Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-10-04
1992-05-12
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604263, A61M 532
Patent
active
051123150
ABSTRACT:
A retractable syringe includes a resilient barrel, one end of which comprises a mounting collar. A needle carrier is releasably mounted within the collar, and releasably supports a needle cartridge. A hypodermic needle is mounted within the cartridge. A sheath attaches at one end to the cartridge, and at the other end to the collar. A plunger is telescoped into the barrel, and includes a relatively hard piston sealingly engaging the barrel. The piston includes a latch for engaging the carrier and releasing it from the collar. A pocket in the carrier has a support member in its center, and a pair of helical ribs for threadingly engaging a pair of tabs on the cartridge. The cartridge sealingly receives the support member. The collar has slots and inclined threads in its bore wall for engaging lugs on the carrier. The inclined threads have a friction bump near their blind ends. A retaining pin prevents relative rotation between the carrier and collar prior to desired retraction of the needle into the barrel. An alternative embodiment includes a barrel which may be non-resilient and a soft resilient piston having a plunger head secured therewithin and attached to the plunger. A latch is attached to the plunger head, and is received in a recess in the carrier to engage latch stops for rotating the carrier to release it from the collar. Both embodiments may include means for securing the plunger in the barrel after retraction.
REFERENCES:
patent: 4747830 (1988-05-01), Gloyer et al.
patent: 4874382 (1989-10-01), Lindemann et al.
patent: 4888002 (1989-12-01), Braginetz et al.
patent: 4950241 (1990-08-01), Ranford
Bright Frederick G.
Gloyer Walter W.
Ostfeld David M.
Retrax, Inc.
Yasko John D.
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