CN109512437B

CN109512437B - Needle type blood sampling pen without cap dismounting

Info

Publication number: CN109512437B
Application number: CN201811548142.6A
Authority: CN
Inventors: 施国平; 安东尼·斯科特·霍斯特曼
Original assignee: Sterilance Medical Suzhou Inc
Current assignee: Sterilance Medical Suzhou Inc
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2021-05-07
Anticipated expiration: 2038-12-18
Also published as: CN109512437A

Abstract

The utility model provides a exempt from to unload cap loading and unloading needle type blood sampling pen, includes penetrates the pole, unloads needle pole and casing, its characterized in that: the shooting rod is formed by connecting a front shooting rod, a connecting spring and a rear shooting rod; the needle outlet hole at the front end of the blood taking pen is designed into a loading and unloading hole through which the blood taking needle can pass; the rear shooting rod is provided with a rear rod front limiting structure, so that the rear shooting rod has a limiting distance in the forward movement; the front shooting rod is provided with a front rod front limiting structure, so that the front shooting rod has a limiting distance in the forward movement; in the needle unloading state, the limit distance of the front shooting rod is designed to be larger than that of the rear shooting rod. The invention is characterized in that the cap of the pen is not needed to be removed when the blood taking needle is assembled and disassembled, compared with the original blood taking pen, the needle assembling process is reduced from the original four steps to one step, and the needle disassembling process is reduced from the original three steps to one step. The technical scheme thoroughly solves the problem that the original blood sampling pen needs to be repeatedly disassembled and assembled in use, greatly simplifies the operation steps and brings great convenience to use.

Description

Needle type blood sampling pen without cap dismounting

Technical Field

The invention relates to a medical blood sampling apparatus, in particular to a cap-removal-free needle-assembling and disassembling type blood sampling pen matched with a disposable blood sampling needle. The blood taking pen does not need to remove the pen cap in use, and the disposable blood taking needle can be directly assembled and disassembled from the front end of the pen head, so that great convenience is brought to use.

Background

The blood taking pen is a blood taking device matched with a disposable blood taking needle for use, wherein the blood taking pen can be repeatedly used, and the blood taking needle is only used once to avoid cross infection. The development of blood sampling pens has been in history for decades, and the improvement of blood sampling pens is continuously developed, so that how to make blood sampling pens become convenient to use in the technical field of blood sampling pens is one of the hot spots which are always concerned by the technicians in the field.

Chinese patent CN201510290U issued on 23.06.2010 in the name of "an automatic withdrawing needle type blood sampling pen" a utility model patent with application number 200920313374.3. The pen mainly comprises a pen cap, a pen holder, a launching mechanism and the like, wherein the pen cap is assembled on the pen holder, and the blood taking needle launching mechanism is arranged in the pen holder. In the field of blood collection pens, a removable pen cap is specially designed so as to mount and dismount a disposable blood collection needle, which is a typical structure of the blood collection pens. Generally, the using and operating steps of the blood sampling pen are as follows: firstly, disassembling a pen cap; secondly, inserting a disposable blood taking needle into a needle seat at the front end of the penholder; thirdly, the pen cap is arranged on the pen holder; fourthly, loading the blood taking needle into the chamber; fifthly, aiming at the blood sampling part, pressing a button to launch a blood sampling needle for puncture blood sampling; sixthly, disassembling the pen cap again; seventhly, the disposable blood taking needle is removed; and eighthly, the cap is assembled on the penholder. The operation of the blood sampling pen has the following two characteristics: firstly, the operation steps are multiple, the actions are multiple, and the operation is complicated; secondly, the cap needs to be repeatedly disassembled and assembled during use. The reason is mainly that the structural design of the blood sampling pen adopts a detachable pen cap structure. The detachable pen cap structure is just convenient for replacing the disposable blood taking needle, and reflects the requirement that the blood taking pen can be repeatedly used and the blood taking needle can be used for one time. Therefore, a blood sampling pen product with a detachable pen cap structure in the field of blood sampling pens has almost monopoly for a long time.

With the development of the blood sampling pen technology, technicians have recognized that the blood sampling pen with the existing detachable pen cap structure has multiple operation steps in use, which brings inconvenience to use. But the structural design of the blood sampling pen is difficult to break through for a long time. Therefore, it is a technical problem in the art to design a blood sampling pen which can avoid repeatedly assembling and disassembling a pen cap without influencing the assembling and disassembling of a blood sampling needle.

Disclosure of Invention

The invention provides a needle-assembling and disassembling blood sampling pen without disassembling a cap, and aims to solve the problems of multiple operation steps and inconvenience in use of the conventional blood sampling pen with a detachable pen cap structure.

In order to achieve the purpose, the invention adopts the technical scheme that: a cap-removal-free needle-assembling and disassembling blood sampling pen comprises a shooting rod, a needle-disassembling rod and a shell.

The shooting rod is an emission part of the blood sampling pen, and the head of the shooting rod is provided with a needle seat for inserting a disposable blood sampling needle.

The needle unloading rod is a needle unloading part of the blood sampling pen, a needle unloading action surface is arranged on the needle unloading rod and used for pushing and unloading the blood sampling needle arranged on the needle seat.

