Abstrict The disposable syringe with a plunger rupture device and a washer-guide
sealing barrel nozzle is supposedly safe, since the plunger breaks
up and the piston is stuck an the bottom of the barrel, making impossible
its reloading and avoiding the use of the product. The sequence
for assembling the syringe is shown on page 12/13: fitting the pressure
washer to the plunger--FIG. 12.1; fitting the rubber to the piston
base--FIG. 12.2; fitting the plunger to the piston--FIG. 12.3; inserting
the support bolt to the fitting of the set plunger/piston--FIG.
12.4; fitting the assembled set plunger/piston into the barrel--FIG.
12.5 and finally, the screening washer is sealed, sealing the syringe
entirely--FIG. 12.6. The device is totally manufactured with materials
similar to the ones used in common syringes and available in the
market. Syringes with this device can be assembled in syringes with
volume of 0.5 cc, i.e., in all kinds of available syringes, with
small changes due to their sizes, as shown on page 13/13.
Claims 1. DISPOSABLE SYRINGE WITH RUPTURE OF PLUNGER. Manufactured in
resistant plastic material and sterilized according to the syringes
commonly available in the market: The disposable syringe has a plunger
end different from the ones available now. This plunger end is characterized
by claws and is designed to increase the flexibility of the inferior
end (page 9/13--FIG. 9.1). Those claws are fit into the rubber base,
which has have a groove, as seen in the drawings (page 3/13--FIG.
3); the plunger will remain fastened to the piston through a support
bolt, which is of capital importance for the success of the product
(page 6/13--FIG. 6). The support bolt will have the same diameter
as the hole, where it will be fit in +0 -0 (page 3/13--FIG. 3) in
order to hold it; this way, the claws and the hole of the rubber
base will completely involve the cylindrical or spherical tip of
the bolt (page 6/13--FIG. 6). The user of the syringe will be able
to pull the plunger normally to charge any liquid, since the support
bolt will avoid the return of the claws. The plunger will offer
resistance to the rupture and the set won't break up (page 10/13
FIG. 10.1). However, when the user reverts the action, i.e., when
he presses the plunger to inject the fluid, the proportional pressure
of the liquid against the piston will deform the rubber, displacing
the support bolt automatically, disrupting the function of the support
bolt (FIG. 10.2). In this stage, the plunger is disconnected from
the piston (FIG. 10.3) and it will be impossible to charge new fluids
(FIG. 10.4). After its use, the plunger becomes a container for
the used needle (FIG. 10.5).
2. DISPOSABLE SYRINGE WITH RUPTURE OF PLUNGER. As stated in claim
#1 characterized by the flexibility of the plunger and for the
lower extremity with endings in claws, cut in >45.degree., as
shown in page 9/13 (FIG. 9.1). The claws are fixed with the aid
of the support bolt (FIG. 9.2). The bolt loses its function as support
bolt when it is displaced;
3. DISPOSABLE SYRINGE WITH RUPTURE OF PLUNGER. As stated in claim
#1 characterized by the rupture of the plunger. Once the plunger
is discarded, it becomes an appropriate container for the supposedly
infected needle, due to its hollowness. This way, it will be possible
to avoid accidents with third parts in the handling of the discarded
syringe (page 5/13--FIG. 5 and cut--FIG. 5.1) (page 10/13--FIG.
10.5)
4. DISPOSABLE SYRINGE WITH RUPTURE OF PLUNGER. As stated in claim
#1. Characterized by the existence of a ridge at top extremity (nozzle)
of the barrel, which will wrap the washer-guide. This washer-guide
sealing contains grooves in order to avoid its extraction. The washer-guide
will have an internal diameter larger than the barrel diameter,
enough to fit under pressure and seal the syringe. If the user forces
the extraction of the washer, the washer will break up, making impossible
the normal use of the syringe (page 11/13--FIG. 11 11.1 11.2 and
11.3; perspective view page 7/13--FIGS. 7 7.1 7.2 and 7.4).
5. DISPOSABLE SYRINGE WITH RUPTURE OF PLUNGER. As stated in claim
#1 the device could be manufactured in all models of syringes available
in the market, including syringes of 01 ml and 0.5 ml (insulin)
(page 13/13).
6. DISPOSABLE SYRINGE WITH RUPTURE OF PLUNGER. As stated in claim
#1. Considering that an user can break the washer and keep using
the syringe, the plunger was designed with a minimum dimension traverse,
which creates an oscillation in the handling of the plunger-piston
set. This oscillation removes the perpendicularity of the piston
to the barrel (page 11/13).
7. DISPOSABLE SYRINGE WITH RUPTURE OF PLUNGER. As stated in claim
#1. Although the system is identical, the tuberculin syringe of
01 cc and 0.5 cc will present a small change in the support bolt
and in the claws at the end of the plunger (as shown in the page
13/13--scale 1:1 assembled syringe (FIG. 13); side view (FIG. 13.1);
frontal view (FIG. 13.2); broken system (FIG. 13.3)). The support
bolt will be manufactured in steel and plastic. The needle shall
be manufactured in steel, with its cylindrical or flat tip made
of plastic material, similar to pins available in the market (FIG.
13.4); perspective view--(FIG. 13.5). The bolt may also be manufactured
in steel or any other metal (according to the standard medical-hospital
norms).
Description [0001] Disposable syringes: syringes that were supposed to be discarded
after their use. Unfortunately, those syringes are being re-used,
as proven by the statistics. About 25% of AIDS cases are directly
associated to disposable syringes.
[0002] There are several brands and models of syringes available
in the market. However, no model is really disposable. They are
only projected with the objective of guaranteeing the quality and
sterility of the product. Therefore, it is of extreme importance
that providences are taken so that these syringes can really be
disposed, avoiding the burden of additional expenses to the Health
System due to their re-use. The warnings "To be used only once"
or "To be destroyed after the use!" printed in the packing
don't guarantee that the product will be discarded. There are no
secure ways of supervising the final user of the product. If each
sold unit were really destroyed after its use, the cost with syringes
would be ridiculous when compared with the economy generated by
the reduction of Health expenses due to the sharing of disposable
syringes.
[0003] This Patent of Invention is about the "Disposable Syringe
with a plunger rupture device" or, more accurately, about a
device of automatic action which makes the syringe be used only
once. The syringe is characterized by a device that allows the charging
of fluids as in any common syringe; however, when the piston has
its course reversed, the pressure that the user exercises in the
plunger, and, consequently, in the piston, receives a contrary pressure
from the fluid. At this point, the device is triggered: the rubber
suffers a deformation, expelling the support bolt from the set plunger/piston.
This make the claws at the plunger lose their grip and the piston
detaches itself from the plunger, getting stuck at the bottom of
the barrel, making impossible a second use of the syringe.
[0004] The objective of this invention is to force the use of the
syringe a single time. The breaking of the device is the warranty
against a possible re-use. In order to make easier the understanding
of our invention, we are enclosing a detailed description of the
device. We have used a 20 ml disposable syringe as model.
[0005] Page 1/13--Components. Scale 1:2. Barrel (FIG. 1); Needle
(FIG. 1.1); Plunger (FIG. 1.2) Screening washer-guide (FIG. 1.3);
Support bolt (FIG. 1.4); Piston rubber base (FIG. 1.5); Rubber (FIG.
1.6).
[0006] Page 2/13--Perspective of the system after triggered. (FIG.
2);
[0007] Page 3/13--Upper view of the piston rubber base (FIG. 3).
Scale 1:4;
[0008] Cut of the set rubber and base (FIG. 3.1) Piston in its
normal shape (FIG. 3.2) Scale 1:4 Support bolt (FIG. 1.4) scale
1:4.
[0009] Page 4/13--Upper view of the assembled device;
[0010] Page 5/13--Upper view of the plunger (FIG. 5) scale 1:3;
[0011] A cut of the plunger (FIG. 5.1). scale 1:3;
[0012] Page 6/13--Side view of the plunger claw (FIG. 6). scale
1:3;
[0013] A better description of the action of the claw FIG. 6.1)
scale 1:3;
[0014] Rubber action of the piston (FIG. 6.2 and FIG. 6.3) scale
1:3;
[0015] Page 7/13--Side view of the sealing washer-guide (FIG. 7).
scale 1:2.
[0016] Upper view of the washer sealing guide (FIG. 7.1) scale
1:2.
[0017] Washer-guide in perspective (FIG. 7.2) scale 1:2. Upper
view of the nozzle of the barrel (FIG. 7.3) scale 1:2.
[0018] A cut of the barrel nozzle (FIG. 7.4) scale 1:2.
[0019] Page 8/13--Upper view of the barrel nozzle (FIG. 8). scale
1:4;
[0020] Cut of the barrel (FIG. 8.1) scale 1:4;
[0021] Page 9/13--Syringe in its normal shape (FIG. 9) scale 1:2;
action of the claw after expelling the support bolt and retention
of the plunger claws (FIG. 9.1). scale 1:4 action of the piston
rubber (FIG. 9.3) scale 1:4.
[0022] Page 10/13 (no scales). The assembled syringe as the final
consumer will purchase in the market (ready for use) (FIG. 10).
The process will be identical to the one of common syringes up to
the point of charging of fluids (FIG. 10.1). When the pressure is
reverted, i.e., when the user presses the plunger to expel the fluid,
the energy will be transferred proportionally to the piston, resulting
in the deformation of the rubber. This deformity will automatically
expel the "support bolt" from the plunger/piston set (FIG.
10.2). Once the support bolt is expelled, the plunger loses its
grip and it is disconnected from the piston, disabling the syringe
(FIG. 10.3). The plunger can then be removed from the barrel totally.
However, the piston will be kept at the bottom of the barrel due
to the release of the rubber (FIG. 10.4). The plunger itself will
become a container for the used needle (FIG. 10.5).
[0023] Page 11/13--(No scales)--Demonstration of the impossiBili
ty of a second use without the sealing washer-guide. Once without
the washer-guide, the plunger loses its centralization; consequently,
the piston loses its perpendicularity in relation to the wall of
the barrel. In the charging process, the vacuum will suck the air
(FIG. 11.1) and, in the injection, the pressure of the fluid being
larger than the atmospheric pressure makes the fluid flow back (FIG.
11.2), resulting in the loss of the fluid to be injected (FIG. 11.3).
[0024] Page 12/13--Sequence for assembling the syringe.
[0025] Page 13/13--Device for insulin syringes.
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