CA2229911A1 - Non-reusable medical syringe - Google Patents
Non-reusable medical syringe Download PDFInfo
- Publication number
- CA2229911A1 CA2229911A1 CA 2229911 CA2229911A CA2229911A1 CA 2229911 A1 CA2229911 A1 CA 2229911A1 CA 2229911 CA2229911 CA 2229911 CA 2229911 A CA2229911 A CA 2229911A CA 2229911 A1 CA2229911 A1 CA 2229911A1
- Authority
- CA
- Canada
- Prior art keywords
- syringe
- plunger
- piston
- section
- 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.)
- 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
- A61M5/50—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
- A61M5/5066—Means for preventing re-use by disconnection of piston and piston-rod
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 non-reusable syringe using the weakness in compression compared to strength in tension of a structural member treat is relatively long compared to its section to provide a syringe which in the ordinary course of expelling liquid from the syringe renders the syringe difficult to reuse.
A section. of the plunger is reduced in section to the point where it is strong enough to pull the piston in order to draw liquid into the syringe but will fail when the plunger is depressed to expel fluid. The plunger remains capable of pushing the piston to expel the liquid but can not be used to retract the piston as it is disconnected from the piston.
A section. of the plunger is reduced in section to the point where it is strong enough to pull the piston in order to draw liquid into the syringe but will fail when the plunger is depressed to expel fluid. The plunger remains capable of pushing the piston to expel the liquid but can not be used to retract the piston as it is disconnected from the piston.
Description
NON-REUS~rBLE MEDICAL SYRINGE
Field of the Invention This invention relates to the field of non-reusable medical :syringes .
Background of the Invention Syringes typically comprise a tubular body within which slides a piston which seals against the walls of the tube.
The movement of the piston is controlled by a plunger which protrude: from one end of the body. The piston seal prevents the passage of air or liquid between the piston and the walls of the tubular body allowing movement of the plunger to draw liquid into or expel liquid through a narrower tube fixed to the end of the tubuJ_ar body opposite from the plunger.
Deliberate or accidental re-use of syringes by untrained people or under unsanitary conditions can lead to the transmission of hepatitis, HIV and other life threatening conditions. This invention is intended to help eliminate the sharing c>f free syringes given to drug addicts. It may also be useful i.n reducing the deliberate or accidental reuse of syringes for multiple patients, which now occurs in various parts of the world with consequent health risks. Deliberate re-use for self administered medication may also occur with lower health risks but if the production or public availability of syringes were confined to non-reusable syringes then even these lower health risk re-uses would be avoided. At the same time accident~~l re-use would be prevented. Although this is an infrequent occurrence, patient confidence will benefit from the absolute certainty that every syringe is unused and sterile.
Summary of the Invention According to the invention, there is provided a disposab7_e syringe in which part of the plunger is replaced with a frangible section. While sufficiently strong to allow the plunger i=o be pulled up to draw liquids into the syringe, this section breaks when the plunger is depressed. After the break, the remainder of the plunger can still be used to expel all of the liquid. The syringe cannot be filled a second time as the plunger handle is now separated from the piston and cannot pull it up. It is important that the separation or break can only be repaired by extensive modification to the syringe requiring tools and adhesives.
Brief Description of the Drav~ings Figure 1 is a schematic longitudinal sectional view of an embodiment of the present invention.
Figure 2 is a schematic longitudinal sectional view of another Embodiment of the present invention.
Figure 3 is a schematic longitudinal sectional view of an alternative frangible section of the plunger in accordance with the present invention.
Figure 4 is a schematic longitudinal sectional view of the syringe of Figure 1 illustrating a method of assembly.
Figure 5 is a schematic longitudinal sectional view of a cap fo:r blocking the end of the needle to cause breakage of the frangible section of the syringes of Figures 1 and 2.
Detailed Description of the Invention A preferred embodiment of the invention is comprised of a syringe illustrated in Figure 1 having a tubular body 3 closed at one end except for a narrow circular opening 4. A
piston 10 slides within the tube 3 and is made of or covered in rubber o:r similar material such that it forms an airtight seal with the wall of the tube 3 at one or a number of rings 9. A
plunger :L4 attaches to the piston 10 by means of a piece 15 at the end of the plunger 14 which can be inserted into a cavity in the piston 10 which, being flexible and shaped to surround the shape on the end of the plunger 14, resists the removal of the plunger 14 with sufficient force that the piston 10 is drawn along the tube 3 when the plunger 14 is withdrawn. At the opposite end to the piston 10, the plunger 14 has a handle 19 to assist in drawing or pushing the plunger 14 and piston 10 along the insi~~e of the syringe body 3. The plunger 14 includes a frangible section 11 that is much smaller in section than the remainder of the plunger 14. This section 11 may be longer in one dimension perpendicular to the cylinder wall than in the other dimension perpendicular to the cylinder wall and may be made of any breakable, relatively inflexible material such as many types of plastic which, in the section as constructed, cannot be bent more than about 45 degrees without brittle failure. While there is adequate material in this section 11 of the plunger 14 to provide the pull on the piston 10 required to draw liquid into the syringe, on the return stroke, when the plunger rnaterial is in compression, this section 11 will bend and break. All dimensions of the frangible section 11 may be varied to suit the material used to form the plunger 14 such that thi:~ section 11 will break when the plunger 14 is used to expel liquid of any viscosity from the syringe. The frangible section 7_1 can be composed of two or more parallel pieces that operate in the same way. After the frangible section 11 has broken, the plunger 14 can still push the piston 10 down to expel the liquid but cannot pull the piston 10 up again and the syringe therefore cannot be refilled. The wide mating sections 13, 16 of the plunger 14 either side of the frangible section 11 are required to hold the plunger 14 in the centre of the cylinder bore so that pressure on the plunger 14 by the user is exerted at the centre of the piston 10 for smooth operation once the frangible section 11 is broken. These wide flat mating sections 13, 16 also help prevent the user from making the syringe reusable by withdrawing the plunger 14 completely from the cylinder 3, placing an adhesive on the end of the mating section 1.3, reinserting it into the cylinder 3 and then pushing it against mating section 16, so that after the glue has set, the piston 10 can be withdrawn again because the wide, flat surfaces of mating sections 13, 16 would tend to squeeze adhesive out to the edges where it would adhere to the cylinder walls locking the plunger 14 and piston 10 in place. The cross-section of the rest of the plunger 14 may be any size or shape that will provide enough strength to push the piston 10 along they inside syringe body 3. The additional finger holds 12 may be provided to fill the bore of the syringe around the plunger 14 to make it more difficult to withdraw the broken plunger 1.4 in order to either repair it or strengthen it before using it. The needle 1 may be attached to the body of the syringe :3 in such a way as to prevent removal of the needle 1 for access to the inside of the syringe without rendering reattachment of the needle 1 very difficult. User access to the inside o_' the syringe at the needle end of the body may allow the user to insert a tool to push the piston 10 to the other end of the syringe to make repair of the frangible section 11 easier. By preventing this access, the syringe is made more difficult: to reuse. Figure 1 shows one method of achieving this. Th.e body 3 of the syringe is formed with a nozzle 8 that has a hole 4 of the same diameter as the inside of the needle 1.
The need7_e 1 is connected to the nozzle 8 by a circular cap 2, which pulls the flanges 6 on the needle 1 onto the top of a nozzle 8. The nozzle 8 on the cylinder 3 has retaining lugs 5, which hold the cap 2 in place. Any attempt to remove the needle 1 will break the cap 2, which is weaker than the thicker sectioned nozzle 8 or the metal needle 1, and thus prevent the syringe :From being reused. The collar 17 is placed around the plunger 14 after manufacture and assembly of the syringe to prevent accidental pressure on the handle 19 during transport breaking the frangible section 11 of the plunger 14.
In the embodiment in Figure 2 the piston 10 and plunger :L4 meet as deeply concave surfaces. The narrow lip 21 of the piston 10, which meets the narrow lip 22 of the plunger 14, is formed as part of the same flexible piece that forms the seal 9 and therefore will deform when the plunger 14 is depressed. This compresses the frangible piece 11 which breaks before the force absorbed by the deformation of the flexible piece 21 becomes sufficient to overcome the friction between the piston 1C) and the syringe wall 3. This arrangement reduces the shock delivered to the entire apparatus when the frangible section 1.1 breaks. This arrangement also reduces the chance of repairing the broken plunger by gluing the pieces together since the only surfaces available to allow the user or potential reuser to repair the syringe by gluing are those surfaces 21 22 most intimately in contact with the cylinder wall. This arrangement also has the advantage of hiding from the user the means used to make the syringe non-reusable. The gap 20 can be adjusted at manufacture according to the flexibility of the material used for the piston lip 21 and the compression required to break the frangible piece 11. The lip 21 of the piston 10 where it meets the plunger 22 may be castellated to increase its ability t:o deform before the piston begins to move.
In Figure 5 a small piece of sterile rubber or plastic 33 is illustrated which includes a recess 34 shaped to match the needle 1 and which can be used to block the end of the needle 1.
Just before the syringe is used to inject a patient, the needle 1 is inserted into the recess 34 and the plunger handle 19 pressed t:o break the frangible piece 11 before the needle 1 is put into the patient's arm thus eliminating possible discomfort that the patient might feel if the frangible piece 11 were to break dui°ing injection.
In the embodiment in Figure 3 the frangible section 11 is weakened by notches formed at the connections 30 to the piston 1C1 and the plunger 14 and in the centre of the frangible piece 11. These notches 30 ensure that the frangible section 11 breaks of:f easily and cleanly leaving the faces of sections 13, 16 facing each other as free from projections as possible.
In the embodiment in Figure 2 the flanges 6 of the needle 1 are embedded in a thickened area 24 of the bottom of the cylinder 3. This prevents user access to the inside of the syringe as discussed above but with a less complicated design.
In the embodiment in Figure 1 the face 7 of the piston 10 which expels the liquid from the cylinder 3 has a concave face 7 tc> replace the normally used flat face. When the piston 10 contacts the bottom of the cylinder 3, the liquid at the edges is squeezed towards the centre of the syringe first and the circle of liquid between the rubber piston and the cylinder bottom is gradually reduced from the outside in as the piston 10 descends ensuring minimal liquid is left the bottom of the syringe.
The frangible section 11 of the plunger 14 may also be formed by moulding the plunger with a short section of small cross secaion with notches 30 formed close to the faces of the sections 13, 16 in Figure 3. The frangible section 11 may then be embrit;tled and narrowed by stretching. This is useful with certain plastics that would otherwise be too flexible too break completely.
Assembly of embodiments of the invention requires special care as the plunger 14 and piston 10 must be pushed into the cylinder 3 without breaking the frangible section 11 and the syringe .must be shipped with the piston 10 tight against the bottom of the cylinder 3. To overcome this problem, in the embodiment in Figure 2 the end of the plunger 14 is shaped like the head of a harpoon 23 and the centre of the piston 10 is shaped to allow easy entry of the harpoon shape but will not allow it to pull out again. This allows the syringe to be assembled by pushing the piston 10 to the bottom of the cylinder with a tool and then inserting the plunger head 23 into the piston. This avoids the plunger 14 having to push the piston 10 to the bottom of the cylinder 3, which could break the frangible piece 11.
The piston 10 and plunger 14 may also be assembled outside of the cylinder 3 and then drawn into the cylinder 3 by the application of suction to the needle 1 to remove air in front of the piston 10 allowing atmospheric pressure to push the piston 10 to the bottom of the cylinder 3.
As illustrated in Figure 4, the syringe of Figure 1 can also be assembled by using a metal tube 26 which slides over the cylinder 3 from the needle 1 end of the syringe and forces the finger holds 31 against another metal cylinder 28. The piston 10 and plunger 14 are assembled separately and then introduced to the tube 28 so that the piston 10 enters the smaller diameter area 32 of the tube 28 and contacts the end of the cylinder 3. Air 29 is then forced into the larger diameter end of the tube 28. Air pressure will then force the piston 10 to move down the cylinder 3 since the gaps 25 between the plunger 14 and the cylinder 3 do not prevent the passage of air.
A rubber or other seal of the many types available may be provided where the finger holds 31 meet the tube 28 at surface 35.
Field of the Invention This invention relates to the field of non-reusable medical :syringes .
Background of the Invention Syringes typically comprise a tubular body within which slides a piston which seals against the walls of the tube.
The movement of the piston is controlled by a plunger which protrude: from one end of the body. The piston seal prevents the passage of air or liquid between the piston and the walls of the tubular body allowing movement of the plunger to draw liquid into or expel liquid through a narrower tube fixed to the end of the tubuJ_ar body opposite from the plunger.
Deliberate or accidental re-use of syringes by untrained people or under unsanitary conditions can lead to the transmission of hepatitis, HIV and other life threatening conditions. This invention is intended to help eliminate the sharing c>f free syringes given to drug addicts. It may also be useful i.n reducing the deliberate or accidental reuse of syringes for multiple patients, which now occurs in various parts of the world with consequent health risks. Deliberate re-use for self administered medication may also occur with lower health risks but if the production or public availability of syringes were confined to non-reusable syringes then even these lower health risk re-uses would be avoided. At the same time accident~~l re-use would be prevented. Although this is an infrequent occurrence, patient confidence will benefit from the absolute certainty that every syringe is unused and sterile.
Summary of the Invention According to the invention, there is provided a disposab7_e syringe in which part of the plunger is replaced with a frangible section. While sufficiently strong to allow the plunger i=o be pulled up to draw liquids into the syringe, this section breaks when the plunger is depressed. After the break, the remainder of the plunger can still be used to expel all of the liquid. The syringe cannot be filled a second time as the plunger handle is now separated from the piston and cannot pull it up. It is important that the separation or break can only be repaired by extensive modification to the syringe requiring tools and adhesives.
Brief Description of the Drav~ings Figure 1 is a schematic longitudinal sectional view of an embodiment of the present invention.
Figure 2 is a schematic longitudinal sectional view of another Embodiment of the present invention.
Figure 3 is a schematic longitudinal sectional view of an alternative frangible section of the plunger in accordance with the present invention.
Figure 4 is a schematic longitudinal sectional view of the syringe of Figure 1 illustrating a method of assembly.
Figure 5 is a schematic longitudinal sectional view of a cap fo:r blocking the end of the needle to cause breakage of the frangible section of the syringes of Figures 1 and 2.
Detailed Description of the Invention A preferred embodiment of the invention is comprised of a syringe illustrated in Figure 1 having a tubular body 3 closed at one end except for a narrow circular opening 4. A
piston 10 slides within the tube 3 and is made of or covered in rubber o:r similar material such that it forms an airtight seal with the wall of the tube 3 at one or a number of rings 9. A
plunger :L4 attaches to the piston 10 by means of a piece 15 at the end of the plunger 14 which can be inserted into a cavity in the piston 10 which, being flexible and shaped to surround the shape on the end of the plunger 14, resists the removal of the plunger 14 with sufficient force that the piston 10 is drawn along the tube 3 when the plunger 14 is withdrawn. At the opposite end to the piston 10, the plunger 14 has a handle 19 to assist in drawing or pushing the plunger 14 and piston 10 along the insi~~e of the syringe body 3. The plunger 14 includes a frangible section 11 that is much smaller in section than the remainder of the plunger 14. This section 11 may be longer in one dimension perpendicular to the cylinder wall than in the other dimension perpendicular to the cylinder wall and may be made of any breakable, relatively inflexible material such as many types of plastic which, in the section as constructed, cannot be bent more than about 45 degrees without brittle failure. While there is adequate material in this section 11 of the plunger 14 to provide the pull on the piston 10 required to draw liquid into the syringe, on the return stroke, when the plunger rnaterial is in compression, this section 11 will bend and break. All dimensions of the frangible section 11 may be varied to suit the material used to form the plunger 14 such that thi:~ section 11 will break when the plunger 14 is used to expel liquid of any viscosity from the syringe. The frangible section 7_1 can be composed of two or more parallel pieces that operate in the same way. After the frangible section 11 has broken, the plunger 14 can still push the piston 10 down to expel the liquid but cannot pull the piston 10 up again and the syringe therefore cannot be refilled. The wide mating sections 13, 16 of the plunger 14 either side of the frangible section 11 are required to hold the plunger 14 in the centre of the cylinder bore so that pressure on the plunger 14 by the user is exerted at the centre of the piston 10 for smooth operation once the frangible section 11 is broken. These wide flat mating sections 13, 16 also help prevent the user from making the syringe reusable by withdrawing the plunger 14 completely from the cylinder 3, placing an adhesive on the end of the mating section 1.3, reinserting it into the cylinder 3 and then pushing it against mating section 16, so that after the glue has set, the piston 10 can be withdrawn again because the wide, flat surfaces of mating sections 13, 16 would tend to squeeze adhesive out to the edges where it would adhere to the cylinder walls locking the plunger 14 and piston 10 in place. The cross-section of the rest of the plunger 14 may be any size or shape that will provide enough strength to push the piston 10 along they inside syringe body 3. The additional finger holds 12 may be provided to fill the bore of the syringe around the plunger 14 to make it more difficult to withdraw the broken plunger 1.4 in order to either repair it or strengthen it before using it. The needle 1 may be attached to the body of the syringe :3 in such a way as to prevent removal of the needle 1 for access to the inside of the syringe without rendering reattachment of the needle 1 very difficult. User access to the inside o_' the syringe at the needle end of the body may allow the user to insert a tool to push the piston 10 to the other end of the syringe to make repair of the frangible section 11 easier. By preventing this access, the syringe is made more difficult: to reuse. Figure 1 shows one method of achieving this. Th.e body 3 of the syringe is formed with a nozzle 8 that has a hole 4 of the same diameter as the inside of the needle 1.
The need7_e 1 is connected to the nozzle 8 by a circular cap 2, which pulls the flanges 6 on the needle 1 onto the top of a nozzle 8. The nozzle 8 on the cylinder 3 has retaining lugs 5, which hold the cap 2 in place. Any attempt to remove the needle 1 will break the cap 2, which is weaker than the thicker sectioned nozzle 8 or the metal needle 1, and thus prevent the syringe :From being reused. The collar 17 is placed around the plunger 14 after manufacture and assembly of the syringe to prevent accidental pressure on the handle 19 during transport breaking the frangible section 11 of the plunger 14.
In the embodiment in Figure 2 the piston 10 and plunger :L4 meet as deeply concave surfaces. The narrow lip 21 of the piston 10, which meets the narrow lip 22 of the plunger 14, is formed as part of the same flexible piece that forms the seal 9 and therefore will deform when the plunger 14 is depressed. This compresses the frangible piece 11 which breaks before the force absorbed by the deformation of the flexible piece 21 becomes sufficient to overcome the friction between the piston 1C) and the syringe wall 3. This arrangement reduces the shock delivered to the entire apparatus when the frangible section 1.1 breaks. This arrangement also reduces the chance of repairing the broken plunger by gluing the pieces together since the only surfaces available to allow the user or potential reuser to repair the syringe by gluing are those surfaces 21 22 most intimately in contact with the cylinder wall. This arrangement also has the advantage of hiding from the user the means used to make the syringe non-reusable. The gap 20 can be adjusted at manufacture according to the flexibility of the material used for the piston lip 21 and the compression required to break the frangible piece 11. The lip 21 of the piston 10 where it meets the plunger 22 may be castellated to increase its ability t:o deform before the piston begins to move.
In Figure 5 a small piece of sterile rubber or plastic 33 is illustrated which includes a recess 34 shaped to match the needle 1 and which can be used to block the end of the needle 1.
Just before the syringe is used to inject a patient, the needle 1 is inserted into the recess 34 and the plunger handle 19 pressed t:o break the frangible piece 11 before the needle 1 is put into the patient's arm thus eliminating possible discomfort that the patient might feel if the frangible piece 11 were to break dui°ing injection.
