Medical syringe abstract
A medical syringe has a plunger bore (1 and 2) that is flexible.
A hermetically-sealed glass ampule (3) containing a drug in the
form of a liquid referred to generally as a sterile preparation
(4) is placed in the plunger bore (1 and 2). When the plunger (1)
is pulled outwardly a select distance to expose the flexible plunger
bore (2), the glass ampule (3) is broken by hand-squeezing the plunger
bore (2) against it. Liquid preparation (4) from the glass ampule
(3) is directed through a check-valved orifice (16) at a tip of
a resilient piston section (21) of the plunger (1). At the check-valved
orifice (16), the preparation (4) enters into a syringe bore (6).
There the preparation (4) can be injected through a conventional
luer (38-40) and hypodermic needle (37) by the standard practice
of depressing the plunger (1) into the syringe (7). Variations are
provided for storing ampules of preparation either in or separately
from the syringe. Embodiments are described for various adaptations.
Use methods are described.
Medical syringe claims
What is claimed is:
1. An ampule-container syringe having:
a syringe barrel with a syringe bore and a sealable luer, said
bor having an injection conveyance in fluid communication with said
sealable luer for attaching hypodermic needles at an injection end
and suitable gripping means at a plunger-receiving end with a plunger-receiving
orifice;
a syringe plunger defining an axis and insertable into the syringe
bore through the plunger receiving orifice;
said plunger including a hollow plunger shaft having flexible walls
defining a plunger bore sized and shaped to receive desired sizes
and shapes of ampules in desired size relationships between the
plunger bore and the ampules;
a plunger tip in sliding-seal relationship to inside peripheral
walls of the syringe bore;
a plunger tip port having a one-way valve in one-way-valved relationship
to flow of fluid from inside of the hollow plunger into the syringe
bore;
suitable plunger gripping means and an ampule-insertion orifice
at a handle end of the syringe plunger; and
a restraining means associated with said plunger for preventing
escape of an ampule positioned in the hollow plunger shaft.
2. An ampule-container syringe according to claim 1 and further
comprising:
a plunger piston section constructed of appropriately resilient
material at the tip end of the syringe plunger;
a sliding-seal ring on the plunger piston section; and
a piston fluid conveyance in communication between the plunger
bore and the tip port.
3. An ampule-container syringe according to claim 1 and further
comprising:
a filter positionable between the plunger bore and the tip port.
4. An ampule-container syringe according to claim 3 and further
comprising:
a plunger piston section constructed of appropriately resilient
material at the tip end of the syringe plunger;
a sliding-seal ring on the plunger piston section; and
a piston fluid conveyance in communication between the plunger
bore and the tip port.
5. An ampule-container syringe according to claim 4 wherein the
filter is in the form of a cylindrical wafer positioned proximate
an entrance to the piston fluid conveyance.
6. An ampule-container syringe according to claim 4 wherein the
filter is in the form of a cylinder positioned snugly inside of
the piston fluid conveyance.
7. An ampule-container syringe according to claim 4 wherein a select
portion of the piston fluid conveyance is comprised of a plurality
of suitably small-diameter conveyance passages.
8. An ampule-container syringe according to claim 4 and further
comprising:
a plunger-latch notch positioned circumferentially proximate the
plunger tip section on the syringe plunger; and
a plunger latch positioned proximate the plunger-receiving end
of the syringe engageable with the plunger-latch notch.
9. An ampule-container syringe according to claim 8 wherein the
plunger latch is a lever arm constructed of resilient material with
one end anchored to an outside peripheral portion on the syringe
barrel and the opposite end having a lever angular member, said
syringe barrel having an orifice therein, said lever angular member
insertable through said orifice and into the latch notch when the
syringe plunger is in a desired position in relationship to the
plunger-receiving orifice in the plunger receiving end of the syringe.
10. An ampule-container syringe according to claim 9 wherein the
plunger latch is biased outwardly from the syringe barrel.
11. An ampule-container syringe according to claim 9 wherein the
plunger latch is biased inwardly towards the syringe barrel and
further comprising:
a proximal edge of the latch notch that is perpendicular to the
axis of the plunger; and
a distal edge of the latch notch which in combination with a proximal
edge of the latch notch forms a suitably latch-raising angle of
approximately 45 degrees from perpendicularity to the axis of the
plunger.
12. An ampule-container syringe according to claim 1 wherein the
restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft is a plunger-bore plate positionable
in covering relationship to the plunger bore at the opposite end
of the plunger shaft from the plunger tip.
13. An ampule-container syringe according to claim 12 and further
comprising:
a pressure-equalizer orifice in the plunger-bore plate.
14. An ampule-container syringe according to claim 13 and further
comprising:
a pressure-equalizer-orifice cover positionable on the plunger-bore
plate in sealing relationship to the pressure-equalizer orifice.
15. An ampule-container syringe according to claim 14 and further
comprising:
a free-piston seal in sliding-seal relationship to inside linear
walls of the plunger bore and positionable between the plunger-bore
plate and an ampule placed in the plunger bore to provide a sanitary
seal against contamination by airborne contaminants in air entering
the plunger bore through the pressure-equalizer orifice.
16. An ampule-container syringe according to claim 15 wherein the
restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft is a breakable plate constructed of
material such as glass which breaks with dislodgement attempts in
order to prevent subsequent use of the ampule-container syringe.
17. An ampule-container syringe according to claim 15 wherein the
restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft is an attachable plunger lid such that
ampules of sterile preparations can be stored separately from ampule-container
syringes and then placed in plunger bores of the plunger shafts
and the plunger lids are attached when the ampule-container syringe
is used.
18. An ampule-container syringe according to claim 14 and further
comprising:
a balloon seal with entrance orifice surrounding the pressure-equalizer
orifice and attached to an inside wall of the plunger-bore plate.
19. An ampule-container syringe according to claim 14 wherein the
restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft is a breakable plate constructed of
material such as glass which breaks with dislodgement attempts in
order to prevent subsequent use of the ampule-container syringe.
20. An ampule-container syringe according to claim 14 wherein the
restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft is an attachable plunger lid such that
ampules of sterile preparations can be stored separately from ampule-container
syringes and then placed in plunger bores of the plunger shafts
and the plunger lids attached when the ampule-container syringe
is used.
21. An ampule-container syringe according to claim 1 wherein the
restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft is a breakable plate constructed of
material such as glass which breaks with dislodgement attempts in
order to prevent subsequent use of the ampule-container syringe.
22. An ampule-container syringe according to claim 1 wherein the
restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft is an attachable plunger lid such that
ampules of sterile preparations can be stored separately from ampule-container
syringes and then placed in plunger bores of the plunger shafts
and the plunger lids are attached when the ampule-container syringe
is used.
23. An ampule-container syringe according to claim 1 and further
comprising:
a preparation-containing ampule sized and shaped to fit in desired
relationship to inside dimensions of the bore of the syringe plunger
and having an outside wall comprised of segmented components of
a desired shape with thin-walled break channels between the segmented
components.
24. An ampule-container syringe according to claim 23 wherein the
segmented components are rectangular-shaped and have curved and
smooth edges.
25. An ampule-container syringe according to claim 1 and further
comprising:
a plunger piston section constructed of appropriately resilient
material at the tip end of the syringe plunger;
a sliding-seal ring on the plunger piston section;
a piston fluid conveyance in communication between the plunger
bore and the tip port;
a filter positionable between the plunger bore and the tip port;
a portion of the piston fluid conveyance being comprised of a plurality
of suitably small-diameter conveyances;
a plunger-latch notch positioned circumferentially proximate the
plunger tip section on the syringe plunger;
a plunger latch positioned proximate the plunger-receiving end
of the syringe engageable with the plunger-latch notch;
the plunger latch being a lever arm constructed of resilient material
with one end anchored to an outside peripheral portion on the syringe
barrel and the opposite end having a lever angular member, said
syringe barrel having an orifice therein, said lever angular member
insertable through said orifice and into the latch notch when the
syringe plunger is in a desired position in relationship to the
plunger-receiving orifice in the plunger receiving end of the syringe;
the plunger latch being biased outwardly from the syringe barrel;
the restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft being a plunger-bore plate positionable
in covering relationship to the plunger bore at the opposite end
of the plunger shaft from the plunger tip;
a pressure-equalizer orifice in the plunger-bore plate; and
a pressure-equalizer-orifice cover positionable on the plunger-bore
plate in sealing relationship to the pressure-equalizer orifice.
26. An ampule-container syringe according to claim 25 and further
comprising:
a free-piston seal in sliding-seal relationship to inside linear
walls of the plunger bore and positionable between the plunger-bore
plate and an ampule placed in the plunger bore to provide a sanitary
seal against contamination by airborne contaminants in air entering
the plunger bore through the pressure-equalizer orifice.
27. An ampule-container syringe according to claim 1 and further
comprising:
a plunger piston section constructed of appropriately resilient
material at the tip end of the syringe plunger;
a sliding-seal ring on the plunger piston section;
a piston fluid conveyance in communication between the plunger
bore and the tip port;
a filter positionable between the plunger bore and the tip port;
a portion of the piston fluid conveyance being comprised of a plurality
of suitably small-diameter passageway conveyances;
a plunger-latch notch positioned circumferentially proximate the
plunger tip section on the syringe plunger;
a plunger latch positioned proximate the plunger-receiving end
of the syringe engageable with the plunger-latch notch;
the plunger latch being a lever arm constructed of resilient material
with one end anchored to an outside peripheral portion on the syringe
barrel and the opposite end having a lever angular member, said
syringe barrel having an orifice therein, said lever angular member
insertable through said orifice and into the latch notch when the
syringe plunger is in a desired position in relationship to the
plunger-receiving orifice in the plunger receiving end of the syringe;
the restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft being an attachable plunger lid such
that ampules of sterile preparations can be stored separately from
ampule-container syringes and then placed in plunger bores of the
plunger shafts and the plunger lids are attached when the ampule-container
syringe is used;
a pressure-equalizer orifice in the plunger-bore plate; and
a pressure-equalizer-orifice cover positionable on the plunger-bore
plate in sealing relationship to the pressure-equalizer orifice.
28. An ampule-container syringe according to claim 1 and further
comprising:
metallic plates on the inside periphery of and linear to the axis
of the syringe plunger.
29. An ampule-container syringe according to claim 1 and further
comprising:
a mallet sized and shaped for inserting into the plunger for selectively
breaking the ampule.
30. A method for using an ampule-container syringe consisting of:
a syringe barrel with a syringe bore having an injection conveyance
in fluid communication with a sealable luer for attaching hypodermic
needles at an injection end and suitable gripping means at a plunger-receiving
end with a plunger-receiving orifice;
a syringe plunger insertable into the syringe bore through the
plunger receiving orifice;
a hollow plunger shaft having flexible walls defining a plunger
bore sized and shaped to receive desired sizes and shapes of ampules
in desired size relationships between the plunger bore and the ampules;
a plunger tip in sliding-seal relationship to inside peripheral
walls of the syringe bore;
a tip port having a one-way valve in one-way valved relationship
to flow of fluid from inside of the hollow plunger into the syringe
bore;
suitable plunger gripping means and an ampule-insertion orifice
at a handle end of the syringe plunger; and
a restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft;
comprising the following steps:
positioning an ampule containing sterile preparation in a plunger-shaft
bore of the syringe;
sealing the plunger-shaft bore with a breakable retaining cover;
storing the sterile preparation in the syringe bore of the syringe
plunger of the syringe until a desired time before use;
positioning the syringe plunger in relationship to the syringe
barrel such that a desired portion of flexible walls of the plunger
shaft are exposed outside of the syringe bore;
positioning the syringe with the sealable luer in sealed condition
lower than the plunger-bore plate;
hand-squeezing the flexible walls of the plunger shaft sufficiently
to break the ampule within the plunger-shaft bore;
removing a pressure-equalizer cover from the plunger-bore plate;
allowing the sterile preparation to flow from the broken ampule
into the syringe bore by means of a vacuum in the syringe bore and
in the plunger bore in negative-pressure relationship to a fluid
head of the sterile preparation;
reversing position of the syringe to where the sealable luer is
above the plunger-bore plate;
unsealing the sealable luer,
attaching a hypodermic needle to the sealable luer;
aspirating the syringe;
injecting the sterile preparation from the syringe as desired;
and
discarding the syringe appropriately.
31. A method for using an ampule-container syringe consisting of:
a syringe barrel with a syringe bore having an injection conveyance
in fluid communication with a sealable luer for attaching hypodermic
needles at an injection end and suitable gripping means at a plunger-receiving
end with a plunger-receiving orifice;
a syringe plunger insertable into the syringe bore through the
plunger receiving orifice;
a hollow plunger shaft having flexible walls defining a plunger
bore sized and shaped to receive desired sizes and shapes of ampules
in desired size relationships between the plunger bore and the ampules;
a plunger tip in sliding-seal relationship to inside peripheral
walls of the syringe bore;
a tip port having a one-way valve in one-way valved relationship
to flow of fluid from inside of the hollow plunger into the syringe
bore;
suitable plunger gripping means and an ampule-insertion orifice
at a handle end of the syringe plunger;
a restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft;
the restraining means for preventing escape of an ampule positioned
in the hollow plunger shaft being an attachable plunger lid such
that ampules of sterile preparations can be stored separately from
ampule-container syringes and then placed in plunger bores of the
plunger shafts and the plunger lids are attached when the ampule-container
syringe is used;
comprising the following steps:
storing sterile preparation in an ampule separately from the ampule-container
syringe;
positioning an ampule containing sterile preparation in a plunger
bore at a desired time before use of the sterile preparation;
sealing the plunger-shaft bore with the attachable plunger lid;
positioning the syringe plunger in relationship to the syringe
barrel such that a desired portion of flexible walls of the plunger
shaft are exposed outside of the syringe bore;
positioning the syringe with the sealable luer in sealed condition
lower than the plunger-bore plate;
hand-squeezing the flexible walls of the plunger shaft sufficiently
to break the ampule within the plunger-shaft bore;
removing a pressure-equalizer cover from the plunger-bore plate;
allowing the sterile preparation to flow from the broken ampule
into the syringe bore by means of a vacuum in the syringe bore and
in the plunger bore in negative-pressure relationship to a fluid
head of the sterile preparation;
reversing position of the syringe to where the sealable luer is
above the plunger-bore plate;
unsealing the sealable luer,
attaching a hypodermic needle to the sealable luer;
aspirating the syringe; and
injecting sterile preparation from the syringe as desired.
Medical syringe description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to medical syringes. More particularly,
it relates to a syringe having a plunger bore that is flexible against
an internal glass ampule containing a drug to break the ampule and
direct the drug into a syringe bore.
2. Description of Related Art
A wide variety of medical syringes have been devised to optimize
time and convenience in relation to storage, use and prevention
of contamination dangers. But none are known or believed to exist
with a means for containing a glass ampule inside the syringe where
it is fractured to allow a sterile preparation to be directed from
the ampule into the syringe for injection.
Shelf-life of preparations in hermetically-sealed ampules is many
times longer than for those stored in plastic or other types of
containers. However, a hermetically-sealed glass container is difficult
to use. There has been no convenient and sanitary method for transferring
its contents into a syringe. Consequently, glass ampules often have
sections which are openable by various means. But any non-glass
section decreases contaminating or porous surface area of the ampule,
rather than eliminating it totally. This invention solves the problem
of injecting sterile preparations contained in hermetically-sealed
glass ampules.
SUMMARY OF THE INVENTION
A medical syringe has a hollow plunger shaft that is flexible.
A hermetically-sealed glass ampule containing a drug in the form
of a liquid referred to generally as a sterile preparation is placed
in the hollow plunger shaft. When the plunger is pulled outwardly
a select distance to expose the flexible hollow plunger shaft, the
glass ampule is broken by hand-squeezing the plunger shaft against
it. Liquid preparation from the glass ampule is directed through
a check-valved orifice at a tip of a resilient piston section of
the plunger. At the check-valved orifice, the preparation enters
into a syringe bore. There the preparation can be injected through
a conventional luer and hypodermic needle by the standard practice
of depressing the plunger into the syringe. Variations are provided
for storing ampules of preparation either in or separately from
the syringe. Embodiments are described for various adaptations.
Use methods are described.
BRIEF DESCRIPTION OF THE DRAWINGS
This invention is described by appended claims in relation to description
of a preferred embodiment with reference to the following drawings
wherein:
FIG. 1 is a cutaway elevation view of a disposable-syringe embodiment
of the invention containing an ampule of sterile preparation in
a plunger bore.
FIG. 2 is a cutaway elevation view of the FIG. 1 illustration after
the ampule is broken and the sterile preparation is in the syringe
bore.
FIG. 3 is an inverted cutaway elevation view of an assembled FIG.
1 embodiment of the syringe in aspiration attitude.
FIG. 4 is a cutaway elevation view of an embodiment of the invention
having a means for isolating the sterile solution from ambient air
in the syringe, that is storable separately from ampules and is
optionally reusable.
FIG. 5 is a cutaway elevation view of the FIG. 4 embodiment after
sterile preparation has been transferred to the bore of the syringe.
FIG. 6 is an inverted cutaway elevation view of an assembled FIG.
4 embodiment in aspiration attitude.
FIG. 7 is a cutaway elevation view of a disposable-syringe embodiment
having a different means for isolating sterile preparation from
ambient air.
FIG. 8 is a side elevation view of a conventional ampule of the
type used in this invention.
FIG. 9 is a sectional cutaway side view of a fragmentation ampule
for breaking into shaped fragments without sharp edges or minute
particles.
FIG. 10 is an exploded sectional cutaway side view of a plunger
piston with an embodiment of a locking means and value means.
FIG. 11 is an elevation view of a mallet constructed as an aid
in breaking glass ampules.
FIG. 12 is a cutaway elevation view of a plunger having metallic
or other hard internal ridges for breaking glass ampules.
DESCRIPTION OF PREFERRED EMBODIMENT
Reference is made to FIG. 1. A syringe plunger 1 has a plunger
bore 2 into which is insertable a glass ampule 3 containing a drug
in the form of a liquid referred to as a sterile preparation 4.
Plunger walls 5 of the plunger bore 2 are flexible inwardly by
hand-squeezing or other method to break the ampule 3 when the plunger
bore 2 is pulled outwardly from syringe bore 6 of syringe barrel
7.
As the syringe plunger 1 is pulled outwardly from the syringe barrel
7 negative pressure is caused in the syringe bore 6 as a result
of changing volume sealed by a combination of plunger piston rings
8 luer shank seal 9 and plunger grip seal 10. The syringe plunger
is pulled outwardly by gripping syringe handle 11 and plunger handle
12. The luer shank seal 9 can be in the form of a blind hypodermic
needle holder as illustrated.
At the plunger handle 12 there is a plunger-bore plate 13 with
a pressure-equalizer orifice 14 that is sealable by plunger grip
seal 10 which can be in the form of an adhesive peal-away sheet
or other convenient covering means. Negative pressure in the plunger
bore 2 and in the syringe bore 6 is equalized by fluid communication
through piston bore 15 and tip port 16 having one-way valve 17 in
check-valve relationship to fluid flow from the plunger bore 2 into
the syringe bore 6. The syringe plunger 1 can be held conveniently
in this negative bore-pressure condition by depressing lever 18
to insert latch 19 into latch notch 20.
The ampule 3 is broken by squeezing plunger walls 5 while the syringe
barrel 7 is held at an attitude that positions the ampule 3 above
the syringe barrel 7 and while the negative bore-pressure is maintained
with the latch 19 in the latch notch 20. A vertical or near vertical
attitude is preferable.
These conditions cause a head of preparation 4 fluid to flow in
the direction of plunger piston 21 and piston bore 15. Then when
plunger grip seal 10 is removed or otherwise dislodged to uncover
pressure-equalizer orifice 14 the sterile preparation flows past
one-way valve 17 in syringe bore 6.
Referring to FIGS. 1 and 2 fluid preparation 4 is filtered through
filter 22 to prevent glass particles 23 from entering the syringe
bore 6 where they could be injected with the preparation 4.
Referring to FIG. 3 the sterile preparation 4 is prevented by
one-way valve 17 from returning into syringe bore 6 when the syringe
barrel 7 is aspirated in inverted attitude the same as for conventional
syringes. Tightness of seal increases with injection pressure. The
latch 19 is removed from latch notch 20 and glass particles 23 fall
to the vicinity of plunger-bore plate 13 where they can be contained
securely if desired by replacing a peal-away plunger-grip seal 10.
The embodiment of the invention shown in FIGS. 1-3 is intended
to be a disposable syringe. For this purpose, it is preferable that
the plunger-bore plate 13 be made of glass or other material which
is breakable into fragments which cannot be reassembled if broken
to be reused with another ampule of preparation 4. The ampule 3
can be stored in the plunger bore 2 with the syringe plunger 1 and
syringe barrel 7 assembled. The ampule 3 of preparation 4 is stored
in a form that it can be injected with a disposable means using
this embodiment of the invention.
Referring to FIGS. 4-6 the ampule 3 of preparation 4 can be stored
separately and inserted into plunger bore 2 when desired by removing
an attachable plunger lid 24 and replacing it after the ampule 3
has been placed in the plunger bore 2. All other features, components
and adaptations can be the same for the different embodiments. Appropriate
sanitation is assumed for both syringe storage or separate storage
and injection of preparation 4 in ampule 3.
Preparation 4 can be isolated from ambient air by a free piston
25 having free-piston rings 26. The free piston 25 is inserted in
the plunger bore 2 after insertion of the ampule 3. The free piston
25 is actuated by negative pressure to travel towards the plunger
piston 21 after the plunger grip seal 10 has been opened. As it
travels in that direction, the free piston 25 wipes preparation
4 from inside surfaces of plunger walls 5 and carries it in the
direction of the syringe bore 6 for a more complete use of the preparation.
Free piston 25 also prevents glass fragments from falling out through
pressure-equalizer orifice 14 during aspiration and use.
Referring further to FIGS. 4-6 a piston-bore filter 27 can be
a cylindrical member insertable in piston bore 15. In addition to
filter 27 or filter 22 there can be small tubular conveyances 28
positioned between plunger bore 2 and tip port 16 as illustrated
in FIGS. 1-7. This further prevents particles of glass 23 from entering
the syringe bore 6. Optionally also, a filter 22 can be relatively
porous and used in conjunction with filter 27 that can be finer
and longer for filtering finer particles. Any appropriate form and
combination of filters can be used with or without the small tubular
conveyances 28.
Referring to FIG. 7 a balloon 29 can be attached to the plunger-bore
plate 13 to contain ambient air entering through pressure-equalizer
orifice 14 and prevent it from contaminating the preparation 4.
However, it may be fractured by glass fragments 23 unless relatively
tough material is used for its construction.
Referring to FIGS. 7-9 a conventional ampule 3 intended for use
with this invention has smooth walls. Optionally, however, fragmentation
walls 30 with thin-walled break channels therebetween may be employed
to cause smooth-edged glass particles 31 as illustrated in FIG.
7. Smooth-edged glass 31 is an optional advantage for all embodiments
of this invention but is not necessary with adequate filters 22
and 27 and with adequate breakage of the ampule 3 by squeezing plunger
walls 5.
Metallic strips 32 shown in FIG. 12 can be provided on the inside
of plunger walls 5 to aid in breaking the glass ampule 3 whether
having conventional smooth walls or fragmented walls 30. However,
metallic strips 32 are a tradeoff option to a free piston because
they would tend to prevent sealing of free-piston rings 26.
Referring to FIG. 11 optionally also for use particularly with
the attachable plunger lid 24 is a mallet 33 which can be variously
shaped. It can be employed directly against glass of the ampule
3 or against the free piston 25.
Referring to FIG. 10 a spring-actuated poppet valve 34 is optional
to a conventional flapper valve, also known as a reed valve, illustrated
in FIGS. 1-7 at the tip port 16 as the one-way valve 17.
The lever 18 to which the latch 19 is attached in FIGS. 1-7 can
be biased outwardly such that it must be depressed and held to keep
the plunger 1 in place in a drawn condition while breaking the ampule
3 and causing the mixture 4 to flow into the syringe bore 7. Optionally,
the lever 18 can be biased inwardly such that it automatically prevents
the plunger 1 from being withdrawn from the syringe bore 7. As an
additional convenience, a beveled latch 35 on an inwardly-biased
lever 18 can automatically prevent inward travel of the plunger
1 also unless a designed amount of pressure is applied on the plunger
1 to push it into the syringe bore 6. A beveled notch 36 can be
employed in combination with or in lieu of beveled latch 35.
This invention employs accepted professional use of a conventional
hypodermic needle 37 and the highly-reliable tapered luer shank
38 on which a hypodermic needle sheath 39 is retained by inside-diameter
threads in a luer sleeve 40.
A new and useful ampule-container medical syringe and use methods
having been described, all such modification, adaptations, applications
and forms thereof described by the following claims are included
in this invention. |