CN108371738B - Safety insulin injection needle - Google Patents

Abstract

A safety insulin injection needle comprising: needle body, needle file, well cover, trigger tube, preceding sleeve and spring, its characterized in that: the elastic arm is arranged on the trigger tube, the boss is arranged on the needle seat, the axial relative motion relationship between the trigger tube and the needle seat is utilized in use, the boss touches the elastic arm and forces the elastic arm to bend outwards to occupy the front position of the spring, so that the trigger tube obtains temporary elastic return capacity between a certain distance of movement by means of the elastic force of the spring, and when the boss is separated from the elastic arm, the elastic return capacity of the trigger tube is automatically relieved. The scheme solves the problem that the tentative elastic rollback capability of the trigger tube cannot be reserved by adopting a single spring structure in the prior art.

Description

Safety insulin injection needle

Technical Field

The invention relates to a medical insulin injection tool, in particular to a safe 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.

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 insulin injection needle is an injection tool matched with an insulin pen, wherein the insulin pen carries a specified amount of insulin liquid medicine and can be repeatedly used, and the injection needle is a disposable needle with a safety protection device.

US2011/0257603a1 discloses an inventive patent application entitled safety pen needle assembly with shield for both patient and non-patient ends. This patent application relates to insulin injection needles, wherein Figs. 2-4 show the safety pen needle assembly of fig. 1 in different states of use. As best seen in Figs. 2-4 of the U.S. patent application, the safety pen needle assembly has two springs, a distal spring for controlling the trigger tube and a proximal spring for controlling the rear cannula. The advantages of the design with a distal spring are: first, the in-process of propelling movement insulin syringe needle, the control trigger tube that can be fine is flexible. For example, when the user pushes a piece of medicine and wants to withdraw the medicine, the trigger tube can be retracted and reset under the action of the distal spring. Second, the distal spring protects the needle tip from exposure by the trigger tube after the trigger tube is touched by mistake during use. However, the two springs used for the insulin injection needle inevitably increase the number of parts of the product, complicate the structure and increase the cost in view of the overall structural design. From the perspective of one of ordinary skill in the art, if one spring is omitted, the number of parts must be reduced, which is beneficial to simplify the structure and reduce the cost. For example, chinese patent CN104771814A discloses an invention patent application named "disposable safety type insulin injection needle", which only uses one spring, but obviously brings about a side effect that the trigger tube loses elastic retraction capability when pushed for a certain distance, and finally the trigger tube does not have a tentative elastic retraction function when the insulin injection needle is used.

Therefore, the invention starts from the aspects of safety, convenience and user experience of the insulin injection needle, and strives to enable the trigger tube to retain the tentative elastic retraction capacity on the premise of adopting a spring.

Disclosure of Invention

In view of the above-identified shortcomings of the prior art, the present invention provides a safety insulin injection needle, which aims to solve the problem that the tentative elastic retraction capability of a trigger tube cannot be reserved by adopting a single spring structure.

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

the needle body has an injection section extending in a front end direction, a connection section extending in a rear end direction, and a fixing section between the injection section and the connection section.

The needle seat is used for fixing the needle body, the fixing section of the needle body is fixed on the needle seat, the injection section of the needle body extends out of the front end of the needle seat, and the connecting section of the needle body extends out of the rear end of the needle seat; the needle seat is at least composed of a seat rod.

The middle sleeve is of a cylinder structure, a through hole is formed in the front end of the middle sleeve, and a structure used for connecting an insulin pen is arranged at the rear end of the middle sleeve.

The trigger tube is used for protecting the injection section of the needle body before use, and the main structure of the trigger tube is a tube body.

The front sleeve is used for protecting an injection section of the used rear needle body, the main structure of the front sleeve is a tube body, and the inner side of the front end of the front sleeve is provided with an inner end face.

A spring for pushing the front cannula to a protected position of the injection section of the needle body.

In the assembled state before use, the needle seat is positioned in the middle sleeve and is positioned relative to the middle sleeve.

Under the assembly state before using, the rear portion of the trigger tube stretches into the middle sleeve and is sleeved on the seat rod of the needle seat, the front portion of the trigger tube stretches out of the through hole at the front end of the middle sleeve and is used for protecting the injection section of the needle body before using, and the trigger tube is provided with a limit position moving forwards relative to the middle sleeve.

