Injection device

Details Injection device Injection device

2000-01-27

2001-05-08

Nguyen, Anhtuan T. (Department: 3763)

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

C604S207000

Reexamination Certificate

active

06228067

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to devices for self-injection of medication and, more particularly, to a device having a housing and a longitudinally movable piston rod disposed in the housing for expression of an injectable fluid from a fluid container.
BACKGROUND
Such injection devices are used primarily by older diabetics, who often no longer see well and who can be overwhelmed by manipulation of complex devices. Therefore, the devices must be simple and as foolproof to operate as possible, so that the correct dose is always injected.
SUMMARY OF THE INVENTION
Therefore, it is an object of the invention to provide a new injection device, of the aforementioned type, which operates simply and reliably.
Briefly, this is achieved by providing in the device an expressing member, an actuating member, and a position-dependent connecting device which couples the actuating member to the expressing member to expel fluid from a container through the injection needle. Through the activation and deactivation of the connecting device in dependence upon the axial position of the actuating member relative to the housing, such a device becomes very simple to operate, substantially eliminating faulty operation.
A particularly advantageous embodiment of the invention is to bias the expressing member in the proximal direction by a force which is less than the detachment force of the plunger in the fluid container. This assures that, prior to the start of an injection, the expressing member rests reliably against the plunger of the fluid container and therefore, the full selected dose is always injected. Also, for constant dosing, it is necessary to select the injection quantity only once, and this selection will also be effective for all subsequent injections.
Further details and advantageous refinements of the invention will be apparent from the following description and accompanying drawings of several embodiments, which are to be understood as exemplary, and not as limiting the invention.


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