In the embodiment in Figure 3 the frangible section 11 is weakened by notches formed at the connections 30 to the piston 1C1 and the plunger 14 and in the centre of the frangible piece 11. These notches 30 ensure that the frangible section 11 breaks of:f easily and cleanly leaving the faces of sections 13, 16 facing each other as free from projections as possible.
In the embodiment in Figure 2 the flanges 6 of the needle 1 are embedded in a thickened area 24 of the bottom of the cylinder 3. This prevents user access to the inside of the syringe as discussed above but with a less complicated design.
In the embodiment in Figure 1 the face 7 of the piston 10 which expels the liquid from the cylinder 3 has a concave face 7 tc> replace the normally used flat face. When the piston 10 contacts the bottom of the cylinder 3, the liquid at the edges is squeezed towards the centre of the syringe first and the circle of liquid between the rubber piston and the cylinder bottom is gradually reduced from the outside in as the piston 10 descends ensuring minimal liquid is left the bottom of the syringe.
The frangible section 11 of the plunger 14 may also be formed by moulding the plunger with a short section of small cross secaion with notches 30 formed close to the faces of the sections 13, 16 in Figure 3. The frangible section 11 may then be embrit;tled and narrowed by stretching. This is useful with certain plastics that would otherwise be too flexible too break completely.
Assembly of embodiments of the invention requires special care as the plunger 14 and piston 10 must be pushed into the cylinder 3 without breaking the frangible section 11 and the syringe .must be shipped with the piston 10 tight against the bottom of the cylinder 3. To overcome this problem, in the embodiment in Figure 2 the end of the plunger 14 is shaped like the head of a harpoon 23 and the centre of the piston 10 is shaped to allow easy entry of the harpoon shape but will not allow it to pull out again. This allows the syringe to be assembled by pushing the piston 10 to the bottom of the cylinder with a tool and then inserting the plunger head 23 into the piston. This avoids the plunger 14 having to push the piston 10 to the bottom of the cylinder 3, which could break the frangible piece 11.
The piston 10 and plunger 14 may also be assembled outside of the cylinder 3 and then drawn into the cylinder 3 by the application of suction to the needle 1 to remove air in front of the piston 10 allowing atmospheric pressure to push the piston 10 to the bottom of the cylinder 3.
As illustrated in Figure 4, the syringe of Figure 1 can also be assembled by using a metal tube 26 which slides over the cylinder 3 from the needle 1 end of the syringe and forces the finger holds 31 against another metal cylinder 28. The piston 10 and plunger 14 are assembled separately and then introduced to the tube 28 so that the piston 10 enters the smaller diameter area 32 of the tube 28 and contacts the end of the cylinder 3. Air 29 is then forced into the larger diameter end of the tube 28. Air pressure will then force the piston 10 to move down the cylinder 3 since the gaps 25 between the plunger 14 and the cylinder 3 do not prevent the passage of air.
A rubber or other seal of the many types available may be provided where the finger holds 31 meet the tube 28 at surface 35.
Claims (2)
1. A syringe having a piston and a plunger connected by a frangible section that is weaker in compression than in tension so that the syringe may be filled without breakage of the frangible section, but upon use of the syringe for injection the frangible section will break disconnecting the piston from the plunger, thereby rendering the syringe non-reusable.
2. The syringe of claim 1, wherein the frangible section is comprised plastic embrittled and narrowed by stretching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2229911 CA2229911A1 (en) | 1998-02-19 | 1998-02-19 | Non-reusable medical syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2229911 CA2229911A1 (en) | 1998-02-19 | 1998-02-19 | Non-reusable medical syringe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2229911A1 true CA2229911A1 (en) | 1999-08-19 |
Family
ID=29409301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2229911 Abandoned CA2229911A1 (en) | 1998-02-19 | 1998-02-19 | Non-reusable medical syringe |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2229911A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2416698A (en) * | 2004-08-04 | 2006-02-08 | Tyrone Michael Meadows | Single use syringe with needle cover |
-
1998
- 1998-02-19 CA CA 2229911 patent/CA2229911A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2416698A (en) * | 2004-08-04 | 2006-02-08 | Tyrone Michael Meadows | Single use syringe with needle cover |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |