CN103989484A - Disposable automatic blood taking needle for preventing second-time puncturing - Google Patents
Disposable automatic blood taking needle for preventing second-time puncturing Download PDFInfo
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- CN103989484A CN103989484A CN201410255592.1A CN201410255592A CN103989484A CN 103989484 A CN103989484 A CN 103989484A CN 201410255592 A CN201410255592 A CN 201410255592A CN 103989484 A CN103989484 A CN 103989484A
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- medial surface
- nook closing
- ejection chamber
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Abstract
A disposable automatic blood taking needle for preventing second-time puncturing comprises a shell body, a needle core and a spring. The needle core and the spring are both arranged in an ejection cavity of the shell body. The needle core is matched with the ejection cavity in a sliding mode. The spring has an effect on the needle core. A triggering button is arranged on the shell body. A clamping lock structure is arranged between the side portion of the needle core and the shell body. The disposable automatic blood taking needle is characterized in that a constraint mechanism for preventing second-time puncturing is arranged between the side portion of the needle core and the inner wall of the shell body or the pushing machine ejection cavity, and the constraint mechanism comprises an elastic hook arranged on the side portion of the needle core and a clamping groove formed in the inner wall of the ejection cavity. According to the disposable automatic blood taking needle, the fact that the two inner side faces of the clamping groove have height difference in the groove-depth direction is used, after the blood taking needle is pressed, the needle core slides forwards quickly under pushing of the spring, at the time, the elastic hook goes over the clamping groove, first-time shooting puncturing is achieved, and during a needle core rebounding process, a hook body of the elastic hook falls into the clamping groove and vibrates back and forth until the needle core stops moving. Due to the fact that the constraint mechanism has the effect on the needle core, second-time puncturing cannot happen.
Description
Technical field
The present invention relates to medical disposable automatic blood-taking needle.This blood taking needle can effectively prevent in blood collection procedure because secondary puncture is to the misery that brought by user.
Background technology
Disposable automatic blood-taking needle refers to the disposable blood taking needle with automatic ejection structure.For many years this class blood taking needle always in update with develop among, current this automatic blood-taking needle moves to maturity just gradually, and becomes the main flow of current medical blood taking device.
Disposable automatic blood-taking needle comprises housing, nook closing member and spring three parts conventionally; wherein; housing forms an ejection chamber; nook closing member and spring are all located in ejection chamber, and spring action, in the rear end of nook closing member, is provided with the needle body with needle point in nook closing member; needle point is positioned at nook closing member front end and cover has a guard bar or protective sleeve; guard bar or protective sleeve stretch out from housing front end, and housing is provided with button, between nook closing member and housing, are provided with latching structure.
Chinese patent CN102028480A discloses a name and has been called " improved safety portable disposable automatic blood-taking needle ", and the application for a patent for invention that application number is 201010596791.0, referring to accompanying drawing 1.As a kind of disposable automatic blood-taking needle with Typical Representative meaning, the technical scheme of this patent application is the safety perspective from using no matter, or the convenience angle using all can be referred to as a Classic couture, this scheme has embodied advanced technology compared with other disposable automatic blood-taking needle in the past, easy and simple to handle, use safe feature.But, from the transmitting of this class blood taking needle to the puncture rule that formed by user, after most disposable automatic blood-taking needles transmittings, to being subject to user all to form repeatedly repeated puncture, observe blood taking needle primary emission through high-speed photography and can reach at most 7 punctures, and puncturing hole position difference repeatedly.This is subject to user to bring stronger pain, or even painful.Accompanying drawing 2-7 has demonstrated above-mentioned patent scheme and after primary emission, has formed the repeatedly process of puncture, wherein, is the process puncturing for the first time primary emission from accompanying drawing 2 to accompanying drawing 7, then arrives between accompanying drawing 7 and repeats at accompanying drawing 5 back, until nook closing member stop motion.Analyze theoretically, when this class blood taking needle transmitting, power spring is freely undue in spring cavity after elastic potential energy discharges, due to the stop motion at once after primary emission of inertia nook closing member, need repeatedly back and forth damped vibration of experience, drive needle point back and forth to puncture, until elastic potential energy is by frictional force approach exhaustion, just stop.
