CN216455018U - Disposable safety hemostix capable of preventing assembly injury of elastic arm - Google Patents

Abstract

The utility model provides a prevent that elastic arm assembly is injured's disposable safe hemostix, includes nook closing member, transmission spring and shell or tail-hood, its characterized in that: on the circumferencial direction of hemostix cross section to with elastic arm contact complex trigger surface central point as the benchmark, be provided with one in the direction of rotation of central point and step down the passageway, let the elastic arm insert along the passageway degree of depth of stepping down when assembling the nook closing member, can not make elastic arm and trigger surface contact, can make nook closing member afterbody and launching spring front end can reliable buckle be connected simultaneously, then utilize launching spring's elasticity to force the elastic arm to retreat to trigger surface front position along with the nook closing member, it can on same axial displacement route to make the elastic arm reset as long as rotate certain angle at last. This scheme is ingenious has solved the nook closing member degree of depth and has leaded to the injured problem of elastic arm when inserting shell bottom and launching spring front end buckle and being connected.

Description

Disposable safety hemostix capable of preventing assembly injury of elastic arm

Technical Field

The utility model relates to the field of medical blood sampling instruments, in particular to a disposable safety blood sampler (or a blood sampling needle) capable of preventing an elastic arm from being damaged during assembly.

Background

Among medical blood collection devices, disposable safety blood collection devices are popular among medical care personnel and patients due to the characteristics of small volume, safe use and convenient operation, and are widely used in various medical institutions and diabetics at present. The ejection mechanism of the hemostix is compact in structure, safe and convenient, and has strong market development potential, and the hemostix is integrally disposable.

The disposable hemostix products on the market have various structural forms, but the key points are summarized according to the triggering form, the first type is a head pressing type disposable safety hemostix, and the second type is a tail pressing type disposable safety hemostix. Both the head and tail pressing mean whether the member for triggering ejection of the blood collection device is located at the head or the tail of the blood collection device. From the general development trend of the current hemostix products, the market acceptance has been largely changed to be oriented to low product price, simple structure and reliable operation. Among the two types of hemostix products, the head pressing type disposable safety hemostix has simpler structure, lower cost and more market potential.

Head push type disposable safety hemostix includes shell, nook closing member usually, pushes away and sends out ware and transmission spring, and the nook closing member utilizes the elastic arm locking to push away to send out on the ware before the transmission, and the ware that pushes away that presses down the hemostix head during the use drives the nook closing member and moves backward, because the hindrance of the face of triggering on the shell inner wall forces the inward bending deformation of elastic arm, leads to the nook closing member unhook unblock, and the nook closing member launches the blood sampling forward under transmission spring's promotion. It can be seen from the above structure of the blood sampling device and the use process that the design of the elastic arm on the needle core is very important, and not only is the locking and unlocking structure on the needle core, but also the performance of the elastic arm affects the working reliability and the practical use effect of the whole blood sampling device.

On the other hand, in order to ensure that the needle point of the blood sampler is not allowed to be exposed after the blood sampler is used safely, two methods are usually adopted during product design, the first method is to add a buffer spring (the tail part of the needle core is a launching spring) at the front end of the needle core, so that the needle point can be prevented from being exposed after the blood sampler is used, and the second method can be used for preventing secondary puncture. The second mode is to connect the tail of the needle core with the front end of the launching spring in a buckling way, and the needle core is pulled by the launching spring after the hemostix is used, so as to prevent the needle tip from being exposed. Obviously, the second mode saves a buffer spring at the front end of the stylet compared with the first mode, is beneficial to reducing the cost of the product, and increases the assembly requirement of the rear part of the stylet and the front end of the launching spring at the cost that the stylet needs to be deeply inserted into the bottom end of the shell to force the rear part of the stylet to be connected with the front end of the launching spring in a buckling mode in the assembly process. Since the elastic arm on the needle core and the triggering surface on the inner wall of the shell are located on the same axial moving path during normal assembly, the deep insertion of the needle core inevitably causes the triggering surface to seriously interfere with the elastic arm, which causes serious deformation of the elastic arm and even directly causes injury or damage to the elastic arm (see fig. 13). This is something that the engineer would most likely not want to see.

In view of the above, the utility model aims to avoid the damage of the elastic arm when the needle core is inserted into the bottom of the shell and is connected with the front end of the launching spring in the assembly process of the blood collector.

