Filter needle
OwnerVictor D. Chiarollainventor
Life of this patent
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Abstract
A simple device which attaches to an injection syringe for preventing possible contaminants in a fluid drawn into the syringe from being expelled therefrom into an intravenous solution, for example. The device hereof is simply comprised as a needle holder adapted for removable attachment to a syringe barrel for accepting the flow of a liquid into the syringe during loading of same and which automatically filters such liquid dispensed from the syringe through the needle.
Claims5
An improved filter device for an injection syringe which has a plunger disposed in a barrel for drawing a fluid into the barrel through a front opening and ejecting such fluid therefrom by plunger movement comprising:
- a housing having a syringe receiving rear opening at the rear thereof for engagement with a syringe about the front opening thereof and a needle receiving aperture at the front thereof for engaging a hypodermic needle in extension therefrom,
- said housing defining first and second separate passages extending between said rear opening and front aperture thereof,
- a first one-way valve disposed in said first passage for admitting the flow of fluid therethrough only from said aperture to said opening,
- a second one-way valve disposed in said second passage for admitting the flow of fluid therethrough only from said opening to said aperture, and
- filter material disposed in one of said passages on the inlet side of the valve therein.
Dependencies are inferred from the claim text.