Abstract: A method and apparatus for injecting medicine from a pre-filled container into a patient through an injection needle. After use, the needle is automatically shielded to prevent inadvertent contact with the needle. The device operates by pumping medicine out of the vial and into a transfer chamber. The medicine is then expelled from the transfer chamber into a patient during an injection stroke. At the end of the injection stroke, the needle is released for retraction, and the spring retracts the needle for shielding. The device can include an injector assembly and a vial holder assembly. The injector assembly has a needle retainer for releasably retaining the needle in a projecting position against the bias of a spring. The vial holder assembly is attachable with the injector assembly and is operable to transfer fluid from the vial and into the transfer chamber for an injection.

Abstract: A device for injecting fluid from a pre-filled cartridge is provided. The device includes a needle for piercing a patient. After an injection, the needle can be retracted to prevent inadvertent contact with the contaminated needle. A needle retainer releasably retains the needle in the retracted position. The needle can subsequently be re-extended to administer a subsequent injection. After the cartridge is emptied, the cartridge can be removed, if desired, and replaced with another cartridge for additional injections. Alternatively, the needle can be retracted into the device and safely disposed of in a sharps container.

Abstract: A device is provided for injecting fluid from a pre-filled cartridge. The device includes a needle and a hollow barrel that holds a pre-filled cartridge. A needle retainer releasably retains the needle in an extended position so the needle can be inserted into a patient. A plunger in the rear of the barrel cooperates with the cartridge to expel fluid from the cartridge during an injection. After an injection, the needle is automatically retracted into the barrel when pressure is released from the plunger. A locking mechanism locks the contaminated needle and cartridge in the barrel after needle retraction. After use, the device may be safely disposed of in a sharps container.

Abstract: A safety needle-bearing device for mixing and injecting medication from a two-chambered cartridge is provided. The device includes a needle that extends through the forward end of a barrel. A two-chambered cartridge is attached to the barrel and contains components of a medication stored separately in the chambers. A plunger in the rearward end of the cartridge can be advanced into the cartridge to combine the separate components and prepare the medication. As the cartridge is advanced forwardly into the barrel, the medication is injected through the needle and into a patient. At the completion of the injection stroke, the cartridge engages a needle retainer to actuate needle retraction. The needle is subsequently retracted to shield the contaminated needle.

Abstract: A device is provided for injecting fluid from a pre-filled cartridge. The device includes a needle and a hollow barrel that holds a pre-filled cartridge. A needle retainer releasably retains the needle in an extended position so the needle can be inserted into a patient. A plunger in the rear of the barrel cooperates with the cartridge to expel fluid from the cartridge during an injection. After an injection, the needle is automatically retracted into the barrel when pressure is released from the plunger. A locking mechanism locks the contaminated needle and cartridge in the barrel after needle retraction. After use, the device may be safely disposed of in a sharps container.

Abstract: A method and apparatus are provided for injecting medicine from a pre-filled container into a patient through an injection needle. After use the needle is automatically shielded so that the contaminated needle is protected to prevent inadvertent contact with the needle. The device operates by pumping medicine out of the vial into a transfer chamber. The medicine is the expelled from the transfer chamber into the patient during an injection stroke. At the end of the injection stroke, the needle is released for retraction, and the spring then retracts the needle to shield the needle. Preferably, the device includes an injector assembly and a vial holder assembly. The injector assembly has a needle retainer for releasably retaining te needle in a projecting position against the bias of a spring. The vial holder assembly is attachable with the injector assembly and is operable to transfer the medicine out of the vial and into the transfer chamber to prepare the device for an injection.

Abstract: A safety needle-bearing device for mixing and injecting medication from a two-chambered cartridge is provided. The device includes a needle that extends through the forward end of a barrel. A two-chambered cartridge is attached to the barrel and contains components of a medication stored separately in the chambers. A plunger in the rearward end of the cartridge can be advanced into the cartridge to combine the separate components and prepare the medication. As the cartridge is advanced forwardly into the barrel, the medication is injected through the needle and into a patient. At the completion of the injection stroke, the cartridge engages a needle retainer to actuate needle retraction. The needle is subsequently retracted to shield the contaminated needle.