In order to address this problem, in prior art, once someone adopted dual spring measure, used the power spring of a spring as transmitting, used another spring as shock-absorbing spring, when utilizing shock-absorbing spring to cushion after power spring transmitting, thereby reduce back and forth puncture.But the shortcoming that this design brings is: increased parts, caused complex structure, assembling is complicated, and cost is high.In addition the design effect of shock-absorbing spring is also difficult to hold accurately between theory and practice.
For this reason, the present invention improves above-mentioned prior art from preventing that the constraint mechanism angle of secondary puncture from starting with, the deficiency existing to overcome prior art.
Summary of the invention
In view of the shortcoming of above prior art, the invention provides a kind of disposable automatic blood-taking needle that prevents secondary puncture, its objective is and will solve the repeatedly repeated puncture problem that above-mentioned existing disposable automatic blood-taking needle exists.
For achieving the above object, the first technical scheme that the present invention adopts is: a kind of disposable automatic blood-taking needle that prevents secondary puncture, comprise housing, nook closing member and spring, wherein:
Housing forms an ejection chamber, and nook closing member and spring are all located in ejection chamber, and nook closing member and ejection chamber are slidably matched on direction of ejection, and spring acts on nook closing member on direction of ejection; Nook closing member is provided with the needle body with needle point, and needle point is positioned at nook closing member front end; Housing is provided with trigger button, between nook closing member sidepiece and housing, is provided with latching structure.
Its innovation is: between described nook closing member sidepiece and housing ejection chamber inwall, be provided with the constraint mechanism that prevents secondary puncture, this constraint mechanism is made up of the draw-in groove that is located at the elastic hook on nook closing member sidepiece and be located on housing ejection chamber inwall.
Described elastic hook is made up of elastic arm and coupler body, and elastic arm extends back nook closing member sidepiece is oblique, and it is forward curved that coupler body is positioned at arm end and the hook of elastic arm.
The cross section of described draw-in groove on housing fore-and-aft direction is Baltimore groove, the top of this Baltimore groove with respect to ejection chamber rear or/and the inwall projection in front, Baltimore groove has the first medial surface and the second medial surface, the first medial surface is by ejection chamber rear, the second medial surface is by ejection chamber front, in the groove depth direction of Baltimore groove, the height of the first medial surface is greater than the height of the second medial surface, between the inwall at the top of the first medial surface and ejection chamber rear, be connected by the first inclined-plane, between the top of the second medial surface and the inwall in ejection chamber front, be connected by the second inclined-plane; In the groove width direction of Baltimore groove, the first medial surface is greater than one times of corresponding width of coupler body with the distance between the second medial surface, is less than the corresponding width of two times of coupler bodies simultaneously.
For achieving the above object, the second technical scheme that the present invention adopts is: a kind of disposable automatic blood-taking needle that prevents secondary puncture, and comprise sleeve shell, end cap, nook closing member, spring and push away hair device, wherein:
End cap covers in sleeve shell port, thereby end cap stretches out a pair of elastic claw in sleeve shell forms elastic clip, nook closing member is clamped between elastic clip, spring action is on the direction of ejection between nook closing member rear portion and end cap, elastic clip end utilizes grab and chucking power that nook closing member is blocked, and forms latching structure.
Pushing away hair device slip is located in sleeve shell, push away corresponding two elastic claws of hair device and be head-on provided with the inclined-plane or the conical surface that force it to separate to both sides, the hollow space that pushes away hair device is ejection chamber, pushes away hair device front portion and from sleeve shell, stretches out a blood sampling end face, and blood sampling end face central authorities are provided with needle outlet.
Its innovation is: described nook closing member sidepiece and push away between hair device ejection chamber inwall and be provided with the constraint mechanism that prevents secondary puncture, this constraint mechanism forms by being located at the elastic hook on nook closing member sidepiece and being located at the draw-in groove pushing away on hair device ejection chamber inwall.
Described elastic hook is made up of elastic arm and coupler body, and elastic arm extends back nook closing member sidepiece is oblique, and it is forward curved that coupler body is positioned at arm end and the hook of elastic arm.
