CN104043166A - Safety injector and needle connector fixing structure thereof - Google Patents
Safety injector and needle connector fixing structure thereof Download PDFInfo
- Publication number
- CN104043166A CN104043166A CN201410320320.5A CN201410320320A CN104043166A CN 104043166 A CN104043166 A CN 104043166A CN 201410320320 A CN201410320320 A CN 201410320320A CN 104043166 A CN104043166 A CN 104043166A
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- Prior art keywords
- hook
- syringe
- needle adapter
- needle
- retreating
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- 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
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- 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
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- 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
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- 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
The invention provides a safety injector and a needle connector fixing structure of the safety injector. The fixing structure comprises a blocking convex portion, a retaining hook and a hook hiding cavity. The blocking convex portion is arranged on the front end portion of a needle cylinder, is integrally formed with the needle cylinder, and protrudes inwards from the needle cylinder inner wall face in the radial direction, the hook hiding cavity is an opening cavity, wherein the hook hiding cavity is located in the wall of the needle cylinder and the opening of the hook hiding cavity is formed in a rubber-plug blocking shaft shoulder. The retaining hook comprises the side wall on the inner side of the hook hiding cavity in the radial direction and a support hook which protrudes inwards from the side wall in the radial direction, the retaining hook is elastic and can be unfolded through a needle connector and shifts to the position of the hook hiding cavity so as to allow the needle connector to be plugged into the internal space at the front end portion of the needle cylinder between the blocking convex portion and the retaining hook, the inner diameter of the blocking convex portion and the inner diameter of the support hook are smaller than the outer diameter of the peripheral wall face of the needle connector, so that the needle connector plugged into the internal space can be limited to be separated from the internal space. The safety injector has the advantages that the number of parts is less and the needle connector is firmly fixed.
Description
Technical field
The present invention relates to syringe, relate in particular to safety injector.
Background technology
Syringe is to use clinically maximum a kind of medical apparatus, uses at present the most disposable plastic syringe.Although disposable syringe has been controlled the problem of cross infection effectively, along with the mankind's progress, the theory of unidirectional protection is fallen behind.To having polluted the syringe needle of blood samples of patients in syringe use procedure, may cause the injury to user, the people that discarded syringe also may may touch it to this part in follow-up storage, transport, during Destruction causes unexpected injury.Therefore, the concept of multidirectional protection is arisen at the historic moment.Safety injector is exactly a kind of medical apparatus of multidirectional protection concept, and it not only protects patient to avoid cross infection, has also protected and has used its medical personnel and the follow-up personnel that likely touch it simultaneously, avoids the injury of polluted syringe needle.Therefore, safety injector is more and more subject to medical personnel's welcome, and market demand is also soaring year by year.But the safety injector coming out at present has a lot of complex structures, to use the safety injector of plug as example,, in the situation including syringe needle, part, more than more than 7 overwhelming majority that accounted for, does not cause batch production efficiency not high, and manufacturing cost is high, selling price does not just have captivation yet.Also there are many safety injectors can not use standard injection pin, when use, can not change syringe needle, also very inconvenient when clinical use.So just cause safety injector to promote not open, be difficult to substitute existing ordinary syringe.
The disclosed safety injector of patent documentation CN200520116767.7 has an outer shell fragment for the fixed structure of needle holder, is to stretch in level, in the time that needle adapter is subject to an axial force, belongs to shear structure, has rollover tendency.
The disclosed safety injector of patent documentation CN200520116767.7 is oblique overhanging cantilevered diagonal brace pawl for the fixed structure of needle holder, diagonal brace pawl is the shearing force that root is cut generation when stressed, syringe needle has the possibility backward retreating, do not consider in addition the sealing problem of front end, consider that sealing just must increase sealing ring.
The sealing that patent documentation CN201220024863 utilizes the interference fit between locking conehead, Connection Block and overcoat cylindrical shell to form is insecure, because plastics have creep feature, when installation time just there will be and leaks through 3 months and above time, solve and just need to increase sealing ring.
Summary of the invention
The object of the present invention is to provide a kind of safety injector and needle adapter fixed structure thereof, can ensure that needle adapter is fixedly secured.
The needle adapter fixed structure of safety injector provided by the invention, be characterized in being included in syringe leading section, establish with syringe all-in-one-piece gear protuberance, anti-retreating hook and hook chamber, Tibetan, gear protuberance is from syringe internal face radially to projecting inward, and hiding hook chamber is barrel and the atrium of opening on the plug backstop shaft shoulder that is positioned at syringe; Anti-retreating hook comprises hides the sidewall of hook chamber radially inner side and from radially inside outstanding hook of sidewall, anti-retreating hook has elasticity, can strut and be displaced to the position in hook chamber, Tibetan and then allow that needle adapter is tucked into the inner space of the syringe leading section between gear protuberance and anti-retreating hook by needle adapter, the internal diameter of gear protuberance, the internal diameter of hook are less than the external diameter of the periphery wall of needle adapter, depart from described inner space thereby can limit the needle adapter being tucked in described inner space.
Described needle adapter fixed structure, its further feature is, anti-retreating hook is multiple compositions that are arm shape part spaced apart also ringwise of described sidewall.
Safety injector provided by the invention, comprise syringe, core bar, plug and needle adapter, plug is built in syringe and is fixed on core bar, needle adapter is fixed on syringe leading section, in the leading section of syringe, provide the plug backstop shaft shoulder, be characterized in, syringe provides needle adapter fixed structure, this fixed structure be included in syringe leading section, establish with syringe all-in-one-piece gear protuberance, anti-retreating hook and hook chamber, Tibetan, gear protuberance is from syringe internal face radially to projecting inward, and hiding hook chamber is barrel and the atrium of opening on the plug backstop shaft shoulder that is positioned at syringe; Anti-retreating hook comprises hides the sidewall of hook chamber radially inner side and from radially inside outstanding hook of sidewall, anti-retreating hook has elasticity, can strut and be displaced to the position in hook chamber, Tibetan and then allow that needle adapter is tucked into the inner space of the syringe leading section between gear protuberance and anti-retreating hook by needle adapter, between the barrel internal face of the lateral surface of needle adapter and syringe leading section, sealed by hermetically-sealed construction, the internal diameter of gear protuberance, the internal diameter of hook are less than the external diameter of the periphery wall of needle adapter, depart from described inner space thereby can limit the needle adapter being tucked in described inner space; The front end of shifting the core bar at the end in syringe onto can be connected with needle adapter locking and anti-retreating hook can be strutted simultaneously and make anti-retreating hook be displaced to the position in hook chamber, Tibetan and then allow that needle adapter pulls out described inner space by core bar.
Described safety injector, its further feature is, the periphery wall of needle adapter protrudes the sealing ring with needle adapter all-in-one-piece annular, the barrel internal face tight fit of sealing ring and syringe leading section and form described hermetically-sealed construction.
Described safety injector, its further feature is that anti-retreating hook is made up of the multiple described sidewalls that are arm shape that distribute ringwise.
Described safety injector, its further feature is that needle adapter is that resilient macromolecular material is made.
Described safety injector, its further feature is that described macromolecular material is thermoplastic elastomer (TPE), natural rubber or synthetic rubber.
Described safety injector, its further feature is, described core bar front end has the post of filling in, needle adapter has the support ring coordinating with hook, the external diameter of filling in post is more than or equal to the external diameter of the periphery wall of support ring, and the front end of shifting the core bar at the end in syringe onto can be connected with needle adapter locking and this is filled in post and anti-retreating hook can be strutted and make anti-retreating hook be displaced to the position in hook chamber, Tibetan and then allow that needle adapter is pulled out from described inner space by core bar simultaneously.
Described safety injector, its further feature is, the barrel internal face radial dimension of the syringe leading section between the periphery wall of needle adapter and gear protuberance and anti-retreating hook equates.
