US20040230159A1 - Safety syringe - Google Patents
Safety syringe Download PDFInfo
- Publication number
- US20040230159A1 US20040230159A1 US10/437,607 US43760703A US2004230159A1 US 20040230159 A1 US20040230159 A1 US 20040230159A1 US 43760703 A US43760703 A US 43760703A US 2004230159 A1 US2004230159 A1 US 2004230159A1
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- US
- United States
- Prior art keywords
- buckling
- lip
- syringe
- wall
- unidirectional
- 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.)
- Granted
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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- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
-
- 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
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
- A61M2005/31516—Piston or piston-rod constructions, e.g. connection of piston with piston-rod reducing dead-space in the syringe barrel after delivery
-
- 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
- A61M2005/5073—Means for preventing re-use by disconnection of piston and piston-rod by breaking or rupturing the connection parts
-
- 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
- A61M5/347—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub rotatable, e.g. bayonet or screw
-
- 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
- A61M5/348—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub snap lock, i.e. upon axial displacement of needle assembly
Definitions
- the present invention relates to syringes, and particularly to a safety syringe having a simple structure so that it can not be reused.
- the prior art syringe includes a syringe 10 , a seat 20 and a push rod 30 .
- the syringe 10 is a round cylinder penetrated from the front end to the rear end.
- a stop wall 11 is radially arranged to be at an inner wall of the syringe 10 near the front end thereof.
- An annular first unidirectional buckling lip 13 is installed at an inner wall of the rear side of the syringe 10 .
- a front end of the seat 20 is a sleeve 21 for connecting a needle 40 .
- a seat has a liquid flow channel 22 which penetrates the front and rear ends of the syringe and at an axial center thereof.
- a rear end of the liquid flow channel 22 is formed with an unidirectional buckling chamber 23 .
- An outer wall of the seat 20 is formed with an annular groove 24 with respect to the first lip 12 at a front end of the syringe 10 .
- the front end of the push rod 30 has a rod head 31 .
- a plurality of connecting points 32 serves for connecting the push rod 30 with the rod head 31 so as to be formed as a breaking section 33 by which the rod head 31 is broken after use.
- the rod head 31 has a second water-stop ring 34 .
- a front end of the rod head 31 has a tapered buckling head 35 .
- the seat 20 and rod head 31 of the push rod 30 can enter into the syringe 10 . Then, the seat 20 can be pushed into the first lip 12 at the front end of the syringe 10 so as to be buckled to a front end of the syringe 10 .
- the sleeve 21 at a front end of the seat 20 protrudes from the front end of the syringe 10 . Thereby, needle 40 can be screwed into the syringe 10 (referring to FIG. 1).
- the buckling head 35 at the front end of the rod head 31 can be pressed into the unidirectional buckling chamber 23 at a rear end of the seat 20 (referring to FIG. 2).
- the push rod 30 is pulled backwards and at the same time, the seat 20 is retracted so that the needle 40 can be placed into the syringe 10 (referring to FIG. 3). Further, the needle 40 is retracted to be stored in the syringe 10 .
- the rod head 31 is broken to separate from the push rod 30 (referring to FIG. 4). Thereby, the syringe 10 can be not reused. Thereby, the object of safety is achieved.
- a front end of the liquid flow channel 22 of the seat 20 has a space which would accumulates drugs therein so that when the push rod 30 is pushed to the foremost end, part of the drug will flow into the liquid flow channel 22 .
- the amount of the drug is over the international standard, 0.075 ml.
- the primary object of the present invention is to provide a safety syringe, which can improve prior art defects as mentioned above.
- the present invention provides a safety syringe, wherein plurality of axial slits are formed in the outer wall of the unidirectional buckling chamber of the seat.
- An inner wall of the unidirectional buckling chamber has a second unidirectional buckling lip.
- a buckling head at a front end of the rod head of the push rod is installed with a unidirectional buckling lip; the third unidirectional buckling lip is installed with a plurality of slits so that the third unidirectional buckling lip is elastic.
- the buckling head at the front end of the rod head is pushed into the unidirectional buckling chamber at the rear end of the rod head of the push rod.
- the buckling head at the front end of the rod head of the push rod is extended with an axial strip.
- FIG. 1 is a cross section view showing the structure of a prior art syringe.
- FIG. 2 is another cross section view showing the structure of a prior art syringe.
- FIG. 3 is yet a cross section view showing the structure of a prior art syringe.
- FIG. 4 is still a cross section view showing the structure of a prior art syringe.
- FIG. 5 is a partial cross section view showing that a prior art syringe seat is plugged into a front end of the syringe.
- FIG. 6 shows the perspective view of the present invention.
- FIG. 7 is a first schematic cross section view of the present invention.
- FIG. 8 is a second schematic cross section view of the present invention.
- FIG. 9 is a third schematic cross section view of the present invention.
- FIG. 10 is a fourth schematic cross section view of the present invention.
- FIG. 11 is a partial enlarge cross section view showing that the seat of the present invention is plugged into a front end of a syringe.
- FIG. 12 is a cross section view along line I-I of FIG. 11.
- FIGS. 6 to 12 the present invention will be described herein with the appended drawings.
- the present invention includes a syringe 50 , a seat 60 and a push rod 70 .
- the syringe 50 is a round cylinder penetrated from the front end to the rear end.
- a stop wall 52 is radially arranged to be at an inner wall of the syringe 50 near the front end thereof.
- An annular first lip is formed at a rear end of the stop wall.
- An annular groove 53 is formed between the rear side of the stop wall 51 and the first lip 52 .
- An annular first unidirectional buckling lip 54 is installed at an inner wall of the rear side of the syringe 50 .
- a seat 60 has a liquid flow channel 61 which penetrates the front and rear ends of the syringe 50 and at an axial center thereof.
- a front end of the liquid flow channel 61 has a connecting end 62 for connecting a needle of the syringe 50 .
- a periphery of the connecting end 62 has an enclosing wall 63 .
- An outer wall of the enclosing wall 63 has a second lip 631 annularly arranged around the enclosing wall 63 . The second lip 631 is exactly corresponding to the groove 53 at the front end syringe 50 .
- a plurality of tips 632 are formed on the second lip 631 so as to increase the tightness of the seat 60 to the front end of the syringe 50 .
- the preciseness of the seat 60 in manufacturing can be retained without being affected by the heat expansion and cool contraction. Thereby, the yield of the syringe can be increased and the syringe seat 60 can suffer from a larger pull force over 3 kg.
- An outer wall of the seat 60 has an annular slot 64 which is corresponding to the annular first lip 52 at the inner wall of the front end of the syringe 50 .
- the enclosing wall 63 has a plurality of axial slits 633 so that the enclosing wall 63 is reduceable.
- An inner wall of the enclosing wall 63 has an inner thread 634 for screwing the syringe needle 80 to the connecting end 62 .
- a rear end of the liquid flow channel 61 has a unidirectional buckling chamber 65 and a first water-stop ring 66 is at a periphery of the unidirectional buckling chamber 65 for preventing drainage of liquid from the contact surface of the seat 60 and the syringe 50 .
- a push rod 70 (referring to FIGS. 6, 7) has a front end.
- the front end has a rod head 71 .
- a plurality of connecting points 72 serve for connecting the push rod 70 with the rod head 71 so as to be formed as a breaking section 73 by which the rod head 71 is broken after use.
- the rod head 71 has a second water-stop ring 74 .
- a front end of the rod head 71 has a tapered buckling head 75 .
- An upper periphery of the rod head 71 is installed with a plurality of unidirectional buckling pieces 76 .
- the seat 60 and rod head 71 of the push rod 70 can enter into the syringe 50 .
- the second lip 631 of the seat 60 can be pushed into the first lip 52 at the front end of the syringe 50 so as to be buckled to the groove 53 between the stop wall 51 and the first lip 52 so that the seat 60 is placed at a front end of the syringe 50 .
