CN219614595U - Automatic injector - Google Patents

Abstract

The utility model relates to an automatic injector, which comprises a shell, a needle head, a needle cylinder and a push rod, wherein the needle head, the needle cylinder and the push rod are sequentially arranged in the shell from bottom to top, the needle cylinder is fixed in the shell, the push rod can move downwards, so that liquid medicine in the needle cylinder is injected out from the needle head. According to the utility model, the switch is pressed down, the driving of the motor is transmitted to the push rod through the matching of the screw and the nut, so that the push rod moves downwards, and the liquid medicine in the needle cylinder is injected, and the whole automatic injector has the advantages of simple structure, convenience in operation and reliability in operation.

Description

Automatic injector

Technical Field

The utility model relates to the field of medical instruments, in particular to an automatic injector.

Background

Syringes are a commonly used medical device for injecting medicinal fluids into the body. Most syringes are manually operated, requiring the aspiration of a drug solution, the insertion of a needle into the injection site, the pushing of the drug solution into the body, and the final withdrawal of the syringe and disposal. Such syringes often require a doctor-nurse operation with knowledge and skill of the injection, which is inconvenient for the average person to inject themselves. And sometimes occasions need to inject the injector by oneself, and the injector is not suitable. There have thus been some autoinjectors that have a button or switch that is depressed to complete an auto-injection by simply depressing the on button or switch. However, these auto-injectors are often complex in structure, inconvenient to operate, and often have problems in operation, and have poor operational reliability.

Disclosure of Invention

In order to solve the problems of the automatic injector, the utility model provides the automatic injector which has simple structure, convenient operation and reliable operation.

In order to achieve the above purpose, the automatic injector provided by the utility model comprises a shell, a needle head, a needle cylinder and a push rod, wherein the needle head, the needle cylinder and the push rod are sequentially arranged in the shell from bottom to top, the needle head is connected with the lower end of the needle cylinder, the needle cylinder is used for containing liquid medicine and is fixed in the shell, the push rod can move downwards so as to enable the liquid medicine in the needle cylinder to be injected out of the needle head.

According to the automatic injector provided by the utility model, the switch is pressed down, and the driving of the motor is transmitted to the push rod through the cooperation of the screw rod and the nut, so that the push rod moves downwards, and the liquid medicine in the needle cylinder is injected.

Further, the automatic injector further comprises a protection device, the protection device comprises an inner shrinking cylinder and a lower spring, the upper part of the inner shrinking cylinder is arranged in the shell, the lower part of the inner shrinking cylinder extends out of the shell and can move up and down relative to the shell, a cavity is formed in the inner part of the inner shrinking cylinder, the upper end of the cavity is open, the lower end of the cavity is provided with an end wall, the center of the end wall is provided with a penetrating puncture hole, the lower spring is arranged on the inner side of the inner shrinking cylinder, the lower end of the lower spring is arranged on the end wall, and the needle head is right opposite to the position of the penetrating puncture hole in the inner shrinking cylinder and penetrates through the lower spring. The needle is well protected in the retraction cylinder before injection, so that the needle is prevented from being damaged before use, and the needle is convenient to transport and store; the needle is retracted into the retraction barrel after injection, so that the injury accident caused by the discarded automatic injector after use is prevented, and the disposal of the discarded automatic injector is facilitated.

Drawings

FIG. 1 is a schematic cross-sectional view of an automatic injector according to an embodiment;

fig. 2 is a schematic cross-sectional view of a two-embodiment auto-injector.

The utility model is described in further detail below with reference to the accompanying drawings.

Detailed Description

Example 1

Referring to fig. 1, the automatic injector includes a housing, a needle 21, a barrel 22, and a plunger 4. The shell is cylindrical, and the cavity that link up from top to bottom has in the shell, and the lower extreme opening of cavity. The shell comprises an upper shell 11 and a lower shell 12, and the upper shell 11 and the lower shell 12 are connected into a whole, and are all preferably made of polycarbonate plastics. A needle 21, a syringe 22 and a push rod 4 are arranged in the cavity in the shell from bottom to top. Needle 21 is connected to the lower end of barrel 22 and its head extends beyond lower housing 12. The syringe 22 is fixedly installed in the lower housing 12 for containing the liquid medicine, and has a piston 23 provided at an upper portion thereof, which is movable up and down with respect to the syringe and is sealed with the syringe, and the liquid medicine in the syringe 22 is injected from the needle 21 by pushing the piston 23 by an external force. The structure of the needle 21 and the syringe 22 in this embodiment can be a commonly used medical injector structure, and the production cost can be reduced. The push rod 4 is cylindrical above the piston 23, and has a through hole penetrating in the axial direction in the middle.

The drive mechanism is disposed in the cavity of the upper housing 11, and includes a motor 30, a screw 32, and a nut 31, the nut 31 being mounted on the upper end of the push rod 4, and having a screw hole penetrating in the axial direction in the middle thereof. The screw 32 is engaged with the screw hole of the nut 31, and the lower end thereof extends into the through hole of the push rod 4, and the upper end thereof is connected with the rotating shaft of the motor 30. The battery 6 and the switch 7 are disposed at the upper end of the upper housing 11, and the battery 6, the switch 7 and the motor 30 are electrically connected. The upper end of the upper shell 11 is provided with an upper cover 5, a part of the switch 7 in the upper cover 5 is also arranged in the upper cover 5, the upper cover 5 has a protective effect on the battery 6 and the switch 7, and meanwhile, the product is more attractive. When the liquid medicine needs to be injected, the switch 7 is pressed down, the motor 30 is started, the motor 30 drives the screw rod 32 to rotate, the nut 31 matched with the screw rod 32 moves downwards while rotating, the push rod 4 is driven to move downwards, and the push rod 4 pushes the piston 23 to move downwards together, so that the liquid medicine in the needle cylinder 22 is injected from the needle head needle 21, and automatic injection is realized.

The protection device comprises an inner shrink cylinder 8 and a lower spring 9, wherein the inner shrink cylinder 8 is cylindrical, a cavity is formed in the inner part, the upper end of the cavity is open, the lower end of the cavity is provided with an end wall 81, and the center of the end wall 81 is provided with a penetrating puncture hole 82. The upper part of the inner shrink tube 8 is arranged in the lower shell 12, and the lower part extends out of the lower shell 12 and can move up and down relative to the lower shell 12. The lower spring 9 is inside the inner cylinder 8, the lower part is in the inner cylinder 8, the upper part is in the lower housing 12, the lower end is placed on the end wall 81 of the inner cylinder 8, and the upper end is in contact with the lower housing 12. The upper end of the lower spring 9 is pressed on the lower shell 12, so that the distance of the lower spring 9 is longer, the inner shrink tube 8 is retracted into the lower shell 12 to form larger, and the distance of the head needle 21 extending out of the inner shrink tube 8 during injection is long enough to meet the injection requirement. Needle 21 is positioned in the retraction barrel 8 opposite the puncture 82 and passes through the lower spring 9. The cavity wall of the lower shell 12 is provided with a guide groove 121 extending along the axial direction, the outer wall of the upper end of the inner telescopic cylinder 8 is provided with a protruding part 83 protruding outwards, the protruding part 83 is placed in the guide groove 121, the inner telescopic cylinder 8 can be installed on the lower shell 12 through the matching of the protruding part 83 and the guide groove 121, and the inner telescopic cylinder 8 can move up and down relative to the lower shell 12. The end wall 81 of the retraction barrel 8 is provided with a sterilizing sheet 91 having a sterilizing function, the sterilizing sheet 91 covers the puncture hole 82, and the sterilizing sheet 91 sterilizes the needle 21 when the needle 21 extends from the retraction barrel 8 through the sterilizing sheet 91. The outside of the sterilizing sheet 91 is provided with a sterilizing sheet cover 92 for fixing the sterilizing sheet 91 to the inner cylinder 8 to prevent the sterilizing sheet 91 from falling off. The sterilizing sheet cover sheet 92 is provided with a through hole at a position opposite to the puncture hole 82, the through hole leaves a space for the needle 21 to pass through, and the needle passes through the through hole when the needle is punctured, but does not puncture the sterilizing sheet cover sheet 92.

Prior to use of the automatic injector of the present utility model, needle 21 is inside retraction barrel 8 and protected by retraction barrel 8. When injection is needed, the outer end of the inner shrinking cylinder 8 is contacted with the injection site, then the outer shell is pushed to the inner shrinking cylinder 8 by force, the inner shrinking cylinder 8 moves towards the lower outer shell 12 against the elasticity of the lower spring 9, the needle 21 penetrates through the sterilizing sheet 91 and then extends out of the inner shrinking cylinder 8, the injection site is penetrated, and then the switch 7 is pressed, so that automatic injection can be realized. After the injection is completed, the automatic injector is taken away from the injection position, the external force applied to the inner retraction barrel 8 disappears, the lower spring 9 returns to the needle 21 to the inner retraction barrel 8, and the used and discarded ejection injector is prevented from causing injury accidents.

Example two

The present embodiment differs from the first embodiment only in the structure of the cylinder. Referring to fig. 2, the syringe is a spring bottle 24, and the spring bottle 24 can be axially expanded and contracted when subjected to an axial external force. The portion of the spring bottle 24 near the needle 21 is fixed in the lower housing 12, and the middle and upper portions are contracted toward the needle by the pushing of the push rod, so that the liquid medicine in the spring bottle 24 is injected through the needle 21. The syringe adopts a spring bottle structure, so that the structure can be further simplified and the cost can be reduced.

According to the automatic injector, the switch is pressed down, the driving of the motor is transmitted to the push rod through the cooperation of the screw rod and the nut, so that the push rod moves downwards, and the liquid medicine in the needle cylinder is injected. The needle is well protected in the retraction cylinder before injection, so that the needle is prevented from being damaged before use, and the needle is convenient to transport and store; the needle is retracted into the retraction barrel after injection, so that the injury accident caused by the discarded automatic injector after use is prevented, and the disposal of the discarded automatic injector is facilitated.

Claims (8)

1. The utility model provides an automatic injector, includes shell, syringe needle (21), cylinder (22) and push rod (4), sets gradually syringe needle, cylinder and push rod from bottom to top in the shell, and the lower extreme of cylinder (22) is connected to syringe needle (21), and its head stretches out outside the shell, and cylinder (22) are used for holding the liquid medicine, and is fixed in the shell, and the push rod can move down to make the liquid medicine in the cylinder inject out from the syringe needle, its characterized in that still includes battery (6), switch (7) and the actuating mechanism of setting in the shell, and actuating mechanism includes motor (30), screw rod (32) and nut (31), and the nut is installed the upper end of push rod (4), has the screw hole that link up in the axial at the middle part, and push rod (4) have the through-hole that link up in the axial at the middle part, the screw rod with the screw hole cooperation of nut, and its lower extreme stretches into in the through-hole of push rod (4), the upper end with the pivot of motor is connected, battery, switch and motor electricity are connected.

2. The automatic injector according to claim 1, further comprising a protection device comprising a retraction barrel (8) and a lower spring (9), wherein the upper part of the retraction barrel (8) is arranged in the housing, the lower part of the retraction barrel (8) extends out of the housing and can move up and down relative to the housing, a cavity is formed in the retraction barrel (8), the upper end of the cavity is open, the lower end of the cavity is provided with an end wall (81), the center of the end wall (81) is provided with a penetrating hole (82), the lower spring (9) is arranged on the inner side of the retraction barrel (8), the lower end of the lower spring is arranged on the end wall (81), and the needle (21) is opposite to the penetrating hole (82) in the retraction barrel (8) and penetrates through the lower spring (9).

3. An autoinjector according to claim 2, wherein the upper end of the cylinder (22) is open, the upper part being provided with a piston (23), the piston (23) being movable up and down relative to the cylinder and sealing against the cylinder, the plunger being above the piston (23) to urge the piston to move downwardly.

4. The automatic injector of claim 2, wherein said barrel is an axially retractable spring-loaded vial, a portion of the spring-loaded vial adjacent said needle being secured within said housing, said plunger being adapted to urge the spring-loaded vial to retract toward said needle.

5. An automatic injector according to any one of claims 2 to 4, characterized in that the end wall (81) of the retraction barrel (8) is provided with a sterilizing tab (91) having a sterilizing function, the sterilizing tab (91) covering the puncture hole (82).

6. The automatic injector according to claim 5, characterized in that the housing is provided with an axially extending guide groove (121), and the outer wall of the upper end of the inner barrel (8) is provided with an outwardly protruding projection (83), the projection (83) being placed in the guide groove (121).

7. The automatic injector according to claim 6, wherein a sterilizing sheet cover sheet (92) is provided on the outer side of the sterilizing sheet (91), and the sterilizing sheet cover sheet (92) is provided with a through hole at a position facing the puncture hole (82).

8. The automatic injector according to claim 7, characterized in that the upper end of the housing is provided with an upper cover (5), the battery being in the upper cover (5).