Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1998-04-15
1999-11-23
Smith, Jeffrey A.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
A61M 3700
Patent
active
059892218
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to electronically controlled injection devices. More specifically, the invention relates to arrangements in electronically controlled injection devices, which facilitate a correct handling of the device when preparing it for the administering of one or more injections.
BACKGROUND OF THE INVENTION
Electronically controlled injection devices have recently been developed and put on the market. Such devices are generally adapted to utilize an injection cartridge with one or more chambers, and comprise an electronic control unit which may be programmed to carry out the necessary operations for the administering of injections.
Examples of electronically controlled injection devices according to the prior art are described in EP-A-0 164 539 and EP-A-0 293 958. These references give a good overview of the state of the art in this field.
Electronically controlled injection devices have turned out to have a number of important advantages, especially in those cases where the patient has to administer the injections to himself, as is the case in the ambulatory treatment of diabetics with insulin. The dose to be administered may be set in advance by the physician, and may even be set at a different value depending on which time of the day the dose is to be administered. The timer will give a signal when it is time for administering a dose, and the programmed electric motor will ensure that the correct amount is administered. Through modern electronical engineering and integrated circuitry, the device may be made small enough to resemble a fountain pen, which can easily be carried in an inside jacket pocket or in a lady's purse.
However, there is still room for improvements in this field. It is desirable to let the operations for the administering comprise the zeroing of a counter and a display before and after the administering, the removal of entrapped air from the cartridge, the metering out of doses of a predetermined magnitude, and the giving of a signal when the cartridge is empty. It may also be desirable to provide a timer to give a signal at the proper time for administering an injection, as well as other functions. The device may often also comprise an electrical motor which, on a signal from the control unit, drives a piston rod for a predetermined distance, such that a predetermined dose is administered. Other functions are also possible. This especially applies to the preparation and readying of the injection device before the first administering is to be carried out from a freshly inserted injection cartridge. These preparation and readying steps include the mixing of components to reconstitute an injectable composition in the cartridge, when a multi-chamber cartridge is used, the removal of entrapped gas from the cartridge, and the zeroing of the counter and/or display unit in the control unit before the first administering. If a multi-chamber cartridge is used, the mixing of components to reconstitute an injectable preparation is also included in the readying steps.
A multi-chamber injection cartridge usually comprises two chambers within a cartridge barrel, which chambers are separated by a front piston. The front chamber contains a solid component of an injectable composition, and is closed at its front end by a closure which may be pierced by an injection needle or cannula. The rear chamber contains a liquid component of an injectable composition and is closed at its rear end by a rear piston. To prepare the cartridge for the administering of an injectable composition, the rear piston is moved forward. Through the essentially incompressible liquid in the rear chamber, the front piston will then also be moved forward, and will at a predetermined position activate a bypass connection, such that the liquid in the rear chamber will be urged over into the front chamber to be mixed with the solid component and form a solution or dispersion to be injected. Multi-chamber injection cartridges comprising more than two chambers are also known.
The design a
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Pharmacia & UpJohn AB
Robert Eduardo C.
Smith Jeffrey A.
Villacorta Gilberto M.
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