CA2018200C - Safety hypodermic syringe - Google Patents
Safety hypodermic syringeInfo
- Publication number
- CA2018200C CA2018200C CA002018200A CA2018200A CA2018200C CA 2018200 C CA2018200 C CA 2018200C CA 002018200 A CA002018200 A CA 002018200A CA 2018200 A CA2018200 A CA 2018200A CA 2018200 C CA2018200 C CA 2018200C
- Authority
- CA
- Canada
- Prior art keywords
- holder
- plunger
- barrel
- clamping means
- clamping
- 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.)
- Expired - Fee Related
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- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston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
- A61M5/50—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 safety hypodermic syringe includes a hypodermic needle 30 fixedly connected to holding means 34 and constantly supported by an elastic element 38 for making axial movement, which holding means 34 is normally retained by a clamping means 20 at a ready position for injection.
When a hollow plunger 50 is pushed to the front limit, the hypodermic needle 30 becomes released from the constraint of the clamping means 20 and pushed by the elastic element 38 to drop and to further follow a covering means 56 to be discarded and squeezed into the inner chamber 52 of the plunger 50 so as to isolate from outside and to prevent from pricking accident or possible body fluid contact.
When a hollow plunger 50 is pushed to the front limit, the hypodermic needle 30 becomes released from the constraint of the clamping means 20 and pushed by the elastic element 38 to drop and to further follow a covering means 56 to be discarded and squeezed into the inner chamber 52 of the plunger 50 so as to isolate from outside and to prevent from pricking accident or possible body fluid contact.
Description
SAF~TY HY~DERMIC SYRING~
The pr-e.sel-lt irlventior-l is related to a kirld of hypoder~lic syringe and more particularly to a safety hypoder~lic syringe in which the hypoderlrli- needle will be autonlatically concealed therein after injection process is perfortned.
The hypoder~ic syringes currerltly in use are norlrlally disposable and made of plastic nlaterial, which are proposed for single shot application and shall be thrown away i~lrlediately after use so as to prevent fro~l body fluid contact.
The kind of conventional plastic syringe will have little change in structure before and after injectiorl.
Therefore, nlistake tends to happen and a disposed syringe ~ay be repeatedly used, or in order to save the cost, some çvil-doers rlay wash the used syringes for further use. As everybody knows, it is quite dangerous to repeatedly use a hypodermic syringe sir,ce infections suc}-l as AIDS and hepatitis may be infected through body fluid contact.
Another disadvantage of the conventional disposable hypf~der~lic syrirlge is the high frequen-,y of pricking af-ident to the nurse during operation. Ac-ording to the prior ar-t. the hyp-Jderrlic needle is normally protected by a rleedle ca~i~ which sl-lall tle reml3ved fron~ the hy~odellrli-needle wt-~en to su.~ up li~uid medicirle. After injeitiol-. the 5 r,eedle cap s~-lall be nlounted fJn the hypoder-nlic needle before the syrirlge is thrown away, 50 as to prevent fro~l pricking accident to the person who handle the refuse. However, because the boring bore of a needle cap is very small, the hypodermic is difficult to insert. Therefore, pricking a-cident may be happened during the operatior, to remount a needle cap onto a hypodermic needle, which pricking accident uill more frequently happen when a nur-se is under- emergen-y condition or high working pressure. According to the report from Morbidity and Mor-tality Weekly Report (Vol.36, No.2SJ issued on August ~1,1987 by the Department of Health of the U.S.~overnment,there was disclosed 708 persons having ever been injured by hypodermic needle among the total 883 investigated, i.e. 80% of the investigated having ever been pricked by hypodermic needle. Further ,according to the report from The Neu England 30urnal of Medicine (Vol.31~, it is a high risk matter to be in~ured by used hypodermic needle since infections such as AIDS and hepatitis may be infected through body fluid contact.
Further, ac-ordil-lg to the statistics on AIDS cases issued by the Departnlent of Health of the US Government, up to May 1988 there were 68,052 AIDS patients report,ed, ~D 2 0 ~ 8 ~ Q ~
among which 34,088 were died It is estimated that there will be as much as one and half million AIDS carrier patients in 1991. Therefore, it is very important to protect medical treatment and nursing people and medical refuse handling people against body fluid contact.
The main object of the present invention is to provide a safety hypodermic syringe in which the hypodermic needle will be automatically dropping into the inner chamber of the plunger to isolate from contact of people for easy lo handling to throw away, so as to prevent from body fluid contact.
Another object of the present invention is to provide a safety hypodermic syringe which will be changed in external appearance and the hypodermic needle will be completely dropped into the syringe when it is used, so as to help nursing people as well as patient simply identify if a syringe is a new one or has been used.