- the sleeve 61 at a front end of the seat 60 protrudes from the front end of the syringe 50 .
- needle 80 can be screwed into the syringe 50 (referring to FIG. 7).
- the buckling head 75 at the front end of the rod head 71 can be pressed into the unidirectional buckling chamber 65 at a rear end of the seat 60 (referring to FIG. 8).
- the seat 60 is retracted so that the needle 80 can be placed into the syringe 50 (referring to FIG. 9).
- the needle 80 is retracted to be stored in the syringe 50 .
- the rod head 71 is broken to separate from the push rod 70 (referring to FIG. 10). Thereby, the syringe 50 can be not reused. Thereby, the object of safety is achieved.
- a plurality of axial slits 67 are formed in the outer wall of the unidirectional buckling chamber 65 of the seat 60 .
- the inner wall of the unidirectional buckling chamber 65 has a second unidirectional buckling lip 68 (referring to FIG. 7).
- the buckling head 75 at a front end of the rod head 71 of the push rod 70 is installed with a third unidirectional buckling lip 77 .
- the third unidirectional buckling lip 77 is installed with a plurality of slits 78 so that the third unidirectional buckling lip 77 is elastic.
- the buckling head 75 at the front end of the rod head 71 of the push rod 70 is extended with an axial strip 79 (referring to FIG. 6).
- the axial strip 77 can be inserted into the liquid flow channel 61 of the seat 60 (referring to FIG. 8), the liquid in the liquid flow channel 61 can be pushed out so as to reduce the residue of the liquid to match the international standard.
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (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 safety syringe is disclosed. A plurality of axial slits are formed in the outer wall of the unidirectional buckling chamber of the seat. An inner wall of the unidirectional buckling chamber has a second unidirectional buckling lip. A buckling head at a front end of the rod head of the push rod is installed with a unidirectional buckling lip; the third unidirectional buckling lip is installed with a plurality of slits so that the third unidirectional buckling lip is elastic. Thereby, by the axial slits of the unidirectional buckling chamber and the slits of the third unidirectional buckling lip, when the push rod is pushed to a foremost end, the buckling head at the front end of the rod head is pushed into the unidirectional buckling chamber at the rear end of the rod head of the push rod.
Description
- The present invention relates to syringes, and particularly to a safety syringe having a simple structure so that it can not be reused.
- With reference to FIGS.1 to 4, the prior art syringe includes a
syringe 10, aseat 20 and apush rod 30. - The
syringe 10 is a round cylinder penetrated from the front end to the rear end. Astop wall 11 is radially arranged to be at an inner wall of thesyringe 10 near the front end thereof. An annular firstunidirectional buckling lip 13 is installed at an inner wall of the rear side of thesyringe 10. - A front end of the
seat 20 is asleeve 21 for connecting aneedle 40. A seat has aliquid flow channel 22 which penetrates the front and rear ends of the syringe and at an axial center thereof. A rear end of theliquid flow channel 22 is formed with anunidirectional buckling chamber 23. An outer wall of theseat 20 is formed with anannular groove 24 with respect to thefirst lip 12 at a front end of thesyringe 10. - The front end of the
push rod 30 has arod head 31. A plurality of connectingpoints 32 serves for connecting thepush rod 30 with therod head 31 so as to be formed as a breakingsection 33 by which therod head 31 is broken after use. Therod head 31 has a second water-stop ring 34. A front end of therod head 31 has a taperedbuckling head 35. - By above mentioned structure, the
seat 20 androd head 31 of thepush rod 30 can enter into thesyringe 10. Then, theseat 20 can be pushed into thefirst lip 12 at the front end of thesyringe 10 so as to be buckled to a front end of thesyringe 10. Thesleeve 21 at a front end of theseat 20 protrudes from the front end of thesyringe 10. Thereby,needle 40 can be screwed into the syringe 10 (referring to FIG. 1). When thepush rod 30 is pushed to a foremost end, thebuckling head 35 at the front end of therod head 31 can be pressed into theunidirectional buckling chamber 23 at a rear end of the seat 20 (referring to FIG. 2). Next, thepush rod 30 is pulled backwards and at the same time, theseat 20 is retracted so that theneedle 40 can be placed into the syringe 10 (referring to FIG. 3). Further, theneedle 40 is retracted to be stored in thesyringe 10. Then therod head 31 is broken to separate from the push rod 30 (referring to FIG. 4). Thereby, thesyringe 10 can be not reused. Thereby, the object of safety is achieved. - However when the
