Abstrict Disposable syringe (100) characterized in that it is provided a
needle carrier socket element (4), coupable with a lip of a reservoir
(1) from inside the same reservoir, in that a seal (46) is realized
on said lip for seating a sealing gasket (7) between needle carrier
socket (4) and reservoir lip, in that it is provided a double hook
element (9), causing, after the piston stroke toward the end of
said socket element (4) of the needle (5), to allow its retraction
within the reservoir (1) during the reverse stroke of the piston
(2) and in that an elastic element or spring (8) is provided between
said double hook element (9) and the end of said reservoir lip,
that, when compressed, maintains said double hook element (9) in
its position, and when extended acts to cause the return of the
needle (5) within the reservoir (1).
Claims 1. Disposable syringe with retractile needle, comprising a reservoir,
having a rear end open for the slidable insertion of a piston element,
provided with gasket on the end faced toward the inside of said
reservoir, and a front end, open as well, provided with lip for
the coupling of a needle, and a protection cap for the needle when
it is not used, said syringe being characterised in that it is provided
a needle carrier socket element, coupable with said lip of the reservoir
from inside the same reservoir, in that a seat is realised on said
lip for seating a sealing gasket between needle carrier socket and
reservoir lip, in that it is provided a double hook element, causing,
after the piston stroke toward the end of said socket element of
the needle, to allow its retraction within the reservoir during
the reverse stroke of the piston, and in that an elastic element
or spring is provided between said double hook element and the end
of said reservoir lip, that, when compressed, maintains said double
hook element in its position, and when extended, acts to cause the
return of the needle within the reservoir.
2. Disposable syringe with retractile needle according to claim
1 characterised in that a seat for housing of a sealing gasket
is realised between needle carrier socket element and reservoir
lip.
3. Disposable syringe with retractile needle according to claim
1 characterised in that an irreversibility point is indicated on
said reservoir, indicating the irreversibility of the piston action.
4. Disposable syringe with retractile needle according to claim
1 characterised in that said socket element for the needle provides
a hinge for spherical coupling of the double hook element, a start
for the translation of the socket element from the seat, a seat
for the fixed joint of a lug of the double hook element, a stop
for said double hook element, a seat for said elastic element or
spring.
5. Disposable syringe with retractile needle according to claim
4 characterised in that said means for the coupling of the double
hook element are comprised of a spherical coupling hinge of the
double hook element.
6. Disposable syringe with retractile needle according to claim
4 characterised in that said needle carrier socket provides a seat
for said sealing gasket between socket and syringe body.
7. Disposable syringe with retractile needle according to claim
1 characterised in that said double hook element provides a hollow
central element, provided with large longitudinal cuts on its upper
part, lateral lugs, coupled with said central hollow element, and
symmetrically provided with respect to the same, coupling with a
"knee" seat realised on said socket element, and its end
provided according to a reduced angle hinge, allowing only a `partial
rotation about its axis, and, at the bottom, with lugs, said lugs
being provided with an irreversible hooking with said needle carrier
socket.
8. Disposable syringe with retractile needle according to claim
7 characterised in that said hollow central element has a substantially
cylindrical shape.
9. Disposable syringe with retractile needle according to claim
7 characterised in that said hollow central body is provided above
with large longitudinal cuts.
10. Disposable syringe with retractile needle according to claim
7 characterised in that said seat has a "knee" shape.
11. Disposable syringe with retractile needle according to claim
7 characterised in that said ends are provided according to a reduced
angle hinge configuration.
12. Disposable syringe with retractile needle according to claim
1 characterised in that deformable materials are employed.
13. Disposable syringe with retractile needle according to claim
1 characterised in that a plurality of lateral lugs on the double
hook element is provided.
14. Disposable syringe with retractile needle according to claim
1 characterised in that a plurality of elastic elements or springs,
placed in series, is provided.
15. Disposable syringe with retractile needle according to claim
1 characterised in that said piston has each necessary shape.
16. Disposable syringe with retractile needle according to claim
1 characterised in that said double hook element is coupled with
the needle carrier socket by welding or fixed joint.
17. Disposable syringe with retractile needle according to claim
1 characterised in that said needle carrier socket element remains
blocked, with respect to the downward vertical movements, by a force
coupling with said sealing gasket, and by the suitable seat realised
in said lip syringe, with respect to the upward vertical movements
by said lugs of the double hook element, engaging on the syringe
body in a suitable seat, with respect to the transverse movements,
by the coupling with minimum tolerances between socket element and
syringe body, and with respect to the rotation movements about the
syringe axis by friction.
18. Disposable syringe with retractile needle according to claim
1 characterised in that said elastic element or spring and said
sealing gasket are compressed during the injection phase, contributing
to maintain said double hook element in position, pushing it upward
against the syringe body.
19. Disposable syringe with retractile needle according to claim
1 characterised in that said piston, passing said irreversibility
point, arms the hooking device of the double hook element, causing
the buckling by rotation of the lateral lugs, thus releasing said
"knee" element from the restraint with the syringe body,
and said double hook element, sliding downward, by lugs provided
with fixed joints, hooks on the needle carrier socket element, thus
realising a sole assembly wit the same socket element, needle--needle
carrier socket element--double hook element assembly sliding backward
by the action of the elastic element or spring, dragging, in its
extension stroke said needle within the reservoir, released by the
pushing action on the piston.
Description [0001] The present invention relates to a disposable syringe with
retractile needle.
[0002] More specifically, the invention concerns a syringe of the
above kind provided with a needle retractile in such a way to prevent
a second use of the same.
[0003] As it is well known, there are already available on the
market different kind of syringes on which the needle is applied
from outside on the body of the reservoir of the syringe by the
coupling with a plastic support or socket.
[0004] After the use, said needle is usually disposed along with
the syringe, very often without any protection of the suitable cap.
[0005] It is well evident that disposal of the syringe in this
way involves the risk of transmitting diseases by contacting the
needle, transmission that can occur in case of using the syringe
by more than one user, or puncture during the positioning of the
protection cap on the needle, or of occasional contact with the
needle by those in charge of cleaning the place where the syringe
has been thrown away without using the cap to protect the needle.
[0006] In view of the above, different solutions have been studied
in the past in order to solve the above drawback.
[0007] However, none of the suggested solutions allows to solve
in a definitive way the above mentioned drawbacks, since each on
them introduces a remarkable use complexity, being it necessary
to use them with a different procedure with respect to that one
adopted with the traditional disposable syringes.
[0008] Furthermore, reduced dimensions and the number of single
pieces comprising the syringes make it complicated the industrial
realisation.
[0009] Among the various solutions suggested they can be mentioned
the solutions providing the rotation of the piston in such a way
to release the needle from its seat and pulling it away by the same
piston, or those providing the piston with hooks that at the end
of the stroke can block on the needle, hooking on the same, and
withdrawing the same during the following ascent phase of the piston.
[0010] However, each one of the above mentioned solutions is such
to induce a series of consequences, among which the premature exit
of the needle during an injection, or a recoil or steps that could
jeopardise the functionality of the device.
[0011] In view of the above, the Applicant has realised a disposable
syringe able to solve all the above mentioned drawbacks.
[0012] Main object of the present invention is therefore that of
providing a syringe that is easy to be used and simple to realise.
[0013] Still another object of the present invention is that of
providing a disposable syringe that is irreversible, so that, once
passed the activation limit, determining the complete use of the
syringe contents, and in any case allowing mixing of medicines before
the injection, and the sureness of activating the syringe, the same
syringe can no more be used.
[0014] A further object of the present invention is a disposable
syringe that is stable, i.e. realised in such a way to prevent steps
and recoil during its use.
[0015] Still another object of the present invention is that of
providing a syringe that is cheap and easy to be realised, being
comprised of a very low number of pieces to be assembled.
[0016] It is further object of the present invention that of providing
a syringe of the above kind that is very easy to be used, not being
required by the user any further procedure but to pay attention
not to pass the irreversibility limit, indicated and viewable on
the body of the syringe before its use.
[0017] It is therefore specific object of the present invention
a disposable syringe with retractile needle, comprising a reservoir,
having a rear end open for the slidable insertion of a piston element,
provided with gasket on the end faced toward the inside of said
reservoir, and a front end, open as well, provided with lip for
the coupling of a needle, and a protection cap for the needle when
it is not used, said syringe being characterised in that it is provided
a needle carrier socket element, coupable with said lip of the reservoir
from inside the same reservoir, in that a seat is realised on said
lip for seating a sealing gasket between needle carrier socket and
reservoir lip, in that it is provided a double hook element, causing,
after the piston stroke toward the end of said socket element of
the needle, to allow its retraction within the reservoir during
the reverse stroke of the piston, and in that an elastic element
or spring is provided between said double hook element and the end
of said reservoir lip, that, when compressed, maintains said double
hook element in its position, and when extended, acts to cause the
return of the needle within the reservoir.
[0018] According to the invention, an irreversibility point is
indicated on said reservoir, indicating the irreversibility of the
piston action.
[0019] Always according to the invention, said socket element for
the needle provides a hinge for spherical coupling of the double
hook element, a start for the translation of the socket element
from the seat, a seat for the fixed joint of a lug of the double
hook element, a stop for said double hook element, a seat for said
elastic element or spring, a seat for said sealing gasket between
socket and syringe body, a seat having a conical start for said
needle, and walls having reduced tolerance.
[0020] Always according to the invention, said double hook element
provides a hollow cylinder, provided with large longitudinal cuts
on its upper part, lateral lugs, coupled with said central cylindrical
body, and symmetrically provided with respect to the same, coupling
with a "knee" seat realised on said socket element, and
its end provided according to a reduced angle hinge, allowing only
a partial rotation about its axis, and, at the bottom, with lugs,
said lugs being provided with an irreversible hooking with said
needle carrier socket.
[0021] Preferably, it is provided a plurality of lateral lugs on
the double hook element.
[0022] Still according to the invention, it can be provided a plurality
of elastic elements or springs, placed in series.
[0023] According to the invention, said piston can have each shape.
[0024] Furthermore, according to the invention, said double hook
element can be coupled with the needle carrier socket by welding
or fixed joint.
[0025] Still according to the invention, said needle carrier socket
element remains blocked, with respect to the downward vertical movements,
by a force coupling with said sealing gasket, and by the suitable
seat realised in said lip syringe, with respect to the upward vertical
movements by said lugs of the double hook element, engaging on the
syringe body in a suitable seat, with respect to the transverse
movements, by the coupling with minimum tolerances between socket
element and syringe body, and with respect to the rotation movements
about the syringe axis by friction.
[0026] Always according to the invention, said elastic element
or spring and said sealing gasket are compressed during the injection
phase, contributing to maintain said double hook element in position,
pushing it upward against the syringe body.
[0027] Always according to the invention, said piston, passing
said irreversibility point, arms the hooking device of the double
hook element, causing the buckling by rotation of the lateral lugs,
thus releasing said "knee" element from the restraint
with the syringe body, and said double hook element, sliding downward,
by lugs provided with fixed joints, hooks on the needle carrier
socket element, thus realising a sole assembly wit the same socket
element, needle--needle carrier socket element--double hook element
assembly sliding backward by the action of the elastic element or
spring, dragging, in its extension stroke said needle within the
reservoir, released by the pushing action on the piston.
[0028] Preferably, the elements comprising the syringe according
to the invention are comprised of deformable material.
[0029] The present invention will be now described, for illustrative
but not limitative purposes, according to its preferred embodiments,
with particular reference to the figures of the enclosed drawings,
wherein:
[0030] FIG. 1 is a perspective view, partially in section, of a
disposable syringe according to the invention;
[0031] FIG. 2 is a perspective view, partially in section, of a
particular of the disposable syringe of FIG. 1;
[0032] FIG. 3 is a perspective view, partially in section, even
more in detail, of the particular of FIG. 2;
[0033] FIG. 4 is a detailed perspective tridimensional view, partially
cut away, of the needle carrier socket of the syringe shown in the
preceding figures; and
[0034] FIG. 5 is a detailed perspective tridimensional view, partially
cut away, of the double hook element of the syringe shown in the
preceding figures.
[0035] Coming now to observe all the figures of the enclosed drawings,
a syringe according to the invention, generically indicated by reference
number 100 provides the following components, which are present
also in the standard syringes already available on the market, namely
a cylindrical reservoir 1 a piston 2 a sealing gasket 3 for the
piston 2 a socket 4 for engagement of the steel needle 5 and a
cap 6 for the protection of the needle 5 before and after the use
of the syringe 100.
[0036] Syringe 100 according to the present invention provides
three additional elements, namely a sealing gasket 7 a spring 8
and a double hook element 9 that in the following will also be
indicated as spider element, said elements, and their functionality,
being described in greater detail in the following.
[0037] As it will be clearly noted from the following description,
syringe 100 according to the invention allows to mix the substances
to be injected, making an injection, and sucking blood.
[0038] The structure of the syringe 100 according to the invention
provides its use without releasing the needle retraction device,
and the triggering of the mechanism, making the use of the needle
irreversible.
[0039] Coming now to observe in greater detail the various figures
enclosed, the innovative parts of the syringe 100 according to the
invention will be described.
[0040] Reservoir 1 of the syringe 100 according to the invention
is, as in the standard syringes, but the lip including the needle
5 from inside and not from outside.
[0041] Particularly, as it can be clearly noted from FIG. 2 said
lip of the reservoir 1 has an outer rounded shape, and provides
an anchoring seat 11 for the double hook 9 walls 12 with a reduced
tolerance to receive the needle 5 carrier socket 4 a seat for the
sealing gasket 7 a seat 14 for the spring 8 as well as an indication
15 of the irreversibility point.
[0042] As to the piston 2 it is identical to the one used for
the standard syringes with a flat bottom. The gasket 3 too for the
seal of the piton 2 is identical to the one used for the standard
flat bottom syringes.
[0043] Observing now the needle 5 socket 4 (see also the enclosed
FIG. 4), it is one of the main innovative features of the solution
suggested according to the present invention. First of all, said
socket 4 is mounted inside the reservoir 1 rather than outside,
as in the standard syringes.
[0044] Said socket 4 (see in particular FIG. 2) provides a hinge
41 for the spherical coupling of the double hook element 9 an
start 42 for the translation of the seat of the socket 4 a seat
43 for the fixed joint of the lug of the double hook element 9
a stop of the double hook element 9 a seat for the spring 8 a
seat 46 for the sealing gasket between socket 4 and syringe 100
body 1 a seat 47 with a conical start for coupling the needle
5 and walls having reduced tolerances with respect to the syringe
100 body 1.
[0045] The needle 5 too is substantially identical to the traditional
ones, and is mounted on said socket 4.
[0046] As to the cap 6 it is substantially identical to the traditional
ones, being characterised by a wider conicity, since the lip 4 has
bigger dimensions with respect to a traditional cap. Positioning
of the cap 6 is in any case obtained by a simple pressure on the
lip 4.
[0047] Sealing gasket 7 suggested according to the present invention
is indispensable to prevent, even minimum, leakage of liquid contained
within the syringe 100 during the injection. The presence of this
gasket, comprised of a caoutchouc ring, between the syringe 100
body 1 has a remarkable importance. It is provided between the lip
of the body and the needle 5 carrier socket 4 specifically shaped
to receive said element.
[0048] As to the spring 8 it is provided to allow to the needle
5 to be retracted within the reservoir 1. Said spring 8 is housed
within a seat partially obtained in the lip of the syringe 100 body
1 in the needle 5 carrier socket 4.
[0049] Coming now to describe in greater detail the double hook
element 9 and observing also FIG. 5 it comprises, along with the
needle 5 carrier socket 4 the greatest novelty introduced according
to the invention.
[0050] It is a complex geometry element, providing a hollow cylinder
91 having large longitudinal cuts 92 realised in the upper part,
and lateral lugs 93 94 joined with the cylindrical central body
91 in correspondence of the point indicated by the reference number
95 and provided symmetrically with respect to the cylindrical body
91.
[0051] Said lugs 93 94 if seen in section, can be schematised
as two rods 93 94 fixed within a "knee" 96 and with
the ends 97 in a reduced angle hinge realised on the socket 4 only
partially allowing the rotation about its axis.
[0052] Two further lugs 98 are provided, symmetric with respect
to the cylindrical body 91 and provided with ends 99 for irreversible
hooking with the needle 5 carrier socket 4.
[0053] In the following, the operation of the syringe 100 according
to the present invention will be described, being thus it possible
to put into evidence all the innovative features introduced.
[0054] Needle 5 carrier socket 4 is placed within the syringe 100
and remains blocked with respect to every movement. Particularly,
vertical downward movements of the socket 4 are prevented by the
force coupling between the rubber sealing gasket 7 and the suitable
seat 13 obtained in the lip of the syringe 100 while upward vertical
movements are prevented by the lugs of the double hook element 9
abutting on the syringe 100 body in the suitable seat 11.
[0055] As to the transverse movements of the socket 4 restraint
is comprised of the socket 4--syringe 100 body 1 coupling providing
minimum tolerances, while rotation movements about syringe axis
100 are prevented by the friction of the force torque between syringe
100 body 1 and the knee 96 of the double hook element 9.
[0056] Spring 8 and sealing gasket 7 are compressed and contribute
to maintain in position the double hook element 9 pushing it upward
against the syringe 100 body 1 in correspondence of said seat 11.
[0057] During the injection, piston 2 moves toward the bottom;
once passed the irreversibility point 15 indicated on the reservoir
1 by a viewable mark, piston 2 acts in such a way to arm the hooking
device 99 and at the same time acts on the double hook element
9 pushing it downward.
[0058] Said push make it possible the rotatory deformation of the
lateral lugs 93 94 releasing the knee 96 from the seat 11 realised
in the syringe 100 body 1. Sliding downward, double hook element
9 by the lugs 98 along with the fixed joint elements 99 hooks
with the needle 5 carrier socket 4 in correspondence of the coupling
seat 43 thus realising a single assembly with the same socket 4.
[0059] Said operation is irreversible, so that it will no more
be possible to bring the double hook element 9 in the start conditions.
[0060] Assembly comprised of needle 5 needle 5 carrier socket
4 and double hook element 9 slide backward by the action of the
spring 8 that is allowed to decompressing, dragging the needle
5.
[0061] Spring 8 action acts also on the piston 2 so that the same
goes back, leaving free a space within the reservoir 1 to receive
the needle 5.
[0062] FIG. 3 shows in section the lip of the reservoir 1 putting
into evidence the needle 5 socket 4 the double hook element 9
in armed position, the spring 8 and the compressed sealing gasket
7. Piston 2 thrust makes it possible the deformation by rotation
of the lateral lugs 93 94 releasing the knee 96 from the seat
11 realised in the syringe 100 body 1. Sliding downward, double
hook element 9 by the lugs 98 provided with fixed joint elements
99 hooks the needle 5 carrier socket 4 in correspondence of the
seat 43 thus realising a sole assembly with the same socket 4.
[0063] The present invention has been described for illustrative
but not limitative purposes, according to its preferred embodiments,
but it is to be understood that modifications and/or changes can
be introduced by those skilled in the art without departing from
the relevant scope as defined in the enclosed claims.
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