CA2090496A1 - Safety syringe with automatically retractable hollow needle - Google Patents
Safety syringe with automatically retractable hollow needleInfo
- Publication number
- CA2090496A1 CA2090496A1 CA002090496A CA2090496A CA2090496A1 CA 2090496 A1 CA2090496 A1 CA 2090496A1 CA 002090496 A CA002090496 A CA 002090496A CA 2090496 A CA2090496 A CA 2090496A CA 2090496 A1 CA2090496 A1 CA 2090496A1
- Authority
- CA
- Canada
- Prior art keywords
- syringe
- cylinder
- needle
- opening
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
- A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
- A61M5/346—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub friction fit
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/50—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
- A61M5/5013—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe
- A61M5/502—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe for blocking the piston
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/50—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
- A61M5/508—Means for preventing re-use by disrupting the piston seal, e.g. by puncturing
Abstract
A syringe with a device for automatically clamping the needle and means for retracting the needle into the syringe at the end of an injection has the following members: an outer cylinder (1) and an inner cylinder (7); openings (2, 3) at the ends of the cylinder (1); an opening (11) at one end of the cylinder (7); closure means (12) for the opening (11); a needle with a head (14); sealing means (33, 34) in the closure means (12); spring means (29) for urging the needle (6) against the member (12); a spring (21) loaded device (17) for clamping part of the needle (6) at the distal end of the needle and for releasing the needle (6); a membrane (35) integrally formed with the member (12) that bends before tearing; means (17, 18) for denying access to the inside of the syringe; holding means (45) for preventing the second cylinder (7) from being withdrawn through the proximal end (2) of the syringe.
Description
- SYRINGE FITTED WITH A CLAMPING DEVICE FOR THE NEEDLE AND
. WITH MEANS TO ENABLE THE NEEDL.E TO BE AUTOMATICALLY RE-TRACTABLE INTO THE SYRINGE BODY AT THE END OF AN INJECTION.
5 The present invention relates to a syringe fitted with a clamping device to clamp the needle at a position of injection and with means which enable the needle to be retractable into the the body of the syringe at the end of the injec-tion.
BACKGROUND OF THE INVENTION
10 Syringes fitted with means to retract automatically the needle at the end of the injection are known.
One of these syrin~es is shown in Edward F. Allard, U.S. Patent No.
4,838,869, which is related to a hypodermic needle which retracts into the body of the syringe after use, thereby preventing the reuse and the spread of 15 diseases normally associated therewith. This syringe comprises outer and in-ner cylinders wherein the outer cylinder has a first end with a first opening for effecting the protrusion of said needle and a second end with a second opening allowing for the moving of the inner cylinder through the outer cylin-der. The inner cylinder is located within the confines of the outer cylinder for 20 receiving and storing the needle when retracted.
Plunger means are in slidable contact with the inner wall of the outer cylinder for effecting a vacuum inside the syringe upon actuating the plunger in an outward direction, whereby a fluid may be drawn into the outer cylinder and expelied upon actuating the plunger inwardly.
25 The needle which extends through the second opening of the outer cylinder has a head somewhat larger than the diameter of the needle to establish a rim that can be used to firmly hold the needle in place during use by holding tabs within the first end of the outer cylinder; the needle is spring loaded, wherebyupon contacting the holding tabs with the end of Ihe plunger the spring loaded 30 needle is caused to be disenyaged and retracted into the inner cylinder for : .
.-: 2 storage.
The problems which the syringe device shown in US - A 4 83~ ~69 does not solve are the following:
1- To allow the syringe to be completely emptied out.
5 2- To shear the closing element placed in the opening of the second cylinder housed by the first cylinder.
3- To prevent the needle from being easy reached after use of the syringe.
4- To place sealing means at a suitable position in order to prevent the fluid to be injected from being transferred into a cavity which houses the head of the 1 0 needle.
5- To properly dispose the needle with respect to the outer cylinder.
