WO2022077910A1 - 一种自动注射器 - Google Patents
一种自动注射器 Download PDFInfo
- Publication number
- WO2022077910A1 WO2022077910A1 PCT/CN2021/095525 CN2021095525W WO2022077910A1 WO 2022077910 A1 WO2022077910 A1 WO 2022077910A1 CN 2021095525 W CN2021095525 W CN 2021095525W WO 2022077910 A1 WO2022077910 A1 WO 2022077910A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- needle
- push rod
- rear end
- inner tube
- Prior art date
Links
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Images
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
- A61M5/31—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
- A61M5/3202—Devices for protection of the needle before use, e.g. caps
- A61M5/3204—Needle cap remover, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices
-
- 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
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3245—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
-
- 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
- A61M5/2033—Spring-loaded one-shot injectors with or without automatic needle insertion
-
- 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
- A61M5/3202—Devices for protection of the needle before use, e.g. caps
-
- 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
- A61M2005/2013—Having specific accessories triggering of discharging means by contact of injector with patient body
-
- 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
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
- A61M2005/3247—Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
-
- 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
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/326—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
- A61M2005/3267—Biased sleeves where the needle is uncovered by insertion of the needle into a patient's body
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- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/58—Means for facilitating use, e.g. by people with impaired vision
- A61M2205/581—Means for facilitating use, e.g. by people with impaired vision by audible feedback
Definitions
- the invention relates to the technical field of medical instruments, in particular to an automatic injector.
- An auto-injector is a medical device that can automatically inject a liquid drug in a prefilled syringe into a patient's body, which can meet the needs of users for self-administration.
- Auto-injector is a kind of medical device used by patients. Since the general patient is not a professional medical staff, the auto-injector is usually required to be easy to use, high reliability, comfortable experience, etc., and can send a prompt signal after the injection is completed. to help prompt the user to confirm that the injection is complete.
- the puncture and injection are generally achieved by simply pressing the front end of the syringe against the site to be injected and requiring the rear end of the syringe to be moved by hand.
- the activation part on the auto-injector is pressed to activate the auto-injector, the needle can quickly pierce the skin, and the drug is automatically injected through the needle.
- the existing auto-injector has a complex structure and a large number of internal parts, which is easy to cause product function failure, resulting in poor product reliability, and many product processing and assembly procedures, resulting in high product cost.
- the purpose of the present invention is to provide an automatic injector with simple structure, high reliability, easy product assembly and low cost.
- the present invention provides the following technical solutions:
- An automatic injector comprising: a casing, a needle guard, a push rod, a sounding cylinder, an inner tube, a release ring, a driving elastic member, and a reset elastic member;
- the casing is provided with a needle cylinder fixing structure for fixing the needle cylinder, and the front end of the casing is provided with an opening for the needle to extend;
- the inner side of the housing is provided with the release ring and the needle guard slidably in sequence from the rear end to the front end, and the needle guard can protrude from the front end of the housing and can be backward relative to the housing
- the end slides and pushes the release ring, the reset elastic piece acts on the release ring and drives the release ring to push the needle guard to slide toward the front end of the housing;
- a needle guard limiting structure for the forward sliding distance of the needle guard relative to the housing;
- the push rod is slidably arranged inside the housing along the axial direction, and the front end of the push rod is used to push the piston in the needle cylinder, and the driving elastic member acts on the push rod and drives the push rod.
- the rod slides toward the front end of the needle cylinder, and the outer periphery of the push rod is provided with a push rod limit structure;
- the ratchet is axially slidably sleeved on the outer circumference of the push rod, and the driving elastic piece acts on the rattle and drives the rattle to slide toward the rear end of the housing.
- a push rod limit matching structure and a sound barrel limit structure is arranged between the sound barrel and the inner tube;
- the inner tube is fixed inside the casing and is sleeved on the outer circumference of the sound barrel, the release ring is slidably sleeved on the outer circumference of the inner tube, and the inner tube is provided with a radially elastically movable a first clip, which is displaced radially outward under the action of its own elastic force;
- the first clip can be displaced radially inwardly under the limiting action of the inner wall of the release ring, and is mutually clamped and limited by the push rod limit matching structure and the push rod limit structure,
- the clapboard limiting structure can limit the relative sliding of the clapboard and the inner tube under the support of the outer wall of the push rod, and the push rod can be disengaged from the push rod after sliding a preset distance to the front end.
- the support of the limit structure of the rattle can be displaced radially inwardly under the limiting action of the inner wall of the release ring, and is mutually clamped and limited by the push rod limit matching structure and the push rod limit structure,
- the clapboard limiting structure can limit the relative sliding of the clapboard and the inner tube under the support of the outer wall of the push rod, and the push rod can be disengaged from the push rod after sliding a preset distance to the front end.
- the support of the limit structure of the rattle can be displaced radially inward
- the rear end of the casing is provided with a signal structure for impacting and limiting the position of the sound barrel.
- the signal structure is an end plate fixed to the rear end of the housing.
- a needle cap is also included, and the needle cap is detachably connected to the front end of the needle guard.
- the rear end of the needle cap is provided with a hook claw for mutually engaging with the rear end of the needle sheath, and the hook claw can exert a pulling force in the direction of the front end of the needle sheath.
- an anti-separation concave-convex matching structure is provided between the inner ring of the needle cap and the circumferential direction of the needle guard.
- a needle cap limiting structure for restricting the movement of the needle cap in the rearward direction relative to the housing is provided between the housing and the needle cap.
- the needle cylinder fixing structure is a needle cylinder fixing cylinder fixed on the inner side of the housing, and the front end of the needle cylinder fixing cylinder is provided with a needle cylinder clip for limit matching with the front end shoulder of the needle cylinder claw.
- the rear end of the syringe fixing barrel is provided with a support body for cooperating with the rear end flange of the syringe barrel, and the support body is connected to the front end surface of the rear end flange of the syringe barrel.
