U.S. patent number 3,688,765 [Application Number 04/863,583] was granted by the patent office on 1972-09-05 for hypodermic injection device.
Invention is credited to Jack S. Gasaway, 2005 Barranca.
United States Patent |
3,688,765 |
|
September 5, 1972 |
HYPODERMIC INJECTION DEVICE
Abstract
A needleless hypodermic device including a body carrying a
compressed-gas cartridge in one end and an ampul of fluid to be
injected at the opposite end, the ampul having a nozzle portion
projecting beyond the body and provided with an aperture of
predetermined size, and having a plunger movable to force the fluid
from the ampul through the aperture. A cylinder in the body carries
a tubular member and is spring-biased toward the cartridge for
penetrating the cartridge and releasing the gas to drive a piston
which, in turn, moves the plunger to exhaust the fluid. A trigger
retains the cylinder in a cocked position until time of use.
Inventors: |
Jack S. Gasaway, 2005 Barranca
(Newport Beach, CA 92660) |
Family
ID: |
25341341 |
Appl.
No.: |
04/863,583 |
Filed: |
October 3, 1969 |
Current U.S.
Class: |
604/70; 124/71;
604/143 |
Current CPC
Class: |
A61M
5/30 (20130101); A61M 5/2053 (20130101) |
Current International
Class: |
A61M
5/30 (20060101); A61M 5/20 (20060101); A61m
005/30 () |
Field of
Search: |
;128/173,173H,218R,218A,272 ;124/11 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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492587 |
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May 1, 1953 |
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CA |
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600186 |
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Jun 1, 1960 |
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CA |
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1095246 |
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Dec 1, 1954 |
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FR |
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879427 |
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Oct 1, 1962 |
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GB3 |
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Primary Examiner: Joseph S. Reich
Attorney, Agent or Firm: Gausewitz & Carr
Claims
I claim
1. A pressure-operated injection device comprising a body, an ampul
carried by said body, a fluid to be injected retained in said
ampul, said ampul having a portion projecting outwardly of said
body, said portion having an aperture therethrough of predetermined
size, a plunger in said ampul remote from said aperture, means for
moving said plunger in said ampul for forcing said fluid through
said aperture for injecting said fluid into an adjacent object,
said means for moving said plunger including a compressed-gas
cartridge, a cylinder, and a piston in said cylinder movable by
said gas, means for releasing gas from said compressed-gas
cartridge and conducting gas into said cylinder, said piston
including means for engaging said plunger and moving said plunger
with said piston, said cylinder being movable relative to said body
between a first position remote from said compressed-gas cartridge
and a second position adjacent said compressed-gas cartridge,
resilient means biasing said cylinder toward said second position,
and releasable means for holding said cylinder in said first
position, said cylinder including means for entering said
compressed-gas cartridge when said cylinder is in said second
position for thereby providing said means for releasing gas from
said compressed-gas cartridge.
2. A device as recited in claim 1 in which said means for entering
said compressed-gas cartridge includes a tubular member
communicating with said cylinder, projecting outwardly therefrom,
and movable with said cylinder, said compressed-gas cartridge
having a frangible portion adjacent said tubular member, said
frangible portion being engageable by said tubular member upon said
movement of said cylinder from said first position to said second
position for severing said frangible portion and causing said
tubular member to enter said compressed-gas cartridge and conduct
said gas from said compressed-gas cartridge to said cylinder.
3. A device as recited in claim 1 in which said body includes two
relatively movable portions, one of said portions including means
engageable with said cylinder when said cylinder is in said second
position for moving said cylinder to said first position upon
movement of said one portion relative to the other of said portions
of said body.
4. A hypodermic device comprising a body, means on said body for
retaining a quantity of compressed gas, said means including a
frangible portion for permitting the escape of said gas, means on
said body for retaining a quantity of fluid to be injected by said
device, said means retaining said fluid having an outlet aperture
for discharging said fluid, and a plunger movable for forcing said
fluid through said aperture, a cylinder on said body, said cylinder
being reciprocative relative to said compressed-gas retaining means
between a first position remote from said compressed gas-retaining
means and a second position adjacent said compressed gas-retaining
means, a tubular means providing communication with the interior of
said cylinder and relatively movable therewith, said tubular means
being engageable with said frangible portion when said cylinder is
moved from said first position to said second position, whereby
said tubular means severs said frangible portion for conducting
said compressed gas to the interior of said cylinder, a piston in
said cylinder, said piston having a portion adjacent said plunger,
said piston being movable by said compressed gas when said
compressed gas is so conducted into said cylinder for moving said
plunger and discharging said fluid through said aperture, resilient
means biasing said cylinder toward said second position, and
releasable detent means for holding said cylinder in said first
position.
5. A device as recited in claim 4 in which said means for retaining
said compressed gas includes a cartridge, said body having a
chamber receiving said cartridge, said chamber having a wall having
an opening adjacent said frangible portion, said tubular means
extending into said opening.
6. A device as recited in claim 4 in which said means for retaining
said fluid includes an ampul, said body including a chamber
substantially complementarily receiving said ampul, whereby said
chamber provides reinforcement for said ampul, said chamber having
an opening therethrough, said ampul having an integral portion
projecting beyond one end of said body through said opening, said
portion of said ampul having said aperture for discharging said
fluid.
7. A device as recited in claim 6 in which said ampul includes a
wall opposite from said plunger, said aperture extending from said
wall to said integral portion of said ampul, said wall being
inwardly tapered toward said aperture for facilitating the flow of
said fluid through said aperture, said plunger having a surface
adjacent said wall which is substantially complementary to said
wall.
8. A device as recited in claim 7 in which said surface and said
wall are substantially semispherical.
9. A device as recited in claim 4 in which said resilient means for
biasing said cylinder toward said second position includes a
compression spring circumscribing said cylinder, said cylinder
having an abutment extending radially outwardly from the periphery
thereof engaged by said compression spring at one end of said
spring, said body having a shoulder engaged by the opposite end of
said compression spring.
10. A device as recited in claim 4 including in addition a
compression spring in said cylinder circumscribing said piston,
said piston having an abutment engaged by one end of said spring,
said cylinder having an abutment engaged by the opposite end of
said spring, whereby said spring urges said piston to a retracted
position away from said plunger.
11. A device as recited in claim 4 in which said cylinder includes
a vent opening through the wall thereof intermediate the ends of
said cylinder, whereby when said piston has traveled a
predetermined distance said vent opening is uncovered for
permitting escape of excess compressed gas through said vent
opening.
12. A device as recited in claim 4 in which said body is in at
least two sections, said sections being movable between a first
position of relative adjacency and a second position of relative
separation, said detent means being carried by one of said
sections, the other of said sections having means engageable with
said cylinder for moving said cylinder therewith to said first
position when said sections are moved to said position of relative
separation for permitting said detent means to engage said cylinder
and retain said cylinder in said first position.
13. A device as recited in claim 12 in which said sections include
bayonet means interconnecting the same for permitting said movement
between said position of relative adjacency and said position of
relative separation, said bayonet means including portions for
holding said sections in said position of relative adjacency.
14. A device as recited in claim 5 in which said body includes a
cap defining at least a portion of said chamber for said cartridge,
said cap being removable from said body.
15. A device as recited in claim 14 in which said body and said cap
include bayonet connecting means for permitting rapid attachment
and release of said cap for installation and removal of said
cartridge.
16. A device as recited in claim 6 in which said body includes a
cap defining at least a portion of said chamber for said ampul,
said cap being removable from said body.
17. A device as recited in claim 16 in which said body and said cap
include bayonet connecting means for permitting rapid attachment
and release of said cap for installation and removal of said ampul.
Description
This invention pertains to hypodermic injection devices.