6- To allow the inner cylinder to be clamped by the outer cylinder in order to . prevent the needle from being easy reached after use of the syringe. .
aim of the invention 15 The present invention, as claimed, is intended to remedy these drawbacks. It solves the problem of creating a syringe fitted with a clamping device for the needle and with means to enable th~ needle to be automatically retractable into the syringe body at the end of an injection. By using a syringe according to the present invention the following results are achieved: the needlle is ZO maintained in a right position before the injection by pliers means which clamp automatically the same needle; said pliers means allowing the needle to be retracted into the body of the syringe and to close any entry of the sy-ringe at the end of the injection.
Furthermore all the fluid is injected into the body of the patient and the entry of 25 the needle into second cylinder of the syringe is made easy by a sharp ele-ment disposed at the basis of the head of the same needle.
The advantages offered by the invention are mainly that the inner cylinder is clamped by the outer cylinder at the end of Ihe injection thus preventing the needle from being easy reached after use of the syringe 30 brief description of the drawings !
. .
One way of carrying out the invention is described in detail below with refer-ence to drawings which iliustrate only one specific embodiment, in which:
Fig.1 is a vertical section view of a syringe according to the present invention;
Fig.2 is a vertical section view of an outer c,ylinder of the syringe;
5 Fig.3 is a partial section view of the syringe;
Fig.4 is an exploded view of a constructive detail of the syringe;
Fig.5 is a cross-section view of the needle, of its head and of a covering com-prising a sharp part;
Fig.6 is an exploded view of the inner cylinder and of the gasket which closes 10 an opening of the same cylinder;
Fig.7 is a front view of the syringe;
Fig.8 shows the syringe before the end of the injection;
Fig.9 is a partial view of the syringe after use;
Fig. 10 shows a needle fitted with a sharp part having four points.
l 5 description of the preferred embodiment The syringe shown in the Figs comprises a first outer hollow cylinder 1 having a longitudinal symmetry axis, a first opening 2 and a second opening 3; this latter is located at an end 4 of a cylindrical hollow piece 5 which extends on the outside of the cyiinder 1; a needle 6 protrudes outward the syringe through the second opening 3.
A second hollow cylinder 7 is housed in the iirst cylinder 1 through the open-ing 2; the second cylinder 7 is coaxial with the first cylinder 1 and has an ex-ternal end 8 made by a closing element 9, which enables to push the cylinder 7 in the direction of injection.
. WITH MEANS TO ENABLE THE NEEDL.E TO BE AUTOMATICALLY RE-TRACTABLE INTO THE SYRINGE BODY AT THE END OF AN INJECTION.
5 The present invention relates to a syringe fitted with a clamping device to clamp the needle at a position of injection and with means which enable the needle to be retractable into the the body of the syringe at the end of the injec-tion.
BACKGROUND OF THE INVENTION
10 Syringes fitted with means to retract automatically the needle at the end of the injection are known.
One of these syrin~es is shown in Edward F. Allard, U.S. Patent No.
4,838,869, which is related to a hypodermic needle which retracts into the body of the syringe after use, thereby preventing the reuse and the spread of 15 diseases normally associated therewith. This syringe comprises outer and in-ner cylinders wherein the outer cylinder has a first end with a first opening for effecting the protrusion of said needle and a second end with a second opening allowing for the moving of the inner cylinder through the outer cylin-der. The inner cylinder is located within the confines of the outer cylinder for 20 receiving and storing the needle when retracted.
Plunger means are in slidable contact with the inner wall of the outer cylinder for effecting a vacuum inside the syringe upon actuating the plunger in an outward direction, whereby a fluid may be drawn into the outer cylinder and expelied upon actuating the plunger inwardly.
25 The needle which extends through the second opening of the outer cylinder has a head somewhat larger than the diameter of the needle to establish a rim that can be used to firmly hold the needle in place during use by holding tabs within the first end of the outer cylinder; the needle is spring loaded, wherebyupon contacting the holding tabs with the end of Ihe plunger the spring loaded 30 needle is caused to be disenyaged and retracted into the inner cylinder for : .
.-: 2 storage.
The problems which the syringe device shown in US - A 4 83~ ~69 does not solve are the following:
1- To allow the syringe to be completely emptied out.
5 2- To shear the closing element placed in the opening of the second cylinder housed by the first cylinder.
3- To prevent the needle from being easy reached after use of the syringe.