Syringe barrel of the present invention is provided with and extends axially anti-retreating hook and hide hook chamber, when core bar is pushed into syringe front end completely, after core bar is meshed with needle adapter, core bar and needle adapter are closely locked as to one, when core bar is pulled back, filled in by core bar front end anti-retreating hook that post squeezes and be squeezed into and hide in hook chamber, abdicated the passage of pulling back.Therefore the present invention can ensure that needle adapter is fixedly secured and pulled out smoothly.Syringe according to the present invention has that part is few, the feature of needle adapter fixation, can only be formed by syringe, core bar, plug and four parts of needle adapter, in some occasions, also therefore can be referred to as four formula safety injectors according to syringe of the present invention.
Brief description of the drawings
The above and other features of the present invention, character and advantage are by by becoming more obvious below in conjunction with the description of drawings and Examples, wherein:
Fig. 1 is that the master of safety injector in one embodiment of the invention looks half sectional view.
Fig. 2 is that the master of syringe in Fig. 1 looks half sectional view.
Fig. 3 is the cutaway view along A-A line in Fig. 2.
Fig. 4 is the front view of core bar in Fig. 1.
Fig. 5 is the front view after needle adapter 90-degree rotation in Fig. 1.
Fig. 6 is the half sectional view of needle adapter in Fig. 5.
The needle adapter in Fig. 1 is installed to the schematic diagram in syringe leading section by Fig. 7.
Fig. 8 is that the master that the core bar of safety injector in Fig. 1 is shifted onto at the end looks half sectional view.
Fig. 9 is the front view that the state of syringe drawn in entry needle by the core bar of safety injector in Fig. 1.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the invention will be further described; set forth in the following description more details so that fully understand the present invention; but the present invention obviously can implement with the multiple alternate manner that is different from this description; those skilled in the art can do similar popularization, deduction according to practical situations without prejudice to intension of the present invention in the situation that, therefore should be with content constraints protection scope of the present invention of this specific embodiment.
Fig. 1 to Fig. 7 has shown the concrete structure of the present invention about the embodiment of safety injector and needle adapter fixed structure thereof; but it should be noted that; these and follow-up other accompanying drawing are all only as example; it is not to draw according to the condition of equal proportion, and should not be construed as limiting as the protection domain to actual requirement of the present invention using this.
As shown in Figure 1, safety injector comprises syringe 1, in syringe 1 slidably core bar 2, be arranged on the plug 3 on core bar 2, be arranged on the slidably needle adapter 4 of syringe 1 front end.
As shown in Figure 2, syringe 1 is cylindric, and its leading section 10 is inwardly indentation radially, therefore dimension of inner and outer diameters is less than other parts of syringe 1, form the shaft shoulder 15 in indentation place, the shaft shoulder 15 can be used for the top dead centre as plug 3 as shown in Figure 8, and restriction plug 3 can not move up again.Leading section 10 is single cylindric of inside and outside radial dimension, the front end of leading section 10 has radially to projecting inward gear protuberance 11, gear protuberance 11 can be along the continuous gear bulge loop of whole leading section 10 inner peripheral surfaces, also can be along whole leading section 10 inner peripheral surfaces multiple protuberances spaced apart, the internal diameter of gear bulge loop 11 is less than the external diameter of needle adapter 4, outside restriction needle adapter 4 can not reach.Leading section 10 provides and hides hook chamber 13 in abutting connection with the barrel of the shaft shoulder 15, hiding hook chamber 13 can be the cavity along the circumferential extension of whole barrel, and at the shaft shoulder, 15 places form opening, in Fig. 2, the cross sectional shape of hiding hook chamber 13 is triangle, can be other shapes such as rectangle or arch in other embodiments.Leading section 10 also has anti-retreating hook 12, anti-retreating hook 12 comprise the sidewall 121 of the radially inner side of hiding hook chamber 13 and certainly this sidewall 121 radially to projecting inward hook 123.Sidewall 121 can be along whole circumferentially continuous shape, also can be along whole circumferentially multiple suspension arms that are arm shape spaced apart, in embodiment as shown in the figure, sidewall 121 is that to be the multiple suspension arms that are uniformly distributed circumferentially be example, in the back, Reference numeral 121 is indicated a suspension arm unless otherwise noted.Hook 123 is radially protruded in end or rear end at each suspension arm 121, and in the drawings, suspension arm 121 vertically extends vertically, radially horizontal-extending of hook 123.In embodiment as shown in the figure, sealing ring 41 tight fits that the barrel internal face 14 of the leading section 10 between anti-retreating hook 12 and gear protuberance 11 protrudes as sealing surface and on the outer peripheral face of the needle adapter 4 of describing below, form hermetically-sealed construction.The bill 122 of hook 123 equates with the axial length of needle adapter 4 to the axial length between gear protuberance 11 or is smaller, almost good.And the barrel inner peripheral surface of leading section 10 and the outer peripheral face of needle adapter 4 are also similar on radial dimension, preferably equate, once needle adapter 4 is installed to the inner space of leading section 10 like this, radially degree of freedom and the axial freedom of needle adapter 4 have just been limited, add the tight fit interference fit in other words of upper sealing ring 41 and sealing surface 14, the two can not relatively rotate, and needle adapter 4 is just fixed on the inner space of leading section 10 firmly like this.
As shown in Figure 5 and Figure 6, interior all base plate 40A left ends of needle adapter 4 are locked joints of a standard compliant band female thread (dotted line in Fig. 6), can be connected with the entry needle of standard, in its outer peripheral sidewall, have the ringwise sealing ring 41 radially outward protruding, interior all base plate 40A right end portion of needle adapter 4 are annular support ring 42.The centre of interior all base plate 40A is formed with locking bar ring 43.As shown in Figure 9, the entry needle 9 of standard can be connected with needle adapter 4 routinely, correspondingly, and being connected and sealing, fixing etc. also can realizing with reference to corresponding standard of needle adapter 4 and entry needle 9.In addition, if needle adapter 4 and entry needle 9 also will be fine as one.Locking bar ring 43 joins with the claw 21 of mentioning below, is connected with the locking of core bar 2 to realize needle adapter 4, is connected also and can realizes with reference to corresponding industry standard or national standard with the locking of core bar 2 about needle adapter 4, is not limited to concrete structure as shown in the figure.Needle adapter 4 part that is one of the forming, in the time that needle adapter 4 adopts the macromolecular material of high-elastic characteristic to make, the hermetically-sealed construction that sealing ring 41 and sealing surface 14 form has more reliable, stable sealing property.
As shown in Figure 4, core bar 2 front ends are provided with claw 21, fill in post 22.As shown in Figure 1 and Figure 4, plug 3 is fixed on core bar 2, and plug 3 slides in syringe 1, acts on equally with piston, and core bar 2 correspondingly promote plug 3 the same as piston rod slides.Fill in the front side that post 22 is positioned at plug 3, and claw 21 is positioned at the front end face of core bar 2.
Simultaneously referring to Fig. 1, Fig. 2, Fig. 4, the anti-retreating hook 12 of syringe 1 is one group of elastic uncinus that has being suspended on syringe 1 inwall, can open and draw in, while not stressing, anti-retreating hook 12 is rounding state, now, the ring-type internal diameter C that the suspension arm 121 of one group of anti-retreating hook 12 forms is identical with the external diameter E of the support ring 42 of needle adapter 4, the ring-type inner diameter D that the bill 122 of one group of anti-retreating hook 12 forms is less than the external diameter E of the support ring 42 of needle adapter 4, thereby makes to be located in needle adapter 4 on the hook 123 of anti-retreating hook 12 and can not slip into the inner chamber of syringe 1.
Simultaneously referring to Fig. 1 to Fig. 7, the anti-retreating hook 12 that syringe 1 is provided with, in the time that needle adapter 4 is filled in assembling by hook 123 bottoms, and when the filling in post 22 and clamp-oned by hook 123 bottoms of core bar 2, anti-retreating hook 12 can open, and being displaced to the position in the hook chamber, Tibetan 13 of syringe 1, needle adapter 4 can successfully enter or go out from the front end of syringe 1.
Simultaneously referring to Fig. 1, Fig. 2, Fig. 3, Fig. 5, the anti-retreating hook 12 that syringe 1 is provided with, slip into completely at needle adapter 4 after the front end of syringe 1, now anti-retreating hook 12 can revert to rounding state, the support ring 42 of needle adapter 4 contacts with the hook 123 of anti-retreating hook 12 and is the state of mutually supporting, and needle adapter 4 is fixed on the front end of syringe 1.
Simultaneously referring to Fig. 1 to Fig. 5, the external diameter F of what core bar 2 was provided with fill in post 22 is more than or equal to the external diameter E of the support ring 42 of needle adapter 4, best for equaling the external diameter E of support ring 42 of needle adapter 4.Squeeze after anti-retreating hook 12 when filling in post 22, the diameter of the passage that anti-retreating hook 12 gets out of the way is just more than or equal to the external diameter E of the annular brace ring 42 of needle adapter 4, and so, needle adapter 4 can be returned in syringe 1 inner chamber by syringe 1 front end smoothly unobstructedly.
In preferred embodiment, needle adapter 4 is that the macromolecular material that has a high-elastic characteristic by thermoplastic elastomer (TPE), natural rubber or synthetic rubber etc. is made, and preferentially adopts thermoplastic elastomer (TPE).And the sealing ring 41 of needle adapter 4 is manufactured with needle adapter 4 body once-formings.So, need to, at the elastomeric O type circle of needle adapter 4 outside increase, not reduce by a part, also not need to adopt quadric injection mould, at one elastic sealing ring of needle adapter 4 injection moulding.
In use, syringe, in Fig. 1 state, is loaded onto entry needle (not shown in Fig. 1, can to understand with reference to Fig. 9) to safety injector as shown in the figure on needle adapter 4.The core bar 2 of pulling back, completes drawing liquid and aerofluxus, shifts core bar 2 onto the end and completes injection (as shown in Figure 8).Now, because the post 22 of filling in of core bar 2 squeezes the anti-retreating hook of syringe 1 12, the passage getting out of the way can make needle adapter pass through smoothly.Meanwhile, after the claw 21 of core bar 2 front ends has also been meshed with the locking bar ring 43 of needle adapter 4, core bar 2 and needle adapter 4 have closely been locked as one.Back pull core bar 2, needle adapter 4 is withdrawn in syringe 1 inner chamber together with entry needle mounted thereto 9.The core bar 2 that fractures, syringe is destroyed, just can not re-use, and the entry needle of moving syringe 1 inner chamber to can not stretch out again, and polluted syringe needle is protected completely.
The operation principle of safety injector is as shown in the figure:
Needle adapter 4 is pushed into behind anti-retreating hook 12 tops, front end is blocked by the gear bulge loop 11 of syringe 1 inner chamber, anti-retreating hook 12 below returns to rounding state, and the support ring 42 of needle adapter 4 is stuck on anti-retreating hook 12, and needle adapter 4 is just fixedly secured at syringe 1 front end and can not move forward and backward.The sealing ring 41 of needle adapter 4 outsides that sealing surface 14 and the elastomeric material of syringe 1 inner chamber setting made adopts interference fit or friction tight hermetically-sealed construction, has ensured the reliable sealing property of inner chamber of syringe 1, when syringe is used, can not leak.After injection, core bar 2 has been pushed syringe 1 to foremost, now the claw 21 of core bar 2 and the locking bar ring 43 of needle adapter 4 engage and core bar 2 and needle adapter 4 are locked as a whole, and hook chamber 13, Tibetan clamp-oned anti-retreating hook 12 by force by the post 22 of filling in of core bar 2, owing to filling in, the external diameter of post 22 is identical with the circumferential lateral surface external diameter of needle adapter 4, retreats passage and is opened.Back pull core bar 2, the needle adapter 4 that is locked in core bar 2 heads is pulled in the inner chamber of syringe 1 in the lump together with the entry needle 9 of installing above, has realized the syringe needle polluting and has been protected.
Needle adapter 4, at the related gear ring 11 of the fixed structure of syringe 1 and anti-retreating hook 12, is all directly to process on the body of syringe 1.And needle adapter 4 adopts elastomeric material, sealing ring 41 is also directly processed on the body of needle adapter 4.So, just greatly simplify the structure that syringe needle can haulback safety syringe, reduced number of parts, reduced manufacturing procedure and production cost.
If the comparative example using disclosed patent documentation CN200520116767.7 safety injector as previous embodiment, it is worth mentioning that, the hook 12 of the embodiment of the present invention be that footpath axially hangs and to vertically extending form, corresponding to hook, the oblique overhanging cantilevered diagonal brace pawl that patent documentation CN200520116767.7 records, suspension arm 121 is subject to hook 12 hooks of the embodiment of the present invention when stressed is tensile force, and aforementioned diagonal brace pawl is the shearing force that root is cut generation when stressed.In addition, hook 12 outsides of the embodiment of the present invention are provided with hides hook chamber 13, and they are the different piece of syringe leading section integral piece, do not hide pawl position in the barrel of the syringe of patent documentation CN200520116767.7, and the structure of the two is different.Further, embodiments of the invention can use standard needle by needle adapter 4, and patent documentation CN200520116767.7 can only use particular needle, and while needing needle exchange, just can only use manufacturer's special-purpose needle head, inconvenience.Also have, the syringe needle of patent documentation CN200520116767.7 is in the time of injection, owing to being that diagonal brace pawl is supporting syringe needle, syringe needle has the possibility backward retreating, particularly in the time being used for making up a prescription, when syringe needle is inserted to butyl rubber plug, and long-term injection is while causing the patient of buttocks muscles tissue fibering to accept to inject, axial force is larger, and syringe needle just retreats possibility, and the hook 12 of previous embodiment is axial tensile force due to what be subject to, there will not be the possibility that allows needle adapter to retreat.
If the comparative example using disclosed patent documentation CN200520116767.7 safety injector as previous embodiment, it is worth mentioning that, outer shell fragment of needle holder backing stop structure pit of patent documentation CN200520116767.7, it is in level, to stretch structure, and in the aforementioned embodiment, hook 12 is in fact hook, is one and extends axially.In the time that needle holder is subject to an axial force, patent documentation CN200520116767.7 is shear structure, has rollover tendency.And in an embodiment of the present invention, hook 12 is stretching structures, unless the cantilever of hook is broken, just nothing upset may.
In some embodiments of the invention, safety injector can only be made up of syringe 1, core bar 2, plug 3, needle adapter 4, syringe 1, core bar 2, plug 3, needle adapter 4 are all integrally moulded, without miscellaneous part, therefore can accomplish that quantity is few, cost is low.But should be noted that, due to the needle holder of safety injector, syringe, the concrete structure of the parts such as push rod and plug has restriction and the agreement of corresponding standard, some is because the syringe coming out has all formed fixed pattern, such as the anti-skid structure that prevents on syringe that needle holder from rotating, the core bar structure such as latching structure and the kelly groove at syringe rear portion is foremost exactly usage of trade way, although simply mentioned in these embodiment above, but it is not for limiting the present invention, any those skilled in the art without departing from the spirit and scope of the present invention, can make possible variation and amendment.Therefore, every content that does not depart from technical solution of the present invention, any amendment, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, within all falling into the protection domain that the claims in the present invention define.
Claims (9)
1. the needle adapter fixed structure of safety injector, this safety injector has syringe, syringe has the leading section that comprises the plug backstop shaft shoulder, it is characterized in that this fixed structure be included in syringe leading section, establish with syringe all-in-one-piece gear protuberance, anti-retreating hook and hook chamber, Tibetan, gear protuberance is from syringe internal face radially to projecting inward, and hiding hook chamber is barrel and the atrium of opening on the plug backstop shaft shoulder that is positioned at syringe; Anti-retreating hook comprises hides the sidewall of hook chamber radially inner side and from radially inside outstanding hook of sidewall, anti-retreating hook has elasticity, can strut and be displaced to the position in hook chamber, Tibetan and then allow that needle adapter is tucked into the inner space of the syringe leading section between gear protuberance and anti-retreating hook by needle adapter, the internal diameter of gear protuberance, the internal diameter of hook are less than the external diameter of the periphery wall of needle adapter, depart from described inner space thereby can limit the needle adapter being tucked in described inner space.
