Abstract: A hypodermic implant device, comprising a barrel; an upper piston segment engaged with an inner wall of the barrel; an axially aligned needle extendably distally out of the barrel for insertion into an object when the upper piston segment is moved distally within the body; a lower piston segment push rod in alignment with the needle, so that upon distal movement of the lower piston segment, the push rod moves distally through the needle expelling a releasable implant housed in the needle; and a means for retraction of the needle into a needle receptacle in the barrel.

Abstract: A hypodermic implant device, comprising a barrel; an upper piston segment engaged with an inner wall of the barrel; an axially aligned needle extendably distally out of the barrel for insertion into an object when the upper piston segment is moved distally within the body; a lower piston segment push rod in alignment with the needle, so that upon distal movement of the lower piston segment, the push rod moves distally through the needle expelling a releasable implant housed in the needle; and a means for retraction of the needle into a needle receptacle in the barrel.

Abstract: A hypodermic injection device comprised of a barrel with an open end, an annular barrel grip at the open end, a luer sleeve at the distal end, a septum in the luer sleeve, and a guide-way in alignment with the central axis of the barrel extending through a guide-way in the luer sleeve. The injection device also comprises a piston in alignment with the central axis engaged for sliding movement within the barrel. The piston has a lock attached to the piston for depression of the lock into a depression space so the piston may be extended into the barrel and for return of the lock to a raised position upon release of depression pressure to allow the piston to be again locked from axial extension into the barrel. The piston also has a faceplate on its distal end with a hook at its periphery for hooking a support plate when the piston is turned within the barrel.

Abstract: A hypodermic implant device, comprising a barrel; an upper piston segment engaged with an inner wall of the barrel; an axially aligned needle extendably distally out of the barrel for insertion into an object when the upper piston segment is moved distally within the body; a lower piston segment push rod in alignment with the needle, so that upon distal movement of the lower piston segment, the push rod moves distally through the needle expelling a releasable implant housed in the needle; and a means for retraction of the needle into a needle receptacle in the barrel.