4- To place sealing means at a suitable position in order to prevent the fluid to be injected from being transferred into a cavity which houses the head of the 1 0 needle.
5- To properly dispose the needle with respect to the outer cylinder.
6- To allow the inner cylinder to be clamped by the outer cylinder in order to . prevent the needle from being easy reached after use of the syringe. .
aim of the invention 15 The present invention, as claimed, is intended to remedy these drawbacks. It solves the problem of creating a syringe fitted with a clamping device for the needle and with means to enable th~ needle to be automatically retractable into the syringe body at the end of an injection. By using a syringe according to the present invention the following results are achieved: the needlle is ZO maintained in a right position before the injection by pliers means which clamp automatically the same needle; said pliers means allowing the needle to be retracted into the body of the syringe and to close any entry of the sy-ringe at the end of the injection.
Furthermore all the fluid is injected into the body of the patient and the entry of 25 the needle into second cylinder of the syringe is made easy by a sharp ele-ment disposed at the basis of the head of the same needle.
The advantages offered by the invention are mainly that the inner cylinder is clamped by the outer cylinder at the end of Ihe injection thus preventing the needle from being easy reached after use of the syringe 30 brief description of the drawings !
. .
One way of carrying out the invention is described in detail below with refer-ence to drawings which iliustrate only one specific embodiment, in which:
Fig.1 is a vertical section view of a syringe according to the present invention;
Fig.2 is a vertical section view of an outer c,ylinder of the syringe;
5 Fig.3 is a partial section view of the syringe;
Fig.4 is an exploded view of a constructive detail of the syringe;
Fig.5 is a cross-section view of the needle, of its head and of a covering com-prising a sharp part;
Fig.6 is an exploded view of the inner cylinder and of the gasket which closes 10 an opening of the same cylinder;
Fig.7 is a front view of the syringe;
Fig.8 shows the syringe before the end of the injection;
Fig.9 is a partial view of the syringe after use;
Fig. 10 shows a needle fitted with a sharp part having four points.
l 5 description of the preferred embodiment The syringe shown in the Figs comprises a first outer hollow cylinder 1 having a longitudinal symmetry axis, a first opening 2 and a second opening 3; this latter is located at an end 4 of a cylindrical hollow piece 5 which extends on the outside of the cyiinder 1; a needle 6 protrudes outward the syringe through the second opening 3.
A second hollow cylinder 7 is housed in the iirst cylinder 1 through the open-ing 2; the second cylinder 7 is coaxial with the first cylinder 1 and has an ex-ternal end 8 made by a closing element 9, which enables to push the cylinder 7 in the direction of injection.
2 5 A second end 10 of cylinder 7 shows an opening 1 1 facing inside first cylinder i and which may be closed by a sealing and closing element 12, better shown in Fig.2.
The needle 6 is partially housed in a covering 13 shaped like a tube, which shows a head 14 inside the first cylinder 1, the head 14 being fitted with a sharp part 15 shaped like a crown with a sharp edge or with a push-rod with ~; :
, . . ~ . . ~,. . . . . .. . .... . . .
4 2 ~ C~J ~
four sharp parts 15, whose dimensions depend on the dimensions of the sy-ringe.
Preferably the covering 13 is an aluminium covering and presents a milled lateral surface 16 to increase the friction between metal surfaces in contact.
5 Furthermore the covering 13 houses a part of the needle 6 with precision.
In a not shown embodiment of the invention the covering 13 is a plastic cover-ing or a synthetic resin covering, the friction coefficient of which is high.
Advantageously the opening 3 presents a seat 23 which widens from the in-side to the outside of the syringe in order to cooperate with a spring 21 to 1 0 clamp parts 18 of a pliers element 17 on the milled surface 16, the spring 21 being able to stress the pliers element 17 toward the inside of the syringe.
The pliers elernent 17 comprises three elastic parts 18, consequently it is able- to clamp the covering 1 when the parts 18 adhere to the seat 23 and to re-.~ Iease it when the parts 18 are moved away from the seat 23.
l 5 The pliers element 17 is made by a cylindrical body 19 substantially housed by the inside of the hollow piece 5; three parts 18 of the pliers element 17 areintegral with the body 19.