Disclosure of Invention

In view of the defects of the prior art, the utility model provides a disposable safety hemostix for preventing an elastic arm from being damaged during assembly, and aims to solve the problem that the elastic arm is damaged when a needle core is deeply inserted into the bottom of a shell and is connected with the front end of a launching spring in a buckling mode.

In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a prevent that elastic arm assembles injured disposable safety hemostix, includes nook closing member, transmission spring and shell or tail-hood, and the pointed direction of definition hemostix needle point is hemostix the place ahead, wherein:

the rear end of the launching spring is connected with the inner rear end of the shell or the tail cover in a clamping mode.

The front end of the launching spring is connected with the tail part of the needle core in a clamping manner.

The lateral part of nook closing member is equipped with the elastic arm, is equipped with the conflict face on the elastic arm, corresponds the conflict face and is provided with the trigger face on the inner wall of shell or on the tail-hood, should trigger the face and conflict face cooperation and force the elastic arm towards the bending of hemostix inboard, is used for unblock nook closing member.

The method is characterized in that: on the circumferencial direction of hemostix cross section, with the plane of triggering central point on shell or the tail-hood as the benchmark be provided with the injured space of stepping down of elastic arm when being used for avoiding nook closing member cartridge on the direction of rotation of central point, should step down the space and be in the width of circumferencial direction is greater than the conflict face is in the width of circumferencial direction, should step down the space and be in hemostix length direction's the degree of depth is greater than the conflict face to the distance of afterbody card fixed point of nook closing member to this avoids the injured passageway of stepping down of elastic arm when constituting the assembly.

The relevant contents and variations of the above technical solution are explained as follows:

1. in the above scheme, the rearward observation of follow hemostix place ahead, the passageway of stepping down is located the clockwise rotation direction of central point. The abdicating channel is positioned in the rotation direction of 30-90 degrees clockwise from the central point.

2. In the above scheme, the abdicating channel is located on the anticlockwise rotation direction of the central point when the hemostix is observed from the front to the rear. The abdicating channel is positioned in the 30-90-degree anticlockwise rotation direction of the central point.

3. In the above scheme, the elastic arm is an arch bridge type elastic arm, the arch bridge type elastic arm is in an arch bridge shape, two ends of the arch bridge shape are fixedly arranged relative to the needle core, and the bridge top of the arch bridge shape is used as an acting part of the elastic arm. The acting part is provided with a bulge, and the contact surface is a rear end surface of the bulge.

4. In the above scheme, including sending out the ware, be equipped with nook closing member operation spacing track along the hemostix fore-and-aft direction in sending out the ware, be equipped with the guide block on the nook closing member corresponding this nook closing member operation spacing track, the guide block cooperates the direction of launching of restriction nook closing member with nook closing member operation spacing track under assembled state.

The design principle and the effect of the utility model are as follows: in order to solve the problem that the elastic arm is injured when the stylet is deeply inserted into the bottom of the shell and is connected with the front end of the launching spring in a buckling way (see the attached drawing 13), the utility model adopts the following measures: on the circumferencial direction of hemostix cross section to with elastic arm contact complex trigger surface central point as the benchmark, be provided with a channel of stepping down on the direction of rotation of central point, let the elastic arm insert along the channel degree of depth of stepping down when assembling the nook closing member, can not make elastic arm and trigger surface contact, can make nook closing member afterbody and launching spring front end reliably the buckle be connected simultaneously, then utilize launching spring's elasticity to force the elastic arm to retreat to trigger surface front position along with the nook closing member, it can on the same axial displacement route to make the elastic arm reset to be in with the trigger surface as long as rotate certain angle at last. The utility model is characterized in that: firstly, the structure is simple, and the conception is ingenious; secondly, performing secondary drying; the structure design of an original product is not changed, only a special assembly yielding channel is arranged for the elastic arm, then the needle core is assembled by utilizing the yielding channel, and finally the needle core is rotated and reset. The cost is hardly increased, and the effect can be obtained only by improving the original mould at most; third, it is easy to implement from an assembly process perspective.

Drawings

Fig. 1 is an exploded perspective view of a blood collection device according to embodiment 1 of the present invention;

FIG. 2 is a perspective view of a housing according to embodiment 1 of the present invention;

FIG. 3 is a perspective sectional view of a housing according to embodiment 1 of the present invention;

FIG. 4 is a front view of the bottom inside the housing (looking inward from the front end of the housing) according to embodiment 1 of the present invention;

FIG. 5 is a perspective view of a hub in accordance with example 1 of the present invention;

FIG. 6 is an enlarged rear view of the hub of FIG. 5;

FIG. 7 is a front view of a hub of example 1 of the present invention;

fig. 8 is a perspective view of a first perspective of a hair clipper in accordance with embodiment 1 of the present invention;

FIG. 9 is a perspective cross-sectional view of a hair pusher in accordance with embodiment 1 of the present invention;

FIG. 10 is a perspective view of a second perspective of the hair clipper of embodiment 1 of the present invention;

FIG. 11 is a left side view of the hair clipper of embodiment 1 of the present invention;

FIG. 12 is a front view of a hair pushing apparatus in accordance with embodiment 1 of the present invention;

FIG. 13 is a schematic view of the prior art assembly of the present invention, which is prone to cause damage to the flexible arms of the hub;

FIG. 14 is a perspective sectional view of the assembled core and the hair pusher of example 1 of the present invention;

FIG. 15 is a cross-sectional view of the assembled core and the hair pusher of example 1 of the present invention;

FIG. 16 is a perspective sectional view showing the state of the front end of the plunger protecting rod in accordance with embodiment 1 of the present invention;

FIG. 17 is a sectional view showing the state of the front end of the plunger protecting rod in accordance with embodiment 1 of the present invention;

FIG. 18 is a sectional view showing the natural spring-back state of the spring releasing the stylet guard lever of example 1 of the present invention;

FIG. 19 is a schematic view of the condition that the stylet guide rail is bound by the guide rib inside the hair pusher in embodiment 1 of the utility model;

FIG. 20 is a perspective sectional view showing the needle core rotated by the rotary actuator in accordance with the embodiment 1 of the present invention;

FIG. 21 is a sectional view showing a state in which the rotary pusher rotates the hub together in accordance with embodiment 1 of the present invention;

FIG. 22 is a sectional view showing a state in which the hair pusher is pressed in embodiment 1 of the present invention;

FIG. 23 is a sectional view showing the assembled state of the dispenser of embodiment 1 of the present invention after the dispenser is locked with the housing;

FIG. 24 is a perspective view of a twist cap according to example 1 of the present invention;

FIG. 25 is a perspective view showing a state where the twist cap is separated according to embodiment 1 of the present invention;

FIG. 26 is a perspective view of the needle core elastic arm and the trigger surface in a state of being assembled in a staggered manner in accordance with embodiment 2 of the present invention;

FIG. 27 is a sectional view showing the state where the stylet, the discharge spring, and the tail cap are inserted into the housing in a staggered manner in accordance with embodiment 2 of the present invention;

FIG. 28 is a cross-sectional view of FIG. 27 rotated 90 degrees in the axial direction;

FIG. 29 is a perspective view of the needle core elastic arm rotated 90 degrees relative to the trigger surface in an upright position according to embodiment 2 of the present invention;

FIG. 30 is a sectional view of the needle core elastic arm rotated 90 degrees with respect to the trigger surface in the normal state according to embodiment 2 of the present invention;

fig. 31 is a cross-sectional view of fig. 30 rotated 90 degrees in the axial direction.

The reference numerals in the above figures are explained as follows:

1. a housing; 11. locking the salient points; 12. a trigger surface; 13. a spring connecting column; 14. a guide ramp; 15. a sliding platform; 16. a sliding surface; 17. a limiting surface; 2. a needle core; 21. a stopper; 22. a resilient arm; 23. a protrusion; 24. a first blocking surface; 25. a contact surface; 26. a guard bar; 28. a needle body; 29. an impact surface; 3. a hair pusher; 31. a second blocking surface; 32. a third limiting surface; 33. the needle core runs the spacing orbit; 34. puncturing a hole by a needle tip; 36. a first limit surface; 37. a second limiting surface; 38. a notch; 4. a firing spring; 5. a tail cover; 6. a housing; 7. a space of abdicating; 8. twisting the cap; 9. a guide block; 10. a hook.

