WO2023185602A1 - 自动注射笔 - Google Patents

自动注射笔 Download PDF

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Publication number
WO2023185602A1
WO2023185602A1 PCT/CN2023/083222 CN2023083222W WO2023185602A1 WO 2023185602 A1 WO2023185602 A1 WO 2023185602A1 CN 2023083222 W CN2023083222 W CN 2023083222W WO 2023185602 A1 WO2023185602 A1 WO 2023185602A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
piston
excitation
locking
claw
Prior art date
Application number
PCT/CN2023/083222
Other languages
English (en)
French (fr)
Inventor
林霄
邹红霞
胡光军
Original Assignee
苏州赛卫生物科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 苏州赛卫生物科技有限公司 filed Critical 苏州赛卫生物科技有限公司
Publication of WO2023185602A1 publication Critical patent/WO2023185602A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M2005/2006—Having specific accessories
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M2005/2026—Semi-automatic, e.g. user activated piston is assisted by additional source of energy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3223—Means impeding or disabling repositioning of used needles at the syringe nozzle

Definitions

  • the invention relates to an automatic injection pen and belongs to the field of medical injection instruments.
  • the applicant has previously applied for and disclosed an automatic injection pen with the Chinese patent publication number CN113499513A. It adopts an automatic injection device and spring linkage to realize a single pressing operation of holding the main body of the pen tube to complete a complete set of needle insertion, injection and needle retracting actions.
  • the disposable syringe contained in it is pushed out, medicine is pushed, and the needle is withdrawn and hidden, which reduces the operator's operating movements and achieves reliable medicine injection.
  • the excitation mechanism lacks a locking structure, resulting in the risk of accidental release during transportation;
  • connection structures are unreliable, or production and manufacturing are difficult, etc.
  • the purpose of the present invention is to provide an automatic injection pen that improves many structures in order to obtain an automatic injection pen with a more reliable structure and more thorough use of medicine.
  • the present invention provides an automatic injection pen, which includes a shell, a hidden needle cover, an inner cover, and a syringe assembly; the hidden needle cover is slidably installed in the housing; the top of the hidden needle cover A piston excitation port is provided; a lower spring sleeve is fixed on the inner side of the lower part of the hidden needle sleeve; an inwardly protruding lower spring hook is provided on the upper part of the lower spring sleeve; the inner sleeve is slidably installed on the hidden needle Inside the sleeve; the top of the inner sleeve is provided with an activation window; the outer side of the lower part of the inner sleeve is provided with a chute, the bottom of the chute is closed, and the upper part of the chute is provided with a protruding platform; the lower part The spring hook is stuck in the chute; a needle shrinking spring is provided between the lower part of the inner sleeve;
  • the lower part of the inner sleeve is provided with a contact
  • the trigger claw passes through the window, and the rebound trigger claw is located directly above the trigger claw passing through the window; the rebound trigger claw is located directly above the lower spring hook;
  • the locking excitation mechanism includes a piston assembly, a medicine pushing spring, an upper spring barrel, a hidden needle sleeve, and a pen tube plug;
  • the upper part of the piston assembly is provided with a spring support part, and the spring support part is a pair of elastic claws; the outside of the spring support part is used to store the pusher spring; the upper part of the spring support part is provided with Lock excitation structure;
  • the locking excitation structure on the upper part of the piston assembly includes a spring locking slot, a piston locking slot, and an excitation column;
  • the spring locking slot is located at the upper middle part of the spring support part, the piston locking slot is located at the upper part of the spring support part; the excitation post is located outside the middle upper part of the spring support part;
  • the medicine pushing spring is a compression spring; the upper spring barrel is provided on the outside of the medicine pushing spring;
  • the upper end of the medicine pushing spring is against the top inner side of the upper spring barrel, and the lower end of the medicine pushing spring is against the bottom platform of the spring support part;
  • the top of the upper spring barrel is provided with a piston excitation channel, and a spring locking buckle is provided on the inside;
  • the outer side of the upper spring barrel is provided with the hidden needle sleeve that can move along the axial direction;
  • the top of the hidden needle cover is provided with a piston passage opening; the inside of the hidden needle cover is provided with a piston activation guide plate;
  • the inner side of the piston activation guide plate is provided with an excitation slope
  • the pen tube plug is provided on the outside of the hidden needle cover
  • the inside of the pen barrel plug is provided with a pen barrel locking claw, and the bottom of the pen barrel locking claw is provided with a pen barrel locking hook inward;
  • the locking excitation mechanism includes a locking state and an excitation state
  • the upper part of the spring support part passes through the piston excitation channel on the top of the upper spring barrel and the piston passage on the top of the hidden needle sleeve, and the piston locking slot is stuck into the pen tube plug. into the pen barrel lock claw and cooperates with the pen barrel lock hook;
  • the middle and upper part of the spring support part is stuck on the top of the upper spring barrel, and the spring locking slot is stuck into the spring locking buckle of the upper spring barrel;
  • the medicine pushing spring is in a limited compression state
  • the hidden needle cover is in a downward position, the piston activation guide plate inside the hidden needle cover is located outside the spring support part; and the excitation slope of the piston activation guide plate is located directly below the excitation column;
  • the hidden needle sleeve is in an upper position, the piston activation guide plate moves upward along the outside of the spring support part, the excitation slope contacts the excitation column, and the excitation column is guided to move inward, driving the spring
  • the upper part of the support part shrinks inward;
  • the piston locking slot moves inward and separates from the pen barrel lock hook
  • the spring locking slot moves inward and separates from the spring locking buckle
  • the pusher spring is in an elastic release state
  • the portion of the piston rod portion of the piston assembly located within the barrel of the syringe is provided with a protrusion; the protrusions are symmetrically arranged on both sides of the piston assembly;
  • a linear buffer is provided between the pusher head of the piston assembly and the piston in the syringe;
  • a trigger claw excitation inner support is provided in the trigger claw passage window; the trigger claw excitation inner support is connected with the protruding card platform;
  • the outer surface of the triggering claw excitation inner bracket is lower than the outer surface of the convex clamping platform.
  • piston activation guide plates which are symmetrically arranged at the inner bottom of the piston passage opening;
  • the piston activation guide plate on each side is symmetrically provided with an excitation slope
  • Each excitation column is matched with one excitation slope.
  • a connecting plate is provided between the piston activation guide plates on both sides.
  • a piston locking post is provided in the piston passage opening at the top of the hidden needle sleeve;
  • the piston locking post is located in the middle of the spring support parts on both sides;
  • the piston locking post is located above the spring support part.
  • a connecting plate is provided between the piston locking column and the piston activation guide plate.
  • the upper middle inner side of the spring support part is provided with a locking column unlocking guide groove
  • the clamping column unlocking guide groove cooperates with the piston locking clamping column.
  • a pen tube limiting claw is provided on the outside of the pen barrel locking claw, and the pen barrel limiting claw is a straight blocking piece;
  • Limiting planes are provided on both sides of the piston locking slot
  • the limiting plane matches the pen tube limiting claw.
  • a connecting plate channel is provided in the middle of the pen tube limiting claw.
  • a limiting baffle is provided in the spring locking slot, and a limiting groove is opened in the middle of the spring locking buckle;
  • the hidden needle cover is the only activating component, which can move upward for activating.
  • the protrusion is integrally formed with the piston assembly
  • the outer diameter of the protrusion is larger than the inner diameter of the needle barrel
  • a cavity is formed on the inside of the protrusion, and the protrusion has transverse elasticity.
  • the linear buffer includes a shell sleeve and a buffer plug
  • the bottom of the shell is connected to the piston, and the top of the buffer plug is connected to the pusher head;
  • a sealing ring is provided between the shell sleeve and the upper part of the buffer plug, and the sealing ring slides and seals the connection part;
  • a first buffer chamber is formed between the bottom of the buffer plug and the bottom of the inner cavity of the shell;
  • a small connecting channel is provided between the first buffer chamber and the second buffer chamber;
  • the top of the trigger claw triggering inner support is provided with a guide slope.
  • a sheath tube is provided on the inside of the pen cap, and a groove is provided on the upper part of the sheath tube;
  • the upper part of the sheathing tube is open and elastic.
  • a sheathing tube is provided on the inside of the pen cap, and a fixed buckle structure is provided on the lower part;
  • the lower part of the sheathing tube is pulled out to form a hollow, and an elastic claw is provided in the hollow chamber, and a claw protrusion is provided below the elastic claw;
  • the claw protrusion is set outward and exceeds the outer surface wall of the sheathing tube
  • the upper and lower sides of the claw protrusion form guide slopes
  • a clamping protrusion is provided inward at the bottom of the protruding sleeve below the hidden needle sleeve;
  • the clamping protrusion crosses the highest protrusion from above the elastic claw and reaches the bottom of the elastic claw.
  • the elastic claw resets elastically and resists the clamping protrusion of the hidden needle cover.
  • an elastic fixing buckle is provided on the lower spring cover.
  • Three sides of the elastic fixing buckle are hollowed out, and only the bottom is connected to the main body of the lower spring cover;
  • the upper part of the elastic fixing buckle is a support limiter, which protrudes into the lower spring cover fixing opening of the hidden needle cover in a natural state;
  • a guide slope is provided below and inwardly of the support limiting portion
  • the hidden needle cover is provided with a bottom bracket.
  • the automatic injection pen of the present invention has the following improvements compared to the previous design:
  • the structure of the pen cap itself has been improved, which not only facilitates installation, but also improves the reliability of the connection before use, and improves the reliability of the storage and transportation process;
  • a linear buffer is installed between the pusher head of the piston assembly and the piston in the syringe to delay the occurrence of the needle shrinking action, which not only ensures clean injection of the medicine, improves the utilization rate of the medicine, but also ensures that the medicine is injected There is a certain pause time afterwards to meet the injection requirements;
  • the automatic injection pen of the present invention has a more reliable structure, can use the medicine more thoroughly, and can better meet the storage, transportation and use needs of the medicine in the disposable syringe.
  • Figure 1 is an overall structural outline view of the automatic injection pen of the present invention in an unused state
  • Figure 2 is a cross-sectional view of the overall structure of the automatic injection pen of the present invention when it is not in use;
  • Figure 3 is a schematic structural diagram of the automatic injection pen of the present invention when it is ready for use (the process of pulling out the pen cap);
  • Figure 4 is a schematic structural diagram of the automatic injection pen of the present invention when it is ready for use (after removing the pen cap);
  • Figure 5 is a schematic diagram of the internal structure of the pen cap of the automatic injection pen of the present invention.
  • Figure 6 is an internal cross-sectional view of the pen cap of the automatic injection pen of the present invention.
  • Figure 7 is a schematic diagram of the fixing structure of the pen cap of the present invention.
  • Figure 8 is a schematic structural diagram of the inner side of the pen tube stopper of the present invention.
  • Figure 9 is a schematic diagram of the overall structure of the hidden needle sheath of the present invention.
  • Figure 10 is a cross-sectional view of the upper inner side of the hidden needle sheath of the present invention.
  • Figure 11 is a schematic diagram of the overall structure of the piston assembly of the present invention.
  • Figure 12 is a schematic diagram of the upper structure of the piston assembly of the present invention.
  • Figure 13 is a schematic diagram of the assembly process state 1 of the piston assembly and the upper spring barrel;
  • Figure 14 is a schematic diagram of the assembly process state 2 of the piston assembly and the upper spring barrel;
  • Figure 15 is a schematic diagram of the internal structure in the locked state
  • Figure 16 is a schematic diagram of the partial combination structure in the locked state
  • Figure 17 is a partial schematic diagram of the activation unlocking process (not unlocked).
  • Figure 18 is an overall internal schematic diagram of the trigger unlocking process (unlocked).
  • Figures 19 and 20 are schematic diagrams of the anti-rotation structure of the spring locking slot
  • Figures 21 and 22 are schematic diagrams of the anti-rotation structure of the piston locking slot
  • Figure 23 and Figure 24 are schematic structural diagrams of the connecting plate channel
  • Figure 25 is a schematic diagram of the overall structure of the piston assembly of the present invention, which is the same as Figure 11, but with different labels;
  • Figure 26 is a schematic diagram of the assembled state of the piston rod part of the present invention in the syringe
  • Figure 27 is a schematic diagram of the installation of the linear buffer of the present invention.
  • Figure 28 is a schematic diagram of the specific structure of the linear buffer of the present invention.
  • Figure 29 is a schematic diagram of the arrangement of the trigger claw excitation inner support of the present invention.
  • Figure 30 is a schematic diagram of the use state of the trigger claw activating inner support of the present invention.
  • Figure 31 is a schematic diagram 1 of the connection structure between the hidden needle cover and the lower spring cover of the present invention.
  • Figure 32 is a schematic diagram 2 of the connection structure between the hidden needle cover and the lower spring cover of the present invention.
  • Figure 33 is a schematic diagram 1 of the working process of the present invention, showing the unlocking process of unlocking
  • Figure 34 is a schematic diagram 2 of the working process of the present invention, showing the unlocked excitation unlocking process
  • Figure 35 is a schematic diagram 3 of the working process of the present invention, showing the acupuncture process
  • Figure 36 is a schematic diagram 4 of the working process of the present invention, showing the injection process
  • Figure 37 is a schematic diagram 5 of the working process of the present invention, showing the working process of the linear buffer after injection;
  • Figure 38 is a schematic diagram 6 of the working process of the present invention, showing the needle shrinking process after the injection is completed;
  • the present invention is a structural improvement of the automatic injection pen with Chinese Patent Publication No. CN113499513A; the names of parts with reference signs in the drawings of this application can refer to the reference signs with Chinese Patent Publication No. CN113499513A;
  • Figure 1 shows the automatic injection pen of the present invention.
  • Figure 2 is a sectional view of the overall structure of the automatic injection pen of the present invention when it is not in use;
  • Figures 3 and 4 are structural schematic diagrams of the automatic injection pen of the present invention when it is ready for use;
  • the overall structure of the auto-injection pen remains similar, but many details have been improved.
  • Improvement 1 Improve the pen cap 23.
  • the upper part of the sheathing tube 236 is provided with grooves 2361 (see Figure 3). As further shown in Figures 5 and 6, several grooves 2361 are provided along the outer circumference of the upper part of the sheathing tube 236, so that all narrate the protection
  • the upper part of the sleeve 236 is in an open state and has a certain elasticity; during assembly, when docking with the sheath of the syringe needle, the wall surface of the sheath tube 236 can be opened outward to facilitate the entry of the sheath; after the sheath enters, Affected by the elastic force of the material, it can return to the tubular shape, and the sheath can be caught by the sheath protrusions. Then, the sheath of the needle can be removed together with the action of pulling out the pen cap 23.
  • the present application provides a fixed buckle structure at the lower part of the sheath-pulling tube 236. Specifically, as shown in Figures 5 and 6, the present application forms a hollow at the lower part of the sheath-pulling tube 236, and there is a hollow chamber inside the hollow chamber.
  • Elastic claws 2362 are further provided with claw protrusions 2363 below the elastic claws 2362; preferably there are two elastic claws 2362, which are relatively arranged at the lower part of the sheathing tube 236.
  • the claw protrusions 2363 are arranged outward and beyond the outer surface wall of the sheathing tube 236; the upper and lower sides of the claw protrusions 2363 form guide slopes.
  • a clamping protrusion is provided inward at the bottom of the protruding sleeve 31 (which protrudes from the pen barrel body 21 when not in use, as shown in Figures 3 and 4) below the hidden needle sleeve 3.
  • the clamping protrusion 311 crosses the highest protrusion from above the elastic claw 2362 and reaches the bottom of the elastic claw 2362.
  • the elastic claw 2362 is reset by the elastic force of the material and resists the hidden needle.
  • the clamping protrusion 311 of the cover 3 at this time, the upper part of the pen cap 23 is mechanically limited by the pen barrel body 21, and the lower part is limited by the clamping protrusion 311 of the hidden needle cover 3.
  • the elastic claw 2362 is stressed It is compressed inward to provide an outward elastic force to the clamping protrusion 311, and is acted by the slope below the elastic claw 2362, further exerting a downward component force on the clamping protrusion 311, so that the clamping protrusion 311 can be held more reliably.
  • the clamping protrusion 311 can also cross the clamping protrusion 311 again under the action of external force and return to the free state, so that The hidden needle cover 3 and the pen cap 23 are separated.
  • Improvement 2 Improve the locking excitation mechanism.
  • the main parts involved in the locking excitation mechanism include: the inner upper part of the pen tube plug 22, the hidden needle sleeve 3, the upper part of the piston assembly 4, the medicine pushing spring 51, and the upper spring barrel 6.
  • a locking limiting mechanism is provided at the upper inner part of the pen barrel plug 22, including a pen barrel locking claw 221; a pen barrel locking hook 222 is provided inwardly at the bottom of the pen barrel locking claw 221; so
  • the pen tube locking claws 221 are arranged oppositely, and the pen tube limiting claws 223 are also provided on both sides of the pen tube locking claws 221.
  • the pen tube limiting claws 223 are straight blocking pieces.
  • the hidden needle cover 3 adopts a split design due to its more complex internal structure, and is divided into a hidden needle structure 31 and an excitation structure 32; at the top of the hidden needle cover 3, there is still a There is an opening similar to the piston excitation port, but it is a piston passing port 321; and the interior of the excitation structure 32 is shown in Figure 10 and includes a piston locking post 322 and a piston activation guide plate 323.
  • the piston locking column 322 is located in the middle of the piston passing openings 321 on both sides; the piston activation guide plate 323 is preferably provided with two, symmetrically arranged on both sides of the piston locking column 322; in the The inner side of the piston activation guide plate 323 is provided with an excitation slope 3231, which is preferably arranged symmetrically on the piston activation guide plate 323 on each side, and is preferably arranged symmetrically with respect to the piston locking insert 322.
  • a connecting plate 324 is provided between the piston activation guide plates 323 on the two sides for connection and reinforcement; the top thereof is further connected to the piston locking column 322 for reinforcement.
  • the piston assembly 4 still includes a lower push head, a piston rod, a push rod, and a trigger claw.
  • the platform formed on the upper part of the push rod and the trigger claw is still provided.
  • the upper locking excitation structure of the piston assembly 4 includes a spring locking slot 45 , a piston locking slot 46 , and an excitation post 47 .
  • the piston locking slot 46 is used to cooperate with the pen barrel lock claw 221 of the pen barrel plug 22 to lock and fix the piston assembly 4 in the shell of the automatic injection pen when it is not activated; the piston
  • the locking slot 46 includes a groove body 461 that cooperates with the pen barrel lock hook 222; and an insertion guide slope 462 is provided on the upper part of the groove body 461 for guidance during assembly.
  • the upper middle inner side of the piston assembly 4 is preferably provided with a clamping post unlocking guide groove 48 , which cooperates with the piston locking post 322 .
  • the upper spring barrel 6 is still combined with the upper part of the piston assembly 4, and the pusher spring 51 is provided between the two; the top of the upper spring barrel 6 is provided with
  • the piston excitation channel 61 has a spring locking buckle 62 inside; the upper part of the piston assembly 4 passes through the piston excitation channel 61, and the spring locking slot 45 matches the spring locking buckle 62 , to achieve clamping, thereby connecting the piston assembly 4 and the upper spring barrel 6 together.
  • FIG 15 it is a schematic diagram of the internal structure in the locked state.
  • the components from the inside to the outside are the piston assembly 4, the medicine pushing spring 51, the upper spring barrel 6, the hidden needle sleeve 3, and the pen tube plug 22.
  • the spring support portion 44 of the piston assembly 4 covers the medicine pushing spring 51.
  • An upper spring barrel 6 is provided on the outside of the medicine pushing spring 51; the upper and lower ends of the medicine pushing spring 51 are respectively pressed against the upper spring.
  • the spring locking slot 45 of the spring support part 44 is buckled with the spring locking buckle 62 to combine the piston assembly 4 and the upper spring barrel 6 to keep the medicine pushing spring 51 compressed state.
  • the upper part of the spring support part 44 passes through the piston excitation channel 61 and the piston passage opening 321 in sequence, and then is inserted into the locking and limiting mechanism of the pen barrel plug 22, so that the piston locking groove 46 and the Including the pen tube locking claw 221 to fasten the
  • the piston assembly 4 is combined with the pen barrel plug 22 so that the components in the hidden needle sleeve 3 are fixed at the lower part of the pen barrel plug 22 .
  • the piston locking post 322 is inserted into the spring support part 44 and retained in the post unlocking guide groove 48 to keep the upper part of the spring support part 44 outward.
  • the open state keeps the above two buckle interfaces in a reliable clamping state to prevent them from being detached, unlocked and activated during storage and transportation.
  • the hidden needle cover 3 is the only activating component, and it can move upward for activation.
  • Excitation columns 47 are provided on both sides of the upper part of the spring support part 44, which correspond to the excitation slope 3231 on the piston activation guide plate 323; at this time, the piston activation guide plate 323 also moves upward, causing the piston activation guide plate 323 to move upward.
  • the excitation slope 3231 is getting closer to the excitation column 47 .
  • a limiting baffle 451 is provided in the spring locking slot 45, and as shown in Figure 20, a limiting groove 621 is provided in the middle of the spring locking buckle 62; when the spring locking groove 45 and the spring locking buckle 62 are matched together, the limiting baffle 451 is snapped into the limiting groove 621, which can offset the circumferential rotation force and prevent the piston assembly from 4 rotates in the upper spring barrel 6 .
  • limiting planes 463 are provided on both sides of the piston locking slot 46, which cooperate with the pen tube limiting claw 223 (as shown in Figure 22); when the When the piston locking slot 46 and the pen barrel lock hook 222 are matched together, the pen barrel limiting claw 223 blocks the limiting plane 463, which can offset the circumferential rotation force and prevent the piston assembly from 4 rotates in the pen barrel plug 22.
  • a connecting plate channel 224 is opened in the middle of the pen tube limiting claw 223; when the hidden needle sleeve 3 moves up relatively due to the need for activation, the piston lock
  • the tightening post 322 enters the cavity formed by the pen barrel locking claw 221 and the pen barrel limiting claw 223, and the connecting plate 324 is inserted into the pen barrel limiting claw 223.
  • the connecting plate channel 224 opened in the middle allows for barrier-free passage.
  • the pen tube plug 22, the upper spring barrel 6, and the piston assembly 4 are connected together, making the locking more reliable and preventing false triggering.
  • the medicine pushing spring 51 to be released causes the medicine pushing spring 51 to be released; and the stimulation is carried out by the upward movement of the hidden needle cover 3, and the operation is still simple and easy to operate.
  • Improvement 3 Improve the lower structure of piston assembly 4.
  • the lower part of the piston assembly 4 the part located inside the needle barrel 11 of the syringe, that is, the lower part of the piston rod part 42 is provided with protrusions 421, which are preferably symmetrically arranged on both sides of the piston assembly 4;
  • the protrusion 421 is preferably formed from the own material of the piston assembly 4 during injection molding.
  • the outer diameter of the protrusion 421 is larger than the inner diameter of the needle barrel 11 .
  • the protrusion 421 has a certain elasticity; the elasticity of the protrusion 421 can be formed by forming a cavity 422 inside the protrusion 421 so that the protrusion 421 has an elastic space.
  • the piston assembly 4 can still move within the syringe 11 under the elastic force of the medicine pushing spring 51 after release, to achieve medicine injection; however, due to the gap between the protrusion 421 and the inner wall of the syringe 11 The additional friction between the two can make the medicine push spring 51 be released, first push the entire syringe and piston assembly 4 to move downward together, so that the needle is inserted into the injection target, that is, needle insertion is given priority; and then the medicine push spring 51 continues to be released. The elastic force then pushes the piston assembly 4 to move in the syringe 11 to perform push injection.
  • Improvement 4 Improve the needle narrowing mechanism.
  • the medicine pushing injection will be realized.
  • the rebound trigger claw of the piston assembly 4 will be triggered to pull out the needle; in the existing design, this part is performed continuously, even when the medicine is pushed.
  • the rebound trigger claw of the piston assembly 4 must immediately trigger the lower spring hook of the lower spring sleeve 8, otherwise there will be interference in the mechanical structure, which may cause the medicine to The injection is incomplete, and the needle is withdrawn without any pause after the drug is pushed.
  • the drug has not yet stabilized in the human body and may be taken out with the needle withdrawal action. Therefore, corresponding structural improvements are needed to delay needle withdrawal. action.
  • a linear buffer is mainly provided between the pusher part 41 of the piston assembly 4 and the piston 111 in the needle barrel 11 to delay the occurrence of the needle narrowing action.
  • the linear buffer includes a shell 411 and a buffer plug 412; the bottom of the shell 411 is connected to the piston 111, and the top of the buffer plug 412 is connected to the pusher head 41.
  • a sealing ring 413 is provided between the shell sleeve 411 and the upper part of the buffer plug 412 to slidely seal the connection part.
  • the sealing here is preferably capable of properly leaking air (exhaust) to the outside without causing obvious liquid leakage ( liquid is not discharged);
  • a first buffer cavity 414 is formed between the bottom of the buffer plug 412 and the bottom of the inner cavity of the shell 411;
  • a depression is provided in the middle of the buffer plug 412, and a second buffer cavity is formed between the bottom of the buffer plug 412 and the inner wall of the shell 411 415;
  • a small connecting channel is provided between the first buffer chamber 414 and the second buffer chamber 415.
  • buffer fluid 416 is injected into the first buffer chamber 414; the buffer fluid 416 is a high-viscosity fluid, and its viscosity is greater than that of the medicine.
  • the pusher spring 51 When the pusher spring 51 is released and the pusher injection is performed, the spring force is exerted on the piston assembly 4, and the push force is transmitted from the pusher head 41 to the buffer plug 412; the buffer plug 412 mainly squeezes all the materials in the first buffer chamber 414.
  • the buffer fluid 416 then transmits the thrust to the sleeve 411, and finally pushes the piston 111 to move in the syringe 11 to push the medicine; at this time, the buffer fluid 416 will also slowly flow into the second buffer chamber under the action of thrust. 415, but the flow speed is slower than the injection speed of the medicine, so the force is mainly used for pushing medicine injection.
  • the gas in the second buffer chamber 415 can be discharged outward through the sealing gap of the sealing ring 413, which will further cause similar problems.
  • the location is relatively stable.
  • the linear buffer By arranging the linear buffer, on the one hand, it is possible to ensure that the medicine is completely injected, and to form a buffer period from the time the medicine is injected to the time when the needle is withdrawn, delaying the needle withdrawal, and meeting the pause requirements after injection.
  • a trigger claw excitation inner support 79 is provided in the trigger claw passage window 75; the trigger claw excitation inner support 79 and the protruding clamping platform 74 and other structures are connected together and have good structural rigidity; the outer surface of the trigger claw excitation inner bracket 79 is lower than the outer surface of the convex clamping platform 74 .
  • the top of the trigger claw activating inner support 79 may also be provided with a guide slope 791 for guiding the rebound trigger claw 49 when it enters.
  • the rebound trigger claw 49 can be fully utilized to push the lower spring hook 85 away; that is, the rebound trigger claw 49 can be prevented from shrinking inward (the rebound trigger claw 49 is a cantilever structure), the lower spring hook 85 cannot be fully pushed outward to separate from the convex clamping platform 74.
  • Improvement 5 Improve the connection structure between the hidden needle sleeve 3 and the lower spring sleeve 8.
  • the hidden needle cover 3 and the lower spring cover 8 are connected through buckles; the lower spring cover fixing buckle provided on the lower spring cover 8 in the original design is a straight buckle, which can only be installed through the elastic deformation of the material.
  • the installation process requires a lot of force. Big force.
  • an elastic fixing buckle 82 is provided on the lower spring sleeve 8.
  • Three sides of the elastic fixing buckle 82 are hollow, and only the bottom part and the main body of the lower spring sleeve 8 are hollow.
  • Connection; the upper part of the elastic fixing buckle 82 is a support limiter 821, which protrudes into the lower spring sleeve fixing opening 33 of the hidden needle cover 3 in a natural state; the support limiter 821 is provided downwardly and inwardly.
  • the hidden needle cover 3 is provided with a bottom bracket 333.
  • Figures 1 and 2 are in an incomplete and unused state
  • the medicine pushing spring Before use, the medicine pushing spring is in a compressed state and the needle shrinking spring is in an expanded state;
  • Figure 4 shows the ready-to-use state.
  • the operator grasps the main body 21 of the pen tube with his hand, then presses the bottom of the hidden needle cover 3 against the skin of the site to be injected, and then presses down hard to lower the main body 21 of the pen tube. Move it to the skin of the part to be injected, and then the automatic injection pen of the present invention is activated to start the automatic injection operation;
  • the spring support part shrinks inward and is no longer in contact with the pen tube plug.
  • the medicine pushing spring is in a free state and begins to release its elastic force; further refer to Figure 18; the lower spring hook completely hooks the convex clamping platform , the needle shrinking spring is compressed to store energy;
  • the medicine pushing spring is continuously released, overcoming the friction between the bulge at the lower part of the piston rod and the syringe wall, and injecting the medicine in the syringe into the patient's body;

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Abstract

一种自动注射笔，包括外壳、隐针套（3）、内套、及注射器组件；对笔帽（23）结构进行了改进；对激发机构进行了改进，增加了未使用状态下的锁定机构；对活塞组件（4）的活塞杆部（42）进行改进，增加了弹性凸起结构；在活塞组件的推头部（41）与针筒（11）内的活塞（111）之间设置直线缓冲器，来延迟收针动作的发生；在触发爪穿过窗（75）内设有触发爪激发内托（79），对回弹触发爪（49）的激发过程提供支撑；对隐针套（3）与下弹簧套（8）之间的连接结构进行改进。该自动注射笔，结构更可靠，药剂使用更彻底，能够更好的满足一次性注射器内药剂的储运、使用需求。

Description

自动注射笔 技术领域
本发明涉及一种自动注射笔，属于医疗注射器械领域。
背景技术
申请人在先申请并公开了中国专利公开号为CN113499513A的自动注射笔，采用自动注射装置，弹簧联动，实现握住笔管主体的一次下压操作，完成全套的扎针、注射、收针动作，即将容纳在其中的一次性注射器推出、推药、并拔针隐藏，减少了操作者的操作动作，实现了可靠的药物注射。
但在实际使用过程中，还存在一些不足之处：
(1)激发机构缺乏锁定结构，导致存在运输过程中被意外释放的风险；
(2)部分连接结构不可靠，或生产制造困难等；
(3)部分动作执行不彻底，如推药不彻底等，造成一些不便；
故，有必要对自动注射笔的结构进一步进行改进，以期获得结构更加可靠，药剂使用更彻底的自动注射笔，满足一次性注射器内药剂的储运、使用需求。
发明内容
本发明的目的在于提供一种自动注射笔，对多处结构进行改进，以期获得结构更加可靠，药剂使用更彻底的自动注射笔。
为达到上述发明目的，本发明提供了一种自动注射笔，包括外壳、隐针套、内套、及注射器组件；所述隐针套滑动安装在所述外壳内；所述隐针套的顶部设有活塞激发口；所述隐针套的下部内侧固定有下弹簧套；所述下弹簧套的上部设有向内凸起的下弹簧卡勾；所述内套滑动安装在所述隐针套内；所述内套的顶部设有激发开窗；所述内套的下部外侧设有滑槽，所述滑槽的底部封闭，所述滑槽的上部设有凸卡台；所述下弹簧卡勾卡在所述滑槽内；所述内套的下部与所述下弹簧套之间设有收针弹簧；所述注射器组件包括针筒、针头、及活塞组件；所述针筒安装所述内套内；所述针筒的底部安装有针头；所述针筒的上部内设有活塞组件；所述活塞组件从下至上依次包括推头部、推杆部、弹簧支撑部、锁紧凸起、激发导向部、及激发头；在所述推杆部的外侧，还设有回弹触发爪；所述锁紧凸起预卡在所述内套顶部的所述激发开窗上，所述弹簧支撑部外侧设有推药弹簧，所述推药弹簧预压缩顶在所述内套的内侧顶部；所述激发导向部预穿过所述隐针套顶部的活塞激发口；所述内套的下部上设有触 发爪穿过窗，所述回弹触发爪位于所述触发爪穿过窗的正上方；所述回弹触发爪且位于所述下弹簧卡勾的正上方；
其中，锁定激发机构包括活塞组件、推药弹簧、上弹簧筒、隐针套、笔管塞；
所述活塞组件的上部设有弹簧支撑部，所述弹簧支撑部为一对弹性爪片；所述弹簧支撑部的外侧用于储纳所述推药弹簧；所述弹簧支撑部的上部设有锁定激发结构；
所述活塞组件的上部的锁定激发结构，包括弹簧锁紧卡槽、活塞锁紧卡槽、及激发柱；
所述弹簧锁紧卡槽位于所述弹簧支撑部的中上部，所述活塞锁紧卡槽位于所述弹簧支撑部的上部；所述激发柱位于所述弹簧支撑部的中上部外侧；
所述推药弹簧为压缩弹簧；所述推药弹簧的外部设有所述上弹簧筒；
所述推药弹簧的上端抵在所述上弹簧筒的顶部内侧，所述推药弹簧的下端抵在所述弹簧支撑部的底部平台上；
所述上弹簧筒的顶部设有活塞激发通道，其内侧设有弹簧锁紧扣；
所述上弹簧筒的外侧套设有可沿轴向活动运动的所述隐针套；
所述隐针套的顶部设有活塞穿过口；所述隐针套的内侧设有活塞激活导板；
所述活塞激活导板的内侧，设有激发斜面；
所述隐针套的外侧设有所述笔管塞；
所述笔管塞的内部设有笔管锁爪，所述笔管锁爪的底部向内设有笔管锁钩；
锁定激发机构包括锁定状态，及激发状态；
所述锁定激发机构的锁定状态为：
所述弹簧支撑部的上部穿过所述上弹簧筒顶部的活塞激发通道、及所述隐针套顶部的活塞穿过口，将所述活塞锁紧卡槽卡入所述所述笔管塞的笔管锁爪内，并与所述笔管锁钩配合；
所述弹簧支撑部的中上部卡在所述上弹簧筒的顶部，将所述弹簧锁紧卡槽卡入所述上弹簧筒的弹簧锁紧扣内；
所述推药弹簧处于受限压缩状态；
所述隐针套处于下方位置，所述隐针套内侧的活塞激活导板，位于所述弹簧支撑部的外侧；且所述活塞激活导板的激发斜面，位于所述激发柱的正下方；
所述锁定激发机构的激发状态为：
所述隐针套处于上方位置，所述活塞激活导板沿所述弹簧支撑部的外侧上移，所述激发斜面与所述激发柱接触，所述激发柱受导向向内移动，带动所述弹簧支撑部的上部向内收缩；
且所述激发柱逐渐移动到所述激发斜面的底部自由空间；
所述活塞锁紧卡槽向内运动，与所述笔管锁钩相脱离；
所述弹簧锁紧卡槽向内运动，与所述弹簧锁紧扣相脱离；
所述推药弹簧处于弹力释放状态；
活塞组件的活塞杆部位于注射器的针筒内的部分设有凸起；所述凸起对称设置在所述活塞组件的两侧；
在活塞组件的推头部与针筒内的活塞之间设置直线缓冲器；
在触发爪穿过窗内设有触发爪激发内托；所述触发爪激发内托与凸卡台连接在一起；
所述触发爪激发内托的外表面低于所述凸卡台的外表面。
作为本发明的进一步改进，所述活塞激活导板设有2个，对称设置在所述活塞穿过口的内侧底部；
每侧的所述活塞激活导板上对称设有激发斜面；
所述激发柱设有4个，分别位于两边的所述弹簧支撑部的两侧；
每个所述激发柱与1个所述激发斜面相配合。
进一步的，两侧的所述活塞激活导板之间设有连接板。
作为本发明的进一步改进，所述隐针套顶部的活塞穿过口内设有活塞锁紧卡柱；
锁定激发机构处于锁定状态时，所述活塞锁紧卡柱位于两边的所述弹簧支撑部的中间；
锁定激发机构处于激发状态时，所述活塞锁紧卡柱位于所述弹簧支撑部的上方。
进一步的，所述活塞锁紧卡柱与所述活塞激活导板之间设有连接板。
进一步的，所述弹簧支撑部的上部中间内侧，设有卡柱解锁导槽；
所述卡柱解锁导槽与所述活塞锁紧卡柱相配合。
作为本发明的进一步改进，所述笔管锁爪的外侧设有笔管限位爪，所述笔管限位爪为平直的挡片；
所述活塞锁紧卡槽的两侧设有限位平面；
所述限位平面与所述笔管限位爪相配合。
进一步的，所述笔管限位爪的中间开设有连接板通道。
作为本发明的进一步改进，在所述弹簧锁紧卡槽内设有限位挡板，在所述弹簧锁紧扣中间开设有限位槽；
所述弹簧锁紧卡槽与所述弹簧锁紧扣配合在一起时，所述限位挡板卡入所述限位槽内。
本发明的锁定激发机构，所述隐针套是唯一的激活部件，其可向上运动，进行激发。
作为本发明的进一步改进，所述凸起与活塞组件一体成型；
所述凸起的外径尺寸大于所述针筒的内径尺寸；
所述凸起的内侧形成空腔，所述凸起具有横向弹性。
作为本发明的进一步改进，所述直线缓冲器包括壳套、缓冲塞；
壳套的底部与活塞相连接，缓冲塞的顶部与推头部相连接；
壳套与缓冲塞的上部之间设置密封圈，密封圈对连接部分进行滑动密封；
在缓冲塞的底部与壳套的内腔底部之间形成第一缓冲腔；
缓冲塞的中部设有凹陷，与壳套的内壁之间形成第二缓冲腔；
第一缓冲腔与第二缓冲腔之间设有细小的连接通道；
使用前，在第一缓冲腔内注入适量的缓冲流体。
作为本发明的进一步改进，所述触发爪激发内托的顶部设有导向斜面。
作为本发明的进一步改进，笔帽内侧设有拔护套管，拔护套管的上部开设槽；
所述槽沿所述拔护套管的上部外圆设有若干个；
所述拔护套管的上部呈开放状态，且具有弹性。
作为本发明的进一步改进，笔帽内侧设有拔护套管，的下部设置固定卡扣结构；
拔护套管的下部形成镂空，镂空腔室内设有弹性卡爪，所述弹性卡爪的下方设有卡爪凸起；
所述弹性卡爪设有2个，相对设置在所述拔护套管的下部；
所述卡爪凸起向外设置，超出所述拔护套管外表面壁面；
所述卡爪凸起的上下形成引导斜面；
在隐针套的下方凸出套的底部向内设有卡紧凸起；
笔帽与注射笔主体组装时，卡紧凸起从弹性卡爪的上方越过最高凸点，到达弹性卡爪的下方，弹性卡爪弹性复位，抵住隐针套的卡紧凸起。
作为本发明的进一步改进，所述下弹簧套上设置弹性固定卡扣，所述弹性固定卡扣的三面镂空，仅底部与下弹簧套的主体连接；
所述弹性固定卡扣的上部为支撑限位部，自然状态下突入到隐针套的下弹簧套固定口内；
所述支撑限位部的下方向下向内设有导向斜面；
隐针套上设有底托。
本发明的自动注射笔，相对于之前的设计，做出了如下改进：
(1)对笔帽本身结构进行了改进，即方便了安装，又提高了未使用前的连接可靠性，提高了储运过程的可靠性；
(2)对激发机构进行了改进，增加了未使用状态下的锁定机构，确保未使用时激发机构不会松脱而激发弹簧，导致提前激发、释放药剂；
(3)对活塞组件的活塞杆部进行改进，增加了弹性结构，从而使药剂的推药注射晚于扎针动作，使推药弹簧释放后的动作，呈现明显的先后顺序，提高药剂注射的安全性；
(4)在活塞组件的推头部与针筒内的活塞之间设置直线缓冲器，来延迟收针动作的发生，即能确保药剂注射干净，提高药剂的利用率，又能在药剂注射完毕后有一定的停顿时间，满足注射要求；
(5)在触发爪穿过窗内设有触发爪激发内托，对触发爪的激发过程提供支撑，从而提高收针触发过程的可靠性；
(6)对隐针套与下弹簧套之间的连接结构进行改进，使其即方便工业生产过程中的安装，又能充分可靠的进行锁紧，防止松脱。
本发明的自动注射笔，结构更可靠，药剂使用更彻底，能够更好的满足一次性注射器内药剂的储运、使用需求。
附图说明
图1为本发明自动注射笔未使用状态下的整体结构外形图；
图2为本发明自动注射笔未使用状态下的整体结构剖视图；
图3为本发明自动注射笔准备使用时(拔出笔帽过程)的结构示意图；
图4为本发明自动注射笔准备使用时(移除笔帽后)的结构示意图；
图5为本发明自动注射笔的笔帽的内部结构示意图；
图6为本发明自动注射笔的笔帽的内部剖视图；
图7为本发明笔帽的固定结构示意图；
图8为本发明的笔管塞内侧结构示意图；
图9为本发明的隐针套的整体结构示意图；
图10为本发明的隐针套的上部内侧剖视图；
图11为本发明的活塞组件的整体结构示意图；
图12为本发明的活塞组件的上部结构示意图；
图13为活塞组件与上弹簧筒的组合过程状态1的示意图；
图14为活塞组件与上弹簧筒的组合过程状态2的示意图；
图15为锁定状态的内部结构示意图；
图16为锁定状态的局部组合结构示意图；
图17为激发解锁过程(未解锁)局部示意图；
图18为激发解锁过程(已解锁)整体内部示意图；
图19、图20为弹簧锁紧卡槽部的防转结构示意图；
图21、图22为活塞锁紧卡槽部的防转结构示意图；
图23、图24为连接板通道的结构示意图；
图25为本发明的活塞组件的整体结构示意图，同图11，但标注不同；
图26为本发明的活塞杆部在针筒内的组装状态示意图；
图27为本发明的直线缓冲器的安装示意图；
图28为本发明的直线缓冲器的具体结构示意图；
图29为本发明的触发爪激发内托的设置示意图；
图30为本发明的触发爪激发内托的使用状态示意图；
图31为本发明的隐针套与下弹簧套之间的连接结构示意图1；
图32为本发明的隐针套与下弹簧套之间的连接结构示意图2；
图33为本发明的工作过程示意图1，展示未解锁的激发解锁过程；
图34为本发明的工作过程示意图2，展示已解锁的激发解锁过程；
图35为本发明的工作过程示意图3，展示扎针过程；
图36为本发明的工作过程示意图4，展示注射过程；
图37为本发明的工作过程示意图5，展示注射完毕后的直线缓冲器工作过程；
图38为本发明的工作过程示意图6，展示注射完毕后的收针过程；
主要附图标记：针筒11、针头12；笔管主体21；笔管塞22；笔帽23；
隐针套3；活塞组件4；推药弹簧51、收针弹簧52；
上弹簧筒6；针筒套7；下弹簧套8；针筒护环9。
具体实施方式
以下结合附图对本发明的具体实施方式作进一步详细说明。
本发明是对中国专利公开号为CN113499513A的自动注射笔的结构改进；本申请附图中的附图标记的零部件名称可参考中国专利公开号为CN113499513A的附图标记；图1为本发明自动注射笔未使用状态下的整体结构外形图，图2为本发明自动注射笔未使用状态下的整体结构剖视图；图3、图4为本发明自动注射笔准备使用时的结构示意图；本发明的自动注射笔整体结构保持相似，但对多处细节进行改进。
改进一：对笔帽23进行改进。
(1)拔护套管236的上部改进。拔护套管236的上部开设槽2361(可参见图3)，进一步如图5、图6所示，所述槽2361沿所述拔护套管236的上部外圆设有若干个，使所述拔护 套管236的上部呈开放状态，具有一定弹性；在组装时，与注射器针头的护套对接时，拔护套管236的壁面可以向外张开，方便护套进入；待护套进入后，受材料弹性力作用，又能恢复成管状，利用卡护套凸起将护套卡住，届时可随着拔笔帽23的动作，将针头的护套一起移除。
(2)拔护套管236的下部改进。中国专利公开号为CN113499513A的自动注射笔中，笔帽23仅通过卡紧凹槽与笔管主体21上的卡紧凸起相连接进行固定，下部并无连接固定结构，存在脱落风险。为此，本申请在拔护套管236的下部设置固定卡扣结构，具体来说，如图5、图6所示，本申请在拔护套管236的下部形成镂空，镂空腔室内设有弹性卡爪2362，所述弹性卡爪2362的下方进一步设有卡爪凸起2363；所述弹性卡爪2362优选的设有2个，相对设置在所述拔护套管236的下部，所述卡爪凸起2363向外设置，超出所述拔护套管236外表面壁面；所述卡爪凸起2363的上下形成引导斜面。如图7所示，在隐针套3的下方凸出套31(未使用状态时，凸出于笔管主体21，如图3、图4所示)的底部向内设有卡紧凸起311；笔帽23与注射笔主体组装时，卡紧凸起311从弹性卡爪2362的上方越过最高凸点，到达弹性卡爪2362的下方，弹性卡爪2362受材料弹性力复位，抵住隐针套3的卡紧凸起311；此时笔帽23的上方被笔管主体21机械限位，下方被隐针套3的卡紧凸起311限位，优选的，此时弹性卡爪2362受力向内压缩，从而向卡紧凸起311提供向外的弹性力，且受弹性卡爪2362下方的斜面作用，进一步对卡紧凸起311产生向下的分力，从而可更加可靠的保持如图1、图2所示未使用状态，将笔帽23保持固定；当需要拔除笔帽23时，卡紧凸起311在外力的作用下，也能重新越过卡紧凸起311，恢复自由状态，使隐针套3与笔帽23发生脱离。
改进二：对锁定激发机构进行改进。
锁定激发机构进主要涉及的零件包括：笔管塞22的内侧上部、隐针套3、活塞组件4的上部、推药弹簧51、上弹簧筒6。
(1)笔管塞22
如图8所示，在所述笔管塞22的内部上部设有锁定限位机构，包括笔管锁爪221；所述笔管锁爪221的底部向内设有笔管锁钩222；所述笔管锁爪221相对设置，其两侧还设有笔管限位爪223，所述笔管限位爪223为平直的挡片。
(2)隐针套3
如图9所示，所述隐针套3由于内部结构更为复杂，采用分体设计，分为隐针结构体31，及激发结构体32；在所述隐针套3的顶部，仍设有活塞激发口类似的开口，但为活塞穿过口321；而激发结构体32的内部如图10所示，包括活塞锁紧卡柱322，及活塞激活导板323。
所述活塞锁紧卡柱322位于两侧的活塞穿过口321中间；所述活塞激活导板323优选的设有2个，对称设置在所述活塞锁紧卡柱322的两侧；在所述活塞激活导板323的内侧，设有激发斜面3231，其优选的在每侧所述活塞激活导板323上对称设置，且优选的相对所述活塞锁紧插片322对称设置。2侧的活塞激活导板323之间设有连接板324，进行连接加固；其顶部进一步连接所述活塞锁紧卡柱322，进行加固。
(3)活塞组件4
如图11、图12所示，所述活塞组件4仍包括下部的推头、活塞杆、推杆、及回单触发爪等结构，在推杆及回单触发爪上部形成的平台，仍设有弹簧支撑部44；所述弹簧支撑部44仍为一对弹性爪片，外部可用于储纳所述推药弹簧51，而上部为锁定激发结构。
所述活塞组件4的上部锁定激发结构，包括弹簧锁紧卡槽45、活塞锁紧卡槽46、及激发柱47。
所述活塞锁紧卡槽46，用于与所述笔管塞22的笔管锁爪221相配合，在未启用时，将活塞组件4锁紧固定在自动注射笔的外壳内；所述活塞锁紧卡槽46包括凹槽体461，其与所述笔管锁钩222相配合；而在所述凹槽体461的上部设有卡入导向斜面462，用于组装时的导向。
所述活塞组件4的上部中间内侧，还优选的设有卡柱解锁导槽48，其与所述活塞锁紧卡柱322配合。
(4)上弹簧筒6
如图13、图14所示，所述上弹簧筒6仍与所述活塞组件4的上部进行组合，两者之间设有所述推药弹簧51；所述上弹簧筒6的顶部设有活塞激发通道61，其内侧设有弹簧锁紧扣62；所述活塞组件4的上部穿过所述活塞激发通道61，且所述弹簧锁紧卡槽45与所述弹簧锁紧扣62相配合，实现卡紧，从而将所述活塞组件4与所述上弹簧筒6连接在一起。
如图15所示，为锁定状态下的内部结构示意图，零部件由内至外依次是活塞组件4、推药弹簧51、上弹簧筒6、隐针套3、笔管塞22。
所述活塞组件4的弹簧支撑部44外套着所述推药弹簧51，所述推药弹簧51的外侧设有上弹簧筒6；所述推药弹簧51的上下两端分别抵在所述上弹簧筒6的顶部内侧，及所述弹簧支撑部44的底部。
所述弹簧支撑部44的弹簧锁紧卡槽45与所述弹簧锁紧扣62扣在一起，将所述活塞组件4与所述上弹簧筒6结合在一起，使所述推药弹簧51保持压缩状态。
所述弹簧支撑部44的上部依次穿过活塞激发通道61、活塞穿过口321，然后插入到所述笔管塞22的锁定限位机构内，使所述活塞锁紧卡槽46与所述包括笔管锁爪221相扣紧，将 所述活塞组件4与所述笔管塞22结合在一起，使隐针套3内的部件而已固定在所述笔管塞22的下部。
进一步的，锁定状态下，所述活塞锁紧卡柱322卡入在所述弹簧支撑部44内，保持在所述卡柱解锁导槽48内，使所述弹簧支撑部44的上部保持向外张开状态，使上述2个卡扣接口保持可靠的卡紧状态，防止储运过程中以为脱开、解锁、激活。
此时，所述隐针套3是唯一的激活部件，其可向上运动，进行激发。
进一步，如图16-图18所示，所述隐针套3的激发过程及原理为：
(1)激发前期；即本发明的自动注射笔使用时，所述隐针套3的底部抵压在待注射部位，然后注射笔向下施力，使所述隐针套3相对外壳及内部结构，向上移动；所述隐针套3的活塞锁紧卡柱322沿所述卡柱解锁导槽48向上移动，直至完全移出所述弹簧支撑部44的上部区域，由于不再有所述活塞锁紧卡柱322限制，此时所述弹簧支撑部44的上部可向内收缩变形；
所述弹簧支撑部44的上部两侧设有激发柱47，其与所述活塞激活导板323上的激发斜面3231相对应；此时，所述活塞激活导板323也随着向上移动，使所述激发斜面3231与所述激发柱47越来越接近。
(2)激发过程；所述激发柱47与所述激发斜面3231相接触，使得所述激发柱47带动所述弹簧支撑部44的上部沿所述激发斜面3231向内收缩；在此过程中，所述弹簧锁紧卡槽45、及所述活塞锁紧卡槽46所在部位也随着向内收缩；由此导致，所述弹簧锁紧卡槽45相对所述弹簧锁紧扣62，所述活塞锁紧卡槽46相对所述笔管锁钩222，开始脱离；
(3)注射笔激发；如图18所示，由于所述活塞锁紧卡槽46位于上部，其收缩量更大，会最早与所述笔管锁钩222发生脱离，使所述弹簧支撑部44不再与所述笔管塞22接触；而随着所述弹簧锁紧卡槽45与所述弹簧锁紧扣62彻底脱离，所述弹簧支撑部44不再与所述上弹簧筒6固定；而所述激发柱47也移动到所述激发斜面3231的底部，并与所述激发斜面3231发生脱离，处于自由状态；
此时，所述推药弹簧51的压缩力开始释放，将所述活塞组件4向下推出，开始扎针、注射等动作。
作为本发明的进一步改进，如图19所示在所述弹簧锁紧卡槽45内设有限位挡板451，如图20所示在所述弹簧锁紧扣62中间开设有限位槽621；当所述弹簧锁紧卡槽45与所述弹簧锁紧扣62配合在一起时，所述限位挡板451卡入所述限位槽621内，可以抵消周向旋转力，防止所述活塞组件4在所述上弹簧筒6内发生旋转。
作为本发明的进一步改进，如图21所示所述活塞锁紧卡槽46的两侧设有限位平面463，其与所述笔管限位爪223(如图22所示)配合；当所述活塞锁紧卡槽46与所述笔管锁钩222配合在一起时，所述笔管限位爪223挡在所述限位平面463处，可以抵消周向旋转力，防止所述活塞组件4在所述笔管塞22内发生旋转。
作为本发明的进一步改进，如图23所示在所述笔管限位爪223的中间开设有连接板通道224；当所述隐针套3因激发需要，相对上移时，所述活塞锁紧卡柱322(如图24所示)进入所述笔管锁爪221与所述笔管限位爪223构成的空腔内，而所述连接板324则插入所述笔管限位爪223中间开设的连接板通道224内，无障碍通过。
通过对锁定激发机构的结构改进，使本发明的自动注射笔在未使用时，笔管塞22、上弹簧筒6、及活塞组件4，连接在一起，锁定更加可靠，不会误触发，从而造成推药弹簧51释放；而通过隐针套3的上移进行激发，操作依然简单，易操作。
改进三：对活塞组件4下部结构进行改进。
如图25所示，活塞组件4的下部，位于注射器的针筒11内的部分，即活塞杆部42的下部设有凸起421，优选的对称设置在所述活塞组件4的两侧；该凸起421优选由活塞组件4的自身材料在注塑生成是形成。所述凸起421的外径尺寸大于所述针筒11的内径尺寸。优选的，所述凸起421具有一定弹性；该凸起421的弹性可由在所述凸起421的内侧形成空腔422，从而使凸起421具有弹性让位空间而构成。
如图26所示，当活塞组件4的下部安装进针筒11内时，所述凸起421被挤压变形，紧贴在所述针筒11的内壁上。由于针筒11的内壁较为光滑，故活塞组件4在推药弹簧51释放后的弹力作用下，仍能在针筒11内移动，实现推药注射；但由于凸起421与针筒11内壁之间额外增加的摩擦力，可以使推药弹簧51被释放后，先推动整个针筒及活塞组件4一起向下运动，使针头扎入注射目标内，即扎针优先；而后推药弹簧51继续释放弹力，再推动活塞组件4在针筒11内移动，进行推药注射。
改进四：对收针机构进行改进。
(1)延迟收针动作。
推药弹簧51释放过程中，会实现推药注射，同时完成注射后会使活塞组件4的回弹触发爪去触发进行拔针；现有设计中，该部分是连续进行的，甚至是推药剂的活塞111刚运动到针筒11的末端，活塞组件4的回弹触发爪就得顺势立即触发下弹簧套8的下弹簧卡勾，否则机械结构上就会存在干涉，这就导致药剂可能会注射不完全，且药剂推药完毕后完全没有停顿时间就拔针，使药剂在人体内尚未停留稳定，可能会随着拔针动作被带出；故需要进行相应的结构改进，来延迟收针动作。
如图27、图28所示，主要是在活塞组件4的推头部41与针筒11内的活塞111之间设置直线缓冲器，来延迟收针动作的发生。
所述直线缓冲器包括壳套411、缓冲塞412；其中，壳套411的底部与活塞111相连接，缓冲塞412的顶部与推头部41相连接。
壳套411与缓冲塞412的上部之间设置密封圈413，对连接部分进行滑动密封，该处的密封优选为能够适当的向外泄露空气(排气)，又不会造成明显的液体泄露(不排液体)；在缓冲塞412的底部与壳套411的内腔底部之间形成第一缓冲腔414；缓冲塞412的中部设有凹陷，与壳套411的内壁之间形成第二缓冲腔415；第一缓冲腔414与第二缓冲腔415之间设有细小的连接通道。
使用前，在第一缓冲腔414内注入适量的缓冲流体416；所述缓冲流体416为高粘度的流体，其粘度大于药剂。
当推药弹簧51释放，进行推药注射时，弹簧力施加在活塞组件4上，该推力由推头部41传递给缓冲塞412；缓冲塞412主要通过挤压第一缓冲腔414内的所述缓冲流体416，再将推力传递给壳套411，最后推动活塞111在针筒11内移动，进行推药；此时，缓冲流体416在推力作用下，也会缓慢流动进入到第二缓冲腔415内，但流动速度慢于药剂的注射速度，故力主要用于推药注射。
当推药弹簧51释放后期，直至药剂完全注射完毕，活塞111抵到针筒11的末端；弹簧力继续作用，继续推动缓冲塞412动作，将第一缓冲腔414内的所述缓冲流体416完全排向第二缓冲腔415内，直至完全排完，此时活塞组件4的回弹触发爪与下弹簧套8的下弹簧卡勾接触，将其打开从而使收针弹簧52进行释放，开启收针作业。
第一缓冲腔414内的所述缓冲流体416向第二缓冲腔415内转移过程中，第二缓冲腔415内的气体可以经密封圈413处的密封间隙，向外排出，也会进一步产生类似空气阻尼的效果；当所述缓冲流体416完全进入到第二缓冲腔415内后，所述缓冲流体416因粘度相对较大，是很难再通过密封圈413处的密封间隙进行泄漏，使得该部位处于相对稳定状态。
通过设置所述直线缓冲器，一方面能够确保药剂被完全注射完毕，且使药剂注射完毕到开始拔针，形成一个缓冲期，延缓拔针，满足注射后的停顿要求。
(2)提高收针动作触发可靠性。如图29所示，对针筒套7的结构进行局部改进，具体来说，在触发爪穿过窗75内设有触发爪激发内托79；所述触发爪激发内托79与凸卡台74等结构连接在一起，具有较好的结构刚性；所述触发爪激发内托79的外表面低于所述凸卡台74的外表面。所述触发爪激发内托79的顶部还可设有导向斜面791，用于对回弹触发爪49进入时进行导向。如图30所示，当活塞组件4的回弹触发爪49进入到触发爪穿过窗75内，从 下弹簧套8的下弹簧卡勾85的内侧相接触时，所述触发爪激发内托79抵在所述回弹触发爪49的内侧，可以使更好的使所述回弹触发爪49将下弹簧卡勾85向外顶开，离开凸卡台74而后收针弹簧52释放，各部件沿纵向开始运动，最后下弹簧卡勾85再弹性回弹，进入到滑槽73内。通过设置触发爪激发内托79，可以充分利用所述回弹触发爪49将下弹簧卡勾85顶开；即，可避免所述回弹触发爪49向内收缩(回弹触发爪49为悬臂结构)无法将下弹簧卡勾85充分向外顶开脱离凸卡台74。
改进五：对隐针套3与下弹簧套8之间的连接结构进行改进。
隐针套3与下弹簧套8通过卡扣连接；原设计在下弹簧套8上设置的下弹簧套固定卡扣为直卡扣，只能通过材料的弹性变形才能安装进去，安装过程需要施加较大的力。
如图31、图32所示，为改进后的连接结构，所述下弹簧套8上设置弹性固定卡扣82，所述弹性固定卡扣82的三面镂空，仅底部与下弹簧套8的主体连接；所述弹性固定卡扣82的上部为支撑限位部821，自然状态下突入到隐针套3的下弹簧套固定口33内；所述支撑限位部821的下方向下向内设有导向斜面。同时，在隐针套3上设有底托333。
当将下弹簧套8安装进隐针套3内时，从隐针套3的顶部塞入，所述弹性固定卡扣82的导向斜面逐渐与隐针套3接触，使弹性固定卡扣82受力向内收缩，直至当到达下弹簧套固定口33位置时再弹出；此时下弹簧套8的底部正好抵在底托333上；即实现下弹簧套8在隐针套3内的可靠安装，且上下方向均能可靠承力，不会发生滑脱。
本发明的自动注射笔的使用过程，可参考图1-图4，及图33-图38；
(1)图1、图2为未完全未使用状态；
(2)图3为拔除笔帽，准备使用状态；
使用前，推药弹簧处于压缩状态，收针弹簧处于展开状态；
(4)图4为准备使用状态，此时操作者手部抓住笔管主体21，然后将隐针套3的底部抵在待注射部位皮肤上，然后用力下压，使笔管主体21下移，抵到待注射部分皮肤上，其后本发明的自动注射笔即被激发，开始自动注射作业；
(5)图33所示，隐针套3相对上移，开始触发锁定激发机构；进一步可参考图17；随着隐针套3的运动，收针弹簧被压缩；
(6)图34所示，弹簧支撑部向内收缩，不再与笔管塞接触，推药弹簧处于自由状态，开始释放弹力；进一步可参考图18；下弹簧卡勾完全勾住凸卡台，收针弹簧被压缩储能；
(7)图35所示，推药弹簧释放一部分；活塞杆部下部的凸起与针筒壁之间的摩擦力起作用，先将注射器向下推出，特别是将针头推出，扎入到待注射部分内；
(8)图36所示，推药弹簧持续释放，克服活塞杆部下部的凸起与针筒壁之间的摩擦力，将注射器内的药剂注入患者体内；
(9)图37所示，推药弹簧释放即将完毕时，注射器针筒内的药物被完全注入患者体内，此时直线缓冲器开始起作用；随后，回弹触发爪进入触发爪穿过窗内，将下弹簧卡勾向外顶开；
(10)图38所示，收针弹簧释放，将针头拔出，同时注射器等部件整体向上运动，最后使针头完全隐入到隐针套内，完成注射、拔针。
以上已对本发明创造的较佳实施例进行了具体说明，但本发明创造并不仅限于所述的实施例，熟悉本领域的技术人员在不违背本发明创造精神的前提下还可以作出种种的等同的变型或替换，这些等同变型或替换均包含在本申请权利要求所限定的范围内。

Claims (11)

  1. 自动注射笔，包括外壳、隐针套、内套、及注射器组件；所述隐针套滑动安装在所述外壳内；所述隐针套的顶部设有活塞激发口；所述隐针套的下部内侧固定有下弹簧套；所述下弹簧套的上部设有向内凸起的下弹簧卡勾；所述内套滑动安装在所述隐针套内；所述内套的顶部设有激发开窗；所述内套的下部外侧设有滑槽，所述滑槽的底部封闭，所述滑槽的上部设有凸卡台；所述下弹簧卡勾卡在所述滑槽内；所述内套的下部与所述下弹簧套之间设有收针弹簧；所述注射器组件包括针筒、针头、及活塞组件；所述针筒安装所述内套内；所述针筒的底部安装有针头；所述针筒的上部内设有活塞组件；所述活塞组件从下至上依次包括推头部、推杆部、弹簧支撑部、锁紧凸起、激发导向部、及激发头；在所述推杆部的外侧，还设有回弹触发爪；所述锁紧凸起预卡在所述内套顶部的所述激发开窗上，所述弹簧支撑部外侧设有推药弹簧，所述推药弹簧预压缩顶在所述内套的内侧顶部；所述激发导向部预穿过所述隐针套顶部的活塞激发口；所述内套的下部上设有触发爪穿过窗，所述回弹触发爪位于所述触发爪穿过窗的正上方；所述回弹触发爪且位于所述下弹簧卡勾的正上方；
    其特征在于，锁定激发机构包括活塞组件、推药弹簧、上弹簧筒、隐针套、笔管塞；
    所述活塞组件的上部设有弹簧支撑部，所述弹簧支撑部为一对弹性爪片；所述弹簧支撑部的外侧用于储纳所述推药弹簧；所述弹簧支撑部的上部设有锁定激发结构；
    所述活塞组件的上部的锁定激发结构，包括弹簧锁紧卡槽、活塞锁紧卡槽、及激发柱；
    所述弹簧锁紧卡槽位于所述弹簧支撑部的中上部，所述活塞锁紧卡槽位于所述弹簧支撑部的上部；所述激发柱位于所述弹簧支撑部的中上部外侧；
    所述推药弹簧为压缩弹簧；所述推药弹簧的外部设有所述上弹簧筒；
    所述推药弹簧的上端抵在所述上弹簧筒的顶部内侧，所述推药弹簧的下端抵在所述弹簧支撑部的底部平台上；
    所述上弹簧筒的顶部设有活塞激发通道，其内侧设有弹簧锁紧扣；
    所述上弹簧筒的外侧套设有可沿轴向活动运动的所述隐针套；
    所述隐针套的顶部设有活塞穿过口；所述隐针套的内侧设有活塞激活导板；
    所述活塞激活导板的内侧，设有激发斜面；
    所述隐针套的外侧设有所述笔管塞；
    所述笔管塞的内部设有笔管锁爪，所述笔管锁爪的底部向内设有笔管锁钩；
    锁定激发机构包括锁定状态，及激发状态；
    所述锁定激发机构的锁定状态为：
    所述弹簧支撑部的上部穿过所述上弹簧筒顶部的活塞激发通道、及所述隐针套顶部的活塞穿过口，将所述活塞锁紧卡槽卡入所述所述笔管塞的笔管锁爪内，并与所述笔管锁钩配合；
    所述弹簧支撑部的中上部卡在所述上弹簧筒的顶部，将所述弹簧锁紧卡槽卡入所述上弹簧筒的弹簧锁紧扣内；
    所述推药弹簧处于受限压缩状态；
    所述隐针套处于下方位置，所述隐针套内侧的活塞激活导板，位于所述弹簧支撑部的外侧；且所述活塞激活导板的激发斜面，位于所述激发柱的正下方；
    所述锁定激发机构的激发状态为：
    所述隐针套处于上方位置，所述活塞激活导板沿所述弹簧支撑部的外侧上移，所述激发斜面与所述激发柱接触，所述激发柱受导向向内移动，带动所述弹簧支撑部的上部向内收缩；
    且所述激发柱逐渐移动到所述激发斜面的底部自由空间；
    所述活塞锁紧卡槽向内运动，与所述笔管锁钩相脱离；
    所述弹簧锁紧卡槽向内运动，与所述弹簧锁紧扣相脱离；
    所述推药弹簧处于弹力释放状态；
    活塞组件的活塞杆部位于注射器的针筒内的部分设有凸起；所述凸起对称设置在所述活塞组件的两侧；
    在活塞组件的推头部与针筒内的活塞之间设置直线缓冲器；
    在触发爪穿过窗内设有触发爪激发内托；所述触发爪激发内托与凸卡台连接在一起；
    所述触发爪激发内托的外表面低于所述凸卡台的外表面。
  2. 如权利要求1所述的自动注射笔，其特征在于，所述活塞激活导板设有2个，对称设置在所述活塞穿过口的内侧底部；
    每侧的所述活塞激活导板上对称设有激发斜面；
    所述激发柱设有4个，分别位于两边的所述弹簧支撑部的两侧；
    每个所述激发柱与1个所述激发斜面相配合。
  3. 如权利要求1所述的自动注射笔，其特征在于，所述隐针套顶部的活塞穿过口内设有活塞锁紧卡柱；
    锁定激发机构处于锁定状态时，所述活塞锁紧卡柱位于两边的所述弹簧支撑部的中间；
    锁定激发机构处于激发状态时，所述活塞锁紧卡柱位于所述弹簧支撑部的上方。
  4. 如权利要求3所述的自动注射笔，其特征在于，所述弹簧支撑部的上部中间内侧，设有卡柱解锁导槽；
    所述卡柱解锁导槽与所述活塞锁紧卡柱相配合。
  5. 如权利要求1所述的自动注射笔，其特征在于，所述笔管锁爪的外侧设有笔管限位爪，所述笔管限位爪为平直的挡片；
    所述活塞锁紧卡槽的两侧设有限位平面；
    所述限位平面与所述笔管限位爪相配合。
  6. 如权利要求1所述的自动注射笔，其特征在于，在所述弹簧锁紧卡槽内设有限位挡板，在所述弹簧锁紧扣中间开设有限位槽；
    所述弹簧锁紧卡槽与所述弹簧锁紧扣配合在一起时，所述限位挡板卡入所述限位槽内。
  7. 如权利要求1所述的自动注射笔，其特征在于，所述凸起与活塞组件一体成型；
    所述凸起的外径尺寸大于所述针筒的内径尺寸；
    所述凸起的内侧形成空腔，所述凸起具有横向弹性。
  8. 如权利要求1所述的自动注射笔，其特征在于，所述直线缓冲器包括壳套、缓冲塞；
    壳套的底部与活塞相连接，缓冲塞的顶部与推头部相连接；
    壳套与缓冲塞的上部之间设置密封圈，密封圈对连接部分进行滑动密封；
    在缓冲塞的底部与壳套的内腔底部之间形成第一缓冲腔；
    缓冲塞的中部设有凹陷，与壳套的内壁之间形成第二缓冲腔；
    第一缓冲腔与第二缓冲腔之间设有细小的连接通道；
    使用前，在第一缓冲腔内注入适量的缓冲流体。
  9. 如权利要求1所述的自动注射笔，其特征在于，笔帽内侧设有拔护套管，拔护套管的上部开设槽；
    所述槽沿所述拔护套管的上部外圆设有若干个；
    所述拔护套管的上部呈开放状态，且具有弹性。
  10. 如权利要求1所述的自动注射笔，其特征在于，笔帽内侧设有拔护套管，的下部设置固定卡扣结构；
    拔护套管的下部形成镂空，镂空腔室内设有弹性卡爪，所述弹性卡爪的下方设有卡爪凸起；
    所述弹性卡爪设有2个，相对设置在所述拔护套管的下部；
    所述卡爪凸起向外设置，超出所述拔护套管外表面壁面；
    所述卡爪凸起的上下形成引导斜面；
    在隐针套的下方凸出套的底部向内设有卡紧凸起；
    笔帽与注射笔主体组装时，卡紧凸起从弹性卡爪的上方越过最高凸点，到达弹性卡爪的下方，弹性卡爪弹性复位，抵住隐针套的卡紧凸起。
  11. 如权利要求1所述的自动注射笔，其特征在于，所述下弹簧套上设置弹性固定卡扣，所述弹性固定卡扣的三面镂空，仅底部与下弹簧套的主体连接；
    所述弹性固定卡扣的上部为支撑限位部，自然状态下突入到隐针套的下弹簧套固定口内；
    所述支撑限位部的下方向下向内设有导向斜面；
    隐针套上设有底托。
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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5681291A (en) * 1992-11-19 1997-10-28 Tebro S.A. Disposable auto-injector for prefilled syringes
CN106492313A (zh) * 2016-12-27 2017-03-15 甘肃成纪生物药业有限公司 一种卡式全自动注射笔
CN108434556A (zh) * 2018-05-23 2018-08-24 苏州鹏烨医疗科技有限公司 注射笔
CN108607136A (zh) * 2018-05-04 2018-10-02 上海优米泰医疗科技有限公司 带有隐藏注射针头的定量注射笔
CN109172946A (zh) * 2018-08-31 2019-01-11 上海久森医疗科技有限公司 自动注射笔
US20190111214A1 (en) * 2017-10-16 2019-04-18 Richard David GILLESPIE, III Self-retracting mechanized syringe and methods of use
CN209154759U (zh) * 2018-08-31 2019-07-26 上海久森医疗科技有限公司 自动注射笔的锁定机构及自动注射笔
CN110292683A (zh) * 2019-07-31 2019-10-01 派格生物医药(苏州)有限公司 被动触发装置的自动注射笔
CN113499513A (zh) * 2021-06-28 2021-10-15 苏州赛卫生物科技有限公司 自动注射笔
CN114055793A (zh) * 2021-12-07 2022-02-18 深圳惠迈智能科技有限公司 一种自动注射笔、装配治具组件和自动注射笔装配方法

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5681291A (en) * 1992-11-19 1997-10-28 Tebro S.A. Disposable auto-injector for prefilled syringes
CN106492313A (zh) * 2016-12-27 2017-03-15 甘肃成纪生物药业有限公司 一种卡式全自动注射笔
US20190111214A1 (en) * 2017-10-16 2019-04-18 Richard David GILLESPIE, III Self-retracting mechanized syringe and methods of use
CN108607136A (zh) * 2018-05-04 2018-10-02 上海优米泰医疗科技有限公司 带有隐藏注射针头的定量注射笔
CN108434556A (zh) * 2018-05-23 2018-08-24 苏州鹏烨医疗科技有限公司 注射笔
CN109172946A (zh) * 2018-08-31 2019-01-11 上海久森医疗科技有限公司 自动注射笔
CN209154759U (zh) * 2018-08-31 2019-07-26 上海久森医疗科技有限公司 自动注射笔的锁定机构及自动注射笔
CN110292683A (zh) * 2019-07-31 2019-10-01 派格生物医药(苏州)有限公司 被动触发装置的自动注射笔
CN113499513A (zh) * 2021-06-28 2021-10-15 苏州赛卫生物科技有限公司 自动注射笔
CN114055793A (zh) * 2021-12-07 2022-02-18 深圳惠迈智能科技有限公司 一种自动注射笔、装配治具组件和自动注射笔装配方法

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