CN115040125B

CN115040125B - A tail-pressing blood collector using a process shrapnel lock

Info

Publication number: CN115040125B
Application number: CN202210711681.7A
Authority: CN
Inventors: 施国平; 王祥生; 张金权
Original assignee: Sterilance Medical Suzhou Inc
Current assignee: Sterilance Medical Suzhou Inc
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2024-11-15
Anticipated expiration: 2042-06-22
Also published as: CN115040125A

Abstract

The utility model provides an afterbody push type hemostix that adopts technology shell fragment to lock, includes shell, nook closing member, firing spring and tail cap, its characterized in that: the locking spring is arranged on the side part of the shell for the locking lug on the needle core, and has two flat and one bending states relative to the shell around the locking spring, wherein: the locking spring piece is in a first flat state when the shell is injection molded so as to avoid a mold drawing process channel during injection molding; the locking spring plate is extruded and turned inwards and turned over from a first flat state to a bending state before assembling the needle core, and a locking protrusion is formed; when the tail cover is pressed, the unlocking part on the tail cover extrudes the locking elastic piece and forces the locking elastic piece to turn outwards, and the locking elastic piece is converted into a second flat state from a bending state, so that the needle core is released to produce puncture shooting. The scheme greatly reduces the design and manufacturing difficulty of the die, simplifies the die structure, and improves the product quality and reliability.

Description

Tail push type hemostix locked by technical spring plate

Technical Field

The invention relates to the field of medical blood sampling devices, in particular to a tail pressing type disposable blood sampling device locked by a process elastic piece. The hemostix is characterized in that the needle core is locked by a process elastic sheet formed by simple process processing after injection molding, so that the difficulty of a die is greatly reduced, and the quality and reliability of a product are improved.

Background

Among the medical hemostix, the disposable hemostix is popular with medical staff and patients because of its small volume, safe use and convenient operation, and is currently used in a large amount in various medical institutions and diabetics. The hemostix is provided with the ejection mechanism, has compact structure and is integrally disposable, safe and convenient, and therefore has strong market development potential.

Chinese patent CN108186029a discloses an invention patent application with the patent application number 201810157218.6, named "tail pressing type disposable safety hemostix". This application gives the following information as prior art in the present case: firstly, a basic structure of a representative tail push type hemostix is structurally shown, namely a classical structure consisting of a shell, a needle core, a transmitting spring and a tail cover; secondly, in order to solve the problem that the hemostix cannot be reused, the following technical measures are adopted: 1. an active locking part for locking is arranged on the tail cover, and a passive locking part is arranged on the elastic arm of the shell correspondingly; 2. the positions and the matching time of the active locking part and the passive locking part are correlated with the positions and the matching time of the active unlocking part and the passive unlocking part to generate a specified time sequence relation, so that the condition that the active locking part and the passive locking part are matched after the active unlocking part and the passive unlocking part are matched in time is met. When the tail cover is pressed during use, the needle core is forced to be unlocked firstly, puncture is launched, and then the tail cover and the elastic arm on the shell enter a locking hook state and cannot be reused.

In theory, the innovation point of the patent application is outstanding, the structural characteristics are clear, the safety is high, the user experience is good, the tail cover is permanently locked on the elastic arm of the shell after the tail cover is used, the safety of disposable use is ensured, and the tail cover can be visually identified from the appearance to present an obvious retraction state at the tail of the shell after the tail cover is used. However, the technical proposal of the patent has the greatest defects from the viewpoint of the manufacturing process: firstly, the injection mold has complex structure, large design and manufacturing difficulty and high cost; secondly, because the shell and the tail cover have fine structures and high precision requirements, the quality of injection molding products is unstable, and the reliability in use is low.

Therefore, how to improve the existing design, so that the design and manufacturing difficulty of the die can be reduced, and the requirements of stable and reliable product quality can be met, is the problem to be solved by the invention.

Disclosure of Invention

The invention provides a tail push type hemostix locked by a technical elastic sheet, and aims to solve the problems that an existing tail push type hemostix is complex in injection mold structure, high in design and manufacturing difficulty, unstable in injection product quality and low in reliability in use.

In order to achieve the above purpose, the invention adopts the following technical scheme: a tail push type hemostix locked by a technical elastic sheet comprises a shell, a needle core, a transmitting spring and a tail cover.

The shell is internally provided with an ejection cavity, the needle core is positioned in the ejection cavity, the tail cover is arranged at the tail part of the shell, and the tail cover is connected with the needle core through the ejection spring.

The side part of the needle core is provided with a locking lug for locking, a locking spring plate is arranged on the shell corresponding to the locking lug, and an unlocking part is arranged on the tail cover corresponding to the locking spring plate.

The innovation is that: the locking shrapnel is a sheet-shaped body, the sheet-shaped body is an integral extending structure of the side part of the shell, the locking shrapnel has two flat and one bending states relative to the shell body around the locking shrapnel, wherein:

The locking spring piece is in a first flat state when the shell is injection molded, and the locking spring piece and the shell body around the locking spring piece are in a smooth state in the first flat state so as to avoid a mold drawing process channel during injection molding.

The locking spring plate is extruded and turned inwards to change from a first flat state to a bending state before assembling the needle core, the locking spring plate occupies the drawing process channel position in the bending state, a locking protrusion is formed on the side part of the ejection cavity, and the locking protrusion is matched with the locking protrusion on the side surface of the needle core under the action of the emission spring to enable the needle core to be in a locking state to be emitted.

When the tail cover is pressed, the unlocking part moves forwards along with the tail cover, the acting end of the unlocking part extrudes the locking elastic piece and forces the locking elastic piece to turn outwards, the locking elastic piece is converted into a second flat state from a bending state, the locking elastic piece is separated from the locking convex block in the second flat state, and the needle core is launched under the action of the launching spring.

The relevant contents and changes of the technical scheme are explained as follows:

1. In the above scheme, the shell, the needle core, the emission spring and the tail cover are basic structures of the tail pressing type disposable hemostix, and the basic functions and actions of the tail pressing type disposable hemostix are all in the prior art.

2. In the above-mentioned scheme, the "front" in the "forward" refers to the direction in which the needle tip in the hemostix is pointed.

3. In the above scheme, the "flat state" refers to a state in which the locking spring piece is used as a part of the shell structure, the locking spring piece and other shells around the locking spring piece are kept in a smooth state which is favorable for injection molding and demolding from the angles of mold design and injection molding process, and the "bending state" refers to a bending state obtained after extrusion deformation is performed on the locking spring piece on the basis of the "flat state". The "mold drawing process channel" refers to a path or channel required for demolding a part in an injection molding process, which is a problem that one skilled in the art needs to consider in designing injection molded type part products.

4. In the above-described aspect, the "inward turning" means turning in a direction toward the central axis of the blood collection device with respect to the body itself, and the "outward turning" means turning in a direction away from the central axis of the blood collection device with respect to the body itself.

5. In the scheme, the shell head can be additionally provided with an adjusting head structure, so that the puncture depth can be adjusted. This does not affect the achievement of the object of the present invention.

6. The invention relates to a tail push type hemostix which comprises a twisting cap type structure and a cap type structure. Namely, the disposable hemostix of the invention is usually provided with a protective cap, and the structural form of the protective cap can be a twist cap type or a cap type. This does not affect the achievement of the object of the present invention.

6. In the above scheme, the action end of the unlocking part is provided with a triggering inclined plane facing to the outer side, and the tail cover is pressed to enable the triggering inclined plane to press the locking elastic sheet to abut against the inner wall of the tail cover after the needle core is launched, so that the tail cover is stopped at the retracted position of the tail part of the shell.

7. In the scheme, before the needle core is assembled, the locking elastic sheet is extruded by the process inclined plane or the process curved surface and turns inwards in a side-turning manner, and the process inclined plane or the process curved surface faces inwards.

8. In the above scheme, the side of the locking spring is provided with the positioning clamping block, the positioning clamping block is provided with the positioning clamping strip, the positioning clamping strip is parallel to the locking spring at a distance, and the side of the positioning clamping block is in pressing contact with the side of the positioning clamping strip when the locking spring is in a bending state, so that the locking spring is kept in the bending state. Further is: the end of the locking elastic piece is provided with a bending section, the positioning clamping block is arranged on the side part of the bending section, the positioning clamping block is separated from the side surface of the positioning clamping strip in the first flat state and the second flat state of the locking elastic piece, and the positioning clamping block is in abutting contact with the side surface of the positioning clamping strip in the bending state.

9. In the above scheme, the lateral part of nook closing member is equipped with prevents the secondary and punctures the lug, and this prevents the position of secondary puncture lug on the nook closing member cross section and locks the lug and be 90 degrees and arrange, is equipped with on the tail-hood corresponding to the position of preventing the secondary and punctures the lug, prevents the secondary and punctures the lug at preventing the slip friction of secondary puncture shell fragment surface at nook closing member rebound in-process to this buffering nook closing member kinetic energy.

10. In the above scheme, the needle core lateral part is equipped with rotatory stopper, is equipped with the guide way on the inner wall of corresponding this rotatory stopper shell, and rotatory stopper is located the guide way under the assembled state.

The design principle, technical conception and effect of the invention are as follows: in order to solve the problems that the existing injection mold of the tail pressing type hemostix is complex in structure, high in design and manufacturing difficulty, unstable in quality of injection products and low in reliability in use, the invention is beneficial to simplifying the mold structure, reducing the mold design and manufacturing difficulty, being beneficial to improving the injection quality of products and improving the original design in terms of ensuring the use reliability by the following points:

First, the long and large elastic arm (see the long and large arm length of the elastic arm in the comparison document) on the original hemostix shell is improved into a relatively small technological spring plate structure. The process elastic piece can not be directly used, but is much shorter than the traditional elastic arm, and the process elastic piece and a shell around the process elastic piece are in a smooth state during the injection molding of the shell, so that the design and manufacturing difficulty of a die can be greatly reduced, and the die structure is simplified. However, if the elastic arm in the comparison document is made small, the elastic distance cannot be ensured due to direct use. It is therefore not theoretically possible to make the spring arms short in accordance with the design concept in the comparison document.

Secondly, the process elastic sheet formed by direct injection molding can not be directly used, and special extrusion bending treatment is needed to be carried out on the process elastic sheet before the needle core is assembled, so that the process elastic sheet turns inwards to form a bending state. In the bending state, the process elastic sheet occupies the position of the drawing process channel, and a locking protrusion is formed on the side part of the ejection cavity, but the demolding is finished at this time, so that the demolding is not influenced.

Thirdly, although the technical elastic sheet provided by the invention can be used only by extrusion deformation after injection molding, the technical elastic sheet has the advantages that the design and manufacturing difficulty of a die is reduced, the die structure is simplified, and the positive effects brought by improving the quality and the reliability of a product are difficult to expect in advance. In contrast, the addition of a press bending process is readily available, especially on an automated assembly line.

Fourth, it is not difficult to provide a locking protrusion on an object from the standpoint of structural design and injection molding process, if such a locking protrusion (a catch on an elastic arm in the reference) is to be provided on the inner wall of the cylindrical member, and is also to be located on the elastic arm. One is that the locking projections occupy the drawing process channels of the cylindrical member and present difficulties in demolding after injection molding, and the mold is necessarily complicated in order to solve the problem of demolding. Even if such locking projections cannot be designed to be large, the very small locking projections also reduce the reliability of locking, so that it is difficult to ensure the quality of the injection-molded product. Secondly, to ensure the reliability of the locking protrusion in the locked and unlocked state, the locking protrusion should have a sufficient displacement between the locked and unlocked states, and the only way to ensure such displacement is to design the elastic arm to be longer, and the longer elastic arm must make the elastic arm wider and thicker in order to ensure the elasticity and strength. This is why the elastic arms are large and long in the prior art (in this case the reference). The invention can convert the original long and large elastic arm and the smaller clamping hook (see the elastic arm and the clamping hook arranged on the elastic arm in the comparison document) into a smaller technical spring plate structure by adding one extrusion bending treatment, thus greatly improving the complexity of the die, the design and manufacturing difficulty and the injection molding process, greatly improving the reliability of the locking protrusion and ensuring the product quality. The effects brought about by the present invention are remarkable and have non-obvious and substantive characteristics to those skilled in the art, as it can be seen.

Fifth, in the process of launching, the process elastic sheet which turns inwards to be in a bending state only needs to be reversely extruded by the unlocking part arranged on the tail cover, so that the needle core can be released under the action of the launching spring after the process elastic sheet turns outwards to return to the original flat state, and shooting puncture is generated. It can be seen that this is also relatively easy to achieve.

In conclusion, the invention has the advantages of ingenious technical conception, reasonable design, obvious effect and difficult to expect in advance, and therefore, the invention has outstanding substantive characteristics and obvious progress compared with the prior art.

Drawings

FIG. 1 is an exploded perspective view of an embodiment of the lancing device of the present invention;

FIG. 2 is a perspective view of a rear cover of an embodiment of the lancing device according to the present invention;

FIG. 3is a perspective view of a cartridge of an embodiment of the lancing device according to the present invention;

FIG. 4 is a perspective view of the first view locking tab of the housing of the lancing device according to the present invention before compression deformation;

FIG. 5 is a perspective view of the second view locking tab of the lancing device according to the present invention before compression deformation;

FIG. 6 is a perspective view of the second view locking tab of the lancing device according to the present invention after compression deformation;

FIG. 7 is a front view of the latch tab in the housing of the lancing device according to the present invention after compression;

FIG. 8 is a schematic view of a locking tab in a housing of an embodiment of the lancing device according to the present invention prior to extrusion;

FIG. 9 is a schematic view of the embodiment of the invention after extrusion of the locking spring in the housing;

FIG. 10 is a front view of the embodiment of the lancing device according to the present invention after the compression deformation of the locking spring in the housing;

FIG. 11 is a perspective view showing an initial state of the blood collector according to the embodiment of the present invention;

FIG. 12 is a sectional view showing an initial state of an embodiment of the blood collector of the present invention;

FIG. 13 is a perspective view showing a state in which a torsion handle of a needle core is twisted off according to the embodiment of the blood collector of the present invention;

FIG. 14 is a sectional view showing a state in which a torsion handle of a needle core is twisted off according to the embodiment of the blood collecting apparatus of the present invention;

FIG. 15 shows an embodiment of the blood collector of the present invention pressing the tail cover state front view;

FIG. 16 shows an embodiment of the blood collector of the present invention a cross section of the tail cover is pressed;

FIG. 17 is a perspective view of an embodiment of the lancing device according to the present invention in an emitted state;

FIG. 18 is a cross-sectional view of an embodiment of the lancing device according to the present invention in an fired state;

FIG. 19 is a perspective view showing a state after lancing according to the embodiment of the lancing device of the present invention;

FIG. 20 is a cross-sectional view showing a lancing state of an embodiment of the lancing device according to the present invention;

FIG. 21 is a cross-sectional view of an embodiment of the lancing device according to the present invention in a post-use condition.

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

1. A housing; 2. a needle core; 3. a firing spring; 4. a tail cover; 5. locking the buckle; 6. triggering an inclined plane; 7. a spring piece for preventing secondary puncture; 8. the secondary puncture preventing convex block; 9. a locking projection; a stop block; 11. a torsion handle; 12. a rotary limiting block; 13. a locking spring plate; 14. positioning a clamping block; 15. positioning the clamping strips; 16. assembling a jig; 17. an unlocking part; 18. drawing a mold process channel; 19. a process inclined plane; 20. a guide groove.

Detailed Description

The invention is further described below with reference to the accompanying drawings and examples:

examples: tail push type hemostix locked by technical spring plate

Since the structure, construction and parts of the tail push type hemostix of the present invention have symmetry with respect to the central axis of the hemostix, only half of the symmetry will be described in the following description, and one skilled in the art can understand the structure and operation principle of the other half through the symmetry principle according to the illustration of the present invention.

As shown in fig. 1 to 21, the tail push type hemostix is composed of a housing 1, a needle core 2, a firing spring 3 and a tail cap 4 (see fig. 1).

The shell 1 is internally provided with an ejection cavity, the front end of the ejection cavity is provided with an ejection needle hole (see fig. 11 and 12), the needle core 2 is positioned in the ejection cavity (see fig. 12), the tail cover 4 is arranged at the tail part of the shell 1, and the tail cover 4 is connected with the needle core 2 through the ejection spring 3 (see fig. 12).

The needle core 2 and the torsion handle 11 are integrated into a whole (see fig. 3), so that the torsion handle type tail pressing type disposable hemostix is formed. The torsion handle 11 is located at the front part of the needle core 2 and is connected with the needle core 2 into an integral injection molding structure, the torsion handle 11 is formed by fixedly connecting a torsion part and a protection rod, and a twisting-off shrinkage neck (not labeled in the figure) is arranged between the protection rod and the needle core 2. The side of the needle core 2 is provided with a locking lug 9 (see fig. 3), a locking spring 13 (see fig. 4-6) is arranged on the shell 1 corresponding to the locking lug 9, and four unlocking parts 17 (see fig. 2) are arranged on the tail cover 4 corresponding to the locking spring 13. The active end of the unlocking part 17 is provided with an outwardly directed trigger ramp 6 (see fig. 2 and 12). The four unlocking parts 17 and the triggering ramps 6 can not only be used for unlocking, but also for holding the tail cap 4 in the retracted position at the rear of the housing 1 after firing (the working principle of which will be described in detail later on in the course of the working process). A stop 10 (see fig. 3) is provided between the torsion part of the torsion bar 11 and the protective bar, which stop 10 in the initial assembled state serves to prevent false fires (the working principle of which will be described in detail later on in the course of the working process).

The tail cover 4 (see fig. 2) is mounted at the tail part of the shell 1 (see fig. 11 and 12) in an assembled state, the tail cover 4 and the shell 1 are in sliding connection in the axial direction of the hemostix, and the tail cover 4 is provided with a limit at the rear end of the shell 1 in the sliding direction. As can be seen from fig. 12, the tail cap 4 is provided with a locking catch 5 (also seen from fig. 2 and 11) on top of each other. In the state to be emitted, the rear end of the spring 3 is propped against the tail cover 4, the locking buckle 5 is hooked on the rear end face of the shell 1, and the tail cover 4 is forced to be in a rear end limiting position in the sliding direction relative to the shell 1.

The locking spring 13 is a sheet-like body (see fig. 7), which is an integral extension structure of the side portion of the housing 1, and the locking spring 13 has two flat and one bent states relative to the housing 1 around itself, wherein:

the locking spring 13 is in a first flat state (see fig. 7, 4 and 5) during injection molding of the housing 1, and the locking spring 13 and the housing 1 around itself are in a smooth state (see fig. 7) during the first flat state so as to avoid the mold drawing process channel 18 (see fig. 7) during injection molding.

The locking spring 13 is pressed and turned over inwards before the assembly of the needle core 2, from a first flat state to a bent state (see fig. 8, 9 and 6). As can be seen from fig. 8 and 9, the assembly jig 16 is pressed down to cause the locking spring 13 to bend and deform inward, and finally the locking spring 13 is in an inward bending state (see fig. 10). In this embodiment, the locking spring 13 is pressed by the process inclined surface 19or the process curved surface and turns inwards over before the assembling of the core 2, the process inclined surface 19or the process curved surface facing inwards. The process inclined surface 19or the process curved surface is arranged on an assembly jig 16, and the assembly jig 16 is a fixture on automatic assembly line. In the folded state, the locking spring 13 occupies the position of the drawing process channel 18 and forms a locking protrusion at the side of the ejection cavity (see fig. 10), and under the action of the firing spring 3, the locking protrusion cooperates with the locking lug 9 at the side of the needle core 2 to enable the needle core 2 to be in a locked state to be fired (see fig. 11 and 12).

The unlocking part 17 moves forward along with the tail cap 4 when the tail cap 4 is pressed, the acting end of the unlocking part 17 presses the locking spring 13 and forces the locking spring 13 to turn outwards, the state is changed into a second flat state (see fig. 15 and 16) from the bending state, the locking spring 13 is separated from the locking projection 9 in the second flat state, and the needle core 2 is launched under the action of the launching spring 3 (see fig. 17 and 18).

In the previous description of the embodiments of the present invention, the locking spring 13 is also referred to as a craft spring, which is theoretically equivalent to the action and effect of the resilient arm and the catch in the prior art (the reference in the background). The locking spring 13 (process spring) of the present invention is also provided on the housing 1, but the locking spring 13 is not directly usable at the time of injection molding, and no locking protrusion is formed, and at this time, the locking spring 13 is in the first flat state, and the function is only equivalent to the elastic arm function in the prior art (reference document), but does not have the locking function of the hook (because no locking protrusion is formed at this time). The function of the elastic arm and the hook together in the prior art (reference document) is equivalent only when the locking spring 13 (technical spring) is pressed and deformed into a locking protrusion after being turned inwards. Therefore, the locking spring piece 13 in the invention is just a spring piece brought by an injection molding process when in initial injection molding, and the elastic bulge with the locking and unlocking functions is really provided only by extrusion and inward overturning at the later stage. This is an essential distinction between the present invention and the prior art.

In this embodiment, in order to enable the locking spring 13 on the housing 1 to be positioned without springback after being pressed and turned over inwards, the following structure is also designed: a positioning clamping block 14 is arranged beside the locking spring 13 (before bending in fig. 4 and 5, after bending in fig. 6), a positioning clamping strip 15 is arranged for the positioning clamping block 14, the positioning clamping strip 15 is parallel to the locking spring 13 at a distance (see fig. 4-5), and the positioning clamping block 14 is in contact with the side surface of the positioning clamping strip 15 in a bending state of the locking spring 13 (see fig. 6), namely, the positioning clamping block 14 and the side surface of the positioning clamping strip 15 interfere with each other, so that the locking spring 13 is kept in the bending state.

In this embodiment, in order to make the positioning block 14 and the positioning block strip 15 have a certain distance before the locking spring 13 is bent, a bend is provided at the end of the locking spring 13 (see fig. 5 for clarity), the positioning block 14 is provided at the side of the bending section, the positioning block 14 is spaced from the side of the positioning block strip 15 in the first flat state and the second flat state of the locking spring 13, and the positioning block 14 is in pressing contact with the side of the positioning block strip 15 in the bent state.

In this embodiment, in order to prevent secondary puncture after emission and blood collection, a secondary puncture preventing bump 8 (see fig. 3 and 11) is disposed on a side portion of the needle core 2, the position of the secondary puncture preventing bump 8 on the cross section of the needle core 2 is arranged at 90 degrees with the locking bump 9, a secondary puncture preventing elastic sheet 7 (see fig. 2 and 11) is disposed on the tail cover 4 corresponding to the position of the secondary puncture preventing bump 8, and the secondary puncture preventing bump 8 slides on the surface of the secondary puncture preventing elastic sheet 7 during rebound of the needle core 2 so as to buffer kinetic energy of the needle core 2 (the working principle thereof will be described in detail later in the description of working process).

In this embodiment, in order to position the needle core 2 in the housing 1, particularly in the transverse circumferential direction, a rotation stopper 12 (see fig. 3 and 11) is provided on the side of the needle core 2, and a guide groove 20 is provided on the inner wall of the housing 1 corresponding to the rotation stopper 12, and the rotation stopper 12 is positioned in the guide groove 20 in the assembled state to prevent the rotation of the needle core 2 main body when the torsion handle 11 is twisted off. Of course, the rotation limiting block 12 and the guide groove 20 are matched to have a guide effect when the needle core 2 is launched, so that the needle tip keeps stable in other directions except the shooting direction when in puncture.

In order to better understand the relative positions and relationships between the components in the present invention, the following describes the blood sampling pen according to the present invention in connection with the usage state:

1. Initial assembled state

Fig. 11 and 12 are perspective and sectional views showing an initial state of an embodiment of the blood collector of the present invention, respectively. As can be seen from fig. 11 and 12, the locking spring 13 on the housing 1 has been pressed into a folded state turned inside out and formed as a locking projection. The tail cap 4 is fitted to the rear end of the housing 1 and is in a rear end position by the firing spring 3, at which time the locking catch 5 hooks onto the rear end face of the housing 1. The stop block 10 at the front end of the needle core 2 is propped against the inner wall at the front end of the ejection cavity of the shell 1, the front end of the launching spring 3 is propped against the rear part of the needle core 2, the rear end of the launching spring 3 is propped against the tail cover 4, and the launching spring 3 is in a pressed state. The rotation limiting block 12 on the torsion handle 11 of the needle core 2 is positioned in the guide groove 20 and prevents the needle core 2 from rotating.