Detailed Description

The utility model is further described with reference to the following figures and examples:

example 1: disposable safety hemostix (head push type) for preventing elastic arm assembly from being injured

As shown in fig. 1 to 25, the blood sampling device is a head-push type blood sampling device, and includes a housing 1, a needle core 2, a pushing device 3, and a launching spring 4 (see fig. 1), wherein:

the front end of the needle core 2 is provided with a protective rod 26 (see figures 5-7), the protective rod 26 covers the needle point of the head part of the needle body 28, and the joint of the protective rod 26 and the needle core 2 is provided with a breaking part (see figures 5-7), so that the breaking part is broken when the protective rod 26 is screwed. The breaking part may be a necking structure, a notch, a cut mark, or even a sleeving structure sleeved on the stylet 2, and the embodiment of fig. 5 to 7 shows necking.

The lateral part of the needle core 2 is provided with an elastic arm 22 (see fig. 5-7), the elastic arm 22 is provided with a bulge 23 (see fig. 5-7) for locking and unlocking, the direction of the needle point of the hemostix is defined as the front of the hemostix, the front end of the bulge 23 is provided with a first blocking surface 24 (see fig. 7), and the rear end of the bulge 23 is provided with an interference surface 25 (see fig. 7). The corresponding interference surface 25 is provided with a trigger surface 12 (see fig. 3) on the inner wall of the housing 1, and the trigger surface 12 and the interference surface 25 cooperate to force the elastic arm 22 to bend towards the inner side of the blood sampler for unlocking the needle core 2. The triggering surface 12 may be a triggering inclined surface (see fig. 5 and 7), a triggering arc surface, or even a triggering straight surface, but when the triggering surface 12 is a triggering straight surface, the interference surface 25 engaged therewith should be an inclined surface or an arc surface. Theoretically, at least one of the triggering surface 12 and the abutting surface 25 may be an inclined surface or a curved surface.

The first blocking surface 24 faces the front of the blood collector (in the initial assembly state, see fig. 23), a second blocking surface 31 is arranged on the hair pusher 3 corresponding to the first blocking surface 24 (see fig. 8-12), the second blocking surface 31 faces the rear of the blood collector (in the initial assembly state, see fig. 23), and the first blocking surface 24 and the second blocking surface 31 cooperate to limit the forward movement of the needle core 2 relative to the hair pusher 3 and lock the needle core 2 relative to the hair pusher 3 (see fig. 13).

A spring connecting post 13 is arranged at the rear end in the shell 1 (see fig. 3 and 4), and the rear end of the launching spring 4 is clamped and connected with the spring connecting post 13 in an assembling state (see fig. 23). The tail of the stylet 2 is provided with a hook 10 (see fig. 5-7), and the front end of the launching spring 4 is clamped and connected with the tail of the stylet 2 in an assembling state.

The elastic arm 22 is an arch bridge type elastic arm, the arch bridge type elastic arm is in an arch bridge shape (see fig. 7), two ends of the arch bridge shape are fixedly arranged relative to the needle core 2, and the bridge top of the arch bridge shape is used as an acting part of the elastic arm. The acting part is provided with a bulge 23, and the collision surface 25 is the rear end surface of the bulge 23.

In order to solve the problem that leads to the elastic arm 22 injured when 2 degree of depth of nook closing member insert shell 1 bottom and 4 front end buckles of transmission spring are connected on the circumferencial direction of hemostix cross section to 12 central points of trigger face on the shell 1 are the benchmark, are provided with the injured space of stepping down of elastic arm 22 when being used for avoiding the 2 cartridge of nook closing member on the direction of rotation of central point, should step down the space and be in circumferencial direction's width is greater than conflict face 25 is in circumferencial direction's width, should step down the space and be in hemostix length direction's degree of depth is greater than conflict face 25 to the distance of afterbody card fixed point of nook closing member 2 to this avoids the injured passageway of stepping down 7 of elastic arm (see fig. 4) when constituting the assembly.

In this embodiment, the abdicating channel 7 is located in the clockwise rotation direction of the central point when viewed from the front to the rear of the blood collection device. The abdicating channel 7 is located in the 90 degree clockwise rotation direction of the centre point (see figure 4). It is also possible to position the abdicating channel 7 in a counter-clockwise direction of rotation of said centre point. The abdicating channel 7 is positioned in the 90 degree anticlockwise rotation direction of the centre point.

A needle core running limiting track 33 (shown in figures 9-11) is arranged on the inner side of the hair pusher 3 along the front-back direction of the blood collector, a guide block 9 (shown in figure 6) is arranged on the needle core 2 corresponding to the needle core running limiting track 33, and the guide block 9 is matched with the needle core running limiting track 33 to limit the ejection direction of the needle core 2 in an assembly state (shown in figure 19).

The outer side of the hair pusher 3 is provided with a first limiting surface 36 (see fig. 8 and 12), the first limiting surface 36 faces the front of the blood collector (in an initial assembly state, see fig. 23), a locking salient point 11 (see fig. 2 and 3) is arranged on the inner wall of the housing 1 corresponding to the first limiting surface 36, and the locking salient point 11 and the first limiting surface 36 cooperate to limit the forward movement of the hair pusher 3 relative to the housing 1 (see fig. 23).

On the inner wall of the housing 1, a sliding platform 15 (see fig. 3) is provided for the protrusion 23, the front end surface of the sliding platform 15 is a trigger surface 12 (see fig. 3), and the top surface of the sliding platform 15 is a sliding surface 16 (see fig. 3) in the longitudinal direction of the blood collection device. The function and effect of the sliding surface 16 is to ensure that the projection 23 slides along the sliding surface 16 temporarily and rests on the sliding platform 15 during false triggering, and then returns to the initial position immediately (return) under the action of the firing spring 4 once the striking force is removed. The sliding surface 16 is a plane parallel to the ejection direction of the cartridge (see fig. 13).

The guard bar 26 is provided with a stop block 21 (see fig. 5-7), the stop block 21 is provided with a stop and leaning surface (not labeled), the stop and leaning surface is a surface of the stop block 21 facing the front of the blood collector in an initial assembly state, the stop and leaning surface faces the front of the blood collector, a second limit surface 37 (see fig. 9 and 23) is arranged on the inner wall of the hair pusher 3 corresponding to the stop and leaning surface, and the second limit surface 37 is matched with the stop and leaning surface on the stop block 21 to limit the forward movement of the needle core 2 relative to the hair pusher 3 (see fig. 23). The design avoids the occurrence of false triggering through the matching of the second limit surface 37 and the stop block 21 (the stop surface) by utilizing the connection relationship between the protection rod 26 and the ejector 3, namely, under the premise that the protection rod 26 is not detached, no matter the protection rod 26 or the ejector 3 is triggered, the ejection structure of the blood collector cannot be really triggered, and the combined action of the sliding platform 15 and the launching spring 4 is added, so that the bulge 23 on the elastic arm 22 can be recovered to the initial assembly position again after false triggering occurs, and finally, the blood collector can be recovered to the original initial assembly state.

After the stopper 21 is provided on the guard bar 26, in order to solve the problem that the guard bar 26 is easily screwed and removed, a notch 38 (see fig. 8) for the stopper 21 to pass through is provided beside the needlepoint puncture hole 34 of the hair pusher 3 corresponding to the stopper 21 on the guard bar 26, and in an initial assembly state, the notch 38 is located at a rotation position where the stopper 21 rotates along with the guard bar 26. When the rotation guard bar 26 is aligned with the notch 38 at the stopper 21, the broken portion between the guard bar 26 and the needle core 2 is broken, and at this time, the guard bar 26 can be pulled out.

The needle core 2 is provided with an impact surface 29 (see fig. 5-7), the impact surface 29 faces the front of the blood collector, the hair pusher 3 is provided with a third limiting surface 32 (see fig. 9) corresponding to the impact surface 29, the third limiting surface 32 faces the rear of the blood collector (see fig. 13), and the impact surface 29 and the third limiting surface 32 are matched to limit the blood collection puncture depth (see fig. 23) in the launching process of the needle core 2.

The assembly process of the needle core 2 of this embodiment, which is prone to accidental damage to the resilient arm 22, is described as follows:

referring to fig. 13, since the elastic arm 22 of the needle core 2 and the trigger surface 12 on the inner wall of the housing 1 are located on the same axial moving path during normal assembly, the deep insertion of the needle core 2 inevitably causes the trigger surface 12 to interfere with the elastic arm 22 seriously during assembly, which results in serious deformation of the elastic arm 22, resulting in injury or damage to the elastic arm 22, and finally failure of the blood collection device.

