Injection device
First Claim
1. An injection device comprisinga housing, a retainer axially movable within said housing for movement therein, during an injection, between a distal position and a proximal position thereof, a fluid container within said retainer, a plunger axially movable within said fluid container, a driving member axially displaceable within said housing, a toothed rod having a plurality of teeth arranged thereon in a longitudinal direction, said toothed rod being disposed in said housing for axial displacement therein and for acting on said plunger to express fluid from said fluid container during an injection, a first coupling device cooperating with teeth on the toothed rod, provided on said retainer, which normally locks said toothed rod to said retainer but permits relative axial movement therebetween while said retainer is not within a first predetermined axial position range inside said housing, and said toothed rod is moving in a predetermined axial rod movement direction, and a second coupling device, cooperating with teeth on the toothed rod, provided on said driving member, which normally locks said driving member to said toothed rod but permits relative axial movement therebetween while said driving member is not within a second predetermined axial position range inside said housing, and said driving member is moving in a predetermined driving member axial movement direction.
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0 Petitions
Accused Products
Abstract
The invention relates to an injection device (10) having a housing (15) and an injection fluid container (12) which can move, in relation to this housing, between a distal and proximal end position, and also having a pushrod (14) to act on a plunger (23) in this container (12) for the purpose of expelling fluid from the container. A drive connection (27) is provided between the pushrod (14) and the container (12) and, in the distal end position of the container, this drive connection is effective in both the proximal and the distal direction, but in the proximal end position of the container (12), it is only effective when the pushrod (14) is moved in the distal direction.
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Citations
43 Claims
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1. An injection device comprising
a housing, a retainer axially movable within said housing for movement therein, during an injection, between a distal position and a proximal position thereof, a fluid container within said retainer, a plunger axially movable within said fluid container, a driving member axially displaceable within said housing, a toothed rod having a plurality of teeth arranged thereon in a longitudinal direction, said toothed rod being disposed in said housing for axial displacement therein and for acting on said plunger to express fluid from said fluid container during an injection, a first coupling device cooperating with teeth on the toothed rod, provided on said retainer, which normally locks said toothed rod to said retainer but permits relative axial movement therebetween while said retainer is not within a first predetermined axial position range inside said housing, and said toothed rod is moving in a predetermined axial rod movement direction, and a second coupling device, cooperating with teeth on the toothed rod, provided on said driving member, which normally locks said driving member to said toothed rod but permits relative axial movement therebetween while said driving member is not within a second predetermined axial position range inside said housing, and said driving member is moving in a predetermined driving member axial movement direction.
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5. An injection device, comprising:
- a housing,
a retainer axially movable within said housing for movement therein, during an injection, between a distal position and a proximal position thereof, a fluid container within said retainer, a plunger axially movable within said fluid container, a driving member axially displaceable within said housing, a toothed rod disposed in said housing for axial displacement therein and for acting on said plunger to express fluid from said fluid container during an injection, a first coupling device provided on said retainer and cooperating with teeth of said toothed rod, which normally locks said toothed rod to said retainer but permits relative axial movement therebetween while said retainer is not within a first predetermined axial position range inside said housing, and said toothed rod is moving in a predetermined axial rod movement direction, and a second coupling device provided on said driving member, and cooperating with teeth of said toothed rod, which normally locks said driving member to said toothed rod but permits relative axial movement therebetween while said driving member is not within a second determined axial position range inside said housing, and said driving member is moving in a predetermined driving member axial movement direction, and further comprising, coupled to the driving member, a detent mechanism, and a spring, acting upon the driving member in the proximal direction, and adapted to be compressed by moving the driving member and detent mechanism in the distal direction, said detent mechanism engaging against a fixed portion of said housing when a predetermined cocked position is reached. - View Dependent Claims (6, 40)
the housing is formed with a radial opening therein, a clip, provided on the outside of the housing, is movable at said radial opening against the detent mechanism inside the housing, to release the detent mechanism and to thus trigger an injection process. -
40. The injection device according to claim 5, wherein said spring is made of a plastic material.
- a housing,
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19. An injection device having a housing, comprising
an injection fluid container disposed in said housing, a toothed rod movable in relation to the housing to expel fluid from said container, a retainer serving to hold the container and movable in the housing between a proximal and a distal position, said retainer comprising a proximal retainer portion and a distal retainer portion, said retainer portions being axially displaceable relative to each other for permanently adjusting the length of said retainer.
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22. An injection device, comprising
a housing, a retainer axially movable within said housing for movement therein, during an injection, between a distal position and a proximal position thereof, a fluid container within said retainer, a plunger axially movable within said fluid container, a driving member axially displaceable within said housing, a toothed rod disposed in said housing for axial displacement therein and for acting on said plunger to express fluid from said fluid container during an injection, a first coupling device provided on said retainer, and cooperating with teeth on said toothed rod, which normally locks said toothed rod to said retainer but permits relative axial movement therebetween while said retainer is not within a first predetermined axial position range inside said housing, and said toothed rod is moving in a predetermined axial rod movement direction, and a second coupling device provided on said driving member, and cooperating with teeth on said toothed rod, which normally locks said driving member to said toothed rod but permits relative axial movement therebetween while said driving member is not within a second predetermined axial position range inside said housing, and said driving member is moving in a predetermined driving member axial movement direction, and wherein the housing comprises two parts, and a device is provided for changing the relative position of the housing parts by linearly moving them relative to each other.
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36. An injection device having
a housing for receiving a container for a fluid to be injected, an actuating member, a toothed rod, having a longitudinal axis that is axially movable in response to said actuating member to expel fluid from a container disposed in the housing, and an axially movable part which engages against said toothed rod, wherein, in accordance with the, invention, the toothed rod, viewed in cross section transverse to its longitudinal axis, is polygonal; -
at least two sides of a plurality of sides of said rod are each formed with a respective row of teeth, and said rows of teeth cooperate with said axially movable part;
said rows of teeth each have a predetermined tooth division, said axially movable part comprises a plurality of engaging members, and each engaging member is formed with at least one engaging element having a shape substantially complementary to a cooperating one of said rows of teeth and each engaging member is elastically biassed against said cooperating row of teeth, and wherein, in order to facilitate finer adjustment of an axial position of said toothed rod within said housing, there is an axial offset among at least one of the respective rows of teeth with respect to each other, and the engaging elements on the respective enagaging members with respect to each other. - View Dependent Claims (37, 38, 39, 43)
a first orientation wherein a first one of said engaging members is fully engaged with a first one of said rows of teeth and a second one of said engaging members is elastically biassed against, but not fully engaged with, a second one of said rows of teeth, and a second orientation wherein said first one of said engaging members is elastically biassed against, but not fully engaged with, said first one of said rows of teeth and said second one of said engaging members is fully engaged with said second one of said rows of teeth whereby said axial position of said toothed rod within said housing can be adjusted more finely than a pitch spacing of said teeth.
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Specification