CN115040125A - Tail pressing type hemostix locked by process spring plate - Google Patents

Abstract

The utility model provides an adopt afterbody push type hemostix of technology shell fragment locking, includes shell, nook closing member, transmission spring and tail-hood, its characterized in that: the side part of the shell is provided with a locking spring sheet aiming at the locking lug on the stylet, the locking spring sheet has two flat and one bent states relative to the shell around the locking spring sheet, wherein: when the shell is subjected to injection molding, the locking elastic sheet is in a first flat state so as to avoid a mold drawing process channel during injection molding; before assembling the stylet, the locking spring plate is extruded and turned inwards, and is changed from a first flat state to a bent state to form a locking bulge; when the tail cover is pressed, the unlocking part on the tail cover extrudes the locking elastic sheet and forces the locking elastic sheet to turn outwards, and the locking elastic sheet is changed into a second flat state from a bending state, so that the needle core is released for producing puncture shooting. The scheme greatly reduces the difficulty of designing and manufacturing the die, simplifies the die structure and improves the product quality and reliability.

Description

Tail pressing type hemostix locked by process spring plate

Technical Field

The invention relates to the field of medical blood sampling instruments, in particular to a tail pressing type disposable blood sampler locked by a process spring plate. The hemostix is characterized in that the needle core is locked by the process elastic sheet formed by simple process processing after injection molding, thereby greatly reducing the difficulty of the mold and improving the quality and reliability of the product.

Background

Among medical blood collection devices, disposable 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.

Chinese patent CN108186029A discloses an invention patent application with patent application number 201810157218.6, entitled "tail pressing type disposable safety blood collector". This application as prior art in the present case gives the following information: firstly, a representative basic structure of the tail pressing type hemostix is shown in the structure, namely a classic structure consisting of a shell, a stylet, a launching spring and a tail cover; secondly, in order to solve the problem that the hemostix can not be used again, the following technical measures are adopted: 1. the tail cover is provided with an active locking part for locking, and a passive locking part is arranged on the elastic arm corresponding to the shell; 2. the positions and the matching time of the active locking part and the passive locking part are related 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 time is met only if the active unlocking part and the passive unlocking part are matched firstly in time. When the puncture needle is used, the tail cover is pressed, the stylet is forced to be unlocked firstly, the puncture is launched, and then the tail cover and the elastic arm on the shell enter a lock hook state and cannot be used again.

Theoretically, the novel point of the patent application is outstanding, the structural characteristics are distinct, the safety is high, the user experience is good, the tail cover is permanently locked on the elastic arm of the shell after being used, the safety of disposable use is guaranteed, and the tail cover can be visually identified to be in an obvious retracted state at the tail of the shell after being used in appearance. However, the technical solution of the patent has the biggest defects from the manufacturing process perspective: firstly, the injection mold has a complex structure, great design and manufacturing difficulty and high cost; secondly, because shell and tail-hood structure are meticulous and the required precision is high, the injection moulding product quality is unstable, and the reliability is low in the use.

Therefore, how to improve the existing design can reduce the difficulty of mold design and manufacture and meet the requirements of stable and reliable product quality is the problem to be solved by the invention.

Disclosure of Invention

The invention provides a tail pressing type hemostix locked by a process spring plate, and aims to solve the problems of complex structure, high design and manufacturing difficulty, unstable quality of injection products and low reliability in use of the existing tail pressing type hemostix.

In order to achieve the purpose, the invention adopts the technical scheme that: a tail pressing type hemostix locked by a craft elastic sheet comprises a shell, a stylet, a launching spring and a tail cover.

The ejection cavity is arranged in the shell, the needle core is located in the ejection cavity, the tail cover is installed at the tail of the shell, and the tail cover is connected with the needle core through the ejection spring.

The side of the needle core is provided with a locking convex block for locking, a locking elastic sheet is arranged on the shell corresponding to the locking convex block, and an unlocking part is arranged on the tail cover corresponding to the locking elastic sheet.

The innovation lies in that: the locking spring plate is a plate-shaped body which is an integral extension structure of the side part of the shell, and the locking spring plate has two flat and one bent states relative to the shell body around the locking spring plate, wherein:

the locking spring plate is in a first flat state during the injection molding of the shell, and the locking spring plate and the shell body around the locking spring plate are in a smooth state in the first flat state so as to avoid a die drawing process channel during the injection molding.

Before the needle core is assembled, the locking elastic sheet is extruded and turned inwards, the needle core is changed into a bent state from a first flat state, the locking elastic sheet occupies the position of a die drawing process channel in the bent state and forms a locking bulge at the side part of the ejection cavity, and the locking bulge is matched with a locking lug on the side surface of the needle core under the action of the ejection spring to enable the needle core to be in a locking state to be ejected.

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 sheet and forces the locking elastic sheet to turn outwards, the bending state is changed into a second flat state, the locking elastic sheet is separated from the locking lug in the second flat state, and the needle core is launched under the action of the launching spring.

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

1. in the above scheme, the shell, the stylet, the launch spring and the tail cap are basic structures of the tail pressing type disposable blood collector, and the basic functions and functions of the tail pressing type disposable blood collector are the prior art.

2. In the above embodiment, the "front" in the "forward" refers to the direction of the needle tip in the blood collection device.

3. In the above scheme, the "flat state" refers to that the locking spring plate is used as a part of the housing structure, the locking spring plate and other surrounding housings keep a smooth state which is favorable for injection molding and demolding from the aspects of mold design and injection molding process, and the "bent state" refers to a bent state obtained after the locking spring plate is extruded and deformed on the basis of the "flat state". The "drawing process channel" refers to a path or channel required for demolding a part in an injection molding process, which is a problem to be considered by a person skilled in the art in designing an injection molding type part product.

4. In the above-described aspect, the term "turn-inside" refers to turning in a direction toward the center axis of the blood collection device with reference to the body to be turned itself, and the term "turn-outside" refers to turning in a direction away from the center axis of the blood collection device with reference to the body to be turned itself.

5. In the above scheme, the head of the shell 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 invention.

6. The tail pressing type hemostix of the invention comprises a twist cap type structure and a cap type structure. Namely, the disposable hemostix of the present 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 invention.

6. In the above scheme, the action end of the unlocking part is provided with a trigger inclined plane facing outwards, and the tail cover is pressed to press the trigger inclined plane to press the locking elastic sheet to abut against the inner wall of the tail cover after the stylet is launched, so that the tail cover stays at the retraction position of the tail part of the shell.

7. In the above scheme, before the stylet is assembled, the locking spring plate is extruded by the process inclined plane or the process curved surface and turned inwards, and the process inclined plane or the process curved surface faces inwards.

8. In the above scheme, a positioning clamping block is arranged beside the locking elastic sheet, a positioning clamping strip is arranged aiming at the positioning clamping block, the positioning clamping strip and the locking elastic sheet are arranged at a distance in parallel, and the positioning clamping block is in abutting contact with the side surface of the positioning clamping strip under the condition that the locking elastic sheet is in a bending state, so that the locking elastic sheet is kept in the bending state. Further, the method comprises the following steps: the end of the locking elastic sheet is provided with a bending section, the positioning fixture block is arranged on the side part of the bending section, the distance between the positioning fixture block and the side surface of the positioning fixture strip is kept when the locking elastic sheet is in a first flat state and a second flat state, and the positioning fixture block is in abutting contact with the side surface of the positioning fixture strip in the bending state.

9. In the above scheme, the lateral part of the stylet is provided with the secondary puncture prevention convex block, the position of the secondary puncture prevention convex block on the cross section of the stylet is 90 degrees to the locking convex block, the secondary puncture prevention elastic sheet is arranged on the tail cover corresponding to the position of the secondary puncture prevention convex block, and the secondary puncture prevention convex block slides and rubs on the surface of the secondary puncture prevention elastic sheet in the rebound process of the stylet so as to buffer the kinetic energy of the stylet.

10. In the above scheme, the lateral part of the stylet is provided with the rotary limiting block, the inner wall corresponding to the shell of the rotary limiting block is provided with the guide groove, and the rotary limiting block is positioned in the guide groove in an assembly state.

The design principle, the technical conception and the effect of the invention are as follows: in order to solve the problems of complex structure, high design and manufacturing difficulty, unstable quality of injection products and low reliability in use of the existing injection mold of the tail pressing type hemostix, the invention is favorable for simplifying the structure of the mold, reducing the design and manufacturing difficulty of the mold, improving the injection quality of the products and ensuring the use reliability, and the following improvements are carried out on the original design:

firstly, the long and large elastic arm (see the arm length of the elastic arm in the comparison document) on the original blood collector shell is improved into a relatively small craft elastic piece structure. Although the technical elastic sheet cannot be directly used, the technical elastic sheet is short and small compared with the traditional elastic arm, and the technical elastic sheet and the shell body around the technical elastic sheet are in a smooth state when the shell is subjected to injection molding, so that the design and manufacturing difficulty of a mold can be greatly reduced, and the structure of the mold is simplified. And if the elastic arm in the comparison document needs to be made small and short, the elastic distance cannot be ensured because the elastic arm is directly used. Therefore, it is theoretically infeasible to make the elastic arm small according to the design idea in the comparison document.

Secondly, the process spring plate formed by direct injection molding can not be directly used, and the process spring plate needs to be specially extruded and bent before the needle core is assembled, so that the needle core is turned inwards to form a bent state. Although the process spring plate occupies the position of the drawing process channel in the bent state and forms the locking protrusion at the side part of the ejection cavity, the demolding is already finished at the moment, so that the demolding is not influenced.

Thirdly, although the process spring plate can be used only by extrusion deformation after injection molding, the process spring plate has the positive effects of reducing the difficulty in designing and manufacturing the die, simplifying the structure of the die and improving the quality and reliability of products, which are difficult to predict in advance. In contrast, the addition of an extrusion bending process is readily available, particularly on automated assembly lines.

Fourth, it is not difficult to provide a locking projection on an object from the viewpoint of structural design and injection molding process, and it is difficult to provide such a locking projection (hook on elastic arm in reference) on the inner wall of the cylindrical member and also on the elastic arm. Firstly, the locking protrusion occupies the die drawing process channel of the cylindrical member, which brings difficulty to the demolding after injection molding, and the mold is set to be necessarily complex in order to solve the demolding problem. Even such a locking projection cannot be designed to be large, and a small locking projection reduces the reliability of locking, so that it is difficult to ensure the quality of an injection-molded product. The other is to ensure the reliability of the locking protrusion in the locked and unlocked states, which is to make the locking protrusion have enough displacement between the locked and unlocked states, and the only way to ensure such displacement is to design the longer elastic arm, and the longer elastic arm must make the elastic arm wider and thicker to ensure the elasticity and strength. This is why the spring arm is large and long in the prior art (in this case in comparison). The invention can change the original long and big elastic arm and the smaller hook (see the elastic arm and the hook arranged on the elastic arm in the comparison file) into a smaller process spring plate structure by adding an extrusion bending treatment, thus greatly improving the complexity of the mould, the design and manufacture difficulty and the injection molding process, greatly improving the reliability of the locking bulge and ensuring the product quality. As can be seen, the effect brought about by the present invention is remarkable and such effect is of non-obvious ease and material nature to those skilled in the art.

Fifthly, in the launching process, for the technical elastic sheet which is turned inwards to be in a bent state, the unlocking part on the tail cover is used for reversely extruding the technical elastic sheet, so that the technical elastic sheet is turned outwards to be restored to the original flat state, and the needle core can be released under the action of the launching spring to generate shooting puncture. It can be seen that this is also relatively easy to achieve.

In conclusion, the invention has the advantages of ingenious technical concept, reasonable design and obvious and unpredictable effect in advance, thereby having prominent substantive characteristics and remarkable progress compared with the prior art.

Drawings

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

FIG. 2 is a perspective view of a tail cap of the blood collection device according to the present invention;

FIG. 3 is a perspective view of a needle core of an embodiment of the blood collection device of the present invention;

FIG. 4 is a perspective view of the housing of the hemostix of the present invention before the first view locking spring is deformed by squeezing;

FIG. 5 is a perspective view of the housing of the hemostix according to the present invention before the second view angle locking spring is deformed by squeezing;

FIG. 6 is a perspective view of the housing of the hemostix according to the embodiment of the present invention after the second view locking elastic piece is deformed by squeezing;

FIG. 7 is a front view of the housing of the blood collection device of the present invention before the locking spring is deformed by squeezing;