In the assembly state before use, the front sleeve is inserted between the middle sleeve and the trigger pipe and is positioned in the middle sleeve; the spring is inserted between the front sleeve and the trigger tube and is positioned in the middle sleeve, the rear end of the spring is oppositely positioned, and the front end of the spring abuts against the inner end face of the front sleeve.

The innovation lies in that: the side part of the needle seat rod is provided with a convex part; a window is arranged on the tube wall of the trigger tube corresponding to the protruding part, and an elastic arm is arranged in the window and is formed by an extending structure of the tube wall of the trigger tube.

The arm end of the elastic arm is suspended in the window, a blocking surface is arranged at the arm end corresponding to the front end of the spring, and a concave part is arranged on the inner side of the elastic arm corresponding to the convex part or a yielding space is arranged beside the elastic arm.

And a notch for the elastic arm to pass through when bending and deforming outwards is arranged on the inner end surface of the front sleeve corresponding to the elastic arm.

In the assembled state before use, the arm end of the elastic arm is positioned in front of the spring in the axial direction, and the notch on the inner end surface of the front sleeve faces to the arm end of the elastic arm in the axial direction.

Under the use state, when the trigger tube moves backwards relative to the needle base in the axial direction, the protruding part on the base rod touches the elastic arm and forces the elastic arm to bend outwards to deform, so that the blocking surface on the arm end of the elastic arm occupies the front position of the front end of the spring, the arm end of the elastic arm penetrates through the notch on the inner end surface of the front sleeve, the blocking surface contacts and compresses the spring to form an elastic retraction state, if the insulin injection needle returns under the elastic retraction state, the trigger tube elastically returns under the action of the spring, if the insulin injection needle continues to be pushed, when the protruding part on the base rod falls into the concave part on the inner side of the elastic arm or the yielding space beside the elastic arm, the elastic arm automatically returns to the inner side, and at the moment, the blocking surface on the arm end of the elastic arm automatically breaks away from the spring and enables the trigger.

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

1. in the present invention, the "front" of the "front end", "forward", "front", and "forward" means the direction pointed by the needle tip of the injection section of the disposable safety insulin injection needle of the present invention. The rear in the terms "rear end", "rearward", "rear" and "rear" means the opposite direction to the front.

2. In the technical scheme, the number of the elastic arms is at least two, and all the elastic arms are uniformly distributed in the circumferential direction of the trigger tube.

3. In the technical scheme, the outer side of the middle sleeve is provided with the outer sleeve which is of a sleeve structure and used for protecting the whole insulin injection needle.

4. In the technical scheme, the needle body connecting section can also comprise a tail cover used for protecting the needle body connecting section.

The design principle and the effect of the invention are as follows: the invention relates to a disposable safe insulin injection needle which is matched with an insulin pen for use. In order to solve the problem that the tentative elastic rollback capability of the trigger tube cannot be reserved by adopting a single spring structure, the technical concept of the invention is as follows:

firstly, aiming at the spring, a window is formed in the pipe wall of the trigger pipe, an elastic arm is arranged in the window, and a blocking surface is arranged at the arm end of the elastic arm corresponding to the front end of the spring and used for blocking the spring.

Secondly, a convex part is arranged on the side part of the needle base seat rod corresponding to the elastic arm and is used for pressing the elastic arm.

Thirdly, a concave part is arranged on the inner side of the elastic arm or a yielding space is arranged beside the elastic arm corresponding to the convex part arranged on the side part of the seat post, so that the elastic arm can elastically return.

Fourthly, a notch is arranged on the inner end face of the front sleeve corresponding to the position of the elastic arm, and the notch can allow the elastic arm to pass through the inner end face of the front sleeve to directly contact with the spring when the elastic arm bends and deforms towards the outside.

