Abstract: The syringe includes a cylindrical barrel, a plunger in part disposed within the barrel and an elongated end cannula extending from the distal end of the barrel and formed integrally with the barrel of a single unitary plastic material. The plunger includes a distal end portion within the barrel having surfaces cooperable with surfaces along the interior of the barrel and enabling separation of the plunger end from remaining portions of the plunger in response to relative rotation of the plunger and barrel. A collar may be disposed about the cannula to seal with the lip of a medication vial. A clip is engageable within the plunger and barrel to fix the axial location of the plunger relative to the barrel at selected locations therealong.

Abstract: A syringe includes an elongated syringe barrel formed of a transparent material; a cannula adjacent one end of the barrel for transmission of fluid into our out of the barrel; a plunger disposed in the barrel and extending through an opposite end of the barrel from the one end; index markings along one side of the barrel for use in identifying various dosage amounts; and a collar moveable along the barrel facilitating indication of a custom marking of a desired dosage amount on the barrel.

Abstract: A cannula is disclosed for transferring fluid relative to a vial or intravenous port having an elastomeric membrane. The cannula includes a blunt solid penetration tip and one or more ports intermediate opposite ends of the cannula in communication with a passage opening into a Luer fit or a Luer lock for securing the cannula to the tip of a syringe. Indicia on the cannula between the proximal end and the ports represent a predetermined distance substantially corresponding to the extent of penetration of the side port of the cannula body through the membrane necessary to locate at least a portion of the side port on the opposite side of the membrane from the second end and directly adjacent the membrane.

Abstract: A cannula for transferring fluid relative to a vial or intravenous port having an elastomeric membrane includes: a cannula body having first and second opposite ends; the first end terminating in a tip for penetrating the elastomeric membrane; the body having a passage opening through the second end and extending within the cannula body towards the first end, the passage opening through at least one horizontal-oriented port through a side surface of the cannula body thereby to enable flow of fluid along the passage and between the opening through the second end and the side port. An axial width of the port is smaller than a thickness dimension of a vial through which the cannula tip is to be inserted. A related method is also described.

Abstract: The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. These complementary surfaces afford initial resistance to further axial movement of the plunger toward the adapter, signalling the user that further axial pressure will permanently lock the plunger and adapter to one another whereby, upon application of full axial pressure on the plunger, the complementary surfaces of the plunger and adapter permanently lock to one another to enable joint unitary movement of the plunger and adapter together with the needle carried by the adapter into the barrel.