U.S. patent number 3,872,864 [Application Number 05/377,148] was granted by the patent office on 1975-03-25 for double syringe.
Invention is credited to Robert E. Allen, Jr..
United States Patent |
3,872,864 |
Allen, Jr. |
March 25, 1975 |
Double syringe
Abstract
A double syringe assembly is disclosed which comprises an outer
housing enclosing an inner housing. The two housings define an
outer reservoir between them and an inner reservoir inside the
inner housing. There are three ports in the outer housing and one
port in the inner housing. Further, there are corresponding sealing
beads on the outer surface of the inner housing for covering and
uncovering two of the outer-housing ports and a sealing bead on the
inner surface of the outer housing for covering and uncovering the
inner-housing port. A separate plug is provided for covering and
uncovering the third outer-housing port. The inner housing has a
needle mounting tube extending from an end thereof which is
inserted through an opening in the end of the outer housing. The
needle mounting tube has a bead formed on the outer surface thereof
which prevents axial movement between the two housings, but allows
rotational movement. A protruding annularly-shaped sealing ring is
formed on the inner surface of the outer-syringe, encircling the
opening. Further, an annularly-shaped slot is formed about the base
of the needle mounting tube on the outer surface of the inner
syringe for receiving the sealing ring. Thus a seal is formed to
hold diluent in the outer reservoir. In addition, a similar
arrangement of sealing elements is provided at the opposite end of
the syringe assembly.
Inventors: |
Allen, Jr.; Robert E. (Laurel,
MD) |
Family
ID: |
23487961 |
Appl.
No.: |
05/377,148 |
Filed: |
July 6, 1973 |
Current U.S.
Class: |
604/89;
604/92 |
Current CPC
Class: |
A61M
5/31596 (20130101) |
Current International
Class: |
A61M
5/315 (20060101); A61m 005/18 () |
Field of
Search: |
;128/218M,218P,218R,220,234,235,237,DIG.28,215,216,218D
;206/47R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: McGowan; J. C.
Attorney, Agent or Firm: Griffin, Branigan and Butler
Claims
The embodiments of the invention in which an exclusive property or
privilege are claimed are as follows:
1. A syringe comprising:
a cylindrically-shaped hollow outer housing having a relatively
large opening at a first end thereof, a smaller opening at a second
end thereof and at least one port in a sidewall thereof, said at
least one port being located closer to said outer-cylinder first
end than to said outer-cylinder second end, said
cylindrically-shaped hollow outer housing including a first sealing
means encircling said large opening and a second sealing means
encircling said smaller opening;
a cylindrically-shaped hollow inner housing having an outer
diameter less than the outer-housing inner diameter inserted in
said outer-housing through said large opening, said inner housing
having a relatively large opening at a first end thereof, a smaller
opening at a second end thereof, and a port in a sidewall thereof,
said port being located closer to said inner-housing second end
than than to said inner-housing first end, said
cylindrically-shaped hollow inner housing including a first sealing
means encircling said large opening for engaging said first sealing
means of said outer housing and a second sealing means encircling
said smaller opening for engaging said second sealing means of said
outer housing, said inner-housing defining an inner reservoir in
the interior thereof;
a plunger inserted into said inner reservoir of said inner housing
through said large opening, said plunger including a tip thereon
for engaging the inner surface of said inner housing, and thereby
preventing fluid flow in said inner reservoir past said tip;
a mounting means holding said inner housing tightly inside said
outer housing with said respective large and small openings of said
inner and outer housings being adjacent one another, said inner and
outer housings forming an outer reservoir therebetween, said
mounting means allowing relative rotation between said inner and
outer housings, but yet providing sufficient axial restraint to
hold said first sealing means of said outer housing in tight
engagement with said first sealing means of said inner housing,
thereby preventing fluid leakage from an outer-reservoir first end,
and said second sealing means of said outer housing in tight
engagement with said second sealing means of said inner housing,
thereby preventing fluid leakage from an outer-reservoir second
end;
wherein, a first bead means is included on an inner surface of said
outer housing for covering and uncovering said port in said inner
housing in response to relative rotation between said inner and
outer housings, a second bead means is included on an outer surface
of said inner housing for covering and uncovering said at least one
port in said outer housing in response to relative rotation of said
inner and outer housings and said bead means are angularly
positioned relative to one another so that they simultaneously
cover and uncover said ports.
2. A syringe as claimed in claim 1 wherein said
cylindrically-shaped hollow outer housing includes a second port in
a sidewall thereof, said second port being located closer to said
outer-housing first end then to said outer-housing second end, and
wherein is further included a plug for insertion into said second
outer-housing port for selectively covering and uncovering said
second outer-housing port.
3. A syringe as claimed in claim 1 wherein said mounting means
comprises a needle-mounting tube which is integral with said inner
housing and which protrudes longitudinally outwardly at said second
end of said inner housing, with an interior passage thereof forming
said smaller opening in said inner housing, said needle-mounting
tube being of such a size and shape to fit through said smaller
opening in said outer housing, said needle-mounting tube including
a bead protruding from the outer surface thereof which is of such
size and shape, and is so positioned that it retains the inner and
outer housings against axial movement so that said respective first
sealing means of said inner and outer housings and said respective
second sealing means of said inner and outer housings are
maintained in close contact with one another but yet relative
rotation is allowed between said inner and outer housings.
4. A syringe as claimed in claim 3 wherein said bead protruding
from the outer surface of said needle-mounting tube is of such a
size and shape that it may be force "popped" through said smaller
opening in said outer housing.
5. A syringe as claimed in claim 3 wherein said
cylindrically-shaped hollow outer housing includes a second port in
a sidewall thereof, said second port being located closer to said
outer-housing first end than to said outer-housing second end, and
is further included a plug for insertion into said second
outer-housing port for selectively covering and uncovering said
second outer-housing port.
6. A syringe as claimed in claim 3 where:
said outer-housing first sealing means comprises an annularly
shaped sealing groove which faces axially in the direction of said
first end and said inner housing first sealing means comprises a
flange and a annularly shaped sealing ring protruding from a bottom
surface of said flange in an axial direction toward said second
end, said sealing ring being constructed of such a size and shape
as to fit into said outer-housing sealing groove; and
said inner housing second sealing means comprises an annularly
shaped sealing groove axially facing said second end and said outer
housing second sealing means is a sealing ring protruding from the
inner surface thereof axially toward its first end, and being of
such a size and shape as to fit into said inner-housing sealing
groove.
7. A syringe as claimed in claim 1 wherein a post is integral with
said outer housing and is located along the inner surface thereof,
said post being of such a size, and being positioned, so as to
limit relative rotation between the outer and inner housings by
engaging one of said beads.
8. A syringe as claimed in claim 1 wherein is further included a
needle mounting tube integral with said inner housing which
protrudes longitudinally outwardly at said second end of said inner
housing, with an interior passage thereof forming said smaller
opening in said inner housing, said needle mounting tube being of
such a size and shape to fit snugly through said smaller opening in
said outer housing.
9. A syringe as claimed in claim 1 wherein said plunger tip
includes at least three axially separated sealing members for
engaging the inner surface of said inner housing.
10. In a syringe comprising:
a cylindrically shaped hollow outer housing having a relatively
large opening at a first end thereof, and a smaller opening at a
second end thereof, said cylindrically shaped hollow outer housing
including a first sealing means encircling said large opening at a
first end thereof, and a smaller opening at a second end thereof;
and
a cylindrically shaped hollow inner housing, having an outer
diameter less than the outer-housing inner diameter, inserted into
said outer-housing through said large opening, said inner housing
having a relatively large opening at a first end thereof and a
smaller opening at a second end thereof, said inner housing
including a first sealing means encircling said large opening for
engaging said first sealing means of said outer housing and a
second sealing means encircling said smaller opening for engaging
said second sealing means of said outer housing, said inner-housing
defining an inner reservoir in the interior thereof, said inner
housing including a needle mounting tube protruding outwardly at
said second end which forms said smaller opening in said inner
housing;
means to hold said inner and outer housings in such relative axial
positions that their respective first sealing means are in
engagement and their respective second sealing means are in
engagement to form an outer reservoir between said inner and outer
housings, but yet to allow rotational movement between said inner
and outer housings and said inner and outer housings including
means for opening and closing a passage between said inner and
outer reservoirs in response to rotational movement between said
inner and outer housings; and
a plunger inserted into said inner reservoir of said inner housing
through said inner-housing large opening, said plunger including a
tip thereon for engaging the inner surface of said inner housing,
thereby preventing fluid flow in said inner cylinder past said
tip;
the improvement wherein said needle-mounting tube is adapted to
both have a hypodermic needle mounted on a tip thereof and to form
said holding means by being of such a size and shape as to fit
snugly through said smaller opening in said outer housing, said
needle-mounting tube having a bead on the outer surface thereof
which is of such a size, shape and location as to remain in contact
with the outer surface of said outer housing around said smaller
opening to thereby hold said inner and outer housings in said
sealed, rotatable axial positions.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to the art of hypodermic syringes,
and has particular reference to disposable plastic syringes which
may be prefilled in a laboratory with diluent and medicament, in
separate compartments, for subsequent intermixing and use, after
which the syringes may be discarded.
This invention finds particular use in military applications for
emergency treatment under battlefield conditions where a prefilled
syringe may either be self-administered or administered by medical
and non-medical personnel. Such a syringe is prefilled with an
appropriate dry medicament -- an antibiotic, a pain killing serum,
a narcotic, or the like -- and a diluent that must be mixed in
predetermined portions with the medicament. However, the invention
is not limited to military uses and hypodermic syringes embodying
principles of this invention may find use in other fields where
simple one-shot, premeasured injections must be quickly
administered.
There are a variety of patented syringes having two or more
compartments for storing, intermixing and injecting a mixed
medicament and a diluent, some of which are described in: U.S. Pat.
Nos. 553,234 to Finot; 1,154,677 to Wedig; 2,869,543 to Ratcliff et
al; 3,161,195 to Taylor et al; 3,534,734 to Budreck; 3,678,930 to
Schwartz; and 3,680,558 to Kapelowitz.
Of these U.S. Pats. Finot (553,234) describes a syringe wherein a
diluent is stored in an outer chamber and a passageway to an inner
chamber is opened in response to rotation of outer and inner
cylinders. Although having some advantages over other dual
chambered syringes, Finot's syringe assembly, as well as other dual
chambered syringes, has not been widely used. One likely reason for
this is that Finot's passageway between his outer and inner
chambers is defined by sealing members which have the function of
forming a seal between his outer and inner cylinders. Finot's
sealing members are flat and press against one another rather than
intermesh. It is thought that such a system is not only somewhat
complicated but also may not provide a tight seal. Further, Finot's
outer chamber can only be filled by first sucking a charge into his
inner chamber and then transferring it to his outer chamber. This
involves an unduly long amount of time for charging syringes. In
addition, Finot's outer and inner cylinders are held together by
threaded members. Such threaded members are unduly difficult to
manufacture and time consuming to assemble. In this regard it
appears that the cost for manufacturing Finot's syringe would
probably prevent it from being sold as a disposable item.
A dual chambered disposable syringe which may be prefilled in a
laboratory should have the following qualities to be of practical
value:
it should be inexpensive to manufacture;
it should be easily and quickly fillable with a diluent and a
medicament;
it should provide for easy and quick transference of diluent from a
storage reservoir to a plunger reservoir without the diluent or
medicament being unduly exposed to atmosphere; and
it should be easy to assemble, with the parts thereof being
assembled with relatively little effort and in relatively little
time.
It is an object of this invention to provide such a dual chambered
syringe.
SUMMARY OF THE INVENTION
According to principles of this invention a dual chambered syringe
comprises an outer housing enclosing an inner housing. The two
housings defined an outer reservoir between them and an inner
reservoir in the inner housing. There are three ports in the outer
housing and one port in the inner housing. Further, there are
corresponding sealing beads on the outer surface of the inner
housing for covering and uncovering two of the outer-housing ports
and a single sealing bead on the inner surface of the outer housing
for covering and uncovering the inner-housing port. A plug is
provided for plugging and unplugging the third outer-housing
port.
A particular aspect of the syringe assembly is that it is
constructed such that it can be assembled by merely inserting the
inner housing into the outer housing. In this regard, both housings
are constructed of a plastic. The inner housing has a
needle-mounting tube extending from an end thereof which is
inserted through an opening in the end of the outer housing. The
needle-mounting tube has a bead formed on its outer surface which,
in one embodiment, must be forced through the opening in the outer
housing, but which, after passing through the opening, prevents
axial movement between the two housings. In another embodiment the
bead is formed on the needle-mounting tube after it has been
inserted through the opening. Also, an annularly-shaped sealing
ring is formed on the inner surface of the outer housing about the
outer housing opening. Further, an annularly-shaped sealing groove
is formed about the base of the needle mounting tube on the inner
housing for receiving the sealing ring. Thus, a seal is formed to
hold the diluent in the outer reservoir. In addition, a similar
arrangement of sealing elements is provided at the opposite ends of
the housings.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other objects, features and advantages of the
invention will be apparent from the following more particular
description of a preferred embodiment of the invention, as
illustrated in the accompanying drawings in which reference
characters refer to the same parts throughout the different views.
The drawings are not necessarily to scale, emphasis instead being
placed upon illustrating principles of the invention in a clear
manner.
FIG. 1 is an exploded isometric view of a syringe assembly
employing principles of this invention;
FIGS. 2-4 are sectional views of the FIG. 1 syringe assembly, each
view depicting a different phase of operation of the syringe
assembly;
FIG. 5 is a sectional view taken on line 5--5 in FIG. 2;
FIG. 6 is a sectional view taken on line 6--6 in FIG. 3;
and
FIG. 7 is a sectional view taken on line 7--7 in FIG. 4.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings, an inner housing 11, including a
needle-mounting tube 13, is insertable into an outer housing 15;
and a plunger 17, including a rubber tip 19, is insertable into the
inner housing 11. Both the inner and outer housings are constructed
of polypropylene plastic, as is the main body of the plunger
17.
The outer housing 15 has three ports 21 (FIG. 1), 23 (FIG. 2) and
25 (FIG. 1) located at an upper (as seen in FIGS. 1-4 end thereof.
The first and second ports 21 and 23, which serve as breather
ports, are located opposite one another, and the third port 25,
which serves as a filling port, is positioned ninety degrees from
the first and second ports 21 and 23. The third port 25 is
coverable and uncoverable by a plastic plug 27. In this regard, the
plug 27 may be force fitted into the third port 25, however, for
greater security it may be screw fitted.
An outer housing bead 29 protrudes inwardly from the inner surface
of the outer housing 15.
The outer housing 15 has a relatively large opening 31, for
receiving the inner housing 11, at its upper end and a relatively
smaller opening 33 (FIG. 2), through which the needle-mounting tube
13 extends, located at its lower end. Surrounding the outer-housing
large opening 31, and facing axially upwardly is a sealing groove
35. Encircling the smaller opening 33, and protruding axially
inwardly, is a sealing ring 37 (FIG. 2).
A post 39 (FIGS. 1 & 5-7) protrudes inwardly from the inner
surface of the outer housing 15. Both the post 39 and the bead 29
are of polypropylene plastic and may be formed integrally with the
outer housing 15; however, in the preferred embodiment, the bead is
fused or welded to the outer-housing 15 by a method such as sonic
welding.
The inner housing 11 has a single inner-housing port 41 located at
the lower end thereof, the position of the inner-housing port 41
corresponding to the position of the outer-housing bead 29.
Further, the inner housing 11 has two plastic beads 43 and 45
protruding from its outer surface at positions such that they cover
the first and second outer-housing ports 21 and 23 when the
outer-housing bead 29 covers the inner-housing port 41. Again,
these beads may be formed integrally with or fused to the inner
housings 11.
A flange 47 protrudes laterally from the upper end of the inner
housing 11. An annular sealing ring 49 (FIGS. 2-4) protrudes from
the lower surface of the flange 47 and is designed to mesh with the
sealing groove 35 of the outer housing 15. Similarly, an
annularly-shaped sealing grove 51 encircles the base of the
needle-mounting tube 13 and is designed to receive the sealing ring
37 of the outer housing 15.
An annularly shaped bead 53 extends around the outer surface of the
needle-mounting tube 13 and is in one embodiment, designed to be
forced or "popped" through the smaller opening 33 of the outer
housing 15. Thereafter, the annularly-shaped bead 53 retains the
outer and inner housings 15 and 11 against relative axial movement
but allows relative rotational movement between them.
In another embodiment the annularly-shaped bead 53 is formed on the
needle-mounting tube 13 after it has been inserted through the
opening 33 by melting and shaping a portion of the needle-mounting
tube. Similarly, in still another embodiment it is formed by
sonically welding a locking ring in position after assembly.
The rubber plunger tip 19 comprises three sealing members 55 which
define two sealing section 57 and 59. The first sealing section 57
is designed to overlap and backup the seal of the inner-housing
port 41 when the plunger 17 is fully depressed. The second sealing
section 59 designed to provide still another backup seal for
preventing the diluent from reaching a medicament through the inner
housing port 41 (FIGS. 2 and 3). A safety stop 60 is integral with
the plunger 17 to prevent crushing of a medicament 61.
To assemble the syringe assembly depicted in the drawings, the
inner housing 11 is inserted into the outer housing 15 through the
outer-housing large opening 31, until the needle-mounting tube 13
protrudes through the smaller opening 33 at the lower end of the
outer housing 15. Force must be used to "pop" the annularly shaped
bead 53 on the needle-mounting tube 13 through the small opening 33
and once this is accomplished the annularly-shaped bead 53 prevents
relative axial movement and thereby holds the sealing ring 37 in
the sealing groove 51 and the sealing ring 49 in the sealing groove
35. Thus, an outer reservoir 63 is formed between the outer and
inner housings 11 and 15 which is sealed at both ends thereof. It
should be understood that this method of attaching the outer and
inner housings 11 and 15 allows relative rotational movement
between these two members.
Normally, at this time, the outer and inner housings are rotated to
a position where the outer-housing bead 29 covers the inner-housing
port 41 and the first and second inner-housing beads 43 and 45
cover the first and second outer-housing ports 21 and 23.
When it is desired, the medicament 61 is placed inside an inner
reservoir 65, defined by the inner housing 11, and the plunger 17
is inserted into the inner reservoir 65. A cap 66 is mounted on the
end of the needle-mounting tube 13. The syringe assembly is now in
an attitude as is depicted in FIGS. 2 and 5.
Also when desired, liquid diluent is inserted into the third outer
housing filling port 25 by means of a thin, needle-like inserting
device 67 which is sufficiently small that it allows air to escape
around its sides through the third outer-housing port 25. In this
manner the outer reservoir 63 is filled to a point 69 which is
immediately below the third outer-housing port 25. The inserting
device 67 is then removed from the third outer-housing port 25 and
the plug 27 is inserted into the third outer-housing port 25 to
effectively close off this port. At this point the syringe assembly
is fully charged with both medicament and diluent, as depicted in
FIGS. 3 and 6, and is ready for use at an appropriate time.
To use the charged syringe assembly, with reference to FIGS. 4 and
7, the outer and inner housings 11 and 15 are rotated relative to
one another so that the outer-housing bead 29 uncover the
inner-housing port 41 and the first and second inner-housing beads
43 and 45 uncover the first and second outer-housing breather ports
21 and 23. The post 39 limits rotational movement between the outer
and inner housings 11 and 15 as shown in FIG. 7.
The plunger 17 is then withdrawn from the inner reservoir 65, as
shown in FIG. 4, thereby creating a vacuum in the inner reservoir
65. Atmospheric pressure acts through the first and second
outer-housing ports 21 and 23 to transfer the diluent from the
outer reservoir 63 through the inner-housing port 41 into the inner
reservoir 65. The outer and inner housings 11 and 15 are then
rotated in an opposite direction until the outer-housing bead 29
covers the inner-housing port 41 and the first and second
inner-housing beads 43 and 45 cover the first and second
outer-housing ports 21 and 23. At this point the diluent and the
medicament 61 intermix to form a solution to be injected into a
patient. The cap 66 is then removed and replaced with a needle 71
(FIG. 1) which is inserted into the body of a patient. The plunger
17 is then depressed, ejecting the medicine from the inner
reservoir 65 through the needle 71 into the patient.
It should be understood by those skilled in the art that the system
of beads and ports provided in this invention is relatively
uncomplicated but yet provides an effective means of opening and
closing passages between reservoirs and to atmosphere. Further,
these passages are totally separate from the sealing areas so that
they do not inhibit effective operations of seals.
In addition, the provision of a separate charging port which is
coverable and uncoverable by a plug allows the syringe assembly to
be charged with diluent without moving the beads and ports relative
to one another and thereby, perhaps, deforming these elements so
that they cannot later perform their proper function.
In addition, the arrangement of the annularly-shaped bead 53 on the
needle-mounting tube 13, the smaller opening 33 in the outer
housing 15, and the sealing elements 35, 49, 37 and 51, allow
relatively easy and fast assembly of the syringe assembly, but yet
provide effective seals and allow rotation between the
housings.
While the invention has been particularly shown and described with
reference to a preferred embodiment, it will be understood by those
skilled in the art that various changes in form and detail may be
made therein without departing from the spirit and scope of the
invention. For example, this device could be constructed with only
one bead-coverable outer-housing port at the upper end thereof;
however, two breather ports and beads are provided in the preferred
embodiment so that equal and opposite forces of the beads pushing
against the inner housing will offset one another. Further, it
would be possible to dispense with a separate plug-coverable
diluent insertion port since diluent could be inserted through a
bead-coverable port; however, this may require that the inner and
outer housings be rotated relative to one another twice before the
assembly is actually used to administer an injection. Such undue
operation could deform the beads and ports and cause leaks which
could make the syringe assembly inoperable.
In addition, the sealing grooves and rings could have many shapes
other than those disclosed herein.
* * * * *