When the trigger tube moves axially relative to the needle base in a use state, the convex part arranged on the seat rod is utilized to touch the elastic arm and force the elastic arm to bend and deform outwards, so that the blocking surface on the arm end of the elastic arm occupies the front position of the spring, the arm end of the elastic arm penetrates through the notch on the inner end surface of the front sleeve, the blocking surface is contacted with the spring and compresses the spring to form an elastic retraction state, if the insulin injection needle head is retracted in the elastic retraction state, the trigger tube elastically returns under the action of the spring, if the insulin injection needle head is continuously pushed, when the convex part on the seat rod falls into the concave part on the inner side of the elastic arm or the yielding space beside the elastic arm, the elastic arm automatically returns to the inner side, and at the moment, the blocking surface on the arm end of the elastic arm automatically breaks away from the spring and.

In a word, the invention utilizes the relative motion relation between the trigger tube and the needle seat from the product design angle, and the elastic arm arranged on the trigger tube and the bulge arranged on the needle seat interact with each other, so that the trigger tube obtains temporary elastic return capability by the elastic force of the spring in a certain moving distance, when the bulge is separated from the elastic arm, the elastic return capability of the trigger tube is automatically released, and the problem that the tentative elastic return capability of the trigger tube cannot be reserved by adopting a single spring structure in the prior art is solved. The technical proposal has the advantages of ingenious technical conception, reasonable design scheme, prominent substantive characteristics and obvious technical progress, and fully embodies the safety and the convenience of the use of the injection needle.

Drawings

FIG. 1 is a perspective view of a safety insulin injection needle according to an embodiment of the present invention;

FIG. 2 is an exploded perspective view of a safety insulin injection needle according to an embodiment of the present invention;

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

FIG. 4 is a perspective view of a needle holder in accordance with an embodiment of the present invention;

FIG. 5 is a front view of a needle mount in accordance with an embodiment of the present invention;

FIG. 6 is a top view of a needle mount in accordance with an embodiment of the present invention;

FIG. 7 is a perspective view of a nest in an embodiment of the present invention;

FIG. 8 is a perspective view of an embodiment of the present invention;

FIG. 9 is a perspective view of a front sleeve in accordance with an embodiment of the present invention;

FIG. 10 is a perspective view of a trigger tube according to an embodiment of the present invention;

FIG. 11 is a front view of a trigger tube according to an embodiment of the present invention;

FIG. 12 is a top view of a trigger tube according to an embodiment of the present invention;

FIG. 13 is a right side view of a trigger tube with section marks A-A according to an embodiment of the present invention;

FIG. 14 is a sectional view A-A of FIG. 13;

FIG. 15 is an end view of a safety insulin injection needle with cross-sectional B-B markings according to an embodiment of the present invention;

FIG. 16 is a sectional view taken along line B-B of the embodiment of the present invention prior to use (initial state);

FIG. 17 is a sectional view taken along line B-B of the insulin pen in accordance with the embodiment of the present invention;

FIG. 18 is a B-B cross-sectional view of an embodiment of the present invention with the jacket removed;

FIG. 19 is a B-B cross-sectional view taken prior to insertion into a person's skin in accordance with an embodiment of the present invention;

FIG. 20 is a B-B sectional view showing a state where the insulin needle body is pulled out from the skin after the insulin injection in accordance with the embodiment of the present invention.

In the above drawings:

1. a tail cover; 11. a foot contact hook; 12. a bevel; 13. a stopper; 14. sharp-angled tenons; 15. capping; 16. a front leg; 17. a hole of abdication;

2. a needle seat; 21. a boss portion; 22. a bevel; 23. a seat pan; 24. a seat post; 25. a yielding groove;

3. a middle sleeve; 31. a middle sleeve seat; 32. a card slot; 33. a withdrawal prevention groove;

4. a front sleeve; 41. elastic clamping tenons; 42. a protrusion; 43. an elastic tail wing; 44. an inner end surface; 45. an inclined surface; 46. a notch;

5. a trigger tube; 51. a window; 52. a resilient arm; 53. a blocking surface; 54. a recessed portion; 55. a plug;

6. a needle body;

7. a spring;

8. a jacket; 81. an inner abutting surface.

Detailed Description

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

example 1: safety insulin syringe needle (with front needle protection and back needle protection)

As shown in fig. 1-14, the insulin injection needle consists of a needle body 6, a needle base 2, a middle sleeve 3, a middle sleeve seat 31, an outer sleeve 8, a tail cover 1, a front sleeve 4, a trigger tube 5 and a spring 7 (see fig. 2).

