Piercing needle having hydrophobic filter vent

Details Piercing needle having hydrophobic filter vent Piercing needle having hydrophobic filter vent

1992-01-15

1993-09-07

Wilson, John J.

Surgery

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

Treating material introduced into or removed from body...

604168, A61M 5178

Patent

active

052424111

ABSTRACT:
A piercing needle with which a flashback can be reliably confirmed and air can be prevented from remaining in its hub portion. The piercing needle comprises an outer needle having a hub, an inner needle to be inserted into the outer needle, a hub portion of which is adapted to be fitted in the outer needle hub, and a valve disc to close the internal cavity of the outer needle. Side holes are formed in the distal end of the outer needle. The outer needle hub is provided with a hydrophobic vent filter near the valve disc to allow the internal cavity of the outer needle hub to communicate with the outer atmosphere.

REFERENCES:
patent: 3312220 (1967-04-01), Eisenberg
patent: 4149535 (1979-04-01), Volder
patent: 4200096 (1980-04-01), Charvin
patent: 4416290 (1983-11-01), Lutkowski
patent: 4610665 (1986-09-01), Matsumoto et al.
patent: 4675017 (1987-06-01), Sato
patent: 4682980 (1987-07-01), Suzuki
patent: 4917671 (1990-04-01), Chang
patent: 4935010 (1990-06-01), Cox et al.
patent: 5032116 (1991-07-01), Peterson et al.
patent: 5104389 (1992-04-01), Deem et al.

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