CN2841031Y

CN2841031Y - Needle structure with extending protective cover

Info

Publication number: CN2841031Y
Application number: CN 200520130004
Authority: CN
Inventors: 黄仲荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-28
Filing date: 2005-10-28
Publication date: 2006-11-29
Anticipated expiration: 2015-10-28

Abstract

The utility model relates to a needle head structure with an extending protective cover, which comprises a needle head group, a needle head, a clamping part, a safety device and a protective cover, wherein the needle head group has a needle head seat which is arranged at the front end of a needle cylinder seat; the needle head is arranged at the front end of the needle head seat; the clamping part is arranged in the reserved position of the outer edge of the needle head seat; the safety device comprises a protective sleeve which is in a hollow cylinder shape with a penetrating hole at the front end, the protective sleeve is sheathed at the outer edge of the needle head seat, the outer edge of the protective sleeve is provided with a fastening part which can be mutually embedded with the clamping part, and a convex seat is arranged in the reserved position of the outer edge at the back end of the protective sleeve; the protective cover which is hollow cylindrical is sheathed at the outer edge of the protective sleeve. When the safety device and the needle head seat are in an extending state of mutual fastening, the needle head is positioned in the inner part of the safety device because of the members, the containing efficacy can be achieved to prevent the needle head after use from exposing, and simultaneously, the needle head does not need aligning action of covering back. The looseness of the protective cover can not lead the condition that the needle cylinder is exposed outside. The danger that nursing workers are punctured by needles can be caused, so the safety of the utility model can be improved.

Description

Tool extended protective cover needle head structure

Technical field

This utility model relates to a kind of syringe cylinder structure; particularly relate to a kind of tool extended protective cover needle head structure; mainly provide a simple structure; applicable to all types of syringes,, and after using, can take in syringe needle and avoid exposed as syringe cylinder, butterfly syringe, and hemostix etc.; simultaneously do not need extra syringe needle to return the alignment actions of cover; can directly abandon and need not dismounting, improve safety, significantly reduce by the danger of needlestick injury.

Background technology

Because pinprick and sharp object cut and stab is potential occupational hazard common in laboratory and the hospital, medical personnel are infected in pinprick probably, if the utensil of being pricked so just might be infected to patient's disease on one's body for being stained with " the contaminative pin device " of patients'blood or body fluid; Because the generation of pinprick accident, each hospital also more and more payes attention to its safety when buying pin device, and whether has a main demand that is designed to of safety device.

Because mostly the situation of the most pinprick of medical personnel is to occur in syringe needle and returns cover, had the needle sting of communicate illness to be infected when avoiding the nurse to reinstall needle cover after having an injection for sufferer, the syringe with safeguard construction is then done one's utmost the emphasis of design improved for the dealer; The existing market major part still is to use conventional syringes, moreover is the disposable type syringe, is the safety syringe then; General syringe cylinder structure can be divided into injection and blood sampling formula haply according to its occupation mode; And its design with safety device of the syringe of any form mainly can be divided into two kinds, a kind of is to set up a protector in syringe cylinder structure, after using this protector is covered the syringe needle that exposes, this type of safety device is applicable to injection and blood sampling formula syringe cylinder structure; Another kind is a haulback type, after promptly using syringe needle is pulled back retraction in syringe, push rod is fractureed again, and it claims type self-destroyed again, and this type of design is applicable to the injection syringe cylinder structure more.

Just, with the technical development of syringe association area, reached the quite skillful stage, thereby only can do preferable improvement, can promote effect with it at the technical characterictic of certain little part; This utility model mainly is at the safety syringe-drum with over cap, and the group of its inside is established structure, makes a preferable structural improvement, to promote effect.

Known safety syringe structure with over cap, please refer to Figure 16 to Figure 17, this structure consists predominantly of: a syringe group 81, and it has a syringe 811, with a needle holder 812 of being located at these syringe 81 front ends and syringe needle 813 and be located at a propeller 814 in this syringe 811; One body 82 is the hollow short pipe shape, is located at this syringe group 81 front end predetermined positions, is provided with a protuberance 821 in these body 82 outer rim predetermined positions; One protective cover 83, be hollow tube, be sheathed on respectively this syringe group 81 and sleeve pipe 82 outer rims, the outer peripheral edges of this protective cover 83 are provided with a chute 831 of microscler shape, this chute 831 has a longitudinal part 832 and a transverse part 833, and wherein this longitudinal part 833 comprises a front end stop section 834, turning point, a rear end 835; 833 of this transverse parts include a lock groove 837 of square shape; , can when this syringe uses this protective cover 83 be moved toward back end of syringe in these chute 831 intrinsic displacements by this protuberance 821, during to this front end stop section 834 and stop displacement, this moment, this syringe needle exposed to this protective cover 83 front ends up to these protuberance 821 tops; When this syringe cylinder structure in standby or when not using, this protective cover 83 is moved toward the syringe front end, push up to this rear end up to this protuberance 821, can select laterally to rotate this protective cover 83 and make this protuberance 821 be positioned at this turning point, rear end 835 and be in the syringe resting state this moment, perhaps makes this protuberance 821 be positioned at this lock groove 837 and stop using this syringe.

This structure is compared conventional syringes really and is had more safety, and more one can be standby the effect of state, yet in the syringe of resting state, this protective cover 83 in case of and false touch or artificial careless mistake cause pinprick equally easily, therefore also be in unsettled harm state; Moreover, be equipped in this lock groove 837 with these protective jacket 83 localized designs with this protuberance 821, though this protuberance 821 can be equipped in this lock groove 837, but because the consideration of the rotation application of force, this protuberance 821 can't be provided with and protrude, therefore steadiness is lower, also works the mischief because of the malfunctioning situation of trip takes place bigger external force easily.

Summary of the invention

Main purpose of the present utility model is promptly providing a kind of tool extended protective cover needle head structure, and its processing ease need not the alignment actions that syringe needle returns cover, and the pinprick of avoiding being caused because of calibration endangers, and is safe.

A time purpose of the present utility model is promptly providing a kind of tool extended protective cover needle head structure, and it has more firm syringe needle preventer, can reduce the situation generation that breaks away from, drops because of external force or protective jacket that false touch causes.

A purpose more of the present utility model is promptly providing a kind of tool extended protective cover needle head structure, and it is applicable to any type of syringe cylinder structure, the compatibility and practicality height.

For achieving the above object, this utility model discloses tool extended protective cover syringe needle novel structure, and it includes: a syringe needle group, it has a needle holder, and is located at this cylinder seat front end, a syringe needle with this needle holder, be located at this needle holder front end, a fastening part is located at this needle holder outer rim predetermined position; One safety device, it includes a protective jacket, is the pertusate hollow tube-shape of front end, be sheathed on this needle holder outer rim, in this protective jacket outer rim be provided with can with the mutual chimeric clamping part of this fastening part, a protruding seat, being located at this protective jacket rear end outer rim book office, is to be outer gibbosity; One over cap, the tubular that is hollow is sheathed on this protective jacket outer rim.

By above-mentioned member; when this safety device and this needle holder are the extended state of mutual buckle; this syringe needle then is positioned at this safety device inside; and can reach and take in effect to avoid syringe needle in using the back exposed; syringe needle need not return lid simultaneously; can not cause outside syringe is exposed to yet, cause medical and nursing work person that the danger of pinprick is arranged, so improve its safety because over cap pitches.

In other words, a kind of tool extended protective cover needle head structure provided by the invention mainly is to be located at a cylinder seat front end, include: a syringe needle group, it has the needle holder that through hole is set, and is located at this cylinder seat front end with this needle holder, one syringe needle is located at this needle holder front end; One safety device, it has a protective jacket, is the pertusate hollow tube-shape of front end, be sheathed on this needle holder outer rim, one fastening part, with flange shape this needle holder leading edge predetermined position of being located at, this protective jacket trailing edge be provided with can with the mutual chimeric clamping part that is the groove shape of this fastening part; One lid, the tubular that is hollow is sheathed on this protective jacket outer rim.

By above-mentioned member, when this safety device and this needle holder were mutual sheathed stacked state, its this syringe needle that exposes was positioned at this lid portion inside; When this safety device and this needle holder were the extended state that mutual buckle and total length extend, this syringe needle then was positioned at this safety device inside.

In addition, also have a kind of tool extended protective cover needle head structure, mainly be located at a cylinder seat front end, include: a syringe needle group, it has the needle holder that through hole is set, and is located at this cylinder seat front end with described needle holder, and a syringe needle is located at described needle holder front end; One safety device, have a protective jacket and one first extension, wherein said protective jacket is the pertusate hollow tube-shape of front end, this first extension outer rim is located between described needle holder and the protective jacket, and be sheathed on described needle holder outer rim with its internal diameter, described protective jacket then is sheathed on this first extension outer rim, make described needle holder, first extension and protective jacket three be mutual sheathed stacked state, one fastening part is with the flange shape front end predetermined position of being located at described needle holder and this first extension respectively; One clamping part is located at the respectively rear end book office of this first extension and protective jacket respectively with the groove shape; One lid, the tubular that is hollow is sheathed on this protective jacket outer rim.

The tool extended protective cover needle head structure that this utility model provides has following effect:

1. processing ease need not the alignment actions that syringe needle returns cover, and the pinprick of avoiding being caused because of calibration endangers, and is safe.

2. have more firm syringe needle preventer, can reduce the situation that breaks away from, drops because of external force or protective jacket that false touch causes and take place.

3. applicable to any type of syringe cylinder structure, the compatibility and practicality height.

Description of drawings

Fig. 1 is the three-dimensional exploded view of this utility model one preferred embodiment.

Fig. 2 is the flat assembly drawing of this utility model one preferred embodiment safety device stacked state.

Fig. 3 is the flat assembly drawing one of this utility model one preferred embodiment safety device extended state.

Fig. 4 is the flat assembly drawing two of this utility model one preferred embodiment safety device extended state.

Fig. 5 is usage operation one figure of this utility model one preferred embodiment.

Fig. 6 is usage operation two figure of this utility model one preferred embodiment.

Fig. 7 is usage operation three figure of this utility model one preferred embodiment.

Fig. 8 is usage operation four figure of this utility model one preferred embodiment.

Fig. 9 is the three-dimensional exploded view of this utility model second embodiment.

Figure 10 is usage operation one figure of this utility model second embodiment.

Figure 11 is usage operation two figure of this utility model second embodiment.

Figure 12 is the user mode figure of this utility model the 3rd embodiment.

Figure 13 is usage operation one figure of this utility model the 4th embodiment.

Figure 14 is usage operation two figure of this utility model the 4th embodiment.

Figure 15 is the three-dimensional exploded view of this utility model the 4th embodiment.

Figure 16 is the three-dimensional exploded view of known configurations.

Figure 17 is the user mode figure of known configurations.

Description of reference numerals:

10 cylinder seats, 20 syringe needle groups, 21 needle holder

22 syringe needles, 23 block sets, 24,311,331 profile grooves

30 safety devices, 31 first extensions, 312 first inclined-planes

32 protective jackets, 321 first buckling parts, 322 second inclined-planes

33 second extensions 332 the 3rd inclined-plane, 40 lids

41 second buckling parts, 214,314 location divisions, 315,325 guide grooves

216,316,336 fastening parts, 317,327,337 clamping parts

81 syringe groups, 811 syringes, 812 needle holder

813 syringe needles, 814 propellers, 82 bodies

821 protuberances, 83 protective covers, 831 chutes

832 longitudinal parts, 833 transverse parts, 834 stop sections

Turning point, 835 rear end 837 lock grooves

The specific embodiment

At first please refer to Fig. 1 to Fig. 4; tool extended protective cover syringe needle novel structure provided by the utility model; mainly be to be located at a cylinder seat 10 front ends, it includes: a syringe needle group 20, a safety device 30 and be located at this syringe needle group 20 and a lid 40 of safety device 30 front ends.

This syringe needle group 20, it has the needle holder 21 that through hole is set, and is located at this cylinder seat 10 front ends with this needle holder 21; One syringe needle 22 is located in this needle holder 21 and is exposed a length; These needle holder 21 inner edges are added the block set 23 that the tool through hole is arranged, these needle holder 21 internal diameter edge walls of the tight end of external diameter edge of this block set 23; These needle holder 21 front outers are provided with four profile grooves 24, make these needle holder 21 front end position rubber-likes can in the gap of contracting.

This safety device 30, it has one first extension 31 of being located at these needle holder 21 outer rims and a protective jacket 32 that is sheathed on these first extension, 31 outer rims; These first extension, 31 front ends are provided with four profile grooves 311, make these first extension, 31 front end position rubber-likes can in the gap of contracting; These profile groove 311 inner edge book offices have one first inclined-plane 312 towards its front end flaring pushing and drawing shape; This protective jacket 32 is the pertusate hollow tube-shape of front end; These protective jacket 32 front ends are provided with one first buckling parts 321, are the groove shape that ring is established; These protective jacket 32 inner edge front end book offices have one second inclined-plane 322 of flaring pushing and drawing shape at the bottom of the front end tube.

This lid 40, the tubular that is hollow is sheathed on this protective jacket 32 outer rims; Be provided with in these lid 40 inboards can with one second buckling parts 41 of these first buckling parts, 321 mutual buckles, for ring is established flange.

Respectively can be stacked sheathed state in regular turn between this needle holder 21, first extension 31 and protective jacket 32 threes, and in the front periphery place of this syringe needle group 20 and this first extension 31 respectively, be respectively equipped with a fastening part 216,316 that is flange shape, and respectively the flange shape lower edge of this fastening part 216,316 is the inclined-plane of overhead kick shape; One clamping parts 317,327 that can fasten mutually with this fastening part 216,316, be the groove shape, be located at the respectively rear end peripheral region of this first extension 31 and protective jacket 32 respectively, respectively the lower edge groove of this clamping part 317,327 is the inclined-plane that slightly has a down dip towards its inside, can effectively detain the inclined-plane that is formed on these clamping part 317,327 groove lower edges for the overhead kick lower edge of this fastening part 216,316 respectively; Respectively this needle holder 21 and first extension, 31 front outers are respectively equipped with flange shape at least one location division 214,314; Respectively this protective jacket 32 and first extension, 31 inner edge ancient piece of jade, round, flat and with a hole in its centres are respectively equipped with at least one guide groove 315,325 that cooperates with this location division 214,314 respectively, are the scrobicula shape, can do to locate and upper and lower displacement in it for this location division 214,314 respectively.

When respectively this needle holder 21, first extension 31 and protective jacket 32 were stacked state, wherein elastic these fastening part 216 front ends of tool were not hard pressed naturalness, are located in this first inclined-plane 312; Similarly, elastic respectively this profile groove 311 of these fastening part 316 front end tools is not hard pressed naturalness, is located in this second inclined-plane 322.

When respectively this cylinder seat 21, first extension 31 and protective jacket 32 threes after syringe needle direction displacement one distance, wherein respectively this fastening part 216,316 forces it toward interior compression via this first, second inclined-plane 312,322 respectively with the convergent internal diameter in drawing process, continuing to be stretched to respectively, this clamping part 317,327 fastens mutually, effective release of pressure when respectively this fastening part 216,316 fastens, this moment, respectively the lower edge of these fastening part 216,316 overhead kick shapes was snapped in respectively these clamping part 317,327 groove lower edge inclined-planes, can effectively reach preferable fastening effect; Respectively this cylinder seat 21, first extension 31 and protective jacket 32 threes then are partly stacked state after stretching, and increase the total length that the three piles up, and in its inner formation can ccontaining this syringe needle 22 the degree of depth.

Occupation mode of the present utility model please refer to Fig. 5 to Fig. 8, for preferred embodiment of the present utility model is to use in the syringe cylinder structure of blood sampling formula; Respectively be stacked sheathed state between this cylinder seat 21, first extension 31 and protective jacket 32 threes before using, respectively this cylinder seat 21 and first extension, 31 both front ends all are closely against top in 32 of this protective jackets simultaneously; 40 of this lids are sheathed on this protective jacket 32 outer rims, and this moment, this first, second buckling parts 322,41 was buckling state mutually, and this syringe needle 22 then is positioned at these lid 40 inside and is protected.

During use; at first this lid 40 is taken off; one blood taking tube 50 is inserted in this cylinder seat 10; can take a blood sample; after blood sampling is finished; take out this blood taking tube 50; force in this protective jacket 32 with finger at last and advance towards syringe needle 22 directions; drive this first extension 31 displacement forward simultaneously; respectively this first extension 31 and protective jacket 32 move to respectively 216,316 of this fastening parts and fasten mutually with this clamping part 317,327 respectively; and producing the feel of a vibration, 22 at this syringe needle was placed in these safety device 30 inside and was protected this moment, and is promptly discardable.

Please refer to Fig. 9 to Figure 11, be this utility model second embodiment, is with respectively this safety device 30 and lid 40 are used on the syringe cylinder structure of injection.

Please refer to Figure 12, be this utility model the 3rd embodiment, with respectively this safety device 30 and lid 40 are used on the syringe cylinder structure of injection of insulin.

Please refer to Figure 13 to Figure 15, be this utility model the 4th embodiment, wherein this safety device 30 further includes one second extension 33, be located at respectively between this first extension 31 and protective jacket 32, and be sheathed on this first extension, 31 outer rims with its internal diameter, 32 of this protective jackets are sheathed on this second extension, 33 outer rims, make respectively to be stacked sheathed state in regular turn between this cylinder seat 21, first, second extension 31,33 and protective jacket 32 4; These second extension, 33 front ends are provided with four profile grooves 331, make these second extension, 33 front end positions have flexibly can in the gap of contracting; Respectively these profile groove 331 inner edge book offices have one the 3rd inclined-plane 332 towards its front end flaring pushing and drawing shape; And, this fastening part 216,316,336 is set respectively, and respectively the flange shape lower edge of this fastening part 216,316,336 is the inclined-planes that are the overhead kick shape in respectively holding peripheral region before this needle holder 21 and this first, second extension 31,33; This clamping part 317,327,337 then is located at the respectively rear end peripheral region of this first, second extension 31,33 and protective jacket 32 respectively; And respectively the groove lower edge of this clamping part 317,327,337 is to be the inclined-plane that slightly has a down dip towards its inside, can effectively detain the inclined-plane that is formed on these clamping part 317,327 groove lower edges for the overhead kick lower edge of this fastening part 216,316 respectively; Elastic respectively this profile groove 331 of these fastening part 336 front end tools is not hard pressed naturalness, is located in this second inclined-plane 322.

Use the back to force in this protective jacket 32 and advance in injection towards syringe needle 22 directions with finger; drive respectively this first,

second extension

31,33 and protective jacket 32 displacement forward simultaneously; fasten mutually to 216,316,336 of this fastening parts respectively and this clamping part 317,327,337 respectively; and producing the feel of a vibration, 22 at this syringe needle was placed in these safety device 30 inside and was protected this moment.

Comprehensively above-mentioned, tool extended protective cover needle head structure provided by the utility model has following Characteristic on its structure and on using:

One, the utility model is respectively this cylinder seat 21 and this safety device 30 that is stacked sheathed state, Cooperate the design of sheathed this lid 40, syringe is not used before, respectively this cylinder seat 21, safety device 30 are closely against respectively this protective jacket 32 inner edge tops mutually, are the shortest stack length, and with this lid 40 these syringe needles 22 of protection; After syringe uses, with these safety device 3 past syringe needle direction displacements, to be Long stack length forms a degree of depth with accommodating this syringe needle 22 fully in the inner simultaneously jointly in inside, And reach the protection this syringe needle 22 effect.

Two, utilize respectively this fastening part 216,316 to be fastened on respectively on this clamping part 317,327, can make this peace Full device 30 produces the vibration feel because blocking fastens, simultaneously after fastening after forward displacement one distance Can't recover the front state of originally displacement, the syringe needle after can effectively avoiding using exposes because of false touch.

Three, by this profile groove 24,311 respectively be arranged at respectively respectively this needle holder 21 and safety device 30 before The position, end can make its front end place have flexibly and can inside contract the gap, in the sheathed stacking and propelling of each assembly Comparatively laborsaving during displacement.

Four, respectively this first, second, third inclined-plane 312,322 pull out design towards its front end flaring, can make In respectively this fastening part 216,316 of stacked state, flexible respectively this profile groove 24,311 of its front end tool is not Hard pressed nature and being installed with in it.

Five, this block set 25 can one-body molded mode be mounted on this needle holder 21 inner edge tops, can simplify structure Part, the saving group is established program.

Six, respectively this guide groove 315,325 design can be moved to this in the inner for this location division 214,314 Clamping part 317,327 and stop mobile and be the fastening shape is so that this safety device 30 of the present utility model When advancing the stretching action, comparatively smooth and easy.

Seven, respectively this clamping part 317,327 lower edge groove are the designs that is the inclined-plane that slightly has a down dip towards its inside, Can effectively detain for this fastening part 216 respectively, 316 overhead kick lower edge and be formed under these clamping part 317327 grooves The inclined-plane of edge making to be difficult for sliding after stretch fastening, and reaching better blocking effect, can reduce simultaneously because of False touch and the situation that causes this safety device to slide takes place.

Eight, the utility model can apply in all kinds of injection needle tube structures, such as blood sampling formula, injecting type, pancreas islet The syringes such as plain injection etc. have practicality.

Claims

1, a kind of tool extended protective cover needle head structure mainly is to be located at a cylinder seat front end, it is characterized in that including:

One syringe needle group, it has the needle holder that through hole is set, and is located at this cylinder seat front end with this needle holder, and a syringe needle is located at this needle holder front end;

One safety device, it has a protective jacket, is the pertusate hollow tube-shape of front end, be sheathed on this needle holder outer rim, one fastening part, with flange shape this needle holder leading edge predetermined position of being located at, this protective jacket trailing edge be provided with can with the mutual chimeric clamping part that is the groove shape of this fastening part;

One lid, the tubular that is hollow is sheathed on this protective jacket outer rim; Be mutual sheathed stacked state at this safety device and this needle holder, its this syringe needle that exposes is positioned at this lid portion inside; Be the extended state that mutual buckle and total length extend in this safety device and this needle holder, this syringe needle is positioned at this safety device inside.

2, tool extended protective cover needle head structure according to claim 1 is characterized in that, this protective cover front end inner edge predetermined position has towards its bottom flaring pushing and drawing shape and provides the front end fastening part of this needle holder can be installed with one first inclined-plane at position.

3, tool extended protective cover needle head structure according to claim 1 is characterized in that, respectively this needle holder front outer has flange shape at least one location division; This protective jacket inner edge ancient piece of jade, round, flat and with a hole in its centre is provided with cooperate with this fastening part at least one and is the scrobicula shape for this location division respectively in the guide groove of its intrinsic displacement.

4, a kind of tool extended protective cover needle head structure mainly is located at a cylinder seat front end, it is characterized in that including:

One syringe needle group, it has the needle holder that through hole is set, and is located at this cylinder seat front end with described needle holder, and a syringe needle is located at described needle holder front end;

One safety device, have a protective jacket and one first extension, wherein said protective jacket is the pertusate hollow tube-shape of front end, this first extension outer rim is located between each described needle holder and the protective jacket, and be sheathed on described needle holder outer rim with its internal diameter, described protective jacket then is sheathed on this first extension outer rim, make each described needle holder, first extension and protective jacket three be mutual sheathed stacked state, one fastening part is with the flange shape front end predetermined position of being located at each described needle holder and this first extension respectively; One clamping part is located at the respectively rear end book office of this first extension and protective jacket respectively with the groove shape;

One lid, the tubular that is hollow is sheathed on this protective jacket outer rim.

5, tool extended protective cover needle head structure according to claim 4 is characterized in that, this protective cover front end inner edge predetermined position has one first inclined-plane towards its bottom flaring pushing and drawing shape, provides the front end fastening part of this needle holder can be installed with the position; The profile groove inner edge predetermined position of this first extension front end has towards its front end flaring pushing and drawing shape and provides the front end fastening part of this needle holder can be installed with one second inclined-plane at position.

6, tool extended protective cover needle head structure according to claim 4 is characterized in that, each the described needle holder and the first extension front outer are respectively equipped with flange shape at least one location division; An each described protective jacket and first an extension inner edge ancient piece of jade, round, flat and with a hole in its centre are respectively equipped with cooperate with this location division respectively at least one and are the scrobicula shape for this location division respectively in the guide groove of its intrinsic displacement.

7, tool extended protective cover needle head structure according to claim 4 is characterized in that, the described first extension front end is provided with at least one profile groove, is mutual sheathed stacked state at this protective jacket, its front end position have flexibly can in the gap of contracting.

8, tool extended protective cover needle head structure according to claim 4, it is characterized in that, this safety device further includes one second extension, be located at respectively between this first extension and protective jacket, and being sheathed on this first extension outer rim with its internal diameter, this protective jacket then is sheathed on this second extension outer rim; Respectively this needle holder, first, second extension and protective jacket are mutual sheathed stacked state; This fastening part is located at the front end predetermined position of this needle holder respectively and first, second extension respectively; This clamping part then is located at the rear end book office of this first, second extension respectively and protective jacket respectively.

9, tool extended protective cover needle head structure according to claim 8 is characterized in that, respectively this needle holder and first, second extension front outer are respectively equipped with flange shape at least one location division; Respectively this protective jacket and first, second extension inner edge ancient piece of jade, round, flat and with a hole in its centre are respectively equipped with cooperate with this location division respectively at least one and are the scrobicula shape for this location division respectively in the guide groove of its intrinsic displacement.

10, tool extended protective cover needle head structure according to claim 8 is characterized in that, this second extension front end has at least one profile groove, at the mutual sheathed stacked state of this first extension, its front end position have flexibly can in the gap of contracting.