CN219375719U - Manual locking insulin syringe needle - Google Patents

Abstract

The utility model provides an insulin syringe needle of manual locking, includes needle file, needle body, preceding sleeve pipe 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 seat, and an axial second positioning surface and a circumferential second positioning surface which are arranged on the front sleeve. When the front sleeve is positioned at the front end limiting position relative to the needle seat, the front sleeve is manually rotated, and the circumferential second positioning surface on the front sleeve is in contact with the circumferential first positioning surface on the needle seat for positioning, the axial second positioning surface on the front sleeve is arranged face to face with the axial first positioning surface on the needle seat, so that the front sleeve is positioned and locked on the needle seat, and the safety protection for the needle point at the front end of the needle body is formed. The technical scheme solves the potential safety hazard problem existing in the existing manual safety protection islet injection needle.

Description

Manual locking insulin syringe needle

Technical Field

The utility model relates to a medical insulin injection tool, in particular to a manually locked insulin injection needle. The injection needle can be matched with an insulin pen for self administration or other administration, wherein the insulin pen can be reused, and the injection needle is a disposable needle. The injection needle has the characteristics that the needle tip is safely protected after being used by manual locking, and the injection needle has the advantages of simple structure, low cost, safety and reliability.

Background

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

The insulin injection tool is various, and the common insulin injection tool is formed by matching an insulin injection needle with an insulin injection pen, 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 head is formed by fixedly connecting a needle body and a needle seat, and has simple structure and low cost, but the needle point is exposed after the use of the unprotected device, so that fingers are easy to be accidentally injured and cross infection is caused. In order to solve the safety problem of the traditional insulin injection needle, a variety of insulin injection needles with safety protection sleeve devices are designed by the skilled person. Such products are generally classified into two main categories, the first category being manual safety protection islet injection needles and the second category being automatic safety protection islet injection needles. Automatic safety protection products often have complex structures and high cost, belong to high-grade medical consumables, are between traditional products and high-grade products, have relatively simple structures and relatively low cost, and belong to safety products popular with consumers.

Chinese patent CN215024119U published a patent entitled "automatic insulin retraction guard needle" in 2021, 12/07, patent application No. 202120554224.2. The patent name is an insulin automatic retraction protective needle, but the manual safety protection type islet injection needle is actually used after the specification is checked, namely, the safety protection can be realized through manual operation. The islet injection needle used as a manual safety protection has the defects of simple structure and relatively low cost, as follows: the protective cap is only dependent on the spring force under the protective needle state and does not enter the locking state, and if the protective cap is pressed or touched, the protective cap can be forced to move to be separated from the protective state, so that the design has potential safety hazards from the viewpoint of safety.

Therefore, how to improve the existing manual safety protection islet injection needle, and the utility model aims to overcome the defect of safety while keeping the advantages of simple structure, low cost and the like.

Disclosure of Invention

The utility model provides a manually locked insulin injection needle, which aims to solve the potential safety hazard problem of the existing manual safety protection islet injection needle.

In order to achieve the above purpose, the utility model adopts the following technical scheme: 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 interface from the rear end of the positioning column.

The front sleeve is used for protecting an injection section of a needle body, the main body 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 that: the needle seat is provided with an axial first positioning surface facing axially forwards, and the front sleeve is provided with an axial second positioning surface corresponding to the axial first positioning surface, and the axial second positioning surface faces axially backwards. The center of the axial first positioning surface and the center of the axial second positioning surface are positioned on the path of the same rotation radius of the front sleeve relative to the needle seat.

The needle seat is provided with a circumferential first positioning surface facing the circumferential clockwise rotation direction or the anticlockwise rotation direction, and the front sleeve is provided with a circumferential second positioning surface corresponding to the circumferential first positioning surface facing 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 the path of the same rotation radius of the front sleeve relative to the needle seat.

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

When the front sleeve is positioned at the front end limiting position relative to the needle seat, the front sleeve is manually rotated, and the circumferential second positioning surface on the front sleeve is in contact with the circumferential first positioning surface on the needle seat for positioning, the axial second positioning surface on the front sleeve is arranged face to face with the axial first positioning surface on the needle seat, so that the front sleeve is positioned and locked on the needle seat, and the safety protection for the needle point at the front end of the needle body is formed.