push rod 30 is pushed to the foremost end (referring to FIG. 5), thebuckling head 35 at the foremost is plugged into theunidirectional buckling chamber 23 at the rear end of theseat 20 so that theseat 30 is firmly secured to thepush rod 30. When thepush rod 30 is pulled backwards, theseat 30 can be pulled out at the same time. Thereby, theneedle 40 is stored in thesyringe 10. Thus, thebuckling head 35 at the front end of thepush rod 30 is easily plugged into theunidirectional buckling chamber 23 at the rear end of theseat 20. To cause that the bucklinghead 35 will not separate from theunidirectional buckling chamber 23 and can drive theseat 20 to move backwards when thepush rod 30 moves backwards. A high precision is necessary so that it is difficult to make, maintain and prepare a mold. As a result, the cost is increased Moreover, to control the precision of thebuckling head 35 and theunidirectional buckling chamber 23 is difficult so that the quality can not be well controlled. - Further, a front end of the
liquid flow channel 22 of theseat 20 has a space which would accumulates drugs therein so that when thepush rod 30 is pushed to the foremost end, part of the drug will flow into theliquid flow channel 22. The amount of the drug is over the international standard, 0.075 ml. - Accordingly, the primary object of the present invention is to provide a safety syringe, which can improve prior art defects as mentioned above.
- To achieve above objects, the present invention provides a safety syringe, wherein plurality of axial slits are formed in the outer wall of the unidirectional buckling chamber of the seat. An inner wall of the unidirectional buckling chamber has a second unidirectional buckling lip. A buckling head at a front end of the rod head of the push rod is installed with a unidirectional buckling lip; the third unidirectional buckling lip is installed with a plurality of slits so that the third unidirectional buckling lip is elastic. Thereby, by the axial slits of the unidirectional buckling chamber and the slits of the third unidirectional buckling lip, when the push rod is pushed to a foremost end, the buckling head at the front end of the rod head is pushed into the unidirectional buckling chamber at the rear end of the rod head of the push rod. The buckling head at the front end of the rod head of the push rod is extended with an axial strip. When the push rod is pushed to a foremost end, the axial strip is inserted into the liquid flow channel of the seat, the liquid in the liquid flow channel is pushed out so as to reduce the residue of the liquid so as to match the international standard.
- The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
- FIG. 1 is a cross section view showing the structure of a prior art syringe.
- FIG. 2 is another cross section view showing the structure of a prior art syringe.
- FIG. 3 is yet a cross section view showing the structure of a prior art syringe.
- FIG. 4 is still a cross section view showing the structure of a prior art syringe.
- FIG. 5 is a partial cross section view showing that a prior art syringe seat is plugged into a front end of the syringe.
- FIG. 6 shows the perspective view of the present invention.
- FIG. 7 is a first schematic cross section view of the present invention.
- FIG. 8 is a second schematic cross section view of the present invention.
- FIG. 9 is a third schematic cross section view of the present invention.
- FIG. 10 is a fourth schematic cross section view of the present invention.
- FIG. 11 is a partial enlarge cross section view showing that the seat of the present invention is plugged into a front end of a syringe.
- FIG. 12 is a cross section view along line I-I of FIG. 11.
- Referring to FIGS.6 to 12, the present invention will be described herein with the appended drawings.
- With reference to FIG. 6, the present invention includes a
syringe 50, aseat 60 and apush rod 70. - The
syringe 50, as shown in FIGS. 6 and 7, is a round cylinder penetrated from the front end to the rear end. Astop wall 52 is radially arranged to be at an inner wall of thesyringe 50 near the front end thereof. An annular first lip is formed at a rear end of the stop wall. Anannular groove 53 is formed between the rear side of thestop wall 51 and thefirst lip 52. An annular firstunidirectional buckling lip 54 is installed at an inner wall of the rear side of thesyringe 50. - Referring to FIGS. 6 and 7, a
seat 60 has aliquid flow channel 61 which penetrates the front and rear ends of thesyringe 50 and at an axial center thereof. A front end of theliquid flow channel 61 has a connectingend 62 for connecting a needle of thesyringe 50. A periphery of the connectingend 62 has an enclosingwall 63. An outer wall of the enclosingwall 63 has asecond lip 631 annularly arranged around the enclosingwall 63. Thesecond lip 631 is exactly corresponding to thegroove 53 at thefront end syringe 50. A plurality oftips 632 are formed on thesecond lip 631 so as to increase the tightness of theseat 60 to the front end of thesyringe 50. Moreover, in manufacturing, the preciseness of theseat 60 in manufacturing can be retained without being affected by the heat expansion and cool contraction. Thereby, the yield of the syringe can be increased and thesyringe seat 60 can suffer from a larger pull force over 3 kg. An outer wall of theseat 60 has anannular slot 64 which is corresponding to the annularfirst lip 52 at the inner wall of the front end of thesyringe 50. Moreover, the enclosingwall 63 has a plurality ofaxial slits 633 so that the enclosingwall 63 is reduceable. An inner wall of the enclosingwall 63 has aninner thread 634 for screwing thesyringe needle 80 to the connectingend 62. A rear end of theliquid flow channel 61 has a unidirectional bucklingchamber 65 and a first water-stop ring 66 is at a periphery of the unidirectional bucklingchamber 65 for preventing drainage of liquid from the contact surface of theseat 60 and thesyringe 50. - A push rod70 (referring to FIGS. 6, 7) has a front end. The front end has a
rod head 71. A plurality of connectingpoints 72 serve for connecting thepush rod 70 with therod head 71 so as to be formed as abreaking section 73 by which therod head 71 is broken after use. Therod head 71 has a second water-stop ring 74. A front end of therod head 71 has a tapered bucklinghead 75. An upper periphery of therod head 71 is installed with a plurality of unidirectional bucklingpieces 76. - By above mentioned structure, the
seat 60 androd head 71 of thepush rod 70 can enter into thesyringe 50. Then, thesecond lip 631 of theseat 60 can be pushed into thefirst lip 52 at the front end of thesyringe 50 so as to be buckled to thegroove 53 between thestop wall 51 and thefirst lip 52 so that theseat 60 is placed at a front end of thesyringe 50. Thesleeve 61 at a front end of theseat 60 protrudes from the front end of thesyringe 50. Thereby,needle 80 can be screwed into the syringe 50 (referring to FIG. 7). When thepush rod 70 is pushed to a foremost end, the bucklinghead 75 at the front end of therod head 71 can be pressed into the unidirectional bucklingchamber 65 at a rear end of the seat 60 (referring to FIG. 8). Next thepush rod 70 is pulled backwards and at the same time, theseat 60 is retracted so that theneedle 80 can be placed into the syringe 50 (referring to FIG. 9). Further, theneedle 80 is retracted to be stored in thesyringe 50. Then therod head 71 is broken to separate from the push rod 70 (referring to FIG. 10). Thereby, thesyringe 50 can be not reused. Thereby, the object of safety is achieved. - However the structure is similar to the prior art. The features of the present invention will be described herein.
- A plurality of
axial slits 67 are formed in the outer wall of the unidirectional bucklingchamber 65 of theseat 60. The inner wall of the unidirectional bucklingchamber 65 has a second unidirectional buckling lip 68 (referring to FIG. 7). The bucklinghead 75 at a front end of therod head 71 of thepush rod 70 is installed with a third unidirectional bucklinglip 77. The third unidirectional bucklinglip 77 is installed with a plurality ofslits 78 so that the third unidirectional bucklinglip 77 is elastic. Thereby, by theaxial slits 67 of the unidirectional bucklingchamber 65 and theslits 78 of the third unidirectional bucklinglip 77, when thepush rod 70 is pushed to a foremost end (referring to FIGS. 8, 11 and 12), the bucklinghead 75 at the front end of therod head 71 can be pushed into the unidirectional bucklingchamber 65 at the rear end of therod head 71 of thepush rod 70. - Further, the buckling
head 75 at the front end of therod head 71 of thepush rod 70 is extended with an axial strip 79 (referring to FIG. 6). When thepush rod 70 is pushed to a foremost end, theaxial strip 77 can be inserted into theliquid flow channel 61 of the seat 60 (referring to FIG. 8), the liquid in theliquid flow channel 61 can be pushed out so as to reduce the residue of the liquid to match the international standard. - The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
Claims (1)
1. A safety syringe comprising:
a syringe being a round cylinder, the round cylinder penetrated from a front end thereof to a rear end thereof; a stop wall being radially arranged to be at an inner wall of the syringe near the front end thereof; an annular first lip being formed at a rear end of the stop wall; an annular groove being formed between a rear side of the stop wall and the first lip; an annular first unidirectional buckling lip being installed at an inner wall of the rear side of the syringe;
a seat having a liquid flow channel which penetrates the front and rear ends of the syringe and at an axial center thereof; a front end of the liquid flow channel having a connecting end for connecting with a needle of the syringe; a periphery of the connecting end having an enclosing wall; an outer wall of the enclosing wall having a second lip annularly arranged around the enclosing wall; the second lip being corresponding to the groove at the front end syringe; an outer wall of the seat having an annular slot which is corresponding to the annular first lip at the inner wall of the front end of the syringe; a rear end of the liquid flow channel having a unidirectional buckling chamber and a first water-stop ring being at a periphery of the unidirectional buckling chamber for preventing drainage of liquid from the contact surface of the seat and the syringe;
a push rod having a front end; the front end having a rod head; a plurality of connecting points serving for connecting the push rod with the rod head so as to be formed as a breaking section for breaking the rod head after use; the rod head having a second water-stop ring; a front end of the rod head having a tapered buckling head; an upper periphery of the rod head being installed with a plurality of unidirectional buckling pieces; characterized in that:
a plurality of axial slits are formed in the outer wall of the unidirectional buckling chamber of the seat; an inner wall of the unidirectional buckling chamber has a second unidirectional buckling lip; the buckling head at a front end of the rod head of the push rod is installed with a third unidirectional buckling lip; the third unidirectional buckling lip is installed with a plurality of slits so that the third unidirectional buckling lip is elastic; thereby, by the axial slits of the unidirectional buckling chamber and the slits of the third unidirectional buckling lip, when the push rod is pushed to a foremost end, the buckling head at the front end of the rod head is pushed into the unidirectional buckling chamber at the rear end of the rod head of the push rod; and
