Note: Descriptions are shown in the official language in which they were submitted.
~35~5~
The present invention relates to hypodermic syringes
generally used in the medical and dental fields, and is portico-
laxly directed to a multiple barrel syringe for the successive
dispensing of different fluids in a prearranged selected manner.
The multiple barrel syringe of this invention is constructed to
permit each of the barrels to be loaded with a different fluid
through the common needle thereof.
In our US. patent No. 4,109,653, filed August 29,1978,
and entitled "Multiple Barrel Syringe", we have disclosed a
successive delivery multiple syringe which comprises a body
formed with a pair of bores, each containing a different fluid
to be dispensed, each of said bores containing a slid able plunger.
ale syringe mounts a single needle through which the fluid is
dispensed, and each bore communicates with the needle through a
respective one-way valve in the nature of a rubber duck-bill
valve. Depression of either of the plungers produces fluid
pressure in the associated bore which opens up its one-way valve
lo enable the luckily from said bore to pass through the needle.
Ml.xin~ of the fluids within the syringe from one bore to the
I other I eliminated or made negligible by the inclusion of the
one valve to the needle.
The syringe shown in patent No. 4,109,653 is particular-
lye adapted for use in dental root canal therapy in which derided
particles are removed by first injecting hydrogen peroxide under
pressure into the root canal, and immediately thereafter inject-
in a chlorinate soda solution such as sodium hypochlorite into root canal. Since two syringes are normally required for
hi successive injection, the use of a single syringe having two
brollies containing the different fluids was found beneficial and
85~
effective in decreasing the time between successive injection and
reducing the number of syringes used with a consequent saving of
time of loading and sterilization.
Because the syringe of the aforementioned patent included
one-way valves to prevent fluid from on bore from mixing with
the fluid in the other bore, it was not possible to fill the
syringe by drawing fluid upwardly through the needles. Filling
of the bores was only possible by removing the plungers there-
from and pouring the selected fluid individually into the opened
lo tops of the bores. This is often a cumbersome and time-consuming
procedure, especially in root canal therapy where it is desirable
to Jill the syringe barrels in a rapid manner from vessels con-
twining the selected fluids. In addition, the removal of the
plunger. for barrel loading of the syringe may result if- con tam-
inane ox tile otherwise sterile syringes.
It is an object of the present invention to provide amull:iple barrel syringe of the type described which is construct-
Ed Jo permit loaning of each of its barrels through a single
needle, without removal of the plungers.
I Another object of the invention is the provision of a
mul~lple barrel syringe of the character described which includes
control valves which operate to prevent the fluids in the barrels
Rome mixing during operation of the syringe, and which are also
operable to permit the barrels to be individually filled through
the common needle.
A further object of the invention is to provide a multiple
barrel syringe which can be loaded through a single needle from
Jingle source to avoid multiple capsule type loading and thus
Sue the same uniform type medicament or other solution from
a Lyle homogeneous batch.
In accordance with the invention herein, where is provided
a successive delivery multiple barrel syringe having a body
formed with a pair of bores, each containing a repressible plunge
or, and each communicating with a single needle. Each bore
terminates in a narrow conduit leading to a recess containing a
flexible and compressible cone-shaped valve. Each valve recess
communicates through a second narrow conduit with the hollow
needle of the syringe. The cone-shaped valve normally fills the
interior of the recess in which it is housed and prevents the
I fluid in the opposite bore from flowing into the interior of its
communicating bore during operation ox the syringe. A manually-
operable member is associated with each cone-shaped valve for
selective compression and deformation of said valve when said
syringe is to be filled, thereby bringing said second conduit
lo into communication with the first conduit through the valve
recess and enabling the associated bore to be filled through the
needle.
Thus, broadly, the invention contemplates a multiple
barrel syringe for the selective dispensing of fluids which
I comprises body portion having a plurality of lluld-retaining
bores Wyeth plurality o~,individually,depressible plungers
extending respectively into the buyers single hollow needle
mounted on the body portion and fluid conduit means connecting
each ox the bores with the interior of the hollow needle. The
fluid conduit means comprises first fluid conduit communicating
with each of the buyers valve recess communicating with each
lust fluid conduit, and a second fluid conduit communicating
ok on end with the valve recess.and.at the other end with the
interior of the hollow needle. A flexible valve member is housed
3-
ISLE
in each of the valve recesses and normally fills the interior
-thereof, with the body of the valve member covering and sealing
off the communicating ends of the first and second fluid conduits
against passage of fluid upwardly through the conduits. A
movable seal-release member is movably mounted adjacent each
respective valve recess with each.seal-release member having a
portion projecting outwardly from the exterior of the syringe
body portion and positioned to be selectively and manually
actuated to move the seal release member into engagement with
the valve member in the recess in a direction to engage and
deform the valve member sufficiently to unseal the communicating
ends ox the first and second fluid conduits. In this manner,
flailed can be drawn upwardly through the needle to the bore
communicating with the valve recess containing the deformed
valve member in response to withdrawal of the plunger in the
Gore, whereby each of the bores may be filled independently
wow dl~erent fluid through the single needle`.
Additional obj cut and advantages of the invention will
become apparent Doria the course of the following specification
when taken ion connection with the accompanying drawings, in which:
FIG. 1 is a front elevation Al view of a multiple barrel
syringe made in accordance with the present invention;
FIG. 2 is a side elevation Al view thereof;
FIG. 3 is a top plan view thereof;
I FIG. 4 is a sectional view taken along line 4-4 of FIG. l; .
and
FIG. 5 is an enlarged fragmented sectional view of a portion
of the syringe as shown in FIG. 4.
So
Referring in detail to the drawings, there is shown a
successive delivery multiple barrel Saxon 10 made in accordance
with the present invention and comprising a body 12 hazing dual
spaced bores 14, 16, each of which contains a respective slid able
plunger 18, 20.
At their lower ends, the bores 14 and 16 terminate in
respective conduits 22 and 24 of reduced diameter for the trays-
mission of fluids from said bores in response to depression of
the respective plungers 18 and 20 in said bores. The conduits
lo 22 and 24 extend to and open into respective cone-shaped
recesses 25 and 27 which house valves 26 and 28.
Each of the valve recesses 25 and 27 communicateJthrough
respective second conduits 30 and 32 of small diameter, with a
hollow syringe needle 36 mounted at the bottom of the syringe body.
The second conduits 30 and 32 depend from the respective valve no-
cusses 25, 27 and are inclined inwardly, meeting at a junction 33
which communicates with the central bore 34 of the hollow needle
36, as shown in FIGS 4 and 5.
It will be seen that the valve recesses 25 and 27 are cone-
shaped, having a apex end 38 located adjacent to an outer side of
the syringe body and a base end 40 located adjacent the center of
the syringe body and formed with a peripheral Lange 42. Each of
the eeriest conduits 22, 24 communicates with the respective valve
recess adjacent its base end portion 40, while each of the second
conduits 30, 32 communicates with -the apex end portion 38 of the
respective valve recess.
Mach of the valves 26, 28 is made in the form of a hollow,
cone-sllapecl membrane or cup which is made of a flexible and deform-
nil Motorola suck as rubber, having a shape-retaining memory.
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so
The valves 26, I are made of the same size and shape as the
interior ox the-valve recesses 25, 27 so that they fit snugly
within the latter and normally fill the interior of the valve
recesses, as shown in full line in FIG. 5, with no appreciable
air space between the inner surfaces of the recesses and the
outer surfaces of the valves. Each of the valves 26, 28 has a
base portion formed with a peripheral flange 44 which is seated
within the peripheral flange portion 42 of the respective recess
25, 27, thereby retaining the valves in mounted position.
lo The apex ends 38 of each of the valve recesses 25, 27 are
snubbed or cut off, as shown in FIG. 5, and communicate with a
cylindrical bore 46 of larger diameter. The apex or tip 48 of
each valve 26, 28 projects through the snubbed apex end 38 of the
respective valve recess 25, 27, and extends into the cylindrical
bore 46. Slid ably mounted in each cylindrical bore 46 is a button
or finger piece 50 having at its end an enlarged head 52 located
exteriorly of the syringe body in a position to be engaged and
nun fly depressed by the user to deform the adjacent valve, for
purposes of filling the syringe, in a manner to be described in
on Doyle.
