CN107050576A

CN107050576A - Safety injector

Info

Publication number: CN107050576A
Application number: CN201710345633.XA
Authority: CN
Inventors: 张奕奕; 张祖仁; 徐维华
Original assignee: Shanghai Best Medical Instrument Co Ltd
Current assignee: Shanghai Best Medical Instrument Co Ltd
Priority date: 2017-05-16
Filing date: 2017-05-16
Publication date: 2017-08-18
Anticipated expiration: 2037-05-16
Also published as: WO2018209792A1; CN107050576B

Abstract

A kind of safety injector, realize after safety injector use, the use requirement aspirated and injected for single, expected disposable process is once completion, automatic start prevents from reusing function, the overcoat and core bar of safety injector are locked together, the taper lip for then pinching the flat injection needle away from syringe needle is removed the injection needle carried disease germs and is put into collecting box；The use requirement that can be repeatedly aspirated for core bar, expected disposable process is once completion, the taper lip for pinching the flat injection needle away from syringe needle removes injection needle, both the injection needle carried disease germs can be put into collecting box, the injection needle carried disease germs can also be taken in the utensil intracavitary of core bar, then optionally manually starting is prevented from reusing function, and overcoat and core bar are locked together or do not locked together；The purpose of syringe needle will not be touched by reaching in operating process, so as to both the injection needle carried disease germs can be avoided to cause serious injury human body, can avoid being reused again.

Description

Safety injector

Technical field

The present invention relates to various safety injectors, various safety-type disposable aseptic injections are related specifically to Device, is also related specifically to the safety-type disposable sterilized syringe of various pre-filled medicinal liquids.

Background technology

Various injector for medical purpose can be used for injecting and export various liquid, can be used for aspirating various liquid, may be used also For being mixed various liquid or mixing various liquid with powder, pumping liquid or mixing in container can be also used for Various liquid or mixing liquid and powder, can be also used for rinsing or cleaning of objects.Plugged on the conehead of various injector for medical purpose After injection needle, various medicaments can be expelled in human body or the subcutaneous of animal, muscle, blood vessel or other histoorgans, also Various liquid can be aspirated out of human body or the histoorgan of animal.Plugged on the conehead of various injector for medical purpose after fog-spray nozzle, On the mucous membrane or other histoorgans that various medicaments can be sent forth to human body or animal.

Known conventional injector for medical purpose includes overcoat and core bar.Enough transparencies are cased with outside.It is cased with overcoat cavity outside. The overcoat cavity end opening before and after overcoat respectively.There is back cover portion the front end of overcoat cavity.Before the back cover portion of overcoat cavity There is conehead at end.The conehead of overcoat can be outer cone joint, or outer cone locked joints.During the conehead of overcoat can be The conehead of hair style, or the conehead of inclined hair style.There is cone head hole in conehead.Cone head hole and overcoat cavity insertion.In overcoat There is overcoat crimping at rear portion.There is volume scale on the outer surface of overcoat.The rear end of core bar has by hand, and there is sealing ring front portion.Core bar Sealing ring inserted at overcoat cavity open rearward end in overcoat cavity after, manipulate core bar can make sealing ring empty in overcoat by hand Intracavitary is moved forward and backward, and the sealing of the outer wall of sealing ring and the inwall formation injector for medical purpose of overcoat cavity coordinates.

The first unsatisfactory place of conventional injector for medical purpose is, after disposable sterilized syringe use, band The injection needle of bacterium is exposed outside, easily cause serious infection to injure human body, also, due to the overcoat of syringe needle and syringe Conehead engagement is tighter, and the action that both hands shed syringe needle and time set sheath closure syringe needle is to cause medical personnel to occur pricking wound most High-risk action.World Health Organization WHO reported just have within every 30 seconds a medical personnel to be contaminated syringe needle and stab in 1999.The Two kinds of unsatisfactory places are, disposable sterilized syringe and injection needle with sheath are separated in packing box； Need first to take out syringe from packing box when in use, then the injection needle with sheath is taken out from packing box, then Remove after sheath by injection needle install on the injector；After use, it is necessary to which injection needle is removed from syringe, then find shield Set entangles injection needle, or is directly entangled the injection needle installed on the injector with sheath, is injured to prevent exposed injection needle Human body；Whole operation process is cumbersome, and also easily user of service is damaged.The third unsatisfactory place is, once Property using asepsis injector by after use, reuse disposable sterilized syringe can harmful to human health.

United States Patent (USP) US20120296277A1, US20150174339A1, US20150314079A1, The various safety injectors introduced in US20160008554A1 and US20160271340A1, after use, using various sides Method is taken in the injection needle carried disease germs in the overcoat cavity of syringe, it is to avoid the injection needle carried disease germs is caused serious injury to human body. The first unsatisfactory place of above-mentioned various safety injectors is that the part of above-mentioned safety injector compares conventional syringe Part it is more more complicated, the overall volume of safety injector is bigger, assembles also more difficult, therefore production cost wants high It is many.Second of unsatisfactory place is that the chamber that fills of above-mentioned safety injector has multiple parts, is difficult to during topping up completely The gas for filling chamber of safety injector is excluded, meeting is damaged in the intravascular generation aeroembolism of human body to human body.The Three kinds of unsatisfactory places are, after above-mentioned safety injector use, and most of core bar stretches out overcoat, the entirety formed after use Volume is larger, and follow-up destroy is made troubles.4th kind of unsatisfactory place be, the injection needle of above-mentioned safety injector Between overcoat for gap coordinate, by the injection of safety injector be needled into human body muscle and it is intravascular when, injection needle Needle point is easily swung, and causes operational error.

By above-mentioned it will be clear that known safety injector also needs to be improved further so that safety-type note The production cost of emitter is lower, and safety injector convenience more secure when used, safety injector is more easy at destruction after Reason.

The content of the invention

The first object of the present invention is to propose a kind of safety injector, and realizing the rear portion of overcoat cavity has the lock of convex Tight circumference projection, there is the locking in locking circumferential recess, overcoat cavity the periphery of core bar, and circumferential projection is resiliently flexible crosses The circumferential projection of locking of core bar enters in the locking circumferential recess of core bar.After safety injector use, for single suction and The use requirement of injection, it is contemplated that disposable process once completion, automatic start prevent reuse function, will be safety-type The overcoat and core bar of syringe are locked together, and then pinch the taper lip of the flat injection needle away from syringe needle, and injection needle can depart from The conehead of the overcoat of safety injector, then the injection needle carried disease germs is put into collecting box；Can for the core bar before single injection With the use requirement repeatedly aspirated, it is contemplated that disposable process once completion, pinch the flat injection needle away from syringe needle Taper lip, injection needle can depart from the conehead of the overcoat of safety injector, can both the injection needle carried disease germs be put into collection In case, the injection needle carried disease germs can also be taken in the utensil intracavitary of the core bar of safety injector, then optionally manually opened It is dynamic to prevent from reusing function, the overcoat and core bar of safety injector are locked together or do not locked together；Reach and operated The purpose of syringe needle will not be touched in journey, so as to both the injection needle carried disease germs can be avoided to cause serious injury human body, again may be used To avoid being reused.

The second object of the present invention is to propose a kind of safety injector, and realizing the rear portion of overcoat cavity has determining for convex The circumferential projection in position, there are multiple positioning circumferential recess of positioning axial projection and the axial arranged distribution along core bar the periphery of core bar. When rotation core bar causes the positioning axial projection that the circumferential projection elastic deformation of the positioning in overcoat cavity crosses core bar to enter core bar Chosen positioning circumferential recess in after, the sealing ring for the core bar being constrained in overcoat cavity and the back cover portion of overcoat cavity Between chamber formation safety injector selected liquid capacity；Make it that the positioning in overcoat cavity is circumferential when rotating core bar The positioning circumferential recess that projection elastic deformation crosses core bar is removed after the positioning circumferential recess of core bar, manipulates can making by hand for core bar Sealing ring is moved forward and backward in overcoat cavity；Reach that the filling amount of safety injector can be with the purpose of accurate lock.

The third object of the present invention is to propose a kind of safety injector, realizes that the bellmouth in injection needle is inserted in overcoat Conehead on when, injection needle is fixed on the conehead of overcoat, reach by inject be needled into human body muscle or it is intravascular when keep away Exempt from the purpose that the needle point of injection needle is swung, so as to avoid causing operational error；Realize after safety injector use, only The taper lip of the flat injection needle away from injection needle need to be pinched, injection needle can depart from the conehead of the overcoat of safety injector, Both the injection needle carried disease germs can be put into collecting box, the injection needle carried disease germs can also be taken in the core bar of safety injector Utensil intracavitary, reaches the purpose that syringe needle is avoided contact in operating process, so as to avoid the injection needle carried disease germs from injuring human body.

The fourth object of the present invention is to propose a kind of safety injector, and that realizes that there are a lateral openings side of core bar can Insert the utensil chamber of instrument used for injection, core bar presses hand jagged positioned at the side of utensil chamber.Used in safety injector Before, instrument used for injection is placed into the utensil intracavitary of core bar；In safety injector by use, being pinched by the indentation, there of hand in core bar The taper lip of the instrument used for injection of the utensil intracavitary of core bar is firmly placed into, instrument used for injection is taken out at the lateral openings of utensil chamber； After safety injector is by use, after the instrument used for injection being inserted on the conehead of overcoat is removed, then by instrument used for injection from utensil The lateral openings of chamber dispose the utensil intracavitary into core bar, and then shifting core bar onto behind bottom most of core bar enters in overcoat, reaches The less purpose of overall volume of the safety injector ultimately formed, so as to be offered convenience to follow-up destroy.

The fifth object of the present invention is to propose a kind of safety injector, the zero of the safety injector of the realization present invention The part of the sheath of a part injection needle fewer than conventional injector for medical purpose, the knot of the topping up chamber of safety injector of the invention Structure is identical with conventional injector for medical purpose, safety injector of the invention both reached be easy to exclude the gas for filling chamber and It is easy to the purpose of assembling, reaches that the production cost of production cost and conventional injector for medical purpose is similar again, and than existing safety The much lower purpose of the production cost of type syringe.

The purpose of the present invention is achieved through the following technical solutions：

The safety injector of the present invention includes overcoat and core bar.Enough transparencies are cased with outside.It is cased with overcoat cavity outside. The overcoat cavity end opening before and after overcoat respectively.There is back cover portion the front end of overcoat cavity.Before the back cover portion of overcoat cavity There is conehead at end.The conehead of overcoat can be outer cone joint, or outer cone locked joints, can be the cone of middle hair style Head, or the conehead of inclined hair style.There is cone head hole in conehead.Cone head hole and overcoat cavity insertion.Have outer at the rear portion of overcoat Cover crimping.There is volume scale on the outer surface of overcoat.The rear end of core bar has by hand, and there is sealing ring front portion.Sealing ring can be with Monoblock type is made in core bar, can also be made with core bar split type.The sealing ring of core bar inserts outer at overcoat cavity open rearward end After covering in cavity, manipulate core bar can be such that sealing ring is moved forward and backward in overcoat cavity by hand, and the outer wall and overcoat of sealing ring are empty The sealing of the inwall formation safety injector of chamber coordinates.

The syringes such as injection needle, fog-spray nozzle or conehead cap can be plugged on the conehead of the overcoat of the safety injector of the present invention Tool.There is the circular cone inclined-plane of greater obliquity the rear end of the conehead of overcoat.There are taper lip and bellmouth in the rear portion of instrument used for injection.Injection The taper lip of utensil is located at the rear portion of bellmouth.Axial groove can be distributed with the wall of the taper lip of instrument used for injection. The conehead and circular cone inclined-plane of overcoat and the taper lip and bellmouth of instrument used for injection constitute the interface of instrument used for injection.Work as instrument used for injection Bellmouth when being inserted on the conehead of overcoat, instrument used for injection is fixed on the conehead of overcoat.When the taper for pinching flat instrument used for injection During lip, the circular cone inclined-plane of rear end of the taper lip along the conehead of overcoat is moved, so that taper lip pushing syringe tool is forward It is mobile so that the bellmouth of instrument used for injection departs from the conehead of overcoat.

The side of the core bar of the safety injector of the present invention can have the utensil chamber of lateral openings.Utensil intracavitary can be inserted The instruments used for injection such as injection needle, fog-spray nozzle or conehead cap.There is intracavitary circumferential recess the rear end of utensil chamber.The intracavitary of utensil chamber is circumferentially recessed Circumferential width at the lateral openings of groove is less than the diameter of the taper lip of instrument used for injection and the intracavitary circumferential recess of utensil chamber Diameter.The hand of pressing of core bar can be with jagged in the side positioned at utensil chamber.When instrument used for injection is placed into the utensil intracavitary of core bar, The taper lip elastic deformation of instrument used for injection is crossed at the lateral openings of intracavitary circumferential recess of utensil chamber, into the chamber of utensil chamber In inner circumferential groove so that the taper lip of instrument used for injection is constrained in the intracavitary circumferential recess of utensil chamber, by instrument used for injection Constrain in utensil intracavitary.Safety injector is by before use, injection needle or the first-class instrument used for injection of spraying are placed into the utensil of core bar Intracavitary.Safety injector is by use, in the injection that the utensil intracavitary for being placed into core bar is pinched by the indentation, there of hand of core bar The taper lip of utensil, takes out instrument used for injection, then the bellmouth of instrument used for injection is inserted in into overcoat at the lateral openings of utensil chamber Conehead on so that instrument used for injection is fixed on the conehead of overcoat.Safety injector will be inserted in the cone of overcoat by after use Instrument used for injection on head is removed, then the lateral openings of instrument used for injection from utensil chamber are disposed into the utensil intracavitary into core bar.

The flexible hook in rear portion of the overcoat cavity of the safety injector of the present invention.There is the circumference of convex convex on elastic hook Block.The axial sides of circumferential projection have projection axial constraint inclined-plane.There is projection circumferentially constraint the circumferential both sides of circumferential projection respectively Inclined-plane.The periphery of core bar can have circumferential recess.The fluted axial constraint inclined-plane of axial sides of circumferential recess.Circumferential recess The circumferential fluted circumferential constraint inclined-plane of both sides difference.The peripheral side of circumferential recess has axial projection.The peripheral side of axial projection There is projection circumferentially constraint inclined-plane in face.

There can be the circumferential projection of positioning in circumferential projection in overcoat cavity.The axial both sides of the circumferential projection of positioning have respectively Projection axial constraint inclined-plane.There is projection circumferentially constraint inclined-plane the circumferential both sides of the circumferential projection of positioning respectively.The circumferential recess of core bar In can have positioning circumferential recess.Axial arranged distribution of multiple positioning circumferential recess along core bar.Each positioning circumferential recess Distinguish fluted axial constraint inclined-plane in axial both sides.The fluted circumferential constraint of circumferential both sides difference of each positioning circumferential recess is oblique Face.The peripheral side of positioning circumferential recess has positioning axial projection.The peripheral side of positioning axial projection has projection circumferentially constraint Inclined-plane.The circumferential projection elastic deformation of the positioning in overcoat cavity is caused to cross the convex of the positioning axial projection of core bar when rotating core bar After block circumference constraint inclined-plane enters in the chosen positioning circumferential recess of core bar, the selected positioning circumferential recess of core bar Circumferentially two projections circumference constraint inclined-plane of the constraint inclined-plane respectively with the circumferential projection of positioning in overcoat cavity is mutual for two grooves Constraint, hinders core bar to be rotated in overcoat cavity, two groove axial constraints of the selected positioning circumferential recess of core bar are oblique Two projection axial constraint inclined-planes of the face respectively with the circumferential projection of positioning in overcoat cavity are mutually constrained, and hinder the sealing of core bar Circle is moved forward and backward in overcoat cavity, between the sealing ring for the core bar being constrained in overcoat cavity and the back cover portion of overcoat cavity Chamber formation safety injector selected liquid capacity.Cause the circumferential projection of the positioning in overcoat cavity when rotating core bar The groove that elastic deformation crosses the positioning circumferential recess of core bar is circumferentially removed after the positioning circumferential recess of core bar on constraint inclined-plane, core bar The projection of positioning axial projection circumferentially constraint inclined-plane hinders the circumferential projection of positioning in overcoat cavity to enter positioning week of core bar Into groove, manipulate core bar can be such that sealing ring is moved forward and backward in overcoat cavity by hand.

The axial both sides of the circumferential projection of positioning in overcoat cavity can have small inclination projection axial constraint inclined-plane respectively.When When the circumferential projection of positioning in overcoat cavity is located in the chosen positioning circumferential recess of core bar, the chosen positioning of core bar Two projections of the two groove axial constraint inclined-planes of circumferential recess respectively with the circumferential projection of positioning in overcoat cavity are axial about Beam inclined-plane is mutually constrained, and is hindered the sealing ring of core bar to be moved forward and backward in overcoat cavity, is constrained on the core bar in overcoat cavity Sealing ring and overcoat cavity back cover portion between formed safety injector selected liquid capacity.Cause when promoting core bar The small inclination projection axial constraint inclined-plane elastic deformation of the circumferential projection of positioning in overcoat cavity is crossed the chosen of core bar and determined After the groove axial constraint inclined-plane of position circumferential recess enters in another positioning circumferential recess, another positioning of core bar is circumferential Two projection axial constraints of the two groove axial constraint inclined-planes of groove respectively with the circumferential projection of positioning in overcoat cavity are oblique Face is mutually constrained, hinder core bar sealing ring in overcoat cavity move forward and backward, the core bar being constrained in overcoat cavity it is close The liquid capacity after chamber formation being changed of safety injector between seal and the back cover portion of overcoat cavity.

The axial both sides of the positioning circumferential recess of core bar can have small inclination groove axial constraint inclined-plane respectively.When overcoat is empty When the circumferential projection of positioning of intracavitary is located in the chosen positioning circumferential recess of core bar, the chosen positioning of core bar is circumferentially recessed The two projection axial constraint inclined-planes of two groove axial constraint inclined-planes of groove respectively with the circumferential projection of positioning in overcoat cavity Mutually constraint, hinders the sealing ring of core bar to be moved forward and backward in overcoat cavity, the sealing for the core bar being constrained in overcoat cavity The selected liquid capacity of safety injector is formed between circle and the back cover portion of overcoat cavity.Cause overcoat empty when promoting core bar The circumferential projection elastic deformation of positioning of intracavitary crosses the small inclination groove axial constraint of the chosen positioning circumferential recess of core bar After inclined-plane enters in another positioning circumferential recess, two groove axial constraints of another positioning circumferential recess of core bar are oblique Two projection axial constraint inclined-planes of the face respectively with the circumferential projection of positioning in overcoat cavity are mutually constrained, and hinder the sealing of core bar Circle is moved forward and backward in overcoat cavity, between the sealing ring for the core bar being constrained in overcoat cavity and the back cover portion of overcoat cavity Chamber formation being changed of safety injector after liquid capacity.

There can be the circumferential projection of locking in circumferential projection in overcoat cavity.The circumferential projection of locking has projection axial constraint oblique Face.There is projection circumferentially constraint inclined-plane the circumferential both sides of the circumferential projection of locking respectively.There can be locking week in the circumferential recess of core bar To groove.Lock the axially fluted axial constraint inclined-plane of circumferential recess.The circumferential both sides difference for locking circumferential recess is fluted Circumferential constraint inclined-plane.The peripheral side of locking circumferential recess has locking axial projection.Cause when rotating core bar in overcoat cavity The circumferential projection elastic deformation of locking cross core bar locking axial projection enter core bar locking circumferential recess it is interior after, the lock of core bar The projection axial constraint inclined-plane on the groove axial constraint inclined-plane of tight circumferential recess and the circumferential projection of the locking in overcoat cavity is mutual Constraint, two grooves of the locking circumferential recess of core bar circumferentially constraint inclined-plane respectively with the locking circumference projection in overcoat cavity Two projections are circumferentially mutually constrained on constraint inclined-plane so that core bar is locked on overcoat cavity.

There can be the circumferential projection of locking in circumferential projection in overcoat cavity.The circumferential projection of locking has projection axial constraint oblique Face.There is projection circumferentially constraint inclined-plane the circumferential both sides of the circumferential projection of locking respectively.There can be locking week in the circumferential recess of core bar To groove.Lock the axially fluted axial constraint inclined-plane of circumferential recess.The circumferential both sides difference for locking circumferential recess is fluted Circumferential constraint inclined-plane.The axial sides of locking circumferential recess have the circumferential projection of locking.Cause when promoting core bar in overcoat cavity The circumferential projection elastic deformation of locking cross core bar the circumferential projection of locking enter in the locking circumferential recess of core bar after, the lock of core bar The projection axial constraint inclined-plane on the groove axial constraint inclined-plane of tight circumferential recess and the circumferential projection of the locking in overcoat cavity is mutual Constraint, two grooves of the locking circumferential recess of core bar circumferentially constraint inclined-plane respectively with the locking circumference projection in overcoat cavity Two projections are circumferentially mutually constrained on constraint inclined-plane so that core bar is locked on overcoat cavity.

The overcoat of the safety injector of the present invention can include liquid filling bottle and outer cover.Liquid filling bottle has the first overcoat cavity. First overcoat cavity is respectively in front and rear end opening.There is back cover portion the front portion of first overcoat cavity.In the back cover of the first overcoat cavity There is conehead the front end in portion.There is cone head hole in conehead.Cone head hole and the first overcoat cavity insertion.It is covered with the second overcoat cavity.The The two overcoat cavitys end opening before and after outer cover respectively.There are the buckle of convex, elastic hook and outwards in the rear portion of second overcoat cavity The overcoat crimping of extension.When the second overcoat cavity of outer cover is wrapped in the periphery of liquid filling bottle, the second overcoat cavity of outer cover Liquid filling bottle is locked in the second overcoat cavity of outer cover by snap hook on the back edge of liquid filling bottle, and the conehead of liquid filling bottle is from outer Stretched out at the front opening of cover.When the sealing ring of core bar is inserted in the first overcoat cavity at the second overcoat cavity open rearward end Afterwards, manipulate core bar can be such that sealing ring is moved forward and backward in the first overcoat cavity by hand, and the outer wall of sealing ring and the first overcoat are empty The sealing of the inwall formation safety injector of chamber coordinates.

Injection needle, fog-spray nozzle or conehead cap can be plugged on the conehead of the front end in the back cover portion of the first overcoat cavity of liquid filling bottle Deng instrument used for injection.There can be the circular cone inclined-plane of high inclination-angle at the front opening of outer cover.When the bellmouth of instrument used for injection is inserted in topping up When on the conehead of bottle, instrument used for injection is fixed on the conehead of liquid filling bottle.When pinching the taper lip of flat instrument used for injection, taper lip Circular cone inclined-plane movement at the front opening of edge outer cover, taper lip pushing syringe tool is moved forward so that instrument used for injection Bellmouth depart from liquid filling bottle conehead.

Brief description of the drawings

Fig. 1 is the front view for representing the safety injector of first embodiment of the invention before use；

Fig. 2 is to represent Fig. 1 safety injector in front view to be removed or when having inserted injection needle；

Fig. 3 is the rearview for representing Fig. 2；

Fig. 4 is the front view for representing Fig. 1 safety injector when to be used；

Fig. 5 be represent Fig. 1 safety injector be in self-locking state when rearview；

Fig. 6 is the 6-6 sectional views for representing Fig. 5；

Fig. 7 is the 7-7 sectional views for representing Fig. 5；

Fig. 8 is the outside drawing of the core bar for the safety injector for representing Fig. 1；

Fig. 9 is the outside drawing at the back side for representing Fig. 8；

Figure 10 is the outside drawing of the overcoat for the safety injector for representing Fig. 1；

Figure 11 is the outside drawing of the injection needle for the safety injector for representing Fig. 1；

Figure 12 is to represent the front view that Figure 11 injection needle is inserted in Fig. 8 core bar；

Figure 13 is the rearview for representing another core bar；

Figure 14 is to represent to configure front view of the safety injector of the first embodiment of fog-spray nozzle before use；

Figure 15 is the front view for representing Figure 14 safety injector when having installed fog-spray nozzle；

Figure 16 is the outside drawing for the fog-spray nozzle for representing Figure 15；

Figure 17 is to represent the front view that Figure 16 fog-spray nozzle is inserted in Fig. 8 core bar；

Figure 18 is that the safety injector for representing second embodiment of the invention is having been injected into the outside drawing of decoction state；

Figure 19 is the outside drawing for representing Figure 18 safety injector when to be used；

Figure 20 is the top view for the safety injector for representing Figure 18；

Figure 21 is the 21-21 sectional views for representing Figure 20；

Figure 22 is the 22-22 sectional views for representing Figure 20；

Figure 23 is to represent the front view of Figure 18 safety injector after use；

Figure 24 is the front view inserted in core bar of injection needle for the safety injector for representing Figure 18；

Figure 25 be represent Figure 18 safety injector be in self-locking state when outside drawing；

Figure 26 is the outside drawing at the back side for representing Figure 25；

Figure 27 is the outside drawing of the end part seal cap for the safety injector for representing Figure 18；

Figure 28 is the outside drawing of the core bar for the safety injector for representing Figure 18；

Figure 29 is the outside drawing at the back side for representing Figure 28；

Figure 30 is the outside drawing of the overcoat for the safety injector for representing Figure 18；

Figure 31 is the outside drawing at the back side for representing Figure 30；

Figure 32 is that the safety injector for representing second embodiment installs the front view of the safety injector of fog-spray nozzle；

Figure 33 is that the safety injector for representing third embodiment of the invention is having been injected into the outside drawing of decoction state；

Figure 34 is outward appearance of the first the selectable operating process for the safety injector for representing Figure 33 when to be used Figure；

Figure 35 is the top view for the safety injector for representing Figure 33；

Figure 36 is the 36-36 sectional views for representing Figure 35；

Figure 37 is the 37-37 sectional views for representing Figure 35；

Figure 38 is to represent outside drawing when Figure 34 safety injector is in self-locking state after use；

Figure 39 is outward appearance of second of the selectable operating process of the safety injector for representing Figure 33 when to be used Figure；

Figure 40 is the safety injector front view that injection needle is inserted in core bar after use for representing Figure 39；

Figure 41 is to represent outside drawing when Figure 39 safety injector is in self-locking state after use；

Figure 42 is the front view of the core bar for the safety injector for representing Figure 33；

Figure 43 is to represent the front view that injection needle is inserted in Figure 42 core bar；

Figure 44 is the outside drawing of the overcoat for the safety injector for representing Figure 33；

Figure 45 is the outside drawing at the back side for representing Figure 44；

Figure 46 is the outside drawing for representing the safety injector of fourth embodiment of the invention before use；

Figure 47 is the outside drawing for representing Figure 46 safety injector when to be used；

Figure 48 is the front view of the outer cover for the safety injector for representing Figure 46；

Figure 49 is the outside drawing for the outer cover for representing Figure 48；

Figure 50 is the front view of the liquid filling bottle for the safety injector for representing Figure 46；

Figure 51 is the outside drawing for the liquid filling bottle for representing Figure 50；

Figure 52 is the outside drawing of the overcoat for the safety injector for representing Figure 46；

Figure 53 is the outside drawing of the core bar for the safety injector for representing Figure 46；

Figure 54 is the outside drawing inserted in core bar of injection needle for the safety injector for representing Figure 46.

Embodiment

Way of example is used below, and the most preferred embodiment of the safety injector of the present invention is stated with reference to accompanying drawing.The present invention's Scope will be indicated in the claims.It should be appreciated that some or all accompanying drawing is provided to illustrate highly preferred embodiment of the present invention Explanation sketch, and do not depict the full-size(d) of shown part.With reference to the detailed narration of most preferred embodiment, it will more clear Understand to Chu and reach above-mentioned and other objects and advantages the practical ways of the present invention.

In the the accompanying drawings and the following description, term " near " and " rear " refer to close to the position of safety injector operator, And term " remote " and " preceding " refer to the position away from safety injector operator.Term " axial direction " is with safety injector On the basis of the long axis direction of overcoat, term " circumference " is the contour direction using the radial section of the overcoat of safety injector as base It is accurate.The term in other positions and direction can understand with following description with reference to the accompanying drawings.

Fig. 1 to Figure 12 is the safety injector 1 for representing first embodiment of the invention.Safety injector 1 includes overcoat 2 With core bar 3.Overcoat 2 (see Fig. 1, Fig. 5, Fig. 6 and Figure 10) has overcoat cavity 4.Open rearward end 5 of the overcoat cavity 4 in overcoat 2.Outside There is back cover portion 6 front end of set cavity 4.There is conehead 7 in the front end in the back cover portion 6 of overcoat cavity 4.There is cone head hole 8 in conehead 7.Cone Head bore 8 is formed through the front opening of overcoat 2 with overcoat cavity 4.There is overcoat crimping 9 at the rear portion of overcoat 2.In the outer of overcoat 2 There is volume scale 10 on surface.The rear end of core bar 3 (see Fig. 8, Fig. 9 and Figure 12) has by hand 11, and there is sealing ring 12 front portion.Core bar 3 Sealing ring 12 inserted at the open rearward end 5 of overcoat cavity 4 in overcoat cavity 4 after, manipulate core bar 2 can make sealing ring by hand 11 12 move forward and backward in overcoat cavity 4, the outer wall 13 of sealing ring 12 and the formation safety injector 1 of inwall 14 of overcoat cavity 4 Sealing coordinate.

Injection needle 15 can be plugged on the conehead 7 of overcoat 2 (see Fig. 4).There is the circle of greater obliquity the rear end of the conehead 7 of overcoat 2 Bore inclined-plane 16 (see Fig. 1 to Fig. 3).There are taper lip 17 and bellmouth 18 in the rear portion of injection needle 15 (see Figure 11).Injection needle 15 Taper lip 17 is located at the rear portion of bellmouth 18.Axial groove 19 is distributed with the wall of the taper lip 17 of injection needle 15.Note The groove 19 penetrated in the taper lip 17 of pin 15 can both increase the friction of taper lip 17, can be easy to pinch flat taper lip again 17.When the bellmouth 18 of injection needle 15 is inserted on the conehead 7 of overcoat 2, injection needle 15 be fixed on the conehead 7 of overcoat 2 (see Fig. 4).When pinching the taper lip 17 of flat injection needle 15, the circular cone inclined-plane 16 of rear end of the taper lip 17 along conehead 7 is moved, from And taper lip 17 promotes injection needle 15 to move forward so that the bellmouth 18 of injection needle 15 departs from the conehead 7 of overcoat 2.

There is the utensil chamber 20 of lateral openings the side of core bar 3.Injection needle 15 can be inserted in utensil chamber 20 (see Figure 12).Utensil There is intracavitary circumferential recess 21 rear end of chamber 20 (see Fig. 8).Circumference at the lateral openings of the intracavitary circumferential recess 21 of utensil chamber 20 Width is less than the diameter of the diameter of the taper lip 17 of injection needle 15 and the intracavitary circumferential recess 21 of utensil chamber 20.Core bar 3 is pressed Hand 11 is positioned at the side of injection needle 15 jagged 22 (see Fig. 8).When injection needle 15 is placed into the utensil chamber 20 of core bar 3, The elastic deformation of taper lip 17 of injection needle 15 is crossed at the lateral openings of intracavitary circumferential recess 21 of utensil chamber 20, into utensil In the intracavitary circumferential recess 21 of chamber 20 so that the taper lip 17 of injection needle 15 is constrained on the intracavitary circumferential recess of utensil chamber 20 In 21, injection needle 15 is constrained in utensil chamber 20 (see Figure 12).In safety injector 1 by before use, injection needle 15 is set to Enter in the utensil chamber 20 of core bar 3 (see Fig. 1).In safety injector 1 by use, pressing at the breach 22 of hand 11 in core bar 3 The taper lip 17 (see Fig. 2) for the injection needle 15 being placed into the utensil chamber 20 of core bar 3 is pinched, from the lateral openings of utensil chamber 20 Place takes out injection needle 15, then the bellmouth 18 of injection needle 15 is inserted on the conehead 7 of overcoat 2 so that injection needle 15 is fixed on (see Fig. 4) on the conehead 7 of overcoat 2.After safety injector 1 is by use, by the injection needle 15 being inserted on the conehead 7 of overcoat 2 After removing, then the lateral openings of injection needle 15 from utensil chamber 20 are disposed in the utensil chamber 20 of core bar 3 (see Fig. 2).

The flexible hook 45 in rear portion of overcoat cavity 4.There is the circumferential projection 23 of locking of convex on elastic hook 45 (see Fig. 5 and figure 6).There are high inclination-angle projection axial constraint inclined-plane 24, the circumferential projection 23 of locking in the axial direction of the circumferential projection 23 of locking in overcoat cavity 4 Circumferential both sides have respectively high inclination-angle projection circumferentially constraint inclined-plane 25 and 26 (see Fig. 6, Fig. 7 and Figure 10).The periphery of core bar 3 has Lock circumferential recess 27 (see Fig. 3 and Fig. 9).There is high inclination-angle groove axial constraint inclined-plane 28 axial direction of locking circumferential recess 27.Lock There is high inclination-angle groove circumferentially constraint inclined-plane 29 and 30 the circumferential both sides of tight circumferential recess 27 respectively.Lock the circumference of circumferential recess 27 There is locking axial projection 31 side.The side of locking axial projection 31 has small inclination projection circumferentially to constrain inclined-plane 32 and incline greatly respectively Angle projection circumferentially constrains inclined-plane 33.In safety injector 1 by before use, the high inclination-angle of the locking axial projection 31 of core bar 3 is convex Circumferentially constraint inclined-plane 33 prevents the circumferential projection 23 in overcoat cavity 4 from deviateing locking axial projection 31 to block (see Fig. 3).Safety-type Syringe 1 after the injection needle 15 being inserted on the conehead 7 of overcoat 2 is removed, injection needle 15 is inserted the device of core bar 7 by after use Have in chamber 20, now, rotate core bar 3 and cause the circumferential elastic deformation of projection 23 of the locking in overcoat cavity 4 to cross the locking of core bar 3 The circumferential constraint inclined-plane 32 of the small inclination projection of axial projection 31, into the locking circumferential recess 27 of core bar 3 in after, the lock of core bar 3 The high inclination-angle on the high inclination-angle groove axial constraint inclined-plane 28 of tight circumferential recess 27 and the circumferential projection 23 of the locking in overcoat cavity 4 is convex Block axial constraint inclined-plane 24 is mutually constrained, and two high inclination-angle grooves of the locking circumferential recess 27 of core bar 3 circumferentially constrain inclined-plane 29 Inclined-plane 25 and 26 is circumferentially constrained with 30 two high inclination-angle projections respectively with the circumferential projection 23 of locking in overcoat cavity 4 mutually about Beam；Meanwhile, the auditory tone cues sent during circumferential 23 elastic deformation of projection of locking in overcoat cavity 4 and is placed into core bar at core bar 3 Injection needle 15 in 3 utensil chamber 20 has been locked in overcoat 4 (see Fig. 5 to Fig. 7).

Core bar 3 in safety injector 1 can also be replaced with core bar 34 (see Figure 13).There is locking week the periphery of core bar 34 To groove 35 (see Figure 13).There is high inclination-angle groove axial constraint inclined-plane 36 axial direction of locking circumferential recess 35.Lock circumferential recess There is high inclination-angle groove circumferentially constraint inclined-plane 37 and 38 35 circumferential both sides.The axial sides of locking circumferential recess 35 have locking circumferential Projection 39.There is small inclination projection axial constraint inclined-plane 40 side of the circumferential projection 39 of locking.Cause overcoat empty when promoting core bar 34 The small inclination projection axial constraint that the circumferential elastic deformation of projection 23 of locking in chamber 4 crosses the circumferential projection 39 of locking of core bar 34 is oblique After face 40 enters in the locking circumferential recess 35 of core bar 34, the high inclination-angle groove axial constraint of the locking circumferential recess 35 of core bar 34 The high inclination-angle projection axial constraint inclined-plane 24 on inclined-plane 36 and the circumferential projection 23 of locking in overcoat cavity 4 is mutually constrained, core bar 34 Two high inclination-angle grooves of locking circumferential recess 35 circumferentially constraint inclined-plane 37 and 38 is circumferential with locking in overcoat cavity 4 respectively Two high inclination-angle projections of projection 23 are circumferentially mutually constrained on constraint inclined-plane 25 and 26；Meanwhile, the locking in overcoat cavity 4 is circumferentially convex The auditory tone cues sent during 23 elastic deformation of block, core bar 34 has been locked in overcoat cavity 4.

Injection needle 15 in safety injector 1 can also be replaced with fog-spray nozzle 41.There is taper lip at the rear portion of fog-spray nozzle 41 Side 42 and bellmouth 43 (see Figure 16).The taper lip 42 of fog-spray nozzle 41 is located at the rear portion of bellmouth 43.The taper of fog-spray nozzle 41 Axial groove 44 is distributed with the wall of lip 42.In safety injector 1 by before use, fog-spray nozzle 41 is placed into core bar 3 (see Figure 14) in utensil chamber 20.When fog-spray nozzle 41 being installed on safety injector 1, the utensil chamber 20 of core bar 3 can will be placed into After interior fog-spray nozzle 41 takes out, the bellmouth 43 of fog-spray nozzle 41 is inserted on the conehead 7 of overcoat 2 so that fog-spray nozzle 41 is fixed (see Figure 15) on the conehead 7 of overcoat 2.After safety injector 1 is by use, the fog-spray nozzle 41 being inserted on conehead 7 is removed Afterwards, fog-spray nozzle 41 is placed into the utensil chamber 20 of core bar 3 (see Figure 17) again.

Figure 18 to Figure 31 is the safety injector 50 for representing second embodiment of the invention.Safety injector 50 includes outer Set 51 and core bar 52.Overcoat 51 (see Figure 21, Figure 25, Figure 30 and Figure 31) has overcoat cavity 53.Overcoat cavity 53 is in overcoat 51 There is opening 54 rear end.There is back cover portion 55 front end of overcoat cavity 53.There is conehead 56 in the front end in the back cover portion 55 of overcoat cavity 53. There is cone head hole 57 in conehead 56.Cone head hole 57 and the insertion of overcoat cavity 53.There is overcoat crimping 58 at the rear portion of overcoat 51.In overcoat There is volume scale 59 on 51 outer surface.The rear end of core bar 52 (see Figure 28 and Figure 29) has by hand 60, and there is sealing ring 61 front portion.Core After the sealing ring 61 of bar 52 is inserted at the open rearward end 54 of overcoat cavity 53 in overcoat cavity 53 (see Figure 21), core bar 51 is manipulated By hand 60 sealing ring 61 can be made to be moved forward and backward in overcoat cavity 53, the outer wall 62 of sealing ring 61 and the inwall 63 of overcoat cavity 53 The sealing for forming safety injector 50 coordinates.The flexible hook 48 and 49 in rear portion of overcoat cavity 53 (see Figure 30 and Figure 31).Bullet Property hook 48 on have the circumferential projection 71 of locking of convex (see Figure 30).There is the circumferential projection 81 of positioning of convex on elastic hook 49 (see figure 31)。

There is the circular cone inclined-plane 64 of greater obliquity the rear end of the conehead 56 of overcoat 51 (see Figure 21 and Figure 24 to Figure 26).Conehead cap There are taper lip 66 and bellmouth 67 in 65 rear portion (see Figure 21 and Figure 27).The taper lip 66 of conehead cap 65 is located at bellmouth 67 Rear portion.When the bellmouth 67 of conehead cap 65 is inserted on the conehead 56 of overcoat 51, conehead cap 65 is fixed on the cone of overcoat 51 (see Figure 20 and Figure 21) on first 56.When pinching the taper lip 66 of flat conehead cap 65, rear end of the taper lip 66 along conehead 56 Circular cone inclined-plane 64 is moved, and taper lip 66 promotes conehead cap 65 to move forward so that the bellmouth 67 of conehead cap 65 departs from overcoat 51 conehead 56.

There is the utensil chamber 68 of lateral openings the side of core bar 52 (see Figure 19 and Figure 28).Injection needle can be inserted in utensil chamber 68 15.There is intracavitary circumferential recess 69 rear end of utensil chamber 68.Circumference at the lateral openings of the intracavitary circumferential recess 69 of utensil chamber 68 Width is less than the diameter of the diameter of the taper lip 17 of injection needle 15 and the intracavitary circumferential recess 69 of utensil chamber 68.Core bar 52 is pressed Hand 60 is positioned at the side of injection needle 15 jagged 70.When injection needle 15 is placed into the utensil chamber 68 of core bar (see Figure 24), The elastic deformation of taper lip 17 of injection needle 15 is crossed at the lateral openings of intracavitary circumferential recess 69 of utensil chamber 68, into utensil In the intracavitary circumferential recess 69 of chamber 68 so that the taper lip 17 of injection needle 15 is constrained on the intracavitary circumferential recess of utensil chamber 68 In 69, injection needle 15 is constrained in utensil chamber 68.(see Figure 18) before safety injector 50 is by use, injection needle 15 is set to Enter in the utensil chamber 68 of core bar 52.When safety injector 50 is used (see Figure 19), in the breach for pressing hand 60 of core bar 52 The taper lip 17 for the injection needle 15 being placed into the utensil chamber 68 of core bar 52 is pinched at 70, at the lateral openings of utensil chamber 68 Injection needle 15 is taken out, then the bellmouth 20 of injection needle 15 is inserted on the conehead 56 of overcoat 51 so that injection needle 15 is fixed on On the conehead 56 of overcoat 51.(see Figure 24) after safety injector 50 is by use, the note on the conehead 56 of overcoat 51 will be inserted in Penetrate after pin 15 removes, then the lateral openings of injection needle 15 from utensil chamber 68 are disposed in the utensil chamber 68 of core bar 52.

There is high inclination-angle projection axial constraint inclined-plane 72 axial direction of the circumferential projection 71 of locking in overcoat cavity 53.Locking is circumferential The circumferential both sides of projection 71 have respectively high inclination-angle projection circumferentially constraint inclined-plane 73 and 74.The periphery of core bar 52 has locking circumferential recessed Groove 75 (see Figure 29).There is high inclination-angle groove axial constraint inclined-plane 76 axial direction of locking circumferential recess 75.Lock circumferential recess 75 There is high inclination-angle groove circumferentially constraint inclined-plane 77 and 78 circumferential both sides respectively.The peripheral side of locking circumferential recess 75 has locking axially Projection 79.There is small inclination projection circumferentially constraint inclined-plane 80 side of locking axial projection 79.Used in safety injector 50 Afterwards, after the injection needle 15 being inserted on the conehead 56 of overcoat 51 is removed, then injection needle 15 inserted in the utensil chamber 68 of core bar 52 (see Figure 24), now, rotates core bar 52 and causes the circumferential elastic deformation of projection 71 of the locking in overcoat cavity 53 to cross core bar 52 After the small inclination projection circumference constraint inclined-plane 80 of locking axial projection 79 enters in the locking circumferential recess 75 of core bar 52, core bar 52 Locking circumferential recess 75 high inclination-angle groove axial constraint inclined-plane 76 and the circumferential projection 71 of locking in overcoat cavity 53 it is big Inclination angle projection axial constraint inclined-plane 72 is mutually constrained, and two high inclination-angle grooves of the locking circumferential recess 75 of core bar 52 are circumferentially constrained Inclined-plane 77 and 78 respectively with two high inclination-angle projections of the circumferential projection 71 of locking in overcoat cavity 53 circumferentially constraint inclined-plane 73 and 74 mutually constraints；Meanwhile, lock the auditory tone cues sent during circumferential 71 elastic deformation of projection, the He of core bar 52 in overcoat cavity 53 The injection needle 15 being placed into the utensil chamber 68 of core bar 52 has been locked in overcoat 51 (see Figure 25 and Figure 26).

There is projection axial constraint inclined-plane 82 and 83 the axial both sides of the circumferential projection 81 of positioning in overcoat cavity 53 respectively.It is fixed There is projection circumferentially constraint inclined-plane 84 and 85 the circumferential both sides of the circumferential projection 81 in position respectively.There is positioning the periphery of core bar 52 (see Figure 28) Circumferential recess 86.Axial arranged distribution of multiple positioning circumferential recess 86 along core bar 52.The axial direction of each positioning circumferential recess 86 Distinguish fluted axial constraint inclined-plane 87 and 88 in both sides.Distinguish fluted circumference about in the circumferential both sides of each positioning circumferential recess 86 Beam inclined-plane 89 and 90.The peripheral side of positioning circumferential recess 86 has positioning axial projection 91.Position the peripheral side of axial projection 91 There is projection circumferentially constraint inclined-plane 92 in face.When rotating core bar 52 the circumferential elastic deformation of projection 81 of the positioning in overcoat cavity 53 is got over The projection for crossing the positioning axial projection 91 of core bar 52 circumferentially constrains the chosen positioning circumferential recess that inclined-plane 92 enters core bar 52 After in 93 (see Figure 18 and Figure 20 to Figure 22), circumferentially constraint is oblique for two grooves of the selected positioning circumferential recess 93 of core bar 52 Two projections of the face 96 and 97 respectively with the circumferential projection 81 of positioning in overcoat cavity 53 circumferentially constrain inclined-plane 84 and 85 mutually about Beam, hinders core bar 52 to be rotated in overcoat cavity 53, two groove axial directions of the selected positioning circumferential recess 93 of core bar 52 Constrain two projection axial constraint inclined-planes 82 and 83 of the inclined-plane 94 and 95 respectively with the circumferential projection 81 of positioning in overcoat cavity 53 Mutually constraint, hinders the sealing ring 61 of core bar 52 to be moved forward and backward in overcoat cavity 53, is constrained on the core in overcoat cavity 53 Chamber between the front end of the sealing ring 61 of bar 52 and the back cover portion 55 of overcoat cavity 53 forms the selected of injector for medical purpose 50 Liquid capacity.The circumferential elastic deformation of projection 81 of the positioning in overcoat cavity 53 is caused to cross the positioning of core bar 52 when rotating core bar 52 After the positioning circumferential recess 93 of the groove circumference constraint removal of inclined-plane 96 core bar 52 of circumferential recess 93 (Figure 19, Figure 23 and Figure 24), Circumferentially constraint inclined-plane 92 hinders the circumferential projection 81 of the positioning in overcoat cavity 53 to enter to the projection of the positioning axial projection 91 of core bar 52 Enter in the positioning circumferential recess 86 of core bar 52, manipulate core bar 52 can make sealing ring 61 is front and rear in overcoat cavity 53 to move by hand 60 It is dynamic.In operation, the safety-type note of auditory tone cues sent during circumferential 81 elastic deformation of projection is positioned in overcoat cavity 53 The working condition of emitter 50 has been changed.

Injection needle 15 in safety injector 50 can also be replaced with fog-spray nozzle 41 (see Figure 32).

Figure 33 to Figure 45 is the safety injector 100 for representing third embodiment of the invention.Safety injector 100 includes Overcoat 101 and core bar 102.Overcoat 101 (see Figure 36, Figure 44 and Figure 45) has overcoat cavity 103.Overcoat cavity 103 is in overcoat 101 Open rearward end 104.There is back cover portion 105 front end of overcoat cavity 103.There is cone in the front end in the back cover portion 105 of overcoat cavity 103 First 106.There is the circular cone inclined-plane 107 of greater obliquity the rear end of conehead 106 (see Figure 36, Figure 40 and Figure 41).There is conehead in conehead 106 Hole 108.Cone head hole 108 and the insertion of overcoat cavity 103.There is overcoat crimping 109 and 110 at the rear portion of overcoat 101.In overcoat 101 Outer surface on have volume scale 111.The flexible hook 98 and 99 in rear portion of overcoat cavity 103.There is the lock of convex on elastic hook 98 Tight circumference projection 112 (see Figure 44).There is the circumferential projection 116 of positioning of convex on elastic hook 99 (see Figure 45).In overcoat cavity 103 The axial direction of the circumferential projection 112 of locking have a high inclination-angle projection axial constraint inclined-plane 113, there is high inclination-angle projection circumferential both sides respectively Circumferential constraint inclined-plane 114 and 115.There is the convex of small inclination the axial both sides of the circumferential projection 116 of positioning in overcoat cavity 103 respectively There is projection circumferentially constraint inclined-plane 119 and 120 block axial constraint inclined-plane 117 and 118, circumferential both sides respectively.

The rear end of core bar 102 (see Figure 42) has by hand 121, and there is sealing ring 122 front portion.The sealing ring 122 of core bar 102 is from outer Cover at the open rearward end 104 of cavity 103 in insertion overcoat cavity 103 rear (see Figure 39), can making by hand 121 for manipulation core bar 101 is close Seal 122 is moved forward and backward in overcoat cavity 103, and the outer wall 123 of sealing ring 122 is pacified with the formation of inwall 124 of overcoat cavity 103 The sealing of holotype syringe 100 coordinates.There is the utensil chamber 125 of lateral openings the side of core bar 102 (see Figure 42).Utensil chamber 125 It is interior to insert injection needle 15.There is intracavitary circumferential recess 126 rear end of utensil chamber 125.The intracavitary circumferential recess 126 of utensil chamber 125 Lateral openings at circumferential width be less than injection needle 15 taper lip 17 diameter and the intracavitary circumferential recess of utensil chamber 125 126 diameter.Core bar 102 presses hand 121 positioned at the side of injection needle 15 jagged 127.When injection needle 15 is placed into core bar Utensil chamber 125 in when (see Figure 43), the intracavitary that the elastic deformation of taper lip 17 of injection needle 15 crosses utensil chamber 125 is circumferentially recessed At the lateral openings of groove 126, into the intracavitary circumferential recess 126 of utensil chamber 125 so that the quilt of taper lip 17 of injection needle 15 Constrain in the intracavitary circumferential recess 126 of utensil chamber 125, injection needle 15 is constrained in utensil chamber 125.In safety injector 100 by, (see Figure 33), injection needle 15 is placed into the utensil chamber 125 of core bar 102 before use, is inserted on the conehead 106 of overcoat 101 There is conehead cap 65.When safety injector 100 is used (see Figure 33 and Figure 34), the taper lip 66 of flat conehead cap 65 is first pinched So that the bellmouth 67 of conehead cap 65 departs from the conehead 106 of overcoat 101, then pinched at the breach 127 by hand 121 of core bar 102 The taper lip 17 for the injection needle 15 being firmly placed into the utensil chamber 125 of core bar 102, takes at the lateral openings of utensil chamber 125 Go out injection needle 15, then the bellmouth 20 of injection needle 15 is inserted on the conehead 106 of overcoat 101 so that injection needle 15 is fixed on On the conehead 106 of overcoat 101.(see Figure 40) after safety injector 100 is by use, the taper lip of flat injection needle 15 is pinched 17, after the injection needle 15 being inserted on the conehead 106 of overcoat 101 is removed, then by injection needle 15 from the lateral openings of utensil chamber 125 Dispose in the utensil chamber 125 of core bar 102.

