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An automatic injector comprising an elongated housing assembly having a forward end, a stressed spring assembly mounted within the rearward end of the housing assembly so as to be released in response to a predetermined manual actuation procedure, and a medicament injection cartridge assembly mounte

An automatic injector comprising an elongated housing assembly having a forward end, a stressed spring assembly mounted within the rearward end of the housing assembly so as to be released in response to a predetermined manual actuation procedure, and a medicament injection cartridge assembly mounted within the forward end of the housing assembly in cooperating relation with the stressed spring assembly. The improvement of the present invention is in the medicament injection cartridge assembly which includes a medicament container, a hypodermic needle disposed forwardly of the container mounted in a sterile condition within the housing assembly adjacent the forward end thereof. A forward seal is provided for sealing the forward end of the container from the hypodermic needle. A rearward piston is mounted in the rearward end of the container for forward movement therein in slidably sealed relation thereto. A plurality of individual dosages of different relatively incompatible liquid medicaments is disposed within the container between the forward seal and the piston separated by a movable interior seal within the interior of the container between the piston and the forward seal. The improved arrangement is operable in response to the manual accomplishment of the manual actuating procedure and the resultant release of the stressed spring assembly to move the hypodermic needle forwardly and outwardly of the housing assembly into the muscle tissue of a patient and the piston forwardly into the container so that the plurality of individual dosages therein is moved forwardly out of sealed relation with respect to the forward and interior seal outwardly through the needle into the muscle tissue of the patient.

대표청구항 ▼

In an automatic injecting device including an elongated housing assembly having a forward end, stressed spring means mounted within said housing so as to be released in response to a predetermined manual actuation procedure, and a medicament injection cartridge assembly mounted within said housing a

In an automatic injecting device including an elongated housing assembly having a forward end, stressed spring means mounted within said housing so as to be released in response to a predetermined manual actuation procedure, and a medicament injection cartridge assembly mounted within said housing assembly in cooperating relation with said stressed spring means, the improvement which comprises said medicament injection cartridge assembly comprising a medicament container, a hypodermic needle disposed forwardly of said container mounted in a sterile condition within said housing assembly adjacent the forward end thereof, forward seaing means for sealing the forward end of said container from said hypodermic needle, a rearward piston mounted in the rearward end of said container for forward movement therein in slidably sealed relation thereto, a plurality of individual dosages of different relatively incompatible liquid medicaments within said container between said forward sealing means and said piston, said plurality of dosages including a forward dosage and a rearward dosage, movable interior sealing means within the interior of said container between said piston and said forward sealing means maintaining the individual dosages sealingly separated from one another, said interior sealing means comprising an intermediate piston between said forward and rearward dosages mounted for forward movement within said container in slidably sealed relation thereto, means operable in response to the manual accomplishment of said manual actuating procedure and the resultant release of said stressed spring means for moving said hypodermic needle forwardly and outwardly of said housing assembly into the muscle tissue of a patient and said piston forwardly into said container so that the plurality of individual dosages therein are moved forwardly out of sealed relation with respect to said forward and interior sealing means outwardly through said needle into the muscle tissue of the patient, said manual actuating procedure responsive means comprising a by-pass bulge in the peripheral wall of said container adjacent the forward end thereof of an axial extent sufficient to enable the forward movement of said rearward dosage to move said intermediate piston forwardly into a by-pass position adjacent the forward end of said container during which said forward dosage is moved forwardly and outwardly through said needle and following which the forward movement of the rearward dosage continues through said by-pass bulge and outwardly through said needle.