Described draw-in groove is Baltimore groove in the cross section pushing away on hair device fore-and-aft direction, the top of this Baltimore groove with respect to ejection chamber rear or/and the inwall projection in front, Baltimore groove has the first medial surface and the second medial surface, the first medial surface is by ejection chamber rear, the second medial surface is by ejection chamber front, in the groove depth direction of Baltimore groove, the height of the first medial surface is greater than the height of the second medial surface, between the inwall at the top of the first medial surface and ejection chamber rear, be connected by the first inclined-plane, between the top of the second medial surface and the inwall in ejection chamber front, be connected by the second inclined-plane; In the groove width direction of Baltimore groove, the first medial surface is greater than one times of corresponding width of coupler body with the distance between the second medial surface, is less than the corresponding width of two times of coupler bodies simultaneously.
Related content in above-mentioned the first technical scheme and the second technical scheme is explained as follows:
1. in above-mentioned two schemes, " front " in described " front end ", " forward ", " front and back ", " front " refers to using blood taking needle entirety of the present invention as the direction with reference to needle point indication." afterwards " in described " backward ", " front and back ", " rear ", " rear portion " refers to the opposite direction of " front ".
2. above-mentioned two schemes have all adopted open statement; i.e. " comprising ... ", its reason is may also comprise other structural members for a specific embodiment, such as also comprising in embodiment 1 that guard bar (or claims protective sleeve; safety helmet), and in embodiment 2, also comprise block.
3. in above-mentioned two schemes, described " top of Baltimore groove " refers to the opening of Baltimore groove, if Baltimore groove is inverted opening in diagram, down, Baltimore groove is along putting opening upward.
4. in above-mentioned two schemes, described " the corresponding width of coupler body " refers to the corresponding width of coupler body in Baltimore groove groove width direction.
5. in above-mentioned two schemes, about quantity and the Layout Problem of elastic hook and draw-in groove.In theory the quantity of elastic hook and draw-in groove on same cross section, arrange a pair of, two pairs, three pairs or four pairs, then there is no need more.Every pair is formed by an elastic hook and a draw-in groove corresponding matching.In the present invention, preferably scheme is that described elastic hook and draw-in groove quantitatively form by two pairs, every pair is formed by an elastic hook and a draw-in groove corresponding matching, between the two pairs of elastic hooks and draw-in groove, is arranged symmetrically with taking the centrage of housing or sleeve shell fore-and-aft direction as benchmark.
Design principle of the present invention and effect are: the present invention relates to a kind of disposable automatic blood-taking needle, in order to solve the repeatedly repeated puncture problem that disposable automatic blood-taking needle exists in the past, the present invention is at nook closing member sidepiece and housing or push away between hair device ejection chamber inwall and be provided with the constraint mechanism that prevents secondary puncture, and this constraint mechanism is made up of the draw-in groove that is located at the elastic hook on nook closing member sidepiece and be located on ejection chamber inwall.The present invention utilizes two differences in height that medial surface exists in groove depth direction of draw-in groove, after pressing blood taking needle, nook closing member spring promote under along ejection chamber quick sliding forward, the elastic hook of nook closing member sidepiece is crossed draw-in groove simultaneously, make blood taking needle realize shooting puncture for the first time, but nook closing member coupler body due to elastic hook in springback process fall into draw-in groove, and vibration back and forth in draw-in groove, until nook closing member stop motion, thereby make the relative housing of needle point on nook closing member cannot produce secondary puncture.Feature of the present invention is: the first, and simple in structure, be skillfully constructed; Second; Do not increase other structural members, as long as original mould is improved and can be obtained, almost do not increase cost; The 3rd, observe through high-speed photography, can effectively avoid secondary puncture phenomenon to occur.
Brief description of the drawings
Fig. 1 is existing typical disposable automatic blood-taking needle three-dimensional exploded view;
Fig. 2-7 are existing typical disposable automatic blood-taking needle use procedure exploded view;
Fig. 8 is the embodiment of the present invention 1 three-dimensional exploded view;
Fig. 9 is the embodiment of the present invention 1 upper cover axonometric chart;
Figure 10 is the embodiment of the present invention 1 lower cover axonometric chart;
Figure 11-13 are the partial enlarged drawing of 1 three kinds of states of the embodiment of the present invention;
Figure 14-22 are the embodiment of the present invention 1 use procedure exploded view;
Figure 23 is the embodiment of the present invention 2 three-dimensional exploded views;
Figure 24 is the embodiment of the present invention 2 using state cutaway views;
Figure 25 is constraint mechanism the first cutaway view that the embodiment of the present invention 2 prevents secondary puncture;
Figure 26 is constraint mechanism the second cutaway view that the embodiment of the present invention 2 prevents secondary puncture;
Figure 27 is the constraint mechanism enlarged drawing that the embodiment of the present invention 2 prevents secondary puncture.
