is prevented from rotating during dose setting, and wherein the second clutch arrangement disengages upon activation of the injection activator to enable the driver to rotate relative to the housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification