Injection device

An injection device, comprising:

• a base having a proximal end and a surface disposed at a distal end thereof for contacting a patient's skin, the base comprising a first locking mechanism;
• a sliding body slidably connected to the base, the sliding body comprising a locking feature and a second locking mechanism;
• a double-ended needle fixed to the sliding body;
• a biasing member for proximally biasing the sliding body with respect to the base, and for retracting the needle into the device subsequent to activation of the device;
• a medicament cartridge for holding a medicament, slidably connected to the sliding body, wherein the second locking mechanism locks the medicament cartridge relative to the sliding body upon completion of displacement of the medicament cartridge relative to the sliding body;
• and
• a stopper slidably disposed within the medicament cartridge;
• wherein the first locking mechanism and the locking feature interact to lock the sliding member relative to the base subsequent to retraction of the needle into the device;
• and
• wherein the sliding body is moveable from a first position in which the needle is disposed entirely within the device, to a second position in which a portion of the needle extends outside of the device, and to a third position in which the needle is retracted entirely within the device, wherein the third position is distally displaced relative to the first position.

An injection device, comprising:

• a base having a proximal end and a surface disposed at a distal end thereof for contacting a patient's skin, the base comprising a first locking mechanism;
• a sliding body slidably connected to the base, the sliding body comprising a locking feature and a second locking mechanism;
• a double-ended needle fixed to the sliding body;
• a biasing member for proximally biasing the sliding body with respect to the base, and for retracting the needle into the device subsequent to activation of the device;
• a medicament cartridge for holding a medicament, slidably connected to the sliding body, wherein the second locking mechanism locks the medicament cartridge relative to the sliding body upon completion of displacement of the medicament cartridge relative to the sliding body;
• and
• a stopper slidably disposed within the medicament cartridge;
• wherein the first locking mechanism and the locking feature interact to lock the sliding member relative to the base subsequent to retraction of the needle into the device;
• and
• wherein the first locking mechanism comprises:
• a plurality of angled lips disposed circumferentially about an interior of the base, the angled lips projecting radially inward and being angled distally, each angled lip having a proximal angled surface and a distal angled surface;
• and
• a plurality of axial ribs circumferentially disposed about the interior of the base, the ribs being distally separated from the angled lips to define a locking space therebetween.

An injection device, comprising:

• a base having a proximal end and a surface disposed at a distal end thereof for contacting a patient's skin, the base comprising a first locking mechanism;
• a sliding body slidably connected to the base, the sliding body comprising a locking feature and a second locking mechanism;
• a double-ended needle fixed to the sliding body;
• a biasing member for proximally biasing the sliding body with respect to the base, and for retracting the needle into the device subsequent to activation of the device;
• a medicament cartridge for holding a medicament, slidably connected to the sliding body, wherein the second locking mechanism locks the medicament cartridge relative to the sliding body upon completion of displacement of the medicament cartridge relative to the sliding body;
• and
• a stopper slidably disposed within the medicament cartridge;
• wherein:
• the first locking mechanism and the locking feature interact to lock the sliding member relative to the base subsequent to retraction of the needle into the device;
• the medicament cartridge comprises a cartridge lip protruding radially outward from a distal end thereof;
• and
• the second locking mechanism of the sliding body comprises a locking rib protruding radially inward, the locking rib being disposed adjacent a distal end of a cartridge channel of the sliding body in which the medicament cartridge travels;
• and
• upon completion of displacement of the medicament cartridge relative to the sliding body, the cartridge lip distally passes the locking rib and the locking rib locks the medicament cartridge relative to the sliding body.

An injection device, comprising:

• a base having a proximal end and a surface disposed at a distal end thereof for contacting a patient's skin, the base comprising a plurality of angled lips and a plurality of axial ribs, each plurality being disposed circumferentially about an interior of the base;
• a sliding body slidably connected to the base, the sliding body comprising a holding rib protruding radially inward and a plurality of circumferentially disposed, distally depending, cantilevered legs, each leg having a pair of feet circumferentially protruding from a distal end thereof;
• a double-ended needle fixed to the sliding body;
• a biasing member for proximally biasing the sliding body with respect to the base, and for retracting the needle into the device subsequent to activation of the device;
• a medicament cartridge for holding a medicament, the medicament cartridge being slidably connected to the sliding body and having a cartridge lip protruding radially outward from a distal end thereof, the cartridge lip being disposed adjacent to the holding rib prior to activation of the device;
• and
• a stopper slidably disposed within the medicament cartridge;
• wherein a force applied to the medicament cartridge to displace the cartridge lip distally past the holding lip exceeds a force applied to the medicament cartridge to displace the feet distally past the angled lips and drive the needle into a patient's skin.

A method for injecting a medicament in a patient using an injection device comprising a base, a sliding body slidably connected to the base, a double-ended needle fixed to the sliding body, a biasing member, a rigid medicament cartridge for holding a medicament, the medicament cartridge being slidably connected to the sliding body, and a stopper slidably disposed within the medicament cartridge, the method comprising:

• pressing the medicament cartridge toward the patient's skin/injection site to sequentially:
• distally displace the sliding body relative to the base, insert the needle into the patient, and compress the spring;
• puncture the stopper with the needle to establish fluid communication between the needle and the medicament cartridge;
• proximally displace the stopper relative to the medicament cartridge to eject the medicament from the medicament cartridge;
• and
• lock the medicament cartridge relative to the sliding body;
• subsequent to ejecting the medicament from the medicament cartridge, ceasing pressure on the medicament cartridge to sequentially:
• proximally displace the sliding body relative to the base to withdraw the needle from the patient due to the force of the spring;
• and
• lock the sliding member relative to the base to prevent reuse of the device.