Label declaration in above accompanying drawing is as follows:
1. housing; 2. nook closing member; 3. spring; 4. needle body; 5. guard bar; 6. needle outlet; 7. trigger button; 8. upper cover; 9. lower cover; 10. elastic hook; 11. draw-in grooves; 12. first medial surface; 13. second medial surface; 14. first inclined-planes; 15. second inclined-planes; 16. flexure strips; 17. bayonet sockets; 18. sleeve shells; 19. end caps; 20. push away hair device; 21. elastic claws; 22. pick up the ears; 23. grabs; 24. inclined-planes; 25. blood sampling end faces; 26. long feet; 27. gathering sills; 28. guide pads; 29. blocks; 30. test rods.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment 1: a kind of disposable automatic blood-taking needle that prevents secondary puncture
As shown in Fig. 8-Figure 13; this blood taking needle forms (see figure 8) by housing 1, nook closing member 2, spring 3 and guard bar 5; wherein, housing 1 forms (seeing Fig. 9 and Figure 10) by upper cover 8 and lower cover 9 two parts, and two parts connect into overall structure by hole set on contact surface, latch structure.Housing 1 forms an ejection chamber, and nook closing member 2 and spring 3 are all located in ejection chamber, and nook closing member 2 is slidably matched on direction of ejection with ejection chamber, and spring 3 acts on nook closing member 2 on direction of ejection.Nook closing member 2 is provided with the needle body 4 with needle point, and needle point is positioned at nook closing member 2 front ends, and needle point or nook closing member 2 front end sleeves are provided with a guard bar 5, and guard bar 5 stretches out from the needle outlet 6 of housing 1 front end.Between guard bar 5 and nook closing member 2, adopt the thin neck formation that maybe can twist into two parts of socket removably connect (the present embodiment adopt be that the thin cervical region that can twist into two parts is connected).Housing 1 is provided with trigger button 7, between nook closing member 2 sidepieces and housing 1, is provided with latching structure.
In order to solve the repeatedly repeated puncture problem that disposable automatic blood-taking needle exists in the past, the present invention is provided with the constraint mechanism that prevents secondary puncture between nook closing member 2 sidepieces and housing 1 ejection chamber inwall, and this constraint mechanism forms (seeing Fig. 8-Figure 10) by being located at the elastic hook 10 on nook closing member 2 sidepieces and the draw-in groove 11 being located on housing 1 ejection chamber inwall.
Described elastic hook 10 and draw-in groove 11 quantitatively form by two pairs, and every pair is formed by an elastic hook 10 and draw-in groove 11 corresponding matching, between the two pairs of elastic hooks 10 and draw-in groove 11, are arranged symmetrically with (seeing Fig. 8-Figure 13) taking the centrage of housing 1 fore-and-aft direction as benchmark.
Described elastic hook 10 forms (seeing Figure 11-Figure 13) by elastic arm and coupler body, and elastic arm is oblique the extending back of nook closing member 2 sidepieces, and it is forward curved that coupler body is positioned at arm end and the hook of elastic arm.
The cross section of described draw-in groove 11 on housing 1 fore-and-aft direction is Baltimore groove (seeing Figure 11-Figure 13), the top of this Baltimore groove with respect to ejection chamber rear or/and the inwall projection in front, Baltimore groove has the first medial surface 12 and the second medial surface 13, the first medial surface 12 is by ejection chamber rear, the second medial surface 13 is by ejection chamber front, in the groove depth direction of Baltimore groove, the height of the first medial surface 12 is greater than the height of the second medial surface 13, between the inwall at the top of the first medial surface 12 and ejection chamber rear, be connected by the first inclined-plane 14, between the inwall in the top of the second medial surface 13 and ejection chamber front, be connected by the second inclined-plane 15, in the groove width direction of Baltimore groove, the first medial surface 12 is greater than one times of corresponding width of coupler body with the distance between the second medial surface 13, is less than the corresponding width of two times of coupler bodies simultaneously.