.
The outside of the body 19 presents a circular crown on which leans a first end of a spring 21, a second end of which leans on an annular surface 23 provided in the part of the hollow piece 5 near the opening 3. The shape of three parts 18 enables the true clamping of the covering 13 with respect to the symmetry axis of the cylinder 1.
A gasket 24 is located between the outer surface of the body 19 and the inner surface of the piece 5, said gasket being fitted with radial cuts for the passing of the fluid from the cylinder 1 through radial cuts provided in the head 14.
- More precisely the gasket 24 is located in an opening 26 between the cylinder 1 and the piece 5 to prevent the fluid from passing from the cylinder 1 into thehollow piece 5 The embodiment shown in Fig.3 shows the sharp part 15 which protrudes ` 30 easy into cylinder 1, the covering 13 which passes through a cavity 28 with , which it is coaxial, said covering 13 protruding in the outside of the syringe by passing through the pliers element 17 which clamps it. Further a spring 29 is located between an annular surface 30 of the head 14 and an annular surface 31 of the cavity 28 near the opening 2, said spring 29 being able to p~sh to-5 ward the inside of the cylinder 1 the covering 13 and the needle 6 housed inthe same covering 13.
The second cylinder 7 shows a longitudinal cavity 32 able to house the nee-dle 6; this cavity 32 is ciosed by the element 12 which is sliding inside the cylinder 1 to enable the motions of the cylinder 7 in the directions of suction 10 and of injection of the fluid. For this reason the element 12 is fitted with two sealing rings 33 and 34 which prevent the fluid from passing into the part of . the cylinder 1 between the element 12 and the opening 2.
The element 12 is fitted with a diaphragm 35 which closes the opening 11, the diaphragm 35 being able to bend when stressed by the sharp part -15 before 15 its breaking by means of the same sharp part 15. In this way the syrin~e is completely emptied out. :
.- For this reason the diaphragm 35 is disposed at the end of a cylindrical piece 36 which protrudes from the element 12 toward the opening 3. The basis of the piece 3~ is connected with a surface 37 of the element 12 shaped like a 20 truncated cone and having an inclination which is identical with the inclination of a bottom wall 39 of the outer cylinder 1 and which is the limit stop of the mo-tion of the cylinder 7 in the direction of injection. These inclinations and theshape of the diaphragm 35 allow the syringe to be completely emptied out at the end of tha stroke of the cylinder 7 in the direction of injection.
25 The second cylinder 7, the diameter of which is smaller than the diameter of the first cylinder 1, is integral with four ribs 40 which extend longitudinally in the direction of the symmetry axis of the cylinder 7 between a stopping cap 41 for the element 12 and the closing eiement 9 of the external end of the cylin-der 7.
30 To maintain the element 12 in the position which enables the translation ~. . .. . .
,... : . ~ -, .
.
movements within the cylinder 1 and prevents the fluid from passing into the part of the cylinder 1 between the opening 2 and the element 12, a ring 42 is located between the cap 41 and the opening 11, the ring 42 being housed by an annular groove 43 made in the internal part of the element 12.
5 To stop the trans!ation movements of the second cylinder 7 within the first cylinder 1 are provided stopping means 44 made by an annular groove 45 in the lateral inner wall of the first cylinder 1 and by teeth 46 rnade in the ribs 40.
The groove 45 is tapered in the direction which joins the opening 2 with the opening 3; in this way the teeth 46 enable the cylinder 7 to be translated to-l 0 ward the opening 3, by limiting the translation toward the opening 2 for the.~ filling up of the syringe.
-- . RUNNING OFTHE INVENTION
The running of the syringe according to the present invention will be ex-plained below.
l 5 Before the injection the syringe is in the position shown in Fig.2; to enable the fluid to be sucked into the syringe the cylinder 7 is moved toward the head 14 of the needle 6 without any effort. The translation of the cylinder 7 toward theopening 2 allows the entry of the fluid into the part of the cylinder 1 between the gasket 24 and the element 12.
2 0 During the injection the cylinder 7 is movecl toward the opening 3 to inject the fluid into a part of the body of the patient.
When the external surface of the diaphraym 35 touches the sharp part 15 the cylindrical piece 36 starts bending to allow the surface 37 to be brought into contact with the bottom wall 39 of the cylinder 7 in order to allow the syringe to 25 be completely emptied out.
At the end of the translation of the cylinder 7 toward the opening 3 the element12 moves the gasket 24 stressed by the spring 21 toward the opening 3, since the gasket is integral with the body of the pliers element 17, this latter movesoutward the syringe and three parts 18 of the pliers element 17 move away 30 from the seat 23 and open; in this way the covering 13 and the needle 6 are - ; . . . , . . . ~ .. ,~
. ~ ~ . : . . ..
free. The spring 29 pushes the covering 13 and the needle 6 against the di-aphragm 35; in that way the sharp element 15 may break the diaphragm 35 and open the opening 11.
At the end of this operation the needle 6 is inside the cylinder 7 and the parts18 of the piiers 17, which are closed again under the action of the spring 21, prevent a hand from being inserted in the syringe through the opening 3.
The motions of the cylinder 7 toward the opening 2 are limited by the teeth 39 housed in the groove 38; thus the syringe may be not opened at the end of the injection.
, .. ,.. ... -.. :. , . ; . ;, .,. ~ .. , .~, .. .
The needle 6 is partially housed in a covering 13 shaped like a tube, which shows a head 14 inside the first cylinder 1, the head 14 being fitted with a sharp part 15 shaped like a crown with a sharp edge or with a push-rod with ~; :
, . . ~ . . ~,. . . . . .. . .... . . .
4 2 ~ C~J ~
four sharp parts 15, whose dimensions depend on the dimensions of the sy-ringe.
Preferably the covering 13 is an aluminium covering and presents a milled lateral surface 16 to increase the friction between metal surfaces in contact.
5 Furthermore the covering 13 houses a part of the needle 6 with precision.
In a not shown embodiment of the invention the covering 13 is a plastic cover-ing or a synthetic resin covering, the friction coefficient of which is high.
Advantageously the opening 3 presents a seat 23 which widens from the in-side to the outside of the syringe in order to cooperate with a spring 21 to 1 0 clamp parts 18 of a pliers element 17 on the milled surface 16, the spring 21 being able to stress the pliers element 17 toward the inside of the syringe.
The pliers elernent 17 comprises three elastic parts 18, consequently it is able- to clamp the covering 1 when the parts 18 adhere to the seat 23 and to re-.~ Iease it when the parts 18 are moved away from the seat 23.
l 5 The pliers element 17 is made by a cylindrical body 19 substantially housed by the inside of the hollow piece 5; three parts 18 of the pliers element 17 areintegral with the body 19.
.
The outside of the body 19 presents a circular crown on which leans a first end of a spring 21, a second end of which leans on an annular surface 23 provided in the part of the hollow piece 5 near the opening 3. The shape of three parts 18 enables the true clamping of the covering 13 with respect to the symmetry axis of the cylinder 1.
A gasket 24 is located between the outer surface of the body 19 and the inner surface of the piece 5, said gasket being fitted with radial cuts for the passing of the fluid from the cylinder 1 through radial cuts provided in the head 14.
- More precisely the gasket 24 is located in an opening 26 between the cylinder 1 and the piece 5 to prevent the fluid from passing from the cylinder 1 into thehollow piece 5 The embodiment shown in Fig.3 shows the sharp part 15 which protrudes ` 30 easy into cylinder 1, the covering 13 which passes through a cavity 28 with , which it is coaxial, said covering 13 protruding in the outside of the syringe by passing through the pliers element 17 which clamps it. Further a spring 29 is located between an annular surface 30 of the head 14 and an annular surface 31 of the cavity 28 near the opening 2, said spring 29 being able to p~sh to-5 ward the inside of the cylinder 1 the covering 13 and the needle 6 housed inthe same covering 13.
The second cylinder 7 shows a longitudinal cavity 32 able to house the nee-dle 6; this cavity 32 is ciosed by the element 12 which is sliding inside the cylinder 1 to enable the motions of the cylinder 7 in the directions of suction 10 and of injection of the fluid. For this reason the element 12 is fitted with two sealing rings 33 and 34 which prevent the fluid from passing into the part of . the cylinder 1 between the element 12 and the opening 2.
The element 12 is fitted with a diaphragm 35 which closes the opening 11, the diaphragm 35 being able to bend when stressed by the sharp part -15 before 15 its breaking by means of the same sharp part 15. In this way the syrin~e is completely emptied out. :
.- For this reason the diaphragm 35 is disposed at the end of a cylindrical piece 36 which protrudes from the element 12 toward the opening 3. The basis of the piece 3~ is connected with a surface 37 of the element 12 shaped like a 20 truncated cone and having an inclination which is identical with the inclination of a bottom wall 39 of the outer cylinder 1 and which is the limit stop of the mo-tion of the cylinder 7 in the direction of injection. These inclinations and theshape of the diaphragm 35 allow the syringe to be completely emptied out at the end of tha stroke of the cylinder 7 in the direction of injection.
25 The second cylinder 7, the diameter of which is smaller than the diameter of the first cylinder 1, is integral with four ribs 40 which extend longitudinally in the direction of the symmetry axis of the cylinder 7 between a stopping cap 41 for the element 12 and the closing eiement 9 of the external end of the cylin-der 7.
30 To maintain the element 12 in the position which enables the translation ~. . .. . .
,... : . ~ -, .
.
movements within the cylinder 1 and prevents the fluid from passing into the part of the cylinder 1 between the opening 2 and the element 12, a ring 42 is located between the cap 41 and the opening 11, the ring 42 being housed by an annular groove 43 made in the internal part of the element 12.
5 To stop the trans!ation movements of the second cylinder 7 within the first cylinder 1 are provided stopping means 44 made by an annular groove 45 in the lateral inner wall of the first cylinder 1 and by teeth 46 rnade in the ribs 40.
The groove 45 is tapered in the direction which joins the opening 2 with the opening 3; in this way the teeth 46 enable the cylinder 7 to be translated to-l 0 ward the opening 3, by limiting the translation toward the opening 2 for the.~ filling up of the syringe.
-- . RUNNING OFTHE INVENTION
The running of the syringe according to the present invention will be ex-plained below.
l 5 Before the injection the syringe is in the position shown in Fig.2; to enable the fluid to be sucked into the syringe the cylinder 7 is moved toward the head 14 of the needle 6 without any effort. The translation of the cylinder 7 toward theopening 2 allows the entry of the fluid into the part of the cylinder 1 between the gasket 24 and the element 12.
2 0 During the injection the cylinder 7 is movecl toward the opening 3 to inject the fluid into a part of the body of the patient.
When the external surface of the diaphraym 35 touches the sharp part 15 the cylindrical piece 36 starts bending to allow the surface 37 to be brought into contact with the bottom wall 39 of the cylinder 7 in order to allow the syringe to 25 be completely emptied out.
At the end of the translation of the cylinder 7 toward the opening 3 the element12 moves the gasket 24 stressed by the spring 21 toward the opening 3, since the gasket is integral with the body of the pliers element 17, this latter movesoutward the syringe and three parts 18 of the pliers element 17 move away 30 from the seat 23 and open; in this way the covering 13 and the needle 6 are - ; . . . , . . . ~ .. ,~
. ~ ~ . : . . ..
free. The spring 29 pushes the covering 13 and the needle 6 against the di-aphragm 35; in that way the sharp element 15 may break the diaphragm 35 and open the opening 11.
At the end of this operation the needle 6 is inside the cylinder 7 and the parts18 of the piiers 17, which are closed again under the action of the spring 21, prevent a hand from being inserted in the syringe through the opening 3.
The motions of the cylinder 7 toward the opening 2 are limited by the teeth 39 housed in the groove 38; thus the syringe may be not opened at the end of the injection.
, .. ,.. ... -.. :. , . ; . ;, .,. ~ .. , .~, .. .