The casing is formed by connecting a pen head and a pen body or integrally connecting the pen head and the pen body, an ejection cavity is formed in the pen head and the pen body, the ejection rod is arranged in the ejection cavity, and a locking structure for loading and locking the ejection rod is arranged between the ejection rod and the casing; the needle discharging rod is arranged on the shell in a sliding mode, wherein the needle discharging action surface is located at the rear portion of the needle seat and is located on the sliding path of the shooting rod.

The innovation lies in that: penetrate the pole by penetrate the pole before, penetrate pole and coupling spring and constitute after, penetrate the pole before with penetrate the pole penetrate pole sliding fit on penetrating the pole axis direction, coupling spring connects penetrate before and penetrate after and penetrate between the pole and act on penetrate the axis direction of pole.

The needle file is arranged at the head of the forward-shooting rod, a loading and unloading hole through which the blood taking needle can pass is formed in the front end of the pen point corresponding to the needle file, and the loading and unloading hole is opposite to the needle file at the head of the forward-shooting rod.

The rear ejection rod is provided with a rear rod limiting surface, a rear rod blocking surface is arranged on the pen body corresponding to the rear rod limiting surface, and in the forward movement process of the rear ejection rod, the rear rod limiting surface on the rear ejection rod is in contact fit with the rear rod blocking surface on the pen body and prevents the rear ejection rod from moving forward, so that a rear rod front limiting structure is formed.

The front shooting rod is provided with a front rod limiting surface, a front rod blocking surface is arranged on the shell or the rear shooting rod corresponding to the front rod limiting surface, and in the forward movement process of the front shooting rod, the front rod limiting surface on the front shooting rod is in contact fit with the front rod blocking surface on the shell or the rear shooting rod and prevents the front shooting rod from moving forward, so that a front rod front limiting structure is formed.

And in the needle unloading state, the distance from the front rod limiting surface to the front rod blocking surface is greater than the distance from the rear rod limiting surface to the rear rod blocking surface.

The relevant content in the above technical solution is explained as follows:

1. in the above-described aspect, the meaning of "front end" and "forward" or "forward" means a direction in which a pen tip of a lancet points or a shooting direction of the lancet. The meaning of the rear part is the direction pointed by the tail of the blood sampling pen or the opposite direction of the shooting direction of the blood sampling needle.

2. In the above-mentioned solution, the "axial direction" refers to the axial direction of the shooting rod, and is also the radial direction of the connecting line between the pen point and the pen tail of the blood sampling pen, or the front-back direction.

3. In the above-described embodiments, the "housing" is a generic term for a fixed (stationary) member relative to a movable member such as a shooting lever. In the invention, the shell is composed of a pen point and a pen body, and the pen point and the pen body can be of an integral connecting structure or of a two-body connecting structure. The two-body connecting structure means that the pen point can be taken down from and put on the pen body. In the prior art, the pen point is required to be taken down from and put on the pen body in order to load and unload the blood taking needle.

4. In the above scheme, there are two situations that the front shooting rod and the rear shooting rod are in sliding fit in the shooting rod axis direction: the first is that the front shooting rod is directly matched with the rear shooting rod in a sliding way, for example, the rear part of the front shooting rod is directly connected with the front part of the rear shooting rod in a sliding way; the second is that the front shooting rod and the rear shooting rod are in indirect sliding fit, for example, the front shooting rod is in sliding fit with a slideway, and the rear shooting rod is also in sliding fit with the slideway, so that the front shooting rod and the rear shooting rod form relative sliding fit.

The design principle and the technical concept of the invention are as follows: in order to solve the problems of multiple operation steps and inconvenient use of the existing blood sampling pen with a detachable pen cap structure, the invention mainly adopts the following improvement measures:

firstly, the original integrated shooting rod is improved and designed into a split type shooting rod consisting of a front shooting rod and a rear shooting rod, and a connecting spring is arranged between the front shooting rod and the rear shooting rod, so that the problem that the original integrated shooting rod cannot be stretched and lengthened in the axis direction is solved, and a novel variable-length type shooting rod design is formed.

And secondly, the needle outlet hole at the front end of the original pen point is improved and designed into a loading and unloading hole through which the blood taking needle can pass, so that the problem of cap-unloading-free passing of the blood taking needle mounted at the front end of the blood taking pen is solved.

Thirdly, a rear rod front limiting structure is designed for the rear injection rod, so that the rear injection rod has a limiting distance in the forward movement.

Fourthly, a front rod front limiting structure is designed for the front shooting rod, so that the front shooting rod has a limiting distance in the forward movement.

Fifthly, in the needle unloading state, the limit distance of the front injection rod is designed to be larger than that of the rear injection rod, so that the problem that the needle seat of the head of the injection rod of the original blood sampling pen cannot convey the blood sampling needle to the position near the front needle outlet hole in the needle unloading state is solved.