Therefore, a safety hypodermic syringe which achieves the said and other objects is including:
- a barrel for containing liquid medicine, having an inner surface, an outer surface, a rear opening and a front neck portion in reduced diameter;
- a clamping means fixedly set in said neck portion comprising resilient clamping portion constantly clamping inward;
- a holder integrally incorporated with a hypodermic needle, said holder being firmly retained by said clamping portion of said clamping means to let said hypodermic needle protrude beyond said barrel to become in a ready position for injection;
- an elastic element being to give an elastic force to said hypodermic needle connected holder so as to let said hypodermic needle connected holder move along axial way of said barrel; and - a hollow plunger having at least a part inserted through said rear opening and received in said barrel to slide ~o 20~8~U 0 therein, said hollow plunger comprising an inner chamber and a front end surface having thereon an axial hole communicating with said inner chamber, said axial hole being blocked up by a rubber plug, characterized in that when said plunger is pushed toward the front end of said barrel, said rubber plug is squeezed out of said axial hole by said holder, and said plunger having its front end press on said clamping means to let said clamping portion be squeezed to open so as to let said holder be released from the constraint or said clamping lo means.
Another object of the present invention is to propose a safety hypodermic syringe, comprising:
- a barrel for containing liquid having an inner surface, an outer surface, a rear opening and a front neck portion of reduced diameter;
- clamping means fixedly set in said neck portion comprising resilient clamping means constantly exerting a clamping force inwards;
- a holder connected to a hypodermic needle, said holder being firmly retained by said clamping means to allow said needle to protrude beyond said barrel in a position ready for injection;
- bias means exerting an axial displacement force on said holder in a rearward direction; and - a hollow plunger having at least a part thereof inserted through said rear opening and received in said barrel to slide therein, said hollow plunger comprising an inner chamber and a front end surface having a hole therethrough communicating with said inner chamber, said hole normally being blocked by a cover;
wherein, when said plunger is pushed towards said front neck portion of said barrel, the front end surface of said plunger presses against said clamping means to open the clamping means and release the holder from the constraint of said clamping means, enabling said bias means to force said hypodermic needle into the inner chamber of the plunger, characterised ~ 2 ~ ~ 8 2 0 ~
in that the cover comprises a displaceable plug and the holder is provided with protruding means extending axially towards the plunger, whereby substantially simultaneously with the plunger opening the clamping means the protruding means completely remove the plug from the hole to provide clear access to the inner chamber for the needle.
The drawings disclose an illustrative embodiment of the present invention which serves to exemplify the various advantages and objects hereof, and are as follows:
o Fig.l is a perspective exploded and partly sectional view of a safety hypodermic syringe embodying the present invention;
Fig.2 is a sectional assembly view of the said safety hypodermic syringe before injection;
Fig.3 is a sectional assembly view of the said safety hypodermic syringe when it is at a condition about to finish an injection ; and Fig.4 is a sectional view of the said safety hypodermic syringe after injection therein the hypodermic ~0 needle drops into the hollow plunger as 4a Referring tu Figs l and 2,a safety hypodermic syringe l~ compricies a barrel 12 for contairling liquid medi-ine~
whi-h barrel 12 incllldes ar~ irner ~l~rface~ar outer sur-face"an oper~ing 14 at the rear end and a neck portion l6 '~ in reduced diameter at the front end, which neck portion 16 is havir1g an inrler thread 17 ar1d co~lprisirlg a n axial hole l9 through which a hypodermic needle is passing An elastic clamping mearls 20 is conrlected to the barrel lZ at the inner side by means of screw-ioint, having integrally a lrJ cylindri-,al front half portion ~on1prising an outer thread 22 for connectior1 with the inner thread 17 hy means of screw joint, and a rear half portior1 composed of two L-shaped clan1ping elements 24 and ~6, ~hich elasti- clamping means 2q provides elastic resilience to clamping inward The clamping means 20 may be incorporated with the barre 112 to fornl a unity A hypodermi- needle 30 which is fixedly connected to a holding means 34 firmly retained by the two suspended and elasti- clamping elements 24 and 26 is having internally a passage through which liquid medi-ine is passing, and a pointed front end 32, which serves as a means to insert into patient's muscle for in3ection of liquid medicir1e from the ~arrel 12 through the passage 31 into phtient's body In order to reinforce the clamping effect of the clamping elen1ents 24 and 26 on the holding means 34, 2~ the clamping elen-lents 24 and 26 are havin~ flanges ~ made thereon to respectively engage with the recesses 36 which are n,ade on the holding means 34 Therefore, under nornlal col-lditiorl when the two clan-~ping elemerlts are nol pried to open by outside for(e the holding ~leans ~4 will be firmly reth,ined l~ the elacitic clampirlg n-ieanci 2~ b-~r meallC~ of the et-lgagemerlt of the flanges 28 witt-l the re(esseC 36 arld the property of constai~itly inward cla~lping force of the clampirlg means 20 itself, so as to let the hypodermic needle 30 protrude beyond the axial hole 1~ of the barrel 12 to beconle in a ready position for injectiorl The holding means 34 includes at least one protrusion 341 at the bottom surface 3'( An elastic element 38, like spring, is ~ounted on the hypodermic needle 30 and set between the holding means 34 and the outer threaded ~ylindrical front half portion 22, whi-h elasti- ele~lent 38 gives an elastic for-e to the holding ~eans 34 to slide along axial wa,y Under normal 1'l conditiorl, the elastic force that the elastic element 38 provides is conquered by the clamping force that the two clamping means Z4 and 26 provide Therefore, the elastic force will not be in effect before in2ection process is performed The safety syrirlge 10 is further comprising a hollow plunger 50 having a circling plun~er element 60 integrally made at the front by means of heat-sealing or any other suitable processing process the plunger asse~lbly which is formed of the hollow plunger 50 and the circling plunger element ~0 may beset into the barrel lZ f~om the opening 14 by ~leans of push force to slide therein along axial uay, to let the front end surface ~1 of the hollow plunger 50 and the circling plunger element 6~ co],lectively block up the openirlg 14 of the barrel 1~ Therefore, thr-ollgh the 3~ial ~rloiel~lerl~ of the hollow plunger 50 and the circ3irlg ~lurl~er elel~ent 6Q,liquid l~edicine may be sucked up il-~tO the barrel 1~ or t~ie liquid nledicine in the b3rrel 1 5 may be irljected t}-lL=Gugh 'he p3ssage 31 of tne hypoderirli-needle 3u Accor-ding to the preserlt invention, the hollow plunger 5-l is having an inner chamber 52, a front opening 54 on the front erld surfa-e 51 to ~ommunicate with the inner chamber 52, which front opening 54 is nor~lally sealed by a ~overing means 5~, and an en-losed handle portion 5~ for-holding by hand The hypodernlic needle 30 whi-h is protruding beyond the barrel 1~ ay he en-losed by a needle cap ~not shown'~ to protect against pri-king accident and prevent fron-contamination, even though pricking ac-ident does oc-ur~
corlta~ination is unlikely to happen Please refer to Fig ~ again When injection process is ~0 not perfor~led yet~ the needle connected holding means 34 is firmly retained by the clamping means ~0 to a ready position When in use, the plunger SO is pulled backward to produce a va-uu~ su-tion so as to suck up prepared liquid ~edicine into the barrel 1~ through the passage 31 ~5 Wherl to start in~ection, the pointed front end 3~' of the hypodermic needle 30 is piercing into patient s body Z0182~)0 Wherl the r,ypodermif needle 30 pier-es through patient s skirl, the reactive force un the hypollermi- needle 30 W1 lL be abs-Jrtled by the ~lamping fl-jrce that the cla~ipil-~g ll~eans ~0 applies on the holdi~ig ~lear,s 34 A~ ';001-l ~S the pLI~I-Iger 50 5 is plished ahead~ the liquid n-ledicine in the bc,lrel 12 is forced to inject through the passage 31 into patient s body With reference to Fig 3 ,when the plunger 50 is pushed touard the front limit, before the bottom surface ~9 of the two clampirlg elements ~4 and ~6 are in contact with the plunger 50, the protrusions 341 of the botto~ surface 35 of the holding means 34 will be firstly in contact with the covering means 56 uhich blocks up the front opening54 of the plurlger 50 Therefore, as soon as the plunger 5fJ is pushed to the front limit, the coverirlg means 56 is pushed to break away from the front opening 54, or is punched through With reference to Fig 4, when the plunger 5Q is pushed to the front li~it, the covering means 56 is squeezed out or punched through the front opening 54, and the front end surface 51 of the plunger 50 is pressing h-Jttom surface ~9 of the two suspended L-shaped clamping elements ~4 and 26 to pry the~ to open and to let the flanges ~ hreak auay from ~5 the respective engaged position with the recesses 36, so as to let the holding means 34 ~e releasefd fr-om the constraint of the clamping means ~0 Under this condition, only the 20182~)0 :tlu.c-,le of the F~atiellt (not shclw~ provides a r-etaining force to hold the hypoderlrlic needle 3fJ to let the hypoder~ic~
r~eed3e ~0 and the conl-lected h-3]ding nlesns 34 be teriporarily retaine.i in arl inje-,tion pOsiti(3l-l. After- in3e.-ti.3n proces.C, is c-J~,pleted~ t,he hypoder~ic rleedle 3U is pulled out of patierlt's body, the .sprirl& force fro~ tl~le ela.st,i- element 3~
will i~rltrlediately push the holdirlg means 34to ~arry the hypoder~ic needle 30 to ~ove backward along axial way.
Because the covering Irleans 56 has been punched through the 1~J front opening 54, the hypoderlrlic needle 30 will be pushed by the elastic ele~ent 3P into t,he inner ~hanlber .52 of the plunger 5Q to be-o~le totally re-eived therein.
A--ording to the present inventiorl~ the barrel 12 and the plunger- 5U are having wedge rings 11 and 59 ~atching with each other to stop against return stroke of the plunger when the plunger 50 is pushed to the front li~it, so as to prevent from breaking away of the plunger 50 fro~ the barrel 12 and to reduce spa-e consu~lption of the used ~0 syringe.
The barrel 12 is having volulrle scale 15 made on the outer wall surface for identification of the a~lount of li~uid wledi-ine filled in the barrel.