The present embodiment use procedure is described below:
The first, original state before using
Figure 14 represents this state.As can be seen from Figure 14, under this state, spring 3 is in the nonelastic potential energy of free state, and the coupler body of elastic hook 10 is positioned at draw-in groove 11 rears in ejection chamber.
The second, pushing guard bar makes the nook closing member state that loads
Figure 15 represents this state.As can be seen from Figure 15,, according to arrow points pushing guard bar 5, force nook closing member 2 to slide backward in ejection chamber.Nook closing member 2 slides backward Compress Spring 3 simultaneously, until flexure strip 16 ends that the bayonet socket 17 on nook closing member 2 is stuck on lower cover 9 enter kayser state.Under this state, nook closing member 2 has loaded, and spring 3 is in compressing the state that saves up strength.
The 3rd, removal guard bar enters battery
Figure 16 represents this state.Concrete operations are: on the basis of above Figure 15, reverse guard bar 5, force guard bar 5 and nook closing member 2 to rupture at thin cervical region place, then pull out guard bar 5, expose needle body 4 and needle point, finally enter the battery shown in Figure 16.
The 4th, press trigger button and enter emission state
Figure 17 represents this state.As can be seen from Figure 17, press trigger button 7, on trigger button 7, directly press flexure strip 16 by presser feet, force flexure strip 16 ends and bayonet socket 17 to break off relations, now, under the promotion of spring 3, nook closing member 2 quick sliding forward, enters emission state.
The 5th, the first stage of emission state
Figure 18 represents this state.As can be seen from Figure 18, under this state, nook closing member 2 is in quick sliding forward, and the coupler body on elastic hook 10 slides and climbs along the first inclined-plane 14, and elastic arm is oppressed and bends by the first inclined-plane 14 simultaneously.
The 6th, the second stage of emission state
Figure 19 represents this state, and Figure 11 is the partial enlarged drawing of this state.From Figure 19 and Figure 11, can find out, nook closing member 2 is still continuing quick sliding forward, and it is other that now relative the first inclined-plane 14 of the coupler body on elastic hook 10 slides into the draw-in groove 11 at top, and now elastic arm is oppressed by the first inclined-plane 14 and the amount maximum that bends.
The 7th, the phase III of emission state
Figure 20 represents this state, and Figure 12 is the partial enlarged drawing of this state.From Figure 20 and Figure 12, can find out, in nook closing member 2 continues forward quick sliding process, because the height of the first medial surface 12 is greater than the height of the second medial surface 13 in the groove depth direction of draw-in groove 11, and the groove width of draw-in groove 11 is less, and (in the groove width direction of Baltimore groove, the first medial surface 12 is greater than one times of corresponding width of coupler body with the distance between the second medial surface 13, be less than the corresponding width of two times of coupler bodies) simultaneously, the elastic arm of elastic hook 10 and coupler body have little time to stretch and fall into draw-in groove 11, but directly cross the second medial surface 13 of draw-in groove 11, continue quick sliding forward, until there is puncture for the first time.
The 8th, nook closing member retracted state after shooting for the first time
Figure 21 represents this state, and Figure 13 is the partial enlarged drawing of this state.From Figure 21 and Figure 13, can find out, under the combined effect of spring 3 and ejection chamber front bulkhead bounce, nook closing member 2 bounces back backward from above-mentioned Figure 20 state.In retraction process, the coupler body of elastic hook 10 slides and climbs along the second inclined-plane 15, and elastic arm is oppressed and bends by the second inclined-plane 15 simultaneously.Because the height of the first medial surface 12 in the groove depth direction at draw-in groove 11 is greater than the height of the second medial surface 13, coupler body is crossed the second medial surface 13, elastic arm stretches, and answers back to the first medial surface 12 simultaneously, and final coupler body is tackled by the first medial surface 12 and fallen into draw-in groove 11.
The 9th, damped vibration state
Figure 22 represents this state.As can be seen from Figure 22,, under this state, elastic hook 10 is hooked and cannot escape by draw-in groove 11.Now, due to inertia and impact force action, nook closing member 2 is along with the coupler body of elastic hook 10 is done back and forth damped vibration (now needle point is away from needle outlet 6) in this short distance region of draw-in groove 11 width, until nook closing member 2 stop motions.As can be seen here, the relative housing 1 of needle point on nook closing member 2 of the present invention can not produce secondary puncture.