Based on the structural characteristics, the blood taking needle can be directly inserted into the needle seat from the assembling and disassembling hole at the front end of the blood taking pen without disassembling a cap for installing the blood taking needle. After the blood sampling pen is used, the needle is detached without detaching the cap according to the following process: referring to FIG. 16, in the needle-removing state, the needle-removing action surface of the needle-removing rod is against the blood collection needle; when the needle unloading rod moves forwards, the front shooting rod, the rear shooting rod and the blood taking needle are driven to integrally move forwards; when the rear rod limiting surface of the rear injection rod is in contact fit with the rear rod blocking surface on the pen body, the rear injection rod is limited and stops moving forwards, and the needle discharging rod continues to drive the front injection rod and the blood taking needle to move forwards; when the front rod limiting surface of the front shooting rod is in contact fit with the front rod blocking surface on the shell or the rear shooting rod, the front shooting rod is limited and stops moving forwards; when the needle removing rod continues to move forwards, the blood taking needle is forced to be separated from the needle seat and extend out of the needle seat, and then the needle cap is inserted and taken out or removed.

Due to the application of the scheme, compared with the prior art, the invention has the following advantages and effects:

1. the invention designs the blood sampling pen which can avoid repeatedly assembling and disassembling a pen cap without influencing the assembling and disassembling of a blood sampling needle, and solves the problems that the blood sampling pen with the original assembling and disassembling pen cap structure has more operation steps and brings inconvenience to use. Overcomes the technical problem in the structural design of the blood taking pen for a long time in the field, and makes a substantial breakthrough on the improvement of the blood taking needle.

2. Compared with the original blood sampling pen, the needle assembling process is reduced to the current one step from the original four steps (see background technical description). The needle removing process is reduced from the original three steps to the current one step. The problem that the pen cap needs to be repeatedly disassembled and assembled in the use of the original blood sampling pen is thoroughly solved, the operation steps are greatly simplified, and great convenience is brought to the use. Breaks through the monopoly position of the detachable pen cap structure in the field of blood sampling pens for a long time.

3. The technical scheme of the invention has reasonable design and ingenious conception, and particularly the design of the length-variable shooting rod has outstanding substantive characteristics and remarkable progress, thereby making substantial contribution to solving the problems of the invention.

Drawings

FIG. 1 is an exploded perspective view of a lancet embodiment of the present invention;

FIG. 2 is a first perspective view of a cap according to an embodiment of the present invention;

FIG. 3 is a second perspective view of a cap according to an embodiment of the present invention;

FIG. 4 is a first perspective exploded view of a firing rod of an embodiment of the lancet of the present invention;

FIG. 5 is a second perspective exploded view of a firing rod of an embodiment of the lancet of the present invention;

FIG. 6 is a front view of a lancet assembly in accordance with an embodiment of the present invention;

FIG. 7 is a top view of an assembled ejection rod of an embodiment of the lancet pen of the present invention;

FIG. 8 is an assembled perspective view of a shoot rod of an embodiment of the lancet of the present invention;

FIG. 9 is a first perspective view of a needle detaching lever according to an embodiment of the lancet device of the present invention;

FIG. 10 is a perspective view of a needle detaching lever of the blood collection pen of the present invention from a second perspective;

FIG. 11 is a first perspective view of a spring sleeve in accordance with an embodiment of the subject lancet;

FIG. 12 is a second perspective view of a spring sleeve in accordance with an embodiment of the present invention;

FIG. 13 is a perspective view of an adjustment ring of an embodiment of the lancet of the present invention;

FIG. 14 is a perspective view of an inner cannula of a lancet embodiment of the present invention;

FIG. 15 is a perspective view of a tail handle of an embodiment of the lancet of the present invention;

FIG. 16 is a schematic diagram of a lancet according to an embodiment of the present invention;

FIG. 17 is a schematic diagram of a blood collection pen according to an embodiment of the present invention;

FIG. 18 is a front end view of an embodiment of the lancet pen of the present invention showing a cross-sectional view A-A;

FIG. 19 is a front end view of a lancet embodiment of the present invention showing a cross-sectional view B-B;

FIG. 20 is a cross-sectional view taken along line A-A of an initial assembled state of a lancet embodiment of the present invention;

FIG. 21 is a cross-sectional view B-B of an initial assembled state of a lancet embodiment of the present invention;

FIG. 22 is a view of a lancet with an embodiment of the lancet pen of the present invention installed therein;

FIG. 23 is a view of the lancet of the present invention with the lancet embodiment further loaded;

FIG. 24 is a sectional view taken along line A-A of the blood collection pen of the present invention after completion of blood collection;

FIG. 25 is a sectional view taken along line B-B of the blood collection pen of the present invention after completion of blood collection;

FIG. 26 is a sectional view taken along line A-A of a first step in needle removal of an embodiment of the lancet of the present invention;

FIG. 27 is a sectional view taken along line B-B of a first needle removal step of a lancet embodiment of the present invention;

FIG. 28 is a perspective view of a first step of needle removal in accordance with the present invention;

FIG. 29 is a sectional view taken along line A-A of a second needle removal step of a lancet embodiment of the present invention;

FIG. 30 is a sectional view taken along line B-B of a second needle removal step of a lancet embodiment of the present invention;

FIG. 31 is a perspective view of a second step of needle removal in accordance with the present invention;

FIG. 32 is a sectional view taken along line A-A of a third step in the needle removal process of the lancet embodiment of the present invention;

FIG. 33 is a sectional view taken along line B-B of a third step in needle removal for a lancet embodiment of the present invention;

FIG. 34 is a perspective view of a third step of needle removal in accordance with the present invention;

FIG. 35 is a schematic view illustrating the completion of needle removal according to the embodiment of the lancet;

FIG. 36 is a schematic view of a lancet according to an embodiment of the present invention recovering a standby state.

In the above drawings: 1. a pen cap; 2. a cap base; 3. a front shooting rod; 4. a rear shooting rod; 5. a connecting spring; 6. an indicator ring; 7. a launch button; 8. a housing; 9. a shooting rod return spring; 10. a firing spring; 11. a spring sleeve; 12. needle removal and return springs; 13. unloading the needle rod; 14. an inner sleeve; 15. a tail handle; 16. a blood collection needle; 17. an adjusting ring; 18. a handle return spring; 19. a needle seat; 20. a front shooting rod hook; 21. a rear injection rod hook; 22. a locking spring arm; 23. removing the needle action surface; 24. a front rod stop face; 25. a needle cap; 26. a loading and unloading hole; 27. a loading stop block; 28. a rear rod blocking face; 29. a rear rod limiting surface; 30. a locking surface; 31. a first sliding connection section; 32. a second sliding connection section; 33. a front rod limiting surface; 34. and a loading limiting surface.

Detailed Description

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

example (b): needle type blood sampling pen capable of being assembled and disassembled without cap disassembly

As shown in fig. 1-15, the blood sampling pen is composed of a pen cap 1, a cap base 2, a shooting rod, an indicating ring 6, a launching button 7, a shell 8, a shooting rod return spring 9, a launching spring 10, a spring sleeve 11, a needle dismounting return spring 12, a needle dismounting rod 13, an inner sleeve 14, a tail handle 15, an adjusting ring 17 and a handle return spring 18 (see fig. 1).

The pen cap 1 is a sleeve type cap of the head part of the blood sampling pen, and the front end of the pen cap 1 is provided with a blood sampling end face (shown in figure 1) for contacting a blood sampling part of a human body. The cap base 2 is a base body (see fig. 2 and 3) which is used for connecting and matching with the pen cap 1 at the front part of the blood sampling pen, and the pen cap 1 is connected with the cap base 2 in a matching way through a connecting port. The shooting rod is a launching part of the blood taking pen (the specific structure of the shooting rod is described in detail later), and the head of the shooting rod is provided with a needle seat 19 for inserting a disposable blood taking needle 16 (see fig. 8). The indicating ring 6 is an indicating window used for displaying whether the current shooting rod of the blood sampling pen is loaded or not. The shell 8 is a part of the shell, and the shell 8 and the cap base 2 are fixedly connected with the pen body. The shell is formed by connecting a pen point and a pen body, wherein the pen point refers to the part of the pen cap 1. An ejection cavity is arranged in the pen head and the pen body, the ejection rod is arranged in the ejection cavity, and a locking structure used for loading and locking the ejection rod is arranged between the ejection rod and the shell. The emission button 7 is installed on the housing 8 for emitting blood. The shooting rod return spring 9 acts on the shooting rod to force the shooting rod to automatically return after shooting and puncturing. The firing spring 10 acts on the firing rod as a power element for the firing penetration of the lancet. The spring sleeve 11 is a tubular member (see fig. 11 and 12) for cooperating with the adjustment collar 17 to achieve penetration depth adjustment. The adjusting ring 17 is a puncture depth adjusting part on the blood sampling pen (see fig. 13). The needle discharging rod 13 is a needle discharging part of the blood sampling pen, and a needle discharging action surface 23 (see fig. 9 and 10) is arranged on the needle discharging rod 13, and the needle discharging action surface 23 is used for pushing and discharging the blood sampling needle 16 arranged on the needle seat 19. The needle release rod 13 is slidably mounted on the housing with the needle release active surface 23 located rearward of the needle hub 19 and in the sliding path of the firing rod. The needle-removing return spring 12 is a spring which acts on the needle-removing rod 13 to return the needle-removing rod after needle removal. The inner sleeve 14 is fixedly sleeved with a tail handle 15 (see fig. 14 and 15) and is used for loading and unloading the shooting rod (pushing the needle unloading rod 13 to unload the needle). The handle return spring 18 acts on the tail handle 15 for return. The spring sleeve 11 and the adjusting ring 17 are matched with the shooting rod to form a puncture depth rear-mounted adjusting structure (see Chinese patent CN 107854129A).

The invention is innovative in that the disposable blood taking needle can be directly assembled and disassembled from the front end of the pen head without detaching the pen cap of the blood taking pen in use, and the embodiment refers to a schematic diagram (I) shown in fig. 16. In order to achieve the aim, the invention adopts the following improvement measures:

firstly, the original integrated shooting rod is improved and designed into a split type shooting rod consisting of a front shooting rod 3 and a rear shooting rod 4, and a connecting spring 5 is arranged between the front shooting rod 3 and the rear shooting rod 4, so that the problem that the original integrated shooting rod cannot be stretched and lengthened in the axis direction is solved, and a new variable-length type shooting rod design is formed. The specific contents are as follows:

the shooting rod consists of a front shooting rod 3, a rear shooting rod 4 and a connecting spring 5 (see fig. 4-8), wherein the front shooting rod 3 and the rear shooting rod 4 are in sliding fit in the axial direction of the shooting rod, and the connecting spring 5 is connected between the front shooting rod 3 and the rear shooting rod 4 and acts in the axial direction of the shooting rod.

The tail of the front shooting rod 3 is provided with a first sliding connection section 31, and the first sliding connection section 31 is provided with a front shooting rod hook 20 (see fig. 4-8). The head of the back shooting rod 4 is provided with a second sliding connection section 32, and the second sliding connection section 32 is provided with a back shooting rod hook 21 (see fig. 4-8). The first sliding connection section 31 is in sliding fit with the second sliding connection section 32, wherein the rear shooting bar hook 21 is located at the front part of the shooting bar axis direction relative to the front shooting bar hook 20, the front end of the connection spring 5 acts on the rear shooting bar hook 21, and the rear end of the connection spring 5 acts on the front shooting bar hook 20. In an assembly state, the front end of the connecting spring 5 abuts against the rear shooting rod hook 21, the rear end of the connecting spring 5 abuts against the front shooting rod hook 20, and the connecting spring 5 is in a compressed state, so that the space between the front shooting rod 3 and the rear shooting rod 4 is not compressed in the shooting rod axis direction and can only be in a stretched state.

Secondly, the needle outlet hole at the front end of the original pen point is improved into a loading and unloading hole 26 through which the blood taking needle can pass, so that the problem of cap-unloading-free passing of the blood taking needle mounted at the front end of the blood taking pen is solved. The specific contents are as follows:

the needle seat 19 is arranged at the head of the forward shooting rod 3, a mounting and dismounting hole 26 which can allow the blood taking needle 16 to pass through is arranged at the front end of the pen point corresponding to the needle seat 19, and the mounting and dismounting hole 26 is just opposite to the needle seat 19 at the head of the forward shooting rod 3. The attachment/detachment hole 26 has a hole shape of a special shape and is matched with the cross-sectional shape and size of the lancet 16. The needle seat 19 is formed by connecting a guide port at the front part and a clamping seat at the rear part, and a moving channel for the needle unloading action surface 23 to slide along the axis direction of the injection rod is arranged at the rear part of the clamping seat.

Thirdly, a rear rod front limiting structure is designed for the rear shooting rod 4, so that the rear shooting rod 4 has a limiting distance in the forward movement. The specific contents are as follows:

the rear shooting rod 4 is provided with a rear rod limiting surface 29 (see fig. 4-8), a rear rod blocking surface 28 (see fig. 11 and 12) is arranged on the spring sleeve 11 (pen body) corresponding to the rear rod limiting surface 29, and in the forward movement process of the rear shooting rod 4, the rear rod limiting surface 29 on the rear shooting rod 4 is in contact fit with the rear rod blocking surface 28 on the spring sleeve 11 (pen body) and prevents the rear shooting rod 4 from moving forward, so that a rear rod forward limiting structure is formed.

In this embodiment, the adjusting ring 17 is rotatably connected to the housing 8, while the spring sleeve 11 is screwed (corresponding to a thread) to the adjusting ring 17 and is simultaneously connected to the housing 8 in an axially sliding manner. When the adjusting collar 17 is turned, the spring sleeve 11 slides axially relative to the housing 8. As the spring sleeve 11 slides axially forward and backward relative to the housing 8, the rear rod stop face 28 provided on the spring sleeve 11 also slides axially forward and backward in the housing 8, thereby changing the position of the rear rod stop face 28 in the axial direction of the housing 8. Due to the change of the axial position of the rear rod blocking surface 28 in the shell 8, when the shooting rod shoots, the rear rod limiting surface 29 on the rear shooting rod 4 is in collision fit with the rear rod blocking surface 28 on the spring sleeve 11, the puncture depth is directly influenced, and finally the purpose of adjusting the puncture depth is achieved. (see Chinese patent CN 107854129A).

Fourthly, a front rod front limiting structure is designed for the front shooting rod 3, so that the front shooting rod 3 has a limiting distance in the forward movement. The specific contents are as follows:

the front shooting rod 3 is provided with a front rod limiting surface 33 (see fig. 4-8 and fig. 16), the inner end surface of the front part of the pen cap 1 (shell) corresponding to the front rod limiting surface 33 is provided with a front rod blocking surface 24 (see fig. 20 and fig. 21), and in the forward movement process of the front shooting rod 3, the front rod limiting surface 33 on the front shooting rod 3 is in contact fit with the front rod blocking surface 24 on the pen cap 1 (shell) and prevents the front shooting rod 3 from moving forward, so that a front rod front limiting structure is formed.

In this embodiment, the front shoot lever 3 is provided with a locking elastic arm 22 (see fig. 4, 6-8), a locking surface 30 (see fig. 16) is provided on the housing corresponding to the locking elastic arm 22, and the locking elastic arm 22 and the locking surface 30 cooperate to form the latch structure.