The relevant content explanation in the technical scheme is as follows:

1. In the above-mentioned scheme, the "front end", "front part", "front direction", "forward", "front" in the preceding "refers to the direction pointed by the needle point of the injection section of the safety insulin injection needle of the present utility model. The "rear" of the "rear", "rear" and "rear" means the opposite direction of the "front".

2. In the above scheme, the insulin injection needle can further comprise a jacket, wherein the jacket is of a sleeve structure and is sleeved outside the needle seat and the front sleeve for protecting the whole insulin injection needle. The jacket is not relevant to innovation points in the utility model, so that the jacket is omitted in the text description and the drawing. The utility model can also comprise a tail cover for protecting the needle body connecting section. The tail cap is not relevant to the innovation point of the utility model, so the tail cap is omitted in the text description and the drawing. This is also why an open expression 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, and the transition surface is positioned beside the axial first positioning surface or/and the axial second positioning surface and is 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 positioned on the same rotating radius path.

When the axial first positioning surface and the axial second positioning surface are in a dislocation state in the circumferential direction, the centers of the axial first positioning surface and the axial second positioning surface are staggered front and back at the axial projection position, the front and back staggered lengths fall in the range of the axial projection length of the transition surface, and in the state, the axial second positioning surface on the front sleeve is lifted to a face-to-face jacking state with the axial first positioning surface on the needle seat through the transition surface when the front sleeve is manually rotated, and meanwhile, the circumferential second positioning surface is in contact positioning with the circumferential first positioning 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 the same rotating radius path, and the projection position of the center of the first circumferential locating surface in the axial direction is located in front of the projection position of the center of the first axial locating surface in the axial direction.

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

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, axial first locating surface is the bottom surface of locking groove, and circumferential first locating surface is the side of locking groove. The front sleeve is provided with a locking column, the locking column is of a protruding structure and faces to the rear, 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 arranged on the front end face 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 to 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, axial first locating surface is the top surface of locking post, and circumferential first locating surface is the side of locking post. The front sleeve is provided with a locking groove which is of a groove structure and faces to the rear, the axial second positioning surface is the bottom surface of the locking groove, and the circumferential second positioning surface is the side surface of the 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 scheme, the inner ring protruding towards the center direction is arranged on the inner wall of the front sleeve, and the locking groove is formed in 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, the periphery of the positioning column is provided with the extension sleeve, the extension sleeve is of a sleeve structure, and the sleeve and the positioning column are coaxial and are of an integrated structure; the front sleeve is in sliding fit with the extension sleeve in the axial direction and is in rotating fit in the circumferential direction.

10. In the above scheme, the rear portion cartridge of preceding sleeve pipe is in extending the cover, be equipped with outer fringe retaining ring on the preceding sleeve pipe outer fringe, be equipped with inner fringe retaining ring on the extension cover inner edge, when the relative extension cover of preceding sleeve pipe slides forward, inner fringe retaining ring cooperates with outer fringe retaining ring and constitutes the front end spacing position.

11. In the above scheme, be equipped with first step face on the needle file, first step face includes front and side, axial first locating surface is the front of first step face, and circumference first locating surface is the side of first step face. 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 conception of the utility model are as follows: in order to solve the potential safety hazard problem of the existing manual safety protection islet injection needle, a rotary positioning locking structure is designed 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. When the front sleeve is positioned at the front end limiting position relative to the needle seat, the front sleeve is manually rotated, and the circumferential second positioning surface on the front sleeve is in contact with the circumferential first positioning surface on the needle seat for positioning, the axial second positioning surface on the front sleeve is arranged face to face with the axial first positioning surface on the needle seat, so that the front sleeve is positioned and locked on the needle seat, and the safety protection for the needle point at the front end of the needle body is formed.

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

1. the structure is simple. Compared with the prior art (compared with the prior art), the utility model has the advantages that no part or die is added, the locking function in the protection state is added through structural improvement, the safety of the insulin injection needle is further improved, and the potential safety hazard in the prior art is eliminated.

2. The conception is ingenious. The utility model designs a simple and reliable rotary positioning locking structure between the needle seat and the front sleeve by utilizing the rotary matching relation between the front sleeve and the needle seat in the front end limiting position state. Thereby skillfully solving the safety problem proposed by the utility model. Although the rotation positioning locking structure is not complex, the utility model has obvious effect and substantial characteristics.

3. The use is more convenient. The utility model can be directly used, and the front sleeve can be locked only by rotating after use. The insulin injection needle in the comparison document can be used after the protective cap is pulled down to rotate and fix, and the protective cap can be separated after the use and the anti-rotation and the fixation are released.

4. The protection is more effective. The utility model can be used to rotate the front sleeve to enter the locking state, thereby forming effective protection. The protective cap is pseudo-protective after the insulin syringe needle in the comparison document is used, and people can still be injured after the insulin syringe needle is touched, so that potential safety hazards exist.

5. With a lock alert tone. When the axial second positioning surface on the front sleeve is climbed to face-to-face jacking with the axial first positioning surface on the needle seat through the transition surface (see embodiment 1), prompt sound can appear to indicate that the locking state is entered. And the insulin injection needle in the reference does not have this effect.

Drawings

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

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

FIG. 3 is a perspective view of the front sleeve of embodiment 1 of the present utility model from the rear end;

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

FIG. 5 is a perspective view of the front sleeve of embodiment 1 of the present utility model from the front end;

fig. 6 is a perspective view of the needle holder according to embodiment 1 of the present utility model;

FIG. 7 is a front view showing the initial state of embodiment 1 of the present utility model;

FIG. 8 is a cross-sectional view A-A of FIG. 7;

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

FIG. 10 is a perspective view showing a state that the front sleeve is pressed to the bottom in embodiment 1 of the present utility model;

FIG. 11 is a perspective view showing the state of the sleeve before rotation in embodiment 1 of the present utility model;

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

FIG. 13a is a perspective view showing a locked state of the front sleeve according to embodiment 1 of the present utility model;

FIG. 13b is a cross-sectional view showing the locked state of the front sleeve according to embodiment 1 of the present utility model;

FIG. 14 is a schematic diagram showing the interleaving of the first axial positioning surface and the second axial positioning surface according to embodiment 1 of the present utility model;

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

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

FIG. 17 is a perspective view of the front sleeve according to embodiment 2 of the present utility model;

fig. 18 is a partial enlarged view of G of fig. 17;

fig. 19 is a perspective view of a needle holder according to embodiment 2 of the present utility model;

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

FIG. 21 is a front view showing the initial state of embodiment 2 of the present utility model;

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

FIG. 23 is a perspective view showing a locked state of the front sleeve according to embodiment 2 of the present utility model;

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

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

FIG. 26 is an enlarged view of a portion of FIG. 25;

FIG. 27 is a perspective view showing a state where the front sleeve is pressed to the bottom in embodiment 2 of the present utility model;

FIG. 28 is an enlarged view of a portion of FIG. 27;

FIG. 29 is a perspective view showing a locked state of a front sleeve according to embodiment 2 of the present utility model

FIG. 30 is an enlarged view of a portion of FIG. 29;

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

fig. 32 is a perspective view of a front sleeve according to embodiment 3 of the present utility model.

In the above figures: 1. a needle stand; 2. a front sleeve; 3. a spring; 4. a needle body; 5. positioning columns; 6. an interface; 7. an axial first positioning surface; 8. an axial second locating surface; 9. a transition surface; 10. a circumferential first locating surface; 11. a circumferential second locating surface; 12. locking the column; 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. a positioning groove; 24. a limit groove; 25. a limit column; s1, staggering the length; s2, projection length.

Detailed Description

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

example 1: manual locking insulin syringe needle

As shown in fig. 1 to 14, the manually locked insulin injection needle consists of a needle holder 1, a needle body 4, a front cannula 2 and a spring 3 (see fig. 1 and 2). Wherein, each spare part and its structure are as follows:

the needle stand 1, the front part of the needle stand 1 is provided with a positioning column 5 (see fig. 6 and 8), and the rear part is provided with an interface 6 (see fig. 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 connecting 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 connecting section extends from the rear end of the positioning column 5 into the connector 6 (see fig. 8).

The front sleeve 2, 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 sliding fit with the needle seat 1 in the axial direction (see fig. 8), the front sleeve 2 has a front end limiting position (see fig. 8) relative to the needle seat 1 in the sliding direction, and the front sleeve 2 is in circumferential rotation fit with the needle seat 1.

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

The innovation of the utility model is that a rotation positioning locking structure is designed between the needle seat 1 and the front sleeve 2. The rotation 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 axially forward. An axial second positioning surface 8 (see fig. 4) is provided on the front sleeve 2 in correspondence with the axial first positioning surface 7, the axial second positioning surface 8 facing axially rearward. The center of the axial first positioning surface 7 and the center of the axial second positioning surface 8 are located on the path of the same rotation radius 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 the circumferential clockwise rotation direction or the anticlockwise rotation direction, and 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 the circumferential anticlockwise rotation direction or the clockwise rotation direction. The center of the circumferential first positioning surface 10 and the center of the circumferential second positioning surface 11 are located on the same rotational radius path of the front cannula 2 relative to the hub 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.

For the axial second positioning surface 8, a transition surface 9 is provided, 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 is 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 the same rotation radius path (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 the same rotation radius path (see fig. 6), and the projection position of the center of the circumferential first positioning surface 10 in the axial direction is located in front of the projection position of the center of the axial first positioning surface 7 in the axial direction.

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

When the front sleeve 2 is at a front end limiting position relative to the needle seat 1 (see fig. 8), and the axial first positioning surface 7 and the axial second positioning surface 8 are in a dislocation 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 at the axial projection position, the front and back staggered length S1 falls within the range of the axial projection length S2 of the transition surface 9 (see fig. 14), and in this state, the axial second positioning surface 8 on the front sleeve 2 is climbed to 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.

In the utility model, the transition surface 9 is a working inclined surface or an arc surface when the front sleeve 2 is locked in a rotating way, because the front sleeve 2 is positioned at a front end limiting position relative to the needle seat 1 before locking, and the axial first positioning surface 7 and the axial second positioning surface 8 are staggered in the front-back axial direction when the axial first positioning surface 7 and the axial second positioning surface 8 are in a staggered state in the circumferential direction, and the axial second positioning surface 8 on the front sleeve 2 climbs up to be propped against the axial first positioning surface 7 on the needle seat 1 through the transition surface 9 when the front sleeve 2 is rotated. The transition surface 9 enables both the axial first positioning surface 7 and the axial second positioning surface 8 to be shifted from the displaced state to the pressing state. In the pressed state the front cannula 2 cannot be retracted back again relative to the hub 1, forcing the front cannula 2 to be in a locked state relative to the hub 1.

In the present embodiment, the axial first positioning surface 7 and the axial second positioning surface 8 are staggered in the axial direction in the unlocked state. That is, it is stated that in the locked state, the axial first positioning surface 7 is rearward and the axial second positioning surface 8 is forward, and the two surfaces are disposed face to face, whereas in the unlocked state, the axial first positioning surface 7 is forward and the axial second positioning surface 8 is rearward, and the two surfaces have a staggered amount, i.e., a staggered length. This staggering is to ensure that in the locked state, the axial first positioning surface 7 and the axial second positioning surface 8 have a pressing force which can ensure the reliability of the locking. The amount of such staggering is generally not too great, otherwise the axial second positioning surface 8 is difficult to climb up to a face-to-face abutment with the axial first positioning surface 7 via the transition surface 9. This is why it is required that the length of the back-and-forth staggering falls within the projected length of the transition surface 9 in the axial direction. However, such back-and-forth interleaving is not essential to the present utility model, and may not be the case.

In this embodiment, the needle holder 1 is provided with a locking groove 17 (see fig. 6), the locking groove 17 is in 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 post 12 (see fig. 3), the locking post 12 is of a convex structure and faces to the rear, the axial second positioning surface 8 is the top surface of the locking post 12, and the circumferential second positioning surface 11 is the side surface of the locking post 12 (see fig. 4). The transition surface 9 is provided on the side of the locking post 12 (see fig. 3 and 4). The locking grooves 17 are provided on the front end face of the positioning post 5 of the needle holder 1 (see fig. 6), and the locking grooves 17 are formed in two and symmetrically arranged 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) protruding toward the center, the locking posts 12 are seated on the inner ring 13 and face rearward (see fig. 3 and 8), and the locking posts 12 are formed in two and symmetrically arranged in the circumferential direction (see fig. 3).

In this embodiment, in order to ensure that the front cannula 2 is axially slidably fitted with the hub 1, the front cannula 2 is in circumferentially rotationally fitted relationship with the hub 1. An extension sleeve 15 (see fig. 6 and 8) is arranged on the periphery of the positioning column 5 of the needle seat 1, and the extension sleeve 15 is of a sleeve structure, and the sleeve is coaxial with the positioning column 5 and is of an integrated structure with the positioning column 5. The front sleeve 2 is axially slidably fitted with the extension sleeve 15 while being circumferentially fitted. The rear part of the front sleeve 2 is inserted into the extension sleeve 15 (see fig. 8), 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 (see fig. 8), 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 description of the use of embodiment 1 of the present utility model is given with reference to the accompanying drawings:

1. initial state

Fig. 7 is a front view showing an initial state, fig. 8 is a sectional view showing an initial state A-A, and fig. 9 is a perspective view showing an initial state. As can be seen from fig. 8, the front sleeve 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 sleeve 2, and the spring 3 is propped against the front sleeve 2 and the needle seat 1 in the axial direction. As can be seen from fig. 9, in the initial state, the pair of locking grooves 17 (two) are offset from the pair of locking posts 12 (two) in the circumferential direction. In the initial state, the axial first positioning surface 7 and the axial second positioning surface 8 are offset in the axial direction, that is, the axial first positioning surface 7 is in front, the axial second positioning surface 8 is in back, the axial first positioning surface 7 and the axial second positioning surface 8 are on the same rotation radius path, and are not in the same direction in the circumferential direction, that is, are 90 degrees in the circumferential direction.

2. Front cannula retracted state

Fig. 10 shows a perspective view of the front sleeve 2 in a bottom-pressed state in use. As can be seen in fig. 10, the front cannula 2 is in a retracted state relative to the hub 1, indicating that insulin has been injected into the patient, while the pair of locking grooves 17 (two) remain offset from the pair of locking posts 12 (two) in circumferential position. After the injection is completed, the insulin injection needle is pulled out, and the front sleeve 2 is restored to the original 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 arrow in fig. 11 indicates the rotational direction, and it can be seen from fig. 11 that the position of the pair of locking grooves 17 (two) in the circumferential direction has been changed with respect to the pair of locking posts 12 (two), wherein the pair of locking posts 12 (two) gradually come close to the pair of locking grooves 17 (two), but have not yet been locked. As can be seen from fig. 12, the front cannula 2 is disposed in a front limit position relative to the hub 1. The arrows in fig. 11 indicate the counterclockwise rotation direction, and in this embodiment it is also possible if the front sleeve 2 is rotated clockwise, the effect being the same as that of the front sleeve 2 rotated counterclockwise.

4. Front cannula locked state

Fig. 13a shows a perspective view of the front cannula locked state, and fig. 13b shows a cross-sectional view of the front cannula locked state. As can be seen from fig. 13a and 13b, the locking stud 12 on the front sleeve 2 has snapped into the locking groove 17, with the axial first positioning surface 7 in a pressed-against state with the axial second positioning surface 8. This also means that the axial first positioning surface 7 and the axial second positioning surface 8 are in the previously axially displaced state, and when the front sleeve 2 is rotated, the axial second positioning surface 8 on the front sleeve 2 rises to a state of pressing against the axial first positioning surface 7 on the needle seat 1 through the transition surface 9, and simultaneously the circumferential second positioning surface 11 is in contact with the circumferential first positioning surface 10, so that the front sleeve 2 is positioned and locked on the needle seat 1, and the safety protection for the tip of the front end of the needle body 4 is formed. What needs to be explained here is: the axial first positioning surface 7 and the axial second positioning surface 8 are thus transformed into a pressing force in the axial direction before the axial displacement, and elastic deformation occurs between the front sleeve 2 and the needle holder 1, and such elastic deformation also maintains a certain pressing force on the axial first positioning surface 7 and the axial second positioning surface 8, and the pressing force can theoretically maintain the locking state of the axial first positioning surface 7 and the axial second positioning surface 8. But in this example the locking post 12 has snapped into the locking groove 17 to lock better.

