CN205007385U - Disposable safe insulin injection needle - Google Patents

Abstract

Disposable safe insulin injection needle, including needle body, needle file, the main casing body, oversheath and trigger tube, the characteristic is: the needle file comprises with seat pole fixed connection the seat dish, seat dish outer fringe and the internal reason of main casing have slide orientation's relation of connection, utilize the axial thrust of insulin nib portion to make the seat dish move to second location position from first location position when installing injection needle promptly, on the present pole of trigger tube rear portion cover, front end top is leaned on in the oversheath front portion on the terminal surface, be equipped with the 3rd location structure between trigger tube and the seat pole, when the relative seat pole of trigger tube is in third location position, the relative main casing of the seat dish body is in on the first location position, when seat dish moved to second location position in the internal follow of main casing first location position, the trigger tube was removed the third location and is formed sliding connection with a seat pole. The utility model discloses whether the unblock is got up with the state relevance whether insulin pen and injection needle get ready to inject after fixing a position the trigger tube, has improved the security and the convenience that use.

Description

Disposable safe injection of insulin syringe needle

Technical field

This utility model relates to medical injection of insulin instrument, particularly the disposable safe injection of insulin syringe needle of one.This injection needle and novopen support the use and can be used for automedication or other people administration, and wherein novopen is reusable, and injection needle is single use syringe needle.

Background technology

The metabolic disease of diabetes to be a kind of with hyperglycemia be feature, there is no the method for radical cure at present, but gives patient's insulin injection can effective symptom management.

The injection tool of insulin is varied; wherein injection of insulin syringe needle described in the utility model is a kind of and the matching used injection tool of novopen; wherein novopen carries the insulin fluid medicine of ormal weight; reusable, and injection needle is a kind of single use syringe needle with safety guard.

Chinese patent CN101563124A discloses the application for a patent for invention that a kind of name is called " needle protection with distally and proximal needle protector "; US Patent No. 2011/0288491A1 discloses the application for a patent for invention that a kind of name is called " safety needle assembly ".These two patent applications all relate to injection of insulin syringe needle, and its basic structure includes:

1. for the needle body of insulin injection and the needle stand of fixing needle body;

2. be used for the main casing be connected with novopen;

3. the sleeve pipe of safety before and after using for the protection of needle body;

4. for the spring of mobile sleeve pipe;

5., for the protection of the oversheath of injection needle entirety, this oversheath does not embody in the accompanying drawing of above-mentioned two pieces patent, but can see in actual product, and indispensable under normal circumstances.

In above-mentioned existing injection needle, needle body is fixed on needle stand, the injection portion of needle body is stretched out from needle stand front end, the linkage section of needle body stretches out from needle stand rear end, but the relative main casing of needle stand is the relation of being fixedly connected with, the advantage of this design is that structure is simple, and this utility model improves from another angle its annexation, to embody safety and the convenience of injection needle use.

Summary of the invention

In view of the problem that above prior art is pointed out, this utility model provides a kind of disposable safe injection of insulin syringe needle, its objective is the safety during will solve above-mentioned prior art uses and convenience issue.

For achieving the above object, the technical solution adopted in the utility model is: a kind of disposable safe injection of insulin syringe needle, comprising:

Needle body, this needle body has the injection portion of a forward end direction extension, the linkage section of a direction extension to the back-end and a canned paragraph between injection portion and linkage section;

Needle stand, this needle stand is used for fixing needle body, and the canned paragraph of described needle body is fixed on needle stand, and the injection portion of needle body is stretched out from needle stand front end, and the linkage section of needle body stretches out from needle stand rear end;

Main casing, this main casing is tube structure, and needle stand and needle body are positioned at main casing (3) in the assembled condition, and the rear end of main casing is for connecting novopen;

Trigger tube, the agent structure of this trigger tube is body, and under confined state, trigger tube is positioned at main casing front end and extends to outside front end before use, for the protection of the injection portion of needle body;

Its innovation is:

Described needle stand is made up of attic base and seat bar, and seat bar is positioned at attic base front end and is fixedly connected with attic base; The outer rim of attic base matches with the inner edge of main casing, corresponding attic base outer rim is interval with the first position location and the second position location vertically on main casing inner edge, be installed in the process of described novopen at described injection needle, utilize novopen head to force attic base to move forward to the second position location vertically from the first position location in main casing to the axial thrust that needle stand produces, thus make the annexation forming location of sliding between needle stand and main casing; On the first position location, the outer rim of attic base is coordinated by the first location structure with the inner edge of main casing, and on the second position location, the outer rim of attic base is coordinated by the second location structure with the inner edge of main casing; Described first location structure adopts concavo-convex location structure, elastic positioning structure or friction location structure; Described second location structure adopts concavo-convex location structure, elastic positioning structure, friction location structure, card lock bit architecture or end face against location structure;

Described trigger tube is provided with relative to main casing move forward spacing, and the rear sleeve of trigger tube is contained on the seat bar of needle stand; Between trigger tube body and seat bar, side is provided with recess, and opposite side is provided with protuberance, and recess is stuck on protuberance and forms the 3rd location, and when the relative seat bar of trigger tube is in the 3rd position location, the relative main casing of the attic base on needle stand is on the first position location; When attic base moves forward to the second position location vertically from the first position location in main casing, trigger tube and seat bar are removed the 3rd and are located, and formation is slidably connected.

Related content in technique scheme is explained as follows:

1., in this utility model, " front " in described " front end ", " forward ", " front and back ", " front portion ", " front ", " front end face " refers to the direction of this utility model disposable safe type injection of insulin syringe needle injection portion needle point indication." afterwards " in described " rear end ", " front and back ", " backward ", " rear portion ", " rear " refers to the opposite direction of " front ".

2. in such scheme, be provided with oversheath outside described main casing, this oversheath is tube-in-tube structure, and under confined state, oversheath is sleeved on outside main casing before use, overall for the protection of described injection needle; Described trigger tube be provided with relative to main casing the spacing front end by trigger tube that moves forward close to or lean and formed on the inner front end face of oversheath.

3., in such scheme, described concavo-convex location structure to be coordinated with the convex tendon be located on main casing inner edge by the chase being located at attic base outer marginal circumference direction and is formed.

4., in such scheme, described elastic positioning structure is coordinated by elasticity pearl pin is formed with depression, elasticity pearl pin with cave in both in, one is located in attic base outer rim, and another one is located on main casing inner edge.

5., in such scheme, described friction location structure is formed by attic base outer rim and main casing inner edge frictional fit.

6., in such scheme, described card lock bit architecture to be coordinated with draw-in groove set on main casing inner edge by attic base outer rim and side end face, front and back and is formed.

7., in such scheme, described end face is formed against coordinating with the inner face of main casing inner edge against location structure by the anterior end surface of attic base outer rim.

8. in such scheme, described main casing cylinder lateral wall is provided with bayonet socket, bayonet socket is axially positioned on the second position location at main casing, this bayonet socket is a through hole running through between main casing inside and outside wall, to being provided with fixture block by through hole on oversheath sleeve lining, under oversheath suit main casing state, fixture block snaps in bayonet socket and stretches in main casing, oversheath is locked with main casing and is connected; When attic base moves to the second position location from the first position location, fixture block on attic base outer rim jack-up oversheath, makes oversheath deform, and finally causes fixture block and bayonet socket to be threaded off, thus realize oversheath and main casing unlocks, allow in this case to extract oversheath.

9. in such scheme, thread off unlock to be conducive to oversheath and main casing, on the sleeve lining of oversheath, inwardly outstanding rib can be provided with vertically, when oversheath is sleeved on the outer rear flank of main casing, between oversheath inwall and main casing outer wall, leave the gap deformed for oversheath.

10. in such scheme, fixture block conveniently on oversheath departs from the bayonet socket on main casing, can be provided with the chute that forward end direction extends at the bayonet socket place of main casing, to be conducive to fixture block and bayonet socket departs from.

This utility model design principle and effect are: this utility model relates to a kind of needs and novopen matching used disposable safe type injection of insulin syringe needle, and its technical conceive is:

First, the 3rd location structure formed by concaveconvex structure is provided with between trigger tube body and seat bar, to solve before using and the integrity problem of trigger tube protection needle body injection portion in using, ensure trigger tube before use with use in security implementation available protecting to needle body injection portion;

Second, the annexation of locating of sliding is designed to by being used for fixing between the needle stand of needle body and main casing, namely stop after utilizing the axial thrust of novopen head to needle stand to force the attic base on needle stand to move forward to the second position location from the first position location when installing injection needle, thus the information whether be in place by injection needle associates with the shift position of the attic base on needle stand in main casing;

3rd, whether the information whether be in place by injection needle is unlocked after being located with trigger tube by the shift position of attic base in main casing associates, whether unlock the state relation whether being ready to novopen and injection needle inject behind trigger tube location the most at last, thus substantially increase safety and the convenience of injection needle use.

In a word, this utility model Appropriate application installs the axial thrust of injection needle and position makes trigger tube reach the object of automatic unlocking.Its technical conceive is ingenious, and design is reasonable, has outstanding substantive distinguishing features and significant technological progress, has fully demonstrated safety and the convenience of injection needle use.

Accompanying drawing explanation

Accompanying drawing 1 is the axonometric chart of this utility model embodiment disposable safe injection of insulin syringe needle;

Accompanying drawing 2 is the three-dimensional exploded view of this utility model embodiment disposable safe injection of insulin syringe needle;

Accompanying drawing 3 is the axonometric chart of this utility model embodiment tail-hood;

Accompanying drawing 4 is the axonometric chart of this utility model embodiment needle stand and needle body;

Accompanying drawing 5 is the axonometric chart of this utility model embodiment main casing band partial cutaway;

Accompanying drawing 6 is the axonometric chart of this utility model embodiment anterior cannula;

Accompanying drawing 7 is the axonometric chart of this utility model embodiment protheca pipe racks partial cutaway;

Accompanying drawing 8 is the axonometric chart of this utility model embodiment trigger tube;

Accompanying drawing 9 is the axonometric chart of this utility model embodiment triggering pipe racks partial cutaway;

Accompanying drawing 10 is the axonometric chart of this utility model embodiment oversheath band partial cutaway;

Accompanying drawing 11 is the end view of the disposable safe injection of insulin syringe needle of this utility model example belt A-A cross-sectional indicator;

Accompanying drawing 12 is the end view of the disposable safe injection of insulin syringe needle of this utility model example belt B-B cross-sectional indicator;

Accompanying drawing 13 is the end view of the disposable safe injection of insulin syringe needle of this utility model example belt C-C cross-sectional indicator;

Accompanying drawing 14 is the A-A sectional view under state before the use of this utility model embodiment;

Accompanying drawing 15 is the C-C sectional view under state before the use of this utility model embodiment;

Accompanying drawing 16 is for concealing the A-A sectional view after tail-hood under state before the use of this utility model embodiment;

Accompanying drawing 17 is A-A sectional view when this utility model embodiment uses the first stage novopen to be screwed in injection needle;

Accompanying drawing 18 is A-A sectional view during this utility model embodiment use second stage novopen continuation screw-in injection needle;

Accompanying drawing 19 is A-A sectional view during this utility model embodiment use phase III novopen continuation screw-in injection needle;

Accompanying drawing 20 is B-B sectional view during this utility model embodiment use phase III novopen continuation screw-in injection needle;

Accompanying drawing 21 is C-C sectional view during this utility model embodiment use fourth stage novopen continuation screw-in injection needle;

Accompanying drawing 22 is A-A sectional view during this utility model embodiment use fourth stage novopen continuation screw-in injection needle;

Accompanying drawing 23 is B-B sectional view during this utility model embodiment use fourth stage novopen continuation screw-in injection needle;

Accompanying drawing 24 for this utility model embodiment use five-stage extract oversheath time axonometric chart;

Accompanying drawing 25 for this utility model embodiment use five-stage extract oversheath time A-A sectional view;

The A-A sectional view that accompanying drawing 26 uses the 6th stage needle body to start when thrusting human body skin for this utility model embodiment;

Accompanying drawing 27 is A-A sectional view when this utility model embodiment uses the 7th stage needle body to thrust human body skin;

Accompanying drawing 28 for this utility model embodiment use the 8th stage needle body thrust human body skin completely and insulin injection time A-A sectional view;

Accompanying drawing 29 is A-A sectional view when this utility model embodiment uses the complete insulin needle body of the 9th stage injection to extract rear from skin;

Accompanying drawing 30 is B-B sectional view when this utility model embodiment uses the complete insulin needle body of the 9th stage injection to extract rear from skin;

Accompanying drawing 31 is A-A sectional view during this utility model embodiment use the tenth stage novopen back-out injection needle;

Accompanying drawing 32 is the A-A sectional view under state after the use of this utility model embodiment;

Accompanying drawing 33 for this utility model anterior cannula be display " chuck " axonometric chart;

Accompanying drawing 34 for this utility model trigger tube be display " gear platform " axonometric chart;

Accompanying drawing 35 is the B-B sectional view that display " chuck " coordinates with " gear platform ";

Accompanying drawing 36 is the axonometric chart of another embodiment injection of insulin syringe needle of this utility model;

Accompanying drawing 37 is the axonometric chart of needle stand in another embodiment of this utility model;

Accompanying drawing 38 is the A-A sectional view before another embodiment of this utility model uses under state;

Accompanying drawing 39 is the B-B sectional view before another embodiment of this utility model uses under state;

Accompanying drawing 40 is A-A sectional view when extracing oversheath during another embodiment of this utility model uses;

Accompanying drawing 41 is B-B sectional view when extracing oversheath during another embodiment of this utility model uses;

Accompanying drawing 42 is the A-A sectional view after another embodiment of this utility model uses under state;

Accompanying drawing 43 is the B-B sectional view after another embodiment of this utility model uses under state.

In above accompanying drawing:

1. tail-hood; 11. haptic element hooks; 12. inclined-planes; 13. blocks; 14. wedge angle trips; 15. blocks; 16. forelegs; 17. resigning holes;

2. needle stand; 21. chases; 22. protuberances; 23. attic bases; 24. bars; 25. slots to make way;

3. main casing; 31. first trip steps; 32. evade groove; 33. convex tendons; 34. draw-in grooves; 35. second trip steps; 36. anti-back slots; 37. the 3rd trip steps; 38. bayonet sockets; 39. chutes;

4. anterior cannula; 41. elastic latch; 42. is protruding; 43. elasticity empennages; 44. inner faces; 45. inclined planes; 46. chuck;

5. trigger tube; 51. recesses; 52. plugs; 53. gear platforms;

6. needle body;

7. spring;

8. oversheath; 81. fixture blocks; 82. ribs.

Detailed description of the invention

Below in conjunction with drawings and Examples, this utility model is further described:

Embodiment 1: disposable safe injection of insulin syringe needle (protection of band forward tip and the protection of rear end needle point)

As Figure 1-10 shows, this injection needle is shown in Fig. 2 by needle body 6, needle stand 2, main casing 3, oversheath 8, tail-hood 1, anterior cannula 4, trigger tube 5 and spring 7().

Each component structural of the present embodiment disposable safe injection of insulin syringe needle is described below successively:

1. needle body 6

Described needle body 6 be one for insulin injection bobbin, this needle body 6 has injection portion that forward end direction extends, the linkage section that extends of direction and the canned paragraph between injection portion and linkage section to the back-end.

2. needle stand 2

Described needle stand 2 is shown in Fig. 4 for fixing needle body 6(), the canned paragraph of needle body 6 is fixed on needle stand 2, and the injection portion of needle body 6 is stretched out from needle stand 2 front end, and the linkage section of needle body 6 stretches out from needle stand 2 rear end.Needle stand 2 is made up of attic base 23 and seat bar 24, and seat bar 24 is positioned at attic base 23 front end and is fixedly connected with attic base 23, and seat bar 24 is provided with protuberance 22, and attic base 23 is provided with two slots to make way 25, and attic base 23 outer marginal circumference direction is provided with chase 21.

3. main casing 3

Described main casing 3 is used to hold other parts housing (see figure 5)s except except oversheath 8.Main casing 3 is tube structure, and the parts such as needle stand 2 and needle body 6 are positioned at main casing 3 in the assembled condition.The first trip step 31 is provided with in the middle part of main casing 3 cylinder inboard wall, main casing 3 cylinder inboard wall front end is provided with the second trip step 35, main casing 3 cylinder inboard wall rear portion is provided with the 3rd trip step 37, main casing 3 cylinder inboard wall front portion is provided with anti-back slot 36, main casing 3 cylinder inboard wall front portion is also provided with evades groove 32, main casing 3 inner edge is provided with convex tendon 33 and draw-in groove 34, convex tendon 33 is positioned at the first position location of main casing 3 axis, draw-in groove 34 is positioned at the second position location of main casing 3 axis, if with main casing 3 rear end for benchmark, the distance of the first position location to main casing 3 rear end is less than the distance of the second position location to main casing 3 rear end.Main casing 3 cylinder lateral wall is provided with bayonet socket 38, bayonet socket 38 is axially positioned on the second position location at main casing 3, this bayonet socket 38 is a through hole running through between main casing 3 inside and outside wall, and the chute 39(that bayonet socket 38 place is provided with the extension of forward end direction departs from bayonet socket 38 to be conducive to fixture block 81).The rear end of main casing 3 is for connecting novopen, and its syndeton can adopt thread connecting mode, also can adopt plug connected mode, and plug can also be adopted to rotate snap fit etc.In the present embodiment, what Fig. 5 main casing 3 showed is thread connecting mode.

4. oversheath 8

Described oversheath 8 is for the protection of the overall (see figure 10) of described injection needle.This oversheath 8 is tube-in-tube structure, and under confined state, oversheath 8 is sleeved on outside main casing 3 before use.Oversheath 8 sleeve lining is provided with fixture block 81, and the bayonet socket 38 of fixture block 81 in position on corresponding main casing 3 cylinder lateral wall, is set with fixture block 81 under main casing 3 state at oversheath 8 and snaps in bayonet socket 38 and stretch in main casing 3, oversheath 8 is locked with main casing 3 and is connected.The sleeve lining of oversheath 8 is provided with vertically inwardly outstanding rib 82, when oversheath 8 is sleeved on the outer rear flank of main casing 3, between oversheath 8 inwall and main casing 3 outer wall, leaves the gap deformed for oversheath 8.

5. tail-hood 1

Described tail-hood 1 is for the protection of the linkage section (see figure 3) of needle body 6.Tail-hood 1 is made up of a block 15 and two forelegs 16, block 15 is end cap or ring bodies, the central authorities of block 15 be provided with only intert for needle body 6 linkage section allow pin hole 17, allow pin hole 17 axis and main casing 3 axis being parallel, two forelegs 16 are fixedly connected on block 15 front end, and to allow pin hole 17 axis arrange for reference symmetry, the inner side of each foreleg 16 is provided with inclined-plane 12 on root position, medium position is provided with the block 13 extended internally, terminal position is provided with haptic element hook 11; The outside of each foreleg 16 is provided with wedge angle trip 14 on medium position.

6. anterior cannula 4

Described anterior cannula 4 is for the protection of the injection portion (see Fig. 6 and Fig. 7) using rear needle body 6.The agent structure of anterior cannula 4 is body, and the leading inside of anterior cannula 4 is provided with inner face 44; The rear end of anterior cannula 4 is provided with the elastic latch 41 extended back and the elasticity empennage 43 extended back, and elastic latch 41 and elasticity empennage 43 are staggeredly arranged in anterior cannula 4 circumference; Be provided with outward extending protruding 42 outside the middle part of anterior cannula 4, projection 42 and elastic latch 41 are in anterior cannula 4 circumferential position correspondence, and protruding 42 are provided with inclined plane 45 by elastic latch 41 side.

7. trigger tube 5

Described trigger tube 5 is for the protection of the injection portion (see Fig. 8 and Fig. 9) using front needle body 6.The agent structure of trigger tube 5 is body, and the rear end of trigger tube 5 is provided with two plugs 52 extended back, and plug 52 is provided with barb, is located at recess 51 in trigger tube 5 body.

8. spring 7

Described spring 7 is for pushing anterior cannula 4 and tail-hood 1.

Structure, annexation and position relationship for solving required for this utility model technical problem is described below:

1. architectural feature

The 3rd location structure formed by concaveconvex structure is provided with between trigger tube 5 body and seat bar 24.Namely between trigger tube 5 body and seat bar 24, side is provided with recess 51, and opposite side is provided with protuberance 22, and recess 51 is stuck on protuberance 22 and forms the 3rd location.

In a word, this architectural feature solve solve use before and in using trigger tube 5 protect the integrity problem of needle body 6 injection portion, ensure trigger tube 5 before use with use in security implementation available protecting to needle body 6 injection portion.

2. annexation feature

The annexation of locating of sliding is designed to by being used for fixing between the needle stand 2 of needle body 6 and main casing 3.Namely on needle stand 2, the outer rim of attic base 23 matches with the inner edge of main casing 3, corresponding attic base 23 outer rim is interval with the first position location and the second position location vertically on main casing 3 inner edge, be installed in the process of described novopen at described injection needle, utilize novopen head to force attic base 23 to move forward to the second position location vertically from the first position location in main casing 3 to the axial thrust that needle stand 2 produces, thus make between needle stand 2 and main casing 3, to form the annexation of sliding and locating.

On the first position location, the outer rim of attic base 23 is coordinated by the first location structure with the inner edge of main casing 3, and on the second position location, the outer rim of attic base 23 is coordinated by the second location structure with the inner edge of main casing 3.Described first location structure is concavo-convex location structure, and this concavo-convex location structure specifically to be coordinated with the convex tendon 33 be located on main casing 3 inner edge by the chase 21 being located at attic base 23 outer marginal circumference direction and formed.Described second location structure is card lock bit architecture, and this card lock bit architecture specifically to be coordinated with draw-in groove 34 set on main casing 3 inner edge by attic base 23 outer rim and side end face, front and back and formed.

In a word, this annexation feature object stops after the axial thrust of novopen head to needle stand 2 will being utilized to force the attic base 23 on needle stand 2 to move forward to the second position location from the first position location when installing injection needle, thus the information whether be in place by injection needle associates with the shift position of attic base 23 in main casing 3 on needle stand 2.

3. position relationship feature

Correspondence position relation is set up in 3rd position location and the first position location.When trigger tube 5 relative bars 24 are in the 3rd position location, the attic base 23 on needle stand 2 relatively main casing 3 is on the first position location; When attic base 23 moves forward to the second position location vertically from the first position location in main casing 3, the 3rd location removed by trigger tube 5 and seat bar 24, and formation is slidably connected.

In a word, whether the information whether injection needle is in place by this position relationship feature is unlocked after being located with trigger tube by the shift position of attic base in main casing associates, whether unlock the state relation whether being ready to novopen and injection needle inject behind trigger tube location the most at last, thus substantially increase safety and the convenience of injection needle use.

The present embodiment disposable safe injection of insulin syringe needle before use under confined state the annexation of each parts and position relationship be described below:

As illustrated in figures 14-16, before use under confined state, oversheath 8 is sleeved on outside main casing 3, and the fixture block 81 on oversheath 8 snaps in the bayonet socket 38 of main casing 3 and stretches in main casing 3, oversheath 8 is locked with main casing 3 and is connected; Needle stand 2 and needle body 6 are positioned at main casing 3, attic base 23 on needle stand 2 is in the first position location in main casing 3, and on the first position location, the chase 21 in attic base 23 outer marginal circumference direction coordinates with the convex tendon 33 on main casing 3 inner edge and forms concavo-convex location structure (see Figure 15); Tail-hood 1 is positioned at main casing 3 rear end, block 15 on tail-hood 1 is positioned at the linkage section (see Figure 14 and Figure 15) of attic base 23 rear for the protection of needle body 6, and two forelegs 16 on tail-hood 1 stretch to front (see Figure 14 and Figure 15) through two slots to make way 25 on attic base 23; Described anterior cannula 4 is positioned at main casing 3, elastic latch 41 in anterior cannula 4 is stuck on the first trip step 31 on main casing 3, restriction anterior cannula 4 relatively main casing 3 travels forward (see Figure 16), and the haptic element hook 11 simultaneously on tail-hood 1 two forelegs 16 hooks in the elastic latch 41 of anterior cannula 4 (see Figure 14); Described trigger tube 5 is positioned at main casing 3 front end and extends to outside front end, for the protection of the injection portion (see Figure 14) of needle body 6, the rear sleeve of trigger tube 5 is contained on the seat bar 24 of needle stand 2, the rear portion of trigger tube 5 is positioned at anterior cannula 4, the front end of trigger tube 5 close to or lean on the inner front end face of oversheath 8, the protuberance 22 that the recess 51 on trigger tube 5 is stuck in a bar 24 forms location (see Figure 15 and Figure 16); Described spring 7 one end is resisted against on the block 13 of tail-hood 1 two forelegs 16, and the other end is resisted against (see Figure 14) on the inner face 44 of anterior cannula 4.

The use procedure of the present embodiment disposable safe injection of insulin syringe needle is described below:

First stage:

Figure 17 represents the state of first stage.As can be seen from Figure 17, in this case, novopen head is screwed in injection needle described in the present embodiment by user.The head of novopen promotes tail-hood 1 and moves forward, and the arrow in Figure 17 represents the thrust that novopen head produces, and the haptic element hook 11 of tail-hood 1 is by inclined plane 45 jack-up in anterior cannula 4 projection 42 simultaneously.

Second stage:

Figure 18 represents the state of second stage.As can be seen from Figure 18, in this case, novopen continues to screw in injection needle, and anterior cannula 4 projection 42 crossed by the haptic element hook 11 of tail-hood 1, and the elastic latch 41 that the inclined-plane 12 of tail-hood 1 is oppressed in anterior cannula 4 simultaneously curves inwardly.

Phase III:

Figure 19 and Figure 20 represents the state of phase III.In this case, novopen continues to screw in injection needle, elastic latch 41 continues to curve inwardly, finally force elastic latch 41 and the first trip step 31 to break off relations and fall into and evade groove 32, relieve anterior cannula 4 proal spacing in main casing 3, now under the promotion of spring 7, anterior cannula 4 moves forward, until protruding 42 are tackled by haptic element hook 11 and stop moving and travelling forward to anterior cannula 4 carrying out spacing (see Figure 19).As can be seen from Figure 20, in this case, the fixture block 81 on oversheath 8 snaps in the bayonet socket 38 of main casing 3 and stretches in main casing 3, and the attic base 23 on needle stand 2 is still in the first position location, and tail-hood 1 contacts the attic base 23 on needle stand 2 gradually.

Fourth stage:

Figure 21, Figure 22 and Figure 23 represent the state of fourth stage.In this case, novopen continues to screw in injection needle, block 15 on tail-hood 1 against needle stand 2 attic base 23 and promote attic base 23 and move forward to the second position location (see Figure 21) from the first position location, coordinate in the draw-in groove 34 that attic base 23 outer rim and side end face, front and back snap on main casing 3 inner edge on the second position location and form card lock bit architecture, attic base 23 is locked on the second position location, can not continue forward mobile, can not move backward.In this case, because trigger tube 5 front end leans on the inner front end face of oversheath 8, when needle stand 2 moves forward, the protuberance 22 on needle stand 2 and the location between the recess 51 on trigger tube 5 are unlocked (see Figure 22).In this case, the fixture block 81 on attic base 23 outer rim jack-up oversheath 8, makes fixture block 81 and bayonet socket 38 thread off, and causes oversheath 8 and main casing 3 to unlock, and allows to extract oversheath 8(in this case and sees Figure 23).

Five-stage:

Figure 25 and Figure 26 represents the state of five-stage.In this case, oversheath 8 is extractd with hands.

6th stage:

Figure 26 represents the state in the 6th stage.In this case, by trigger tube 5 and contact human skin, needle body 6 starts to thrust human body skin.As front end and the contact human skin of trigger tube 5, trigger tube 5 moves backward, and the block 13 on the plug 52 jack-up tail-hood 1 now on trigger tube 5, forces the haptic element hook 11 of tail-hood 1 to be gradually separated with the projection 42 of anterior cannula 4.

7th stage:

Figure 27 represents the state in the 7th stage.In this case, trigger tube 5 continues to move backward, until haptic element hook 11 be separated completely with protruding 42 after under the promotion of spring 7 anterior cannula 4 move forward, and stretch out main casing 3 front end, the front end face of anterior cannula 4 is hampered by human body skin, concordant with trigger tube 5 front end face and together with move.

8th stage:

Figure 28 represents the state in the 8th stage.In this case, needle body 6 starts insulin injection after entering human body skin completely.

9th stage:

Figure 29 and Figure 30 represents the state in the 9th stage.In this case; described injection needle is extracted from human body skin; now anterior cannula 4 is released main casing 3 front end by spring 7; until the projection 42 in anterior cannula 4 is tackled by the second trip step 35 on main casing 3 and stops stretching out forward, now anterior cannula 4 is used for protecting the injection portion (see Figure 29) of needle body 6.In this case, the elasticity empennage 43 of anterior cannula 4 snaps in the anti-back slot 36 of main casing 3 after stretching and forms the spacing of anterior cannula 4 movement backward, prevents anterior cannula 4 rollback (see Figure 30).

Tenth stage:

Figure 31 represents the state in the tenth stage.In this case, novopen is screwed out injection needle, tail-hood 1 moves backward under spring 7 promotes, and two blocks 13 simultaneously on tail-hood 1 clamp the plug 52 on trigger tube 5, and drive trigger tube 5 to move backward.

Use rear state:

Figure 32 represents the rear state of use.In this case, along with novopen constantly screws out, trigger tube 5 continues to move backward until seat bar 24 front end on needle stand 2 is low stops by trigger tube 5 inner front end face.Then; it is spacing that the 3rd trip step 37 that wedge angle trip 14 on tail-hood 1 falls into main casing 3 forms that tail-hood 1 moves forward; and the barb of trigger tube 5 plug 52 coordinates with two blocks 13; be used for limiting tail-hood 1 to move backward in main casing 3 rear end; now tail-hood 1 is used for protecting the linkage section of needle body 6, prevents described injection needle from being used by secondary simultaneously.

As can be seen from above embodiment, the cooperation in this utility model disposable safe type injection of insulin syringe needle between each component structural and the relation of its practical function as follows:

1., before use under state, there is following relationship:

(1) fixture block 81 of oversheath 8 coordinates with the bayonet socket 38 of main casing 3, for realizing the locking of oversheath 8 and main casing 3;

(2) chase 21 of needle stand 2 coordinates with the convex tendon 33 of main casing 3, for realizing the location (first locates) of needle stand 2 and main casing 3;

(3) protuberance 22 of needle stand 2 coordinates with the recess 51 of trigger tube 5, for realizing the location of trigger tube 5 and needle stand 2;

(4) elastic latch 41 of anterior cannula 4 coordinates with the first trip step 31 of main casing 3, proal spacing in main casing 3 for realizing anterior cannula 4;

(5) elastic latch 41 of anterior cannula 4 coordinates with the haptic element hook 11 of tail-hood 1, for realize tail-hood 1 relatively anterior cannula 4 move backward spacing;

(6) coordinating between the block 13 of spring 7, tail-hood 1 and the inner face 44 of anterior cannula 4, wherein, spring 7 one end is resisted against on the block 13 of tail-hood 1, and the other end is resisted against the inner face 44 of anterior cannula 4, for realizing tail-hood 1, connection between anterior cannula 4 and spring 7 and location.

2., in use under state, there is following relationship:

(1) inclined-plane 12 of tail-hood 1 coordinates with the elastic latch 41 of anterior cannula 4, proal spacing in main casing 3 for removing anterior cannula 4.Specifically: in use, along with tail-hood 1 moves forward, inclined-plane 12 is oppressed elastic latch 41 and is curved inwardly, and finally forces elastic latch 41 and the first trip step 31 to break off relations, and removes anterior cannula 4 proal spacing in main casing 3;

(2) the haptic element hook 11 of tail-hood 1 coordinates with the projection 42 of anterior cannula 4, for realize to anterior cannula 4 travel forward carry out spacing.Specifically: in use, along with novopen constantly screws in injection needle, tail-hood 1 moves forward, haptic element hook 11 is by protruding 42 inclined-plane jack-up, cross protruding 42 afterwards, and after elastic latch 41 and the first trip step 31 break off relations, haptic element hook 11 catches on protruding 42 pairs of anterior cannula 4 and travels forward and carry out spacing (protruding 42 are tackled by haptic element hook 11 in travelling forward);

(3) attic base 23 of needle stand 2 coordinates with the draw-in groove 34 of main casing 3, for realizing the location (second locates) of needle stand 2 and main casing 3;

(4) elastic latch 41 of anterior cannula 4 coordinates with the groove 32 of evading of main casing 3, for avoiding the interference of elastic latch 41 pairs of springs 7.Specifically: in use, elastic latch 41 fall into after crossing the first trip step 31 of main casing 3 evade groove 32 be in order to avoid elastic latch 41 pairs of springs 7 interference (avoid elastic latch 41 encounter spring 7 formed interfere);

(5) block 15 of tail-hood 1 coordinates with the attic base 23 of needle stand 2, for realizing running fix.Specifically: in use, along with tail-hood 1 moves forward, block 15 gradually contact attic base 23, and promote attic base 23 shake off above-mentioned first location, continue to move forward, until can not move again after falling into the second location;

(6) attic base 23 of needle stand 2, coordinating between the fixture block 81 of oversheath 8 and the bayonet socket 38 of main casing 3, be used for whether allowing excision oversheath 8 and novopen and injection needle whether to get out the state relation injected.Specifically: in use, when the attic base 23 on needle stand 2 falls into the draw-in groove 34 on main casing 3, first, show that injection needle is formally installed to novopen head; Secondly, fixture block 81 on the outer rim jack-up oversheath 8 of attic base 23, makes oversheath 8 deform, and finally causes the fixture block 81 on oversheath 8 to be threaded off with the bayonet socket 38 on main casing 3, thus realize oversheath 8 and the unblock of main casing 3, now can extract oversheath 8; 3rd, because trigger tube 5 front end is resisted against on the inner face of oversheath 8, when needle stand 2 moves forward, the protuberance 22 on needle stand 2 and the location between the recess 51 on trigger tube 5 are unlocked, and show that trigger tube 5 has entered the state that can trigger;

(7) plug 52 of trigger tube 5 coordinates with the block 13 of tail-hood 1, spacing for what remove that anterior cannula 4 moves forward.Specifically: as front end and the contact human skin of trigger tube 5, trigger tube 5 moves backward, block 13 on plug 52 jack-up tail-hood 1 now on trigger tube 5, the haptic element hook 11 of tail-hood 1 is forced gradually to be separated with the projection 42 of anterior cannula 4, until be completely separated after under the effect of spring 7 anterior cannula 4 move forward, and stretch out main casing 3 front end, the front end face of anterior cannula 4 is hampered by human body skin, concordant with trigger tube 5 front end face and together with move, until pin starts insulin injection after entering human body skin completely.

3., after a procedure under state, there is following relationship:

(1) projection 42 of anterior cannula 4 coordinates with the second trip step 35 of main casing 3, for realizing anterior cannula 4 from main casing 3 outwardly directed spacing (preventing anterior cannula 4 from skidding off from main casing 3);

(2) the elasticity empennage 43 of anterior cannula 4 coordinates with the anti-back slot 36 of main casing 3, for realizing spacing (prevent anterior cannula 4 from main casing 3 rollback) of anterior cannula 4 from the inside rollback of main casing 3;

(3) tail-hood 1 wedge angle trip 14 coordinates with the 3rd trip step 37 of main casing 3, is used for stoping tail-hood 1 to move forward under external force in main casing 3, prevents syringe needle secondary from using.

Embodiment 2: disposable safe injection of insulin syringe needle (rear end needle point protection is not with in the protection of band forward tip)

As shown in figure 36, this injection needle is by needle body 6, needle stand 2, main casing 3, oversheath 8, anterior cannula 4, trigger tube 5 and spring 7.

After understanding of embodiment 1 injection of insulin syringe needle completely, embodiment 2 compared with embodiment 1 only with being with forward tip operator guards, without rear end needle point operator guards.Specifically, in structural design, there is following difference:

The first, embodiment 2 eliminates the tail-hood 1 in embodiment 1;

The second, two forelegs 16 in embodiment 1 tail-hood 1 are transplanted on embodiment 1 needle stand 2 by embodiment 2, see shown in Figure 37.Embodiment 2 remains block 13 set on foreleg 16 and haptic element hook 11.Embodiment 2 eliminates wedge angle trip 14 set on foreleg 16.

3rd, the wedge angle trip 14 of embodiment 2 set by eliminating on foreleg 16, so correspondence eliminates main casing 3 cylinder inboard wall rear portion be provided with the 3rd trip step 37.

4th, embodiment 2 changes because the position of foreleg 16 under confined state before use there occurs compared with embodiment 1 (more forward than origin-location to, crossed the projection 42 of anterior cannula 4), so correspondence eliminates the inclined plane 45 of protruding 42 sides.

Described in embodiment 2, all the other structures of injection of insulin syringe needle are identical with embodiment 1, and in order to save space, this reason no longer carries out repeated description, and those skilled in the art should be easily understood that embodiment 2 after understanding embodiment 1 completely.

The use procedure of embodiment 2 injection of insulin syringe needle is summarized as follows:

As shown in figures 38 and 39, before use under confined state, oversheath 8 is sleeved on outside main casing 3, and the fixture block 81 on oversheath 8 snaps in the bayonet socket 38 of main casing 3 and stretches in main casing 3, oversheath 8 is locked with main casing 3 and is connected; Needle stand 2 and needle body 6 are positioned at main casing 3, attic base 23 on needle stand 2 is in the first position location in main casing 3, on the first position location, the chase 21 in attic base 23 outer marginal circumference direction coordinates with the convex tendon 33 on main casing 3 inner edge and forms concavo-convex location structure, and two forelegs 16 that attic base 23 extends forward stretch to front; Described anterior cannula 4 is positioned at main casing 3, and the elastic latch 41 in anterior cannula 4 is stuck on the first trip step 31 on main casing 3, and restriction anterior cannula 4 relatively main casing 3 travels forward; Described trigger tube 5 is positioned at main casing 3 front end and extends to outside front end, for the protection of the injection portion of needle body 6, trigger tube 5 relatively main casing 3 is provided with move forward spacing, the rear sleeve of trigger tube 5 is contained on the seat bar 24 of needle stand 2, the rear portion of trigger tube 5 is positioned at anterior cannula 4, trigger tube 5 is on the 3rd position location, the front end of trigger tube 5 is close or lean on the inner front end face of oversheath 8, the protuberance 22 that recess 51 on trigger tube 5 is stuck in a bar 24 forms location, now, the attic base 23 on needle stand 2 relatively main casing 3 is on the first position location; Described spring 7 one end is resisted against on the block 13 of needle stand 2 two forelegs 16, and the other end is resisted against on the inner face 44 of anterior cannula 4.

As shown in Figure 40 and 41, in use, when novopen head is screwed in injection needle described in the present embodiment by user, the head of novopen promotes attic base 23 and moves forward, inclined-plane 12 inside foreleg 16 is oppressed elastic latch 41 and is curved inwardly, finally force elastic latch 41 and the first trip step 31 to break off relations and fall into and evade groove 32, remove anterior cannula 4 proal spacing in main casing 3, now under the promotion of spring 7, anterior cannula 4 moves forward, until protruding 42 tackled by haptic element hook 11 and stop mobile and to anterior cannula 4 travel forward carry out spacing; Meanwhile, attic base 23 moves forward to the second position location from the first position location, coordinate in the draw-in groove 34 that attic base 23 outer rim and side end face, front and back snap on main casing 3 inner edge on the second position location and form card lock bit architecture, attic base 23 is locked on the second position location, can not continue forward mobile, can not move backward.In this case, because trigger tube 5 front end leans on the inner front end face of oversheath 8, when needle stand 2 moves forward, the protuberance 22 on needle stand 2 and the 3rd between the recess 51 on trigger tube 5 are located and are unlocked, and now trigger tube 5 and seat bar 24 are formed and be slidably connected.Meanwhile, in this case, the fixture block 81 on attic base 23 outer rim jack-up oversheath 8, makes fixture block 81 and bayonet socket 38 thread off, and causes oversheath 8 and main casing 3 to unlock, extracts oversheath 8 in this case.Then, by trigger tube 5 and contact human skin, needle body 6 starts to thrust human body skin, trigger tube 5 moves backward, block 13 on plug 52 jack-up foreleg 16 now on trigger tube 5, the haptic element hook 11 of foreleg 16 is forced gradually to be separated with the projection 42 of anterior cannula 4, until be completely separated after under the promotion of spring 7 anterior cannula 4 move forward, and stretch out main casing 3 front end, the front end face of anterior cannula 4 is hampered by human body skin, concordant with trigger tube 5 front end face and together with move, until pin starts insulin injection after entering human body skin completely.

As shown in Figure 42 and 43, when extracting described injection needle from human body skin after a procedure, anterior cannula 4 is released main casing 3 front end by spring 7, until the projection 42 in anterior cannula 4 is tackled by the second trip step 35 on main casing 3 and stops stretching out forward, now anterior cannula 4 is used for protecting the injection portion of needle body 6; Simultaneously the elasticity empennage 43 of anterior cannula 4 snaps in the anti-back slot 36 of main casing 3 after stretching and forms the spacing of anterior cannula 4 movement backward, prevents anterior cannula 4 rollback, finally removes described injection needle from described novopen head.

Related content in above embodiment and change are described as follows:

1. more than in two embodiments, what described first location structure adopted is concavo-convex location structure, elastic positioning structure or friction location structure can be adopted with the exception of this to replace, and also can obtain same or analogous technique effect, this is that those skilled in the art are intelligible.First location structure should adopt the location structure of non-locked character theoretically, because attic base 23 outer rim and main casing 3 inner edge are in the first position location before use, and needs to slide axially between attic base 23 outer rim and main casing 3 inner edge in using.

Described elastic positioning structure is coordinated by elasticity pearl pin is formed with depression, elasticity pearl pin with cave in both in, one is located in attic base 23 outer rim, and another one is located on main casing 3 inner edge.

Described friction location structure is formed by attic base 23 outer rim and main casing 3 inner edge frictional fit.

2. more than in two embodiments, the card lock bit architecture that described second location structure adopts, elastic positioning structure, friction location structure or end face can be adopted with the exception of this to replace against location structure, also can obtain same or analogous technique effect, this is that those skilled in the art are intelligible.Second location structure can adopt the location structure of non-locked character theoretically, also can adopt the location structure of locked character.Elastic positioning structure, friction location structure or end face should belong to the location structure of non-locked character against location structure, and in above embodiment, coordinate the card lock bit architecture formed should belong to the location structure of locked character by attic base 23 outer rim and side end face, front and back with draw-in groove 34 set on main casing 3 inner edge.But in this card lock bit architecture, just there is gap when the width of draw-in groove 34 is greater than attic base 23 thickness, when this gap, large attic base 23 to a certain extent just can slidably reciprocate in draw-in groove 34, thus changes into the location structure of non-locked character.

Described end face is formed against coordinating against the anterior end surface of location structure by attic base 23 outer rim with the inner face of main casing 3 inner edge.

3., more than in two embodiments, described bayonet socket 38 is axially positioned on the second position location, as long as in fact the position of bayonet socket 38 all can obtain same or analogous technique effect on the second position location or near the second position location at main casing 3.Refer near described with the second position location as 1 or more rearward on the front, basic point.Position relationship such in this utility model sets to meet particular kind of relationship, this particular kind of relationship is: when attic base 23 moves to the second position location from the first position location, fixture block 81 on attic base 23 outer rim jack-up oversheath 8, oversheath 8 is deformed, fixture block 81 and bayonet socket 38 is finally caused to be threaded off, thus realize oversheath 8 and unlock with main casing 3, the most whether allow to extract the state relation whether oversheath 8 and novopen and injection needle are ready to inject.

4. more than in two embodiments, described trigger tube 5 relatively main casing 3 be provided with the spacing front end by trigger tube 5 that moves forward close to or lean and formed on the inner front end face of oversheath 8.Spacingly other versions can also be adopted in order to what realize moving forward trigger tube 5, such as see shown in accompanying drawing 33-Figure 35, the gear platform 53 of trigger tube 5 lean the chuck 46 on the inner front end face 44 of anterior cannula 4 formed trigger tube 5 relatively main casing 3 be provided with move forward spacing.

5. more than, two embodiments are in order to the example that technical solutions of the utility model provide is described, from the introduction of this utility model background technology and the technical issues that need to address and goal of the invention, relate generally to needle stand 2, main casing 3, oversheath 8 and trigger tube 5 and the structure between them thereof and annexation, associate not quite with tail-hood 1, anterior cannula 4 and spring 7.In other words, tail-hood 1, anterior cannula 4 and spring 7 belong to inessential structure for this utility model, can allow them that some changes occur, such as, save the tail-hood 1 for the protection of needle body 2 linkage section; The technical solution of the utility model is applied in the Chinese patent CN101563124A of background technology introduction; The technical solution of the utility model to be applied in US Patent No. 2011/0288491A1 etc.

Above-described embodiment, only for technical conceive of the present utility model and feature are described, its object is to person skilled in the art can be understood content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All equivalences done according to this utility model spirit change or modify, and all should be encompassed within protection domain of the present utility model.

Claims (10)

1. a disposable safe injection of insulin syringe needle, comprising:

Needle body (6), this needle body (6) has the injection portion of a forward end direction extension, the linkage section of a direction extension to the back-end and a canned paragraph between injection portion and linkage section;

Needle stand (2), this needle stand (2) is for fixing needle body (6), and the canned paragraph of described needle body (6) is fixed on needle stand (2), and the injection portion of needle body (6) is stretched out from needle stand (2) front end, and the linkage section of needle body (6) stretches out from needle stand (2) rear end;

Main casing (3), this main casing (3) is tube structure, and needle stand (2) and needle body (6) are positioned at main casing (3) in the assembled condition, and the rear end of main casing (3) is for connecting novopen;

Trigger tube (5), the agent structure of this trigger tube (5) is body, and under confined state, trigger tube (5) is positioned at main casing (3) front end and extends to outside front end before use, for the protection of the injection portion of needle body (6);

It is characterized in that:

Described needle stand (2) is made up of attic base (23) and seat bar (24), and seat bar (24) is positioned at attic base (23) front end and is fixedly connected with attic base (23); The outer rim of attic base (23) matches with the inner edge of main casing (3), corresponding attic base (23) outer rim is interval with the first position location and the second position location vertically on main casing (3) inner edge, be installed in the process of described novopen at described injection needle, utilize novopen head to force attic base (23) to move forward to the second position location vertically from the first position location in main casing (3) to the axial thrust that needle stand (2) produces, thus make to form the annexation of sliding and locating between needle stand (2) and main casing (3); On the first position location, the outer rim of attic base (23) is coordinated by the first location structure with the inner edge of main casing (3), and on the second position location, the outer rim of attic base (23) is coordinated by the second location structure with the inner edge of main casing (3); Described first location structure adopts concavo-convex location structure, elastic positioning structure or friction location structure; Described second location structure adopts concavo-convex location structure, elastic positioning structure, friction location structure, card lock bit architecture or end face against location structure;

Described trigger tube (5) relatively main casing (3) is provided with move forward spacing, and the rear sleeve of trigger tube (5) is contained on the seat bar (24) of needle stand (2); Between trigger tube (5) body and seat bar (24), side is provided with recess (51), opposite side is provided with protuberance (22), recess (51) is stuck in the upper formation the 3rd of protuberance (22) and locates, when seat bar (24) is in the 3rd position location to trigger tube (5) relatively, the attic base (23) on needle stand (2) relatively main casing (3) is on the first position location; When attic base (23) moves forward to the second position location vertically from the first position location in main casing (3), trigger tube (5) and seat bar (24) are removed the 3rd and are located, and formation is slidably connected.

2. injection needle according to claim 1, it is characterized in that: outside described main casing (3), be provided with oversheath (8), this oversheath (8) is tube-in-tube structure, and under confined state, oversheath (8) is sleeved on main casing (3) outside before use, overall for the protection of described injection needle; Described trigger tube (5) relatively main casing (3) be provided with the spacing front end by trigger tube (5) that moves forward close to or lean and formed on the inner front end face of oversheath (8).

3. injection needle according to claim 1, is characterized in that: described concavo-convex location structure to be coordinated with the convex tendon (33) be located on main casing (3) inner edge by the chase (21) being located at attic base (23) outer marginal circumference direction and formed.

4. injection needle according to claim 1, is characterized in that: described elastic positioning structure is coordinated by elasticity pearl pin is formed with depression, elasticity pearl pin with cave in both in, one is located in attic base (23) outer rim, and another one is located on main casing (3) inner edge.

5. injection needle according to claim 1, is characterized in that: described friction location structure is formed by attic base (23) outer rim and main casing (3) inner edge frictional fit.

6. injection needle according to claim 1, is characterized in that: described card lock bit architecture to be coordinated with draw-in groove (34) set on main casing (3) inner edge by attic base (23) outer rim and side end face, front and back and formed.

7. injection needle according to claim 1, is characterized in that: described end face is formed against coordinating against the anterior end surface of location structure by attic base (23) outer rim with the inner face of main casing (3) inner edge.

8. injection needle according to claim 2, it is characterized in that: described main casing (3) cylinder lateral wall is provided with bayonet socket (38), bayonet socket (38) is axially arranged corresponding second position location at main casing (3), this bayonet socket (38) is a through hole running through between main casing (3) inside and outside wall, to being provided with fixture block (81) by through hole on oversheath (8) sleeve lining, under oversheath (8) suit main casing (3) state, fixture block (81) snaps in bayonet socket (38) and stretches in main casing (3), oversheath (8) is locked with main casing (3) be connected, when attic base (23) moves to the second position location from the first position location, fixture block (81) on attic base (23) outer rim jack-up oversheath (8), oversheath (8) is deformed, fixture block (81) and bayonet socket (38) is finally caused to be threaded off, thus realize oversheath (8) and main casing (3) and unlocks, allow excision oversheath (8) in this case.

9. injection needle according to claim 8, it is characterized in that: the sleeve lining of described oversheath (8) is provided with vertically inwardly outstanding rib (82), when oversheath (8) is sleeved on main casing (3) outer rear flank, between oversheath (8) inwall and main casing (3) outer wall, leave the gap deformed for oversheath (8).

10. injection needle according to claim 8, is characterized in that: bayonet socket (38) place of described main casing (3) is provided with the chute (39) of forward end direction extension, departs from bayonet socket (38) to be conducive to fixture block (81).