In this embodiment, the front shooting rod 3 is provided with a loading limiting surface 34 (see fig. 16), a loading stop block 27 (see fig. 16) is provided on the casing corresponding to the loading limiting surface 34, and during the backward movement of the front shooting rod 3, the loading limiting surface 34 on the front shooting rod 3 contacts and engages with the loading stop block 27 on the casing and prevents the front shooting rod 3 from moving backward, thereby forming a front rod backward limiting structure. The rearward movement of the forward firing rod 3 may be caused by two conditions, the first being that the insertion of the lancet 16 causes the rearward movement of the forward firing rod 3, and the second being that the rearward movement of the forward firing rod 3 is caused by the rearward pulling of the tail catch 15.

Fifthly, in the needle unloading state, the limit distance of the front shooting rod 3 is designed to be larger than that of the rear shooting rod 4, so that the problem that the needle seat of the head of the shooting rod of the original blood sampling pen cannot convey the blood sampling needle to the position near the front needle outlet hole in the needle unloading state is solved. The specific contents are as follows:

in the needle-removing state, the distance from the front rod limiting surface 33 to the front rod blocking surface 24 is greater than the distance from the rear rod limiting surface 29 to the rear rod blocking surface 28.

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. structure and principle of the present embodiment

FIG. 16 shows a configuration and a schematic diagram of a lancet device according to an embodiment of the present invention in a state where a lancet 16 is inserted from the front end. The relative positions and relationships between the key components of the present invention can be seen more clearly and in brief in fig. 16. In the figure, the lancet 16 is inserted from the front end and the shooting shaft is directly cocked.

2. Initial assembled state

FIGS. 20-21 show views of the initial assembly of an embodiment of the lancet of the present invention. The relative positions and relationships of the various components in the initial assembled state can be seen in FIGS. 20-21, with the lancet in a ready-to-use condition. The connecting spring 5 between the front shooting rod 3 and the rear shooting rod 4 is in a compressed state, and the front shooting rod 3 and the rear shooting rod 4 are not compressible in the axial direction of the shooting rods and can only be in a stretched state.

3. Needle-mounting state

FIG. 22 shows a state in which the lancet pen of the embodiment of the present invention is mounted in a lancet. In the needle attached state, lancet 16 is inserted into attachment/detachment hole 26 at the tip of the lancet.

4. Needle mounting state is continued

FIG. 23 shows a state in which the lancet is still loaded in the lancet according to the embodiment of the present invention. In the needle loading state, lancet 16 is inserted into needle holder 19 at the head of forward firing rod 3. The ejection rod can be directly loaded and locked in the process of inserting the blood taking needle 16 from the front end, and the locking elastic arm 22 on the front ejection rod 3 is matched with the locking surface 30 on the shell to enable the ejection rod to be in a locking state. However, at the time of secondary use, since there is no process of inserting the lancet 16, the tail catch 15 can be pulled backward to lock the shooting shaft.

5. Blood sampling state

The blood sampling pen is aligned with the blood sampling site, and blood sampling is completed by pressing the firing button 7 (not shown).

6. After the blood sampling is finished, the needle is in a needle-removing state

FIGS. 24-25 are views showing the needle-removing state after the blood collection of the embodiment of the blood collection pen of the present invention is completed. In this state, the relative positions and relationships between the various components can be seen in FIGS. 24-25. In the needle-removing state, the needle-removing action surface 23 of the needle-removing rod 13 butts against the blood collection needle 16, and the blood collection needle 16 is clamped and relatively fixed by the clamping seat at the rear part of the needle seat 19 on the forward shooting rod 3.

7. Needle-removing first step state

FIGS. 26-28 are views showing a first step of needle removal in accordance with the lancet embodiment of the present invention. In this state, the relative positions and relationships between the various components can be seen in FIGS. 26-28. The action process of the first step of needle removal is as follows: the tail handle 15 is pressed (arrow in figures 26-28), the tail handle 15 drives the inner sleeve 14 to move forward, the front end of the inner sleeve 14 is abutted against the tail end of the needle discharging rod 13 (see figure 26), the needle discharging rod 13 is urged to move leftwards until the needle discharging acting surface 23 on the needle discharging rod 13 is abutted against the tail part of the blood taking needle 16 (see figure 26). When the needle discharging rod 13 continues to move forwards, the front shooting rod 3, the rear shooting rod 4 and the blood taking needle 16 are driven to move forwards integrally. When the rear rod stopper surface 29 of the rear shooting rod 4 is in contact engagement with the rear rod stopper surface 28 on the spring sleeve 11, the rear shooting rod 4 is stopped and stops moving forward.

8. Second stage state of needle removal

FIGS. 29-31 are views showing the second step of needle removal in accordance with the lancet embodiment of the present invention. In this state, the relative positions and relationships between the various components can be seen in FIGS. 29-31. The second step of needle removal comprises the following steps: since the rear shaft stopper surface 29 of the rear shooting shaft 4 is caught by the rear shaft stopper surface 28 of the spring sleeve 11 (see fig. 30), it cannot move leftward, and the lancet 16 is held by the needle holder 19 of the front shooting shaft 3 (see fig. 30). The tail handle 15 is continuously pressed (replaced by an arrow), the needle discharging rod 13 continuously moves leftwards, the needle discharging acting surface 23 on the needle discharging rod 13 is abutted against the tail end of the blood taking needle 16 and moves leftwards together to separate the front shooting rod 3 from the rear shooting rod 4 (see fig. 29), at this time, the needle discharging rod 13 continuously drives the front shooting rod 3 and the blood taking needle 16 to move forwards until the front rod limiting surface 33 of the front shooting rod 3 is contacted and matched with the front rod blocking surface 24 inside the pen cap 1, and the front shooting rod 3 is limited and stops moving forwards (see fig. 30). At this time, the needle tip of the lancet 16 is completely exposed, and the needle cap 25 is conveniently inserted.

9. Needle-removing state in the third step

FIGS. 32-34 are state views illustrating a third step of needle removal in accordance with the lancet embodiment of the present invention. In this state, the relative positions and relationships between the various components can be seen in FIGS. 32-34. The action process of the third step of needle removal is as follows: the tail handle 15 is continuously pressed to force the tail part of the blood taking needle 16 to be disengaged from the hook of the needle seat 19 of the front shooting rod 3 (see figure 33), at the moment, the front shooting rod 3 is influenced by the connecting spring 5 to move rightwards (see figure 33), the natural connection state is recovered, the blood taking needle 16 is not clamped by the needle seat 19 of the front shooting rod 3 any more, and the needle unloading action is completed.

10. Needle-removal completed state

FIG. 35 is a view showing a state where needle removal is completed in the lancet device according to the embodiment of the present invention.

11. Restoring the state of standby

FIG. 36 shows a view of the lancet of the present invention recovering the standby state.

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

1. in the above embodiments, the cap 1 and the cap base 2 are two-body structures and are connected by matching through the connection port, wherein the cap 1 represents a pen head, and the cap base 2 and the housing 8 represent a pen body. In other words, the shell is formed by connecting the pen head and the pen body from the perspective of the shell of the blood sampling pen. The invention is not limited to this, and the pen cap 1 and the cap base 2 are designed into an integral structure, i.e. the pen cap 1 is not detachable. As will be readily understood by those skilled in the art.

2. In the above embodiment, in the assembled state of the blood sampling pen, the front end of the connecting spring 5 abuts against the rear shoot rod hook 21, the rear end of the connecting spring 5 abuts against the front shoot rod hook 20, and the connecting spring 5 is in a compressed state, so that the space between the front shoot rod 3 and the rear shoot rod 4 is in an incompressible state and only in a tensile state in the shoot rod axis direction (see fig. 16). However, the present invention is not limited thereto, and the connection relationship of the connection spring 5 with the front shooting rod 3 and the rear shooting rod 4 may be changed to: the front end of the connecting spring 5 is positioned and connected on the front shooting rod 3, and the rear end of the connecting spring 5 is positioned and connected on the rear shooting rod 4 (see figure 17). In this connection, the front rod 3 and the rear rod 4 may be compressed or incompressible by a certain amount in the direction of the axis of the rod, but may be stretched in the direction of the axis of the rod.

3. In the above embodiment, the front rod 3 is provided with the front rod limiting surface 33, the front rod blocking surface 24 is provided on the inner end surface of the front portion of the pen cap 1 corresponding to the front rod limiting surface 33, and during the forward movement of the front rod 3, the front rod limiting surface 33 contacts and engages with the front rod blocking surface 24 and blocks the forward movement of the front rod 3, thereby forming the front rod front limiting structure. However, the present invention is not limited to this, and the front rod blocking surface 24 may be provided on the rear shooting rod 4. Such variations have the same technical effect on the present invention, as will be readily understood by those skilled in the art.

4. In the above embodiment, the locking elastic arm 22 is provided on the forward shooting lever 3. However, the present invention is not limited thereto, and the locking elastic arm 22 may be formed on the back fire lever 4. Such variations have the same technical effect on the present invention, as will be readily understood by those skilled in the art.

5. The above embodiments are provided to illustrate the principle, structure and effect of the present invention by taking a lancet with a rear-mounted puncturing depth adjustment as an example. The present invention is not limited thereto, and may be applied to a lancet in which the front head is impact-adjusted, and even to a lancet in which the penetration depth is not adjustable, as will be understood by those skilled in the art.

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

1. A cap-removal-free needle-assembling and disassembling blood sampling pen comprises a shooting rod, a needle-disassembling rod (13) and a shell;

the shooting rod is a launching part of the blood sampling pen, and the head part of the shooting rod is provided with a needle seat (19) for inserting a disposable blood sampling needle (16);

the needle unloading rod (13) is a needle unloading part of the blood sampling pen, a needle unloading action surface (23) is arranged on the needle unloading rod (13), and the needle unloading action surface (23) is used for pushing and unloading the blood sampling needle (16) arranged on the needle seat (19);

the casing is formed by connecting a pen head and a pen body or integrally connecting the pen head and the pen body, an ejection cavity is formed in the pen head and the pen body, the ejection rod is arranged in the ejection cavity, and a locking structure for loading and locking the ejection rod is arranged between the ejection rod and the casing; the needle unloading rod (13) is arranged on the shell in a sliding way, wherein the needle unloading action surface (23) is positioned at the rear part of the needle seat (19) and is positioned on the sliding path of the shooting rod;

the method is characterized in that: the shooting rod consists of a front shooting rod (3), a rear shooting rod (4) and a connecting spring (5), the front shooting rod (3) and the rear shooting rod (4) are in sliding fit in the axis direction of the shooting rod, and the connecting spring (5) is connected between the front shooting rod (3) and the rear shooting rod (4) and acts on the axis direction of the shooting rod;

the needle seat (19) is arranged at the head of the front shooting rod (3), a mounting and dismounting hole (26) through which the blood taking needle (16) can pass is formed in the front end of the pen point corresponding to the needle seat (19), and the mounting and dismounting hole (26) is over against the needle seat (19) at the head of the front shooting rod (3);

the rear shooting rod (4) is provided with a rear rod limiting surface (29), a rear rod blocking surface (28) is arranged on the pen body corresponding to the rear rod limiting surface (29), and in the forward movement process of the rear shooting rod (4), the rear rod limiting surface (29) on the rear shooting rod (4) is in contact fit with the rear rod blocking surface (28) on the pen body and prevents the rear shooting rod (4) from moving forward, so that a rear rod front limiting structure is formed;

the front shooting rod (3) is provided with a front rod limiting surface (33), a front rod blocking surface (24) is arranged on the shell or the rear shooting rod (4) corresponding to the front rod limiting surface (33), and in the forward movement process of the front shooting rod (3), the front rod limiting surface (33) on the front shooting rod (3) is in contact fit with the front rod blocking surface (24) on the shell or the rear shooting rod (4) and prevents the front shooting rod (3) from moving forward, so that a front rod front limiting structure is formed;

in the needle-removing state, the distance from the front rod limiting surface (33) to the front rod blocking surface (24) is greater than the distance from the rear rod limiting surface (29) to the rear rod blocking surface (28).

2. The lancing pen according to claim 1, wherein: in the needle unloading state, the needle unloading acting surface (23) of the needle unloading rod (13) props against the blood taking needle (16); when the needle unloading rod (13) moves forwards, the front shooting rod (3), the rear shooting rod (4) and the blood taking needle (16) are driven to move forwards integrally; when the rear rod limiting surface (29) of the rear shooting rod (4) is in contact fit with the rear rod blocking surface (28) on the pen body, the rear shooting rod (4) is limited and stops moving forwards, and the needle discharging rod (13) continues to drive the front shooting rod (3) and the blood taking needle (16) to move forwards; when the front rod limiting surface (33) of the front shooting rod (3) is in contact fit with the front rod blocking surface (24) on the shell or the rear shooting rod (4), the front shooting rod (3) is limited and stops moving forwards; at the moment, when the needle discharging rod (13) continues to move forwards, the blood taking needle (16) is forced to be separated from the needle seat (19) and extend out of the needle discharging hole (26).

3. The lancing pen according to claim 1, wherein: the tail part of the front shooting rod (3) is provided with a first sliding connection section (31), and the first sliding connection section (31) is provided with a front shooting rod hook (20); the head of the rear shooting rod (4) is provided with a second sliding connection section (32), and the second sliding connection section (32) is provided with a rear shooting rod hook (21); the first sliding connection section (31) is in sliding fit with the second sliding connection section (32), wherein the rear shooting rod hook (21) is located in the front of the axis direction of the shooting rod relative to the front shooting rod hook (20), the front end of the connection spring (5) acts on the rear shooting rod hook (21), and the rear end of the connection spring (5) acts on the front shooting rod hook (20).

4. The lancing pen according to claim 3, wherein: in an assembly state, the front end of the connecting spring (5) abuts against the rear shooting rod clamping hook (21), the rear end of the connecting spring (5) abuts against the front shooting rod clamping hook (20), and the connecting spring (5) is in a compressed state, so that the front shooting rod (3) and the rear shooting rod (4) are in an incompressible state and only in a stretching state in the axis direction of the shooting rod.

5. The lancing pen according to claim 1, wherein: the front end of the connecting spring (5) is positioned and connected on the front shooting rod (3), and the rear end of the connecting spring (5) is positioned and connected on the rear shooting rod (4).

6. The lancing pen according to claim 1, wherein: the front shooting rod (3) or the rear shooting rod (4) is provided with a locking elastic arm (22), a locking surface (30) is arranged on the shell corresponding to the locking elastic arm (22), and the locking elastic arm (22) and the locking surface (30) are matched to form the locking structure.

7. The lancing pen according to claim 1, wherein: the front shooting rod (3) is provided with a loading limiting face (34), a loading blocking block (27) is arranged on the shell corresponding to the loading limiting face (34), and in the backward movement process of the front shooting rod (3), the loading limiting face (34) on the front shooting rod (3) is in contact fit with the loading blocking block (27) on the shell and prevents the front shooting rod (3) from moving backward, so that a front rod backward limiting structure is formed.

8. The lancing pen according to claim 1, wherein: the hole shape of the assembling and disassembling hole (26) is a special shape and is matched with the section shape and size of the blood taking needle (16).

9. The lancing pen according to claim 1, wherein: the needle seat (19) is formed by connecting a guide port at the front part and a clamping seat at the rear part, and a movement channel for the needle unloading action surface (23) to slide along the axial direction of the injection rod is arranged behind the clamping seat.