Claims (10)
1. A syringe fitted with a clamping device for a needle and with means to en-able said needle to be automatically retractable into the syringe body at the end of an injection comprising: a first outer cylinder and a second inner hollow cylinder: a first and a second opening at a first and a second end of said first cylinder; a third opening at a first end of said second cylinder; closing means to close said third opening; a needle extending outward said syringe and able to be housed in said second cylinder, said needle being provided with a head;
sealing means in said closing means to prevent a fluid from being transferred into a part of said first cylinder between said closing means and said first opening; a spring device able to push said needle against said closing means;
wherein said syringe also includes:
a clamping device stressed by spring means, said clamping device being able to support said needle outward said syringe when said spring means are compressed and to release said needle when said spring means are extend-ed;
diaphragm means jointed to said closing means to close said third opening, said diaphragm means being able to bend when pushed by said head to al-low said second cylinder to be brought into contact with a bottom wall of said first cylinder in order to allow said syringe to be completely emptied out;
a sharp element jointed to said head to break said diaphragm means when said second cylinder has reached the full working stroke position in the direc-tion of injection;
closing means to prevent said needle from being reached after use of said sy-ringe;
stopping means to prevent said second cylinder from being moved outward said syringe after use of said syringe.
sealing means in said closing means to prevent a fluid from being transferred into a part of said first cylinder between said closing means and said first opening; a spring device able to push said needle against said closing means;
wherein said syringe also includes:
a clamping device stressed by spring means, said clamping device being able to support said needle outward said syringe when said spring means are compressed and to release said needle when said spring means are extend-ed;
diaphragm means jointed to said closing means to close said third opening, said diaphragm means being able to bend when pushed by said head to al-low said second cylinder to be brought into contact with a bottom wall of said first cylinder in order to allow said syringe to be completely emptied out;
a sharp element jointed to said head to break said diaphragm means when said second cylinder has reached the full working stroke position in the direc-tion of injection;
closing means to prevent said needle from being reached after use of said sy-ringe;
stopping means to prevent said second cylinder from being moved outward said syringe after use of said syringe.
2. The syringe of claim 1, wherein said clamping device is a pliers element comprising three elastic parts able to clamp true said needle with respect to the symmetry axis of said syringe.
3. The syringe of claim 2, wherein said spring means are able to stress said pliers element toward the inside of said syringe; said second opening having a seat which widens from the inside to the outside of said syringe in order to cooperate with said spring means to clamp said elastic parts on a lateral sur-face of said needle; said second cylinder being able to push said spring means toward the outside of said syringe to move away said elastic parts from said seat in order to release said needle.
4. The syringe of claim 1, wherein said needle is partially housed in a cover-ing shaped like a tube which shows a head inside said first cylinder; said cov-ering housing a part of said needle with precision; said covering having a milled lateral surface to increase the friction between said elastic parts in closing position and said milled surface.
5. The syringe of claim 1, wherein said clamping device presents a cavity; a first part of said cavity facing the outside of said syringe being closed by said covering; a second part of said cavity facing the inside of said syringe being closed by said head.
6. The syringe of claim 5, wherein said spring device is housed in said cavity, said spring device being located between an annular surface of said head and an annular surface made in a part of said cavity near said first opening;
said spring device being able to push toward the inside of said first cylinder said covering and said needle housed in the same covering.
said spring device being able to push toward the inside of said first cylinder said covering and said needle housed in the same covering.
7. The syringe-of claim 5, wherein said head is fitted with a sharp part for the breaking of said diaphragm means
8. The syringe of claim 7, wherein said diaphragm means are disposed at the end of a cylindrical piece which protrudes from said closing element toward said second opening.
9. The syringe of claim 8, wherein a surface shaped like a truncated cone is disposed in said closing element, said surface having an inclination which is identical with the inclination of a bottom wall of said first cylinder; said bottom wall being the limit stop of the motion of said second cylinder in the direction of injection; said inclinations and said shape of said closing element allowing the syringe to be completely emptied out at the end of the stroke of said sec-ond cylinder in the direction of injection.
10. The syringe of claim 1, wherein said stopping means are made by an an-nular groove in the lateral inner wall of said first cylinder and by teeth provided in ribs integral with said second cylinder; said annular groove being tapered in the direction which joins said first opening with said second opening in or-der to enable said teeth to make said cylinder translate toward said second opening, by limiting this translation toward said first opening for the filling up of the syringe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP91830226A EP0515766B1 (en) | 1991-05-29 | 1991-05-29 | Security syringe with retractable hollow needle |
| EP91830226.6 | 1991-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2090496A1 true CA2090496A1 (en) | 1992-11-30 |
Family
ID=8208951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002090496A Abandoned CA2090496A1 (en) | 1991-05-29 | 1992-05-29 | Safety syringe with automatically retractable hollow needle |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5201710A (en) |
| EP (1) | EP0515766B1 (en) |
| AT (1) | ATE110287T1 (en) |
| AU (1) | AU655994B2 (en) |
| CA (1) | CA2090496A1 (en) |
| DE (1) | DE59102645D1 (en) |
| ES (1) | ES2067910T3 (en) |
| WO (1) | WO1992021396A1 (en) |
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| CA2584106C (en) | 2004-10-14 | 2011-09-06 | Safety Medical International, Incorporated | Safety medical syringe with retractable needle |
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| US7846135B2 (en) | 2006-02-24 | 2010-12-07 | Midland Medical Holding LLC | Retractable needle syringe with needle trap |
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| US8167820B2 (en) * | 2009-03-20 | 2012-05-01 | Mahurkar Sakharam D | Retractable needle-safety blood sampling device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4687467A (en) * | 1986-06-11 | 1987-08-18 | C.T.F. Research Company | One-time use medical syringe invention |
| US4826491A (en) * | 1987-07-27 | 1989-05-02 | Schramm James J | Needle bearing medical device with three-position shield |
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| ES2009709A6 (en) * | 1989-01-24 | 1989-10-01 | Villar Pascual Jose Antonio | Single-use safety syringe |
| US4994034A (en) * | 1989-07-11 | 1991-02-19 | Botich Michael J | Retractable needle hypodermic syringe system |
| US5019044A (en) * | 1989-08-14 | 1991-05-28 | Tsao Chien Hua | Safety hypodermic syringe |
| US5084018A (en) * | 1989-08-14 | 1992-01-28 | Tsao Chien Hua | Safety syringe |
| FR2652006B1 (en) * | 1989-09-15 | 1992-08-14 | Denis Roger | DEVICE FOR MANUFACTURING ANTICONTAGION SYRINGES. |
| US5104378A (en) * | 1989-10-13 | 1992-04-14 | Habley Medical Technology Corporation | Syringe having means for retracting, canting and destroying a needle cannula |
| US5000736A (en) * | 1990-03-22 | 1991-03-19 | Harry Kaufhold, Jr. | Disposable syringe with automatic needle retraction |
| US5053010A (en) * | 1990-10-03 | 1991-10-01 | Triad Technology | Safety syringe with retractable needle |
| US5092853A (en) * | 1991-02-04 | 1992-03-03 | Couvertier Ii Douglas | Automatic retractable medical needle and method |
-
1991
- 1991-05-29 EP EP91830226A patent/EP0515766B1/en not_active Expired - Lifetime
- 1991-05-29 ES ES91830226T patent/ES2067910T3/en not_active Expired - Lifetime
- 1991-05-29 DE DE59102645T patent/DE59102645D1/en not_active Expired - Fee Related
- 1991-05-29 AT AT91830226T patent/ATE110287T1/en active
-
1992
- 1992-03-04 US US07/845,965 patent/US5201710A/en not_active Expired - Fee Related
- 1992-05-29 CA CA002090496A patent/CA2090496A1/en not_active Abandoned
- 1992-05-29 AU AU18781/92A patent/AU655994B2/en not_active Ceased
- 1992-05-29 WO PCT/EP1992/001197 patent/WO1992021396A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| AU655994B2 (en) | 1995-01-19 |
| WO1992021396A1 (en) | 1992-12-10 |
| ATE110287T1 (en) | 1994-09-15 |
| AU1878192A (en) | 1993-01-08 |
| DE59102645D1 (en) | 1994-09-29 |
| ES2067910T3 (en) | 1995-04-01 |
| EP0515766A1 (en) | 1992-12-02 |
| US5201710A (en) | 1993-04-13 |
| EP0515766B1 (en) | 1994-08-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |