CN207734168U - Rear pressure type disposable blood taking device with spring correcting structure - Google Patents

Abstract

A kind of rear pressure type disposable blood taking device with spring correcting structure, including shell, needle core, spring and tail-hood；It is characterized in that：It is equipped with correcting structure in spring outwards, correcting structure is fixed on tail-hood, makes the resilient force of spring on the direction of ejection of needle core；Locking mechanism is cooperatively formed by the elastic clip set by shell with needle core；Unlocking mechanism is cooperatively formed with elastic clip end by unlocking inclined-plane by correcting structure front；Tail-hood is pressed when use, correcting structure front forces elastic clip end laterally to be opened in the case where unlocking ramp effect, and needle core emits puncture under the action of the spring after grab is detached from locking critical point.This programme associates spring correcting structure with unlocking mechanism, and a structure is cleverly utilized to generate two kinds of effects, realizes correcting and unlock double effects, had both reduced needle point shake, and had in turn simplified structure, reduce cost.

Description

Rear pressure type disposable blood taking device with spring correcting structure

Technical field

The utility model is related to medical blood taking instrument field, more particularly to a kind of included ejection mechanism and with spring correcting knot The disposable safe hemostix of the rear pressure type of structure（Or blood taking needle）.The feature of this hemostix maximum is can to reduce needle Point shake, reduces feeling of pain, gives painless or hypodynia feeling.

Background technology

In medical blood taking field, disposable blood taking device is small with its, safe to use, easy to operate to be cured deeply for characteristic Shield personnel and patient welcome, and are largely used in each medical institutions and diabetic at present.The included ejection of this hemostix Mechanism, compact-sized, overall time uses, safe and convenient, therefore has stronger market development potential.

With the development in market, the type and form of disposable medical hemostix product are varied at present, but from product From the point of view of design angle, a kind of most important condition of hemostix product quality is weighed, the shooting puncture resistance of its blood taking needle should be investigated, In, the size that needle point is shaken when puncturing human skin is important one of index, it is not only related to the blood sampling effect of needle point, More importantly directly affect the feeling of pain of puncture.Especially today's society, hemostix safety in use and user's body Test the element for having gone up and considering for emphasis in product design.For hemostix product prevents needle point from shaking, theoretically see, shadow There are many factor for ringing needle point shake, such as needle core shooting guide frame, needle core locking structure, needle core trigger architecture, spring performance Etc..However it is at most oriented to the shooting of needle core to consider in previous existing design, that is, is used and opened up guide chute Mode guide needle core to shoot, to reduce shake when needle point punctures, and have ignored the influence of other factors.

On the other hand, it is received by the market and ripe hemostix product will not only have good puncture as a kind of Shooting performance and reliability, at the same also to have it is simple in structure, be convenient for industrialized mass production, the low feature of manufacturing cost. Therefore, in prior art basis, needle point shake how is reduced, user experience is fully considered, while simplifying structure design, reduces Manufacturing cost is Medical blood collecting device product developing direction from now on and the dual problem that those skilled in the art face.

Invention content

In view of the above problem of the existing technology, the utility model provides a kind of rear pressure type one with spring correcting structure Secondary property hemostix, the first purpose are to solve the problems, such as stabilization when above-mentioned hemostix needle point punctures, and the second purpose is to solve The problem of simplifying structure, reducing cost.

In order to achieve the above objectives, the technical solution adopted in the utility model is：A kind of rear pressure type with spring correcting structure Disposable blood taking device, including shell, needle core, spring and tail-hood.

The shell forms an ejection chamber, and by locking mechanism position and lock in ejection chamber, spring at front end acts on needle core On needle core, needle core is slidably connected on needle point direction of ejection by sliding slot guiding with shell.

The tail-hood is mounted on shell tail portion, and is slidably connected on needle point direction of ejection with shell, tail-hood and locking machine Structure cooperatively forms unlocking mechanism, and tail portion push-press type emitting structural is formed with this.