FIG. 8 is a schematic view of the housing of the blood collection device of the present invention before squeezing the locking spring;

FIG. 9 is a schematic view of an embodiment of the blood collection device of the present invention after squeezing a locking spring plate in an outer case;

FIG. 10 is a front view of the blood collection device of the present invention after the locking spring plate is deformed by squeezing;

FIG. 11 is a perspective view of an initial state of the blood collection set according to the present invention;

FIG. 12 is a sectional view of an initial state of the blood collection device of the present invention;

FIG. 13 is a perspective view showing a state where a handle is twisted off a core in the embodiment of the blood collection device of the present invention;

FIG. 14 is a sectional view of the blood collection device of the present invention with the hub twisted off;

FIG. 15 is a front view of a hemostix according to an embodiment of the present invention with the tail cap pressed;

FIG. 16 is a cross-sectional view of a hemostix according to an embodiment of the present invention with the tail cap pressed;

FIG. 17 is a perspective view of an embodiment of the blood collection device of the present invention in an emitting state;

FIG. 18 is a cross-sectional view of an embodiment of the blood collection set of the present invention in an emission state;

FIG. 19 is a perspective view of the blood collection set of the present invention after puncturing;

FIG. 20 is a sectional view of the blood collection set of the present invention after puncturing;

FIG. 21 is a sectional view showing a state after the blood collecting device of the present invention is used.

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 the inclined plane; 7. secondary puncture preventing elastic sheets; 8. the secondary puncture prevention bump; 9. a locking projection; 10, a stop block; 11. twisting a handle; 12. rotating the limiting block; 13. locking the elastic sheet; 14. positioning a fixture block; 15. positioning the clamping strip; 16. assembling a jig; 17. an unlocking portion; 18. a die drawing process channel; 19. a process bevel; 20. a guide groove.

Detailed Description

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

example (b): tail pressing type hemostix locked by process spring plate

Since the structure, structure and components of the tail-pressing type blood sampling device of the present invention have symmetry with respect to the central axis of the blood sampling device, only one half of the symmetry will be described in the following description, and those skilled in the art can understand the structure and operation principle of the other half by the symmetry principle according to the illustration of the present invention.

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

The ejection cavity is arranged in the shell 1, the front end of the ejection cavity is provided with a needle outlet hole (shown in figures 11 and 12), the needle core 2 is positioned in the ejection cavity (shown in figure 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 launching spring 3 (shown in figure 12).

The needle core 2 and the twist handle 11 are integrally formed (see fig. 3), thereby forming a twist handle type tail pressing type disposable blood collector. The twist handle 11 is positioned at the front part of the stylet 2 and is connected with the stylet 2 into an integrated injection molding structure, the twist handle 11 is formed by fixedly connecting a twisting part and a protective rod, and a contraction neck (not marked in the figure) which can be twisted off is arranged between the protective rod and the stylet 2. The side of the stylet 2 is provided with a locking lug 9 (see fig. 3) for locking, a locking spring piece 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 piece 13. The active end of the unlocking portion 17 is provided with an outwardly directed trigger ramp 6 (see fig. 2 and 12). The four unlocking portions 17 and the trigger slopes 6 can be used not only for unlocking but also for stopping the tail cap 4 in a retracted position at the rear of the housing 1 after firing (the working principle will be described in detail later in the description of working procedures). A stopper 10 (see fig. 3) is provided between the torsion portion of the torsion bar 11 and the guard bar, and the stopper 10 is used to prevent erroneous firing in an initial assembly state (the working principle of the operation will be described in detail later).

The tail cap 4 (see fig. 2) is mounted at the tail of the housing 1 (see fig. 11 and 12) in an assembled state, the tail cap 4 is connected with the housing 1 in a sliding manner in the axial direction of the blood sampler, and the tail cap 4 is provided with a limit position relative to the rear end of the housing 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) at the top and bottom. In a state of waiting for launching, the rear end of the spring 3 is pressed against the tail cover 4, and the locking buckle 5 is hooked on the rear end surface of the shell 1 to force the tail cover 4 to be at a rear end limiting position in a sliding direction relative to the shell 1.

The locking elastic sheet 13 is a sheet-shaped body (see fig. 7), the sheet-shaped body is an integral extension structure of the side part of the shell 1, the locking elastic sheet 13 has two flat and one bending states relative to the shell body of the shell 1 around the locking elastic sheet 13, wherein:

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

The locking spring 13 is pressed and turned inside before the core 2 is assembled, and is changed from the first flat state to the 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 inwardly, and finally the locking spring 13 is in a state of bending inwardly (see fig. 10). In this embodiment, the locking spring 13 is pressed and turned inside before the assembly of the core 2 by a technical bevel 19 or technical curve, which technical bevel 19 or technical curve is turned inside. The technical inclined plane 19 or the technical curved surface is arranged on an assembling jig 16, and the assembling jig 16 is a tool clamp on an automatic assembling 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 the locking protrusion is matched with the locking lug 9 at the side of the stylet 2 under the action of the firing spring 3 to enable the stylet 2 to be in a locking state to be fired (see fig. 11 and 12).

When the tail cap 4 is pressed, the unlocking part 17 moves forwards along with the tail cap 4, the action end of the unlocking part 17 presses the locking elastic sheet 13 and forces the locking elastic sheet 13 to turn outwards, the bending state is changed into a second flat state (see fig. 15 and 16), the locking elastic sheet 13 is separated from the locking lug 9 in the second flat state, and the needle core 2 is shot under the action of the shooting spring 3 (see fig. 17 and 18).

In the previous description of the embodiment of the present invention, the locking spring 13 is also referred to as a craft spring, which theoretically corresponds to the function and effect of the elastic arm and the hook in the prior art (the reference in the background). Although the locking elastic sheet 13 (craft elastic sheet) is also arranged on the shell 1, the locking elastic sheet 13 can not be directly used when being injection molded, and a locking bulge is not formed, at the moment, the locking elastic sheet 13 is in a first flat state, the function is only equivalent to the function of an elastic arm in the prior art (comparison document), but the locking elastic sheet does not have the locking function of a hook (because the locking bulge is not formed at the moment). The function of the elastic arm and the hook in the prior art (comparison document) is equivalent to that generated by the elastic arm and the hook in the prior art when the locking elastic sheet 13 (craft elastic sheet) is extruded and turned inwards and then deformed into the locking protrusion. Therefore, the locking elastic sheet 13 of the present invention is only an elastic sheet brought by an injection molding process at the time of initial injection molding, and actually has the elastic protrusion with the locking and unlocking functions only by being pressed and turned inward at the later stage. This is a substantial difference between the present invention and the prior art.

In this embodiment, in order to position the locking elastic sheet 13 on the housing 1 after being pressed and turned inward without rebounding, the following structure is further designed: a positioning fixture block 14 is arranged beside the locking elastic sheet 13 (before bending in fig. 4 and 5, and after bending in fig. 6), a positioning fixture strip 15 is arranged for the positioning fixture block 14, the positioning fixture strip 15 is parallel to the locking elastic sheet 13 at a distance (see fig. 4-5), and the positioning fixture block 14 is in pressing contact with the side surface of the positioning fixture strip 15 when the locking elastic sheet 13 is in a bending state (see fig. 6), that is, the positioning fixture block 14 and the side surface of the positioning fixture strip 15 interfere with each other, so that the locking elastic sheet 13 is kept in the bending state.

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

In the embodiment, in order to prevent the secondary puncture after the blood sampling, a secondary puncture preventing projection 8 is arranged on the side of the needle core 2 (see fig. 3 and 11), the orientation of the secondary puncture preventing projection 8 on the cross section of the needle core 2 is 90 degrees with the locking projection 9, a secondary puncture preventing spring 7 is arranged on the tail cover 4 corresponding to the position of the secondary puncture preventing projection 8 (see fig. 2 and 11), and the secondary puncture preventing projection 8 slides and rubs on the surface of the secondary puncture preventing spring 7 in the rebound process of the needle core 2, so that the kinetic energy of the needle core 2 is buffered (the working principle of the secondary puncture preventing projection is explained in detail in the working process).

In the present 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 at a side portion of the needle core 2, 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 located in the guide groove 20 in the assembled state, preventing the rotation of the needle core 2 main body when the twist grip 11 is twisted off. Of course, the rotation limiting block 12 and the guide groove 20 are matched to have a guiding function when the needle core 2 is launched, so that the needle point can be kept stable in other directions except the shooting direction during puncture.

