SYRINGE WITH PISTON ASSEMBLY
First Claim
1. A syringe assembly for containing and dispensing a fluid material comprising:
- a syringe body having at least one barrel, said barrel having an open upper end and a lower end in communication with an outlet opening for accommodating and dispensing said fluid material;
a piston assembly movably positioned within said barrel, movable to dispense said material through said outlet opening; and
an activatable plunger in contact with said piston assembly to effect dispensing movement of said piston assembly;
said piston assembly including an outer piston in sealed engagement with said barrel and an inner piston in sealed engagement with said outer piston, said inner piston being movable within said outer piston with and against the bias of a spring to maintain said inner piston in contact with said fluid material in said barrel upon thermal expansion and contraction of said fluid material.
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0 Petitions
Accused Products
Abstract
A syringe assembly contains a fluid material, preferably two reactive fluid materials. The syringe assembly includes a syringe body having at least one barrel and a piston assembly movable within the barrel. An activatable plunger is in contact with the piston assembly effects dispensing movement of the piston assembly. The piston assembly includes an outer piston in sealed engagement with the barrel and an inner piston in sealed engagement with the outer piston. The inner piston is movable within the outer piston with and against the bias of a spring to maintain the inner piston in contact with the reactive material in the barrel upon thermal expansion and contraction of the reactive material.
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Citations
10 Claims
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1. A syringe assembly for containing and dispensing a fluid material comprising:
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a syringe body having at least one barrel, said barrel having an open upper end and a lower end in communication with an outlet opening for accommodating and dispensing said fluid material; a piston assembly movably positioned within said barrel, movable to dispense said material through said outlet opening; and an activatable plunger in contact with said piston assembly to effect dispensing movement of said piston assembly; said piston assembly including an outer piston in sealed engagement with said barrel and an inner piston in sealed engagement with said outer piston, said inner piston being movable within said outer piston with and against the bias of a spring to maintain said inner piston in contact with said fluid material in said barrel upon thermal expansion and contraction of said fluid material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification