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CN-122006018-A - Automatic injection pen

CN122006018ACN 122006018 ACN122006018 ACN 122006018ACN-122006018-A

Abstract

The application discloses an automatic injection pen which comprises a shell, an injection assembly, a trigger assembly and an injector, wherein the injection assembly is arranged at one end in the shell and comprises a safety top cap, a push rod fixing piece, a push rod arranged in the push rod fixing piece, a trigger retaining piece sleeved outside the push rod fixing piece, a blocking piece fixedly arranged in the shell and an injection spring abutted between the blocking piece and the push rod, the trigger assembly is arranged at the other end in the shell and comprises a needle point protective sleeve, a pen core frame fixedly arranged in the shell and a trigger spring abutted between the pen core frame and the needle point protective sleeve, the injector is arranged between the injection assembly and the trigger assembly, the injector is arranged in the pen core frame, one end of the push rod is arranged in one end of the injector, the trigger retaining piece is fixedly connected with the needle point protective sleeve, and the blocking piece is fixedly connected with the push rod fixing piece. The automatic injection pen can realize the reliable linkage in the process of preventing false triggering before use and safe locking of the needle after injection.

Inventors

  • Request for anonymity
  • Request for anonymity

Assignees

  • 江苏英捷信医疗科技有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (10)

  1. 1. An automatic injection pen, comprising: A housing (7); The injection assembly (1300) is arranged at one end in the shell (7), and the injection assembly (1300) comprises a safety top cap (1), a push rod fixing piece (5), a push rod (6) arranged in the push rod fixing piece (5), a trigger retaining piece (3) sleeved outside the push rod fixing piece (5), a blocking piece (2) fixedly arranged in the shell (7) and an injection spring (4) abutted between the blocking piece (2) and the push rod (6); The trigger assembly (1400) is arranged at the other end in the shell (7), and the trigger assembly (1400) comprises a needle tip protective sleeve (11), a pen refill frame (9) fixedly arranged in the shell (7) and a trigger spring (10) abutted between the pen refill frame (9) and the needle tip protective sleeve (11); The injector (8) is arranged between the injection assembly (1300) and the trigger assembly (1400), the injector (8) is arranged in the pen refill frame (9), one end of the push rod (6) is arranged in one end of the injector (8), the trigger retainer (3) is fixedly connected with the needle point protective sleeve (11), and the blocking piece (2) is fixedly connected with the push rod fixing piece (5); Before injection begins, the safety top cap (1) is inserted into the blocking piece (2), and the movement of the trigger retainer (3) is limited, so that the injection assembly (1300) is in a non-triggerable state; After the safety top cap (1) is pulled out of the blocking piece (2), the needle tip protective sleeve (11) drives the trigger retaining piece (3) to move so as to trigger the injection assembly (1300) to extrude the injector (8) to complete injection operation.
  2. 2. The automatic injection pen according to claim 1, characterized in that the safety cap (1) is provided with a second arm (102), the outside of the end of the second arm (102) is provided with a first protrusion (104), the blocking member (2) is provided with a first spring arm (202), the outside of the first spring arm (202) is provided with a protrusion; When the safety top cap (1) is inserted into the blocking piece (2), the second arm (102) is positioned between the first elastic arm (202) and the push rod fixing piece (5), and the first protrusion (104) supports the first elastic arm (202) outwards so that the protrusion on the outer side of the first elastic arm (202) is abutted to the top of the trigger retainer (3); When the safety helmet (1) is pulled out of the blocking piece (2), the second arm (102) is withdrawn from between the first elastic arm (202) and the push rod fixing piece (5), the first elastic arm (202) is contracted inwards, and the bulge at the outer side of the first elastic arm (202) is separated from the trigger retaining piece (3) so that the trigger retaining piece (3) can move.
  3. 3. The automatic injection pen according to claim 2, characterized in that the push rod fixing member (5) is provided with a fourth protrusion (502) on the side surface, the inner side of the end portion of the second arm (102) is provided with a first groove (103), the safety cap (1) is inserted into the blocking member (2), and the fourth protrusion (502) is matched with the first groove (103).
  4. 4. An automatic injection pen according to claim 2, characterized in that the top of the trigger holder (3) is provided with a second protrusion (301), the inside of the second protrusion (301) is provided with a chamfer, the protrusion outside the first spring arm (202) is arranged obliquely upwards and cooperates with the chamfer inside the second protrusion (301).
  5. 5. The automatic injection pen according to any one of claims 1-4, wherein a second clamping groove (302) is formed in the side surface of the trigger holder (3), a protruding step (304) is formed in the inner wall of the trigger holder (3), a spring arm clamping hook (503) and a third spring arm (504) are formed in the side surface of the push rod fixing member (5), protrusions are formed in the inner side and the outer side of the spring arm clamping hook (503), the inner side protrusions are inclined, a third clamping groove (601), a fourth clamping groove (603) located below the third clamping groove (601) and a hole (602) formed in one side of the third clamping groove (601) and the fourth clamping groove (603), the push rod fixing member (5) is sleeved on the upper portion of the push rod (6), a protrusion which is obliquely arranged downwards is formed in the outer side of the third spring arm (504), a third protrusion (305) which is obliquely arranged upwards is formed in the inner wall of the trigger holder (3), and the third protrusion (305) which is matched with the third spring arm (305) on the outer side of the trigger holder (3); Before injection starts, the protrusion on the outer side of the spring arm clamping hook (503) is matched with the protrusion step (304), the protrusion on the inner side of the spring arm clamping hook (503) is matched with the fourth clamping groove (603) so that the spring arm clamping hook (503) is fixed in the fourth clamping groove (603), and the third spring arm (504) is supported by the outer wall of the push rod (6) so that the third protrusion (305) is abutted against the protrusion on the outer side of the third spring arm (504) to limit the movement of the trigger retainer (3); In the injection process, the safety top cap (1) is pulled out, the trigger retainer (3) is driven to move upwards through the needle tip protective sleeve (11), the second clamping groove (302) is moved to the outer protruding position of the spring arm clamping hook (503), the protruding position of the outer side of the spring arm clamping hook (503) is matched with the second clamping groove (302) to enable the spring arm clamping hook (503) to expand outwards, the protruding position of the inner side of the spring arm clamping hook (503) is separated from the fourth clamping groove (603) under the action of the elastic force of the injection spring (4), and the injection spring (4) drives the push rod (6) to squeeze the injector (8) to complete injection; After the injection is finished, the hole (602) of the push rod (6) moves to a third elastic arm (504) of the push rod fixing piece (5), the third elastic arm (504) is matched with the hole (602) so that the third elastic arm (504) can shrink inwards, the needle tip protecting sleeve (11) and the trigger retaining piece (3) move downwards under the elastic force action of the trigger spring (10), the third protrusion (305) slides over the protrusion on the outer side of the third elastic arm (504) and is clamped below the protrusion on the outer side of the third elastic arm (504) so that the trigger retaining piece (3) cannot move upwards, the protrusion step (304) moves to the protrusion on the outer side of the elastic arm clamping hook (503), the protrusion on the outer side of the elastic arm clamping hook (503) is matched with the protrusion step (304) so that the elastic arm clamping hook (503) shrinks inwards, and the protrusion on the inner side of the elastic arm clamping hook (503) is matched with the third clamping groove (601) so that the elastic arm (503) is fixed in the third clamping groove (601).
  6. 6. The automatic injection pen according to claim 2, characterized in that the top end of the housing (7) is provided with a fifth clamping groove (701) and an arc-shaped groove (702) located at one side of the fifth clamping groove (701); the side surface of the blocking piece (2) is provided with a first clamping buckle (201), the fifth clamping groove (701) is matched with the first clamping buckle (201), and the first clamping buckle (201) can be clamped in the fifth clamping groove (701); The safety helmet (1) is further provided with a first arm (101), the first arm (101) is shorter than the second arm (102), the arc-shaped groove (702) is matched with the first arm (101), and the first arm (101) can extend into the arc-shaped groove (702).
  7. 7. The automatic injection pen according to claim 1, characterized in that the cartridge holder (9) is provided with a third buckle (901), a sixth clamping groove (703) is arranged on the side surface of the housing (7), the third buckle (901) is matched with the sixth clamping groove (703), and the third buckle (901) can be clamped in the sixth clamping groove (703); the bottom of the refill holder (9) is provided with axial protrusions (903), and the trigger spring (10) is sleeved outside the axial protrusions (903) and is abutted to the axial protrusions (903).
  8. 8. The automatic injection pen according to claim 1, characterized in that the tip protection sleeve (11) is provided with a third arm (1103), the third arm (1103) being provided with a seventh card slot (1101) and an eighth card slot (1102) located below the seventh card slot (1101); the side surface of the trigger retainer (3) is provided with a second spring arm (303), the seventh clamping groove (1101) is matched with the second spring arm (303), and the second spring arm (303) can be clamped in the seventh clamping groove (1101); The side of the pen refill holder (9) is provided with a fourth spring arm (902), the eighth clamping groove (1102) is matched with the fourth spring arm (902), and the fourth spring arm (902) can be clamped in the eighth clamping groove (1102).
  9. 9. The automatic injection pen according to claim 1, characterized in that the blocking member (2) is sleeved on the upper portion of the push rod fixing member (5), a first clamping groove (203) is formed in the side face of the blocking member (2), a second clamping buckle (501) is arranged on the side face of the push rod fixing member (5), the second clamping buckle (501) is matched with the first clamping groove (203), and the second clamping buckle (501) can be clamped in the first clamping groove (203).
  10. 10. The automatic injection pen according to claim 1, further comprising a cap (12), the cap (12) being mounted to the bottom of the housing (7), the bottom of the housing (7) being provided with a rotation protrusion (704), and a plug (705) located below the rotation protrusion (704); A cap column (1203) is fixedly connected to the inside of the cap (12), a plurality of barbs (1201) extending inwards are arranged on the inner wall of the cap column (1203), the barbs (1201) are matched with the syringe (8), and the barbs (1201) are used for hooking a needle tip sheath arranged at the end part of the syringe (8); The inner wall of the cap (12) is provided with a fifth protrusion (1202), the fifth protrusion (1202) is in rotary fit with the rotary protrusion (704), and the plug block (705) is matched with the fifth protrusion (1202) so that the cap (12) can be fixed at the bottom of the shell (7).

Description

Automatic injection pen Technical Field The application relates to the technical field of medical appliances, in particular to an automatic injection pen. Background In the technical field of medical appliances, an automatic injection pen is popular among a plurality of medical workers and patients because the automatic injection pen can remarkably reduce the difficulty of injection operation and the pain of the patients in the injection process, and is an important tool widely applied to drug treatment. When the existing automatic injection pen is not used, if the existing automatic injection pen is extruded or touched by external force, the injection spring is easy to release accidentally, so that medicine is wasted or accidentally injured, in the injection process, the triggering mechanism lacks clear travel locking, clamping stagnation or early reset is easy to occur, injection reliability is affected, after injection is finished, the needle protection sleeve is always unable to be locked in a protection position automatically and firmly, and the risk of needle puncture injury caused by accidental exposure of the needle exists. Therefore, there is a need for an automatic injection pen that can prevent false triggering before use, reliably link during injection, and safely lock the needle after injection. Disclosure of Invention Aiming at the potential safety hazards that the prior automatic injection pen is easy to cause accidental triggering due to misoperation before use, poor in reliability in the injection process, easy to cause needle puncture due to needle exposure after injection and the like, the application provides the automatic injection pen which systematically solves the safety problem in the whole service cycle of the automatic injection pen through multiple mechanical interlocking and sequential triggering mechanisms. Specifically, the method comprises the following technical scheme: the present application provides an automatic injection pen comprising: A housing; The injection assembly is arranged at one end in the shell and comprises a safety top cap, a push rod fixing piece, a push rod arranged in the push rod fixing piece, a trigger retaining piece sleeved outside the push rod fixing piece, a blocking piece fixedly arranged in the shell and an injection spring abutted between the blocking piece and the push rod; The trigger assembly is arranged at the other end in the shell and comprises a needle tip protective sleeve, a pen core frame fixedly arranged in the shell and a trigger spring which is abutted between the pen core frame and the needle tip protective sleeve; the injector is arranged between the injection assembly and the trigger assembly, the injector is arranged in the pen refill frame, one end of the push rod is arranged in one end of the injector, the trigger retainer is fixedly connected with the needle point protective sleeve, and the blocking piece is fixedly connected with the push rod fixing piece; Before injection begins, the safety top cap is inserted into the blocking piece, and the movement of the trigger retaining piece is limited, so that the injection assembly is in a non-triggerable state; when the safety top cap is pulled out of the blocking piece, the needle point protective sleeve drives the trigger retaining piece to move so as to trigger the injection assembly to extrude the injector to complete injection operation. In one embodiment of the application, the safety helmet is provided with a second arm, and the outer side of the end part of the second arm is provided with a first protrusion; when the safety top cap is inserted into the blocking piece, the second arm is positioned between the first elastic arm and the push rod fixing piece, and the first protrusion outwards supports the first elastic arm so that the protrusion on the outer side of the first elastic arm is abutted to the top of the trigger retaining piece; When the safety top cap is pulled out of the blocking piece, the second arm withdraws from between the first elastic arm and the push rod fixing piece, the first elastic arm is contracted inwards, and the bulge at the outer side of the first elastic arm is separated from the trigger retaining piece, so that the trigger retaining piece can move. In one embodiment of the present application, a fourth protrusion is disposed on a side of the push rod fixing member, a first groove is disposed on an inner side of the second arm end portion, the safety helmet is inserted into the blocking member, and the fourth protrusion is matched with the first groove. In one embodiment of the application, the trigger holder is provided with a second protrusion on the top, a chamfer is provided on the inner side of the second protrusion, and the protrusion on the outer side of the first spring arm is provided obliquely upwards and is matched with the chamfer on the inner side of the second protrusion. In one embodiment of the application, a second clamping groo