Example 2: manual locking insulin syringe needle

As shown in fig. 15 to 30, is composed of a needle holder 1, a needle body 4, a front cannula 2 and a spring 3 (see fig. 15 and 16). The present embodiment differs from embodiment 1 in the following differences or differences:

first, the needle seat 1 is provided with a first step surface 18 (see fig. 19), the first step surface 18 includes 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.

Second, the front sleeve 2 is provided with a second step surface 19 (see fig. 17), the second step surface 19 includes 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 post 12 in embodiment 1.

Third, 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 not marked with a reference numeral in the arc angle diagram, so that the illustration is not obvious. The circular arc in this embodiment corresponds to the inclined surface (inclined surface on the lock post 12) in embodiment 1.

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

Fifth, the front sleeve 2 is provided with a guiding rib 21 (see fig. 17), and the extending sleeve 15 of the needle stand 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 enable the front sleeve 2 to axially slide and match with the needle seat 1. At the front end limiting position, the front sleeve 2 is in circumferential rotation fit with the needle seat 1, 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 function of the positioning groove 23 is to maintain the circumferential positioning, once the circumferential first positioning surface 10 is in contact with the circumferential second positioning surface 11, the guide rib 21 is also matched with the positioning groove 23, thereby the sleeve 2 is locked relative to the needle seat 1 in the axial direction before the axial first positioning surface 7 is in pressing fit with the axial second positioning surface 8, and the sleeve 2 is locked relative to the needle seat 1 in the circumferential direction before the guide rib 21 is matched with the positioning groove 23 because the circumferential first positioning surface 10 is in contact with the circumferential second positioning surface 11.

Other structures of embodiment 2 are substantially the same as those of embodiment 1, and a description thereof will not be repeated here.

The following description of the use of embodiment 2 of the present utility model is given with reference to the accompanying drawings:

1. initial state

Fig. 21 is a front view showing an initial state, fig. 22 is a B-B sectional view of fig. 21, fig. 25 is a perspective view showing an initial state, and fig. 26 is a partially enlarged view of fig. 25. As can be seen from fig. 22, as can be seen from fig. 8, the front sleeve 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 sleeve 2, and the spring 3 is pressed against the front sleeve 2 and the axial direction of the needle seat 1. As can be seen in fig. 25, the guide rib 21 is located in the guide groove 22, but not in the positioning groove 23. As can be seen from fig. 26, the first step surface 18 is not bonded to the second step surface 19. In other words, the axial first positioning surface 7 and the axial second positioning surface 8 are on the same path of the rotation radius, but are not in the same orientation in the circumferential direction, the axial first positioning surface 7 is offset from the axial second positioning surface 8, and the axial first positioning surface 7 is located in front of the axial second positioning surface 8.

2. Front cannula retracted state

Fig. 27 is a perspective view showing a state where the front ferrule 2 is pushed down in use, and fig. 28 is a partially enlarged view of fig. 27. As can be seen from fig. 27, the front cannula 2 is in a retracted state relative to the needle mount 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 cannula 2 is restored 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 is not bonded to the second step surface 19. In other words, the axial first positioning surface 7 and the axial second positioning surface 8 are on the same path of the rotation radius, but are not in the same orientation in the circumferential direction, the axial first positioning surface 7 is offset from the axial second positioning surface 8, and the axial first positioning surface 7 is located in front of the axial second positioning surface 8.

4. Front cannula locked state

FIG. 23 is a perspective view showing the front sleeve in a locked state, and FIG. 24 is a perspective cross-sectional C-C view of FIG. 23; fig. 29 shows another perspective view of the front sleeve in a locked condition, and fig. 30 is an enlarged partial view 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 axially offset state before, when the front sleeve 2 is rotated, the axial second positioning surface 8 on the front sleeve 2 is lifted 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 the safety protection for the tip of the front end of the needle body 4 is formed. As can be seen in fig. 29, the guide rib 21 is located in the positioning groove 23, not in the guide groove 22. As can be seen from fig. 30, the first step surface 18 has been joined with the second step surface 19. In the locked state, the front cannula 2 is locked in the axial direction relative to the hub 1 due to the pressing of the axial first positioning surface 7 and the axial second positioning surface 8. Since the circumferential first positioning surface 10 is in contact with the circumferential second positioning surface 11 and the guide rib 21 is located in the positioning groove 23, the front cannula 2 is locked in the circumferential direction with respect to the hub 1.

Example 3: manual locking insulin syringe needle

As shown in fig. 31 and 32, 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). The present embodiment differs from embodiment 1 in the following differences or differences: the inner edge of the extension sleeve 15 is provided with a limit post 25, and a limit groove 24 is arranged on the outer edge of the front sleeve 2 corresponding to the limit post 25. The circumferential first positioning surface 10 is formed by the side surface of the stopper post 25, and the circumferential second positioning surface 11 is formed by the side surface of the stopper groove 24. When the front sleeve 2 is positioned at the front end limiting position relative to the needle seat 1, the front sleeve 2 is manually rotated, and the limiting groove 24 on the front sleeve 2 is matched with the limiting post 25 on the needle seat 1, so that the front sleeve 2 is positioned relative to the needle seat 1 in the circumferential direction, and the axial first positioning surface 7 arranged on the needle seat 1 and the axial second positioning surface 8 arranged on the front sleeve 2 face to face in the state, so that the front sleeve 2 is positioned relative to the needle seat 1 in the axial direction, and the front sleeve 2 is locked relative to the needle seat 1.

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

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

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). However, the utility model is not limited to this, and the insulin injection needle as a product can also comprise an outer sleeve which is in a sleeve structure and is sleeved outside the needle seat 1 and the front sleeve 2 for protecting the whole insulin injection needle. The jacket is omitted from the text and drawings because it is not relevant to the innovation. In addition, a tail cap for protecting the needle connecting section can be included. The tail cap is not relevant to the innovation point of the utility model, so the tail cap is omitted in the text description and the drawing. This is also why an open expression is used in the claims. As will 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 present utility model is not limited to this, and the transition surface 9 may be provided for the first axial positioning surface 7, or the transition surface 9 may be provided for the first axial positioning surface 7 and the second axial 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 dislocated state to the pressing state. It can thus 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 will 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 post 5 of the needle holder 1, and the locking grooves 17 are formed in two and symmetrically arranged in the circumferential direction (see fig. 6). However, the present utility model 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 requirements defined by the present utility model. Similarly, the number of the locking grooves 17 is not necessarily two, but at least one is theoretically enough, but two have symmetry and better effect. As will be understood and appreciated by those skilled in the art.

4. In the above embodiment 1, the locking posts 12 are seated on the inner ring 13 (see fig. 3), and the locking posts 12 are formed in two and symmetrically arranged in the circumferential direction (see fig. 3). However, the present utility model is not limited thereto, and as with the locking groove 17, the locking post 12 does not have to be seated on the inner ring 13, and the number does not have to be two. As will 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 post 12 (see fig. 3) is provided on the front cannula 2. However, the present utility model is not limited thereto, and the positions of the locking post 12 and the locking groove 17 may be exchanged, that is, 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 specifically comprises the following steps: the needle seat 1 is provided with a locking column 12, the locking column 12 is of a convex structure and faces forward, 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 to 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. Said transition surface 9 is provided outside the locking groove 17 or/and on the side of the locking post 12. An inner ring 13 protruding towards the center direction is arranged on the inner wall of the front sleeve 2, 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 seat 1. As will 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 axially slidably fitted with the needle holder 1, the front cannula 2 is circumferentially rotatably fitted with the needle holder 1. An extension sleeve 15 (see fig. 6 and 8) is provided at the periphery of the positioning post 5 of the needle holder 1. However, the present utility model is not limited thereto, that is, it is not necessary to provide the extension sleeve 15 to satisfy the movement relationship between the front cannula 2 and the needle hub 1, and the present utility model may be realized 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 will 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. However, the present utility model is not limited thereto, and the front cannula 2 may be reciprocally slid in the axial direction with respect to the hub 1 without the spring 3. As will be understood and appreciated by those skilled in the art.

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

Claims (10)

1. A manually locked insulin injection needle comprising:

the insulin pen comprises a needle seat (1), wherein a positioning column (5) is arranged at the front part of the needle seat (1), and an interface (6) for connecting an insulin pen is arranged at the rear part of the needle seat;

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 seat (1), the front sleeve (2) is provided with a front end limiting position relative to the needle seat (1) in the sliding direction, and the front sleeve (2) is in circumferential rotation fit with the needle seat (1) at the front end limiting position;

the method is characterized in that: an axial first positioning surface (7) is arranged on the needle seat (1), the axial first positioning surface (7) faces towards the axial front direction, 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 towards the axial rear direction; 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 same rotation radius of the front sleeve (2) relative to the needle seat (1);

The needle seat (1) is provided with a circumferential first positioning surface (10), the circumferential first positioning surface (10) faces to a circumferential clockwise rotation direction or a counterclockwise rotation direction, the circumferential first positioning surface (10) is provided with a circumferential second positioning surface (11) on the front sleeve (2), and the circumferential second positioning surface (11) faces to the circumferential counterclockwise rotation direction or the 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 the path of the same rotation radius of the front sleeve (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);

the front sleeve (2) is positioned at a front end limiting position relative to the needle seat (1), the front sleeve (2) is manually rotated, and when the circumferential second positioning surface (11) on the front sleeve (2) is in contact with the circumferential first positioning surface (10) on the needle seat (1), the axial second positioning surface (8) on the front sleeve (2) is arranged face to face with the axial first positioning surface (7) on the needle seat (1), so that the front sleeve (2) is positioned and locked on the needle seat (1) and the safety protection for the front needle point of the needle body (4) is formed.

2. An 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 the path with the same rotation radius;

when the axial first positioning surface (7) and the axial second positioning surface (8) are in a dislocation state in the circumferential direction, the centers of the axial first positioning surface (7) and the axial second positioning surface (8) are staggered front and back at the axial projection position, the front and back staggered length (S1) falls in the range of the axial projection length (S2) of the transition surface (9), and when the front sleeve (2) is manually rotated in the state, the axial second positioning surface (8) on the front sleeve (2) is lifted to 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. An insulin injection needle according to claim 1, characterized in that: 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 the same rotating radius path, and the projection position of the center of the circumferential first positioning surface (10) in the axial direction is located in front of the projection position of the center of the axial first positioning surface (7) in the axial direction;

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

4. An insulin injection needle according to claim 2, characterized in that: the needle seat (1) is provided with a locking groove (17), the locking groove (17) is of a groove structure and faces forward, 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 to 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. An insulin injection needle according to claim 4, characterized in that: the locking groove (17) is arranged on the front end face 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 to the rear.

6. An insulin injection needle according to claim 2, characterized in that: the needle seat (1) is provided with a locking column (12), the locking column (12) is of a convex structure and faces forward, 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 to 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, wherein: an inner ring (13) protruding towards the center direction is arranged on the inner wall of the front sleeve (2), 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 seat (1).

8. An insulin injection needle according to claim 1, characterized in that: an extension sleeve (15) is arranged at the periphery of the positioning column (5), the extension sleeve (15) is of a sleeve structure, and the sleeve is coaxial with the positioning column (5) and is 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, wherein: the rear part of the front sleeve (2) is inserted into the extension sleeve (15), an outer edge check ring (14) is arranged on the outer edge of the front sleeve (2), an inner edge check ring (16) 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 check ring (16) and the outer edge check ring (14) are matched to form the front end limiting position.

10. An insulin injection needle according to claim 2, characterized in that: the needle seat (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); the front sleeve (2) is provided with a second step surface (19), 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).