Its innovation is：It is equipped with the correcting structure for righting for the spring, which is located on tail-hood simultaneously It stretches into shell；The correcting structure is made of at least three correcting items, is either made of or by one at least two correcting pieces A pilot is constituted, and pilot either arrange simultaneously in the periphery of spring circumferentially around spring by all correcting items or all correcting pieces And the correcting channel of a restricted spring is formed, spring is located in the correcting channel, and the resilient force of spring is made to be launched in needle point On direction, spring rear end acts on correcting structure or tail-hood.

The locking mechanism is cooperatively formed by shell and needle core, wherein is extended in shell and is equipped at least one elastic arm, bullet Property arm be equipped with and be used for locking grab or the end face of needle core, all elastic arm be collectively formed an elastic clip or elastic arm with One of outer casing inner wall and correcting structure inner wall cooperatively form an elastic clip, and needle core is clamped position and lock in elastic clip In, the locking mechanism is formed with this.

The unlocking mechanism is cooperatively formed by correcting structure and elastic arm, wherein after correcting structure forward face is to elastic arm Portion is arranged, and in both correcting structure front and elastic arm rear portion, at least one is equipped with unlock inclined-plane.

In a state of use, when tail-hood is pushed, tail-hood moves forward inside the shell, and correcting structure front meets bullet head-on Property arm rear portion, and force elastic arm end laterally to be opened under the action of unlocking inclined-plane, when on elastic arm grab or end face it is de- Emit puncture under the action of the spring from needle core after locking critical point.

The related content and change interpretation of above-mentioned technical proposal are as follows：

1. in said program, " shell ", " needle core ", " spring " and " tail-hood " is tail portion push type disposable blood taking device Basic structure, basic function and effect are the prior art.

2. in said program, " preceding " in " front end " and " front " refers to needle point direction in hemostix.It is described " rear " in " rear end " and " rear portion " refers to the negative direction of " preceding ".

3. in said program, " locking mechanism " refers to the knot that hemostix is used for locking needle core under state before transmission Structure." unlocking mechanism " refers to the structure that hemostix is used for triggering needle core ejection in a state of use.

4. in said program, how " inclined-plane " in " the unlock inclined-plane " includes plane, cambered surface or the conical surface, however, Opposite hemostix axis is obliquely installed, to constitute inclined-plane.In other words, inclined-plane has inclined-plane, the concave form of plane form Inclined-plane（Inclined-plane is in an inclined direction made of multistage straight line, is upwardly formed concave surface or convex surface in vertical tilt side, but essence is also It is inclined-plane）, conical surface form inclined-plane and cambered surface form inclined-plane（Inclined-plane is in an inclined direction by least one section of concave arc or/and convex Arc is constituted, but essence or inclined-plane）Four types.Any type is applicable in the present invention, specifically can be according to reality Situation determines.Wherein, the first be plane form inclined-plane；It is for second the inclined-plane of concave form；The third is cone-shaped The inclined-plane of formula；4th kind be cambered surface form inclined-plane.

5. pressure type disposable blood taking device includes to turn round two kinds of structures of shape for hat and block type after the utility model.That is the utility model Disposable blood taking device normal conditions have protective cap, and the structure type of protective cap may be used and turn round shape for hat or block type.This Have no effect on realization the object of the invention.

The design principle of the utility model and design are：In order to reduce needle point shake and simplify structure, cost is reduced, originally Utility model uses following technical measures：First, it is provided with a correcting structure for being used for restricted spring in spring outwards, is led to Correcting effect of the spring under assembly, transmitting and retracted state can be ensured by crossing correcting structure；Second, correcting structure is specifically by extremely Few three correcting items are constituted, and are either made of at least two correcting pieces or are made of a pilot, and these structures have Conducive to simplified structure and reduce cost；Third extends in shell and is equipped with extremely by locking mechanism design between shell and needle core A few elastic arm, elastic arm are individually formed an elastic clip or elastic arm and coordinate with one of shell and correcting structure An elastic clip is formed, locking needle core is clamped using this elastic clip；4th, cleverly utilize correcting structure front and elasticity It presss from both sides the movement of end and cooperation helps to realize that needle core unlocks on unlock inclined-plane, i.e., cleverly by spring correcting structure and unlock Associated therewith gets up, and generates two effects using a structure, realizes correcting and unlock double effects.

Due to the application of the above technical scheme, the utility model has the following advantages and effect compared with prior art：

1. the utility model is after spring outwards increase correcting structure, to reducing needle point shake, reduces and puncture feeling of pain tool There is remarkable result.Research find to cause the factor of pain in addition to needle point deflection and other than, the needle point shake mainly in transmission path （Or it rocks）.In previous existing design, in order to reduce shake of the needle point when puncturing, only with the mode for opening up guide chute It guides needle core to shoot, and has ignored spring and have an effect not positive influence.Spring is the dynamical element of needle core transmitting in hemostix, If spring torsional deformation in the case where compressing assembled state, spring when transmitting can be caused to have an effect not just, when directly affecting puncture Needle point shakes size and verticality.Cause spring have an effect not positive factor mainly have it is following two：First is, spring-compressed installation Under state, distortion is laterally heaved at middle part；Second is, spring installation positioning is inaccurate.The utility model is by correcting structure to bullet Spring assembles posture and stress is corrected, and is led so as to ensure that spring is in always in transmitting, retraction and resonant process Positive status.

2. the utility model after spring outwards increase correcting structure, can greatly improve spring assembly posture and stress Consistency.

3. the utility model cleverly utilizes the movement of correcting structure front and elastic clip end and cooperation unlocking inclined-plane It helps to realize that needle core unlocks, i.e., spring correcting structure is associated with unlocking mechanism, cleverly a structure is utilized to produce Raw two kinds of effects, realize correcting and unlock double effects.

4. the utility model correcting structure and correcting structure front coordinate with elastic clip end and the unlocking mechanism of formation, Both needle point shake had been reduced, and had in turn simplified structure, reduce cost.

5. the utility model, which overcomes the previous prior art, only considers needle core slide-and-guide, and ignores spring as power member The influence that part shakes needle point.Needle point shake can be reduced by correcting structure, feeling of pain is reduced, gives painless or hypodynia Feel, therefore there is substantive distinguishing features outstanding and significant progress.

Description of the drawings

Fig. 1 is 1 stereogram exploded view of the utility model embodiment；

Fig. 2 is 1 needle core of the utility model embodiment and torsion cap stereogram；

Fig. 3 is the partial enlarged view of Fig. 2；

Fig. 4 is 1 shell three-dimensional cutaway view of the utility model embodiment；

Fig. 5 is 1 tail-hood stereogram of the utility model embodiment；

Fig. 6 is 1 initial assembled state sectional view of the utility model embodiment；

Fig. 7 is pressing tail-hood state sectional view after 1 removal needle cap of the utility model embodiment；

Fig. 8 is 1 Continued depression tail-hood state sectional view of the utility model embodiment；

Fig. 9 is the first change programme stereogram of correcting structure in the utility model embodiment 1；

Figure 10 is second of change programme stereogram of correcting structure in the utility model embodiment 1；

Figure 11 is hemostix stereogram of the utility model embodiment 4 with fool proof column；

Figure 12 is the tail-hood stereogram of the utility model embodiment 4；

Figure 13 is hemostix sectional view of the utility model embodiment 4 with fool proof column；

Figure 14 is hemostix three-dimensional cutaway view of the utility model embodiment 4 with fool proof column；

Figure 15 is the utility model embodiment 5 with the hemostix stereogram for adjusting header structure；

Figure 16 is the utility model embodiment 6 with adjusting header structure stereogram exploded view.

Label declaration in the figures above is as follows：

1. shell；2. needle core；3. spring；4. tail-hood；5. elastic arm；6. grab；7. contractible neck；8. snap-latch surface；9. going out needle Hole；10. unlocking inclined-plane；11. turning round cap；12. correcting item；13. correcting piece；14. pilot；15. torsional part；16. guard bar；17. Adjust head；18. fool proof column；19. block.

Specific implementation mode

The utility model is further described with reference to the accompanying drawings and embodiments：

Embodiment 1：A kind of rear pressure type disposable blood taking device with spring correcting structure（Turn round shape for hat）

As Figure 1-Figure 8, which is made of shell 1, torsion cap 11, needle core 2, spring 3 and tail-hood 4（See Fig. 1）.

The shell 1 forms an ejection chamber, and by locking mechanism position and lock in ejection chamber, 3 front end of spring acts on needle core 2 On needle core 2, needle core 2 is slidably connected on needle point direction of ejection by sliding slot guiding with shell 1（It is not shown in figure）.

The torsion cap 11 is located at 2 front of needle core, and links into an integrated entity injection molding structure with needle core 2（See Fig. 1 and Fig. 2）, It may be regarded as a component.Torsion cap 11, which is fixedly connected by torsional part 15 with guard bar 16, to be constituted（See Fig. 2）, guard bar 16 and needle core 2 Between be provided with the contractible neck 7 that can be twisted off.Draw point is equipped in needle core 2, guard bar 16 is sleeved on the needle point of draw point, for protecting Draw point.It dials except the needle point of draw point after torsion cap 11 exposes in 2 front end of needle core, is used for puncture blood collecting.1 head of the shell is equipped with out needle Hole 9（See Fig. 4, Fig. 7 and Fig. 8）, the maximum outside diameter of the torsional part 15 is more than the maximum diameter of hole of needle outlet 9, and 16 He of guard bar Needle core 2 can penetrate assembly from 9 front end of needle outlet.

The tail-hood 4 is mounted on 1 tail portion of shell, and is slidably connected on needle point direction of ejection with shell 1, tail-hood 4 and lock Determine mechanism and cooperatively form unlocking mechanism, tail portion push-press type emitting structural is formed with this.

The utility model is equipped with the correcting structure for righting for the spring 3, which is located on tail-hood 4 simultaneously It stretches into shell 1（See Fig. 5, Fig. 6）.The correcting structure is made of at least three correcting items 12, in the present embodiment, correcting knot Structure is actually made of four correcting items 12（See Fig. 5）, certain five or six roots of sensation correcting item 12 it is also possible, people in the art Member is readily appreciated that.All correcting items 12 are arranged circumferentially around spring 3 in the periphery of spring 3 and form leading for a restricted spring 3 Positive channel, spring 3 are located in the correcting channel, make the resilient force of spring 3 on needle point direction of ejection, and 3 rear end of spring is made With on correcting structure or tail-hood 4.

The locking mechanism is cooperatively formed by shell 1 and needle core 2, wherein extends elastic arm 5 there are two setting in shell 1（See Fig. 4）, elastic arm 5 is equipped with the grab 6 for being used for locking needle core 2, and the corresponding grab 6 is on needle core 2 equipped with snap-latch surface 8（See figure 2 and Fig. 3）, all elastic arm 5 is collectively formed an elastic clip, and needle core 2 is clamped to be located in elastic clip, snap-latch surface 8 and grab 6 cooperations are used for locking needle core 2（See Fig. 6）, the locking mechanism is formed with this.

The unlocking mechanism is cooperatively formed by correcting structure and elastic arm 5, wherein correcting structure forward face is to elastic arm 5 Rear portion is arranged, and in both 5 rear portions of correcting structure front and elastic arm, at least one is equipped with unlock inclined-plane 10.In this reality It applies in example, unlock inclined-plane 10 is located at correcting structure front, i.e. 12 front end of correcting item（See Fig. 5-8）.Certainly, if inclined-plane will be unlocked 10 are located at 5 rear end of elastic arm, or it is also feasible that unlock inclined-plane 10 is arranged simultaneously in correcting structure front end and 5 rear end of elastic arm 's.

Action process is as follows when the present embodiment uses：

（1）Initial assembled state

As shown in fig. 6, entire hemostix is made of shell 1, torsion cap 11, needle core 2, spring 3 and tail-hood 4, wherein spring 3 In preloading condition, before transmission under assembled state, an elastic clip is collectively formed in all elastic arm 5, and needle core 2 passes through snap-latch surface 8 clamped position and locks are in elastic clip, wherein the grab 6 on elastic arm 5 coordinates with the snap-latch surface 8 on needle core 2, makes needle core 2 It is in the lock state.The rear end of the elastic arm 5 is arranged in unlock 10 front of inclined-plane（12 front end of correcting item）.

（2）Tail-hood state is pressed after removal needle cap

As shown in fig. 7, a hand holds hemostix shell 1, another hand is reversed and is dialled except torsion cap 11.Then, it will take a blood sample Device head is directed at blood sampling site, presses tail-hood 4, and tail-hood 4 moves forward in shell 1.

（3）Needle core unhook state

As shown in figure 8, as tail-hood 4 persistently moves backward, correcting structure（That is correcting item 12）After front meets elastic arm 5 head-on Portion, and force 5 end of elastic arm laterally to be opened under the action of unlocking inclined-plane 10, face when the grab 6 on elastic arm 5 is detached from locking Needle core 2 issues in the effect of spring 3 and is shot through thorn after boundary's point.

It is explained as follows below for the possible variation of embodiment 1：

1. above example 1 is although what is provided is to turn round shape for hat head press-type disposable blood taking device, the utility model is not It is confined to this, is also applied for block type head press-type disposable blood taking device.Torsion cap and block are two kinds of hemostix protective cap Form, but both forms are unrelated with the innovative point of the utility model, and this is skilled artisans appreciate that and cognition Situation.

2. in above example 1, set that there are two elastic arms 5 in the shell 1（See Fig. 4）, two compositions of elastic arms 5 one A elastic clip, for locking needle core 2 to be clamped.But the utility model is not limited to this, constitutes elastic clip and comes from 5 quantity of elastic arm See it can is two, three, four, five, six etc..This be skilled artisans appreciate that and cognition the case where.

3. in above example 1, figure 4, it is seen that the elastic arm 5 is straight-arm shape structure.But this practicality is new Type is not limited to this, and the elastic arm 5 can also be crank arm type structure or folding arm shape structure.This is people in the art Member on the basis of embodiment 1 it will be appreciated that and cognition the case where.

4. in above example 1, spring 3 is an independent hardware, can also spring 3 be designed as plastics bullet Spring, and made integrally with needle core 2.Skilled addressee readily understands that such situation of change.

5. in above example 1, the correcting structure is made of four correcting items 12（See Fig. 5）.But the utility model Not limited to this, the correcting structure can also be made of at least two correcting pieces 13（See Fig. 9）, or by a pilot 14 It constitutes（See Figure 10）.This is the case where those skilled in the art are readily appreciated that and recognize on the basis of embodiment 1.

6. in above example 1,3 rear end of the spring acts on tail-hood 4.But the utility model is not limited to this, 3 rear end of the spring can also act on correcting structure.This be skilled artisans appreciate that and cognition the case where.

7. in above example 1,3 front end top pressure of spring is on needle core 2, if 2 tail portion of needle core is socketed a part Or make seperated needle core, this part again with 3 top pressure of spring, and skilled artisans appreciate that and cognition feelings Condition also belongs to the scope of protection of the utility model.The essence of the utility model here is that 3 front end of spring acts on needle core 2, Wherein, there are directly effect and two kinds of situations of indirectly-acting.Situation described above belongs to the connotation of indirectly-acting.

Embodiment 2：A kind of rear pressure type disposable blood taking device with spring correcting structure（Shape for hat is turned round, between shell and needle core Locking mechanism it is different from embodiment 1）

The disposable blood taking device is made of shell 1, torsion cap 11, needle core 2, spring 3 and tail-hood 4（Diagram is not provided）.

