MIXING SYRINGE
First Claim
Patent Images
1. A syringe for mixing the constituents of a given composition and dispensing the same comprising:
- a. a barrel having a dispensing outlet at a forward end thereof and being open at the rear end thereof;
b. closure means separably mounted on the outlet end of the barrel;
c. piston means reciprocably mounted within the barrel and defining a chamber forwardly thereof for containing one constituent of the composition;
d. shuttle means mounted within the barrel for reciprocable movement therein;
e. movable chamber means in said piston means for containing another constituent of the composition;
f. said shuttle means including conduit means arranged for conjoint movement therewith;
g. said conduit means having one end portion engaged with and projecting through a wall portion of the movable chamber means; and
h. the other end portion the said conduit means being engaged with and projecting through the piston means;
whereby said conduit means is in communication between the first and second mentioned chambers via said conduit means for alternately and forcibly reversing the flow of the constituents of the composition between said chambers for mixing said constituents in response to selective reciprocal movement of the shuttle means relative to the barrel and the movable chamber means; and
whereby the composition may be dispensed from the barrel outlet upon removal of the closure means therefrom and in response to the combined forward movement of the shuttle means and the movable chamber means relative to the barrel.
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Accused Products
Abstract
A mixing syringe assembly which maintains the respective constituents of a composition in separate chambers, and which includes a shuttle assembly for interconnecting the chambers for mixing the respective constituents therein prior to use.
74 Citations
10 Claims
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1. A syringe for mixing the constituents of a given composition and dispensing the same comprising:
- a. a barrel having a dispensing outlet at a forward end thereof and being open at the rear end thereof;
b. closure means separably mounted on the outlet end of the barrel;
c. piston means reciprocably mounted within the barrel and defining a chamber forwardly thereof for containing one constituent of the composition;
d. shuttle means mounted within the barrel for reciprocable movement therein;
e. movable chamber means in said piston means for containing another constituent of the composition;
f. said shuttle means including conduit means arranged for conjoint movement therewith;
g. said conduit means having one end portion engaged with and projecting through a wall portion of the movable chamber means; and
h. the other end portion the said conduit means being engaged with and projecting through the piston means;
whereby said conduit means is in communication between the first and second mentioned chambers via said conduit means for alternately and forcibly reversing the flow of the constituents of the composition between said chambers for mixing said constituents in response to selective reciprocal movement of the shuttle means relative to the barrel and the movable chamber means; and
whereby the composition may be dispensed from the barrel outlet upon removal of the closure means therefrom and in response to the combined forward movement of the shuttle means and the movable chamber means relative to the barrel.
- a. a barrel having a dispensing outlet at a forward end thereof and being open at the rear end thereof;
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2. A syringe as recited in claim 1, wherein said shuttle means comprises a tubular member reciprocably mounted within the barrel, said tubular member including a transverse wall portion;
- said conduit means extending axially of the tubular member and being fixed to the transverse wall portion and said other end portion of said conduit means extending through and projecting beyond said transverse wall portion.
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3. The syringe as recited in claim 1 wherein said movable chamber means comprises a hollow plunger closed at the rear end thereof and being open at the forward end thereof;
- second piston means reciprocably mounted within the plunger for defining a chamber rearwardly thereof for containing said other constituent of the composition;
said plunger being mounted within the shuttle means for reciprocable movement therewith.
- second piston means reciprocably mounted within the plunger for defining a chamber rearwardly thereof for containing said other constituent of the composition;
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4. A syringe as recited in claim 3, wherein said plunger includes stop means engageable with the second piston means for limiting the rearward movement of said plunger relative to the shuttle means.
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5. A syringe as recited in claim 3, further comprising coacting means on each of the first and second piston means and the opposite end portions of said conduit means for interlocking the pistons with the respective end portions of said conduit means and connecting said pistons to said conduit means for conjoint movement therewith, whereby the terminal ends of said end portions respectively penetrate a wall portion of its associated piston means.
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6. A syringe as recited in claim 5, wherein said coacting means comprise enlarged head portions on the opposite end portions of said conduit means;
- said coacting means of said first and second piston means including cavity means for respectively receiving the head portions of said conduit means.
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7. A syringe as recited in claim 6, wherein the cavity means in each piston means is formed in one end surface thereof and is tapered toward the other end surface thereof to thereby provide a portion of relatively reduced thickness of said piston between the forward portion of said cavity means and the other end surface of said piston at the axis thereof;
- each of the head portions of said conduit means having a surface portion complementary to the taper of the cavity portion of the associated piston means;
the conduit means also havIng terminal ends projecting beyond said head portions; and
the axes of said terminal ends being respectively coincident with the axes of said first and second piston means.
- each of the head portions of said conduit means having a surface portion complementary to the taper of the cavity portion of the associated piston means;
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8. A syringe as recited in claim 1, wherein said shuttle means has a relatively enlarged end portion and said movable chamber means is expansible and includes a forward wall portion and an axially extensible wall portion extending therefrom;
- the forward wall portion of said expansible chamber means being slidably mounted within the relatively enlarged end portion of said shuttle means.
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9. A syringe as recited in claim 8, further comprising coacting means on the rear end portion of the conduit means and the forward wall portion of the expansible chamber for interlocking the conduit means with the forward wall portion of the expansible chamber and extending rearwardly beyond said forward wall portion.
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10. A syringe as recited in claim 9, further comprising coacting means on the forward end portion of the conduit means and the piston means for interlocking the conduit means with the piston means extending forwardly beyond said piston means.
Specification