Embodiment 2: a kind of disposable automatic blood-taking needle that prevents secondary puncture
As shown in Figure 23-Figure 27, this blood taking needle by sleeve shell 18, end cap 19, nook closing member 2, spring 3, push away hair device 20 and block 29 forms (seeing Figure 23), wherein:
End cap 19 covers in sleeve shell 18 ports, thereby end cap 19 stretches out a pair of elastic claw 21 in sleeve shell 18 forms elastic clip, nook closing member 2 is clamped between elastic clip, spring 3 acts on the direction of ejection between nook closing member 2 rear portions and end cap 19, nook closing member 2 both sides are provided with picks up the ears 22, elastic clip end utilize grab 23 and chucking power by nook closing member 2 both sides pick up the ears 22 block, form latching structure (seeing Figure 24).
Pushing away hair device 20 slides to be located in sleeve shell 18 and (sees Figure 24), push away corresponding two elastic claws 21 of hair device 20 and be head-on provided with the inclined-plane 24 or the conical surface that force it to separate to both sides, the hollow space that pushes away hair device 20 is ejection chamber, push away hair device 20 front portions and from sleeve shell 18, stretch out a blood sampling end face 25, blood sampling end face 25 central authorities are provided with needle outlet 6, push away hair device 20 rear portions and be provided with two long feet 26, long foot 26 inner sides are respectively equipped with gathering sill 27, the guide pad 28 that gathering sill 27 arranges with nook closing member 2 lateral symmetry coordinates to form shoots guide frame, this guide frame and elastic clip structure are decussation and arrange overlooking under state.
Block 29 is enclosed within sleeve shell 18 front portions, and its central authorities establish a test rod 30, and these test rod 30 front ends are provided with a stomidium, and block 29 is under preshot confined state, and test rod 30 inserts needle outlet 6 and stomidium is enclosed within on needle point.
In order to solve the repeatedly repeated puncture problem that disposable automatic blood-taking needle exists in the past, the present invention is at nook closing member 2 sidepieces and push away between hair device 20 ejection chamber inwalls and be provided with the constraint mechanism that prevents secondary puncture, and this constraint mechanism forms (seeing Figure 25 and Figure 26) by being located at the elastic hook 10 on nook closing member 2 sidepieces and being located at the draw-in groove 11 pushing away on hair device 20 ejection chamber inwalls.
Described elastic hook 10 and draw-in groove 11 quantitatively form by two pairs, every pair is formed by an elastic hook 10 and draw-in groove 11 corresponding matching, between the two pairs of elastic hooks 10 and draw-in groove 11, is arranged symmetrically with (seeing Figure 25 and Figure 26) taking the centrage of sleeve shell 18 fore-and-aft directions as benchmark.
Described elastic hook 10 is made up of elastic arm and coupler body, and elastic arm is oblique the extending back of nook closing member 2 sidepieces, and coupler body is positioned at arm end and the hook curved forward (seeing Figure 27) of elastic arm.
Described draw-in groove 11 is Baltimore groove (seeing Figure 27) in the cross section pushing away on hair device 20 fore-and-aft directions, the top of this Baltimore groove with respect to ejection chamber rear or/and the inwall projection in front, Baltimore groove has the first medial surface 12 and the second medial surface 13, the first medial surface 12 is by ejection chamber rear, the second medial surface 13 is by ejection chamber front, in the groove depth direction of Baltimore groove, the height of the first medial surface 12 is greater than the height of the second medial surface 13, between the inwall at the top of the first medial surface 12 and ejection chamber rear, be connected by the first inclined-plane 14, between the inwall in the top of the second medial surface 13 and ejection chamber front, be connected by the second inclined-plane 15, in the groove width direction of Baltimore groove, the first medial surface 12 is greater than one times of corresponding width of coupler body with the distance between the second medial surface 13, is less than the corresponding width of two times of coupler bodies simultaneously.