As disclosed in the acco~panying drawings fro~l Fig.2 through 4, when a nurse pulls the hypoderlrli- needle 30 and the syri1-lge 10 out of patierlt s body to complete inje-tion process, the holdin~ nleans 34 of the nypodermic needle 30 becomes in a freely dispssed poC3ition Wit}-lOUt havirlg any cla~lpirlg force applied theretu ~nd i.s i~lnlediately pushed by S the elastic element 3~ into the inner chalr~ber 52 of the plunge~- 50 to conceal therein. Therefore, after havirlg c-Jmpleted an injection~ the used syringe is well protected to isolate the hypodermic needle from contact of people so as to prevent from pricking accident or body fluid contact.
Having described my invention as related to the erlbodiment shown in the accomparlyirlg drawings, it is my intention that the invention be not limited by any of the details of description. unle.c;s otherwise specified, but rather be constructed broadly within its spirit and scope as set out in the appended ~laims.
lCI
The pr-e.sel-lt irlventior-l is related to a kirld of hypoder~lic syringe and more particularly to a safety hypoder~lic syringe in which the hypoderlrli- needle will be autonlatically concealed therein after injection process is perfortned.
The hypoder~ic syringes currerltly in use are norlrlally disposable and made of plastic nlaterial, which are proposed for single shot application and shall be thrown away i~lrlediately after use so as to prevent fro~l body fluid contact.
The kind of conventional plastic syringe will have little change in structure before and after injectiorl.
Therefore, nlistake tends to happen and a disposed syringe ~ay be repeatedly used, or in order to save the cost, some çvil-doers rlay wash the used syringes for further use. As everybody knows, it is quite dangerous to repeatedly use a hypodermic syringe sir,ce infections suc}-l as AIDS and hepatitis may be infected through body fluid contact.
Another disadvantage of the conventional disposable hypf~der~lic syrirlge is the high frequen-,y of pricking af-ident to the nurse during operation. Ac-ording to the prior ar-t. the hyp-Jderrlic needle is normally protected by a rleedle ca~i~ which sl-lall tle reml3ved fron~ the hy~odellrli-needle wt-~en to su.~ up li~uid medicirle. After injeitiol-. the 5 r,eedle cap s~-lall be nlounted fJn the hypoder-nlic needle before the syrirlge is thrown away, 50 as to prevent fro~l pricking accident to the person who handle the refuse. However, because the boring bore of a needle cap is very small, the hypodermic is difficult to insert. Therefore, pricking a-cident may be happened during the operatior, to remount a needle cap onto a hypodermic needle, which pricking accident uill more frequently happen when a nur-se is under- emergen-y condition or high working pressure. According to the report from Morbidity and Mor-tality Weekly Report (Vol.36, No.2SJ issued on August ~1,1987 by the Department of Health of the U.S.~overnment,there was disclosed 708 persons having ever been injured by hypodermic needle among the total 883 investigated, i.e. 80% of the investigated having ever been pricked by hypodermic needle. Further ,according to the report from The Neu England 30urnal of Medicine (Vol.31~, it is a high risk matter to be in~ured by used hypodermic needle since infections such as AIDS and hepatitis may be infected through body fluid contact.
Further, ac-ordil-lg to the statistics on AIDS cases issued by the Departnlent of Health of the US Government, up to May 1988 there were 68,052 AIDS patients report,ed, ~D 2 0 ~ 8 ~ Q ~
among which 34,088 were died It is estimated that there will be as much as one and half million AIDS carrier patients in 1991. Therefore, it is very important to protect medical treatment and nursing people and medical refuse handling people against body fluid contact.
The main object of the present invention is to provide a safety hypodermic syringe in which the hypodermic needle will be automatically dropping into the inner chamber of the plunger to isolate from contact of people for easy lo handling to throw away, so as to prevent from body fluid contact.
Another object of the present invention is to provide a safety hypodermic syringe which will be changed in external appearance and the hypodermic needle will be completely dropped into the syringe when it is used, so as to help nursing people as well as patient simply identify if a syringe is a new one or has been used.
Therefore, a safety hypodermic syringe which achieves the said and other objects is including:
- a barrel for containing liquid medicine, having an inner surface, an outer surface, a rear opening and a front neck portion in reduced diameter;
- a clamping means fixedly set in said neck portion comprising resilient clamping portion constantly clamping inward;
- a holder integrally incorporated with a hypodermic needle, said holder being firmly retained by said clamping portion of said clamping means to let said hypodermic needle protrude beyond said barrel to become in a ready position for injection;
- an elastic element being to give an elastic force to said hypodermic needle connected holder so as to let said hypodermic needle connected holder move along axial way of said barrel; and - a hollow plunger having at least a part inserted through said rear opening and received in said barrel to slide ~o 20~8~U 0 therein, said hollow plunger comprising an inner chamber and a front end surface having thereon an axial hole communicating with said inner chamber, said axial hole being blocked up by a rubber plug, characterized in that when said plunger is pushed toward the front end of said barrel, said rubber plug is squeezed out of said axial hole by said holder, and said plunger having its front end press on said clamping means to let said clamping portion be squeezed to open so as to let said holder be released from the constraint or said clamping lo means.