2. needle adapter fixed structure as claimed in claim 1, is characterized in that, anti-retreating hook is multiple compositions that are arm shape part spaced apart also ringwise of described sidewall.
3. a safety injector, comprise syringe, core bar, plug and needle adapter, plug is built in syringe and is fixed on core bar, needle adapter is fixed on syringe leading section, in the leading section of syringe, provide the plug backstop shaft shoulder, it is characterized in that, syringe provides needle adapter fixed structure, this fixed structure be included in syringe leading section, establish with syringe all-in-one-piece gear protuberance, anti-retreating hook and hook chamber, Tibetan, gear protuberance is from syringe internal face radially to projecting inward, and hiding hook chamber is barrel and the atrium of opening on the plug backstop shaft shoulder that is positioned at syringe; Anti-retreating hook comprises hides the sidewall of hook chamber radially inner side and from radially inside outstanding hook of sidewall, anti-retreating hook has elasticity, can strut and be displaced to the position in hook chamber, Tibetan and then allow that needle adapter is tucked into the inner space of the syringe leading section between gear protuberance and anti-retreating hook by needle adapter, between the barrel internal face of the lateral surface of needle adapter and syringe leading section, sealed by hermetically-sealed construction, the internal diameter of gear protuberance, the internal diameter of hook are less than the external diameter of the periphery wall of needle adapter, depart from described inner space thereby can limit the needle adapter being tucked in described inner space; The front end of shifting the core bar at the end in syringe onto can be connected with needle adapter locking and anti-retreating hook can be strutted simultaneously and make anti-retreating hook be displaced to the position in hook chamber, Tibetan and then allow that needle adapter pulls out described inner space by core bar.
4. safety injector as claimed in claim 3, is characterized in that, the periphery wall of needle adapter protrudes the sealing ring with needle adapter all-in-one-piece annular, the barrel internal face tight fit of sealing ring and syringe leading section and form described hermetically-sealed construction.
5. safety injector as claimed in claim 3, is characterized in that, anti-retreating hook is made up of the multiple described sidewalls that are arm shape that distribute ringwise.
6. safety injector as claimed in claim 4, is characterized in that, needle adapter is that resilient macromolecular material is made.
7. safety injector as claimed in claim 6, is characterized in that, described macromolecular material is thermoplastic elastomer (TPE), natural rubber or synthetic rubber.
8. safety injector as claimed in claim 3, it is characterized in that, described core bar front end has the post of filling in, needle adapter has the support ring coordinating with hook, the external diameter of filling in post is more than or equal to the external diameter of the periphery wall of support ring, and the front end of shifting the core bar at the end in syringe onto can be connected with needle adapter locking and this is filled in post and anti-retreating hook can be strutted and make anti-retreating hook be displaced to the position in hook chamber, Tibetan and then allow that needle adapter is pulled out from described inner space by core bar simultaneously.
9. safety injector as claimed in claim 3, is characterized in that, the barrel internal face radial dimension of the syringe leading section between the periphery wall of needle adapter and gear protuberance and anti-retreating hook equates.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410320320.5A CN104043166A (en) | 2014-07-07 | 2014-07-07 | Safety injector and needle connector fixing structure thereof |
| PCT/CN2014/091344 WO2016004717A1 (en) | 2014-07-07 | 2014-11-18 | Safe syringe and needle connector fixing structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410320320.5A CN104043166A (en) | 2014-07-07 | 2014-07-07 | Safety injector and needle connector fixing structure thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104043166A true CN104043166A (en) | 2014-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410320320.5A Pending CN104043166A (en) | 2014-07-07 | 2014-07-07 | Safety injector and needle connector fixing structure thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104043166A (en) |
| WO (1) | WO2016004717A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016004717A1 (en) * | 2014-07-07 | 2016-01-14 | 江西益康医疗器械集团有限公司 | Safe syringe and needle connector fixing structure thereof |
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| WO2016004717A1 (en) | 2016-01-14 |
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