The present embodiment use procedure is described below: before using, as shown in Figure 25, what two elastic claws 21 on end cap 19 blocked nook closing member 2 by grab picks up the ears 22 to original state, and spring 3 is compressed, and nook closing member 2 is in battery.As long as pull out block 29 when use, pinch sleeve shell 18 with finger the needle outlet 6 that pushes away hair device 20 is aimed to the direct pressing of blood sampling site, now push away hair device 20 try hard to recommend outside moving under along sliding on sleeve shell 18 inner chambers, inclined-plane 24 is pushed two elastic claw 21 ends open to both sides, so grab with pick up the ears 22 to free, spring 3 promotes nook closing member 2 and shoots downwards along guide frame, and needle point penetrates needle outlet 6 and stabs blood sampling site.Nook closing member 2 guide pad 28 in shooting course is obstructed in the time that gathering sill 27 slides into lower end position, and spring 3 drives again nook closing member 2 to bounce back.
Break off relations and start until nook closing member 2 stop motions from nook closing member 2, the implementation Process example 2 occurring during this is identical with the 5th step to the nine steps of use procedure description in embodiment 1.Those skilled in the art are on the basis of Figure 27, and the 5th step to the nine step contents that use procedure is described in 1 in conjunction with the embodiments can imagine that secondary puncture can not occur embodiment 2 completely.Therefore be no longer repeated in this description here.
Be explained as follows for performance of the present invention below:
The first, embodiment 1 is with Chinese patent CN102028480A, and name is called " improved safety portable disposable automatic blood-taking needle ", and the application for a patent for invention technical scheme that application number is 201010596791.0 is improved and obtained for basis.Embodiment 2 is with Chinese patent CN2619583Y, and name is called " self-locking type disposable safe automatic blood-taking needle ", and the utility model patent technical scheme that the patent No. is 03221437.5 is improved and obtained for basis.This two blood taking needle has typicality in disposable automatic blood-taking needle.Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that spirit is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Elastic hook 10 and the draw-in groove 11 in second, embodiment 1 and embodiment 2, described are quantitatively arranged symmetrically with formation by two pairs.But the quantity of elastic hook 10 and draw-in groove 11 is at least one pair of in theory, every pair is formed by an elastic hook and a draw-in groove corresponding matching.In other words, on same cross section, arrange a pair of, three pairs or four pairs all can realize the present invention and obtain same or analogous technique effect.Adopting two pairs of elastic hooks 10 and draw-in groove 11, and be arranged symmetrically with and more consider stressed harmony and the reliability of mechanism, is the better implementation of the present invention.Those skilled in the art are that appearance is intelligible for these contents.
Claims (4)
1. prevent a disposable automatic blood-taking needle for secondary puncture, comprise housing (1), nook closing member (2) and spring (3), wherein:
Housing (1) forms an ejection chamber, and nook closing member (2) and spring (3) are all located in ejection chamber, and nook closing member (2) is slidably matched on direction of ejection with ejection chamber, and spring (3) acts on nook closing member (2) on direction of ejection; Nook closing member (2) is provided with the needle body (4) with needle point, and needle point is positioned at nook closing member (2) front end; Housing (1) is provided with trigger button (7), between nook closing member (2) sidepiece and housing (1), is provided with latching structure;
It is characterized in that: between described nook closing member (2) sidepiece and housing (1) ejection chamber inwall, be provided with the constraint mechanism that prevents secondary puncture, this constraint mechanism is made up of the draw-in groove (11) that is located at the elastic hook (10) on nook closing member (2) sidepiece and be located on housing (1) ejection chamber inwall;
Described elastic hook (10) is made up of elastic arm and coupler body, and elastic arm is oblique the extending back of nook closing member (2) sidepiece, and it is forward curved that coupler body is positioned at arm end and the hook of elastic arm;
The cross section of described draw-in groove (11) on housing (1) fore-and-aft direction is Baltimore groove, the top of this Baltimore groove with respect to ejection chamber rear or/and the inwall projection in front, Baltimore groove has the first medial surface (12) and the second medial surface (13), the first medial surface (12) is by ejection chamber rear, the second medial surface (13) is by ejection chamber front, in the groove depth direction of Baltimore groove, the height of the first medial surface (12) is greater than the height of the second medial surface (13), between the top of the first medial surface (12) and the inwall at ejection chamber rear, be connected by the first inclined-plane (14), between the top of the second medial surface (13) and the inwall in ejection chamber front, be connected by the second inclined-plane (15), in the groove width direction of Baltimore groove, the first medial surface (12) is greater than one times of corresponding width of coupler body with the distance between the second medial surface (13), is less than the corresponding width of two times of coupler bodies simultaneously.