Another object of the present invention is to propose a safety hypodermic syringe, comprising:
- a barrel for containing liquid having an inner surface, an outer surface, a rear opening and a front neck portion of reduced diameter;
- clamping means fixedly set in said neck portion comprising resilient clamping means constantly exerting a clamping force inwards;
- a holder connected to a hypodermic needle, said holder being firmly retained by said clamping means to allow said needle to protrude beyond said barrel in a position ready for injection;
- bias means exerting an axial displacement force on said holder in a rearward direction; and - a hollow plunger having at least a part thereof inserted through said rear opening and received in said barrel to slide therein, said hollow plunger comprising an inner chamber and a front end surface having a hole therethrough communicating with said inner chamber, said hole normally being blocked by a cover;
wherein, when said plunger is pushed towards said front neck portion of said barrel, the front end surface of said plunger presses against said clamping means to open the clamping means and release the holder from the constraint of said clamping means, enabling said bias means to force said hypodermic needle into the inner chamber of the plunger, characterised ~ 2 ~ ~ 8 2 0 ~
in that the cover comprises a displaceable plug and the holder is provided with protruding means extending axially towards the plunger, whereby substantially simultaneously with the plunger opening the clamping means the protruding means completely remove the plug from the hole to provide clear access to the inner chamber for the needle.
The drawings disclose an illustrative embodiment of the present invention which serves to exemplify the various advantages and objects hereof, and are as follows:
o Fig.l is a perspective exploded and partly sectional view of a safety hypodermic syringe embodying the present invention;
Fig.2 is a sectional assembly view of the said safety hypodermic syringe before injection;
Fig.3 is a sectional assembly view of the said safety hypodermic syringe when it is at a condition about to finish an injection ; and Fig.4 is a sectional view of the said safety hypodermic syringe after injection therein the hypodermic ~0 needle drops into the hollow plunger as 4a Referring tu Figs l and 2,a safety hypodermic syringe l~ compricies a barrel 12 for contairling liquid medi-ine~
whi-h barrel 12 incllldes ar~ irner ~l~rface~ar outer sur-face"an oper~ing 14 at the rear end and a neck portion l6 '~ in reduced diameter at the front end, which neck portion 16 is havir1g an inrler thread 17 ar1d co~lprisirlg a n axial hole l9 through which a hypodermic needle is passing An elastic clamping mearls 20 is conrlected to the barrel lZ at the inner side by means of screw-ioint, having integrally a lrJ cylindri-,al front half portion ~on1prising an outer thread 22 for connectior1 with the inner thread 17 hy means of screw joint, and a rear half portior1 composed of two L-shaped clan1ping elements 24 and ~6, ~hich elasti- clamping means 2q provides elastic resilience to clamping inward The clamping means 20 may be incorporated with the barre 112 to fornl a unity A hypodermi- needle 30 which is fixedly connected to a holding means 34 firmly retained by the two suspended and elasti- clamping elements 24 and 26 is having internally a passage through which liquid medi-ine is passing, and a pointed front end 32, which serves as a means to insert into patient's muscle for in3ection of liquid medicir1e from the ~arrel 12 through the passage 31 into phtient's body In order to reinforce the clamping effect of the clamping elen1ents 24 and 26 on the holding means 34, 2~ the clamping elen-lents 24 and 26 are havin~ flanges ~ made thereon to respectively engage with the recesses 36 which are n,ade on the holding means 34 Therefore, under nornlal col-lditiorl when the two clan-~ping elemerlts are nol pried to open by outside for(e the holding ~leans ~4 will be firmly reth,ined l~ the elacitic clampirlg n-ieanci 2~ b-~r meallC~ of the et-lgagemerlt of the flanges 28 witt-l the re(esseC 36 arld the property of constai~itly inward cla~lping force of the clampirlg means 20 itself, so as to let the hypodermic needle 30 protrude beyond the axial hole 1~ of the barrel 12 to beconle in a ready position for injectiorl The holding means 34 includes at least one protrusion 341 at the bottom surface 3'( An elastic element 38, like spring, is ~ounted on the hypodermic needle 30 and set between the holding means 34 and the outer threaded ~ylindrical front half portion 22, whi-h elasti- ele~lent 38 gives an elastic for-e to the holding ~eans 34 to slide along axial wa,y Under normal 1'l conditiorl, the elastic force that the elastic element 38 provides is conquered by the clamping force that the two clamping means Z4 and 26 provide Therefore, the elastic force will not be in effect before in2ection process is performed The safety syrirlge 10 is further comprising a hollow plunger 50 having a circling plun~er element 