The assembly process of the present embodiment of the needle core 2 to avoid the injury of the elastic arm 22 is explained as follows:

1. initial assembled state

Referring to fig. 14-15, wherein fig. 14 shows a perspective cross-sectional view of the core 2 mated with the hair pusher 3 in an initial assembled state, and fig. 15 shows a cross-sectional view of the core 2 mated with the hair pusher 3 in the initial assembled state. In the initial assembly state, the stylet 2 and the hair pusher 3 are sleeved in two parts, and then the elastic arm 22 on the stylet 2 is inserted into the shell 1 in alignment with the abdicating channel 7 until the second blocking surface 31 of the hair pusher 3 is matched with the inner spacing surface 17 of the shell 1, and the hair pusher 3 does not move rightwards any more (see fig. 15).

2. Front end state of pressing needle core protection rod

Referring to fig. 16 to 17, fig. 16 is a perspective sectional view showing a state of pressing the tip of the protection rod 26 of the stylet 2, and fig. 17 is a sectional view showing a state of pressing the tip of the protection rod 26 of the stylet 2. As can be seen from fig. 17, the front end of the protective rod 26 of the needle 2 is pressed (see the arrow in the figure) until the hook 10 at the tail of the stylet 2 hooks with the front end of the launching spring 4 and is squeezed into the launching spring (see fig. 17), and the elastic arm 22 on the stylet 2 is not influenced by the trigger surface 12 because the elastic arm 22 is positioned in the abdicating channel 7 during the pressing process, so that the elastic arm 22 is not deformed (see fig. 17).

3. Spring natural resilience state of release needle core protection rod

Referring to fig. 18, wherein fig. 18 shows a sectional view of the natural rebound of the firing spring 4 upon release of the plunger 2 guard bar 26. It can be seen from figure 18 that the core 2 is released and the firing spring 4 naturally returns, pushing the core 2 and resilient arm 22 to the left to the natural state. At this time, the elastic arm 22 is retracted to a natural state along the receding channel 7. In this condition the resilient arm 22 is retracted with the core 2 to a position forward of the trigger surface 12.

4. The rotary hair-pushing device drives the needle core to rotate together

Referring to fig. 19-21, wherein fig. 19 shows the guide block 9 on the core 2 constrained by the core travel limit track 33 inside the hair pusher 3, the core 2 can only slide back and forth relative to the hair pusher 3, but can rotate with the hair pusher 3. Fig. 20 is a perspective sectional view showing a state where the rotary pusher 3 rotates the core 2, and fig. 21 is a sectional view showing a state where the rotary pusher 3 rotates the core 2. As can be seen in fig. 20 and 21, rotating the plunger 3 (90 °) causes the core 2 to rotate together, while the resilient arms 22 on the core 2 return to the same axial path of movement as the trigger surface 12 inside the housing 1.

5. Pressing the state of the hair-pushing device

Referring to FIG. 22, wherein FIG. 22 shows a cross-sectional view of the pusher being pressed. As can be seen in fig. 22, the pusher 3 is pressed (indicated by the arrow) so that the pusher 3 enters the housing 1.

6. The assembly state of the hair pusher is completed after the hair pusher is locked with the shell

Reference is made to fig. 23, wherein fig. 23 shows a sectional view of the complete assembly state after the locking of the hairdryer 3 with the casing 1. As can be seen from fig. 23, when the hair pusher 3 is pressed and enters the housing 1, the first limit surface 36 on the hair pusher 3 is locked with the locking protrusion 11 on the housing 1 (see fig. 23), and the assembly is completed.

The following description will be made for the structural changes of embodiment 1:

1. in this embodiment, the elastic arm 22 is an arch-bridge type elastic arm structure, and it can be seen from fig. 7 that the elastic arm 22 is arch-shaped, and both ends of the elastic arm are fixedly connected to the stylet 2. The present invention is not so limited and the resilient arm may be of a single cantilever structure, a variation of which will be appreciated and appreciated by those skilled in the art. Compared with the elastic arm with a single cantilever structure, the elastic arm structure with the arch bridge structure has larger elastic force theoretically.

2. In this embodiment, the elastic arm 22 is provided with a protrusion 23, a front end surface of the protrusion 23 is a first blocking surface 24, and a rear end surface of the protrusion 23 is an abutting surface 25 (see fig. 23). The utility model is not limited thereto, for example, the resilient arm 22 is provided with two different protruding structures, the first blocking surface 24 being provided on one of the protruding structures and the interference surface 25 being provided on the other protruding structure. Such a design is also feasible in practice, a variation which can be understood and appreciated by those skilled in the art.

