Needle sheath

Details Needle sheath Needle sheath

1979-09-27

1980-12-09

Yasko, John D.

Surgery

Respiratory method or device

Ozone or ion generation

128221, A61M 500

Patent

active

042378826

ABSTRACT:
A sheath (24) is provided for a syringe (10) having a barrel (18) with a needle assembly (22) projecting axially from the distal end thereof. The needle assembly (22) has a hub (28) with radially projecting ears (62) for threading into a collar (42) on the barrel (18). At least one axially extending, radially projecting rib (60) is carried by the hub (28). The sheath (24) has at least one camming flute (66) comprised of a flat circumferentially facing abutting surface (72) on one side and an axially and circumferentially facing cam surface (74) on the other side thereof. The sheath (24) frictionally grips the needle hub (28) with one rib (60) juxtaposed with respect to the camming flute (66). Rotation of the sheath (24) in one direction will engage the flat surface (72) with the rib (60) to rotate the needle assembly (22) with the sheath (24) for unthreading the needle assembly from the collar (42) on the barrel (18). Rotation of the sheath (24) in the opposite direction engages the rib (60) with the axially facing cam surface to initially thread the hub (28) onto the collar (42) and continued rotation urges the sheath (24) axially relative to the needle assembly (22) to disconnect the sheath (24) from the needle assembly (22).

REFERENCES:
patent: 2911971 (1959-11-01), Quinche et al.
patent: 3721241 (1973-03-01), Klohr et al.
patent: 4027669 (1977-06-01), Johnston et al.
patent: 4121588 (1978-10-01), Geiger

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