There is locking circumferential recess 128 periphery of core bar 102 (see Figure 34 and Figure 36 to Figure 39).Lock circumferential recess 128 Axially there is high inclination-angle groove axial constraint inclined-plane 129, there is high inclination-angle groove circumferentially constraint inclined-plane 130 and 131 circumferential both sides, axially There are locking axial projection 132 and the circumferential projection 133 of locking in side.The side of locking axial projection 132 has small inclination projection circumferential Constrain inclined-plane 134.There is small inclination projection axial constraint inclined-plane 135 side of the circumferential projection 133 of locking.The periphery of core bar 102 has Position circumferential recess 136 (see Figure 33 to Figure 37).Axial arranged distribution of multiple positioning circumferential recess 136 along core bar 102.Each There is small inclination groove axial constraint inclined-plane 137 and 138 the axial both sides of positioning circumferential recess 136 respectively, and circumferential both sides have respectively Groove circumferentially constrains inclined-plane 139 and 140, and peripheral side has positioning axial projection 141.Position the peripheral side of axial projection 141 There is projection circumferentially constraint inclined-plane 142.

After safety injector 100 extracts liquid, rotate core bar 102 and make it that the positioning in overcoat cavity 103 is circumferentially convex The projection that the elastic deformation of block 116 crosses the positioning axial projection 141 of core bar 102 circumferentially constrains the quilt that inclined-plane 142 enters core bar 102 After in selected positioning circumferential recess 143 (see Figure 33 and Figure 35 to Figure 37), the selected positioning circumferential recess of core bar 102 Circumferentially constraint inclined-plane 144 and 145 is convex with two of the circumferential projection 116 of positioning in overcoat cavity 103 respectively for 143 two grooves Block is circumferentially mutually constrained on constraint inclined-plane 119 and 120, hinders core bar 102 to be rotated in overcoat cavity 103, and this of core bar 102 is selected Positioning circumferential recess 143 two small inclination groove axial constraint inclined-planes 146 and 147 respectively with determining in overcoat cavity 103 Two small inclination projection axial constraint inclined-planes 117 and 118 of the circumferential projection 116 in position are mutually constrained, and hinder the sealing ring of core bar 102 122 in overcoat cavity 103 move forward and backward, the front end of the sealing ring 122 for the core bar 102 being constrained in overcoat cavity 103 with The selected liquid capacity of chamber formation injector for medical purpose 100 between the back cover portion 105 of overcoat cavity 103.

The first selectable operating process after safety injector 100 extracts liquid is (see Figure 34 to Figure 38)： When the projection axial constraint inclined-plane 117 for promoting core bar 102 to cause the small inclination for positioning circumferential projection 116 in overcoat cavity 103 Or 118 elastic deformation cross core bar 102 chosen positioning circumferential recess 143 small inclination groove axial constraint inclined-plane 146 Or after 147 enter in another positioning circumferential recess 136, another positioning the two small of circumferential recess 136 of core bar 102 is inclined Two small inclinations of the angle groove axial constraint inclined-plane 137 and 138 respectively with the circumferential projection 116 of positioning in overcoat cavity 103 are convex Block axial constraint inclined-plane 117 and 118 is mutually constrained, and hinders the sealing ring 122 of core bar 102 to be moved forward and backward in overcoat cavity 103, Chamber shape between the sealing ring 122 for the core bar 102 being constrained in overcoat cavity 103 and the back cover portion 105 of overcoat cavity 103 Liquid capacity after into being changed of safety injector 100.Cause the locking week in overcoat cavity 103 when promoting core bar 102 The small inclination projection axial constraint inclined-plane 135 for the circumferential projection 134 of locking for crossing core bar 102 to the elastic deformation of projection 112 enters After in the locking circumferential recess 128 of core bar 102, the high inclination-angle groove axial constraint inclined-plane of the locking circumferential recess 128 of core bar 102 129 mutually constrain with the high inclination-angle projection axial constraint inclined-plane 113 for locking circumferential projection 112 in overcoat cavity 103, core bar Two high inclination-angle grooves of 102 locking circumferential recess 134 circumferentially constraint inclined-plane 130 and 131 respectively with overcoat cavity 103 Two high inclination-angle projections of the circumferential projection 112 of locking are circumferentially mutually constrained on constraint inclined-plane 114 and 115, by safety injector 100 Overcoat 101 and core bar 102 lock together, then pinch the taper lip 17 of the flat injection needle 15 away from syringe needle, injection needle 15 is The conehead 106 of the overcoat 101 of safety injector 100 can be departed from, then the injection needle 15 carried disease germs is put into collecting box.

Second of selectable operating process after safety injector 100 extracts liquid is (see Figure 39 to Figure 41)： The circumferential elastic deformation of projection 116 of the positioning in overcoat cavity 103 is caused to cross the chosen of core bar 102 when rotating core bar 102 The groove for positioning circumferential recess 143 circumferentially (is schemed after constraint inclined-plane 144 removes the chosen positioning circumferential recess 143 of core bar 102 36 and Figure 39), the projection of the positioning axial projection 141 of core bar 102 circumferentially hinders determining in overcoat cavity 103 in constraint inclined-plane 142 The circumferential projection 116 in position enters in the positioning circumferential recess 136 of core bar 102, and manipulate core bar 102 can make sealing ring 122 by hand 121 Moved forward and backward in overcoat cavity 103.After safety injector 100 is by use, the cone of the flat injection needle 15 away from syringe needle is pinched Shape lip 17, injection needle 15 can depart from the conehead 106 of the overcoat 101 of safety injector 100, then injection needle 15 is inserted into core (see Figure 40) in the utensil chamber 125 of bar 102, then onto, the sealing ring 122 of core bar 102 is first shifted to the back cover portion of overcoat cavity 103 At 105, core bar 102 is rotated further by so that the circumferential elastic deformation of projection 112 of locking in overcoat cavity 103 crosses the lock of core bar 102 The small inclination projection of tight axial projection 132 circumferentially enters in the locking circumferential recess 128 of core bar 102 on constraint inclined-plane 133, core bar The high inclination-angle groove axial constraint inclined-plane 129 of 102 locking circumferential recess 128 and the circumferential projection of locking in overcoat cavity 103 112 high inclination-angle projection axial constraint inclined-plane 113 is mutually constrained, and two high inclination-angles of the locking circumferential recess 128 of core bar 102 are recessed Circumferentially two high inclination-angle projections of the constraint inclined-plane 130 and 131 respectively with the circumferential projection 112 of locking in overcoat cavity 103 are all for groove Mutually constrained to constraint inclined-plane 114 and 115, by core bar 102 and the injection needle 15 1 being placed into the utensil chamber 125 of core bar 102 Rise and be locked in overcoat 101 (see Figure 39).

During aforesaid operations, the circumferential projection 116 of positioning or the circumferential elasticity of projection 112 of locking in overcoat cavity 103 The working condition of the auditory tone cues safety injector 100 sent during deformation has been changed.

Figure 46 to Figure 54 is the safety injector 150 for representing fourth embodiment of the invention.Safety injector 150 includes Overcoat 151 and core bar 152.Overcoat 151 includes liquid filling bottle 153 and outer cover 154 (see Figure 52).Liquid filling bottle 153 and outer cover 154 have foot Enough transparencies.Liquid filling bottle 153 has the first overcoat cavity 155 (see Figure 50 and Figure 51).First overcoat cavity 155 is respectively front and rear End opening.There is back cover portion 156 front portion of first overcoat cavity 155.Have in the front end in the back cover portion 156 of the first overcoat cavity 155 Conehead 157.There is cone head hole 158 in conehead 157.The insertion of 158 and first overcoat cavity of cone head hole 155.Outer cover 154 has the second overcoat Cavity 159 (see Figure 48 and Figure 49).Second overcoat cavity 159 end opening before and after outer cover 154 respectively.Second overcoat cavity There are the buckle 160, elastic hook 161 and the overcoat crimping 162 stretched out of convex in 159 rear portion.When the second overcoat of outer cover 154 When cavity 159 is wrapped in the periphery of liquid filling bottle 153, the buckle 160 in the second overcoat cavity 159 is hooked in the rear end of liquid filling bottle 153 On edge, liquid filling bottle 153 is locked in the second overcoat cavity 159 of outer cover 154, the conehead 157 of liquid filling bottle 153 is from outer cover 154 Front opening at stretch out (see Figure 52).When the sealing ring 163 of core bar 152 is inserted at the open rearward end of the second overcoat cavity 159 After in first overcoat cavity 155, manipulate core bar 152 can make sealing ring 163 in the first overcoat cavity 155 by hand 164 before and after Mobile, the sealing of the outer wall 165 of sealing ring 163 and the formation safety injector 150 of inwall 166 of the first overcoat cavity 155 is matched somebody with somebody Close.

Injection needle 15 can be plugged on the conehead 157 of the front end in the back cover portion of the first overcoat cavity of liquid filling bottle 153.Outer cover There is the circular cone inclined-plane 167 of greater obliquity at 154 front opening (see Figure 48).When the bellmouth 20 of injection needle 15 is inserted in liquid filling bottle When on 153 conehead 157, injection needle 15 is fixed on the conehead 157 of liquid filling bottle 153.When the taper lip for pinching flat injection needle 15 During side 17, the circular cone inclined-plane 167 at front opening of the taper lip 17 along outer cover 154 is moved, and taper lip 17 promotes injection needle 15 move forward so that the bellmouth 20 of injection needle 15 departs from the conehead 157 of liquid filling bottle 153.

