Frost protected injection device
First Claim
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1. A medical injection device comprising:
- a housing;
a variable volume reservoir containing a liquid drug and comprising an outlet and a movable wall;
an injection mechanism operable to inject a dose of the liquid drug and comprising an actuation member adapted to displace the movable wall in a first direction; and
a coupling mechanism, wherein the injection device is configured to prevent a movement of the actuation member in a second direction substantially opposite the first direction in response to a subjection of the actuation member to a first force being of a magnitude which is smaller than a threshold value and to allow a reversible movement of the actuation member in the second direction in response to a subjection of the actuation member to a second force from the reservoir acting on the actuation member via the movable wall, the second force being of a magnitude which is equal to or greater than the threshold value.
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Accused Products
Abstract
The invention relates to an injection device (100, 200, 300) which is capable of resisting proximal movements of a piston rod (107, 207, 307) relative to a housing (102, 202, 302), when the piston rod (107, 207, 307) is subjected to proximally directed forces below a threshold magnitude, and of allowing reversible proximal movements of the piston rod (107, 207, 307) relative to the housing (102, 202, 302), when the piston rod (107, 207, 307) is subjected to proximally directed forces of or above the threshold magnitude.
14 Citations
14 Claims
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1. A medical injection device comprising:
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a housing; a variable volume reservoir containing a liquid drug and comprising an outlet and a movable wall; an injection mechanism operable to inject a dose of the liquid drug and comprising an actuation member adapted to displace the movable wall in a first direction; and a coupling mechanism, wherein the injection device is configured to prevent a movement of the actuation member in a second direction substantially opposite the first direction in response to a subjection of the actuation member to a first force being of a magnitude which is smaller than a threshold value and to allow a reversible movement of the actuation member in the second direction in response to a subjection of the actuation member to a second force from the reservoir acting on the actuation member via the movable wall, the second force being of a magnitude which is equal to or greater than the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification