CN220572483U

CN220572483U - Automatic injection pen

Info

Publication number: CN220572483U
Application number: CN202321722507.9U
Authority: CN
Inventors: 翁朝敏
Original assignee: Shanghai Fareast International Group Trading Co ltd
Current assignee: Shanghai Fareast International Group Trading Co ltd
Priority date: 2023-07-04
Filing date: 2023-07-04
Publication date: 2024-03-12
Anticipated expiration: 2033-07-04

Abstract

The utility model discloses an automatic injection pen, which comprises an upper pen holder and a lower pen holder which are connected end to end, wherein a thrust structure is arranged in the upper pen holder, a medicine storage control structure connected with the thrust structure is arranged in the lower pen holder, an end cover is arranged at one end, far away from the lower pen holder, of the upper pen holder, and a pen cap is arranged at one end, far away from the upper pen holder, of the lower pen holder; by arranging the injection push rod, the push rod lock catch matched with the injection push rod and the push rod lock catch and the thrust spring, the injection push rod and the push rod lock catch can be reversely buckled and fastened more and more, and the lock catch is prevented from being opened by mistake when the injection push rod and the push rod lock catch are vibrated; the linked needle sleeve push rod, the push rod lock catch and the injection push rod can push the push rod lock catch to realize unlocking of the injection push rod when the needle sleeve push rod presses the injection; through set up rotation slide and reset slide and guide lug, the elasticity card strip that sets up on the needle cover push rod on the needle cover hasp, can make the needle cover push rod reset after the injection, elasticity card strip and needle cover hasp lock joint simultaneously reach the purpose that prevention and cure needle cover push rod is at this back-off, expose the syringe needle.

Description

Automatic injection pen

Technical Field

The utility model relates to an injector, in particular to an automatic injection pen.

Background

At present, the syringe commonly used in medical treatment at home and abroad comprises a needle tube, a core rod, a piston and a needle head, and when the syringe is used, the core rod is required to be continuously pressed manually for injection, and generally, the syringe can only be used for injecting patients by professional medical staff in person. The treatment procedure is complex, time-consuming and labor-consuming, and the patients needing first aid, self-rescue, self-treatment and standby carry and have a plurality of inconveniences. Therefore, some automatic injection pens appear on the market, and the automatic injection pens can meet the requirement of autonomous injection of patients in families, and have the characteristics of simple operation and convenient taking and use, so that the patients needing to inject specific medicaments through the automatic injection pens can inject themselves, and a professional doctor is not required to conduct site guidance, thereby well solving the urgent needs of the patients and protecting the privacy of the patients. However, the existing automatic injection pen has a complex structure, additional unlocking operation is needed, and the needle head cannot be locked after injection, so that other injuries can be caused due to false touch, and the use requirement cannot be met.

Disclosure of Invention

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: an automatic injection pen comprises an upper pen holder and a lower pen holder which are connected end to end, wherein a thrust structure is arranged in the upper pen holder, a medicine storage control structure connected with the thrust structure is arranged in the lower pen holder, an end cover is arranged at one end, far away from the lower pen holder, of the upper pen holder, and a pen cap is arranged at one end, far away from the upper pen holder, of the lower pen holder;

the pushing structure comprises an injection push rod, a push rod lock catch and a pushing spring, and the medicine outlet control structure comprises a pre-filled PFS with a needle, a medicine rack, a needle sleeve spring, a needle sleeve push rod and a needle sleeve lock catch; one end of the injection push rod is locked in the push rod lock catch, the other end of the injection push rod is inserted into the pre-filling PFS with the needle, the push rod lock catch is rotatably arranged at the joint of the end cover and the upper pen holder, and the thrust spring is sleeved on the injection push rod to provide thrust for the injection push rod to move towards the pre-filling PFS with the needle; the needle-bearing pre-filling PFS is arranged in the medicine rack, and the needle sleeve push rod is sleeved outside the medicine rack and is contacted with the push rod lock catch to push the push rod lock catch to rotate from a locking state to an unlocking state; the needle sleeve lock catch is arranged outside the needle sleeve push rod and rotates along with axial displacement of the needle sleeve push rod, and simultaneously, the needle sleeve push rod is converted from an unlocking state to a locking state in the axial direction, and a needle sleeve spring is arranged between the inner end surface of the pre-filled PFS with the needle and the outer end surface of the medicine frame; the lower pen holder and the medicine rack are provided with visual windows corresponding to the pre-filled PFS with the needle; the injection push rod comprises a push rod main body inserted into the pre-filled PFS with the needle and a spring mounting part, and a locking block inserted into a push rod lock catch is arranged at one end of the spring mounting part far away from the push rod main body; the needle sleeve spring is arranged between the spring mounting part and the inner end surface of the upper penholder.

Compared with the prior art, the utility model has the advantages that: according to the scheme, the injection push rod, the push rod lock catch and the thrust spring which are matched with the injection push rod are arranged, so that the injection push rod and the push rod lock catch are reversely buckled and fastened under the action of the pre-pressed thrust spring, and the lock catch is prevented from being opened by mistake when the whole pen is subjected to vibration; through the linked needle sleeve push rod, the push rod lock catch and the injection push rod, the push rod lock catch can be pushed to unlock the injection push rod when the needle sleeve push rod presses the injection, and no additional operation is needed; simultaneously, through setting up on the needle cover hasp and rotating slide and reset slide and the guide lug, the elasticity card strip that set up on the needle cover push rod, can make the needle cover push rod reset after the injection, elasticity card strip and needle cover hasp lock joint simultaneously reach the purpose that prevention and cure needle cover push rod was retracted here, expose the syringe needle, and it is safer to use.

Drawings

Fig. 1 is a schematic view of an automatic injection pen according to the present utility model.

Fig. 2 is a schematic cross-sectional view of an automatic injection pen according to the present utility model.

Fig. 3 is a schematic view of the internal structure of an automatic injection pen according to the present utility model.

Fig. 4 is a schematic diagram showing a split structure of an automatic injection pen according to the present utility model.

Fig. 5 is a schematic diagram of a matching structure of an injection push rod and a push rod lock catch in an automatic injection pen according to the present utility model.

Fig. 6 is a schematic diagram of a matching structure of a push rod lock catch and a needle sleeve push rod in an automatic injection pen according to the present utility model.

FIG. 7 is a schematic view showing the slope engagement of the lock block and the lock base in an automatic injection pen according to the present utility model.

Fig. 8 is a schematic diagram of a matching structure of a needle cover lock catch and a needle cover push rod in an automatic injection pen according to the present utility model.

Fig. 9 is a schematic view showing a locked state of a needle cover lock catch and a needle cover push rod in an automatic injection pen according to the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

In the description of the embodiments of the present utility model, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which the product of the present utility model is conventionally put when used, it is merely for convenience of describing the present utility model and simplifying the description, and it does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang" and the like, if any, do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present utility model, "plurality" means at least 2.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Examples:

with reference to fig. 1-9, this embodiment discloses an automatic injection pen, which comprises an upper pen holder 1 and a lower pen holder 2 which are connected end to end, wherein a thrust structure is arranged in the upper pen holder 1, a medicine storage control structure connected with the thrust structure is arranged in the lower pen holder 2, an end cover 3 is arranged at one end of the upper pen holder 1 away from the lower pen holder 2, and a pen cap 4 is arranged at one end of the lower pen holder 2 away from the upper pen holder 1; the thrust structure comprises an injection push rod 5, a push rod lock catch 6 and a thrust spring 7, and the medicine outlet control structure comprises a pre-filling PFS8 with a needle, a medicine rack 9, a needle sleeve spring 10, a needle sleeve push rod 11 and a needle sleeve lock catch 12; one end of the injection push rod 5 is locked in the push rod lock catch 6, the other end of the injection push rod is inserted into the pre-filling and sealing PFS8 with the needle, the push rod lock catch 6 is rotatably arranged at the joint of the end cover 3 and the upper pen holder 1, and the thrust spring 7 is sleeved on the injection push rod 5 to provide thrust for the injection push rod 5 to move towards the pre-filling and sealing PFS8 with the needle; the pre-filling PFS8 with the needle is arranged in the medicine rack 9, the needle sleeve push rod 11 is sleeved outside the medicine rack 9 and is contacted with the push rod lock catch 6, and the push rod lock catch 6 is pushed to rotate from a locking state to an unlocking state; the needle sleeve lock catch 12 is arranged outside the needle sleeve push rod 11 and rotates along with the axial displacement of the needle sleeve push rod 11, and simultaneously, the needle sleeve push rod 11 is converted from an unlocking state to a locking state in the axial direction, so that an injection needle is locked and prevented from being touched for the second time; wherein, the needle-bearing pre-filling PFS (including a medicine rack) has no rotation function; a needle sleeve spring 10 is arranged between the inner end surface of the pre-filled PFS8 with the needle and the outer end surface of the medicine rack 9; the lower pen holder 2 and the medicine rack 9 are provided with visual windows 13 corresponding to the pre-filled PFS8 with the needle;

the injection push rod 5 comprises a push rod 1102 main body 501 inserted into the pre-filled and sealed PFS8 with a needle and a spring mounting part 502, a locking block 503 inserted into a push rod lock catch 6 is arranged at one end of the spring mounting part 502 far away from the push rod 1102 main body 501, and a thrust spring 7 is arranged between the spring mounting part 502 and the inner end surface of the upper pen holder 1; the center of the push rod lock catch 6 is provided with a moving hole 601 corresponding to the locking block 503, one side of the moving hole 601 is provided with a locking table 602 propped against the locking block 503, when the locking block 503 is positioned on the upper part of the locking table 602, the injection push rod 5 is in a locking state, and when the push rod lock catch 6 rotates to separate the locking block 503 from the locking table 602, the injection push rod 5 is in an unlocking state; meanwhile, the contact surface between the bottom surface of the locking block 503 and the top of the locking table 602 is an engaged inclined surface, the inclined direction of the inclined surface is opposite to the unlocking direction of the injection push rod 5, and when the two inclined surfaces are engaged, the injection push rod 5 is pressed and tightened under the action of the thrust spring 7; when the needle sleeve is normally excited, the push rod lock catch 6 rotates under the action of the external force of the needle sleeve push rod 5 against the pressure generated by the thrust spring 7 on the two inclined planes, so that the push rod lock catch 6 is opened, and the injection push rod 5 starts to work; guide grooves 603 corresponding to the needle sleeve push rod 11 are respectively arranged on two sides of the push rod lock catch 6; the needle sleeve push rod 11 comprises a guide sleeve 1101 arranged in a needle sleeve lock catch 12, push rods 1102 extending to a guide groove 603 are arranged on two sides of the guide sleeve 1101, the joint surface of the push rods 1102 and the guide groove 603 is an inclined surface, and guide convex blocks 1103 corresponding to the needle sleeve lock catch 12 are arranged on two sides of the guide sleeve 1101.

One end of the needle sleeve lock catch 12 is provided with a first abdication groove 1201 corresponding to the rotation range of the push rod 1102, and the other end is provided with a rotation slideway 1202 and a reset slideway 1203 which are in sliding connection with the guide convex block 1103; the rotating slide rail 1202 is an inclined slide rail corresponding to the unlocking direction of the push rod lock catch 6, the reset slide rail 1203 is a transverse slide rail arranged towards the pen cap 4, and the rotating slide rail 1202 and the reset slide rail 1203 are V-shaped; the length of the reset slide way 1203 is longer than that of the rotating slide way 1202, a clamping groove 1204 is formed in the position, located on one side of the reset slide way 1203, of the needle sleeve lock catch 12, the depth of the clamping groove 1204 is longer than that from the end of the reset slide way 1203 to the end of the needle sleeve lock catch 12, an elastic clamping strip 1104 is arranged on the guide sleeve 1101, in an initial state, the elastic clamping strip 11004 covers the needle sleeve lock catch 12, and when a guide projection 1103 on the guide sleeve 1101 slides to the end, close to one end of the pen cap 4, of the reset slide way 1203 along the reset slide way 1203, the elastic clamping strip 1104 is exposed and is buckled with the clamping groove 1204; the medicine rack 9 is fixed in the lower pen holder 2, and two sides of the medicine rack 9 are provided with a second abdication groove corresponding to the rotation range of the push rod 1102.

The pre-filling and sealing PFS8 with the needle comprises a pre-filling and sealing pipe 801 which is inserted with the injection push rod 5, an injection needle 802 is arranged at one end of the pre-filling and sealing pipe 801 close to the pen cap 4, a rubber needle sleeve 803 is sleeved outside the injection needle 802, and the rubber needle sleeve 803 is clamped in the pen cap 4; in the initial state, the injection needle 802 is wrapped in the end of the needle cover push rod 11.

1. Principle of operation of the automatic injection pen:

the thrust structure and the medicine storage control structure of the automatic injection pen are combined into a whole after being filled into the medicine rack through the pre-filling PFS with the needle, so that a complete product with injection medicine is formed; when in injection, the pen cap is pulled down, and the rubber needle sleeve on the needle-carrying prefilled PFS can be carried out together, so that the injection needle is in a waiting working state; the end part of the needle sleeve push rod is aligned with the injection part to be hit or pressed down, at the moment, the injection needle enters the skin of a human body, meanwhile, in the pressing process of the needle sleeve push rod, a guide lug on the needle sleeve push rod moves along a rotating slideway on a needle sleeve lock catch, so that the needle sleeve push rod rotates for a certain angle, the other end of the needle sleeve push rod pushes a push rod lock catch to rotate, a locking table in the push rod lock catch is separated from a locking block of the injection push rod, the injection push rod is unlocked, and the injection push rod pushes a rubber plug with a needle for pre-filling PFS to start injection under the action of a thrust spring; when the push rod lock catch locks the injection push rod, the locking platform has the function that when the injection push rod is reversely buckled and tightened under the action of the pre-pressed thrust spring, the lock catch is prevented from being opened by mistake when the whole pen is subjected to vibration; when the injection needle is pulled out, the needle sleeve push rod rebounds under the action of the needle sleeve spring, at the moment, the guide lug on the needle sleeve push rod moves along the reset slide way on the needle sleeve lock catch, so that the reset position of the needle sleeve push rod exceeds the initial position, and meanwhile, the elastic clamping strip on the needle sleeve push rod is exposed and is buckled with the needle sleeve lock catch, so that the needle sleeve push rod is locked in the axial direction, and the injection needle is prevented from being exposed due to the backspacing of the needle sleeve push rod; in the embodiment, the push rod, the guide groove, the guide protruding block and the elastic clamping strip are all arranged in two and are respectively arranged at two sides of the corresponding structure;

2. parameter calculation of thrust spring

The key component of the automatic injection pen is a thrust spring which can be rapidly activated when needed in a state of being compressed for a long period of time, so that the reliability thereof is required to satisfy R (D ₂ D, n). Gtoreq.0.98, (wherein D ₂ The spring pitch diameter, d is the spring wire diameter, n is the effective number of turns of the spring); in addition, the parameters of the medicine liquid are calculated and determined according to the density, the dosage and the injection speed of the medicine liquid.

Spring thrust force F calculation:

P＝1/2×ρ[Q/(t×1/4×π×d ₂ ² )] ² -1/2×ρ×[Q/(t×1/4×π×d ₁ ² )] ²

wherein P is pressure; density of rho liquid medicine; q, dosage of the liquid medicine; t injection time; d, d ₁ Prefilled inner diameter with needle; d, d ₂ The inner diameter of the injection needle; f thrust pressure, unit: n;

note that: when selecting the F value working point, the spring F can be considered as the average value, namely L in the working stroke ₂ And L is equal to ₁ The force at the midpoint between the two points is used to calculate the L2 point, i.e. the initial thrust of the injection.

The utility model and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the utility model as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.

Claims

1. An automatic injection pen is characterized by comprising an upper pen holder and a lower pen holder which are connected end to end, wherein a thrust structure is arranged in the upper pen holder, a medicine storage control structure connected with the thrust structure is arranged in the lower pen holder, an end cover is arranged at one end, far away from the lower pen holder, of the upper pen holder, and a pen cap is arranged at one end, far away from the upper pen holder, of the lower pen holder;

the pushing structure comprises an injection push rod, a push rod lock catch and a pushing spring, and the medicine storage control structure comprises a pre-filled PFS with a needle, a medicine rack, a needle sleeve spring, a needle sleeve push rod and a needle sleeve lock catch; one end of the injection push rod is locked in the push rod lock catch, the other end of the injection push rod is inserted into the pre-filling PFS with the needle, the push rod lock catch is rotatably arranged at the joint of the end cover and the upper pen holder, and the thrust spring is sleeved on the injection push rod to provide thrust for the injection push rod to move towards the pre-filling PFS with the needle; the needle-bearing pre-filling PFS is arranged in the medicine rack, and the needle sleeve push rod is sleeved outside the medicine rack and is contacted with the push rod lock catch to push the push rod lock catch to rotate from a locking state to an unlocking state; the needle sleeve lock catch is arranged outside the needle sleeve push rod and rotates along with axial displacement of the needle sleeve push rod, and simultaneously, the needle sleeve push rod is converted from an unlocking state to a locking state in the axial direction, and a needle sleeve spring is arranged between the inner end surface of the pre-filled PFS with the needle and the outer end surface of the medicine frame; the lower pen holder and the medicine rack are provided with visual windows corresponding to the pre-filled PFS with the needle.

2. The automatic injection pen according to claim 1, wherein the injection push rod comprises a push rod main body inserted into the pre-filled PFS with needle and a spring mounting part, and a locking block inserted into the push rod lock catch is arranged at one end of the spring mounting part far away from the push rod main body; the needle sleeve spring is arranged between the spring mounting part and the inner end surface of the upper penholder.

3. The automatic injection pen according to claim 2, wherein a moving hole corresponding to the locking block is formed in the center of the push rod lock catch, a locking table which is propped against the locking block is arranged on one side of the moving hole, the injection push rod is in a locking state when the locking block is positioned on the upper part of the locking table, and the injection push rod is in an unlocking state when the push rod lock catch rotates to separate the locking block from the locking table; guide grooves corresponding to the needle sleeve push rods are respectively formed in two sides of the push rod lock catch.

4. An automatic injection pen according to claim 3, wherein the contact surface between the bottom surface of the locking block and the top of the locking table is an inclined surface which is engaged with each other, and the inclined surface is inclined in the opposite direction to the unlocking direction of the injection push rod.

5. An automatic injection pen according to claim 3, wherein the needle sleeve push rod comprises a guide sleeve arranged in the needle sleeve lock catch, push rods extending to the guide groove are arranged on two sides of the guide sleeve, the joint surface of the push rods and the guide groove is an inclined surface, and guide protruding blocks corresponding to the needle sleeve lock catch are arranged on two sides of the guide sleeve.

6. The automatic injection pen according to claim 5, wherein one end of the needle sleeve lock catch is provided with a first abdication groove corresponding to the rotation range of the push rod, and the other end is provided with a rotation slideway and a reset slideway which are in sliding connection with the guide convex block.

7. The automatic injection pen according to claim 6, wherein the rotating slide way is an oblique slide way corresponding to the unlocking direction of the push rod lock catch, the reset slide way is a transverse slide way arranged towards the direction of the pen cap, and the rotating slide way and the reset slide way are in a V shape.

8. The automatic injection pen according to claim 6, wherein the length of the reset slide is greater than that of the rotating slide, a clamping groove is formed in a portion, located on one side of the reset slide, of the needle sleeve lock catch, the depth of the clamping groove is greater than that of the end portion of the reset slide to the end portion of the needle sleeve lock catch, an elastic clamping strip is arranged on the guide sleeve, in an initial state, the elastic clamping strip covers the needle sleeve lock catch, and when the guide protruding block on the guide sleeve slides along the reset slide to the end portion, close to one end of the pen cap, of the reset slide, the elastic clamping strip is exposed and is buckled with the clamping groove.

9. The automatic injection pen according to claim 7, wherein the medicine rack is fixed in the lower pen holder, and two sides of the medicine rack are provided with a second abdication groove corresponding to the rotation range of the push rod.