2. disposable automatic blood-taking needle according to claim 1, it is characterized in that: described elastic hook (10) and draw-in groove (11) quantitatively form by two pairs, every pair is formed by an elastic hook (10) and a draw-in groove (11) corresponding matching, between two pairs of elastic hooks (10) and draw-in groove (11), is arranged symmetrically with taking the centrage of housing (1) fore-and-aft direction as benchmark.
3. prevent a disposable automatic blood-taking needle for secondary puncture, comprise sleeve shell (18), end cap (19), nook closing member (2), spring (3) and push away hair device (20), wherein:
End cap (19) covers in sleeve shell (18) port, end cap (19) stretches out a pair of elastic claw (21) thereby forms elastic clip in sleeve shell (18), nook closing member (2) is clamped between elastic clip, spring (3) acts on the direction of ejection between nook closing member (2) rear portion and end cap (19), elastic clip end utilizes grab (23) and chucking power that nook closing member (2) is blocked, and forms latching structure;
Pushing away hair device (20) slip is located in sleeve shell (18), push away corresponding two elastic claws of hair device (20) (21) and be head-on provided with the inclined-plane (24) or the conical surface that force it to separate to both sides, the hollow space that pushes away hair device (20) is ejection chamber, push away the anterior blood sampling end face (25) that stretches out from sleeve shell (18) of hair device (20), blood sampling end face (25) central authorities are provided with needle outlet (6);
It is characterized in that: described nook closing member (2) sidepiece and push away between hair device (20) ejection chamber inwall and be provided with the constraint mechanism that prevents secondary puncture, this constraint mechanism forms by being located at the elastic hook (10) on nook closing member (2) sidepiece and being located at the draw-in groove (11) pushing away on hair device (20) ejection chamber inwall;
Described elastic hook (10) is made up of elastic arm and coupler body, and elastic arm is oblique the extending back of nook closing member (2) sidepiece, and it is forward curved that coupler body is positioned at arm end and the hook of elastic arm;
Described draw-in groove (11) is Baltimore groove in the cross section pushing away on hair device (20) fore-and-aft direction, the top of this Baltimore groove with respect to ejection chamber rear or/and the inwall projection in front, Baltimore groove has the first medial surface (12) and the second medial surface (13), the first medial surface (12) is by ejection chamber rear, the second medial surface (13) is by ejection chamber front, in the groove depth direction of Baltimore groove, the height of the first medial surface (12) is greater than the height of the second medial surface (13), between the top of the first medial surface (12) and the inwall at ejection chamber rear, be connected by the first inclined-plane (14), between the top of the second medial surface (13) and the inwall in ejection chamber front, be connected by the second inclined-plane (15), in the groove width direction of Baltimore groove, the first medial surface (12) is greater than one times of corresponding width of coupler body with the distance between the second medial surface (13), is less than the corresponding width of two times of coupler bodies simultaneously.
4. disposable automatic blood-taking needle according to claim 3, it is characterized in that: described elastic hook (10) and draw-in groove (11) quantitatively form by two pairs, every pair is formed by an elastic hook (10) and a draw-in groove (11) corresponding matching, between two pairs of elastic hooks (10) and draw-in groove (11), is arranged symmetrically with taking the centrage of sleeve shell (18) fore-and-aft direction as benchmark.
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| CN201410255592.1A CN103989484B (en) | 2014-06-10 | 2014-06-10 | Prevent the disposable automatic blood-taking needle of secondary puncture |
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| CN201410255592.1A CN103989484B (en) | 2014-06-10 | 2014-06-10 | Prevent the disposable automatic blood-taking needle of secondary puncture |
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| CN103989484B CN103989484B (en) | 2015-10-28 |
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| CN106419934A (en) * | 2016-11-08 | 2017-02-22 | 苏州施莱医疗器械有限公司 | Disposable hemostix capable of preventing secondary puncturing |
| CN106769624A (en) * | 2016-11-30 | 2017-05-31 | 常州大学 | Bituminous coal caking index the resonance method determines device |
| CN111214246A (en) * | 2019-09-26 | 2020-06-02 | 天津华鸿科技股份有限公司 | Blood taking pen and needle seat for blood taking needle |
| CN113476044A (en) * | 2021-07-02 | 2021-10-08 | 天津云帆医疗器械有限公司 | Safety blood taking needle |
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