The following describes the structure of the components of the insulin injection needle of this embodiment in sequence:

1. needle body 6

The needle body 6 is a tube needle for injecting insulin, and the needle body 6 has an injection section extending in a front direction, a connection section extending in a rear direction, and a fixing section between the injection section and the connection section.

2. Needle seat 2

The needle base 2 is used for fixing the needle body 6 (see fig. 4, 5 and 6), the fixing section of the needle body 6 is fixed on the needle base 2, the injection section of the needle body 6 extends out from the front end of the needle base 2, and the connecting section of the needle body 6 extends out from the rear end of the needle base 2. The needle seat 2 is composed of a seat disc 23 and a seat rod 24, the seat rod 24 is located at the front end of the seat disc 23 and is fixedly connected with the seat disc 23, two abdicating grooves 25 are formed in the seat disc 23, and a groove is formed in the circumferential direction of the outer edge of the seat disc 23 (see fig. 4, which is not marked).

3. Middle sleeve 3 and middle sleeve seat 31

The middle sleeve 3 and the middle sleeve seat 31 are fixedly assembled into a whole (see fig. 7 and 8), and the whole corresponds to a main shell body of the insulin injection needle tube and is used for accommodating other parts except the outer sleeve 8 (see fig. 16). Well cover 3 is the tubular structure, and the front end of well cover 3 is equipped with the through-hole, and well cover seat 31 is installed in the rear end of well cover 3 for tubular structure, is equipped with the structure that is used for connecting the insulin pen on well cover seat 31. The front part of the inner wall of the cylinder body of the middle sleeve 3 is provided with an anti-retreat groove 33 (see figures 16 and 20). The inner edge of the middle sleeve seat 31 is provided with a clamping groove 32 (see figure 16). The clamping groove 32 is provided with a first positioning position and a second positioning position in the axial direction, and if the rear end face of the middle sleeve seat 31 is used as a reference surface, the distance from the first positioning position to the reference surface is smaller than the distance from the second positioning position to the reference surface. The rear end of the middle sleeve seat 31 is used for connecting an insulin pen, and the connecting structure can adopt a threaded connection mode, a plug-in rotation fastening mode and the like. In this embodiment, the socket 31 is shown as a threaded connection in fig. 16.

4. Outer cover 8

The sheath 8 serves to protect the insulin injection needle as a whole (see fig. 16). The outer sheath 8 is of a sleeve structure, and an inner abutting surface 81 is arranged on the inner side of the front end of the outer sheath 8.

5. Tail cover 1

The tail cap 1 is used for protecting the connecting section of the needle body 6 after the insulin injection needle is used. The tail cover 1 is composed of a cover cap 15 and two front legs 16, the cover cap 15 is an end cover or an annular body, the center of the cover cap 15 is provided with a pin hole 17 only for the insertion of the connecting section of the needle body 6, the axis of the pin hole 17 is parallel to the axis of the main shell 3, the two front legs 16 are fixedly connected to the front end of the cover cap 15, and the pin hole 17 is symmetrically arranged by taking the axis of the pin hole 17 as a reference, the inner side of each front leg 16 is provided with an inclined plane 12 at the root position, the middle position is provided with a stop 13 extending inwards, and the tail end position is provided with a foot contact hook. The outer side of each front leg 16 is provided with a pointed rebate 14 at a central location.

6. Front sleeve 4

The front cannula 4 serves to protect the injection site of the needle 6 after use (see fig. 20). The main structure of the front sleeve 4 is a tube body, and an inner end surface 44 is arranged on the inner side of the front end of the front sleeve 4. The rear end of the front sleeve 4 is provided with a backward extending elastic tenon 41 and a backward extending elastic tail 43, and the elastic tenon 41 and the elastic tail 43 are arranged in a staggered way in the circumferential direction of the front sleeve 4. The middle outer side of the front sleeve 4 is provided with a bulge 42 extending outwards, the bulge 42 corresponds to the elastic clamping tenon 41 in the circumferential position of the front sleeve 4, and one side of the bulge 42 close to the elastic clamping tenon 41 is provided with an inclined surface 45.