- the front end of the inner tube abuts against the rear end surface of the rear end flange of the syringe, and the rear end of the inner tube abuts against the rear end of the housing.
- the rear end of the housing is provided with an annular protrusion coaxially cooperating with the rear end of the inner tube, and a side wall of the housing and the inner tube is provided with an annular protrusion for preventing the inner tube Rotation limit structure for tube rotation.
- the push rod limit matching structure is a squeak avoidance notch formed on the side wall of the squeak, and the squeak avoidance notch is arranged along the axial direction of the squeak.
- the rattle tube limiting structure includes a rattle tube protrusion disposed on the outer wall of the rattle tube, and an inner tube clamping hole opened on the inner tube and used for limit clamping with the rattle tube protrusion .
- the inner tube is provided with an inner tube avoidance slot extending in the axial direction
- the release ring is provided with a second clip that is slidably matched with the inner tube avoidance slot, and the second clip can Interacting with the ratchet
- the outer side of the rattle is provided with a clip limiting structure for restricting the movement of the second clip toward the rear end of the housing.
- the push rod is a hollow rod-shaped structure
- the driving elastic member is a push rod spring arranged inside the push rod, and the push rod spring is compressed and arranged at the front end of the push rod and the ring. between the rear ends of the barrel.
- a spring guide rod is slidably arranged inside the push rod, and the push rod spring is sleeved on the outer circumference of the spring guide rod.
- the return elastic member is a return spring, and the return spring is compressed and arranged between the release ring and the housing.
- the casing includes a front casing and a rear casing, and the front casing is connected to the front end of the rear casing.
- both the housing and the needle guard are provided with observation windows extending in the axial direction.
- the needle guard limiting structure includes a first limiting step provided on the inner wall of the housing and a second limiting step provided on the outer wall of the needle guard.
- the inside of the housing of the automatic injector can be pre-installed and fixed with a pre-filled syringe, the needle is arranged toward the front end opening of the housing, and the needle can be protected by a needle sheath.
- the needle shield protrudes from the housing. The front end of the body and can protect the needle and needle sheath.
- the first clip of the inner tube is released from the limit of the inner wall of the release ring, thereby releasing the clip limit of the push rod, and the push rod moves downward under the action of the driving elastic member
- the front end of the syringe slides, and the liquid in the syringe is injected into the body through the needle through the piston, thereby realizing automatic injection.
- the outer wall of the push rod can provide continuous support to the squeezing cylinder limiting structure, thereby ensuring that the positions of the squeezing cylinder and the inner tube are relatively fixed; and when the push rod slides a preset distance, that is, the push rod After the pre-set amount of liquid in the syringe is injected, the ringing cylinder limiting structure is separated from the support of the outer wall of the push rod, so that the ringing cylinder can slide to the rear end of the housing under the action of the driving elastic member.
- the sounding cylinder can prompt the user to complete the injection by sounding, illuminating, impacting and vibrating. The user simply pulls the needle out of the body to complete the entire injection process.
- the automatic injector provided by this scheme can realize the automatic injection function of the prefilled syringe through eight parts. Compared with the automatic injector in the prior art, this scheme has a simple structure and a small number of parts;
- FIG. 1 is a schematic diagram of the overall external structure of an automatic injector in a specific embodiment of the present invention
- Fig. 2 is the first internal structure schematic diagram of the automatic injector in the specific embodiment of the present invention.
- Fig. 3 is the second internal structure schematic diagram of the automatic injector in the specific embodiment of the present invention.
- FIG. 4 is a schematic diagram of the positional relationship between the needle cap, the needle cylinder and the needle sheath in a specific embodiment of the present invention
- FIG. 5 is a schematic structural diagram of a needle cap in a specific embodiment of the present invention.
- FIG. 6 is a schematic diagram of the position-limiting assembly of the needle cap and the front housing in a specific embodiment of the present invention.
- FIG. 7 is a schematic diagram of the axial limit of the needle guard and the front housing in a specific embodiment of the present invention.
- FIG. 8 is a schematic diagram of the axial limit of the needle guard and the needle cap in the specific embodiment of the present invention.
- FIG. 9 is a schematic diagram of the positioning of the front housing and the shoulder of the syringe in a specific embodiment of the present invention.
- FIG. 10 is a schematic diagram of the positional relationship between the cushion block and the rear end flange in a specific embodiment of the present invention.
- FIG. 11 is a schematic diagram of the positional relationship between the cushion block and the front housing in a specific embodiment of the present invention.
- FIG. 12 is a schematic diagram of the external structure of a push rod in a specific embodiment of the present invention.
- FIG. 13 is a schematic diagram of a hollow structure of a push rod in a specific embodiment of the present invention.
- FIG. 14 is a schematic diagram of the assembly structure of a push rod and a push rod spring in a specific embodiment of the present invention.
- 15 is a schematic diagram of the external structure of the rattle in a specific embodiment of the present invention.
- 16 is a schematic diagram of the internal structure of the assembly of the rattle cylinder and the push rod in a specific embodiment of the present invention.
- 17 is a schematic diagram of the external structure of the assembly of the rattle cylinder and the push rod in a specific embodiment of the present invention.
- FIG. 18 is a schematic diagram of the external structure of the inner tube in a specific embodiment of the present invention.
- 19 is a schematic diagram of the assembly structure of the inner tube, the sounding cylinder and the push rod in a specific embodiment of the present invention.
- Figure 20 is a schematic diagram of the internal structure of the inner tube, the sound cylinder, and the push rod assembled in a specific embodiment of the present invention
- 21 is a schematic diagram of the positional relationship between the inner pipe and the rear end flange in a specific embodiment of the present invention.
- 22 is a schematic diagram of the axial limit of the inner tube and the push rod in a specific embodiment of the present invention.
- FIG. 23 is a schematic diagram of the external structure of the release ring in a specific embodiment of the present invention.
- 24 is a schematic diagram of the internal structure of the release ring, the inner tube, and the push rod assembled in a specific embodiment of the present invention
- 25 is a schematic diagram of the external structure of the release ring, the inner tube, and the push rod assembled in a specific embodiment of the present invention
- Figure 26 is a schematic diagram of the axial limit of the release ring and the rattle cylinder in a specific embodiment of the present invention.
- FIG. 27 is a schematic structural diagram of a push rod spring in a specific embodiment of the present invention.
- FIG. 29 is a schematic structural diagram of a rear casing in a specific embodiment of the present invention.
- FIG. 30 is a schematic diagram of the assembly structure of the rear casing and the inner tube in a specific embodiment of the present invention.
- FIG. 31 is a schematic structural diagram of a return spring in a specific embodiment of the present invention.
- 32 is a schematic structural diagram of the automatic injector in a specific embodiment of the present invention after the needle cap is removed;
- FIG. 33 is a schematic structural diagram of the needle tip exposed after the needle guard is retracted in a specific embodiment of the present invention.
- Figure 34 is a first longitudinal cross-sectional schematic diagram of the automatic injector in use in a specific embodiment of the present invention.
- Figure 35 is a second longitudinal cross-sectional schematic diagram of the automatic injector in use in a specific embodiment of the present invention.
- Fig. 36 is the third longitudinal cross-sectional schematic diagram of the automatic injector in the specific embodiment of the present invention during use;
- Fig. 37 is the fourth longitudinal cross-sectional schematic diagram of the automatic injector in the specific embodiment of the present invention during use;
- Fig. 38 is the fifth longitudinal cross-sectional schematic diagram of the automatic injector in the specific embodiment of the present invention during use;
- Fig. 39 is the sixth longitudinal cross-sectional schematic diagram of the automatic injector in use in the specific embodiment of the present invention.
- FIG. 40 is a schematic longitudinal cross-sectional view of the automatic injector in a specific embodiment of the present invention after use;
- FIG. 41 is an enlarged view of a partial longitudinal section of the automatic injector in the specific embodiment of the present invention after use.
- the present invention provides an automatic injector, including: a housing 1, a needle guard 2, a push rod 3, a rattle 4, an inner tube 5, a release ring 6, a driving elastic member, and a reset elastic member pieces.
- the auto-injector can pre-assemble the pre-filled syringe 9 into the housing 1 during assembly, and then leave the factory as a syringe containing a pre-filled syringe.
- the housing 1 is the main support and protection component of the entire automatic injector, used to fix components such as the syringe 9, the inner tube 5, etc., and also provide space for other components to install and act.
- the housing 1 can be designed as shown in the figure.
- the hollow cylindrical structure shown in Figure 1 can also be designed with an ergonomic adaptation structure on the outside of the housing 1 that is more convenient for human hands to hold. The user holds the housing 1 for pressing operations during injection.
- the casing 1 is provided with a needle cylinder fixing structure for fixing the needle cylinder 9, and the front end of the casing 1 is provided with an opening for the needle head 91 to extend; the inner side of the casing 1 is sequentially slidable from the rear end to the front end.
- Needle guard 2 the needle guard 2 can protrude from the front end of the housing 1 and can slide to the rear end relative to the housing 1 and push the release ring 6, the reset elastic piece acts on the release ring 6 and drives the release ring 6 to push the needle guard
- the cover 2 slides toward the front end of the housing 1 ;
- the housing 1 is provided with a needle guard limiting structure for limiting the forward sliding distance of the needle guard 2 relative to the housing 1 .
- the limiting structure of the needle guard includes a first limiting step 111 provided on the inner wall of the housing 1 and a second limiting step 22 provided on the outer wall of the needle guard 2. As shown in FIG. 7, the needle guard is limited The structure is used to prevent the needle guard 2 from coming out of the housing 1 .
- the limiting structure of the needle guard can also be designed in other shapes.
- the inner wall of the front part of the housing 1 is designed to be a tapered inner wall that gradually decreases from the rear end to the front end, and the outer wall of the needle guard 2 is designed to match the inner wall.
- the matching tapered outer wall can prevent the needle guard 2 from coming out; or a limit stop pin and other structures are designed between the needle guard 2 and the inner wall of the housing 1, which can also play a limiting role.
- the front end mentioned in this solution refers to the end of the automatic injector that is injected toward the human body when in use, that is, the end of the automatic injector that extends out of the needle 91 , when the automatic injector does not contain the syringe 9 and the needle 91 , the front end refers to the end of the needle guard 2 protruding from the housing 1 ; the rear end in this solution is opposite to the aforementioned front end, that is, the other end of the automatic injector that is opposite to the front end.
- the push rod 3 is the main component used to directly push the piston 93 to realize automatic injection.
- the push rod 3 is slidably arranged inside the housing 1 along the axial direction, and the front end of the push rod 3 is used to push the piston 93 in the syringe 9 to drive the
- the elastic piece acts on the push rod 3 and drives the push rod 3 to slide toward the front end of the syringe 9, so that the push rod 3 can automatically complete the injection action under the elastic force of the driving elastic piece, and the driving elastic piece and the push rod 3 can be connected to other components. It is kept in the initial assembled state under the limiting action of the cylinder 9 to avoid the liquid medicine in the syringe 9 being pushed out by the push rod 3.
- the outer periphery of the push rod 3 is provided with a push rod limit structure, and the push rod limit structure is used to interact with other components. act to keep the push rod 3 in the initial assembled state.
- the rattle 4 is the main action component that sends out a prompt signal after the push rod 3 is injected.
- the rattle 4 is sleeved on the outer periphery of the push rod 3 along the axial direction, and the driving elastic piece acts on the rattle 4 and drives the rattle 4 to the shell.
- the rear end of the body 1 slides, so that the rattle 4 can realize the function of signal prompting under the action of the elastic force of the driving elastic member, and the driving elastic member and the rattle 4 can be kept in the initial assembled state under the restriction of other components to avoid noise.
- the cylinder 4 slides to the rear end of the housing 1; the clattering cylinder 4 is provided with a push rod limit matching structure; the clattering cylinder 4 and the inner pipe 5 are provided with a clattering cylinder limiting structure, which is used to keep the clattering cylinder in the initial assembly state The relative position between 4 and the inner tube 5 is fixed.
- the push rod 3 in the present invention can be designed as a solid or hollow rod-shaped structure, or a tubular structure, etc.;
- the driving elastic member can be a coil spring, elastic rope, metal shrapnel, etc.
- the push rod 3 is a hollow rod-shaped structure, and the driving elastic member is a push rod spring 7 arranged inside the push rod 3 . Since the push rod spring 7 is in a compressed state, the push rod 3 can be pressurized toward the front end of the housing 1 , and at the same time, a pressure toward the rear end of the housing 1 can be exerted on the rattle 4 .
- the push rod 3 will move to the front end of the housing 1 under the elastic force of the push rod spring 7, and push the piston 93 for injection;
- the cylinder 4 will move towards the rear end of the housing 1 under the elastic force of the push rod 7, and a prompt signal will be issued at the same time.
- a spring guide rod 71 is slidably disposed inside the push rod 3 , the push rod spring 7 is sleeved on the outer circumference of the spring guide rod 71 , and the rear end of the push rod spring 7 abuts against the guide rod end of the rear end of the spring guide rod 71 . 711, the front end of the push rod spring 7 is in contact with the front end of the push rod 3, and the spring guide rod 71 acts as a guide for the push rod spring 7. Therefore, the push rod spring 7 can follow the spring guide during the compression, reset and release process.
- the rod 71 performs telescopic motion, thereby reducing the twist amount of the push rod spring 7 and ensuring the smooth expansion and contraction of the push rod spring 7 .
- the inner tube 5 is a tubular part fixed in position relative to the housing 1 , which can provide guidance for the axial movement of the rattle tube 4 .
- the inner tube 5 can act together with the release ring 6 in the initial assembly state to fix the push rod 3 and the rattle 4, and can release the push rod 3 after the release ring 6 moves to the rear end, so as to realize the automatic injection function of the push rod 3 .
- the inner tube 5 is fixed inside the housing 1 and is sleeved on the outer circumference of the rattle 4, the release ring 6 is slidably sleeved on the outer circumference of the inner tube 5, and the inner tube 5 is provided with a first clip 55 that can elastically move in the radial direction, The first clip 55 is deflected radially outward under the action of its own elastic force, so that the first clip 55 can release the axial fixation of the push rod 3 in time after losing the limiting effect of the release ring 6, thereby realizing Automatic injection.
- the release ring 6 When the auto-injector is in the initial assembled state, that is, the state before injection, the release ring 6 is in a position that can press the first clip 55 radially toward the ratchet 4 and the push rod 3, that is, the first clip 55 Under the limiting action of the inner wall of the release ring 6, it can be displaced radially inward, and the push rod 3 can be clamped and limited by the push rod limit matching structure and the push rod limit structure, so that the push rod 3 can be fixed by the first clip 55. to avoid axial movement of the push rod 3 before injection.
- the push rod limit structure can be designed as a pit structure, a groove structure or a sawtooth structure that can limit the axial position with the first clip 55, etc.
- the push rod limit structure in this solution is designed to surround The push rod ring groove 31 provided on the outer circumference of the push rod 3 is shown in FIG. 12 to FIG. 14 .
- the push rod limiting structure is used to provide an avoidance space for the snap fit between the first clip 55 and the push rod limiting structure, or to transmit the clamping force of the first clip 55 to the push rod limiting structure.
- the push rod limit matching structure is a squeak avoidance notch 42 formed on the side wall of the squeak 4, and the squeak 42 extends along the axial direction of the squeak 4, as shown in FIG. 15 and FIG. 17 .
- the rattle tube limit structure can limit the relative sliding of the rattle tube 4 and the inner tube 5 under the support of the outer wall of the push rod 3, and the push rod 3 can be separated from the limit structure of the rattle tube after sliding a preset distance to the front end. support, so that the push rod 3 can release the axial fixation of the sounding cylinder 4 after the injection of the preset amount of medicinal liquid or the injection is completed, so that the driving elastic member can push the sounding cylinder 4 to the rear end of the housing 1, and at the same time Send an alert signal.
- the clattering tube limiting structure can be designed in the form of a pin, a bump, a sawtooth, etc.
- the clattering cylinder limiting structure in this solution includes a clattering cylinder bump 41 arranged on the outer wall of the clattering cylinder 4 and an inner tube
- the inner tube clamping hole 53 on the 5 is used to limit the clamping connection with the sounding cylinder protrusion 41, as shown in FIG. 15 to FIG. 19 .
- the ratchet 4 can be moved to the rear end of the housing 1 under the driving of the driving elastic member by releasing the support for the limiting structure of the rattle.
- different types of prompt signals can be issued in various ways to remind the user that the injection is completed.
- a sound prompt signal can be sent out through the mutual collision between the rattle 4 and a structure in the rear end direction of the housing 1; A through hole is opened at the rear end of the shell 1 and the rattle 4 can slide out of the through hole, so that the user's hand can be hit and a tactile reminder signal is generated; or a buzzer or a prompt can be triggered when the ratchet 4 slides to a certain position lights, so as to achieve sound or light prompts, and so on.
- a voice prompt is used to remind the user that the injection is completed.
- the signal structure may be an end plate structure at the rear end of the casing 1 , or a press sounding structure disposed at the rear end of the casing 1 , or a metal sheet, or the like.
- the signal structure in this solution is the end plate 120 fixed to the rear end of the housing 1, as shown in Figures 29 and 30, after the injection of the push rod 3 is completed, the rattle 4 hits the end plate 120 backwards, At the same time, an impact sound is emitted to remind the user.
- the end plate 120 is designed as a structure with relatively high rigidity, such as a glass plate, a resin plate, a metal plate, etc., or the end plate 120 and the sound barrel 4 are on the opposite side It is designed with a metal sheet or glass sheet with high rigidity, so that when the two collide with each other, a clear and easy-to-recognize prompt sound signal can be issued.
- the needle 91 in the automatic injector containing the pre-filled syringe 9 in the initial assembly state, in order to protect the needle 91 from external pollution, the needle 91 can be protected by the needle sheath 92 that comes with the syringe 9, and the needle 91 can be protected.
- the needle sheath 92 and the needle 91 can be secondary protected by designing other protective structures at the front end of the automatic injector.
- the protective structure can also limit and protect the above-mentioned needle guard 2 to avoid accidental triggering of the automatic injection function.
- the automatic injector provided in this solution further includes a needle cap 14 , and the needle cap 14 is detachably connected to the front end of the needle guard 2 . Before injection is required, the user can manually pull out the needle cap 14 , so that the needle guard 2 can move toward the rear end of the housing 1 under a pressing action and expose the needle 91 or the needle sheath 92 .
- the rear end of the needle cap 14 is provided with a hook 143 for mutually engaging with the rear end of the needle sheath 92 , and the hook 143 can exert a pulling force on the needle sheath 92 towards the front end. As shown in FIGS.
- the needle cap 14 has a cylindrical structure as a whole, and the inner side of the needle cap 14 is provided with a needle cap inner cylinder 145 , and the inner circle of the needle cap inner cylinder 145 forms a needle for accommodating the needle sheath 92
- the sheath mounting hole 141, the front end of the needle cap inner cylinder 145 and the front end of the needle cap outer cylinder are fixedly connected or designed as an integral structure, the rear end of the needle cap inner cylinder 145 is provided with one or more pairs of hook claws 143, the hook claws 143 are The elastic hook-like structure extends from the side wall of the needle cap inner cylinder 143 to the inside of the needle sheath mounting hole 141.
- the rear of the hook 143 is installed.
- the end surface is designed as a guiding slope gradually approaching the center of the inner barrel 145 of the needle cap from back to front, as shown in FIG. 4 and FIG. 5 .
- the hook 143 can be clamped into the rear end face of the needle sheath 92 from the front end to the rear end.
- the hook 143 can be used to apply a pulling force to the needle sheath 92, thereby The needle sheath 92 is released from the needle 91 .
- the hook claws 143 extend inward and toward the front end of the needle cap 14 , so that the needle sheath 92 can be hooked more firmly and the needle sheath 92 can be effectively removed.
- a space for inserting the front end of the needle guard 2 is reserved between the outer cylinder of the needle cap 14 and the inner cylinder 145 of the needle cap.
- the inner ring of the needle cap 14 and the circumferential direction of the needle guard 2 are provided with an anti-removal concave-convex matching structure, which can prevent the needle cap 14 from accidentally detaching from the housing 1 or the needle guard before using the syringe.
- an anti-separation concave-convex matching structure is provided between the inner wall of the outer cylinder of the needle cap 14 and the outer wall of the needle guard 2 .
- the two can be interchanged, that is, the needle cap anti-disconnection limiting portion 142 is a concave structure, and the needle guard anti-disconnection limiting portion 21 is a convex structure, which can also play the role of preventing and limiting the position.
- the anti-falling concave-convex matching structure can also be arranged between the inner cylinder 145 of the needle cap and the needle guard 2 , which will not be repeated herein.
- a needle cap limiting structure 144 is provided between the housing 1 and the needle cap 14 for restricting the movement of the needle cap 14 in the rearward direction relative to the housing 1 .
- the needle cap limiting structure 144 is specifically designed as a convex structure fixed to the rear end of the outer cylinder of the needle cap 14 , and the front end of the housing 1 is designed with a groove structure matched with it.
- the needle cap limiting structure 144 cooperates with the groove structure, which can not only restrict the movement of the needle cap 14 to the rear end relative to the housing 1, but also restrict the rotation of the needle cap 14 relative to the housing 1 in the circumferential direction.
- the needle cylinder fixing structure is a needle cylinder fixing cylinder 110 fixed on the inner side of the housing 1 , and the front end of the needle cylinder fixing cylinder 110 is provided with a needle for limit matching with the front end shoulder of the needle cylinder 9
- the barrel clamp 112, the main body of the syringe 9 is accommodated in the inside of the syringe fixing barrel 110, and the front shoulder of the syringe 9 abuts against the syringe clamp 112.
- the syringe 9 can be stably fixed to the syringe
- the fixed cylinder 110 does not shake, and also prevents the rear end flange 94 of the needle cylinder 9 from breaking so that the needle cylinder 9 is pressed out of the housing 1 .
- the syringe fixing structure in the present invention can also be designed as a syringe fixing ring fixed on the inner side of the housing 1 or a syringe fixing step and other structures, which will not be described in detail herein.
- the rear end of the needle cylinder fixing cylinder 110 is provided with a support body 114 for cooperating with the rear end flange 94 of the needle cylinder 9 in a limited position.
- An elastic spacer 113 is provided between the front end surfaces of the end flanges 94 . Its main function is to provide an elastic support for the needle barrel 9 during the injection process, so as to avoid the bursting of the glass needle barrel 9 due to the excessive thrust released instantaneously.
- the front end of the inner tube 5 abuts against the rear end surface of the rear end flange 94 of the syringe 9 , and the rear end of the inner tube 5 abuts against the rear end of the housing 1 .
- the inner tube 5 is fixed inside the housing 1 through the abutting action of both ends, and provides stable support for the syringe 9 .
- the front end 52 of the inner tube of the inner tube 5 is in contact with the rear end flange 94 of the syringe 9, and the front end 52 of the inner tube can be designed as an elastic support foot structure, and the front end of the inner tube can be designed as an elastic support foot structure.
- the rear end of the housing 1 is provided with an annular protrusion 121 coaxially cooperating with the rear end of the inner tube 5 , and between the side wall of the housing 1 and the inner tube 5 is provided a rotation for preventing the inner tube 5 from rotating Limit structure.
- the annular protrusion 121 is used to ensure that the inner tube 5 does not shake in the casing 1, thereby providing a stable sliding support for the release ring 6 and the rattle 4 and other components, and can also be used to ensure that the inner tube 5 and the casing
- the rotation limiting structure ensures that the inner tube 5 will not rotate relative to the casing 1 .
- the rotation limit structure can be designed in various structural forms, for example, a limit block structure is arranged between the side wall of the housing 1 and the inner tube 5, or a limit groove structure is arranged, or the end section of the inner tube 5 is arranged
- the outer contour of the inner tube 5 is designed to be square, oval and other non-circular structures, and the rotation of the inner tube 5 is restricted by the shape fit, and so on.
- an inner tube anti-rotation limiting groove 122 is designed on the inner wall of the housing 1, which can be specifically designed as a T-shaped notch groove, and the front end of the inner tube 5 is designed with a corresponding inner tube anti-rotation protrusion. 51, as shown in Figures 29 and 30.
- the housing 1 of the automatic injector provided by the present invention can be designed as an integral structure, or can be designed as a split structure, for example, it is divided into two or more sections of cylindrical structure, preferably, as shown in FIG. 1, the shell
- the body 1 includes a front case 11 and a rear case 12 , and the front case 11 is connected to the front end of the rear case 12 .
- the front housing 11 mainly provides installation support for the pre-filled syringe 9 and ensures that the needle guard 2 maintains stable axial movement
- the rear housing 12 mainly provides installation space for other components such as the inner tube 5 and the reset elastic member.
- the front casing 11 and the rear casing 12 can be connected and fixed in various ways, such as screw connection, snap connection, etc.
- a rear casing installation ring groove 123 is designed at the front end of the rear casing 12 , used to connect and fix the front housing 11, as shown in Figure 29.
- the housing 1 is of a split design, and the syringe assembly manufacturer assembles the pre-filled syringe 9 into the housing 1, and then assembles the front housing 11 and the front housing 11.
- the rear casing 12 is connected and fixed.
- the solution also designs a tamper-proof structure at the connection between the front casing 11 and the rear casing 12, for example, by using an adhesive fixing method or an interference fit method. Or the connection between the two is designed as a one-time connection structure that is easily broken, and cannot be connected again after being disassembled, and so on.
- both the housing 1 and the needle guard 2 are provided with an observation window 13 extending in the axial direction, that is, opened on the side walls of the housing 1 and the needle guard 2 cutout opening.
- the observation window 13 can also be designed as a transparent cover structure, or the parts located on the outer periphery of the syringe 9 such as the housing 1, the needle guard 2, and the syringe 9 itself can be designed as transparent structures, which can also be easily used. Observe the injection situation.
- the release ring 6 is a sliding part with a cylindrical structure, and its main function is to limit the first clip 55 of the inner tube 5 to bounce outwards in the initial assembly state, so as to ensure that the push rod 3 is fixed before injection. After the 6 moves toward the rear end of the housing 1 and the release ring 6 releases the radial restriction on the first clip 55, the first clip 55 can release the axial restriction on the push rod 3. Therefore, the push rod 3 can be released.
- the automatic injection is realized under the action of the push rod spring 7 .
- Another function of the release ring 6 is to interact with the ratchet 4 after the injection is completed and return to the initial axial position, thereby ensuring that the syringe will not be reused.
- the needle guard 2 drives the release ring 6 to overcome the elastic force of the reset elastic member together, so that the release ring 6 slides toward the rear end of the housing 1.
- the inner tube 5 is provided with an inner tube avoidance slot 54 extending along the axial direction
- the release ring 6 is provided with a second clip 62 slidably matched with the inner tube avoidance slot 54 , and the second clip 62 can interact with the rattle 4
- a clip limiting structure for restricting the movement of the second clip 62 to the rear end direction of the housing 1 is provided on the outer side of the sound barrel 4 .
- the second clip 62 can be designed as an elastic clip structure that can elastically deform in the radial direction, and the second clip 62 can interact with the rattle 4 to make the two abut or rub against each other in the axial direction Wait.
- the ratchet 4 moves to the rear end of the housing 1, and the front end of the needle guard 2 is moved away from the injection part.
- the second clip 62 of 6 moves to interact with the clip limit structure of the rattle 4, due to the axial limit effect of the clip limit structure and the second clip 62, the release ring 6 cannot move to the shell again.
- the rear end of the body 1 moves in the direction of the rear end, thus further making the automatic injector unable to perform secondary injection and ensuring the safety of use.
- the clip limit structure can be designed into various structural forms, such as a limit hole structure, a limit sawtooth structure, a limit friction surface structure, etc. 15 to 17 and FIG. 26, it can be seen from the illustration that in the initial assembly state, the clip limit opening 43 is located at the front end of the second clip 62, therefore, the clip limit opening 43 The second clip 62 cannot be axially limited. When the injection is completed (as shown in FIG. 26 ), the second clip 62 moves to the front end and is inserted into the clip limit opening 43. At this time, the clip is limited.
- a clip avoidance opening 44 is also designed on the side wall of the rattle 4, as shown in FIGS. 15 to 17 and 26, the clip The avoidance opening 44 is located in the direction of the rear end of the clip limiting opening 43 .
- the reset elastic member serves as a retaining member for keeping the release ring 6 and the needle guard 2 in the initial axial position and a restoring member for restoring the release ring 6 and the needle guard 2 to the initial axial position after the injection is completed.
- the reset elastic member can provide a continuous elastic force applied to the front end direction for the release ring 6.
- elastic parts such as coil springs, elastic ropes or metal shrapnel can be used.
- the reset elastic member is a reset spring 8, as shown in Figure 31.
- the return spring 8 is arranged in compression between the release ring 6 and the housing 1 . As shown in FIG.
- the rear end of the release ring 6 is also designed with a rear end flange 61 of the release ring for abutting with the return spring 8 , and the front end of the return spring 8 abuts against the rear end flange 61 of the release ring , the rear end of the return spring 8 is in contact with the inner wall of the rear end of the rear housing 12 , and the return spring 8 may also be in a compressed state in the initial assembled state.
- the needle cap 14, the needle guard 2, the front housing 11 and the elastic spacer 113 described above constitute the holding assembly of the front housing and are mainly used to maintain and fix the position of the needle cylinder 9;
- the push rod 3, the sounding cylinder 4, the inner tube 5, the release ring 6, the push rod spring 7, the spring guide rod 71, the return spring 8, and the rear casing 12 constitute the driving assembly of the rear casing. It is used to realize the function of driving injection.
- each part of the automatic injector of the present invention can be made of various materials (such as resin, metal, etc. commonly used in medical equipment), and can also have different specifications and structures.
- FIGS. 1 to 3 and FIGS. 32 to 41 please refer to FIGS. 1 to 3 and FIGS. 32 to 41 to introduce the complete use process of the automatic injector provided by the present invention.
- FIGS. 1 to 3 are a schematic diagram of the overall external structure and two longitudinal cross-sectional diagrams of the auto-injector before use, respectively.
- the needle cap 14 of the auto-injector is also mounted on the front end of the housing 1 .
- the front housing 11 is adapted to hold a syringe 9 containing a medicament.
- the syringe 9 may be a pre-filled syringe and has a needle 91 disposed at the front end of the syringe 9.
- the syringe 9 may be suitable for A medicament cartridge to which needle 91 is removably attached.
- the needle 91 is arranged towards the front opening of the front housing 11, and the needle 91 can be protected by a needle sheath 92.
- the needle guard 2 protrudes from the front end of the housing 1 and can protect the needle 91 and the needle sheath 92 .
- the needle cap 14 when preparing for injection, the needle cap 14 is removed to the front, and the front end of the needle guard 2 is exposed outside the housing 11, and the needle 91 is still covered by the needle guard 2. Then, hold the housing 1 and make the front end of the housing 1 align with the part of the body that needs to be injected, align the needle guard 2 with the part that needs to be injected and press it hard, at this time, the needle guard 2 shrinks to the inside of the housing 1, And the needle 91 is exposed, so that the needle 91 can pierce the site to be injected.
- the needle guard 2 When the needle guard 2 is pushed backwards, the rear end surface of the needle guard 2 will abut the front end of the release ring 6 , the needle guard 2 overcomes the elastic force of the return spring 8 and drives the release ring 6 to the rear end relative to the housing 1 . Move and compress the return spring 8 until the second clip 62 of the release ring 6 abuts against the inner tube escape slot 54 of the inner tube 5 , as shown in FIGS. 33 to 35 . At the same time, the inner ring protrusion 23 of the needle guard provided on the inner wall of the needle guard 2 will abut against the needle cylinder clamping claw 112 inside the front housing 11 to provide auxiliary support for the shoulder of the front end of the needle cylinder 9 .
- the outer wall of the push rod 3 can provide continuous support to the rattle cylinder bump 41, thereby ensuring that the positions of the rattle cylinder 4 and the inner tube 5 are relatively fixed; and when the push rod 3 slides a preset distance That is, after the push rod 3 injects the preset amount of liquid in the syringe 9 , the rattle cylinder bump 41 is separated from the support of the outer wall of the push rod 3 , so that the rattle cylinder 4 can be moved downward under the action of the push rod spring 7 .
- the rear end direction of the casing 1 slides.
- the sounding cylinder 4 can prompt the user to complete the injection through various methods such as sound, light, friction, impact and vibration.
- the inner ring-shaped protrusions 121 collide with each other to make a sound to prompt the completion of injection, as shown in FIG. 38 and FIG. 39 . The user only needs to pull out the needle 91 from the body to complete the entire injection process.
- the rattle tube 4 is axially limited by the clip limit opening 43 and cannot move backward again, as shown in Figure 40 and Figure 41, so that the protection can be locked.
- the axial position of the needle shield 2 prevents the needle 91 from being exposed, that is, prevents the automatic injector from being reused, thereby ensuring high safety in use.
- the automatic injector provided by this scheme can realize the automatic injection function of the prefilled syringe through eight parts. Compared with the automatic injector in the prior art, this scheme has a simple structure and a small number of parts;
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Abstract
Description
Claims (20)
- 一种自动注射器,其特征在于,包括:壳体(1)、护针罩(2)、推杆(3)、响筒(4)、内管(5)、释放环(6)、驱动弹性件、复位弹性件;所述壳体(1)内设有用于固定针筒(9)的针筒固定结构,所述壳体(1)的前端设有供针头(91)伸出的开口;所述壳体(1)内侧由后端至前端方向依次滑动设置有所述释放环(6)和所述护针罩(2),所述护针罩(2)能够伸出于所述壳体(1)的前端且能够相对所述壳体(1)向后端滑动并推动所述释放环(6),所述复位弹性件作用于所述释放环(6)并驱使所述释放环(6)推动所述护针罩(2)向所述壳体(1)的前端滑动;所述壳体(1)设置有用于限定所述护针罩(2)相对所述壳体(1)向前的滑动距离的护针罩限位结构;所述推杆(3)沿轴向滑动设置于所述壳体(1)内部,且所述推杆(3)的前端用于推动所述针筒(9)内的活塞(93),所述驱动弹性件作用于所述推杆(3)并驱使所述推杆(3)向所述针筒(9)的前端滑动,所述推杆(3)的外周设有推杆限位结构;所述响筒(4)沿轴向滑动套设于所述推杆(3)的外周,所述驱动弹性件作用于所述响筒(4)并驱使所述响筒(4)向所述壳体(1)的后端滑动,所述响筒(4)设有推杆限位配合结构,所述响筒(4)与所述内管(5)之间设有响筒限位结构;所述内管(5)固定于所述壳体(1)内部并且套设于所述响筒(4)的外周,所述释放环(6)滑动套设于所述内管(5)的外周,所述内管(5)设有能够沿径向弹性移动的第一卡夹(55),所述第一卡夹(55)在自身弹力作用下沿径向向外偏移;所述第一卡夹(55)能够在所述释放环(6)的内壁的限位作用下沿径向向内偏移并通过所述推杆限位配合结构与所述推杆限位结构相互卡接限位,所述响筒限位结构能够在所述推杆(3)的外壁的支撑作用下限制所述响筒(4)与所述内管(5)的相对滑动,所述推杆(3)能够在向前端滑动预设距离后脱离对所述响筒限位结构的支撑。
- 根据权利要求1所述的自动注射器,其特征在于,所述壳体(1)的后 端设有用于与所述响筒(4)撞击限位的信号结构。
- 根据权利要求2所述的自动注射器,其特征在于,所述信号结构为固定于所述壳体(1)的后端的端板(120)。
- 根据权利要求1所述的自动注射器,其特征在于,还包括针帽(14),所述针帽(14)可拆卸地连接于所述护针罩(2)的前端。
- 根据权利要求4所述的自动注射器,其特征在于,所述针帽(14)的后端设有用于与针鞘(92)的后端相互卡接的勾爪(143),所述勾爪(143)能够对所述针鞘(92)施加向前端方向的拉力作用。
- 根据权利要求4所述的自动注射器,其特征在于,所述针帽(14)的内圈与所述护针罩(2)的周向之间设有防脱凹凸配合结构。
- 根据权利要求4所述的自动注射器,其特征在于,所述壳体(1)与所述针帽(14)之间设有用于限制所述针帽(14)相对所述壳体(1)向后端方向移动的针帽限位结构(144)。
- 根据权利要求1所述的自动注射器,其特征在于,所述针筒固定结构为固定于所述壳体(1)内侧的针筒固定筒(110),所述针筒固定筒(110)的前端设有用于与所述针筒(9)的前端肩部限位配合的针筒夹爪(112)。
- 根据权利要求8所述的自动注射器,其特征在于,所述针筒固定筒(110)的后端设有用于与所述针筒(9)的后端法兰(94)限位配合的支撑体(114),所述支撑体(114)与所述针筒(9)的所述后端法兰(94)的前端面之间设有弹性垫块(113)。
- 根据权利要求1所述的自动注射器,其特征在于,所述内管(5)的前端抵接于所述针筒(9)的后端法兰(94)的后端面,所述内管(5)的后端抵接于所述壳体(1)的后端。
- 根据权利要求10所述的自动注射器,其特征在于,所述壳体(1)的后端设有与所述内管(5)的后端同轴配合的环状凸起(121),所述壳体(1)的侧壁与所述内管(5)之间设有用于防止所述内管(5)旋转的旋转限位结构。
- 根据权利要求1所述的自动注射器,其特征在于,所述推杆限位配合结构为开设于所述响筒(4)的侧壁上的响筒避让缺口(42),所述响筒避让缺口(42)沿所述响筒(4)的轴向延伸布置。
- 根据权利要求1所述的自动注射器,其特征在于,所述响筒限位结构包括设置于所述响筒(4)外壁的响筒凸块(41)以及开设于所述内管(5)上 的用于与所述响筒凸块(41)限位卡接的内管卡孔(53)。
- 根据权利要求1所述的自动注射器,其特征在于,所述内管(5)设有沿轴向延伸的内管避让槽孔(54),所述释放环(6)设有与所述内管避让槽孔(54)滑动配合的第二卡夹(62),且所述第二卡夹(62)能够与所述响筒(4)相互作用,所述响筒(4)的外侧设有用于限制所述第二卡夹(62)向所述壳体(1)的后端方向移动的卡夹限位结构。
- 根据权利要求1所述的自动注射器,其特征在于,所述推杆(3)为中空的杆状结构,所述驱动弹性件为设置于所述推杆(3)内部的推杆弹簧(7),所述推杆弹簧(7)压缩布置于所述推杆(3)的前端和所述响筒(4)的后端之间。
- 根据权利要求15所述的自动注射器,其特征在于,所述推杆(3)的内部滑动设置有弹簧导杆(71),所述推杆弹簧(7)套设于所述弹簧导杆(71)的外周。
- 根据权利要求1所述的自动注射器,其特征在于,所述复位弹性件为复位弹簧(8),所述复位弹簧(8)压缩布置于所述释放环(6)和所述壳体(1)之间。
- 根据权利要求1所述的自动注射器,其特征在于,所述壳体(1)包括前壳体(11)和后壳体(12),所述前壳体(11)连接于所述后壳体(12)的前端。
- 根据权利要求1所述的自动注射器,其特征在于,所述壳体(1)和所述护针罩(2)均设有沿轴向延伸的观察窗口(13)。
- 根据权利要求1所述的自动注射器,其特征在于,所述护针罩限位结构包括设置于所述壳体(1)内壁的第一限位台阶(111)和设置于所述护针罩(2)外壁的第二限位台阶(22)。
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CN202011110579.9 | 2020-10-16 | ||
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