60 integrally made at the front by means of heat-sealing or any other suitable processing process the plunger asse~lbly which is formed of the hollow plunger 50 and the circling plunger element ~0 may beset into the barrel lZ f~om the opening 14 by ~leans of push force to slide therein along axial uay, to let the front end surface ~1 of the hollow plunger 50 and the circling plunger element 6~ co],lectively block up the openirlg 14 of the barrel 1~ Therefore, thr-ollgh the 3~ial ~rloiel~lerl~ of the hollow plunger 50 and the circ3irlg ~lurl~er elel~ent 6Q,liquid l~edicine may be sucked up il-~tO the barrel 1~ or t~ie liquid nledicine in the b3rrel 1 5 may be irljected t}-lL=Gugh 'he p3ssage 31 of tne hypoderirli-needle 3u Accor-ding to the preserlt invention, the hollow plunger 5-l is having an inner chamber 52, a front opening 54 on the front erld surfa-e 51 to ~ommunicate with the inner chamber 52, which front opening 54 is nor~lally sealed by a ~overing means 5~, and an en-losed handle portion 5~ for-holding by hand The hypodernlic needle 30 whi-h is protruding beyond the barrel 1~ ay he en-losed by a needle cap ~not shown'~ to protect against pri-king accident and prevent fron-contamination, even though pricking ac-ident does oc-ur~
corlta~ination is unlikely to happen Please refer to Fig ~ again When injection process is ~0 not perfor~led yet~ the needle connected holding means 34 is firmly retained by the clamping means ~0 to a ready position When in use, the plunger SO is pulled backward to produce a va-uu~ su-tion so as to suck up prepared liquid ~edicine into the barrel 1~ through the passage 31 ~5 Wherl to start in~ection, the pointed front end 3~' of the hypodermic needle 30 is piercing into patient s body Z0182~)0 Wherl the r,ypodermif needle 30 pier-es through patient s skirl, the reactive force un the hypollermi- needle 30 W1 lL be abs-Jrtled by the ~lamping fl-jrce that the cla~ipil-~g ll~eans ~0 applies on the holdi~ig ~lear,s 34 A~ ';001-l ~S the pLI~I-Iger 50 5 is plished ahead~ the liquid n-ledicine in the bc,lrel 12 is forced to inject through the passage 31 into patient s body With reference to Fig 3 ,when the plunger 50 is pushed touard the front limit, before the bottom surface ~9 of the two clampirlg elements ~4 and ~6 are in contact with the plunger 50, the protrusions 341 of the botto~ surface 35 of the holding means 34 will be firstly in contact with the covering means 56 uhich blocks up the front opening54 of the plurlger 50 Therefore, as soon as the plunger 5fJ is pushed to the front limit, the coverirlg means 56 is pushed to break away from the front opening 54, or is punched through With reference to Fig 4, when the plunger 5Q is pushed to the front li~it, the covering means 56 is squeezed out or punched through the front opening 54, and the front end surface 51 of the plunger 50 is pressing h-Jttom surface ~9 of the two suspended L-shaped clamping elements ~4 and 26 to pry the~ to open and to let the flanges ~ hreak auay from ~5 the respective engaged position with the recesses 36, so as to let the holding means 34 ~e releasefd fr-om the constraint of the clamping means ~0 Under this condition, only the 20182~)0 :tlu.c-,le of the F~atiellt (not shclw~ provides a r-etaining force to hold the hypoderlrlic needle 3fJ to let the hypoder~ic~
r~eed3e ~0 and the conl-lected h-3]ding nlesns 34 be teriporarily retaine.i in arl inje-,tion pOsiti(3l-l. After- in3e.-ti.3n proces.C, is c-J~,pleted~ t,he hypoder~ic rleedle 3U is pulled out of patierlt's body, the .sprirl& force fro~ tl~le ela.st,i- element 3~
will i~rltrlediately push the holdirlg means 34to ~arry the hypoder~ic needle 30 to ~ove backward along axial way.
Because the covering Irleans 56 has been punched through the 1~J front opening 54, the hypoderlrlic needle 30 will be pushed by the elastic ele~ent 3P into t,he inner ~hanlber .52 of the plunger 5Q to be-o~le totally re-eived therein.
A--ording to the present inventiorl~ the barrel 12 and the plunger- 5U are having wedge rings 11 and 59 ~atching with each other to stop against return stroke of the plunger when the plunger 50 is pushed to the front li~it, so as to prevent from breaking away of the plunger 50 fro~ the barrel 12 and to reduce spa-e consu~lption of the used ~0 syringe.
The barrel 12 is having volulrle scale 15 made on the outer wall surface for identification of the a~lount of li~uid wledi-ine filled in the barrel.
As disclosed in the acco~panying drawings fro~l Fig.2 through 4, when a nurse pulls the hypoderlrli- needle 30 and the syri1-lge 10 out of patierlt s body to complete inje-tion process, the holdin~ nleans 34 of the nypodermic needle 30 becomes in a freely dispssed poC3ition Wit}-lOUt havirlg any cla~lpirlg force applied theretu ~nd i.s i~lnlediately pushed by S the elastic element 3~ into the inner chalr~ber 52 of the plunge~- 50 to conceal therein. Therefore, after havirlg c-Jmpleted an injection~ the used syringe is well protected to isolate the hypodermic needle from contact of people so as to prevent from pricking accident or body fluid contact.