There is the utensil chamber 168 of lateral openings the side of core bar 152 (see Figure 53).Injection needle 15 can be inserted in utensil chamber 168 (see Figure 54).There is intracavitary circumferential recess 169 rear end of utensil chamber 168 (see Figure 53).The intracavitary circumferential recess 169 of utensil chamber 168 Lateral openings at circumferential width be less than injection needle 15 taper lip 17 diameter and the intracavitary circumferential recess of utensil chamber 168 169 diameter.Core bar 152 presses hand 164 positioned at the side of injection needle 15 jagged 170.When injection needle 15 is placed into core bar When in 152 utensil chamber 168, the elastic deformation of taper lip 17 of injection needle 15 crosses the intracavitary circumferential recess 169 of utensil chamber 168 Lateral openings at, into the intracavitary circumferential recess 169 of utensil chamber 168 so that the taper lip 17 of injection needle 15 is restrained In the intracavitary circumferential recess 169 of utensil chamber 168, injection needle 15 is constrained in utensil chamber 168 (see Figure 54).In safety-type note Emitter 150 is by before use, injection needle 15 is placed into the utensil chamber 168 of core bar 152 (see Figure 46).In safety injector 150 By in use, pinching the injection needle being placed into the utensil chamber 168 of core bar 152 at the breach 170 by hand 164 of core bar 152 15 taper lip 17, takes out injection needle 15, then the bellmouth 18 of injection needle 15 is inserted at the lateral openings of utensil chamber 168 On the conehead 157 of overcoat 151 so that injection needle 15 is fixed on the conehead 157 of overcoat 151 (see Figure 47).In safety-type note Emitter 150 is by after use, after the injection needle 15 being inserted on the conehead 157 of overcoat 151 is removed, then by injection needle 15 from utensil chamber 168 lateral openings are disposed in the utensil chamber 168 of core bar 152 (see Figure 46 and Figure 54).

Understand that safety injector of the invention can reach following technique effect according to above-mentioned be discussed in detail：

The safety injector of the present invention, realizing the rear portion of overcoat cavity has outside the circumferential projection of the locking of convex, core bar There is the circumferential projection of the resiliently flexible locking for crossing core bar of the circumferential projection of the locking in locking circumferential recess, overcoat cavity to enter in week Enter in the locking circumferential recess of core bar, the auditory tone cues sent during circumferential projection elastic deformation, core bar are locked in overcoat cavity It has been locked in the injection needle for the utensil intracavitary for being placed into core bar in overcoat.After safety injector use, aspirated for single With the use requirement of injection, it is contemplated that disposable process once completion, automatic start prevent reuse function, will safety The overcoat and core bar of type syringe are locked together, and then pinch the taper lip of the flat injection needle away from syringe needle, and injection needle can take off It is put into from the conehead of the overcoat of safety injector, then by the injection needle carried disease germs in collecting box；For the core bar before single injection The use requirement that can be repeatedly aspirated, it is contemplated that disposable process once completion, pinch the flat injection needle away from syringe needle Taper lip, injection needle can depart from the conehead of the overcoat of safety injector, can both the injection needle carried disease germs be put into receipts In header, the injection needle carried disease germs can also be taken in the utensil intracavitary of the core bar of safety injector, it is then optionally artificial Startup prevents from reusing function, the overcoat and core bar of safety injector is locked together or do not locked together；Reach operation During will not touch the purpose of syringe needle, so as to both the injection needle carried disease germs can be avoided to cause serious injury human body, again It can avoid being reused.

The safety injector of the present invention, realizing the rear portion of overcoat cavity has outside the circumferential projection of the positioning of convex, core bar There are positioning axial projection and multiple positioning circumferential recess along the axial arranged distribution of core bar week.Cause overcoat cavity when rotating core bar The circumferential projection elastic deformation of interior positioning crosses the positioning axial projection of core bar into the chosen positioning circumferential recess of core bar After interior, the chamber formation peace between the front end of the sealing ring for the core bar being constrained in overcoat cavity and the back cover portion of overcoat cavity The selected liquid capacity of holotype syringe；When rotating core bar the circumferential projection elastic deformation of the positioning in overcoat cavity is crossed The positioning circumferential recess of core bar is removed after the positioning circumferential recess of core bar, and manipulate core bar can make sealing ring in overcoat cavity by hand It is interior movable；Reach that the pre-filled medicinal liquid amount of safety injector can be with the purpose of accurate lock.In operation, overcoat is empty The working condition that auditory tone cues safety injector is sent during the positioning circumference projection elastic deformation of intracavitary has been changed.

The safety injector of the present invention, realize by the conehead and circular cone inclined-plane of overcoat and the taper lip of instrument used for injection and Bellmouth constitutes the interface of instrument used for injection.When the bellmouth of injection needle is inserted on the conehead of overcoat, injection needle is fixed on outer On the conehead of set, reach by inject be needled into human body muscle or it is intravascular when avoid the needle point of injection needle from swinging mesh , so as to avoid causing operational error；After safety injector use, it is only necessary to pinch the cone of the flat injection needle away from injection needle Shape lip, injection needle can depart from the conehead of the overcoat of safety injector, can both the injection needle carried disease germs be put into collecting box It is interior, the injection needle carried disease germs can also be taken in the utensil intracavitary of the core bar of safety injector, reach and avoid connecing in operating process The purpose of syringe needle is contacted, so as to avoid the injection needle carried disease germs from injuring human body.

The safety injector of the present invention, realizing the side of core bar has the utensil chamber for inserting injection needle of lateral openings, Core bar presses hand jagged positioned at the side of utensil chamber.In safety injector by before use, injection needle is placed into core bar Utensil intracavitary；In safety injector by use, being placed into the utensil intracavitary of core bar in being pinched by the indentation, there of hand for core bar Instrument used for injection taper lip, at the lateral openings of utensil chamber take out instrument used for injection；After safety injector is by use, After the instrument used for injection being inserted on the conehead of overcoat is removed, then the lateral openings of instrument used for injection from utensil chamber are disposed into core bar Utensil intracavitary, then shifts behind bottom core bar onto most of core bar and enters in overcoat, reaches the safety injector that ultimately forms The less purpose of overall volume, so as to be offered convenience to follow-up destroy.

The safety injector of the present invention, realizes that the part of the safety injector of the present invention is fewer than conventional injector for medical purpose The part of the sheath of one injection needle, the structure of the topping up chamber of safety injector of the invention and conventional injector for medical purpose Identical, safety injector of the invention, which had both reached, to be easy to exclude the gas for filling chamber and is easy to the purpose of assembling, is reached again Production cost to production cost and conventional injector for medical purpose is similar and lower than the production cost of existing safety injector Purpose much.

It will thus be seen that above-mentioned stated target, including by those shown targets described above by effectively Reach.Described here is only the typical optimal form of implementation of the present patent application, can make some changes to said structure Change also without prejudice to the spirit and scope of the present invention.The present invention is not limited to detail set forth herein, and answers It is obvious any to retain as stated in the restriction of claim for art secondary technology personnel Improve or retrofit.

Claims

1. a kind of safety injector, the safety injector includes overcoat and core bar；

It is described it is outer be cased with overcoat cavity, the overcoat cavity end opening before and after overcoat, the front end of the overcoat cavity respectively Have back cover portion, having in the front end in the back cover portion of the overcoat cavity has cone head hole in conehead, the conehead, the cone head hole with it is outer Cavity insertion is covered, has overcoat crimping at the rear portion of overcoat, has volume scale on the outer surface of overcoat；

The rear end of the core bar has by hand, and there is sealing ring front portion；The sealing ring of the core bar is inserted at overcoat cavity open rearward end After entering in overcoat cavity, manipulate the core bar can be such that sealing ring is moved forward and backward in overcoat cavity by hand, the outer wall of sealing ring Sealing with the inwall formation safety injector of overcoat cavity coordinates；

It is characterized in that：There are the circumferential projection of convex, the week on the flexible hook in rear portion of the overcoat cavity, the elastic hook There is projection axial constraint inclined-plane to the axial sides of projection, there is projection circumferentially constraint inclined-plane the circumferential both sides of circumferential projection respectively； There is a circumferential recess periphery of the core bar, the fluted axial constraint inclined-plane of axial sides of the circumferential recess, circumferential recess The circumferential fluted circumferential constraint inclined-plane of both sides difference, the peripheral side of circumferential recess has axial projection, the week of the axial projection There is projection circumferentially constraint inclined-plane to side.

2. safety injector according to claim 1, it is characterized in that, have fixed in the circumferential projection in the overcoat cavity There are projection axial constraint inclined-plane, the week of the circumferential projection of positioning in the circumferential projection in position, the axial both sides of the circumferential projection of the positioning respectively There is projection circumferentially constraint inclined-plane respectively to both sides；There are positioning circumferential recess, multiple positioning in the circumferential recess of the core bar Axial arranged distribution of the circumferential recess along core bar, the axial both sides fluted axial constraint of difference of each positioning circumferential recess is oblique Face, the fluted circumferential constraint inclined-plane of circumferential both sides difference of each positioning circumferential recess, the peripheral side of positioning circumferential recess has Axial projection is positioned, the peripheral side of the positioning axial projection has projection circumferentially constraint inclined-plane；Cause overcoat when rotating core bar The projection for the positioning axial projection that the circumferential projection elastic deformation of positioning in cavity crosses core bar circumferentially enters on constraint inclined-plane After in the chosen positioning circumferential recess of core bar, two grooves of the selected positioning circumferential recess of core bar are circumferential about Two projections of the beam inclined-plane respectively with the circumferential projection of positioning in overcoat cavity are circumferentially mutually constrained on constraint inclined-plane, hinder core Bar is rotated in overcoat cavity, two groove axial constraint inclined-planes of the selected positioning circumferential recess of core bar respectively with Two projection axial constraint inclined-planes of the circumferential projection of positioning in overcoat cavity are mutually constrained, and hinder the sealing of core bar Circle is moved forward and backward in overcoat cavity, and the front end of the sealing ring for the core bar being constrained in overcoat cavity is described with overcoat cavity Chamber between back cover portion forms the selected liquid capacity of the safety injector；Cause when rotating core bar in overcoat cavity The circumferential projection elastic deformation of positioning cross core bar positioning circumferential recess the circumferential constraint inclined-plane removal core bar of groove positioning After circumferential recess, circumferentially constraint inclined-plane hinders the circumferential projection of the positioning in overcoat cavity to enter to the projection of the positioning axial projection of core bar Enter in the positioning circumferential recess of core bar, manipulating the described of core bar can be such that sealing ring is moved forward and backward in overcoat cavity by hand.

3. safety injector according to claim 2, it is characterized in that, the axle of the circumferential projection of positioning of the overcoat cavity There is small inclination projection axial constraint inclined-plane respectively to both sides；When the circumferential projection of positioning in overcoat cavity is located at the quilt of the core bar When in selected positioning circumferential recess, two groove axial constraint inclined-planes point of the chosen positioning circumferential recess of core bar Two projection axial constraint inclined-planes not with the circumferential projection of positioning in overcoat cavity are mutually constrained, and hinder the described of core bar Sealing ring is moved forward and backward in overcoat cavity, front end and the overcoat cavity of the sealing ring for the core bar being constrained in overcoat cavity The selected liquid capacity of the safety injector is formed between the back cover portion；Cause when promoting core bar in overcoat cavity The small inclination projection axial constraint inclined-plane elastic deformation of the circumferential projection of positioning crosses the chosen positioning week of the core bar After entering to the groove axial constraint inclined-plane of groove in another positioning circumferential recess, another positioning circumferential recess of core bar Two groove axial constraint inclined-planes two projection axial constraint inclined-plane phases respectively with the circumferential projection of positioning in overcoat cavity Mutually constraint, hinders the sealing ring of core bar to be moved forward and backward in overcoat cavity, the sealing ring for the core bar being constrained in overcoat cavity Front end and overcoat cavity back cover portion between chamber formation being changed of safety injector after liquid capacity.

4. safety injector according to claim 2, it is characterized in that, the axial direction two of the positioning circumferential recess of the core bar There is small inclination groove axial constraint inclined-plane side respectively；When the circumferential projection of positioning in the overcoat cavity is located at the chosen of core bar Positioning circumferential recess in when, two groove axial constraint inclined-planes of the chosen positioning circumferential recess of core bar respectively with Two projection axial constraint inclined-planes of the circumferential projection of positioning in overcoat cavity are mutually constrained, and hinder the sealing of core bar Circle is moved forward and backward in overcoat cavity, and the front end of the sealing ring for the core bar being constrained in overcoat cavity is described with overcoat cavity The selected liquid capacity of the safety injector is formed between back cover portion；Cause the positioning in overcoat cavity when promoting core bar The small inclination groove axial constraint inclined-plane that circumferential projection elastic deformation crosses the chosen positioning circumferential recess of core bar enters After entering in another positioning circumferential recess, two groove axial constraint inclined-planes difference of another positioning circumferential recess of core bar Mutually constrained with two projection axial constraint inclined-planes of the circumferential projection of positioning in overcoat cavity, hinder the sealing ring of core bar outside Cover in cavity and move forward and backward, between the front end of the sealing ring for the core bar being constrained in overcoat cavity and the back cover portion of overcoat cavity Chamber formation being changed of safety injector after liquid capacity.

5. safety injector according to claim 1, it is characterized in that, there is lock in the circumferential projection in the overcoat cavity Tight circumference projection, the circumferential projection of the locking has projection axial constraint inclined-plane, and the circumferential both sides of the circumferential projection of locking have convex respectively Block circumferentially constrains inclined-plane；There is locking circumferential recess in the circumferential recess of the core bar, the axial direction of the locking circumferential recess has recessed Groove axial constraint inclined-plane, the fluted circumferential constraint inclined-plane of circumferential both sides difference of locking circumferential recess, locks the week of circumferential recess There is locking axial projection to side；The circumferential projection elastic deformation of the locking in overcoat cavity is caused to cross core bar when rotating core bar After the locking axial projection enters in the locking circumferential recess of core bar, the groove axial direction of the locking circumferential recess of core bar is about The projection axial constraint inclined-plane on beam inclined-plane and the circumferential projection of locking in overcoat cavity is mutually constrained, and the locking of core bar is circumferential Circumferentially two projections of the constraint inclined-plane respectively with the circumferential projection of locking in overcoat cavity are all for two grooves of groove Mutually constrained to constraint inclined-plane so that core bar is locked on overcoat cavity.

6. safety injector according to claim 1, it is characterized in that, there is lock in the circumferential projection in the overcoat cavity Tight circumference projection, the circumferential projection of the locking has projection axial constraint inclined-plane, and the circumferential both sides of the circumferential projection of locking have convex respectively Block circumferentially constrains inclined-plane；There is locking circumferential recess in the circumferential recess of the core bar, the axial direction of the locking circumferential recess has recessed Groove axial constraint inclined-plane, the fluted circumferential constraint inclined-plane of circumferential both sides difference of locking circumferential recess, locks the axle of circumferential recess There is the circumferential projection of locking to side；The circumferential projection elastic deformation of the locking in overcoat cavity is caused to cross core bar when promoting core bar After the circumferential projection of locking enters in the locking circumferential recess of core bar, the groove axial constraint of the locking circumferential recess of core bar is oblique Face and the projection axial constraint inclined-plane of the circumferential projection of locking in overcoat cavity are mutually constrained, the locking circumferential recess of core bar Two grooves circumferentially two projections of the constraint inclined-planes respectively with the circumferential projection of locking in overcoat cavity are circumferential about Beam inclined-plane is mutually constrained so that core bar is locked on overcoat cavity.

7. safety injector according to claim 1, it is characterized in that, before the back cover portion of the overcoat cavity of the overcoat The instruments used for injection such as injection needle, fog-spray nozzle or conehead cap can be plugged on the conehead at end, there is cone inclined the rear end of the conehead of the overcoat There are taper lip and bellmouth in face, the rear portion of the instrument used for injection, and the taper lip of instrument used for injection is located at the bellmouth Rear portion；When the bellmouth of instrument used for injection is inserted on the conehead of overcoat, instrument used for injection is fixed on the conehead of overcoat；When pinching During the taper lip of flat instrument used for injection, the circular cone inclined-plane of the rear end of conehead of the taper lip along set is moved, so that taper lip is pushed away Dynamic instrument used for injection is moved forward so that the bellmouth of instrument used for injection departs from the conehead of overcoat.

8. safety injector according to claim 7, it is characterized in that, there is the utensil of lateral openings the side of the core bar Chamber, the core bar presses hand jagged positioned at the side of the utensil chamber, and there is intracavitary circumferential recess the rear end of the utensil chamber, Circumferential width at the lateral openings of the intracavitary circumferential recess of utensil chamber is less than the straight of the taper lip of the instrument used for injection The diameter of the intracavitary circumferential recess of footpath and utensil chamber；When injection needle or the first-class instrument used for injection of spraying are placed into the utensil intracavitary of core bar When, the taper lip elastic deformation of instrument used for injection is crossed at the lateral openings of intracavitary circumferential recess of utensil chamber, into utensil chamber Intracavitary circumferential recess in so that the taper lip of instrument used for injection is constrained in the intracavitary circumferential recess of utensil chamber, will be injected Utensil constrains in utensil intracavitary；In safety injector by use, being placed into being pinched by the indentation, there of hand for core bar The taper lip of the instrument used for injection of the utensil intracavitary of core bar, takes out instrument used for injection at the lateral openings of utensil chamber, The bellmouth of instrument used for injection is inserted on the conehead of the overcoat again so that instrument used for injection is fixed on the conehead of overcoat On；After safety injector is by use, after the instrument used for injection being inserted on the conehead of overcoat is removed, then by injection needle or spraying The lateral openings of first-class instrument used for injection from utensil chamber dispose the utensil intracavitary into core bar.

9. safety injector according to claim 1, it is characterized in that, the overcoat includes liquid filling bottle and outer cover；It is described Liquid filling bottle has the first overcoat cavity, and the first overcoat cavity is respectively in front and rear end opening, and there is envelope the front portion of the first overcoat cavity Bottom, having in the front end in the back cover portion of the first overcoat cavity has cone head hole in conehead, the conehead, the cone head hole and One overcoat cavity insertion；It is described to be covered with the second overcoat cavity, the second overcoat cavity end opening before and after outer cover respectively, There are the buckle, the elastic hook and the overcoat crimping stretched out of convex in the rear portion of second overcoat cavity；When outside the second of outer cover Set cavity is when being wrapped in the periphery of liquid filling bottle, the back edge of the snap hook of the second overcoat cavity of outer cover in liquid filling bottle On, liquid filling bottle is locked in the second overcoat cavity of outer cover, the conehead of liquid filling bottle stretches out at the front opening of outer cover；When described After the sealing ring of core bar is inserted in the first overcoat cavity at the second overcoat cavity open rearward end, the hand of pressing for manipulating the core bar can Sealing ring is set to be moved forward and backward in the first overcoat cavity, the inwall of the outer wall of sealing ring and the first overcoat cavity forms the safety The sealing of type syringe coordinates.

10. safety injector according to claim 9, it is characterized in that, the envelope of the first overcoat cavity of the liquid filling bottle The instruments used for injection such as injection needle, fog-spray nozzle or conehead cap can be plugged on the conehead of the front end of bottom, the front end of the outer cover is opened There is the circular cone inclined-plane of high inclination-angle at mouthful；When the bellmouth of the instrument used for injection is inserted on the conehead of liquid filling bottle, instrument used for injection quilt It is fixed on the conehead of liquid filling bottle；When pinching the taper lip of the flat instrument used for injection, front opening of the taper lip along outer cover The circular cone inclined-plane movement at place, taper lip pushing syringe tool is moved forward so that the bellmouth of instrument used for injection departs from liquid filling bottle Conehead.