2. The Prior Art:
It has been recognized that medications and other substances may be
injected beneath the skin without the use of a needle by being
forced through the epidermis in a high-pressure jet. This has
patient acceptance because a needle is not required and the
injection causes little or no pain. Devices which have been
marketed for providing this type of injection, however, have been
large and expensive units adapted to retain large quantities of
medicament for repeated injections. They have not been portable,
nor adapted for self-administration by the patient. Such cumbersome
and expensive units have meant that the use of pressure-injecting
devices has been limited. Some smaller compressed gas-powered
injection devices have been proposed, but they have been relatively
difficult to use and generally somewhat complex and expensive. In
particular, prior devices have lacked a convenient way for
replacement of gas cartridges used for driving the fluid to be
injected, and for providing replacement supplies of medicament.
Sterilization has been a problem, and there has been no
satisfactory way of varying quantities of the fluid to be injected
nor the size of the opening through which the jet is
discharged.
The present invention provides a small, simple and relatively
low-cost pressure hypodermic injecting device which may be
approximately the size of a fountain pen. It is powered by a gas
cartridge, which is readily installed in the device or removed when
it is spent. Similarly, the medicament or other material is in a
self-contained, presterilized, sealed ampul that is disposed of
after each use. The ampul includes a nozzle portion providing a
discharge aperture of the proper size. It contains a measured
amount of fluid, providing an appropriate quantity of whatever
material is to be injected, with a plunger in the ampul sealing its
end and providing the means for forcing the material through the
discharge aperture. The plunger may be positioned at different
depths in the ampul, depending upon the amount of fluid it
contains.
Between the ampul and the gas cartridge is a cylinder that is
reciprocative between a position remote from the cartridge and one
adjacent it. The cylinder carries a tubular member extending
rearwardly therefrom that punctures the cartridge when the cylinder
is moved to the position adjacent the cartridge, causing the gas
from the cartridge to enter the cylinder. This drives a piston in
the cylinder through a stroke which, in turn, forces the plunger to
move the length of the ampul to discharge the material through the
ampul outlet opening. The body of the device reinforces the ampul
structurally, and the ampul and plunger are provided with
semispherical end walls which help direct all of the material from
within the ampule to and through the discharge opening. A spring
biases the cylinder toward the cartridge, while a releasable
trigger holds it in the retracted position until the injection is
to take place.
The device is cocked readily by sliding two sections of the boy of
the device relative to each other, which causes the cylinder to be
moved with one section to its retracted position, while the trigger
device on the other section drops behind an end flange on the
cylinder, holding the cylinder in the retracted position. Bayonet
connections are provided for the two body sections and for the end
caps that hold the cartridge and the ampul. This facilitates
removal of the used ampul and cartridge, loading of replacements,
and the cocking of the device for the next injection. The
simplicity of operation and safety of the device make it adaptable
for use by those requiring self-administered injections. It is not
limited to injection through the skin, but may be used wherever
fluid is to be injected.
BRIEF DESCRIPTION OF THE DRAWING:
FIG. 1 is a plan view of the hypodermic device of this
invention;
FIG. 2 is a longitudinal sectional view taken on line 2--2 of FIG.
1, with the device in the cocked position;
FIG. 3 is a view similar to FIG. 2, but with the device in the
released position; and
FIG. 4 is an enlarged transverse sectional view taken along line
4--4 of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT:
The hypodermic device of this invention includes a body 10 having a
generally cylindrical exterior. At its forward end (to the left as
illustrated) there is a portion 11 of the body 10 which is of
reduced exterior diameter. This portion of the body is received
within the rearward end of a tubular body member 12 having an outer
diameter the same as that of the principal portion of the body 10.
The tubular member 12 is connected to the body 10 by a bayonet
lock, which includes opposed slots through the rearward portion of
the member 12 having longitudinal portions 13 and lateral portions
14 at right angles to the longitudinal portion. Lugs 15 project
radially outwardly from the forward portion of the body 10 into the
bayonet slots.
Within the body 10 is an elongated cylindrical chamber 17, which
receives a tubular cylinder 18 of smaller diameter. A the forward
end 11 of the body 10 is a member 19 having an axial opening 20
that substantially complementarily and slidably receives the
circumferential surface of the cylinder 18. The member 19 includes
a radial flange portion 21 in which is the opening 20. The member
19 extends rearwardly into a recess provided therefor in the
forward end portion 11 and is secured therein by conventional means
such as a force fit as shown, or by threads or the like similar to
that shown at 29. A compression spring 23 circumscribes the
cylinder 18 and bears against the flange 21 interiorly of the
annular portion 21 of the member 19. The opposite end of the spring
23 engages an exteriorly projecting radial flange 24 on the
rearward end of the cylinder 18, thereby biasing the piston 18
rearwardly, or to the right as illustrated.
The forward end of the cylinder 18 extends through an opening 25 in
a radial wall 26 in the tubular member 12 adjacent the member 19,
and is adapted to enter a cylindrical chamber 27. A member 28 at
the forward end of the cylinder 18 in the chamber 27 has an annular
externally threaded portion 29 mating with threads in the forward
interior portion of the cylinder. A radial flange 30 projects
radially outwardly of the threaded portion 29 and beyond the
circumferential surface of the cylinder 18. An axial opening 32
through the member 28 slidably receives an elongated piston 33
extending forwardly from the cylinder 18. Enlarged circular discs
34 and 35 are mounted on the forward end of the piston 33 beyond
the member 28.
At the rearward end of the piston 33 is a pair of spaced radial
flanges 36 and 37 between which is an O-ring 38 providing a seal
with respect to the wall of the cylinder 18. A relatively light
compression spring 39 bears against the flange 36 at one end and
the end of member 28 at the other, thereby biasing the piston 33
toward the right to the position of FIG. 2, where the flange 37
engages the wall forming the cylinder head 40 at the right-hand end
of the cylinder 18.
An axial opening 42 extends through the cylinder head 40 and with a
press fit receives one end of a tubular firing pin 43 that projects
rewardly axially beyond the cylinder 18. The rearward end 44 of the
tubular firing pin 43 is chamfered so that it provides a convergent
outer edge. The firing pin 43 extends into a cylindrical opening 46
through a transverse wall 47 of the body 10 at the rearward end of
the chamber 17. On the opposite side of the wall 47 is a
cylindrical chamber 49 closed at its outer end by a hollow cap
member 50. The latter member extends over a rearward end portion 51
of the body, which is of reduced outside diameter, and has opposed
bayonet slots 52 receiving lugs 53 on the body for locking the cap
50 to the end of the body 10. An O-ring 54 at the inner end of the
cap member 50 provides a seal with respect to the body 10.
Therefore, the chamber 49 is sealed except for the opening 46
through the wall 47.
Within the chamber 49 is a cartridge 56 containing a compressed
gas, such as carbon dioxide. The cartridge 56 includes an end wall
57 adjacent the wall 47 of the body 10, having a frangible axial
portion 58 of reduced thickness located adjacent the convergent end
portion 44 of the firing pin 43.
At the opposite end of the device, the chamber 27, which at its
rearward portion is defined by the tubular member 12, extends also
into a hollow forward closure member 60. The latter member includes
an end wall 61, through which extends an opening 62 at the
longitudinal axis of the injector unit. The member 60 is provided
with opposed lugs 63 which extend into bayonet slots 64 in the
tubular member 12 to attach the member 60 to the member 12. An
O-ring 65 seals the connection between the members 60 and 12.
Within the chamber 27 beyond the end of the piston 33 is an ampul
67, suitably made of glass or plastic. The exterior of the ampul 67
is substantially complementary to the adjacent portions of the
chamber 27 and to the opening 62 through the end wall 61. The ampul
has an integral forward nozzle end portion 68 which extends through
the opening 62 and projects slightly beyond the end wall 61. A
small opening 69 extends through the projecting portion 68 of the
ampul 67, leading to an interior chamber 70, which receives the
medicament or other fluid which is to be expelled upon operation of
the hypodermic device. A removable covering (not shown) may be
included over the nozzle end 68 to maintain it in a sterile
condition.
The chamber 70 includes a thin circumferential wall 71 of circular
cross section and a semispherical forward wall 72. This provides an
inward taper at the nozzle end to the centrally positioned opening
69.
In the rearward portion of the ampul 67 is a plunger 74 having a
semispherical forward section 75 which is opposite from and
complementary to the wall 72 of the ampul 67. The ampul is entirely
filled with the fluid to be injected, there being no air present
beyond the plunger 74. The plunger 74 is provided with annular
grooves 76 to define annular ribs 77 complementary to the
circumferential wall 71 of the ampul and sealingly engage it. The
plunger 74 preferably is of rubber or of a plastic material that
will readily form a seal with the wall 71 of the ampul and retain
the fluid. The outer or rearward end 78 of the plunger 74 presents
a radial surface adjacent the forward end of the piston 33.
A longitudinal slot 80 is provided in the body 10, extending
radially inwardly at its rearward end to the chamber 17. Within the
slot 80 is a detent member 81 rotatable relative to the body 10
about a transverse pin 82. A trigger button 83 projects radially
outwardly beyond the circumferential surface of the body 10 at the
forward end of the member 81 on one side of the pin 82. A small
compression spring 84 is located beneath the forward end of the
member 81, engaging the bottom of the slot 80. This biases the
member 81 in a clockwise direction as the device is shown in FIG.
2. The detent member 81 includes a radially inwardly projecting and
forwardly facing shoulder 85 at its rearward end, on the opposite
side of the pin 82, which extends radially inwardly into the rear
end portion of the chamber 17 and engages the abutment provided by
the rearward surface of the flange 24 on the cylinder 18. This
holds the cylinder 18 in the retracted, leftward position of FIG. 2
against the force of the compression spring 23.
In use of the hypodermic device of this invention, the tip portion
68 of the ampul 67 is placed in contact with the skin where the
injection is to be made. Then the trigger button 83 is depressed,
rotating the detent member 81 in a counter-clockwise direction.
This moves the shoulder 85 away from the flange 24 of the cylinder
18. Consequently, the compression spring 23 drives the cylinder
rearwardly from the position shown in FIG. 2 to that of FIG. 3,
where the flange 24 strikes the wall 47 at the end of the chamber
17. The wall 47 forms an abutment that limits the rearward movement
of the cylinder 18. This movement of the cylinder 18 causes the
beveled end 44 of the tubular firing pin 43 to pierce the wall 58
of the cartridge 56, and the member 43 enters the cartridge. This
provides a path for the compressed carbon dioxide or other gas to
flow out of the cartridge 56 through the tubular member 43 and the
passageway 42 in the cylinder head 40 into the interior of the
cylinder 18. There, the pressurized gas bears against the end of
the piston 33, moving the piston 33 forwardly relative to the
cylinder 18. The forward end of the piston 33 engages the rearward
surface 78 of the plunger 74, pushing the plunger the length of the
ampul 67 to the position of FIG. 3. This drives the medicament or
other fluid from the interior of the ampul 67 through the outlet
opening 69 at a high velocity. The jet of fluid produced in this
manner is injected through the epidermis of the patient.
The fact that the semispherical plunger surface 75 is complementary
to the end wall 72 of the ampul 67, together with the location of
the nozzle opening 69 at the center of the wall 72, helps assure
that the entire contents of the ampul 67 are exhausted as the
piston 33 is driven through its stroke. During the movement of the
plunger 74, the wall of the chamber 27 reinforces the ampul
structurally so that it is not broken by the pressure built up
within it.
When the piston 33 reaches the end of its stroke, its rearward end
passes a radial port 87 in the wall of the cylinder 18. This allows
any excess gas to bleed outwardly through the port 87, into the
chamber 17 and, by way of the slot 80, to the atmosphere. This
vents the unit to atmospheric pressure, and assures that the
compressed gas cannot enter the ampul 67.
After the piston 33 has reached the forward end of its stroke and
the pressure behind it has been relieved, the spring 39 returns the
piston to its retracted position, where it engages the cylinder
head 40. The forward closure member 60 then may be removed by
separating its bayonet connection to the tubular member 12,
allowing the spent ampul to be removed from the open rearward ends
of the member 60 and discarded. A new fully-charged ampul then may
be inserted into the member 60, which is reattached to the forward
end of the tubular member 12.
The device then is recocked for its next use. To accomplish this,
the body 10 and tubular member 12 are given relative rotation to
position the lugs 15 at the forward ends of the longitudinal
portions 13 of the bayonet slots in the member 12, as shown in FIG.
1. Then, the members 10 and 12 are moved axially relative to each
other to partially move the member 12 away from the body member 10.
As this movement takes place, the lugs 15 slide in the longitudinal
portions 13 of the bayonet slots, which limit the amount of
separation of the members 10 and 12. With the cylinder 18 having
been driven rearwardly by the spring 23 to the position of FIG. 3,
the flange 30 of the member 28, which is attached to the cylinder,
is brought into engagement with the end wall 26 of the member 12.
This causes the cylinder 18 to move axially rearwardly with the
member 12 relative to the body member 10. The detent member 81, on
the other hand, is attached to the body member 10, so that there is
longitudinal movement between the cylinder 18 and the detent 81. As
this occurs, the outwardly inclined inner surface 89 at the end of
the detent adjacent the shoulder 85 slides over the edge of the
cylinder flange 24. Ultimately, this movement brings the rearward
end of the flange 24 past the shoulder 85 of the detent 81. The
spring 84 then causes the detent 81 to rotate downwardly in back of
the flange 24, holding the cylinder 18 in the retracted, cocked
position of FIG. 2. After the cylinder has been moved to the cocked
position, the tubular member 12 is moved back onto the body member
10, and the parts are rotated to bring the lugs 15 into the
transverse por-tions 14 of the bayonet slots to hold the members 10
and 12 in their assembled position.
With the cylinder 18 moved back to the cocked position, the tubular
firing pin is removed from the compressed-gas cartridge 56, being
retracted into the opening 46 in the end wall 47 between the
chambers 17 and 49. After this, the bayonet connection for the cap
member 50 is separated so that, upon removal of the cap 50, the
cartridge 56 can be removed. An unused sealed compressed-gas
cartridge then is replaced in the chamber 59 and the cap member 50
is returned to the connected position. The hypodermic device then
is completely ready for reuse.
Knurled portion 90, 91, 92 and 93 are provided on the exteriors of
the members 10, 12, 50 and 60, respectively, to facilitate the
rotational and axial movement given these parts during the
preparation of the device for use. The provisions of a
compressed-gas cartridge for powering the unit and replaceable
sealed ampuls for containing the liquid to be injected, together
with the easily operated bayonet connection and the mechanical
arrangements for the various parts, mean that it is an extremely
simple procedure to make the device ready for reuse. The entire
sequence in operating the device can be accomplished quite easily
and rapidly.
For economy of manufacture, it is preferred to make the ampuls 67
of a single length regardless of the quantity of fluid that is to
be accommodated. For lesser amounts of fluid, the plunger is
initially positioned further into the ampul, still acting as the
rearward closure for retaining the fluid.
The ampuls may be made with different sizes of nozzle openings 69
to suit the viscosity of the fluid retained and the type of
injection that is to be made. Typically, the ampuls may provide
openings of 0.003,0.005 and 0.008 inch diameters. The depth of
penetration will increase with the diameter of the nozzle opening
for a given fluid, while larger diameters are needed for fluids of
greater viscosity. With the nozzle being a part of the replaceable
ampul rather than a portion of the permanent structure of the
injection device, it is a simple matter to provide precisely the
needed size of discharge opening for each injection to be made.
* * * * *