2. State of falling needle core and twisting handle

Fig. 13 and 14 are perspective and sectional views showing a state in which a torsion handle of a lancet core is twisted off according to an embodiment of the present invention. As can be seen from fig. 13 and 14, after the torsion handle 11 on the needle core 2 is twisted off, the needle core 2 moves rightward under the influence of the firing spring 3 until the locking projections 9 on both sides of the needle core 2 are blocked by the locking projections formed by the two sides of the housing 1 being pressed by the locking spring pieces 13. The firing spring 3 is now in compression. The whole hemostix processes the state to be emitted.

3. Pressing the tail cap

Fig. 15 and 16 are front and cross-sectional views showing a state in which the tail cap is pressed by the blood collector according to the embodiment of the present invention. As can be seen from fig. 15 and 16. Pressing the tail cap 4 (shown by the arrow in fig. 16), the trigger inclined surfaces 6 on the upper and lower groups of unlocking parts 17 of the tail cap 4 are in contact with the locking protrusions (the pressed locking spring pieces 13) on both sides of the housing 1 (as shown by the circle in fig. 4), and the tail cap 4 is continuously pressed, so that the locking protrusions (the pressed locking spring pieces 13) on both sides of the housing 1 are forced to be opened and deformed outwards.

4. Emission state

Fig. 17 and 18 are perspective and cross-sectional views, respectively, showing an emitted state of the blood collector according to the embodiment of the present invention. As can be seen from fig. 17 and 18, when the locking protrusions on both sides of the housing 1 are completely pulled out by the trigger inclined surface 6, the locking protrusions 9 on both sides of the needle core 2 are unlocked, and the needle core 2 is pushed forward to be penetrated by the trigger spring 3.

5. Post-puncture state

Fig. 19 and 20 are perspective and cross-sectional views, respectively, showing a lancing state of an embodiment of the lancing device according to the present invention. As can be seen from fig. 19 and 20, after the puncture is completed, the needle core 2 moves backward under the action of the firing spring 3, and at this time, the secondary puncture preventing bump 8 on the needle core 2 contacts with the secondary puncture preventing elastic sheet 7 on the tail cover 4 and counteracts a part of the force of the firing spring 3 in a friction manner, so as to play a role in preventing the secondary puncture of the needle core.

6. State after use

FIG. 21 is a cross-sectional view of an embodiment of the lancing device according to the present invention in a post-use condition. As can be seen from fig. 21, after the tail cap 4 is pressed to the bottom, the triggering inclined surface 6 on the tail cap 4 presses the outer side of the locking spring piece 13 to abut against the inner wall of the tail cap 4, so that the tail cap 4 stays in the retracted position at the tail of the housing 1, and the blood collector is used until the needle point on the needle core 2 is hidden in the housing 1.

With respect to the above embodiments, the possible variations of the invention are described as follows:

1. in the above embodiment, the locking spring 13 is pressed and turned over inwardly by the process inclined surface 19 or the process curved surface on the assembly jig 16 on the automated assembly line before assembling the core 2 (see fig. 8 and 9). However, the present invention is not limited thereto, and the locking spring 13 may be turned inside out manually. As will be appreciated and accepted by those skilled in the art.

2. In the above embodiment, in order to enable the locking spring 13 on the housing 1 to be positioned after being pressed and turned inwards, the positioning block 14 (before being bent in fig. 4 and 5 and after being bent in fig. 6) and the positioning block bar 15 (see fig. 4 and 5) are also specially designed. However, the present invention is not limited thereto, and the locking spring 13 may be forced to bend and deform by pressing, for example, a micro groove is formed at the root of the locking spring 13. Other equivalent structures may be used instead, such as a protrusion and a slot, one of which is provided on the locking spring 13 and the other of which is provided on the casing 1 around the locking spring 13. As will be appreciated and accepted by those skilled in the art.

3. In the above embodiment, in order to make the positioning block 14 and the positioning block strip 15 have a certain distance before the locking spring 13 is bent, a bend is provided at the end of the locking spring 13 (see fig. 5 for clarity). The invention is not limited thereto and may be replaced by other similar structures without this design. As will be appreciated and accepted by those skilled in the art.

The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims

1. A tail push type hemostix locked by a technical elastic sheet comprises a shell (1), a needle core (2), a transmitting spring (3) and a tail cover (4);

An ejection cavity is formed in the shell (1), the needle core (2) is located in the ejection cavity, the tail cover (4) is arranged at the tail of the shell (1), and the tail cover (4) is connected with the needle core (2) through the emission spring (3);

the side part of the needle core (2) is provided with a locking lug (9) for locking, a locking spring piece (13) is arranged on the shell (1) corresponding to the locking lug (9), and an unlocking part (17) is arranged on the tail cover (4) corresponding to the locking spring piece (13);

The method is characterized in that: the locking spring piece (13) is a sheet-shaped body, the sheet-shaped body is an integral extending structure of the side part of the shell (1), the locking spring piece (13) has two flat and one bending states relative to the shell (1) shell around the locking spring piece, wherein:

The locking spring piece (13) is in a first flat state when the shell (1) is injection molded, and the locking spring piece (13) and the shell (1) around the shell are in a smooth state in the first flat state so as to avoid a mold drawing process channel (18) during injection molding;

before assembling the needle core (2), the locking elastic sheet (13) is extruded and turns inwards, the state is changed from a first flat state to a bending state, the locking elastic sheet (13) occupies the position of a drawing process channel (18) in the bending state and forms a locking bulge at the side part of the ejection cavity, and the locking bulge is matched with a locking lug (9) at the side surface of the needle core (2) under the action of the emission spring (3) to enable the needle core (2) to be in a locking state to be emitted;

When the tail cover (4) is pressed, the unlocking part (17) moves forwards along with the tail cover (4), the acting end of the unlocking part (17) extrudes the locking elastic piece (13) and forces the locking elastic piece (13) to outwards turn over, the locking elastic piece is converted into a second flat state from a bending state, the locking elastic piece (13) is separated from the locking convex block (9) in the second flat state, and the needle core (2) is launched under the action of the launching spring (3).

2. The tail push hemostix of claim 1, wherein: the action end of the unlocking part (17) is provided with a triggering inclined surface (6) facing to the outer side, and after the tail cover (4) is pressed, the triggering inclined surface (6) presses the locking spring piece (13) to abut against the inner wall of the tail cover (4) after the needle core (2) is launched, so that the tail cover (4) stays at the retracted position of the tail part of the shell (1).

3. The tail push hemostix of claim 1, wherein: before the needle core (2) is assembled, the locking spring piece (13) is extruded by a process inclined surface (19) or a process curved surface and turns inwards, and the process inclined surface (19) or the process curved surface faces inwards.

4. The tail push hemostix of claim 1, wherein: the side of the locking spring piece (13) is provided with a positioning clamping block (14), a positioning clamping strip (15) is arranged for the positioning clamping block (14), the positioning clamping strip (15) is parallel to the locking spring piece (13) at a distance, and the positioning clamping block (14) is in pressing contact with the side surface of the positioning clamping strip (15) when the locking spring piece (13) is in a bending state, so that the locking spring piece (13) is kept in the bending state.

5. The tail push hemostix of claim 4 wherein: the end of the locking spring piece (13) is provided with a bending section, the positioning clamping block (14) is arranged on the side part of the bending section, the positioning clamping block (14) is separated from the side surface of the positioning clamping strip (15) in the first flat state and the second flat state of the locking spring piece (13), and the positioning clamping block (14) is in abutting contact with the side surface of the positioning clamping strip (15) in the bending state.

6. The tail push hemostix of claim 1, wherein: the lateral part of nook closing member (2) is equipped with prevents secondary puncture lug (8), and the position of this secondary puncture lug (8) on nook closing member (2) cross section is 90 degrees with locking lug (9) and arranges, is equipped with on tail-hood (4) corresponding to the position of preventing secondary puncture lug (8) and prevents secondary puncture shell fragment (7), prevents secondary puncture lug (8) at the surface sliding friction of preventing secondary puncture shell fragment (7) at nook closing member (2) rebound in-process to this buffering nook closing member (2) kinetic energy.

7. The tail push hemostix of claim 1, wherein: the side part of the needle core (2) is provided with a rotary limiting block (12), the inner wall of the shell (1) corresponding to the rotary limiting block (12) is provided with a guide groove (20), and the rotary limiting block (12) is positioned in the guide groove (20) in the assembled state.