GB2237511A - Non-reusable syringe - Google Patents
Non-reusable syringe Download PDFInfo
- Publication number
- GB2237511A GB2237511A GB9022324A GB9022324A GB2237511A GB 2237511 A GB2237511 A GB 2237511A GB 9022324 A GB9022324 A GB 9022324A GB 9022324 A GB9022324 A GB 9022324A GB 2237511 A GB2237511 A GB 2237511A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plunger
- syringe
- hollow member
- partition
- cylinder
- 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.)
- Withdrawn
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
- A61M5/50—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
Landscapes
- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
A disposable syringe comprises a plunger (10) which includes a flange (15) and also a partition member (4) which includes a frangible portion (11). When the plunger is operated during an injection the frangible portion (11) is perforated and the perforation thus formed is covered and sealed by the flange and the injection may therefore proceed. However, the flange must be removed from the perforated partition if an attempt is made to re-use the syringe by withdrawing plunger (10) and, since the perforation is then unsealed, nothing may be sucked into the syringe in normal use. The syringe is therefore unserviceable after only one use. <IMAGE>
Description
A DISPOSABLE SYRINGE
This invention relates to a disposable syringe which may be used only once.
In many situations it is desirable to prevent the transmission of disease and infection which may result from the re-use of syringes, possibly by several people.
According to the present invention from one aspect, there is provided a disposable syringe comprising:
an elongate hollow member which is provided with an orifice into which a needle may be fitted;
a partition which is slidably mounted within the hollow member, forms a seal between chambers within the hollow member on opposite sides of the partition and comprises a first, frangible portion and a second portion;;
a plunger which is received in the hollow member and which comprises an end portion which is engageable with the second portion for urging the partition to slide within the hollow member in a direction away from the orifice and is engageable with the first portion for urging the plunger both to slide within the hollow member in a direction towards the orifice and also to break the first portion and create a passageway between said chambers, which passageway is open if said plunger is removed from engagement with said first portion.
According to the present invention from another aspect there is provided a disposable syringe that may be used only once, comprising:
a cylindrical tubular member, one of whose ends terminates at a narrowing into which a needle may be fitted and into the other end of which a plunger is received, the plunger being provided with a cylinder having at least one sealed joint wherein:
the cylinder is hollow and has two bases and in its interior is located an end conical portion of the plunger by means of which and during an injection one of the bases is perforated at a zone opposite the end of the plunger, the conical portion providing an enlargement which presents displacement of the conical portion out of the interior of the cylinder; and the other base of the cylinder has at least one opening so that after said perforation is made, the sealed tightness of the syringe is broken, making it impossible for said syringe to effect a second suction.
The present invention will now be described, by way of example, with reference to the accompanying drawing in which:
Figure 1 is a sectional view of a syringe according to an example of the present invention ready for suction;
Figure 2 is a sectional view of such a syringe during injection;
Figure 3 is a sectional view of such a syringe after injection.
The syringe 1 represented in the Figures comprises an outer cylindrical tubular member 2, one of whose ends terminates at an axial narrowing 3 providing an orifice in which a needle, which is not shown, could be fitted.
A generally cylindrical partition member 4 defined by a cylindrical surface 5, two caps 6 and 7 and two collars 13 is slidably mounted within the tubular member 2 in such a way that an air-tight seal is formed at at least one of the interfaces between the collars 13 and the tubular member 2. The cap 6 is provided with a plurality of passageways 8 passing through the cap and a passageway through which a plunger 10, which is slidable with respect to the partition member 4, extends.
The plunger is provided with an end portion 9 at or near the end of the plunger closest to the axial narrowing and the end portion includes a conical head 12 and a flange 15.
Cap 7 is provided with a frangible portion 11 which is sited in such a position that it may be perforated by the conical head when the plunger is slid with respect to the partition member 4. The flange 15 is sufficiently large not to pass through the passageway or through the frangible portion 11 and forms a seal across the site of the frangible portion 11 when it is pressed in place thereon.
As shown in Figure 1, when the syringe is first to be used the plunger 10 is slid relative to the tubular member 2 and to the partition member 4 in a direction away from the axial narrowing 3 (as indicated by the arrow in that Figure) until the flange 15 bears upon the cap 6. Further movement of the plunger 10 relative to the tubular member 2 and away from the axial narrowing 3 forces the partition member 4 to slide in the tubular member and, by virtue of the fact that the member 4 imposes an air-tight seal between the chambers on opposite sides of cap 7, the substance which it is desired to inject may be sucked through the axial narrowing.
To perform the injection and expel from the syringe the substance which it is desired to inject, the plunger 10 is slid relative to the tubular member 2 and to the partition member 4 in a direction towards the axial narrowing (as indicated by the arrow in Figure 2) until the tip of the conical head 12 meets and perforates the frangible portion 11 and the flange 15 bears upon the cap 7 and forms a seal across the site of the perforated portion as shown in Figure 2. Further movement of the plunger 10 relative to the tubular member and towards the axial narrowing urges the flange against the cap 7 so as to further improve the seal over the site of the perforated portion and forces the partition member to slide in the tubular member.By virtue of the fact that the partition member and the end portion 13 with the flange 15 impose an air-tight seal between the chambers on opposite sides of face 7, the substance which it is desired to inject may be expelled through the axial narrowing.
If an attempt is made to re-use the syringe and the plunger is again slid relative to the tubular member 2 and to the partition member 4 in a direction away from the axial narrowing 3 (as indicated by the arrow in
Figure 3), the end portion 13 will move away from the cap 7, uncovering the perforated portion 16, until the flange is brought to bear upon the cap 6 as shown in
Figure 6. Further movement of the plunger relative to the tubular member and in a direction away from the axial narrowing will again force the partition member 4 to slide in the tubular member but because the chambers on opposite sides of the partition member 4 are connected through passageways 8 and the perforated portion 16 nothing may be sucked through the axial narrowing in normal use. The syringe- is therefore unserviceable after only one use.
Claims (5)
1. A disposable syringe comprising:
an elongate hollow member which is provided with an orifice into which a needle may be fitted;
a partition which is slidably mounted within the hollow member, forms a seal between chambers within the hollow member on opposite sides of the partition and comprises a first, frangible portion and a second portion;
a plunger which is received in the hollow member and which comprises an end portion which is engageable with the second portion for urging the partition to slide within the hollow member in a direction away from the orifice and is engageable with the first portion for urging the plunger both to slide within the hollow member in a direction towards the orifice and also to break the first portion and create a passageway between said chambers, which passageway is open if said plunger is removed from engagement with said first portion.
2. A syringe as claimed in claim 1 wherein said second portion comprises a transverse portion having at least one passageway through it.
3. A syringe as claimed in any preceding claim wherein the partition is provided with at least one annular rib in sealing engagement with the hollow member.
4. A disposable syringe that may be used only once, comprising:
a cylindrical tubular member, one of whose ends terminates at a narrowing into which a needle may be fitted and into the other end of which a plunger is received, the plunger being provided with a cylinder having at least one sealed joint wherein:
the cylinder is hollow and has two bases and in its interior is located an end conical portion of the plunger by means of which and during an injection one of the bases is perforated at a zone opposite the end of the plunger, the conical portion providing an enlargement which presents displacement of the conical portion out of the interior of the cylinder; and the other base of the cylinder has at least one opening so that after said perforation is made, the sealed tightness of the syringe is broken, making it impossible for said syringe to effect a second suction.
5. A syringe substantially as herein described with reference to the accompanying drawing.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES19898903170U ES1011854U (en) | 1989-10-25 | 1989-10-25 | Disposable single-use syringe. (Machine-translation by Google Translate, not legally binding) |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9022324D0 GB9022324D0 (en) | 1990-11-28 |
GB2237511A true GB2237511A (en) | 1991-05-08 |
Family
ID=8263954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9022324A Withdrawn GB2237511A (en) | 1989-10-25 | 1990-10-15 | Non-reusable syringe |
Country Status (5)
Country | Link |
---|---|
DE (1) | DE9014769U1 (en) |
ES (1) | ES1011854U (en) |
FR (1) | FR2654630B3 (en) |
GB (1) | GB2237511A (en) |
IT (1) | IT220641Z2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5246423A (en) * | 1991-11-01 | 1993-09-21 | Farkas Paul J | Remote cannula removal hypodermic syringe |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2706776A1 (en) * | 1993-06-23 | 1994-12-30 | Hammami Alain | Single-use hypodermic syringe |
DE10017475A1 (en) | 2000-04-07 | 2001-10-25 | Degussa | Disposable container for dental filling material |
Citations (5)
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 |
GB2187961A (en) * | 1986-03-22 | 1987-09-23 | Roger Hubert Morley | Disposable syringe |
EP0300694A1 (en) * | 1987-07-21 | 1989-01-25 | Dowty Seals Limited | Non-reusable syringe |
US4863427A (en) * | 1987-03-19 | 1989-09-05 | Pietro Cocchi | Syringe for injections, especially intravenous made to be used only once, without any possibilityof re-aspiration |
WO1989011886A1 (en) * | 1988-06-03 | 1989-12-14 | Clotteau, Jean-Edouard | Single-injection syringe |
-
1989
- 1989-10-25 ES ES19898903170U patent/ES1011854U/en active Pending
-
1990
- 1990-10-15 GB GB9022324A patent/GB2237511A/en not_active Withdrawn
- 1990-10-19 IT IT5331990U patent/IT220641Z2/en active IP Right Grant
- 1990-10-24 FR FR9013194A patent/FR2654630B3/en not_active Expired - Lifetime
- 1990-10-24 DE DE9014769U patent/DE9014769U1/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2187961A (en) * | 1986-03-22 | 1987-09-23 | Roger Hubert Morley | Disposable syringe |
US4687467A (en) * | 1986-06-11 | 1987-08-18 | C.T.F. Research Company | One-time use medical syringe invention |
GB2191405A (en) * | 1986-06-11 | 1987-12-16 | Ctf Research | One-time use medical syringe invention |
US4863427A (en) * | 1987-03-19 | 1989-09-05 | Pietro Cocchi | Syringe for injections, especially intravenous made to be used only once, without any possibilityof re-aspiration |
EP0300694A1 (en) * | 1987-07-21 | 1989-01-25 | Dowty Seals Limited | Non-reusable syringe |
WO1989011886A1 (en) * | 1988-06-03 | 1989-12-14 | Clotteau, Jean-Edouard | Single-injection syringe |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5246423A (en) * | 1991-11-01 | 1993-09-21 | Farkas Paul J | Remote cannula removal hypodermic syringe |
Also Published As
Publication number | Publication date |
---|---|
FR2654630A3 (en) | 1991-05-24 |
IT220641Z2 (en) | 1993-10-07 |
ES1011854U (en) | 1990-06-01 |
IT9053319U1 (en) | 1992-04-19 |
IT9053319V0 (en) | 1990-10-19 |
DE9014769U1 (en) | 1991-01-03 |
FR2654630B3 (en) | 1991-10-31 |
GB9022324D0 (en) | 1990-11-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |