CN115154770A - Manually-locked insulin injection needle - Google Patents

Abstract

The utility model provides an insulin syringe needle of manual locking, includes needle file, needle body, preceding sleeve and spring, its characterized in that: the rotary positioning locking structure mainly comprises an axial first positioning surface and a circumferential first positioning surface which are arranged on the needle base, and an axial second positioning surface and a circumferential second positioning surface which are arranged on the front sleeve. The front sleeve is located at the front end limiting position relative to the needle seat, the front sleeve is manually rotated, and when a circumferential second positioning surface on the front sleeve is in contact positioning with a circumferential first positioning surface on the needle seat, an axial second positioning surface on the front sleeve is opposite to an axial first positioning surface on the needle seat in a face-to-face mode, so that the front sleeve is positioned and locked on the needle seat, and safety protection aiming at a needle point at the front end of a needle body is formed. The potential safety hazard problem that current manual safety protection islet injection syringe needle exists is solved to this scheme.

Description

Manually-locked insulin injection needle

Technical Field

The invention relates to a medical insulin injection tool, in particular to a manually-locked insulin injection needle. The injection needle can be used together with an insulin pen for self-administration or administration by others, wherein the insulin pen can be repeatedly used, and the injection needle is a disposable needle. The injection needle has the characteristics of safety protection of the needle point after use through manual locking, simple structure, low cost, safety and reliability.

Background

Diabetes is a metabolic disease characterized by hyperglycemia, and no radical treatment method exists at present, but the condition can be effectively controlled by injecting insulin into a patient.

The common insulin injection tool is composed of an insulin injection needle and an insulin injection pen which are matched for use, wherein the insulin injection pen carries a specified amount of insulin liquid medicine and can be repeatedly used, and the insulin injection needle is a disposable needle. The traditional insulin injection needle is formed by fixedly connecting a needle body and a needle seat, has simple structure and low cost, but has no protection device, and the exposed needle point is easy to accidentally injure fingers and cause cross infection. In order to solve the safety problem of the conventional insulin injection needle, a plurality of insulin injection needles with safety protection sleeve devices are designed by the technical personnel in the field. Such products are generally classified into two main categories, the first category being manual safety-protected islet injection needles, and the second category being automatic safety-protected islet injection needles. Automatic safety protection products are complex in structure and high in cost, belong to high-grade medical consumables, manual safety protection products are between traditional products and high-grade products, are relatively simple in structure and low in cost, and belong to safety products popular with consumers.

A patent of a utility model named "an insulin automatic retraction protective needle", with a patent application number of 202120554224.2, was published in 2021 by CN215024119U at 07/12/2021. The patent name is an insulin automatic retraction protective needle, but the manual safety protection type insulin injection needle is actually used after a specification is checked, and safety protection can be realized only through manual operation. As a manual safety protection islet injection needle, although the structure of the patent is simple and the cost is relatively low, the patent has the following defects: the protective cap only depends on the action force of the spring under the state of protecting the needle head and does not enter the locking state, if the protective cap is pressed or touched, the protective cap can still be forced to move and break away from the protection state, and the design has potential safety hazard from the safety perspective.

Therefore, how to improve the existing manual safety protection insulin injection needle, and overcome the defects of safety while maintaining the advantages of simple structure, low cost and the like is a problem to be considered in the invention.

Disclosure of Invention

The invention provides a manually-locked insulin injection needle, and aims to solve the problem of potential safety hazard of the conventional manually-safely-protected insulin injection needle.

In order to achieve the purpose, the invention adopts the technical scheme that: a manually locked insulin injection needle comprising:

the front part of the needle seat is provided with a positioning column, and the rear part of the needle seat is provided with an interface for connecting an insulin pen.

The front end of the needle body is an injection section, the rear end of the needle body is a connecting section, the needle body is fixed on the positioning column, the injection section extends forwards from the front end of the positioning column, and the connecting section extends into the connector from the rear end of the positioning column.

The front sleeve is used for protecting an injection section of a needle body, the main structure of the front sleeve is a tube body, the front sleeve is in axial sliding fit with the needle seat, the front sleeve is provided with a front end limiting position relative to the needle seat in the sliding direction, and the front sleeve is in circumferential rotation fit with the needle seat in the front end limiting position.

The innovation is as follows: the needle base is provided with an axial first positioning surface facing to the axial front, and an axial second positioning surface facing to the axial rear is arranged on the front sleeve corresponding to the axial first positioning surface. The center of the axial first positioning surface and the center of the axial second positioning surface are positioned on the path of the front sleeve with the same rotating radius relative to the needle seat.

The needle base is provided with a circumferential first positioning surface facing to a circumferential clockwise rotation direction or an anticlockwise rotation direction, a circumferential second positioning surface is arranged on the front sleeve corresponding to the circumferential first positioning surface, and the circumferential second positioning surface faces to the circumferential anticlockwise rotation direction or the clockwise rotation direction. The center of the circumferential first positioning surface and the center of the circumferential second positioning surface are positioned on a path of the front sleeve with the same rotating radius relative to the needle seat.

In the circumferential direction in the assembled state, the phase difference between the center of the axial first positioning surface and the center of the axial second positioning surface is equal to the phase difference between the center of the circumferential first positioning surface and the center of the circumferential second positioning surface.

The front sleeve is located at the front end limiting position relative to the needle seat, the front sleeve is manually rotated, and when a circumferential second positioning surface on the front sleeve is in contact positioning with a circumferential first positioning surface on the needle seat, an axial second positioning surface on the front sleeve is opposite to an axial first positioning surface on the needle seat in a face-to-face mode, so that the front sleeve is positioned and locked on the needle seat, and safety protection aiming at a needle point at the front end of a needle body is formed.

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

1. in the above embodiment, the "front" of the "front end", "front", "forward" and "forward" refers to the direction pointed by the needle tip of the safety insulin injection needle of the present invention. The rear in the rear end, the rear part and the rear part refers to the opposite direction of the front.

2. In the above scheme, the insulin injection needle can further comprise an outer sleeve which is of a sleeve structure and sleeved outside the needle seat and the front sleeve for protecting the whole insulin injection needle. In the present invention, since the outer jacket is not related to the innovative point, it is omitted in both the description and the drawings. The present invention may also include a tail cap to protect the needle hub. Since the tail cap is irrelevant to the innovative point of the present invention, it is omitted in both the description and the drawings. This is also why open language is used in the claims.

3. In the above scheme, a transition surface is arranged for the axial first positioning surface or/and the axial second positioning surface, the transition surface is an inclined surface or an arc surface, the transition surface is located beside the axial first positioning surface or/and the axial second positioning surface and connected with the axial first positioning surface or/and the axial second positioning surface, and the center of the transition surface and the center of the axial first positioning surface or the center of the axial second positioning surface are located on the same rotation radius path.

When the axial first positioning surface and the axial second positioning surface are in a staggered state in the circumferential direction, the center of the axial first positioning surface and the center of the axial second positioning surface are staggered front and back in the axial projection position, and the staggered length front and back falls in the axial projection length range of the transition surface.

4. In the above scheme, the first circumferential locating surface is located beside the first axial locating surface and forms an angle with the first axial locating surface, the center of the first circumferential locating surface and the center of the first axial locating surface are located on a path with the same rotating radius, and the center of the first circumferential locating surface is located in front of the center of the first axial locating surface in the axial projection position at the axial projection position.

The circumferential second positioning surface is located beside the axial second positioning surface and forms an angle with the axial second positioning surface, the center of the circumferential second positioning surface and the center of the axial second positioning surface are located on a path with the same rotating radius, and the center of the circumferential second positioning surface is located in front of the center of the axial second positioning surface in the axial projection position at the axial projection position.

5. In the above scheme, be equipped with the locking groove on the needle file, the locking groove is groove structure and towards the place ahead, the first locating surface of axial is the bottom surface in locking groove, and the first locating surface of circumference is the side in locking groove. The front sleeve is provided with a locking column which is of a protruding structure and faces the rear side, the axial second positioning surface is the top surface of the locking column, and the circumferential second positioning surface is the side surface of the locking column. The transition surface is arranged on the outer side of the locking groove or/and the side part of the locking column.

6. In the scheme, the locking groove is formed in the end face of the front end of the positioning column of the needle seat. An inner ring protruding towards the center direction is arranged on the inner wall of the front sleeve, and the locking column is located on the inner ring and faces the rear.

7. In the above scheme, be equipped with the locking post on the needle file, the locking post is protruding structure and towards the place ahead, the first locating surface of axial is the top surface of locking post, and the first locating surface of circumference is the side of locking post. Be equipped with the locking groove on the preceding sleeve pipe, the locking groove is groove structure and towards the rear, axial second locating surface is the bottom surface in locking groove, and circumference second locating surface is the side in locking groove. The transition surface is arranged on the outer side of the locking groove or/and the side part of the locking column.

8. In the above scheme, the inner wall of the front sleeve is provided with an inner ring protruding towards the central direction, and the locking groove is arranged on the inner ring. The locking column is arranged on the front end face of the positioning column of the needle seat.

9. In the above scheme, an extension sleeve is arranged at the periphery of the positioning column, the extension sleeve is of a sleeve structure, and the sleeve and the positioning column have the same axis and are of an integrated structure; the front sleeve and the extension sleeve are in axial sliding fit and are in circumferential rotation fit.

10. In the above scheme, the rear part of the front sleeve is inserted into the extension sleeve, the outer edge of the front sleeve is provided with an outer edge retainer ring, the inner edge of the extension sleeve is provided with an inner edge retainer ring, and when the front sleeve slides forwards relative to the extension sleeve, the inner edge retainer ring and the outer edge retainer ring are matched to form the front end limiting position.

11. In the above scheme, the needle base is provided with a first step surface, the first step surface comprises a front surface and a side surface, the axial first positioning surface is the front surface of the first step surface, and the circumferential first positioning surface is the side surface of the first step surface. The front sleeve is provided with a second step surface, the second step surface comprises a front surface and a side surface, the axial second positioning surface is the front surface of the second step surface, and the circumferential second positioning surface is the side surface of the second step surface. The transition surface is arranged on the side surface of the first step surface or/and the side surface of the second step surface.

The design principle and the technical concept of the invention are as follows: in order to solve the potential safety hazard problem of the prior manual safety protection insulin injection needle, the invention designs a rotary positioning locking structure between a needle seat and a front sleeve on the basis of the prior art, and the rotary positioning locking structure mainly comprises an axial first positioning surface and a circumferential first positioning surface which are arranged on the needle seat, and an axial second positioning surface and a circumferential second positioning surface which are arranged on the front sleeve. The front sleeve is located at the front end limiting position relative to the needle seat, the front sleeve is manually rotated, and when a circumferential second positioning surface on the front sleeve is in contact positioning with a circumferential first positioning surface on the needle seat, an axial second positioning surface on the front sleeve is opposite to an axial first positioning surface on the needle seat in a face-to-face mode, so that the front sleeve is positioned and locked on the needle seat, and safety protection aiming at a needle point at the front end of a needle body is formed.

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

1. the structure is simple. Compared with the prior art (a comparison document in the background), the invention does not add any part and mould, but increases the locking function under the protection state through structural improvement, further improves the safety of the insulin injection needle head, and eliminates the potential safety hazard in the prior art.

2. The conception is ingenious. The invention designs a simple and reliable rotation positioning locking structure between the needle base and the front sleeve by utilizing the rotation matching relationship of the front sleeve and the needle base under the state of the front end limiting position. Thereby skillfully solving the safety problem provided by the invention. Although the rotary positioning locking structure is not complicated, the rotary positioning locking structure has remarkable effect and substantial characteristics.

3. The use is more convenient. The invention can be directly used, and the front sleeve can be locked only by rotating after use. The insulin injection needle in the comparison file can be used only after the protective cap is pulled down and rotationally fixed, and the protective cap can be separated only by reversely rotating and releasing the fixation after the use.

4. The protection is more effective. The invention can be locked by rotating the front sleeve after use, thereby forming effective protection. The protective cap is a false protection after the insulin injection needle head is used in the comparison file, and people can still be injured after being touched, so that potential safety hazards exist.

