U.S. patent number 3,702,608 [Application Number 05/098,400] was granted by the patent office on 1972-11-14 for painless injection device with powered plunger.
Invention is credited to Robert C. Tibbs.
United States Patent |
3,702,608 |
Tibbs |
November 14, 1972 |
PAINLESS INJECTION DEVICE WITH POWERED PLUNGER
Abstract
An injecting device for a hypodermic syringe including, in a
first form of the invention disclosed, structure for supporting a
syringe and projecting the needle of the syringe into a skin tissue
area against which a predetermined portion of the device has been
placed. Structure is also provided for advancing the plunger of the
syringe relative to the barrel portion thereof after the syringe
has been projected in order to force the needle thereof into the
skin tissue. A second form of the invention includes not only
structure for accomplishing these same functions but also
additional structure for slightly retracting the plunger of the
syringe relative to the barrel portion thereof during the latter
portion of the stroke of the syringe during projection of the
latter as the syringe needle penetrates the adjacent skin tissue to
produce aspiration for detecting whether the needle has penetrated
a blood vessel.
Inventors: |
Tibbs; Robert C. (Cleveland,
MS) |
Family
ID: |
22269116 |
Appl.
No.: |
05/098,400 |
Filed: |
December 15, 1970 |
Current U.S.
Class: |
604/136 |
Current CPC
Class: |
A61M
5/2033 (20130101); A61M 5/422 (20130101); A61M
2005/3112 (20130101); A61M 5/46 (20130101); A61M
2005/206 (20130101) |
Current International
Class: |
A61M
5/20 (20060101); A61M 5/42 (20060101); A61M
5/31 (20060101); A61M 5/46 (20060101); A61m
005/22 () |
Field of
Search: |
;128/218A,218F,218R |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Pace; Channing L.
Parent Case Text
This application comprises a continuation-in-part of my copending
U. S. application Ser. No. 8,366 filed Feb. 3, 1970, for Painless
Injection Device, now U. S. Pat. No. 3,605,742, dated Sept. 20,
1971.
Claims
What is claimed as new is as follows:
1. In combination, a support, a syringe barrel holder mounted on
said support for reciprocal shifting along a predetermined path
relative to said support in opposite first and second directions
for projecting and retracting, respectively, a needle carried by a
syringe mounted on said holder, a syringe plunger holder supported
from said barrel holder for reciprocal shifting along said path
relative to said barrel holder, means yieldingly biasing said
holders in said first direction, first and second deactivatable
means for retaining said barrel and plunger holders, respectively,
against movement in said first direction relative to said support,
said second means including means for yieldingly resisting movement
of said plunger holder in said first direction as said barrel
holder is moved in said first direction.
2. The combination of claim 1 wherein said second means includes
means for freely releasing said plunger holder for movement in said
first direction subsequent to movement of said barrel holder in
said one direction.
3. The combination of claim 2 wherein said support includes surface
means disposed about a target zone centrally through which the free
end of said needle is lengthwise advanced during movement of said
barrel holder in said first direction, and fluid discharge means
carried by said support and operable to discharge fluid toward said
zone from a discharge point spaced in said second direction from
said zone.
4. The combination of claim 1 wherein said barrel holder includes
means for supporting said syringe barrel in adjusted shifted
positions along said path relative to said barrel holder.
5. The combination of claim 1 wherein said plunger holder includes
means for supporting said syringe plunger in adjusted shifted
positions along said path relative to said plunger holder.
6. The combination of claim 5 wherein said barrel holder includes
means for supporting said syringe barrel in adjusted shifted
positions along said path relative to said barrel holder.
7. In combination, a support, a syringe barrel holder on said
support for reciprocal shifting along a predetermined path relative
to said support in opposite first and second directions for
projecting and retracting, respectively, a needle carried by a
syringe mounted on said holder, a syringe plunger holder supported
from said barrel holder for reciprocal shifting along said path
relative to said support, means yieldingly biasing said holders in
said first direction, and first and second deactivatable means for
retaining said barrel holder and plunger holder against movement in
said first direction relative to said support and barrel holder,
respectively, said support including surface means disposed about a
target zone centrally through which the free end of said needle
supported from a hypodermic barrel carried by said barrel holder is
lengthwise advanced during movement of said barrel holder in said
first direction, and fluid discharge means carried by said support
and operable to discharge fluid toward said zone from a discharge
point spaced in said second direction from said zone.
8. In combination, a support, a syringe barrel holder mounted on
said support for reciprocal shifting along a predetermined path
relative to said support in opposite first and second directions
for projecting and retracting, respectively, a needle carried by a
syringe mounted on said holder, a syringe plunger holder supported
from said barrel holder for reciprocal shifting along said path
relative to said plunger holder, means yieldingly biasing said
holders in said first direction, and first and second deactivatable
means for retaining said barrel holder and plunger holder against
movement in said first direction relative to said support and
plunger holder, respectively, the first mentioned means including
first and second spring means operatively connected between said
support and barrel holder and between said barrel holder and
plunger holder, respectively, said support including surface means
disposed about a target zone centrally through which the free end
of said needle is lengthwise advanced during movement of said
barrel holder in said first direction, and fluid discharge means
carried by said support and operable to discharge fluid toward said
zone from a discharge point spaced in said second direction from
said zone.
9. In combination, a support, a syringe barrel holder mounted on
said support for reciprocal shifting along a predetermined path
relative to said support in opposite first and second directions
for projecting and retracting, respectively, a needle carried by a
syringe mounted on said holder, a syringe plunger holder supported
from said barrel holder for reciprocal shifting along said path
relative to said barrel holder, means yieldingly biasing said
holders in said first direction, first and second deactivatable
means for retaining said barrel and plunger holders, respectively,
against movement in said first direction relative to said support,
said barrel holder including means for supporting said syringe
barrel in adjusted shifted positions along said path relative to
said barrel holder.
10. In combination, a support, a syringe barrel holder mounted on
said support for reciprocal shifting along a predetermined path
relative to said support in opposite first and second directions
for projecting and retracting, respectively, a needle carried by a
syringe mounted on said holder, a syringe plunger holder supported
from said barrel holder for reciprocal shifting along said path
relative to said barrel holder, means yieldingly biasing said
holders in said first direction, first and second deactivatable
means for retaining said barrel and plunger holders, respectively,
against movement in said first direction relative to said support,
said plunger holder including means for supporting said syringe
plunger in adjusted shifted positions along said path relative to
said plunger holder.
11. The combination of claim 10 wherein said barrel holder includes
means for supporting said syringe barrel in adjusted shifted
positions along said path relative to said barrel holder.
Description
This invention relates to hypodermic injection of fluids through
the needle of a plunger operated syringe and more specifically to a
new and useful support, projecting and operating device for
hypodermic syringes specifically designed to minimize pain,
discomfort and psychological trauma commonly associated with
hypodermic syringes. The invention provides means for not only
supporting and projecting a hypodermic syringe toward skin tissue
to be injected subsequent to the external surface of the injection
site being desensitized, but also includes operating features
whereby aspiration may be produced and subsequent advancement of
the plunger relative to the barrel portion of the syringe may be
gradually accomplished in a smooth even manner by mechanical
means.
The present invention consists of a mechanical device operable to
removably receive and support a conventional type of hypodermic
syringe, preferably of the disposable type, and to support the
syringe for mechanical projection over a given distance, aspiration
of the syringe during the latter part of the projection stroke
thereof and subsequent advancement of the plunger portion of the
syringe in order to enable a medical technician or physician to
inject fluids into the subcutaneous and muscular tissues under the
skin of a patient by a more desirable method. Thus, the injection
device of the present invention embodies various desirable
injection techniques which prior art devices do not incorporate in
a single instrument.
In accordance with the present invention, a conventional hypodermic
syringe is inserted through an access opening provided therefor in
an elongated housing with the barrel of the syringe being received
within a slidable holder for projecting the syringe and the needle
supported therefrom by spring operated means through a skin tissue
surface engaging end of the housing. A latch mechanism is provided
and operable to retain the holder in a cocked retracted position
with the hypodermic needle completely enclosed within the housing
and upon release of the latch mechanism, the holder and the syringe
with its supported needle is rapidly advanced to a limit position
with the needle projecting outwardly of the skin tissue or surface
engaging end of the housing. A slidable holder for the enlarged
free end of the piston of the hypodermic syringe is also slidably
mounted in the housing and engaged with the enlarged end of the
piston. The piston holder is coupled to an anchor member by
elastically extensible means and final movement of the syringe
barrel or cylinder and the needle supported therefrom to its fully
projected position is coupled with relative movement between the
syringe barrel and piston whereby aspiration is produced. Further,
the anchor for the syringe piston is also slidable in the housing
and is spring operated and provided with its own latch mechanism
for its retention in a cocked retracted position whereby release of
the anchor latch mechanism will serve to advance the syringe piston
in order to discharge the fluid contents of the syringe through the
needle thereof.
The end surface of the housing through which the needle of the
syringe is projectable defines an outwardly opening recess and the
discharge nozzle of a compressed gas chamber is communicated with
the recess for discharging expanding, and thus heat absorbing, gas
into the recess for desensitizing the skin tissue area with which
the needle of the hypodermic syringe is aligned prior to projection
of the syringe and the needle supported therefrom.
The main object of this invention is to provide a mechanical
support apparatus for a hypodermic syringe operable to initially
support the syringe with its needle closely adjacent an injection
site and to thereafter function to project the syringe toward the
injection site for penetration of the needle of the syringe into
the injection site skin tissue.
Another object of this invention, in accordance with the
immediately preceding object, is to provide an apparatus which,
during final movement of the supported syringe toward the injection
site, will be operative to effect aspiration of the hypodermic
syringe.
Yet another object of this invention is to provide an apparatus in
accordance with the preceding objects and which will be operable,
after aspiration of the syringe, to mechanically advance the piston
portion of the syringe in order to discharge the liquid contents
thereof through the needle of the syringe.
These together with other objects and advantages which will become
subsequently apparent reside in the details of construction and
operation as more fully hereinafter described and claimed,
reference being had to the accompanying drawings forming a part
hereof, wherein like numerals refer to like parts throughout, and
in which:
FIG. 1 is a perspective view of the invention as seen from the
exterior thereof;
FIG. 2 is an enlarged fragmentary elevational view of the invention
as seen from the back side of FIG. 1;
FIG. 3 is an enlarged fragmentary vertical sectional view of the
hypodermic syringe supporting and operating portion of the
invention;
FIG. 4 is an enlarged horizontal sectional view taken substantially
upon a plane indicated by the section line 4--4 of FIG. 3;
FIG. 5 is an enlarged horizontal sectional view taken substantially
upon the plane indicated by the section line 5--5 of FIG. 3;
FIG. 6 is a fragmentary enlarged vertical sectional view taken
substantially upon the plane indicated by the section line 6--6 of
FIG. 2;
FIG. 7 is an enlarged fragmentary vertical sectional view taken
substantially upon the plane indicated by the section line 7--7 of
FIG. 2;
FIG. 8 is a perspective view of some of the disassembled parts
associated with the invention and with a disposable type hypodermic
syringe in exploded position;
FIG. 9 is a vertical sectional view similar to FIG. 3 but of a
modified form of the invention;
FIG. 10 is a fragmentary perspective view of the upper portion of
the housing of the modified form of the invention as seen from the
rear of FIG. 9;
FIG. 11 is an enlarged fragmentary vertical sectional view taken
substantially upon the plane indicated by the section line 11--11
of FIG. 10;
FIG. 12 is a horizontal sectional view taken substantially upon the
plane indicated by the section line 12--12 of FIG. 10; and
FIG. 13 is a perspective view of some of the disassembled parts
associated with the modified form of the invention.
Referring now more specifically to the drawings, the numeral 10
generally designates a vertically elongated housing including front
and rear walls 12 and 14, top and bottom walls 16 and 18 and
opposite side walls 20 and 24.
The front wall 12 has an access opening 26 formed therein provided
with a hinged closure 28 including an inwardly projecting guide
abutment 30 on its inner surface, see FIG. 5. The side wall 22 has
an upstanding slot 32 formed therein and the interior of the
housing 10 includes a front to rear extending partition 34 dividing
the interior of the housing 10 into first and second compartments
36 and 38. The top wall 16 has an access opening (not shown) formed
therein closed by removable plug 40 and access to the compartment
or chamber 36 may be gained by removal of the plug 40. The chamber
36 is designed to receive a pressurized container such as that
disclosed in my co-pending U. S. application Ser. No. 8,366 and
accompanying means is provided for opening the outlet valve of such
a container to direct a discharge of the pressurized fluid therein
through the passageway or port 42 which communicates with an
opening 44 formed through that portion of the bottom wall 20
defining the bottom of the chamber 38 whereby the discharged fluid
will be directed toward the zone 46 of the skin tissue 48 against
which the bottom wall 20 of the housing 10 is placed preparatory to
injection operations, see FIG. 3.
With attention now invited more specifically to FIG. 8 of the
drawings, there may be seen a conventional form of disposable
syringe referred to in general by the reference numeral 50. The
syringe 50 includes a barrel 52 having diametrically opposite
finger engaging tabs 54 at one end and supporting a hypodermic
needle 56 at its other end. A syringe piston or plunger 58 is
telescoped into the end of the barrel 52 remote from the needle 56
and also includes diametrically opposite finger engageable tabs
60.
A syringe barrel holder referred to in general by the reference
numeral 62 is slidably disposed in the compartment or chamber 38
and includes an outwardly projecting finger engageable tab or
projection 66 on its upper end which is slidably received in the
slot 32. The front side of the syringe barrel holder 62 is provided
with a forwardly opening through slot 68 and vertically spaced
internal grooves 70 are also formed in the holder 62 and open into
the slot 68. The barrel 52 is receivable in the slot 68 with the
tabs 54 received within one of the grooves 70 and the lower end of
the holder 62 is provided with a resilient end member 72 for
butting the inner upwardly facing surface 74 of the bottom wall 20
about the upper end of the opening 44.
The sides of the holder 62 include vertical slots 76 in which the
upper ends of a pair of expansion springs 78 are anchored by means
of pins 80 and the lower ends of the expansion springs 78 are
anchored in the bottom wall 20 as at 82. Thus, the holder 62 is
yieldingly biased downwardly in the chamber or compartment 38 and
the guide abutment 30 guidingly engages the barrel 52 of the
syringe 50 during its vertical movement in the housing 10.
The rear side of the holder 62 has a vertically extending groove 86
formed therein provided with downwardly facing ratchet teeth 88,
see FIGS. 4 and 7 and a holder latching lever 90 is pivotally
supported from the rear wall 14 as at 92 and includes a dog tooth
94 projectable through an opening 96 in the rear wall 14 for
engagement with the teeth 88 in order to releasably retain the
holder 62 in a raised retracted or cocked position against the
biasing action of the springs 78.
A syringe plunger holder 98 is also slidably supported within the
chamber or compartment 38 in an upper portion thereof and includes
an outwardly extending projection 100 which is also slidably
received in the slot 32. The holder 98 is provided with a forwardly
and downwardly opening recess 102 in which an anchor block 104 is
slidingly received for vertical shifting relative thereto and the
holder 98 includes opposite side upstanding grooves 106, see FIG. 4
and 8 which are vertically registered with corresponding grooves
108 formed in the upper portion of the holder 62. A pair of
elongated expansion springs 110 have their upper and lower ends
received in the grooves 106 and 108, respectively, and the upper
ends of the springs 110 are anchored in the upper ends of the
grooves 106 by means of pins 112 while the lower ends of the
springs 110 are anchored to the side wall 32 as at 114 and the
partition 34 as at 116, see FIG. 3.
The rear wall 14 has a second opening 118 formed therein and a
locking lever 120 is pivotally supported from the rear wall 14 as
at 122 and includes a dog end 124 projectable through the opening
118 for engagement with downwardly opening ratchet teeth 126 formed
in a groove 128 in the rear side of the holder 98. The rear side of
the holder 98 includes a further deeper groove 130 registered with
the groove 86 and in which the dog 94 is received when the holder
98 moves downwardly in the compartment 38 in registry with the dog
94.
The abutment block 104 includes opposite side grooves 132 in which
all but the upper ends of a pair of short expansion springs 134 are
received and the lower ends of the springs 134 are anchored in the
lower ends of the grooves 132 by means of pins 136 while the upper
ends of the springs 134 are anchored to the upper wall 138 of the
holder 98 as at 140. In addition, from FIG. 3 and 8 of the
drawings, it may be seen that the abutment block 104 defines a
downwardly and forwardly opening slot 142 provided with vertically
spaced pairs of inner grooves 144 for receiving the tabs 60 of the
plunger or piston 58.
In operation, after the proper amount of fluid has been drawn into
the barrel 52 of the syringe 50, the closure 28 is opened and the
syringe 50 is placed within the housing 10 with the barrel 52
having its tabs 54 supported from a selected groove 70 after both
the holder 62 and the holder 98 have been upwardly displaced toward
and latched in retracted positions. Of course, the tabs 60 of the
piston or plunger 58 are received in a corresponding pair of the
grooves 144. Then, the closure 28 may be closed so as to engage the
free end of the guide abutment 30 with the barrel 52. Thereafter,
the housing 10 has its end wall 20 applied to the skin or tissue 48
about the zone 26 and suitable quantities of desensitizing fluid
may be discharged through the passage 42 into the opening 44 so as
to desensitize the tissue in the zone 46. Thereafter, the locking
lever 90 have its upper end displaced inwardly toward the rear wall
14 whereupon the holder 62 will be released for downward movement
under the biasing action of the spring 78 to project the syringe
downwardly 50 until the resilient end member 72 abuts the inner
surface of the end wall 20 and the needle 56 has penetrated the
tissue 48 to the desired depth.
Inasmuch as the piston or plunger 58 is frictionally received
within the barrel 52 and a partial vacuum is created within the
barrel 52 below the plunger 58 to resist upward movement of the
plunger 58 relative to the barrel 52, initial downward movement of
the barrel 52 tends to carry the plunger 58 downwardly with the
barrel 52 independently of any relative movement between the
plunger 58 and the barrel 52. However, downward movement of the
plunger 58 causes downward movement of the abutment block 104 and
thus expansion of the springs 134. Initial expansion of the spring
134 is ineffective to cause relative displacement between the
plunger 58 and the barrel 52. Thus, inasmuch as the tip of the
needle 56 is initially positioned immediately above the tissue 48,
the needle tip penetrates the tissue 48 during initial downward
movement of the holder 62 and before any relative movement between
the plunger 58 and barrel 52 can occur. However, as the barrel 52
is displaced downwardly toward its lower limit position, the
increase in the tension of the springs 134 is sufficient to cause
the plunger 58 to lag behind the barrel 52 in its downward movement
and therefore aspiration of the syringe occurs in order that
logging of the tip of the needle 56 within a vein may be readily
observed through the viewing window 146 formed in the closure 28 as
blood is drawn into the needle end of the transparent barrel
52.
Subsequent to downward movement of the holder 62 to its limit
position and the resultant aspiration of the syringe 50, the lever
120 may have its free end urged toward the rear wall 14 thereby
enabling downward movement of the holder 98 in the compartment 38
under the biasing action of the springs 110 whereupon the upper
wall 138 of the holder 98 will contact the upper surface 148 of the
abutment block 104 to urge the latter, and the plunger 58 supported
therefrom, downwardly within the housing 10 relative to the holder
62 and barrel 52. This of course will cause the fluid within the
barrel 52 to be injected through the needle 56.
With attention now invited more specifically to FIGS. 9-13 of the
drawings, there will be seen a modified form of the invention
including many components which are similar to that form of the
invention illustrated in FIGS. 1-8 and which therefore are
designated by corresponding prime reference numerals.
The holder 62' disposed in the compartment 28' of the housing 10'
includes a syringe barrel receiving slot 68' provided with internal
grooves 70' and thus is capable of supporting the syringe 50'
corresponding to the syringe 50.
However, the holder 62' includes an upper extension defining an
upwardly opening guide compartment 63 in which an abutment member
104' provided with opposite side grooves 105 is slidably received.
The side walls of the upwardly extended portion of the holder 62'
defining the compartment or chamber 63 are provided with shallow
grooves 107 with which the lower ends of the grooves 105 are
registered and in which the lower ends of a pair of expansion
springs 109 are anchored as at 111. The upper ends of the springs
109 are anchored in the upper ends of the grooves 105 by means of
anchor pins 113 and the undersurface 115 of the abutment block 104'
abuts the upper end of the plunger 58'.
The rear wall 14' of the housing 10' has an opening 96' formed
therethrough and a locking lever 90' is pivotally supported from
the rear wall 14' as at 92' and includes a dog end 94' projectable
through the opening 96' and engageable with the downwardly opening
ratchet teeth 88' formed in the holder 62'. A pair of expansion
springs 78' have their upper ends received in grooves 76' formed in
the holder 62' and anchored to the holder 62' as at 80' whereupon
the holder, except when held in a cocked position by means of the
locking lever 90', is spring urged downwardly by the springs 78'.
In addition, the abutment block 104' is provided with downwardly
facing ratchet teeth 126' engageable by a dog end 124' of a lever
120' pivotally supported from the holder 76' as at 122'. The rear
wall 14' additionally includes a slot 127 therein through which the
lever 120' is slidable, see FIG. 12. Accordingly, while the housing
10' may also be provided with desensitizing means such as that
disclosed in my co-pending U. S. application Ser. No. 8,366,
operation of the form of the invention illustrated in FIGS. 9-13 is
generally similar to that form of the invention illustrated in
FIGS. 1-8. The housing 10' has its end wall 20' placed against skin
tissue which is to be penetrated by the needle 56' of the syringe
50 after the holder 62' and the abutment block 104' have been
latched in their retracted positions and the syringe 50' has been
supported from the holder 62'. Thereafter, the contact zone to be
penetrated by the needle 56' may be desensitized and the lever 90'
may have its free end urged toward the rear wall 14' in order to
release the holder 62' before downward movement under the biasing
action of the spring 78' so as to penetrate the tissue with the
needle 56'. Of course, inasmuch as the abutment block 104' is
coupled to the holder 62' through the latch 120', the abutment
block 104', holder 62', syringe barrel 52' and plunger 58' all move
downward without relative rotation occurring therebetween. After
the holder 62' has reached its lowermost limit position, the free
end of the lever 120' may be urged toward the rear wall 14' so as
to release the abutment block 104' for downward movement relative
to the holder 62' under the biasing action of the springs 109. This
of course will cause the plunger 58' to be shifted relative to the
barrel 52' and thus the fluid within the barrel 52' to be injected
through the needle 56'.
The foregoing is considered as illustrative only of the principles
of the invention. Further, since numerous modifications and changes
will readily occur to those skilled in the art, it is not desired
to limit the invention to the exact construction and operation
shown and described, and accordingly all suitable modifications and
equivalents may be resorted to, falling within the scope of the
invention.
* * * * *