Abstract: A cylinder ampoule (1) having a first end sealed by a closure through which an injection unit can communicate with a medicament in the ampoule and a second end closed by a piston (3) which can be forced into the ampoule (1) to press out a dose of a medicament stored in the ampoule between the closure and the piston (3) through said injection unit, which cylinder ampoule (1) has a non-circular inner cross section and which piston (3) has a non-circular cross section corresponding to the inner cross section of the ampoule (1). A piston rod (4) has a pressure foot (5) which has a cross section corresponding to the inner cross section of the ampoule (1) and is non-rotatably connected to the piston rod (4).

Abstract: The invention concerns an apparatus for the registration of the setting of a medical device, the setting of which implies a mechanical adjustment of at least two relatively moveable elements of the device. The invention is characterized in that the apparatus is intended for disconnectible engagement with the medical device, and that it has detector means for detecting the mechanical adjustment and has information means arranged for providing information related to said mechanical adjustment.

Abstract: A syringe having a dose setting mechanism, a button which can be operated to inject a set dose, a switch operated at a time between the start and completion of injection, and an electronic presentation of parameters such as the size of a set dose and the size of the last dose administered. The syringe also has a stop watch which is reset and started responsive to operation of the switch. The electronic presentation includes an indication of the number of hours elapsed from the activation of the switch, and may also include, for a predetermined period initially following the activation of the switch, a presentation of the number of seconds elapsed. The latter presentation can provide a visual indication to the patient of the length of time, after the injection button has been actuated to inject the dose, that the needle should remain inserted in the skin.

Abstract: The present invention relates to a drug delivery system, comprising a reservoir from which set doses are apportioned, a dose setting mechanism by which the relative position of two elements is changed by a distance proportional to a set dose, and a push button by activation of which an element is moved a distance corresponding to the distance proportional to the set dose, further comprises a working cylinder having an open end into which a plunger fits, and a closed end at which an inlet and an outlet port connect the space beneath the plunger with an inlet communicating with the reservoir and an outlet communicating with a drug delivery member, respectively. Valves means at the inlet and outlet control the passages from the reservoir to the working cylinder and from the working cylinder to the drug delivery member, respectively. The cylinder with the plunger, and the injection member are independently exchangeable, disposable parts.

Abstract: An infuser for infusing a liquid from a reservoir, comprising a durable part (1,2,3) forming a housing and a disposable part (4) containing the liquid reservoir and an energy reservoir for energizing the pumping function. The infuser, further, contains in its disposable part (4) all liquid-contacting elements of the device, and the disposable part (4) and the durable part (1,2,3) are provided with mating coupling means (10,11).A controlling unit in an electronic compartment (3) of the durable part (1,2,3) has a socket (12) into which a plug (13) may be inserted, the plug (13) contains a ROM carrying information defining infusion data. The plug (13) has a transparent sheet (14) covering a display (8) of the durable part when the plug (13) is inserted in the socket (12). The sheet (14) carries a graphic representation of the information in the ROM to be seen in relation to information displayed on the display (8).

Abstract: In a displacement system for controlled infusion of a liquid from a cartridge comprising a tubular vessel (1), which is at a rear end closed by a piston (3) which may be forced by a piston rod (8) moving into the vessel (1) in the axial direction thereof to press out the liquid through an outlet (2) arranged at a front end of the vessel (1), the piston rod (8) is provided as a flexible incompressible construction which is by a piston rod guide (9) behind the rear end of the cartridge deflected away from the axis of this cartridge, preferably 180.degree.. The piston rod guide (9) has a guiding track comprising a curved part and linear parts at each end of the curved part ensuring that the piston rod is guided along a length (a) in the direction of the axis of the cartridge which length (a) is longer than the distance (b) between the two axes of the piston rod parts projecting from the piston rod guide.

Abstract: An injector comprising a changeable cylinder ampoule (2) containing medicine for a number of injections into which ampoule a piston (4) is pressed by a piston rod (9) driven by a drive mechanism to dispense a dose of medicine through a nozzle (5) as a high speed jet which penetrates the skin. The injector comprises a distal part (1) accommodating the cylinder ampoule (2) and a proximal part (8) containing the drive mechanism and the piston rod (9) which can be advanced a set distance by the drive mechanism when released, the distal and the proximal parts being provided with mutually engaging threads so that one of these parts can successively be screwed into the other to set a dose to be delivered by the device.

Abstract: The present invention relates to a drug delivery device wherein a dose to be apportioned from a cartridge is set by changing the relative position of co-operating dose setting elements (3, 5) and is injected by pressing a button (5) until this button abuts a stop (6). By operation of count up (7) or count down (8) buttons the dose is set and read into an electronic circuit (9) comprising a microprocessor and the dose setting movement of the dose setting elements relative to each other is performed by a motor (11) controlled by the circuit in accordance with the read in dose. The set dose is shown on a display (10). The motor (11) is further controlled to perform certain movements of the piston rod (3) so as retraction of this rod when a cartridge (1) is going to be changed an advancing of the piston rod to abutment with the piston (2) after the cartridge has been changed and further to advance this piston to expel air from the cartridge.