Difference lies in the locking mechanism between shell 1 and needle core 2 is different from embodiment 1 for the present embodiment 2.Embodiment 1 is： Extend elastic arm 5 there are two setting in shell 1（See Fig. 4）, elastic arm 5, which is equipped with, is used for locking the grab 6 of needle core 2, it is corresponding described in Grab 6 is equipped with snap-latch surface 8 on needle core 2（See Fig. 2 and Fig. 3）, an elastic clip is collectively formed in two elastic arms 5, and needle core 2 is pressed from both sides Position and lock is held in elastic clip, which is used for locking needle core 2 with the cooperation of grab 6（See Fig. 6）, the lock is formed with this Determine mechanism.Embodiment 2 is（Diagram is not provided）：Extend an elastic arm 5 in shell 1, elastic arm 5, which is equipped with, to be used for locking needle core 2 grab 6 or end face, elastic arm 5 cooperatively form an elastic clip with 1 inner wall of shell, and needle core 2 is clamped position and lock in elasticity In folder, the locking mechanism is formed with this.It can be seen that elastic clip can be not only made of at least two elastic arms 5, it can also It is cooperatively formed by least one elastic arm 5 and 1 inner wall of shell.

Other contents are same as Example 1, and description is not repeated herein.

It is suitable for the present embodiment 2 in relation to 1 possible all changes of embodiment above, is also not repeated to describe here.

Embodiment 3：A kind of rear pressure type disposable blood taking device with spring correcting structure（Shape for hat is turned round, between shell and needle core Locking mechanism it is different from embodiment 1）

The disposable blood taking device is made of shell 1, torsion cap 11, needle core 2, spring 3 and tail-hood 4（Diagram is not provided）.

The present embodiment 3 and embodiment 1 difference lies in：Locking mechanism between shell 1 and needle core 2 is different.Embodiment 3 is （Diagram is not provided）：Extending an elastic arm 5 in shell 1, elastic arm 5 is equipped with grab 6 or the end face for being used for locking needle core 2, Elastic arm 5 cooperatively forms an elastic clip with 12 inner wall of correcting item, and needle core 2 is clamped position and lock in elastic clip, with this shape At the locking mechanism.It can be seen that elastic clip can be not only made of at least two elastic arms 5, it can also be by least one Elastic arm 5 is cooperatively formed with 12 inner wall of correcting item.

Other contents are same as Example 1, and description is not repeated herein.

It is suitable for the present embodiment 3 in relation to 1 possible all changes of embodiment above, is also not repeated to describe here.

Embodiment 4：A kind of rear pressure type disposable blood taking device with spring correcting structure（Band anti-misoperation device and torsion shape for hat）

As shown in figure 11, which is made of shell 1, torsion cap 11, needle core 2, spring 3 and tail-hood 4.

The present embodiment 4 and embodiment 1 difference lies in：Extend forward on the tail-hood 4 and is equipped with fool proof column 18（See Figure 12）, The corresponding fool proof column 18 is equipped with block 19 on the guard bar 16 for turning round cap 11（See Figure 11）, under initial assembled state, fool proof column 18 is close or withstand on block 19, makes tail-hood 4 that can not be moved forward under the premise of last removal turns round cap 11, i.e., does not remove and turn round cap 11, Tail-hood 4 because fool proof column 18 is close or be against on block 19 can not move forward triggering needle core 2 emit（See Figure 13 and Figure 14）.

Other contents are same as Example 1, and description is not repeated herein.

It is suitable for the present embodiment 4 in relation to 1 possible all changes of embodiment above, is also not repeated to describe here.

Embodiment 5：A kind of rear pressure type disposable blood taking device with spring correcting structure（It is included to adjust head and turn round shape for hat）

As shown in Figure 15 and Figure 16, the hemostix is by 4 groups of shell 1, adjusting head 20, torsion cap 11, needle core 2, spring 3 and tail-hood At.

The present embodiment 4 and embodiment 1 difference lies in：1 head of shell is equipped with the adjusting head 20 that can change paracentesis depth Structure.And the adjusting head 20 that can change paracentesis depth may be used the prior art, such as using application No. is 201610158481.8 publication No. CN105816188A, entitled《The disposable depth-adjustable needle insertion safety blood taking of modified Needle》Chinese patent application disclosed in structure, or use Patent No. 201620212700.1, Authorization Notice No. is CN205586011U, it is entitled《Improved disposable safety blood taking needle capable of adjusting puncture depth》Chinese patent disclosed in knot Structure is not described in detail herein.

Other contents are same as Example 1, and description is not repeated herein.

It is suitable for the present embodiment 5 in relation to 1 possible all changes of embodiment above, is also not repeated to describe here.

Above-described embodiment is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique Personage can understand the content of the utility model and implement according to this, the scope of protection of the utility model can not be limited with this. It is all according to equivalent change or modification made by the spirit of the present invention essence, should all cover the scope of protection of the utility model it It is interior.

Claims (6)

1. a kind of rear pressure type disposable blood taking device with spring correcting structure, including shell（1）, needle core（2）, spring（3）And Tail-hood（4）；

The shell（1）Form an ejection chamber, needle core（2）By locking mechanism position and lock in ejection chamber, spring（3）Make front end Used in needle core（2）On, needle core（2）With shell（1）It is slidably connected by sliding slot guiding on needle point direction of ejection；

The tail-hood（4）Mounted on shell（1）Tail portion, and and shell（1）It is slidably connected on needle point direction of ejection, tail-hood（4） Unlocking mechanism is cooperatively formed with locking mechanism, tail portion push-press type emitting structural is formed with this；

It is characterized in that：For the spring（3）Equipped with the correcting structure for righting, which is located at tail-hood（4）On And stretch into shell（1）It is interior；The correcting structure is by least three correcting items（12）It constitutes, or by least two correcting pieces（13） It constitutes, or by a pilot（14）It constitutes, pilot（14）Or all correcting items（12）Or all correcting pieces（13） In spring（3）Periphery circumferentially around spring（3）It arranges and forms a restricted spring（3）Correcting channel, spring（3）It is located at In the correcting channel, make spring（3）Resilient force on needle point direction of ejection, spring（3）Rear end acts on correcting structure Or tail-hood（4）On；

The locking mechanism is by shell（1）With needle core（2）It cooperatively forms, wherein shell（1）Interior extend is equipped at least one elasticity Arm（5）, elastic arm（5）It is equipped with and is used for locking needle core（2）Grab（6）Or end face, all elastic arm（5）It is collectively formed one Elastic clip or elastic arm（5）With shell（1）One of inner wall and correcting structure inner wall cooperatively form an elastic clip, needle Core（2）Clamped position and lock forms the locking mechanism in elastic clip with this；

The unlocking mechanism is by correcting structure and elastic arm（5）It cooperatively forms, wherein correcting structure forward face is to elastic arm（5） Rear portion is arranged, in correcting structure front and elastic arm（5）In the two of rear portion, at least one is equipped with unlock inclined-plane（10）；

In a state of use, work as tail-hood（4）When being pushed, tail-hood（4）In shell（1）Interior forward movement, correcting structure front Meet elastic arm head-on（5）Rear portion, and on unlock inclined-plane（10）Under the action of force elastic arm（5）End is laterally opened, and elastic arm is worked as （5）On grab（6）Or end face is detached from needle core after locking critical point（2）In spring（3）Effect, which issues, is shot through thorn.

2. hemostix according to claim 1, it is characterised in that：The needle core（2）Front, which is equipped with, turns round cap（11）, with this structure At torsion shape for hat head press-type disposable blood taking device.

3. hemostix according to claim 2, it is characterised in that：The torsion cap（11）Positioned at needle core（2）Front, and and needle Core（2）Link into an integrated entity injection molding structure, turns round cap（11）By torsional part（15）And guard bar（16）It is fixedly connected with composition, is protected Bar（16）With needle core（2）Between be provided with the contractible neck that can be twisted off（7）.

4. hemostix according to claim 3, it is characterised in that：The tail-hood（4）On forward extend be equipped with fool proof column （18）, the corresponding fool proof column（18）Turning round cap（11）Guard bar（16）It is equipped with block（19）, under initial assembled state, prevent Slow-witted column（18）It is close or withstand on block（19）, make tail-hood（4）Cap is turned round in last removal（11）Under the premise of can not move forward.

5. hemostix according to claim 1, it is characterised in that：The needle core（2）Front is equipped with block, and lid is constituted with this Shape for hat head push type disposable blood taking device.

6. hemostix according to claim 1, it is characterised in that：The shell（1）Head, which is equipped with, can change puncture deeply The adjusting head of degree（17）Structure.