ion the syringe 10 is ready for use in dispensing fluids,
the bores 14 and 16 are filled with different fluids and the
pllmger 18 and 20 are in extended position. If fluid is first to
be dispensed from bore 16, for example, the syringe is held in one
hand in the usual manner, and the plunger 20 is depressed by the
thumb, applying pressure to the fluid within the bore 16 and within
its commullicatin~ first conduit 24. The pressurized fluid within
conduit I engages the flexible cone-shaped valve 28 at its apex
potion 4G, and constricts and distorts the wall of the valve
I
sufficiently to provide a passageway between the valve body and
the surface of the conical recess 27, so that the fluid flows
from the first conduit I around the body of valve 28, to the
second conduit 32 and then to the base 34 of needle 36. The same
action occurs when the plurlger 18 is subsequently depressed to
feed the fluid in bore 14 to the needle 36. In each instance, the
pressure of the fluid distorts the body of the respective flexible
valve within its associated recess to such an extent that the pros-
surized fluid forms its own path through the valve recess from
lo the first conduit 22 or 24 to the second conduit 30 or 32.
The valves 26 and 28 serve to prevent fluid from one bore
14 or 16 from entering into the opposite bore and mixing with the
fluid therein. Thus, when the plunger 18, for example, is depressed
to Eye fluid from bore I through the second conduit 30 to the
needle 36, some of this fluid may be diverted upwardly, via junk-
lion 33l through the opposite second conduit 32. Since the second
conduit 32 communicates with the base end portion of the valve 28,
the force of ISLES dlver~ed fluid is not sufficient to warp or deform
e valve body at its wide base portion, and the body of valve 28
I bloclcs further travel of the diverted fluid so that it does not
enter valve recess 27 and, therefore, cannot reach bore 16.
As previously indicated, the primary purpose of the multiple
barrel syringe of the present invention its to permit each of the
bores to be loaded with fluid through the syringe needle. It will
be appreciated that since the cone-shaped valves 26, 28 completely
fill the correspondingly-shaped valve recesses 25, 27, if it were
l~lemp~cd to fill one of the bores, for example, the bore 16, by
:ln.qertin~ the tip ox needle 36 in a container of fluid and pulling
the plural 20 upwardly, the tip or apex portion I of the valve 28
8 S 8
seals off the lower end of first conduit 24, thereby preventing
the suction created within bore 16 from being applied through
second conduit 32 and the hollow needle 36 to the fluid. I've
buttons 50 are provided to upset this seal created by the valve,
and to permit needle loading.
When it is desired to fill bore 16 by drawing fluid up-
warmly through the needle 36, the syringe body 12 is held in one
hand with the needle il~nersed in the fluid, and the button 50
held depressed by the thumb or finger. The other hand grasps
lo the plunger 20 and pulls it upwardly to an extended position.
Depression of the 'button 50 causes it to slide inwardly
through cylindrical bore 46 so that the end of the button engages
and presses inwardly upon the protruding tip or apex 48 of valve
28. This pressure upon the tip 48 in a direction along the axis
of valve 28, causes the flexible cone-shaped valve to deform in
such a manner that its walls bow inwardly as indicated by the
broken lines 28' in FIG. 5. This deformation of the valve 28
l~r~alcs the seal which Kit would normally create, and clears the
ends of the first and second conduits 24 and 32 for the passage
ox fluid there through. Thus, when the plunger 20 is elevated,
the suction cremated -Lo bore 16 is applied through first conduit
24, valve recess 27, second conduit 32 and the bore 34 of needle
36 to the fluid. Fluid is thus drawn through the needle 36,
second conduit 32, valve recess 27 and first conduit 24 to the
bore 16 until the bore 16 is filled to the desired extent.
It will be appreciated that the same procedure is followed
for filling the outer bore 14 through the needle 36, by depressing
the opposite button 50 adjacent valve 26 and withdrawing plunger 18.
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After the needle-loading of each of the bores has been come
pleated, the button 50 is released and the flexible cone-shaped
valve returns to its original shape, its tip pressing against the
end of the depressed button 50 and sliding it back to its extended
position.
While a preferred embodiment of the invention has been
shown and described herein, it is obvious that numerous omissions,
changes and additions may be made in such embodiment without de-
parting from the spirit and scope of the invention.
