Needle device for infusion

Details Needle device for infusion Needle device for infusion

1990-02-26

1991-08-20

Rosenbaum, C. Fred

Surgery

Container for blood or body treating material, or means used...

Having hollow needle or spike for piercing container or...

604405, 604126, 604256, A61M 532

Patent

active

050411063

ABSTRACT:
An improved infusion needle device of the type including a liquid delivering passage and an air introducing passage extending in parallel with each other includes a tubular needle, a bottom portion into which the rear part of the tubular needle is immovably fitted, a flange portion made integral with the bottom portion, a cover member airtightly secured to the flange portion and a valve disc received beneath a circular projection on the flange-shaped part of the cover member. As air enters through an air inlet port on the flange portion, the valve disc is raised up so that air is introduced into the interior of the parenteral liquid container via a cutout on the circular projection, a clearance between the bottom portion and the cover member and an annular clearance between the tapered foremost end of the cover member and the tubular needle. When liquid in the container flows out through the air inlet port, the valve disc comes in the inside wall surface of the flange portion under the effect of the dead weight of the liquid itself to close the air inlet port with the valve disc.

REFERENCES:
patent: 3662752 (1972-05-01), Yokoyama
patent: 3783895 (1974-01-01), Weichselbaum
patent: 3797521 (1974-03-01), King
patent: 3822700 (1974-07-01), Pennington
patent: 3993068 (1976-11-01), Forbery
patent: 4211588 (1980-07-01), Raines
patent: 4262671 (1901-04-01), Kersten
patent: 4787898 (1988-11-01), Raines
patent: 4857068 (1989-08-01), Kahn
patent: 4959053 (1990-09-01), Jang

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