3. In this embodiment, the elastic arm 22 is provided with a protrusion 23. The present invention is not limited thereto and the resilient arm 22 may be formed without the protrusion 23, and the protrusion 23 is not a necessary structure for the present invention. For example, the elastic arm 22 may be designed as a general cantilever structure, and an end surface of the cantilever end may be a first blocking surface 24, and the other side of the end surface of the cantilever end may be an interference surface 25. This is a variation that can be understood and appreciated by those skilled in the art.

4. In this embodiment, the sliding surface 16 is a plane parallel to the ejection direction of the cartridge (see fig. 23). However, the present invention is not limited thereto, and the sliding surface 16 may be a plane surface, but also an inclined surface, and the included angle between the inclined surface and the needle body 28 is not too large. The arc surface can also be a cambered surface, and the curvature radius of the cambered surface is not easy to be too small and is relatively flat.

5. In this embodiment, the interference surface 25 is a slope (see fig. 5 and 7). However, the present invention is not limited thereto, and the abutting surface 25 may be a straight surface or a curved surface. The differences between the straight and the inclined planes are: the former is a plane facing the rear of the blood collection device, and the latter is a plane inclined with respect to the plane.

6. In this embodiment, the housing 1 is an integrally formed structure, the two sides of the rear portion in the housing 1 are provided with guiding inclined planes 14 for guiding the installation of the launching spring 4, and the rear end in the housing 1 is provided with a spring connecting post 13 for clamping and connecting the launching spring 4. The utility model is not so limited and variations such as bayonet or hook configurations may be employed as would be understood and appreciated by those skilled in the art.

7. In this embodiment, the four components of the housing 1, the needle core 2, the hair pusher 3 and the firing spring 4 can be assembled to form an independent blood collection device (see fig. 23). However, considering that the guard bar 26 is thin and inconvenient to operate, a twist cap 8 may be added to the head of the blood collection set, and the twist cap 8 is fitted over the head of the pusher 3 in an initial assembly state (see fig. 24 and 25). A cap can also be added on the head part of the blood collector, and the cap is sleeved on the head part of the hair pusher 3 in an initial assembly state.

Example 2: disposable safety hemostix (Tail push type)

As shown in fig. 26 to 31, the blood sampling device is a push-down type blood sampling device, which includes a housing 6, a needle core 2, a tail cap 5 and a launching spring 4 (see fig. 27), and defines the direction pointed by the needle point of the blood sampling device as the front of the blood sampling device, wherein:

the rear end of the launching spring 4 is connected with the tail cover 5 in a clamping way (the launching spring 4 and the spring connecting column 13 in the figure 27), and the front end of the launching spring 4 is connected with the tail part of the stylet 2 in a clamping way (the launching spring 4 and the clamping hook 10 in the figure 27).

The side of the needle core 2 is provided with an elastic arm 22 (see fig. 27), the elastic arm 22 is provided with an interference surface 25, the tail cap 5 corresponding to the interference surface 25 is provided with a trigger surface 12 (see fig. 28), and the trigger surface 12 and the interference surface 25 cooperate to force the elastic arm 22 to bend towards the inner side of the blood collector for unlocking the needle core 2.

In order to solve the problem that the elastic arm 22 is injured when the needle core 2 is inserted into the tail cap 5 and is connected with the front end buckle of the launching spring 4, on the circumferential direction of the cross section of the blood sampler, the central point of the triggering surface 12 on the tail cap 5 is used as a reference, and a yielding space for avoiding the injury of the elastic arm 22 when the needle core 2 is inserted is arranged in the rotating direction of the central point, wherein the yielding space is used for avoiding the width of the circumferential direction to be greater than the width of the collision surface 25 in the circumferential direction, and the yielding space is used for avoiding the distance from the collision surface 25 of the needle core 2 to the tail clamping point in the depth of the length direction of the blood sampler, so that a yielding channel 7 (see fig. 27) for avoiding the injury of the elastic arm during assembly is formed.

The abdicating channel 7 is positioned in the clockwise rotation direction of the center point when viewed from the front to the rear of the blood collecting device. The abdicating channel 7 is positioned in the clockwise 90 degree rotation direction of the central point. It is also possible that the abdicating channel 7 is located in a counter-clockwise direction of rotation of said centre point. The abdicating channel 7 is positioned in the 90 degree anticlockwise rotation direction of the centre point.

