Abstract: A retractable syringe (30) comprising a hollow barrel (32) with a radially inwardly facing abutment surface (54) and a needle hub (40) having first engagement formation (42) integrally formed with the needle hub. A radially outer portion (50) of the first engagement formation (42) is engaged with the abutment surface (54) to radially inwardly bias the first engagement formation (42). A plunger includes a second engagement formation (60) which the first engagement formation captively engages at the end of a stroke thereby engaging the plunger (34) with the needle hub (40). The needle tip is retractable into the barrel (34) upon application of a predetermined longitudinal force to the plunger (34).

Abstract: A single use syringe is disclosed having a leading end, a trailing end and a longitudinal axis. The syringe comprises a longitudinally extending hollow barrel, a plunger having a stem, a head and a needle tip. The head being longitudinally displaceable within the barrel. The stem having a first engagement formation and the head having a shoulder defining a second engagement formation. A locking bush is longitudinally fixed within the barrel, the bush having an aperture adapted to receive the stem, permitting the stem to slide longitudinally relative to the bush. The bush has a third engagement formation, and the bush also has an abutment surface defining a fourth engagement formation.

Abstract: An intravenous cannula assembly comprises a longitudinally extending barrel (10, 210), a cannula hub (30, 230), a cannula (50, 250), a cannula guard (70, 270) and a deployment mechanism (90, 100, 290, 300). The cannula hub (30, 230) is mounted in the barrel (10, 210) and has a hub aperture (35, 235) extending between the hub leading end (31, 231) and hub trailing end (32, 232). The cannula hub (30, 230) is adapted to mount a tube at the hub trailing end (32, 232) in fluid communication with the hub aperture (35, 235). The cannula (50, 250) is mounted in, and in fluid communication with, the hub aperture (35, 235). The cannula (50, 250) extends from the hub leading end (31, 231) through the barrel leading end (11, 211). The cannula guard (70, 270) is concentrically mounted about the cannula hub (30, 230).

Abstract: A single use syringe is disclosed having a leading end, a trailing end and a longitudinal axis. The syringe comprises a longitudinally extending hollow barrel, a plunger having a stem, a head and a needle tip. The head being longitudinally displaceable within the barrel. The stem having a first engagement formation and the head having a shoulder defining a second engagement formation. A locking bush is longitudinally fixed within the barrel, the bush having an aperture adapted to receive the stem, permitting the stem to slide longitudinally relative to the bush. The bush has a third engagement formation, and the bush also has an abutment surface defining a fourth engagement formation.

Abstract: A retractable syringe (30) comprising a hollow barrel (32) with a radially inwardly facing abutment surface (54) and a needle hub (40) having first engagement formation (42) integrally formed with the needle hub. A radially outer portion (50) of the first engagement formation (42) is engaged with the abutment surface (54) to radially inwardly bias the first engagement formation (42). A plunger includes a second engagement formation (60) which the first engagement formation captively engages at the end of a stroke thereby engaging the plunger (34) with the needle hub (40). The needle tip is retractable into the barrel (34) upon application of a predetermined longitudinal force to the plunger (34).

Abstract: A single use syringe (20) comprising a hollow barrel (22) having a longitudinal axis X extending in a longitudinal direction and including a first engagement formation (74) formed on an internal wall of said hollow barrel (22). The syringe (20) includes a needle tip (24) in fluid communication with the barrel (22), and a plunger (28) insertable within the barrel (22). The plunger (28) having a stem (29) and a head (34) separably connected to the stem (29). The head (34) including a second engagement formation (46). The plunger (28) being displaceable through a longitudinal stroke in the longitudinal direction, to a captive position at an end of the stroke in which the first engagement formation (74) engages the second engagement formation (46), thereby securing the plunger (28) within the barrel (22).