5. With a lock alert tone. When the axial second positioning surface on the front sleeve climbs to face and press with the axial first positioning surface on the needle base through the transition surface (see embodiment 1), a prompt sound is generated to indicate that the locking state is achieved. Whereas the insulin injection needle in the reference did not have this effect.

Drawings

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

FIG. 2 is an exploded perspective view of embodiment 1 of the present invention;

FIG. 3 is a perspective view of a front sleeve from a rear end view in accordance with embodiment 1 of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at F;

FIG. 5 is a front sleeve in accordance with example 1 of the present invention, from a front perspective;

FIG. 6 is a perspective view of a needle holder according to embodiment 1 of the present invention;

FIG. 7 is a front view of embodiment 1 of the present invention in an initial state;

FIG. 8 isbase:Sub>A sectional view A-A of FIG. 7;

FIG. 9 is a perspective view showing an initial state of embodiment 1 of the present invention;

FIG. 10 is a perspective view showing a state in which the front socket is pressed to the bottom in embodiment 1 of the present invention;

FIG. 11 is a perspective view showing a sleeve shape before rotation in accordance with embodiment 1 of the present invention;

FIG. 12 is a perspective sectional view showing a state of the sleeve before rotation in embodiment 1 of the present invention;

FIG. 13a is a perspective view showing a locked state of a front sleeve in accordance with embodiment 1 of the present invention;

FIG. 13b is a sectional view showing a locked state of the front sleeve in accordance with embodiment 1 of the present invention;

fig. 14 is a schematic diagram of an axial first positioning surface and an axial second positioning surface which are staggered in embodiment 1 of the present invention;

FIG. 15 is a perspective view of embodiment 2 of the present invention;

FIG. 16 is an exploded perspective view of embodiment 2 of the present invention;

FIG. 17 is a front sleeve perspective view in accordance with embodiment 2 of the present invention;

FIG. 18 is an enlarged view of a portion G of FIG. 17;

FIG. 19 is a perspective view of a needle holder in accordance with embodiment 2 of the present invention;

FIG. 20 is an enlarged view of portion H of FIG. 19;

FIG. 21 is a front view of embodiment 2 of the present invention in an initial state;

FIG. 22 is a cross-sectional view B-B of FIG. 21;

FIG. 23 is a perspective view showing a locked state of a front sleeve in accordance with embodiment 2 of the present invention;

FIG. 24 is a perspective C-C sectional view of FIG. 23;

FIG. 25 is a perspective view showing an initial state of embodiment 2 of the present invention;

FIG. 26 is an enlarged fragmentary view of FIG. 25;

FIG. 27 is a perspective view showing a state in which the front socket is pressed to the bottom in embodiment 2 of the present invention;

FIG. 28 is an enlarged fragmentary view of FIG. 27;

FIG. 29 is a perspective view showing a locked state of a front sleeve in accordance with embodiment 2 of the present invention

FIG. 30 is an enlarged fragmentary view of FIG. 29;

FIG. 31 is an exploded perspective view of embodiment 3 of the present invention;

FIG. 32 is a perspective view of a front sleeve according to example 3 of the present invention.

In the above drawings: 1. a needle seat; 2. a front sleeve; 3. a spring; 4. a needle body; 5. a positioning column; 6. an interface; 7. an axial first locating surface; 8. an axial second locating surface; 9. a transition surface; 10. a circumferential first locating surface; 11. a circumferential second positioning surface; 12. a locking post; 13. an inner ring; 14. an outer edge retainer ring; 15. an extension sleeve; 16. an inner edge retainer ring; 17. a locking groove; 18. a first step surface; 19. a second step surface; 20. a support sheet; 21. a guide rib; 22. a guide groove; 23. positioning a groove; 24. a limiting groove; 25. a limiting column; s1, staggering length; and S2, projecting length.

Detailed Description

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

example 1: manually-locked insulin injection needle

As shown in fig. 1-14, the manually locked insulin injection needle is composed of a needle hub 1, a needle body 4, a front cannula 2 and a spring 3 (see fig. 1 and 2). Wherein, each part and the structure thereof are as follows:

the front part of the needle base 1 is provided with a positioning column 5 (see figures 6 and 8), and the rear part of the needle base 1 is provided with a connector 6 (see figure 8) for connecting an insulin pen.

The front end of the needle body 4 is an injection section, the rear end of the needle body 4 is a connection section, the needle body 4 is fixed on the positioning column 5 (see fig. 8), the injection section extends forwards from the front end of the positioning column 5, and the connection section extends into the interface 6 from the rear end of the positioning column 5 (see fig. 8).

The front sleeve 2 is used for protecting the injection section of the needle body 4, the main structure of the front sleeve 2 is a tube body (see fig. 3 and 8), the front sleeve 2 is in axial sliding fit with the needle base 1 (see fig. 8), the front sleeve 2 has a front end limiting position (see fig. 8) relative to the needle base 1 in the sliding direction, and the front sleeve 2 is in circumferential rotation fit with the needle base 1.

A spring 3, which spring 3 is a helical spring and acts in the sliding direction between the front cannula 2 and the needle hub 1 (see fig. 8).

The innovation of the invention is that a rotary positioning locking structure is designed between the needle base 1 and the front sleeve 2. The rotary positioning locking structure mainly comprises the following structures and structures:

the needle holder 1 is provided with an axial first positioning surface 7 (see fig. 6), and the axial first positioning surface 7 faces to the axial front. The front sleeve 2 is provided with an axial second positioning surface 8 (see fig. 4) corresponding to the axial first positioning surface 7, the axial second positioning surface 8 facing axially rearward. The center of the axial first locating surface 7 and the center of the axial second locating surface 8 are on the same rotation radius path of the front sleeve 2 relative to the needle seat 1.

The needle seat 1 is provided with a circumferential first positioning surface 10 (see fig. 6), the circumferential first positioning surface 10 faces to a circumferential clockwise rotation direction or an anticlockwise rotation direction, a circumferential second positioning surface 11 (see fig. 4) is arranged on the front sleeve 2 corresponding to the circumferential first positioning surface 10, and the circumferential second positioning surface 11 faces to the circumferential anticlockwise rotation direction or the clockwise rotation direction. The center of the circumferential first locating surface 10 and the center of the circumferential second locating surface 11 are on the same path of the rotation radius of the front cannula 2 relative to the needle seat 1.

In the circumferential direction in the assembled state, the phase difference between the center of the axial first positioning surface 7 and the center of the axial second positioning surface 8 is equal to the phase difference between the center of the circumferential first positioning surface 10 and the center of the circumferential second positioning surface 11.

A transition surface 9 is provided for the axial second positioning surface 8, the transition surface 9 is an inclined surface (see fig. 4), the transition surface 9 is located beside the axial second positioning surface 8 and connected with the axial second positioning surface 8 (see fig. 4), and the center of the transition surface 9 and the center of the axial second positioning surface 8 are located on a path with the same rotation radius (see fig. 4).

The circumferential first positioning surface 10 is located beside the axial first positioning surface 7 and forms an angle with the axial first positioning surface 7, the center of the circumferential first positioning surface 10 and the center of the axial first positioning surface 7 are located on a path with the same rotating radius (see fig. 6), and the axial projection position of the center of the circumferential first positioning surface 10 is located in front of the axial projection position of the center of the axial first positioning surface 7.

The circumferential second positioning surface 11 is located beside the axial second positioning surface 8 and forms an angle with the axial second positioning surface 8, the center of the circumferential second positioning surface 11 and the center of the axial second positioning surface 8 are located on a path with the same rotating radius (see fig. 4), and the center of the circumferential second positioning surface 11 is located in front of the axial projection position of the center of the axial second positioning surface 8 at the axial projection position.

When the front sleeve 2 is located at the front end limiting position (see fig. 8) relative to the needle base 1, the axial first positioning surface 7 and the axial second positioning surface 8 are in a staggered state in the circumferential direction, the center of the axial first positioning surface 7 and the center of the axial second positioning surface 8 are staggered front and back in the axial projection position, the staggered length S1 front and back falls within the range of the axial projection length S2 of the transition surface 9 (see fig. 14), when the front sleeve 2 is manually rotated in the state, the axial second positioning surface 8 on the front sleeve 2 climbs to be in a face-to-face jacking state with the axial first positioning surface 7 on the needle base 1 through the transition surface 9, and meanwhile, the circumferential second positioning surface 11 is in contact positioning with the circumferential first positioning surface 10.

In the invention, the transition surface 9 is a working inclined surface or a cambered surface when the front sleeve 2 is rotationally locked, because the front sleeve 2 is located at a front end limiting position relative to the needle base 1 before locking, and the axial first positioning surface 7 and the axial second positioning surface 8 are in a staggered state in the circumferential direction, the axial first positioning surface 7 and the axial second positioning surface 8 are staggered front and back in the axial direction, and when the front sleeve 2 is rotated, the axial second positioning surface 8 on the front sleeve 2 climbs to be pressed against the axial first positioning surface 7 on the needle base 1 through the transition surface 9. The transition surface 9 enables both the axial first positioning surface 7 and the axial second positioning surface 8 to be switched from a misaligned state to a pressed state. Under the jacking state, the front sleeve 2 can not retract backwards relative to the needle base 1 any more, and the front sleeve 2 is forced to be in a locking state relative to the needle base 1.

In the present exemplary embodiment, in the unlocked state, the first axial positioning surface 7 and the second axial positioning surface 8 are staggered back and forth in the axial direction. That is, the axial first positioning surface 7 is rearward and the axial second positioning surface 8 is forward in the locked state, and they are opposite to each other in a face-to-face manner, while the axial first positioning surface 7 is forward and the axial second positioning surface 8 is rearward in the unlocked state, and they have a staggered amount, i.e., a staggered length in the forward and backward directions. The staggering is intended to ensure that, in the locked state, there is a pressing force between the first axial positioning surface 7 and the second axial positioning surface 8, which pressing force ensures the reliability of the locking. This amount of staggering is generally not too great, otherwise it is difficult for the axial second positioning surface 8 to climb over the transition surface 9 into face-to-face abutment with the axial first positioning surface 7. This is why it is necessary to have a staggered length in front and back which falls within the axial projection length of the transition surface 9. However, such back-and-forth interlacing is not essential to the present invention and may be absent.

In this embodiment, a locking groove 17 (see fig. 6) is provided on the needle holder 1, the locking groove 17 is a groove structure and faces forward, the axial first positioning surface 7 is a bottom surface of the locking groove 17, and the circumferential first positioning surface 10 is a side surface of the locking groove 17 (see fig. 6). The front sleeve 2 is provided with a locking column 12 (see fig. 3), the locking column 12 is of a convex structure and faces towards the rear, the axial second positioning surface 8 is the top surface of the locking column 12, and the circumferential second positioning surface 11 is the side surface of the locking column 12 (see fig. 4). The transition surface 9 is provided on the side of the locking stud 12 (see fig. 3 and 4). The locking grooves 17 are provided on the front end face of the positioning column 5 of the needle holder 1 (see fig. 6), and the locking grooves 17 are formed in two and are arranged symmetrically in the circumferential direction (see fig. 6). The inner wall of the front sleeve 2 is provided with an inner ring 13 (see fig. 3) projecting toward the center, the locking posts 12 are seated on the inner ring 13 and directed rearward (see fig. 3 and 8), and the locking posts 12 are formed in two and are symmetrically arranged in the circumferential direction (see fig. 3).

In the present embodiment, in order to ensure that the front sleeve 2 is in sliding fit with the needle seat 1 in the axial direction, the front sleeve 2 is in rotating fit with the needle seat 1 in the circumferential direction. An extension sleeve 15 (see fig. 6 and 8) is arranged on the periphery of the positioning column 5 of the needle holder 1, and the extension sleeve 15 is of a sleeve structure, is coaxial with the positioning column 5, and is of an integral molding structure with the positioning column 5. The front sleeve 2 is in sliding engagement with the extension sleeve 15 in the axial direction while being in rotational engagement in the circumferential direction. The rear part of the front sleeve 2 is inserted into an extension sleeve 15 (see fig. 8), an outer edge retainer ring 14 is arranged on the outer edge of the front sleeve 2, an inner edge retainer ring 16 (see fig. 8) is arranged on the inner edge of the extension sleeve 15, and when the front sleeve 2 slides forwards relative to the extension sleeve 15, the inner edge retainer ring 16 and the outer edge retainer ring 14 are matched to form the front end limiting position.

The following describes the process of using the embodiment 1 of the present invention with reference to the accompanying drawings:

1. initial state

Fig. 7 isbase:Sub>A front view of an initial state, fig. 8 isbase:Sub>A cross-sectional view of an initial statebase:Sub>A-base:Sub>A, and fig. 9 isbase:Sub>A perspective view of the initial state. As can be seen from fig. 8, the front cannula 2 is in the front end limiting position, the inner edge retainer 16 on the inner edge of the extension sleeve 15 is matched with the outer edge retainer 14 on the front cannula 2, and the spring 3 is pressed against the axial direction of the front cannula 2 and the needle holder 1. As can be seen from fig. 9, in the initial state, the pair of lock grooves 17 (two) is displaced from the pair of lock posts 12 (two) in the circumferential direction. In an initial state, the axial first positioning surface 7 and the axial second positioning surface 8 are dislocated in the axial direction, that is, the axial first positioning surface 7 is in front, the axial second positioning surface 8 is behind, the axial first positioning surface 7 and the axial second positioning surface 8 are on the same path of the rotating radius, and are not in the same direction in the circumferential direction, that is, 90 degrees in the circumferential direction.

2. Retracted state of front sleeve

Fig. 10 is a perspective view showing the front sleeve 2 pressed to the bottom in use. As can be seen in fig. 10, the front cannula 2 is retracted relative to the hub 1 to indicate that insulin has been administered to the patient, and the pair of locking grooves 17 (two) are circumferentially offset from the pair of locking posts 12 (two). After the injection is finished, the insulin injection needle is pulled out, and the front sleeve 2 is restored to the initial state under the action of the spring 3.

3. State of sleeve before rotation

Fig. 11 is a perspective view showing a state of the sleeve before rotation, and fig. 12 is a perspective sectional view showing a state of the sleeve before rotation. The arrows in fig. 11 indicate the direction of rotation, and it can be seen from fig. 11 that the position of the pair of locking grooves 17 (two) in the circumferential direction has changed with respect to the pair of locking posts 12 (two), in which the pair of locking posts 12 (two) gradually approaches the pair of locking grooves 17 (two), but has not yet been locked. As can be seen in fig. 12, the forward cannula 2 is disposed in a forward end-limiting position relative to the hub 1. The arrow in fig. 11 indicates the counterclockwise direction of rotation, which is also possible if the front sleeve 2 is rotated clockwise in this embodiment, the same effect as rotating the front sleeve 2 counterclockwise.

4. Locked state of front sleeve

Fig. 13a is a perspective view showing a locked state of the front sleeve, and fig. 13b is a sectional view showing the locked state of the front sleeve. Fig. 13a and 13b show that the locking stud 12 on the front sleeve 2 has engaged the locking groove 17, with the first axial positioning surface 7 being pressed against the second axial positioning surface 8. The axial first positioning surface 7 and the axial second positioning surface 8 are in an axial dislocation state from the previous state, when the front sleeve 2 is rotated, the axial second positioning surface 8 on the front sleeve 2 climbs to be pressed against the axial first positioning surface 7 on the needle seat 1 through the transition surface 9, and meanwhile, the circumferential second positioning surface 11 is in a contact positioning state with the circumferential first positioning surface 10, so that the front sleeve 2 is positioned and locked on the needle seat 1, and safety protection for the needle point at the front end of the needle body 4 is formed. Here, it should be noted that: the axial first positioning surface 7 and the axial second positioning surface 8 are changed into jacking pressure from the previous axial dislocation, the front sleeve 2 and the needle seat 1 are elastically deformed, the elastic deformation also enables the axial first positioning surface 7 and the axial second positioning surface 8 to keep certain jacking pressure, and the jacking pressure theoretically enables the axial first positioning surface 7 and the axial second positioning surface 8 to keep a locking state. But in this example it is better that the locking stud 12 has snapped into the locking groove 17.

Example 2: manually-locked insulin injection needle

As shown in fig. 15-30, consists of a needle holder 1, a needle body 4, a front cannula 2 and a spring 3 (see fig. 15 and 16). This example differs or differs from example 1 in the following way:

firstly, a first step surface 18 (see fig. 19) is arranged on the needle seat 1, the first step surface 18 comprises a front surface and a side surface, the axial first positioning surface 7 is the front surface of the first step surface 18, and the circumferential first positioning surface 10 is the side surface of the first step surface 18 (see fig. 20). The first step 18 corresponds to the locking groove 17 in embodiment 1.

Secondly, a second step surface 19 (see fig. 17) is arranged on the front sleeve 2, the second step surface 19 comprises a front surface and a side surface, the axial second positioning surface 8 is the front surface of the second step surface 19, and the circumferential second positioning surface 11 is the side surface of the second step surface 19 (see fig. 18). The second step surface 19 corresponds to the locking stud 12 in embodiment 1.

Thirdly, the transition surface 9 is an arc surface provided on the side surface of the first step surface 18 and the side surface of the second step surface 19, and the arc surface is an arc angle and is not marked by a reference numeral in the drawing, so that the drawing is not obvious. The circular arc surface in this embodiment corresponds to the slope surface (slope surface on the locking post 12) in embodiment 1.

Fourth, a support plate 20 (see fig. 17) is provided on the front sleeve 2, and the second step surface 19 is provided on the support plate 20. The support piece 20 corresponds to the inner ring in embodiment 1.

Fifthly, the front sleeve 2 is provided with a guiding rib 21 (see fig. 17), and the extension sleeve 15 of the needle holder 1 is provided with a guiding groove 22 and a positioning groove 23 (see fig. 19) corresponding to the guiding rib 21. The guide rib 21 and the guide groove 22 make the front sleeve 2 slide-fit in the axial direction with respect to the needle holder 1. The front sleeve 2 is matched with the needle seat 1 in a circumferential rotation mode at the front end limiting position, and when the front sleeve 2 is rotated clockwise or anticlockwise, the guide rib 21 on the front sleeve 2 slides from the guide groove 22 to the positioning groove 23. The effect of constant head tank 23 is to keep circumferential direction location, and in case the first locating surface 10 of circumference contacts with circumference second locating surface 11, direction muscle 21 also cooperates with constant head tank 23, and the sleeve pipe 2 locks at the relative needle file 1 of axial because of the cooperation of the 8 roof pressure of the first locating surface 7 of axial and axial second locating surface in view of the above, because of the contact of the first locating surface 10 of circumference and circumference second locating surface 11, sleeve pipe 2 locks at the relative needle file 1 of circumference before guide muscle 21 cooperates with constant head tank 23 simultaneously.

Embodiment 2 is basically the same as embodiment 1 in other structures, and a description thereof will not be repeated.

The following describes the use process of embodiment 2 of the present invention with reference to the accompanying drawings:

1. initial state

Fig. 21 is a front view in an initial state, fig. 22 is a cross-sectional view taken along line B-B of fig. 21, fig. 25 is a perspective view in the initial state, and fig. 26 is a partial enlarged view of fig. 25. As can be seen from fig. 22, it can be seen from fig. 8 that the front cannula 2 is in the front end limiting position, the inner edge retainer 16 on the inner edge of the extension sleeve 15 is engaged with the outer edge retainer 14 on the front cannula 2, and the spring 3 presses against the front cannula 2 in the axial direction of the needle holder 1. As can be seen in fig. 25, the guide rib 21 is located in the guide groove 22, not in the positioning groove 23. As can be seen from fig. 26, the first step surface 18 and the second step surface 19 are not joined. In other words, the axial first positioning surface 7 and the axial second positioning surface 8 are on the same path of the radius of rotation, but not in the same orientation in the circumferential direction, the axial first positioning surface 7 is offset from the axial second positioning surface 8 in the axial direction, and the axial first positioning surface 7 is located in front of the axial second positioning surface 8.

2. Retracted state of front sleeve

Fig. 27 is a perspective view showing the front sleeve 2 pressed to the bottom in use, and fig. 28 is a partially enlarged view of fig. 27. As can be seen in fig. 27, the front sleeve 2 is in a retracted state relative to the needle holder 1, indicating that insulin has been injected into the patient, and after the injection is completed, the insulin injection needle is withdrawn and the front sleeve 2 returns to its original state under the action of the spring 3. The guide rib 21 is located in the guide groove 22 and not in the positioning groove 23. As can be seen from fig. 28, the first step surface 18 and the second step surface 19 are not joined. In other words, the axial first positioning surface 7 and the axial second positioning surface 8 are on the same path of the radius of rotation, but not in the same orientation in the circumferential direction, the axial first positioning surface 7 is offset from the axial second positioning surface 8 in the axial direction, and the axial first positioning surface 7 is located in front of the axial second positioning surface 8.

4. Locked state of front sleeve

FIG. 23 is a perspective view showing the front sleeve in a locked state, and FIG. 24 is a cross-sectional view taken in perspective C-C of FIG. 23; fig. 29 is a perspective view from another perspective showing the front sleeve in a locked state, and fig. 30 is an enlarged view of a portion of fig. 29. As can be seen from fig. 24, the axial first positioning surface 7 and the axial second positioning surface 8 are in an axial dislocation state from the previous state, when the front sleeve 2 is rotated, the axial second positioning surface 8 on the front sleeve 2 climbs to the axial first positioning surface 7 on the needle seat 1 through the transition surface 9 to be pressed against, and meanwhile, the circumferential second positioning surface 11 is in a contact positioning state with the circumferential first positioning surface 10, so that the front sleeve 2 is positioned and locked on the needle seat 1, and safety protection for the needle point at the front end of the needle body 4 is formed. As can be seen from fig. 29, the guide rib 21 is located in the positioning groove 23, not in the guide groove 22. As can be seen in fig. 30, the first step surface 18 and the second step surface 19 have been joined. In the locking state, the sleeve 2 is locked in the axial direction relative to the needle seat 1 due to the axial first positioning surface 7 and the axial second positioning surface 8 pressing against the front sleeve. Since the circumferential first positioning surface 10 is in contact with the circumferential second positioning surface 11 and the guiding rib 21 is located in the positioning groove 23, the front cannula 2 is locked in the circumferential direction with respect to the needle hub 1.

Example 3: manually-locked insulin injection needle

As shown in fig. 31 and 32, it is composed of a needle holder 1, a needle body 4 (not shown in fig. 31), a front cannula 2 and a spring 3 (see fig. 31). This example differs or differs from example 1 in the following way: the inner edge of the extension sleeve 15 is provided with a limit post 25, and the outer edge of the front sleeve 2 corresponding to the limit post 25 is provided with a limit groove 24. The circumferential first positioning surface 10 is formed by the side surface of the limiting column 25, and the circumferential second positioning surface 11 is formed by the side surface of the limiting groove 24. When the front sleeve 2 is located at the front end limiting position relative to the needle base 1, the front sleeve 2 is manually rotated, the limiting groove 24 on the front sleeve 2 is matched with the limiting column 25 on the needle base 1, so that the front sleeve 2 is located in the circumferential direction relative to the needle base 1, the axial first locating surface 7 arranged on the needle base 1 in the state is opposite to the axial second locating surface 8 arranged on the front sleeve 2, the front sleeve 2 is located in the axial direction relative to the needle base 1, and the front sleeve 2 is locked relative to the needle base 1.

Embodiment 3 the other structure is substantially the same as embodiment 1, and the description thereof will not be repeated.

Possible variations of the invention with respect to the above-described embodiments are described below:

1. in the above embodiment 1, the manually-locked insulin injection needle is composed of the needle holder 1, the needle body 4, the front cannula 2 and the spring 3 (see fig. 1 and 2). The invention is not limited to the above, and the insulin injection needle as a product can also comprise a jacket which is in a sleeve structure and is sleeved outside the needle base 1 and the front sleeve 2 for protecting the whole insulin injection needle. Since the casing is not related to the point of innovation, it is omitted from both the text and the drawings. In addition, a tail cap may be included to protect the needle hub connection. Since the tail cap is not related to the innovative point of the present invention, it is omitted from the description and drawings. This is also why open language is used in the claims. As can be understood and appreciated by those skilled in the art.

2. In the above embodiment 1, the transition surface 9 is provided for the axial second positioning surface 8 (see fig. 4). However, the invention is not limited to this, and the transition surface 9 may be provided for the axial first positioning surface 7, or the transition surface 9 may be provided for the axial first positioning surface 7 and the axial second positioning surface 8. The transition surface 9 is a guide surface for switching the axial second positioning surface 8 and the axial first positioning surface 7 from the displaced state to the pressed state. It can be seen that the guide surface can be arranged next to the axial first positioning surface 7 and/or the axial second positioning surface 8. As can be understood and appreciated by those skilled in the art.

3. In the above embodiment 1, the locking grooves 17 are provided on the front end face of the positioning column 5 of the needle holder 1, and the locking grooves 17 are two in number and are arranged symmetrically in the circumferential direction (see fig. 6). However, the present invention is not limited to this, and the locking groove 17 need not be provided on the positioning post 5, but may be provided on other portions of the needle holder 1 as long as the axial first positioning surface 7 and the circumferential first positioning surface 10 satisfy the definition requirements of the present invention. In a similar way, the number of the locking grooves 17 is not necessarily two, and theoretically at least one locking groove is needed, but the two locking grooves have symmetry and have better effect. As can be understood and appreciated by those skilled in the art.

4. In the above embodiment 1, the locking stud 12 is seated on the inner ring 13 (see fig. 3), and the locking stud 12 is formed in two and arranged symmetrically in the circumferential direction (see fig. 3). However, the present invention is not limited to this, and the lock cylinder 12 does not necessarily have to be seated on the inner race 13, and the number thereof is not necessarily two, as is the case with the lock groove 17. As can be understood and appreciated by those skilled in the art.

5. In the above embodiment 1, the locking groove 17 (see fig. 6) is provided on the needle holder 1, and the locking column 12 (see fig. 3) is provided on the front sleeve 2. The invention is not limited thereto and the positions of the two can be interchanged, i.e. the locking post 12 is provided on the needle holder 1 and the locking groove 17 is provided on the front cannula 2. The method comprises the following steps: be equipped with locking post 12 on needle file 1, locking post 12 is protruding structure and towards the place ahead, axial first locating surface 7 is the top surface of locking post 12, and circumference first locating surface 10 is the side of locking post 12. Preceding sleeve pipe 2 is last to be equipped with locking groove 17, and locking groove 17 is groove structure and towards the rear, axial second locating surface 8 is the bottom surface of locking groove 17, and circumference second locating surface 11 is the side of locking groove 17. The transition surface 9 is provided on the outside of the locking groove 17 or/and on the side of the locking stud 12. The inner wall of the front sleeve 2 is provided with an inner ring 13 protruding towards the center direction, and the locking groove 17 is arranged on the inner ring 13. The locking column 12 is arranged on the front end face of the positioning column 5 of the needle base 1. As can be understood and appreciated by those skilled in the art.

6. In the above embodiment 1, in order to ensure that the front cannula 2 is in sliding fit with the needle holder 1 in the axial direction, the front cannula 2 is in rotating fit with the needle holder 1 in the circumferential direction. An extension sleeve 15 is arranged on the periphery of the positioning column 5 of the needle holder 1 (see fig. 6 and 8). However, the present invention is not limited to this, that is, the extension sleeve 15 is not necessary to satisfy the moving relationship between the front cannula 2 and the needle holder 1, and may be implemented by directly engaging the front cannula 2 with the outer edge of the hub 6, or by directly engaging the front cannula 2 with the positioning post 5. As can be understood and appreciated by those skilled in the art.

7. In the above embodiment 1, the spring 3 is provided between the front cannula 2 and the needle holder 1. The invention is not limited thereto and it is possible to achieve a reciprocal sliding of the front cannula 2 in the axial direction with respect to the needle holder 1 without the spring 3. As can be understood and appreciated 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 in the protection scope of the present invention.

Claims (10)

1. A manually locked insulin injection needle comprising:

the device comprises a needle base (1), wherein the front part of the needle base (1) is provided with a positioning column (5), and the rear part of the needle base is provided with a connector (6) for connecting an insulin pen;

the front end of the needle body (4) is an injection section, the rear end of the needle body (4) is a connecting section, the needle body (4) is fixed on the positioning column (5), the injection section extends forwards from the front end of the positioning column (5), and the connecting section extends into the interface (6) from the rear end of the positioning column (5);

the front sleeve (2) is used for protecting an injection section of the needle body (4), the main structure of the front sleeve (2) is a tube body, the front sleeve (2) is in axial sliding fit with the needle base (1), the front sleeve (2) has a front end limiting position relative to the needle base (1) in the sliding direction, and the front sleeve (2) is in circumferential rotation fit with the needle base (1) at the front end limiting position;

the method is characterized in that: the needle seat (1) is provided with an axial first positioning surface (7), the axial first positioning surface (7) faces to the axial front, an axial second positioning surface (8) is arranged on the front sleeve (2) corresponding to the axial first positioning surface (7), and the axial second positioning surface (8) faces to the axial rear; the center of the axial first positioning surface (7) and the center of the axial second positioning surface (8) are positioned on the path of the front sleeve (2) relative to the same rotating radius of the needle seat (1);

a circumferential first positioning surface (10) is arranged on the needle seat (1), the circumferential first positioning surface (10) faces towards the circumferential clockwise rotation direction or the circumferential anticlockwise rotation direction, a circumferential second positioning surface (11) is arranged on the front sleeve (2) corresponding to the circumferential first positioning surface (10), and the circumferential second positioning surface (11) faces towards the circumferential anticlockwise rotation direction or the circumferential clockwise rotation direction; the center of the circumferential first positioning surface (10) and the center of the circumferential second positioning surface (11) are positioned on a path of the front sleeve (2) relative to the same rotating radius of the needle seat (1);

in the circumferential direction in the assembled state, the phase difference between the center of the axial first positioning surface (7) and the center of the axial second positioning surface (8) is equal to the phase difference between the center of the circumferential first positioning surface (10) and the center of the circumferential second positioning surface (11);

on preceding sleeve pipe (2) was in front end limit position for needle file (1), manual rotation preceding sleeve pipe (2), when circumference second locating surface (11) on preceding sleeve pipe (2) and circumference first locating surface (10) contact location on the needle file (1), axial second locating surface (8) on preceding sleeve pipe (2) and the face-to-face opposition of axial first locating surface (7) on needle file (1) to this with preceding sleeve pipe (2) positioning lock on needle file (1) and form the safety protection to needle body (4) front end needle point.

2. The insulin injection needle according to claim 1, characterized in that: a transition surface (9) is arranged for the axial first positioning surface (7) or/and the axial second positioning surface (8), the transition surface (9) is an inclined surface or an arc surface, the transition surface (9) is positioned beside the axial first positioning surface (7) or/and the axial second positioning surface (8) and is connected with the axial first positioning surface (7) or/and the axial second positioning surface (8), and the center of the transition surface (9) and the center of the axial first positioning surface (7) or the center of the axial second positioning surface (8) are positioned on a path with the same rotating radius;

when the axial first positioning surface (7) and the axial second positioning surface (8) are in a staggered state in the circumferential direction, the center of the axial first positioning surface (7) and the center of the axial second positioning surface (8) are staggered back and forth in the axial projection position, the staggered length (S1) in the front and back direction falls in the range of the axial projection length (S2) of the transition surface (9), when the front sleeve (2) is manually rotated in the state, the axial second positioning surface (8) on the front sleeve (2) climbs to be in a face-to-face jacking state with the axial first positioning surface (7) on the needle seat (1) through the transition surface (9), and meanwhile, the circumferential second positioning surface (11) is in contact positioning with the circumferential first positioning surface (10).

3. The insulin injection needle according to claim 1, characterized in that: the circumferential first positioning surface (10) is positioned beside the axial first positioning surface (7) and forms an angle with the axial first positioning surface (7), the center of the circumferential first positioning surface (10) and the center of the axial first positioning surface (7) are positioned on a path with the same rotating radius, and the axial projection position of the center of the circumferential first positioning surface (10) is positioned in front of the axial projection position of the center of the axial first positioning surface (7);

the circumferential second positioning surface (11) is located beside the axial second positioning surface (8) and forms an angle with the axial second positioning surface (8), the center of the circumferential second positioning surface (11) and the center of the axial second positioning surface (8) are located on a path with the same rotating radius, and the center of the circumferential second positioning surface (11) is located in front of the axial projection position of the center of the axial second positioning surface (8) at the axial projection position.

4. The insulin injection needle according to claim 1, characterized in that: the needle base (1) is provided with a locking groove (17), the locking groove (17) is of a groove structure and faces the front, the axial first positioning surface (7) is the bottom surface of the locking groove (17), and the circumferential first positioning surface (10) is the side surface of the locking groove (17); the front sleeve (2) is provided with a locking column (12), the locking column (12) is of a convex structure and faces towards the rear, the axial second positioning surface (8) is the top surface of the locking column (12), and the circumferential second positioning surface (11) is the side surface of the locking column (12); the transition surface (9) is arranged on the outer side of the locking groove (17) or/and the side part of the locking column (12).

5. The insulin injection needle according to claim 4, characterized in that: the locking groove (17) is arranged on the end face of the front end of the positioning column (5) of the needle seat (1); an inner ring (13) protruding towards the center direction is arranged on the inner wall of the front sleeve (2), and the locking column (12) is located on the inner ring (13) and faces towards the rear.

6. The insulin injection needle according to claim 1, characterized in that: the needle base (1) is provided with a locking column (12), the locking column (12) is of a convex structure and faces the front, the axial first positioning surface (7) is the top surface of the locking column (12), and the circumferential first positioning surface (10) is the side surface of the locking column (12); the front sleeve (2) is provided with a locking groove (17), the locking groove (17) is of a groove structure and faces towards the rear, the axial second positioning surface (8) is the bottom surface of the locking groove (17), and the circumferential second positioning surface (11) is the side surface of the locking groove (17); the transition surface (9) is arranged on the outer side of the locking groove (17) or/and the side part of the locking column (12).

7. The insulin injection needle according to claim 6, characterized in that: the inner wall of the front sleeve (2) is provided with an inner ring (13) protruding towards the central direction, and the locking groove (17) is arranged on the inner ring (13); the locking column (12) is arranged on the front end face of the positioning column (5) of the needle base (1).

8. The insulin injection needle according to claim 1, characterized in that: an extension sleeve (15) is arranged on the periphery of the positioning column (5), the extension sleeve (15) is of a sleeve structure, and the sleeve and the positioning column (5) are coaxial and are of an integrated structure with the positioning column (5); the front sleeve (2) is in sliding fit with the extension sleeve (15) in the axial direction and is in rotating fit in the circumferential direction.

9. The insulin injection needle according to claim 8, characterized in that: the rear part of the front sleeve (2) is inserted into the extension sleeve (15), the outer edge of the front sleeve (2) is provided with an outer edge retainer ring (14), the inner edge of the extension sleeve (15) is provided with an inner edge retainer ring (16), and when the front sleeve (2) slides forwards relative to the extension sleeve (15), the inner edge retainer ring (16) and the outer edge retainer ring (14) are matched to form the front end limiting position.

10. The insulin injection needle according to claim 1, characterized in that: the needle base (1) is provided with a first step surface (18), the first step surface (18) comprises a front surface and a side surface, the axial first positioning surface (7) is the front surface of the first step surface (18), and the circumferential first positioning surface (10) is the side surface of the first step surface (18); a second step surface (19) is arranged on the front sleeve (2), the second step surface (19) comprises a front surface and a side surface, the axial second positioning surface (8) is the front surface of the second step surface (19), and the circumferential second positioning surface (11) is the side surface of the second step surface (19); the transition surface (9) is arranged on the side surface of the first step surface (18) or/and the side surface of the second step surface (19).

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