In order to better understand the relative positions and relationships among the components of the invention, the blood sampling pen of the invention is described in combination with the use state as follows:

1. initial assembled state

Fig. 11 and 12 are a perspective view and a sectional view of an initial state of the blood collection device according to the embodiment of the present invention. 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 and formed as a locking projection. The tail cap 4 is fitted to the rear of the housing 1 and is in a rear end position under the action of the firing spring 3, with the locking catch 5 hooked on the rear end face of the housing 1. The stop block 10 at the front end of the needle core 2 is pressed 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 pressed against the rear part of the needle core 2, the rear end of the launching spring 3 is pressed against the tail cover 4, and the launching spring 3 is in a pressed state. The rotation stopper 12 on the twist handle 11 of the stylet 2 is positioned in the guide groove 20 and prevents the stylet 2 from rotating.

2. Handle-twisted state of dropped needle core

FIG. 13 and FIG. 14 are a perspective view and a sectional view showing a state where a hub is twisted off in the blood collecting device according to the embodiment of the present invention. As can be seen from figures 13 and 14, after the twist handle 11 on the stylet 2 is twisted off, the stylet 2 is influenced by the firing spring 3 to move rightwards until the locking projections 9 on both sides of the stylet 2 are blocked by the locking projections formed after both sides of the housing 1 are pressed by the locking spring 13. The firing spring 3 is now in compression. The whole blood collector processes the state to be emitted.

3. State of tail cover pressing

Fig. 15 and 16 are a front view and a cross-sectional view showing a state where the tail cap is pressed in the blood collecting device according to the embodiment of the present invention. As can be seen in fig. 15 and 16. When the tail cover 4 is pressed (as shown by an arrow in fig. 16), the trigger slopes 6 on the two sets of unlocking portions 17 on the tail cover 4 are in contact with the locking protrusions (the pressed locking elastic pieces 13) on the two sides of the housing 1 (as shown by a circle in fig. 4), and the tail cover 4 is continuously pressed to make the locking protrusions (the pressed locking elastic pieces 13) on the two sides of the housing 1 open and deform outwards.

4. Transmitting state

Fig. 17 and 18 are a perspective view and a sectional view showing an emission state of the blood collection device according to the embodiment of the present invention. As can be seen from figures 17 and 18, when the locking projections on both sides of the housing 1 are fully disengaged by the trigger ramp 6, the locking projections 9 on both sides of the stylet 2 are unlocked and the stylet 2 is fired forward under the urging of the firing spring 3.

5. Post-puncture state

FIG. 19 and FIG. 20 are a perspective view and a sectional view, respectively, showing a state after puncturing in an embodiment of the blood collecting device of the present invention. As can be seen from fig. 19 and 20, after the puncture is completed, the stylet 2 moves backwards under the action of the firing spring 3, and at this time, the secondary puncture preventing projection 8 on the stylet 2 contacts with the secondary puncture preventing elastic sheet 7 on the tail cap 4 and offsets a part of the force of the firing spring 3 in a friction manner, thereby playing a role of preventing the stylet from secondary puncture.

6. After use state

FIG. 21 is a sectional view showing a state after the blood collecting device of the embodiment of the present invention is used. As can be seen from fig. 21, after the tail cap 4 is pressed to the bottom, the trigger inclined plane 6 on the tail cap 4 presses the outer side of the locking elastic sheet 13 to abut against the inner wall of the tail cap 4, so that the tail cap 4 is stopped at the retracted position at the tail of the housing 1, and the use of the blood sampling device is completed, and the needle point on the needle core 2 is hidden in the housing 1.

With respect to the above embodiments, possible variations of the present invention are described below:

1. in the above embodiment, before the assembling of the stylet 2, the locking spring 13 is pressed by the technical inclined surface 19 or the technical curved surface on the assembling jig 16 on the automatic assembling line and turned inside (see fig. 8 and 9). However, the present invention is not limited to this, and the locking spring 13 may be turned inside manually. As would be understood and accepted by those skilled in the art.

2. In the above embodiment, in order to position the locking elastic piece 13 on the housing 1 after being pressed and turned inside, a positioning latch 14 (before bending in fig. 4 and 5, and after bending in fig. 6) and a positioning latch strip 15 (see fig. 4 and 5) are specially designed. However, the present invention is not limited to this, and the locking elastic sheet 13 may be forced to bend and deform completely by pressing without adopting such a design, for example, a micro groove is provided at the root of the locking elastic sheet 13. Other equivalent structures can be adopted instead, such as a protrusion and a slot, one of the protrusion and the slot is arranged on the locking elastic sheet 13, and the other is arranged on the shell of the shell 1 around the locking elastic sheet 13. As would be understood and accepted by those skilled in the art.

3. In the above embodiment, in order to make the positioning fixture block 14 and the positioning fixture strip 15 have a certain distance before the locking elastic sheet 13 is bent, a bend is provided at the end of the locking elastic sheet 13 (see fig. 5 for clarity). However, the present invention is not limited thereto, and other similar structures may be substituted therefor. As would be understood and accepted by those skilled in the art.

The above embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention by this means. 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 (7)

1. A tail pressing type hemostix locked by a craft elastic sheet comprises a shell (1), a stylet (2), a launching spring (3) and a tail cover (4);

an ejection cavity is arranged in the shell (1), the needle core (2) is positioned in the ejection cavity, the tail cover (4) is installed at the tail of the shell (1), and the tail cover (4) is connected with the needle core (2) through the ejection spring (3);

a locking lug (9) for locking is arranged at the side part of the needle core (2), a locking elastic sheet (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 elastic sheet (13);

the method is characterized in that: the locking elastic sheet (13) is a sheet-shaped body which is an integral extension structure of the side part of the shell (1), the locking elastic sheet (13) has a twice flat and once bent state relative to the shell body of the shell (1) around the locking elastic sheet (13), wherein:

when the shell (1) is subjected to injection molding, the locking elastic sheet (13) is in a first flat state, and the locking elastic sheet (13) and the shell body of the shell (1) around the locking elastic sheet and the shell body are in a smooth state under the first flat state so as to avoid a die drawing process channel (18) during injection molding;

before the needle core (2) is assembled, the locking elastic sheet (13) is extruded and turned inwards, the needle core is changed from a first flat state to a bent state, the locking elastic sheet (13) occupies the position of a die drawing process channel (18) in the bent state and forms a locking bulge at the side part of an ejection cavity, and the locking bulge is matched with a locking lug (9) on the side surface of the needle core (2) under the action of a launching spring (3) to enable the needle core (2) to be in a locking state to be launched;

when the tail cover (4) is pressed, the unlocking part (17) moves forwards along with the tail cover (4), the action end of the unlocking part (17) presses the locking elastic sheet (13) and forces the locking elastic sheet (13) to turn outwards, the bending state is changed into a second flat state, the locking elastic sheet (13) is separated from the locking bump (9) in the second flat state, and the needle core (2) launches under the action of the launching spring (3).

2. The push-type hemostix according to claim 1, wherein: the action end of the unlocking part (17) is provided with a trigger inclined plane (6) facing outwards, and the tail cover (4) is pressed to press the trigger inclined plane (6) to press the locking elastic sheet (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 retraction position of the tail part of the shell (1).

3. The push-type hemostix according to claim 1, wherein: before the needle core (2) is assembled, the locking elastic sheet (13) is extruded by a process inclined plane (19) or a process curved surface and turned inwards, and the process inclined plane (19) or the process curved surface faces inwards.

4. The push-type hemostix according to claim 1, wherein: the side of the locking elastic sheet (13) is provided with a positioning clamping block (14), a positioning clamping strip (15) is arranged aiming at the positioning clamping block (14), the positioning clamping strip (15) is parallel to the locking elastic sheet (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 elastic sheet (13) is in a bending state, so that the locking elastic sheet (13) is kept in the bending state.

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

6. The push-type hemostix according to claim 1, wherein: the lateral part of nook closing member (2) is equipped with prevents secondary puncture lug (8), should prevent that secondary puncture lug (8) position 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) and preventing secondary puncture shell fragment (7) surface sliding friction at nook closing member (2) resilience in-process to this buffering nook closing member (2) kinetic energy.

7. The push-type hemostix according to 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 an assembly state.

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