CN214318782U - Safety insulin pen needle - Google Patents

Abstract

The utility model discloses a safe insulin pen needle, which comprises an inner sheath, wherein the bottom end of the inner sheath is provided with a connecting structure of an insulin pen, a needle seat is arranged in the inner sheath, a limiting part is arranged on the inner sheath, and the needle seat is arranged against the limiting part; the upper part of the injection needle tube is provided with a puncture-proof tube, the bottom end of the puncture-proof tube is provided with a hook ring which exceeds the outer edge of the puncture-proof tube, the top end of the inner sheath is provided with an annular baffle plate of the hook ring, the puncture-proof tube penetrates through the ring of the annular baffle plate, and the annular baffle plate and the inner sheath are integrally arranged; a spring is arranged between the needle seat and the puncture-proof tube; the inner sheath is internally provided with a clamping hook which is sleeved on the spring, and the inner side wall of the middle part of the inner sheath is provided with a clamping hook matched with the bottom end of a clamping part of the clamping hook; after the hook is clamped on the hook ring, the length of the whole formed by the hook and the puncture-proof pipe along the axis of the injection needle pipe is more than or equal to the distance between the top end of the hook and the needle point of the injection needle pipe along the axis direction of the injection needle pipe. The utility model is ingenious in design, and the inner sheath can not be pressed down again after one-time injection.

Description

Safety insulin pen needle

Technical Field

The utility model relates to a safe insulin pen needle.

Background

Insulin injection devices such as insulin pens and injection needles have been widely used as a method for treating diabetes. The main function of the device is to accurately infuse insulin into the body of a diabetic patient through an injection device so as to achieve the purpose of controlling the blood sugar of the patient. Traditional syringe needle includes the protective housing of needle file, needle tubing and outside, removes the protective housing before the use after, and insulin syringe needle directly exposes in the outside, because of its no safety protection structure after the use to it leads to cross infection to take place accident mistake to touch the syringe needle easily. At the same time, due to the unnecessary protective structure, the injection needle can be reused after being used, so that the risk of being reused exists.

In view of this, a safe insulin pen needle for preventing a human from being punctured after use has been developed, and the patent application publication No. CN 104307072 a: the safety insulin pen needle comprises a needle base, a needle tube assembly base arranged on the needle base, an insulin injection needle and an insulin pen puncture needle which are arranged on the needle tube assembly base, a trigger protector arranged outside the needle base and a spring arranged between the trigger protector and the needle base; the side wall of the trigger protector is provided with a guide groove with a specific structure, and the outer edge of the side wall of the needle base is provided with a clamping column corresponding to the guide groove, so that the trigger protector is in a state to be triggered before use and is triggered when used, thereby protecting the injection needle from being exposed outside after use and avoiding cross infection caused by error touch or secondary use; the protective shell and the film or the sealing paper arranged at the opening of the protective shell are further included. But the structure is complex, the installation is not good, and the positioning and locking are not accurate. Patent with publication number CN 203315464U: the utility model provides a safe formula insulin needle, it includes the needle file, be equipped with needle tubing assembly base in the needle file, the upper portion and the lower part of this needle tubing assembly base are equipped with insulin pen pjncture needle and insulin injection needle respectively, the other end of needle file is equipped with the auto-lock seat, the one end of auto-lock seat cup joints with the other end of needle file, be equipped with the pusher in the auto-lock seat, the one end of pusher is located the needle file cavity, and pierce through needle tubing assembly base and be located the assembly portion, the other end of pusher supports the auto-lock piece from auto-lock seat inner chamber inner wall department, the opening from the auto-lock seat other end is in needle sheath one end and connects, the needle sheath other end is unsettled form, the needle sheath passes through the spring and is connected with the needle file inner chamber. The self-locking mechanism can be automatically opened after the insulin pen is screwed into the needle base, and the sheath can freely elastically displace up and down to perform normal insulin injection. The self-locking mechanism can not be self-locked if the insulin pen is forgotten to be taken down after injection, and no indication is provided, so that a patient can not know whether the insulin pen is locked or can inject the insulin pen.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide a safe insulin pen needle, can't push down the inner sheath once more after once injecting, effectively prevent the stab after the use, design benefit, simple structure, installation are easy.

In order to achieve the purpose, the technical scheme of the utility model is to design a safe insulin pen needle, which comprises an inner sheath with openings at two ends, wherein the inner side wall at the bottom end of the inner sheath is provided with a connecting structure of the insulin pen, a needle seat is arranged in the inner sheath, the inner side wall of the inner sheath is integrally provided with a limiting part of the needle seat, and the needle seat is arranged against the limiting part; the injection needle tube is fixedly arranged at the top end of the needle base, the upper part of the injection needle tube is provided with the puncture-proof tube, the bottom end of the puncture-proof tube is integrally provided with a hook ring which exceeds the outer edge of the puncture-proof tube, the hook ring is positioned in the inner sheath, the top end of the inner sheath is provided with an annular baffle plate of the hook ring, the puncture-proof tube penetrates through the ring of the annular baffle plate, the annular baffle plate and the inner sheath are integrally arranged, and the center of the annular baffle plate is provided with an opening matched with the puncture-proof tube; a spring is arranged between the needle seat and the puncture-proof tube, the spring is sleeved on the upper part of the needle seat, one end of the spring is arranged against the bottom end of the needle seat, the other end of the spring is arranged against a clamping hook ring of the puncture-proof tube, and the inner diameter of the puncture-proof tube is larger than the maximum size of the upper part of the needle seat; the needle holder is characterized in that a check sleeve is arranged in the inner sheath, the check sleeve is arranged close to the bottom end of the needle holder, the check sleeve is sleeved on the spring, a hook connecting piece made of elastic material is arranged at the upper part of the check sleeve, hooks are integrally arranged on the hook connecting piece, at least two hooks are arranged, the hooks protrude out of the inner side wall of the hook connecting piece, each hook comprises a guide surface and a clamping surface of a clamping ring, a clamping piece made of elastic material is arranged at the lower part of the check sleeve, the clamping piece is gradually reduced from the bottom end to the top end of the clamping piece, and a clamping hook matched with the bottom end of the clamping piece is arranged on the inner side wall in the middle of the inner sheath; after the hook is clamped on the hook ring, the whole length formed by the non-return sleeve and the puncture-proof pipe is more than or equal to the distance between the top end of the hook and the needle point of the injection needle pipe; the annular baffle is provided with an observation hole of the hook connecting piece. The design is ingenious, simple structure adds the pothook on the basis of general insulin pen needle and sets up the pothook ring with the pothook adaptation on preventing stinging the pipe for pothook card is on preventing stinging the pipe after the injection, because the effect pothook of spring resets with preventing stinging the pipe together again, and the pothook resets again because the pothook that sets up on the inner sheath can play and prevent that the inner sheath is pushed down by external force once more after the injection and the condition that the injection needle tubing stabbed and injures the people appears. Only two or three design changes have obvious effect.

The further technical proposal is that the colors of the non-return jacket, the inner sheath and the puncture-proof pipe are different. Prevent stinging pipe and pothook through the couple joint after the injection like this, again because the effect pothook of spring resets along with preventing stinging the pipe together, the setting of viewing aperture and pothook colour makes the patient know clearly which of the many insulin pen needles that it was equipped with is unused, which is used so that this safe insulin pen needle has the display effect, need not still think that the people knows whether used after pressing preventing the stinging pipe like other insulin pen needles that have self-locking function.

The further technical scheme is that a guide polygonal structure is integrally arranged on the annular baffle, and a guide groove matched with the guide polygonal structure is formed in the inner side wall of the inner sheath. The guiding multi-angle structure ensures that the puncture-proof tube is always kept in a non-rotating state in the processes of pressing down and resetting after injection and injection, and ensures that the bottom end of the clamping hook is clamped on the clamping hook.

The further technical scheme is that the guiding polygonal structure is a hexagonal structure and comprises six guiding bodies in a cuboid shape, and six guiding grooves are formed in the inner side wall of the inner sheath.

The middle part of the non-return sleeve is a circular truncated cone-shaped shell; the hook connecting piece comprises three hook strips; the hook strip and the middle part of the hook are integrally or fixedly arranged; the screens piece is a plurality of and non return cover middle part an organic whole sets up or the fixed elastic sheet that sets up, and the elastic sheet equipartition interval sets up. The hook is in a right-angle triangular prism shape, two parallel planes of the hook are parallel to the side surface of the hook strip, one of the other two perpendicular planes is perpendicular to the hook strip, and the other plane is positioned on the surface of the hook strip; the guide surface is an inclined surface inclined with the hook strip on the right-angle triangular prism-shaped hook, and the size of the hook is gradually increased from the top end to the bottom end; the clamping surface is a plane perpendicular to the clamping hook strip on the right-angle triangular prism-shaped hook. The bottom of pothook promptly screens the piece like this is an elastic part that expands outward, can contract slightly when the pothook is driven by the anti-thorn pipe and resets when it contacts the pothook, then opens again when the pothook leaves the pothook, and the pipe that prevents thorn of pushing down once more just makes the bottom card of screens piece on the pothook like this. The size of the hook gradually increases from the top end to the bottom end, so that the hook strip can be smoothly pushed open outwards in the pressing process of the puncture-proof pipe, and the elastic hook of the hook strip is clamped on the hook ring, so that the hook strip and the hook ring can be smoothly connected. For the convenience of processing and manufacturing, the whole clamping hook can be made of the same material, but the middle part of the clamping hook can be made of a material without elasticity, the upper part and the lower part of the clamping hook are made of elastic materials, and the clamping hook, the upper part and the lower part are fixedly connected to form the whole clamping hook.

The further technical proposal is that the number of the observation ports is consistent with the number of the hook strips, and the positions of the observation ports are also corresponding to the positions of the hook strips; an outer sheath is arranged outside the inner sheath, a plurality of guide bulges are uniformly distributed on the outer side surface of the bottom end of the inner sheath, and grooves matched with the guide bulges are formed in the inner side wall of the bottom end of the outer sheath. The arrangement of the outer sheath can prevent the puncture-proof tube from being connected with the hook when the puncture-proof tube is not injected due to the fact that the puncture-proof tube is pressed down due to external forces such as contact or accidental collision and the like when the puncture-proof tube is not injected, and prevent the injection needle tube from being exposed to hurt people when the puncture-proof tube is not injected.

The further technical proposal is that the connecting structure is an internal thread; the limiting part is of a connecting structure; the needle seat is abutted against the top end of the connecting structure.

The further technical scheme is that the limiting part is a limiting ring integrally arranged on the inner side wall of the inner sheath, and the limiting ring is positioned between the clamping hook and the connecting structure.

The further technical proposal is that the annular baffle is an annular plate; the anti-puncture tube is in a round tube shape, and the opening is a round opening; the upper part of the needle seat is tubular, the upper part of the needle seat is matched with the injection needle tube, and the spring is sleeved on the upper part of the needle seat; the inner diameter of the puncture-proof tube is larger than the outer diameter of the tubular upper end of the needle seat; the inner sheath and the outer sheath are both circular sheaths; the bottom end of the needle base is disc-shaped or circular truncated cone-shaped, the lower bottom surface of the circular truncated cone faces the connecting structure, and the diameter of the bottom surface of the needle base is matched with the bottom diameter of the internal thread; the clamping hook ring is an annular disc or an annular circular truncated cone which is integrally arranged with the puncture-proof pipe, and the upper bottom surface of the annular circular truncated cone is arranged facing the spring. The further technical proposal is that the hook is in a right-angle triangular prism shape, and two planes which are vertical to two parallel planes of the hook are vertical to the axis of the injection needle tube, one plane is parallel to the axis of the injection needle tube, and the size of the hook is gradually reduced from the top end to the bottom end. The size of the hook is gradually reduced from the top end to the bottom end. Therefore, when the hook is reset along with the puncture-proof pipe, the hook can be slightly contracted and then smoothly separated from the hook, the hook is opened after being separated from the hook, and subsequently, if the puncture-proof pipe is pressed down, the bottom end of the hook can be clamped on the end surface of the hook, so that the effect of preventing secondary puncture is achieved. The utility model discloses an action process does: the outer sheath is pulled out, then the inner sheath is connected with the injection pen, normal insulin injection is carried out, when the needle tip protective sleeve (namely the puncture-proof tube) is pressed down, the needle tip protective sleeve (namely the puncture-proof tube) is naturally pressed in, and the needle tip (namely the injection needle tube) is leaked out for injection; after the puncture-proof pipe is used, the needle tip protective sleeve (namely, the puncture-proof pipe) is connected with the clamping hook inside, the clamping hook is clamped on the puncture-proof pipe (particularly, the clamping hook is clamped on the clamping hook ring of the puncture-proof pipe), when the puncture-proof pipe is pressed in again, the puncture-proof pipe cannot be pressed in, and the needle tip is not exposed.

The utility model also provides a safe insulin pen needle, which is characterized in that the safe insulin pen needle comprises an inner sheath with two open ends, the inner side wall of the bottom end of the inner sheath is provided with a connection structure of the insulin pen, a needle seat is arranged in the inner sheath, the inner side wall of the inner sheath is integrally provided with a limit part of the needle seat, and the needle seat is arranged against the limit part; the injection needle tube is fixedly arranged at the top end of the needle seat, the upper part of the injection needle tube is provided with a puncture-proof tube, the bottom end of the puncture-proof tube is provided with a flanging, the bottom end of the puncture-proof tube is integrally provided with a hook extending towards the center of the puncture-proof tube, the top end of the inner sheath is provided with a flanging annular baffle, the puncture-proof tube penetrates through the ring of the annular baffle, the annular baffle and the inner sheath are integrally arranged, a cylindrical shell-shaped clamping hook piece is arranged in the inner sheath, the side surface of the clamping hook piece is integrally provided with a clamping hook matched with the hook, and the clamping hook piece is sleeved on the needle seat and abuts against the bottom end of the needle seat; a spring is arranged between the needle seat and the anti-puncturing tube, the spring is sleeved on the needle seat, one end of the spring is abutted against the bottom end of the needle seat, the other end of the spring is abutted against the flanging of the anti-puncturing tube, and the inner diameter of the anti-puncturing tube is larger than the outer diameter of the clamping hook piece; the inner sheath is internally provided with a non-return sleeve which is fixedly arranged at the top end of the needle seat, the upper end of the non-return sleeve is a horn mouth made of elastic materials, the lower part of the non-return sleeve is a cylindrical shell, the horn mouth is in a tapered shape from the top end to the bottom end, the inner diameter of the clamping hook piece is matched with the outer diameter of the lower part of the non-return sleeve, the maximum outer diameter of the upper end of the non-return sleeve is smaller than the outer diameter of the clamping hook piece, and the outer diameter of the clamping hook piece is smaller than the inner diameter of the spring; the hook is clamped on the clamping hook, and the integral length formed by the clamping hook part and the puncture-proof pipe is more than or equal to the distance between the top end of the bell mouth and the needle tip of the injection needle pipe.

The utility model has the advantages and the beneficial effects that: the utility model relates to an ingenious, can't depress the inner sheath once more after once injecting, prevent effectively that the stabbing after the use from hindering. Design benefit, simple structure adds the pothook on the basis of general insulin pen needle and sets up the pothook ring with the pothook adaptation on preventing stinging the pipe for pothook card resets on preventing stinging the pipe after the injection again because the effect pothook of spring resets with preventing stinging the pipe together, and the pothook resets again because the pothook that sets up on the inner sheath can play and prevent that the inner sheath is pushed down by external force once more after the injection and the condition that the injection needle tubing stabbed and wounded the people appears. Only two or three design changes have obvious effect. Prevent stinging pipe and pothook through the couple joint after the injection, again because the effect pothook of spring resets along with preventing stinging the pipe together, the setting of viewing aperture and pothook colour makes the patient know clearly which of the many insulin pen needles that it was equipped with is unused, which is used so that this safe insulin pen needle has the display effect, need not still think that the people knows whether used after pressing to prevent stinging the pipe like other insulin pen needles that have self-locking function. The guiding multi-angle structure ensures that the puncture-proof tube is always kept in a non-rotating state in the processes of pressing down and resetting after injection and injection, and ensures that the bottom end of the clamping hook is clamped on the clamping hook. The bottom of pothook promptly screens piece is an elastic part that expands outward, can contract slightly when the pothook is driven by the anti-thorn pipe and resets when it contacts the pothook, then opens again when the pothook leaves the pothook, and the pipe that prevents thorn of pushing down once more just makes the bottom card of screens piece on the pothook like this. The size of the hook gradually increases from the top end to the bottom end, so that the hook strip can be smoothly pushed open outwards in the pressing process of the puncture-proof pipe, and the elastic hook of the hook strip is clamped on the hook ring, so that the hook strip and the hook ring can be smoothly connected. The size of the hook is gradually reduced from the top end to the bottom end. Therefore, when the hook is reset along with the puncture-proof pipe, the hook can be slightly contracted and then smoothly separated from the hook, the hook is opened after being separated from the hook, and subsequently, if the puncture-proof pipe is pressed down, the bottom end of the hook can be clamped on the end surface of the hook, so that the effect of preventing secondary puncture is achieved. The arrangement of the outer sheath can prevent the puncture-proof tube from being connected with the hook when the puncture-proof tube is not injected due to the fact that the puncture-proof tube is pressed down due to external forces such as contact or accidental collision and the like when the puncture-proof tube is not injected, and prevent the injection needle tube from being exposed to hurt people when the puncture-proof tube is not injected. The ingenious mechanism design that utilizes realizes that safe insulin pen syringe needle realizes disposable injection, and when injecting once more, the syringe needle is covered by the overcoat, prevents that accidental stabbing from medical personnel or patient.

Drawings

FIG. 1 is an exploded view of a safety insulin pen needle according to the present invention;

FIG. 2 is an enlarged schematic view of the puncture resistant tubing of FIG. 1;

FIG. 3 is an enlarged schematic view of the hook portion of FIG. 1;

FIG. 4 is a schematic view of another perspective of FIG. 2;

FIG. 5 is a schematic view of another perspective of the inner sheath of FIG. 1;

FIG. 6 is a top view of the ring baffle of FIG. 5;

FIG. 7 is a schematic view from another perspective of FIG. 1 assembled;

FIG. 8 is a schematic view of a portion of FIG. 7 taken in section;

FIG. 9 is a schematic view of another perspective of FIG. 8;

FIG. 10 is the view of FIG. 9 with the outer sheath removed;

FIG. 11 is an enlarged schematic view of the inner sheath portion of FIG. 9;

FIG. 12 is a perspective view of the inner sheath;

FIG. 13 is a schematic view of another perspective of FIG. 9;

FIG. 14 is the schematic view of FIG. 13 with the upper half removed;

FIG. 15 is a schematic view from another perspective of FIG. 1;

fig. 16 is an enlarged schematic view of the catch of fig. 15;

fig. 17 is an enlarged schematic view of the hook portion of fig. 16.

In the figure: 1. an inner sheath; 2. a connecting structure; 3. a needle seat; 4. injecting a needle tube; 5. a puncture-proof tube; 6. a snap ring; 7. an annular baffle; 8. an opening; 9. a spring; 10. a hook; 11. a hook connecting piece; 12. hooking; 13. a guide surface; 14. a clamping surface; 15. a clamping piece; 16. a hook; 17. a viewing port; 18. a guide groove; 19. a guide body; 20. an outer sheath; 21. a guide projection; 22. and (4) a groove.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 17, the utility model relates to a safe insulin pen needle, which comprises an inner sheath 1 with openings 8 at two ends, a connecting structure 2 of the insulin pen is arranged on the inner side wall of the bottom end of the inner sheath 1, a needle seat 3 is arranged in the inner sheath 1, a limiting part of the needle seat 3 is integrally arranged on the inner side wall of the inner sheath 1, and the needle seat 3 is arranged against the limiting part; the injection needle tube 4 is fixedly arranged at the top end of the needle seat 3, the puncture-proof tube 5 is arranged at the top end of the injection needle tube 4, the bottom end of the puncture-proof tube 5 is integrally provided with a hook ring 6 which exceeds the outer edge of the puncture-proof tube 5, the hook ring 6 is positioned in the inner sheath 1, the top end of the inner sheath 1 is provided with an annular baffle 7 for clamping the hook ring 6, the annular baffle 7 and the inner sheath 1 are integrally arranged, and the center of the annular baffle 7 is provided with an opening 8 matched with the puncture-proof tube 5; a spring 9 is arranged between the needle stand 3 and the puncture-proof tube 5, the spring 9 is sleeved on the upper part of the needle stand 3, one end of the spring 9 is abutted against the bottom end of the needle stand 3, the other end of the spring 9 is abutted against the hook ring 6 of the puncture-proof tube 5, and the inner diameter of the puncture-proof tube 5 is larger than the maximum size of the upper part of the needle stand 3; the inner sheath 1 is internally provided with a hook 10, the hook 10 is arranged close to the bottom end of the needle base 3, the hook 10 is sleeved on a spring 9, the upper part of the hook 10 is a hook connecting piece 11 made of elastic material, the hook connecting piece 11 is integrally provided with three hooks 12, the hooks 12 are arranged in a protruding manner from the inner side wall of the hook connecting piece 11, each hook 12 comprises a guide surface 13 and a clamping surface 14 of a clamping hook ring 6, the lower part of the hook 10 is a clamping piece 15 made of elastic material, the clamping piece 15 is in a tapered shape from the bottom end to the top end, and the inner side wall of the middle part of the inner sheath 1 is provided with a hook 16 matched with the bottom end of the clamping piece 15; after the hook 12 is clamped on the hook ring 6, the length of the whole formed by the hook 10 and the puncture-proof tube 5 along the axis of the injection needle tube 4 is more than or equal to the distance between the top end of the hook 16 and the needle point of the injection needle tube 4 along the axis direction of the injection needle tube 4. The grab 10 is different from the inner sheath 1 and the puncture-proof pipe 5 in color, the annular baffle 7 is provided with an observation port 17 of the grab connecting piece 11, and the observation port 17 penetrates through the annular baffle 7. The annular baffle 7 is integrally provided with a guiding polygonal structure, and the inner side wall of the inner sheath 1 is provided with a guiding groove 18 matched with the guiding polygonal structure. The guiding polygonal structure is a hexagonal structure and comprises six cuboid-shaped guiding bodies 19, and six guiding grooves 18 are formed in the inner side wall of the inner sheath 1. The middle part of the hook 10 is an annular round table; the hook connecting piece 11 is three hook strips; the hook strip and the middle part of the hook 10 are integrally arranged; the hooks 12 are integrally arranged with the hook strips, and each hook strip is provided with one hook 12; the hook 12 is in a right-angle triangular prism shape, two parallel planes of the hook are parallel to the side surface of the hook strip, and the other two perpendicular planes are vertical to the hook strip and the other plane is positioned on the surface of the hook strip; the guide surface 13 is an inclined surface inclined with the hook strip on the right-angle triangular prism-shaped hook 12, and the size of the hook 12 is gradually increased from the top end to the bottom end; the clamping surface 14 is a plane perpendicular to the hook strip on the right-angle triangular prism-shaped hook 12; the clamping pieces 15 are a plurality of elastic pieces which are integrally arranged with the middle part of the clamping hook 10, and the elastic pieces are uniformly distributed at intervals. The hook 16 is in a right-angle triangular prism shape, two planes perpendicular to two parallel planes of the hook are perpendicular to the axis of the injection needle tube 4, one plane is perpendicular to the axis of the injection needle tube 4, the other plane is parallel to the axis of the injection needle tube 4, and the size of the hook 16 is gradually reduced from the top end to the bottom end. The number of the observation ports 17 is consistent with that of the hook strips, and the positions of the observation ports 17 correspond to those of the hook strips; an outer sheath 20 is arranged outside the inner sheath 1, a plurality of guide protrusions 21 are uniformly distributed on the outer side face of the bottom end of the inner sheath 1, and a groove 22 matched with the guide protrusions 21 is formed in the inner side wall of the bottom end of the outer sheath 20. The annular baffle 7 is an annular plate; the anti-puncture tube 5 is in a circular tube shape, and the opening 8 is a circular opening; the upper part of the needle base 3 is tubular, the upper part of the needle base 3 is matched with the injection needle tube 4, and the spring 9 is sleeved on the upper part of the needle base 3; the inner diameter of the puncture-proof tube 5 is larger than the outer diameter of the tubular upper end of the needle seat 3; the inner sheath 1 and the outer sheath 20 are both circular sheaths; the bottom end of the needle base 3 is in a circular truncated cone shape, the lower bottom surface of the circular truncated cone faces the connecting structure 2, and the diameter of the bottom surface of the needle base 3 is matched with the bottom diameter of the internal thread; the hook ring 6 is an annular circular truncated cone integrally arranged with the stab-resistant pipe 5, and the upper bottom surface of the annular circular truncated cone is arranged facing the spring 9. The connecting structure 2 is an internal thread; the limiting part is a connecting structure 2; the needle seat 3 is abutted against the top end of the connecting structure 2.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. The safe insulin pen needle is characterized by comprising an inner sheath with openings at two ends, wherein a connecting structure of an insulin pen is arranged on the inner side wall of the bottom end of the inner sheath; the injection needle tube is fixedly arranged at the top end of the needle base, the upper part of the injection needle tube is provided with the puncture-proof tube, the bottom end of the puncture-proof tube is integrally provided with a hook ring which exceeds the outer edge of the puncture-proof tube, the hook ring is positioned in the inner sheath, the top end of the inner sheath is provided with an annular baffle plate of the hook ring, the puncture-proof tube penetrates through the ring of the annular baffle plate, the annular baffle plate and the inner sheath are integrally arranged, and the center of the annular baffle plate is provided with an opening matched with the puncture-proof tube; a spring is arranged between the needle seat and the puncture-proof tube, the spring is sleeved on the upper part of the needle seat, one end of the spring is arranged against the bottom end of the needle seat, the other end of the spring is arranged against a clamping hook ring of the puncture-proof tube, and the inner diameter of the puncture-proof tube is larger than the maximum size of the upper part of the needle seat; the needle holder is characterized in that a check sleeve is arranged in the inner sheath, the check sleeve is arranged close to the bottom end of the needle holder, the check sleeve is sleeved on the spring, a hook connecting piece made of elastic material is arranged at the upper part of the check sleeve, hooks are integrally arranged on the hook connecting piece, at least two hooks are arranged, the hooks protrude out of the inner side wall of the hook connecting piece, each hook comprises a guide surface and a clamping surface of a clamping ring, a clamping piece made of elastic material is arranged at the lower part of the check sleeve, the clamping piece is gradually reduced from the bottom end to the top end of the clamping piece, and a clamping hook matched with the bottom end of the clamping piece is arranged on the inner side wall in the middle of the inner sheath; after the hook is clamped on the hook ring, the whole length formed by the non-return sleeve and the puncture-proof pipe is more than or equal to the distance between the top end of the hook and the needle point of the injection needle pipe; the annular baffle is provided with an observation port of the hook connecting piece.

2. The safety insulin pen needle according to claim 1, wherein the color of the check sleeve is different from the color of the inner sheath and the color of the puncture preventing tube.

3. The insulin safety pen needle as claimed in claim 2, wherein the annular baffle is integrally provided with a guiding polygonal structure, and the inner side wall of the inner sheath is provided with a guiding groove adapted to the guiding polygonal structure.

4. The insulin safety pen needle as claimed in claim 3, wherein the guiding polygon structure is a hexagonal structure comprising six guiding bodies in a rectangular parallelepiped shape, and six guiding grooves are provided on the inner side wall of the inner sheath.

5. The insulin safety pen needle as claimed in claim 4, wherein the middle part of the check sleeve is a truncated cone shaped shell; the hook connecting piece comprises three hook strips; the hook strip and the middle part of the hook are integrally or fixedly arranged; the screens piece is a plurality of and non return cover middle part an organic whole sets up or the fixed elastic sheet that sets up, and the elastic sheet equipartition interval sets up.

6. The insulin safety pen needle as claimed in claim 5, wherein the number of the observation ports is the same as the number of the hook strips, and the positions of the observation ports are corresponding to the positions of the hook strips; an outer sheath is arranged outside the inner sheath, a plurality of guide bulges are uniformly distributed on the outer side surface of the bottom end of the inner sheath, and grooves matched with the guide bulges are formed in the inner side wall of the bottom end of the outer sheath.

7. The safety insulin pen needle according to claim 6, wherein the connecting structure is an internal thread; the limiting part is of a connecting structure; the needle seat is abutted against the top end of the connecting structure.

8. The insulin safety pen needle as claimed in claim 6, wherein the position-limiting part is a position-limiting ring integrally arranged on the inner side wall of the inner sheath, and the position-limiting ring is located between the hook and the connecting structure.

9. The safety insulin pen needle according to claim 7 or 8, wherein the annular baffle is a ring-shaped plate; the anti-puncture tube is in a round tube shape, and the opening is a round opening; the upper part of the needle seat is tubular, the upper part of the needle seat is matched with the injection needle tube, and the spring is sleeved on the upper part of the needle seat; the inner diameter of the puncture-proof tube is larger than the outer diameter of the tubular upper end of the needle seat; the inner sheath and the outer sheath are both circular sheaths; the bottom end of the needle base is disc-shaped or circular truncated cone-shaped, the lower bottom surface of the circular truncated cone faces the connecting structure, and the diameter of the bottom surface of the needle base is matched with the bottom diameter of the internal thread; the clamping hook ring is an annular disc or an annular circular truncated cone which is integrally arranged with the puncture-proof pipe, and the upper bottom surface of the annular circular truncated cone is arranged facing the spring.

10. The safe insulin pen needle is characterized by comprising an inner sheath with openings at two ends, wherein a connecting structure of an insulin pen is arranged on the inner side wall of the bottom end of the inner sheath; the injection needle tube is fixedly arranged at the top end of the needle seat, the upper part of the injection needle tube is provided with a puncture-proof tube, the bottom end of the puncture-proof tube is provided with a flanging, the bottom end of the puncture-proof tube is integrally provided with a hook extending towards the center of the puncture-proof tube, the top end of the inner sheath is provided with a flanging annular baffle, the puncture-proof tube penetrates through the ring of the annular baffle, the annular baffle and the inner sheath are integrally arranged, a cylindrical shell-shaped clamping hook piece is arranged in the inner sheath, the side surface of the clamping hook piece is integrally provided with a clamping hook matched with the hook, and the clamping hook piece is sleeved on the needle seat and abuts against the bottom end of the needle seat; a spring is arranged between the needle seat and the anti-puncturing tube, the spring is sleeved on the needle seat, one end of the spring is abutted against the bottom end of the needle seat, the other end of the spring is abutted against the flanging of the anti-puncturing tube, and the inner diameter of the anti-puncturing tube is larger than the outer diameter of the clamping hook piece; the inner sheath is internally provided with a non-return sleeve which is fixedly arranged at the top end of the needle seat, the upper end of the non-return sleeve is a horn mouth made of elastic materials, the lower part of the non-return sleeve is a cylindrical shell, the horn mouth is in a tapered shape from the top end to the bottom end, the inner diameter of the clamping hook piece is matched with the outer diameter of the lower part of the non-return sleeve, the maximum outer diameter of the upper end of the non-return sleeve is smaller than the outer diameter of the clamping hook piece, and the outer diameter of the clamping hook piece is smaller than the inner diameter of the spring; the hook is clamped on the clamping hook, and the integral length formed by the clamping hook part and the puncture-proof pipe is more than or equal to the distance between the top end of the bell mouth and the needle tip of the injection needle pipe.

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