the buckling head at the front end of the rod head of the push rod is extended with an axial strip; when the push rod is pushed to a foremost end, the axial strip is inserted into the liquid flow channel of the seat, the liquid in the liquid flow channel is pushed out so as to reduce the residue of the liquid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/437,607 US6827704B1 (en) | 2003-05-15 | 2003-05-15 | Safety syringe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/437,607 US6827704B1 (en) | 2003-05-15 | 2003-05-15 | Safety syringe |
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US20040230159A1 true US20040230159A1 (en) | 2004-11-18 |
US6827704B1 US6827704B1 (en) | 2004-12-07 |
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US10/437,607 Expired - Fee Related US6827704B1 (en) | 2003-05-15 | 2003-05-15 | Safety syringe |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1726321A2 (en) * | 2005-05-26 | 2006-11-29 | Chang-Tzu Chen | Safety hypodermic syringe |
WO2013140380A2 (en) * | 2012-03-23 | 2013-09-26 | Wolfe Tory Medical, Inc | Auto-disable syringe assembly |
WO2021139631A1 (en) * | 2020-01-09 | 2021-07-15 | 湖南省绿洲惠康发展有限公司 | Disposable stripping-type self-destructing syringe |
US20220203037A1 (en) * | 2020-12-29 | 2022-06-30 | Poonglim Pharmatech Inc. | Syringe with plunger reaction pressure reduction structure |
Families Citing this family (6)
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US20030220535A1 (en) * | 2002-04-04 | 2003-11-27 | Ferguson Patrick J. | Device for retaining material |
US20060106341A1 (en) * | 2004-09-16 | 2006-05-18 | Jin-Rong Lou | Safety syringe having retraction mechanism |
US20060178623A1 (en) * | 2005-01-26 | 2006-08-10 | Cheng-Chi Lo | Needle holder for safety syringe |
US20080058731A1 (en) * | 2006-09-05 | 2008-03-06 | Wei-Shui Wu | Safety Syringe Device |
KR200442835Y1 (en) * | 2008-05-06 | 2008-12-17 | 최숙녀 | Safety syringe |
KR102023143B1 (en) * | 2012-11-08 | 2019-09-19 | 술저 믹스팩 아게 | Cartridge for at least two flowable components |
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US5401246A (en) * | 1991-06-13 | 1995-03-28 | U.S. Medical Instruments, Inc. | Retractable syringe with a closed barrel |
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US20030212371A1 (en) * | 2002-05-10 | 2003-11-13 | Martin E. Smith | Disposable safety syringe |
US6761707B2 (en) * | 2002-02-08 | 2004-07-13 | Taiject Medical Device Co., Ltd. | Safety syringe having needle holder capable of fixing secured and easy to drawback |
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US5578015A (en) * | 1989-09-18 | 1996-11-26 | Robb Pascal Patent Limited | Safety syringe incorporating automatic needle holder release |
US5308329A (en) * | 1991-06-13 | 1994-05-03 | U.S. Medical Instruments, Inc. | Retractable syringe with a closed barrel |
US5401246A (en) * | 1991-06-13 | 1995-03-28 | U.S. Medical Instruments, Inc. | Retractable syringe with a closed barrel |
US6458105B1 (en) * | 2001-02-22 | 2002-10-01 | Maxxon, Inc. | Disposable syringe having a retractable needle |
US6761707B2 (en) * | 2002-02-08 | 2004-07-13 | Taiject Medical Device Co., Ltd. | Safety syringe having needle holder capable of fixing secured and easy to drawback |
US20030212371A1 (en) * | 2002-05-10 | 2003-11-13 | Martin E. Smith | Disposable safety syringe |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1726321A2 (en) * | 2005-05-26 | 2006-11-29 | Chang-Tzu Chen | Safety hypodermic syringe |
EP1726321A3 (en) * | 2005-05-26 | 2007-04-18 | Chang-Tzu Chen | Safety hypodermic syringe |
WO2013140380A2 (en) * | 2012-03-23 | 2013-09-26 | Wolfe Tory Medical, Inc | Auto-disable syringe assembly |
WO2013140380A3 (en) * | 2012-03-23 | 2014-02-20 | Wolfe Tory Medical, Inc | Auto-disable syringe assembly |
WO2021139631A1 (en) * | 2020-01-09 | 2021-07-15 | 湖南省绿洲惠康发展有限公司 | Disposable stripping-type self-destructing syringe |
US20220203037A1 (en) * | 2020-12-29 | 2022-06-30 | Poonglim Pharmatech Inc. | Syringe with plunger reaction pressure reduction structure |
JP2022104772A (en) * | 2020-12-29 | 2022-07-11 | プンリム ファーマテック インコーポレーテッド | Syringe having plunger repulsive pressure reduction structure |
US11752270B2 (en) * | 2020-12-29 | 2023-09-12 | Poonglim Pharmatech Inc. | Syringe with plunger reaction pressure reduction structure |
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