Having described my invention as related to the erlbodiment shown in the accomparlyirlg drawings, it is my intention that the invention be not limited by any of the details of description. unle.c;s otherwise specified, but rather be constructed broadly within its spirit and scope as set out in the appended ~laims.
lCI
Claims (7)
1. A safety hypodermic syringe, comprising:
- a barrel for containing liquid medicine, having an inner surface, an outer surface, a rear opening and a front neck portion in reduced diameter;
- a clamping means fixedly set in said neck portion comprising resilient clamping portion constantly clamping inward;
- a holder integrally incorporated with a hypodermic needle, said holder being firmly retained by said clamping portion of said clamping means to let said-hypodermic needle protrude beyond said barrel to become in a ready position for injection;
- an elastic element being to give an elastic force to said hypodermic needle connected holder so as to let said hypodermic needle connected holder move along axial way of said barrel; and - a hollow plunger having at least a part inserted through said rear opening and received in said barrel to slide therein, said hollow plunger comprising an inner chamber and a front end surface having thereon an axial hole communicating with said inner chamber, said axial hole being blocked up by a rubber plug, characterized in that when said plunger is pushed toward the front end of said barrel, said rubber plug is squeezed out of said axial hole by said holder, and said plunger having its front end press on said clamping means to let said clamping portion be squeezed to open so as to let said holder be released from the constraint of said clamping means.
- a barrel for containing liquid medicine, having an inner surface, an outer surface, a rear opening and a front neck portion in reduced diameter;
- a clamping means fixedly set in said neck portion comprising resilient clamping portion constantly clamping inward;
- a holder integrally incorporated with a hypodermic needle, said holder being firmly retained by said clamping portion of said clamping means to let said-hypodermic needle protrude beyond said barrel to become in a ready position for injection;
- an elastic element being to give an elastic force to said hypodermic needle connected holder so as to let said hypodermic needle connected holder move along axial way of said barrel; and - a hollow plunger having at least a part inserted through said rear opening and received in said barrel to slide therein, said hollow plunger comprising an inner chamber and a front end surface having thereon an axial hole communicating with said inner chamber, said axial hole being blocked up by a rubber plug, characterized in that when said plunger is pushed toward the front end of said barrel, said rubber plug is squeezed out of said axial hole by said holder, and said plunger having its front end press on said clamping means to let said clamping portion be squeezed to open so as to let said holder be released from the constraint of said clamping means.
2. A safety hypodermic syringe comprising:
- a barrel for containing liquid having an inner surface, an outer surface, a rear opening and a front neck portion of reduced diameter;
- clamping means fixedly set in said neck portion comprising resilient clamping means constantly exerting a clamping force inwards;
- a holder connected to a hypodermic needle, said holder being firmly retained by said clamping means to allow said needle to protrude beyond said barrel in a position ready for injection;
- bias means exerting an axial displacement force on said holder in a rearward direction; and - a hollow plunger having at least a part thereof inserted through said rear opening and received in said barrel to slide therein, said hollow plunger comprising an inner chamber and a front end surface having a hole therethrough communicating with said inner chamber, said hole normally being blocked by a cover;
wherein, when said plunger is pushed towards said front neck portion of said barrel, the front end surface of said plunger presses against said clamping means to open the clamping means and release the holder from the constraint of said clamping means, enabling said bias means to force said hypodermic needle into the inner chamber of the plunger, characterised in that the cover comprises a displaceable plug and the holder is provided with protruding means extending axially towards the pluger, whereby substantially simultaneously with the plunger opening the clamping means the protruding means completely remove the plug from the hole to provide clear access to the inner chamber for the needle.
- a barrel for containing liquid having an inner surface, an outer surface, a rear opening and a front neck portion of reduced diameter;
- clamping means fixedly set in said neck portion comprising resilient clamping means constantly exerting a clamping force inwards;
- a holder connected to a hypodermic needle, said holder being firmly retained by said clamping means to allow said needle to protrude beyond said barrel in a position ready for injection;
- bias means exerting an axial displacement force on said holder in a rearward direction; and - a hollow plunger having at least a part thereof inserted through said rear opening and received in said barrel to slide therein, said hollow plunger comprising an inner chamber and a front end surface having a hole therethrough communicating with said inner chamber, said hole normally being blocked by a cover;
wherein, when said plunger is pushed towards said front neck portion of said barrel, the front end surface of said plunger presses against said clamping means to open the clamping means and release the holder from the constraint of said clamping means, enabling said bias means to force said hypodermic needle into the inner chamber of the plunger, characterised in that the cover comprises a displaceable plug and the holder is provided with protruding means extending axially towards the pluger, whereby substantially simultaneously with the plunger opening the clamping means the protruding means completely remove the plug from the hole to provide clear access to the inner chamber for the needle.
3. A safety hypodermic syringe according to claim 1 or 2, wherein said plunger has a check member to stop against return stroke when said plunger is pushed to be in contact with said holder.
4. A safety hypodermic syringe according to claim 3, wherein said check member includes two wedge rings respectively made on the inner surface of said barrel and the outer surface of said plunger to engage with each other.
5. A safety hypodermic syringe according to claim 1, 2, 3 or 4, wherein said clamping means includes retainer flanges, and said holder has recesses made thereon to respectively engage with said retainer flanges when said holder is retained by said clamping means.
6. A safety hypodermic syringe according to claim 1, wherein said holder includes at least one protrusion pointing downward for squeezing out said rubber plug of said axial hole.
