Two compartment mixing syringe
AssigneeMark L. Anderson
InventorJames F. Ennis, III
Life of this patent
Estimating the term…
Abstract
A mixing syringe having an inner cylindrical barrel open at one end, and closed at its other end by a thin, tough, membrane bonded thereto. The barrel may contain a first liquid. A plunger inserted in the barrel has a sliding, sealing head which applies pressure to the liquid to rupture the membrane when the plunger is advanced. The barrel is slidably inserted in an open end of an outer barrel in sealing relationship therewith, and has a tip on the other end of the outer barrel. The outer barrel contains a liquid or other material to mix with the first liquid when the membrane is ruptured. The mixture is discharged from the outer barrel via the tip when the inner barrel is advanced axially in the outer barrel.
Claims13
A mixing syringe, comprising:
- an inner cylindrical barrel open at one end and closed at its other end and defining an inner compartment therein for containing a quantity of a liquid;
- a membrane bonded to the other end of said inner barrel closing the same thereat;
- an outer cylindrical barrel open at one end thereof and defining an outer compartment therein for containing a material to be mixed with said liquid, said inner barrel being axially inserted through said one end of said outer barrel in slidable sealing contact therewith;
- an elongated plunger axially movable in said inner barrel and having a head force fitted in sliding, frictional, sealing contact with said inner barrel for exerting pressure on said liquid when said plunger is advanced axially to rupture said membrane, so that said liquid enters said outer compartment and mixes with said material therein;
- an open tip at the other end of said outer barrel for discharging said mixture of said liquid and said material from said outer compartment, when said plunger and said inner barrel are advanced axially in said outer barrel;
- said inner cylindrical barrel having a stop means intermediate the ends thereof for preventing said elongated plunger from moving axially therefrom when subjected to an inadvertently applied force;
- and
- said inner barrel having means extending from said stop means to said open end of said inner barrel for venting air therethrough when said elongated plunger is axially moved from said open end to said stop means.
Dependencies are inferred from the claim text.