7. Trigger tube 5

The trigger tube 5 serves to protect the injection site of the needle body 6 prior to use (see fig. 16). The main body structure of the trigger tube 5 is a tube body, two plugs 55 extending backwards are arranged at the rear end of the trigger tube 5, and barbs are arranged on the plugs 55.

8. Spring 7

Said spring 7 is used to push the front cannula 4 to the protecting position of the injection section of the needle 6 and the tail cap 1 to the protecting position of the connection section of the needle 6.

The connection and positional relationship of the above parts in the assembled state before use are described below:

1. under the assembly state before using, overcoat 8 suit is in the middle cover 3 outside for protect insulin syringe needle is whole, the front end of trigger tube 5 supports and leans on the interior support surface 81 of overcoat 8.

2. In the assembled state before use, the needle seat 2 is positioned in the middle sleeve 3, the seat disc 23 of the needle seat 2 is in sliding positioning fit in the middle sleeve 31 along the axial direction, the middle sleeve seat 31 has a first positioning position and a second positioning position relative to the seat disc 23 in the sliding direction, and the seat disc 23 is positioned at the first positioning position of the middle sleeve seat 31 before use.

3. Under the assembly state before using, the rear portion of trigger tube 5 stretches into well cover 3 to the suit is on the seat pole 24 of needle file 2, and the front portion of trigger tube 5 stretches out from the through-hole of well cover 3 front end for the injection section of needle body 6 before the protection uses, and trigger tube 5 is equipped with the spacing of forward motion relative to well cover 3.

4. In the assembled state before use, the front sleeve 4 is inserted between the middle sleeve 3 and the trigger tube 5 and is positioned in the middle sleeve 3. The spring 7 is inserted between the front sleeve 4 and the trigger tube 5 and is positioned in the middle sleeve 3, the rear end of the spring 7 is relatively positioned, and the front end of the spring 7 abuts against the inner end surface 44 of the front sleeve 4;

the structural features required to solve the technical problem of the present invention (i.e. the problem of not retaining the tentative elastic retraction capability of the trigger tube with a single spring structure.) are described below:

1. a convex part 21 is arranged at the side part of the seat rod 24 of the needle seat 2, and a bevel 22 is arranged on the convex part 21 (see figures 4 and 5).

2. A window 51 is opened on the tube wall of the trigger tube 5 corresponding to the protruding part 21, an elastic arm 52 is arranged in the window 51, and the elastic arm 52 is formed by an extending structure of the tube wall of the trigger tube 5 (see fig. 10). The number of the elastic arms 52 is two, and the two elastic arms 52 are uniformly distributed in the circumferential direction of the trigger tube 5.

3. The end of the spring arm 52 is suspended in the window 51, and a stop surface 53 (see fig. 10) is provided on the end of the arm corresponding to the front end of the spring 7, and a recess 54 (see fig. 16, 17 and 18) is provided inside the spring arm 52 corresponding to the projection 21.

4. Notches 46 are provided on the inner end surface 44 of the front sleeve 4 at positions corresponding to the resilient arms 52 for the resilient arms 52 to pass through when they are deformed by bending toward the outside (see fig. 18, 19 and 20).

The connection and positional relationships of the necessary structural and technical features in the assembled state before use are described below:

in the pre-use assembled state, the spring 7 is positioned outside the outer edge of the trigger tube 5, the arm end of the elastic arm 52 is positioned inside the outer edge of the trigger tube 5, the arm end of the elastic arm 52 is positioned in front of the spring 7 in the axial direction, the notch 46 on the inner end surface 44 of the front sleeve 4 is positioned in the axial direction towards the arm end of the elastic arm 52, and the protruding part 21 on the seat post 24 is positioned behind the arm end of the elastic arm 52 in the axial direction.

The following describes the use process of the embodiment:

1. initial state

Fig. 16 shows an initial state before use of the embodiment of the present invention. As can be seen in fig. 16, in this state the resilient arms 52 on the trigger tube 5 are in a natural state, with the ramp 22 of the boss 21 on the needle hub 2 adjacent the arm ends of the resilient arms 52.

2. Screw-in insulin pen state

FIG. 17 shows the embodiment of the present invention in a screw-in insulin pen state. As can be seen from fig. 17, in this state, when the insulin pen is slowly screwed into the middle sleeve holder 31, the tail cap 1 and the seat disk 23 on the needle seat 2 are pushed to move forward in the middle sleeve holder 31 from the first locating position to the second locating position. As the needle holder 2 moves forward in the middle sleeve 3 (the trigger tube 5 is limited to be relatively stationary by the inner abutting surface 81 of the outer sleeve 8), the convex part 21 on the seat rod 24 touches the elastic arm 52 and forces the elastic arm 52 to bend and deform outwards, so that the stop surface 53 on the arm end of the elastic arm 52 takes the front position of the front end of the spring 7.

3. State of removing the jacket

FIG. 18 shows an example of the present invention with the jacket removed. As can be seen in figure 18, the sheath has been removed and in this condition when the trigger tube 5 has reached the injection site, the trigger tube 5 is moved rearwardly relative to the front sleeve 4 and the resilient arms 52 have passed the notches 46 in the inner end surface 44 of the front sleeve 4 and are brought into resilient retraction by the abutment surfaces 53 contacting and compressing the spring 7. In the elastic retraction state, if the insulin injection needle is retracted, the trigger tube 5 is elastically returned under the action of the spring 7.

4. State before penetrating into human skin

FIG. 19 shows a condition of the present invention before it penetrates the skin of a human body. As can be seen from FIG. 19, if the insulin injection needle is pushed further, the spring arm 52 will automatically return to the inner side when the protrusion 21 of the seat post 24 falls into the recess 54 of the inner side of the spring arm 52, and the stop surface 53 at the end of the spring arm 52 will automatically disengage from the spring 7 and the trigger tube 5 will automatically release the elastic return capability.

5. After the insulin injection is finished, the insulin needle body is pulled out of the skin

FIG. 20 shows the state after the insulin injection needle body is pulled out from the skin according to the embodiment of the present invention. As can be seen in fig. 20, in this state the trigger tube 5 is retracted into the middle sleeve 3, while the front sleeve 4 is pushed by the spring 7 in a front protecting position for protecting the injection section of the needle 6.

Example 2: safety insulin syringe needle (with front needle protection and without back needle protection)

The insulin injection needle consists of a needle body 6, a needle base 2, a middle sleeve 3, a middle sleeve seat 31, an outer sleeve 8, a front sleeve 4, a trigger tube 5 and a spring 7.

Example 2 differs from example 1 in that: the tail cover 1 is cancelled, and the needle tip protection structure is only arranged at the front end and is not arranged at the rear end. The others are substantially the same as those in embodiment 1, and the description thereof will not be repeated.

The contents and variations of the above examples are explained below:

1. in the above two embodiments, the middle sleeve 3 and the middle sleeve seat 31 are in a split structure, and then are integrated by sleeving and combining, and such design is for the consideration of processing manufacturability. From the structural and constructional point of view, the middle sleeve 3 and the middle sleeve seat 31 can be designed as a one-piece structure without affecting the technical effect of the present invention, as will be understood by those skilled in the art.

2. In the above two embodiments, in order to make the elastic arm 52 automatically return to the inner side at a proper time after being bent and deformed to the outer side, the concave portion 54 is designed on the inner side of the elastic arm 52 corresponding to the convex portion 21 on the seat post 24, and during the backward movement of the trigger tube 5, when the convex portion 21 on the seat post 24 falls into the concave portion 54 on the inner side of the elastic arm 52, the elastic arm 52 automatically returns to the inner side, and at this time, the stop surface 53 on the arm end of the elastic arm 52 automatically disengages from the spring 7 and makes the trigger tube 5 automatically release the elastic return capability. In the context of the present invention, the provision of the recess 54 inside the elastic arm 52 in correspondence with the projection 21 can be modified to provide a relief space beside the elastic arm 52, also for the purpose of the invention, achieving the same technical result, as a variation which will be appreciated by the person skilled in the art.