7. A safety hypodermic syringe according to claim 1, wherein said clamping means incorporated with said barrel for containing liquid medicine to form a unity.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/393,390 | 1989-08-14 | ||
| US07/393,390 US5019044A (en) | 1989-08-14 | 1989-08-14 | Safety hypodermic syringe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2018200A1 CA2018200A1 (en) | 1991-02-14 |
| CA2018200C true CA2018200C (en) | 1997-10-14 |
Family
ID=23554501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002018200A Expired - Fee Related CA2018200C (en) | 1989-08-14 | 1990-06-04 | Safety hypodermic syringe |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5019044A (en) |
| EP (1) | EP0413414B1 (en) |
| CN (1) | CN1049457A (en) |
| AT (1) | ATE104558T1 (en) |
| AU (1) | AU613836B2 (en) |
| CA (1) | CA2018200C (en) |
| DE (1) | DE69008273T2 (en) |
| DK (1) | DK0413414T3 (en) |
| ES (1) | ES2051472T3 (en) |
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| CN101951980A (en) * | 2007-03-21 | 2011-01-19 | 米德兰医疗设备控股有限公司 | Safety medical syringe with retractable needle and including a plunger that is received within a barrel |
| US20100010450A1 (en) * | 2008-06-13 | 2010-01-14 | Vincent Runfola | Retractable syringe with improved stem ring and needle interchangeability |
| US8167820B2 (en) * | 2009-03-20 | 2012-05-01 | Mahurkar Sakharam D | Retractable needle-safety blood sampling device |
| US20110125130A1 (en) * | 2009-04-08 | 2011-05-26 | Stat Medical Devices, Inc. | Retractable needle assembly and syringe utilizing the same |
| US8986249B2 (en) * | 2009-04-08 | 2015-03-24 | Stat Medical Devices, Inc. | Retractable needle assembly and syringe utilizing the same |
| US9480799B2 (en) * | 2009-04-08 | 2016-11-01 | Stat Medical Devices, Inc. | Retractable needle assembly utilizing a standard interface and syringe utilizing the same |
| US7918821B2 (en) | 2009-05-05 | 2011-04-05 | Mahurkar Sakharam D | Universal safety syringe |
| DE102014006323A1 (en) * | 2014-04-30 | 2015-11-05 | Gerresheimer Regensburg Gmbh | Pre-filled syringe with reuse protection |
| RU195182U1 (en) * | 2019-11-14 | 2020-01-17 | Общество с ограниченной ответственностью "Специальная и медицинская техника" (ООО "Спецмедтехника") | Device for preparing for intraosseous infusion |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2197792A (en) * | 1986-11-26 | 1988-06-02 | Power Richard Kiteley | Disposable syringes |
| US4804370A (en) * | 1987-03-13 | 1989-02-14 | Habley Medical Technology Corporation | Disease control syringe having a retractable needle |
| DK156414C (en) * | 1987-07-13 | 1990-01-22 | Gerda Ingrid Maria Gaarde | INJECTIVE SPRAY WITH CANNEL THAT CAN BE WITHDRAWED AND FIXED IN THE SPRAY |
| US4850968A (en) * | 1987-07-27 | 1989-07-25 | Ar.Ma.S.R.L. | Self-blocking hypodermic syringe for once-only use, comprising a needle protection cap |
| US4838869A (en) * | 1987-08-29 | 1989-06-13 | Allard Edward F | Retractable needle syringe |
| US4781684A (en) * | 1987-09-03 | 1988-11-01 | Trenner Lewis E | Single use disposable hypodermic syringe |
| CH669910A5 (en) * | 1988-07-05 | 1989-04-28 | Michel Elie Ritzi | Syringe with two series of stops on piston - engageable by rotation with slot in cover to allow motion in one direction only |
-
1989
- 1989-08-14 US US07/393,390 patent/US5019044A/en not_active Expired - Fee Related
-
1990
- 1990-06-04 CA CA002018200A patent/CA2018200C/en not_active Expired - Fee Related
- 1990-06-07 DK DK90306191.9T patent/DK0413414T3/en active
- 1990-06-07 DE DE69008273T patent/DE69008273T2/en not_active Expired - Fee Related
- 1990-06-07 ES ES90306191T patent/ES2051472T3/en not_active Expired - Lifetime
- 1990-06-07 EP EP90306191A patent/EP0413414B1/en not_active Expired - Lifetime
- 1990-06-07 AT AT9090306191T patent/ATE104558T1/en not_active IP Right Cessation
- 1990-06-09 CN CN90104359A patent/CN1049457A/en active Pending
- 1990-06-13 AU AU57097/90A patent/AU613836B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| AU5709790A (en) | 1991-02-14 |
| CA2018200A1 (en) | 1991-02-14 |
| EP0413414B1 (en) | 1994-04-20 |
| EP0413414A1 (en) | 1991-02-20 |
| US5019044A (en) | 1991-05-28 |
| AU613836B2 (en) | 1991-08-08 |
| DE69008273T2 (en) | 1994-09-29 |
| CN1049457A (en) | 1991-02-27 |
| DK0413414T3 (en) | 1994-07-18 |
| ES2051472T3 (en) | 1994-06-16 |
| DE69008273D1 (en) | 1994-05-26 |
| ATE104558T1 (en) | 1994-05-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |