Dual-chamber syringe & method

Details Dual-chamber syringe & method Dual-chamber syringe & method

1994-09-27

1996-03-05

Yasko, John D.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 89, A61M 519

Patent

active

054962846

ABSTRACT:
A dual-chamber syringe has a plunger within an inner delivery chamber in fluid communication with an ejection port. The deliver chamber is formed within a tubular element axially slidable within a tubular guide. The tubular guide and the syringe outer barrel form an outer reservoir chamber. The outer reservoir chamber is sealed from the delivery chamber while the tubular element is in a first position within the guide. Upon withdrawal of the plunger, frictional contact imparted by the plunger seal causes the tubular element to slide away from sealing engagement with the barrel into a second position within the guide. In the second position of the tubular element, a fluid passageway is opened from the reservoir to the delivery chamber allowing fluid to be drawn into the delivery chamber. A porous seal between the plunger rod and barrel allows air into the reservoir during transfer of fluid to the delivery chamber. Pressing the plunger inward first moves the tubular element from the second position back to the first position to close the fluid passageway and then expels fluid from the delivery chamber through the ejection port.

REFERENCES:
patent: 212046 (1879-02-01), Palmer
patent: 213978 (1879-04-01), Dibble
patent: 368627 (1887-08-01), Threlfall
patent: 553234 (1896-01-01), Finot
patent: 936205 (1909-10-01), Woodruff
patent: 1950137 (1934-03-01), Dowe
patent: 3749084 (1973-07-01), Cucchiara
patent: 4655747 (1987-04-01), Allen, Jr.
patent: 4834714 (1989-05-01), Lascar et al.
patent: 5078691 (1992-01-01), Hamacher
patent: 5143211 (1992-09-01), Miczka et al.

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