The assembly process of the present embodiment of the core 2 to avoid the injury of the elastic arm 22 is similar to that of embodiment 1. When the stylet 2 is assembled, the elastic arm 22 is inserted into the tail cap 5 along the abdicating channel 7, the elastic arm 22 is not contacted with the trigger surface 12, meanwhile, the tail part of the stylet 2 and the front end of the launching spring 4 can be reliably connected in a buckling way, then the elastic arm 22 is forced to retreat to the front position of the trigger surface 12 along with the stylet 2 by the elasticity of the launching spring 4, and finally, the elastic arm 22 is restored to the same axial moving path with the trigger surface 12 as long as the tail cap 5 or the stylet 2 is rotated by 90 degrees.

Fig. 26-28 show the resilient arms 22 on the hub 2 in a misaligned assembly with the trigger surface 12 on the tail cap 5. Under the state, the elastic arm 22 is inserted into the tail cover 5 along the abdicating channel 7, the elastic arm 22 is not contacted with the trigger surface 12, and the tail part of the stylet 2 and the front end of the launching spring 4 can be reliably buckled and connected. Fig. 29-31 show the resilient arm 22 on the hub 2 rotated 90 degrees to the trigger surface 12. In this state the resilient arm 22 returns to the same axial path of movement as the trigger surface 12.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (8)

1. The utility model provides a prevent that elastic arm assembly is injured's disposable safety hemostix, includes nook closing member (2), transmission spring (4) and shell (1) or tail-hood (5), and the pointed direction of definition hemostix needle point is hemostix the place ahead, wherein:

the rear end of the launching spring (4) is clamped and connected with the inner rear end of the shell (1) or the tail cover (5);

the front end of the launching spring (4) is clamped and connected with the tail part of the needle core (2);

an elastic arm (22) is arranged on the side part of the needle core (2), an abutting surface (25) is arranged on the elastic arm (22), a triggering surface (12) is arranged on the inner wall of the shell (1) or the tail cover (5) corresponding to the abutting surface (25), and the triggering surface (12) is matched with the abutting surface (25) to force the elastic arm (22) to bend towards the inner side of the blood collector so as to unlock the needle core (2);

the method is characterized in that: on the circumferencial direction of hemostix cross section to trigger face (12) central point on shell (1) or tail-hood (5) is the benchmark be provided with the injured space of stepping down of elastic arm (22) when being used for avoiding nook closing member (2) cartridge on the direction of rotation of central point, should step down the space and be in circumferencial direction's width is greater than conflict face (25) are in circumferencial direction's width, should step down the space and be in hemostix length direction's degree of depth is greater than conflict face (25) to the distance of afterbody card fixed point of nook closing member (2) to avoid elastic arm (22) injured passageway of stepping down (7) when this constitutes the assembly.

2. The disposable safety hemostix according to claim 1, wherein: the abdicating channel (7) is positioned on the clockwise rotation direction of the central point when the hemostix is observed from the front to the back of the hemostix.

3. The disposable safety hemostix according to claim 2, wherein: the abdicating channel (7) is positioned in the clockwise 30-90-degree rotation direction of the central point.

4. The disposable safety hemostix according to claim 1, wherein: and when the blood collector is observed from the front to the rear, the abdicating channel (7) is positioned on the anticlockwise rotation direction of the central point.

5. The disposable safety hemostix according to claim 4, wherein: the abdicating channel (7) is positioned in the anticlockwise 30-90-degree rotation direction of the central point.

6. The disposable safety hemostix according to claim 1, wherein: the elastic arm (22) is an arch bridge type elastic arm which is in an arch bridge shape, two ends of the arch bridge shape are fixedly arranged relative to the needle core (2), and the bridge top of the arch bridge shape is used as an acting part of the elastic arm.

7. The disposable safety hemostix according to claim 6, wherein: the acting part is provided with a bulge (23), and the collision surface (25) is the rear end surface of the bulge (23).

8. The disposable safety hemostix according to claim 1, wherein: including pushing away ware (3), push away and send out ware (3) and go up interior syringe needle operation limit track (33) of being equipped with along the hemostix fore-and-aft direction, be equipped with guide block (9) on syringe needle (2) corresponding this syringe needle operation limit track (33), guide block (9) and syringe needle operation limit track (33) cooperation restriction syringe needle (2) launch the direction under the assembled state.

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