3. In the above two embodiments, the number of the elastic arms 52 is two, but the present invention is not limited thereto, and the number of the elastic arms 52 may be three, four, five, or even more, and all the elastic arms 52 are uniformly distributed in the circumferential direction of the trigger tube 5. This is a variation as would be appreciated by those skilled in the art.

4. In the above two embodiments, when the insulin pen is slowly screwed into the middle sleeve seat 31, the tail cap 1 and the seat disk 23 on the needle seat 2 are pushed to move forward in the middle sleeve seat 31 from the first locating position to the second locating position. That is, during the screwing-in process of the insulin pen, the seat rod 24 of the needle seat 2 is pushed to move forward by the action of the screwing-in insulin pen, and the convex part 21 on the seat rod 24 touches the elastic arm 52 and forces the elastic arm 52 to bend and deform outwards, so that the stop surface 53 on the arm end of the elastic arm 52 occupies the front position of the front end of the spring 7. Such an axial movement of the needle holder 2 with respect to the middle sleeve 3 and the middle sleeve holder 31 is not necessary, as long as the boss 21 is in place with respect to the front end of the spring 7, directly moving the trigger tube 5 backwards, the boss 21 can also touch the resilient arms 52 and force the resilient arms 52 to flex outwards. It is therefore not essential to the invention that the needle holder 2 has the first and second positioning positions in the axial direction with respect to the middle sleeve 3 and the middle sleeve holder 31.

5. The embodiment of the invention mainly describes the structure and the connection relation of a safe insulin injection needle head, which are used for solving the problem that the tentative elastic retraction capability of a trigger tube cannot be reserved by adopting a single spring structure. Other structures and connection relations of the safety insulin injection needle of the present invention can be referred to the disclosure of the Chinese patent CN104771814A described in the background.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (6)

1. A safety insulin injection needle comprising:

the needle body (6), the needle body (6) has an injection section extending towards the front end direction, a connecting section extending towards the back end direction and a fixing section positioned between the injection section and the connecting section;

the needle base (2) is used for fixing the needle body (6), the fixing section of the needle body (6) is fixed on the needle base (2), the injection section of the needle body (6) extends out of the front end of the needle base (2), and the connecting section of the needle body (6) extends out of the rear end of the needle base (2); the needle seat (2) at least consists of a seat rod (24);

the middle sleeve (3) is of a cylinder structure, the front end of the middle sleeve (3) is provided with a through hole, and the rear end of the middle sleeve (3) is provided with a structure for connecting an insulin pen;

the trigger tube (5), the trigger tube (5) is used for protecting the injection section of the needle body (6) before use, the main structure of the trigger tube (5) is a tube body;

the front sleeve (4), the front sleeve (4) is used for protecting the injection section using the rear needle body (6), the main structure of the front sleeve (4) is a tube body, and the inner side of the front end of the front sleeve (4) is provided with an inner end surface (44);

a spring (7), wherein the spring (7) is at least used for pushing the front cannula (4) to a protection position of the injection section of the needle body (6);

in the assembly state before use, the needle base (2) is positioned in the middle sleeve (3) and is positioned relative to the middle sleeve (3);

in an assembly state before use, the rear part of the trigger tube (5) extends into the middle sleeve (3) and is sleeved on a seat rod (24) of the needle seat (2), the front part of the trigger tube (5) extends out of a through hole at the front end of the middle sleeve (3) and is used for protecting an injection section of the needle body (6) before use, and the trigger tube (5) is provided with a limit position moving forwards relative to the middle sleeve (3);

in an assembly state before use, the front sleeve (4) is inserted between the middle sleeve (3) and the trigger pipe (5) and is positioned in the middle sleeve (3); the spring (7) is inserted between the front sleeve (4) and the trigger tube (5) and is positioned in the middle sleeve (3), the rear end of the spring (7) is oppositely positioned, and the front end of the spring (7) abuts against the inner end surface (44) of the front sleeve (4);

the method is characterized in that: a convex part (21) is arranged at the side part of a seat rod (24) of the needle seat (2); a window (51) is arranged on the pipe wall of the trigger pipe (5) corresponding to the protruding part (21), an elastic arm (52) is arranged in the window (51), and the elastic arm (52) is formed by an extending structure of the pipe wall of the trigger pipe (5);

the arm end of the elastic arm (52) is suspended in the window (51), a blocking surface (53) is arranged at the front end of the arm end corresponding to the spring (7), a concave part (54) is arranged at the inner side of the elastic arm (52) corresponding to the convex part (21) or a yielding space is arranged beside the elastic arm (52);

a notch (46) for the elastic arm (52) to pass through when bending and deforming outwards is arranged on the inner end surface (44) of the front sleeve (4) corresponding to the elastic arm (52);

in the assembled state before use, the arm end of the elastic arm (52) is positioned in front of the spring (7) in the axial direction, and the notch (46) on the inner end surface (44) of the front sleeve (4) faces to the direction of the arm end of the elastic arm (52) in the axial direction;

in the using state, when the trigger tube (5) moves axially backwards relative to the needle base (2), the convex part (21) on the seat rod (24) touches the elastic arm (52) and forces the elastic arm (52) to bend and deform outwards, so that the blocking surface (53) on the arm end of the elastic arm (52) occupies the front position of the front end of the spring (7), the arm end of the elastic arm (52) passes through the notch (46) on the inner end surface (44) of the front sleeve (4), the blocking surface (53) contacts and compresses the spring (7) to form an elastic retraction state, if the insulin injection needle is retracted in the elastic retraction state, the trigger tube (5) elastically returns under the action of the spring (7), if the insulin injection needle is pushed continuously, when the convex part (21) on the seat rod (24) falls into the concave part (54) on the inner side of the elastic arm (52) or a yielding space beside the elastic arm (52), the elastic arm (52) automatically returns to the inner side, and at the moment, the stop surface (53) on the arm end of the elastic arm (52) automatically disengages from the spring (7) and enables the trigger tube (5) to automatically release the elastic return capability.

2. The safety insulin injection needle according to claim 1, characterized in that: the number of the elastic arms (52) is at least two, and all the elastic arms (52) are uniformly distributed in the circumferential direction of the trigger tube (5).

3. The safety insulin injection needle according to claim 1, characterized in that: an outer sleeve (8) is arranged on the outer side of the middle sleeve (3), the outer sleeve (8) is of a sleeve structure, and an inner abutting surface (81) is arranged on the inner side of the front end of the outer sleeve (8); under the assembly state before using, overcoat (8) suit is in well cover (3) outside for protect insulin syringe needle is whole, the front end of trigger tube (5) is supported and is leaned on interior support face (81) of overcoat (8).

4. The safety insulin injection needle according to claim 1, characterized in that: two plugs (55) extending backwards are arranged at the rear ends of the trigger tubes (5), and barbs are arranged on the plugs (55).

5. The safety insulin injection needle according to claim 1, characterized in that: the rear end of the front sleeve (4) is provided with an elastic clamping tenon (41) extending backwards and an elastic tail wing (43) extending backwards, and the elastic clamping tenon (41) and the elastic tail wing (43) are arranged in a staggered manner in the circumferential direction of the front sleeve (4); the middle outer side of the front sleeve (4) is provided with a bulge (42) extending outwards, the bulge (42) corresponds to the elastic clamping tenon (41) in the circumferential direction of the front sleeve (4), and one side of the bulge (42) close to the elastic clamping tenon (41) is provided with an inclined surface (45).

6. The safety insulin injection needle according to claim 1, characterized in that: the needle protection device comprises a tail cover (1) for protecting a needle body (6) connecting section, wherein the tail cover (1) consists of a cover cap (15) and two front legs (16), the cover cap (15) is an end cover or an annular body, the center of the cover cap (15) is provided with a pin hole (17) only for the needle body (6) connecting section to penetrate, the axis of the pin hole (17) is parallel to the axis of a middle sleeve (3), the two front legs (16) are fixedly connected to the cover cap (15) and are symmetrically arranged by taking the axis of the pin hole (17) as a reference, the inner side of each front leg (16) is provided with an inclined plane (12) at the root position, the middle position is provided with a stop block (13) extending inwards, and the tail end position is provided with a foot contact hook (11); the outer side of each front leg (16) is provided with a sharp-angled tenon (14) at the middle position.

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