A self-powered automatic injection device

Abstract

The utility model relates to pen formula injection device technical field, concretely is a kind of self-driving automatic injection device, comprising: shell, medicine bottle support is arranged in shell;Needle cover is arranged in the shell inside;The upper portion of the shell inside is provided with energy storage locking assembly, and energy storage locking assembly is configured as: before injection, driving rod is locked by needle cover, when one end of needle cover moves to driving rod direction under stress, driving rod is unlocked, torsional spring provides driving force and makes driving rod drive push rod move to medicine bottle direction, realizes injection.The utility model can provide stable and reliable injection power, and quickly realize injection;In addition, whether pull out in injection or pull out after injection is completed, needle cover can be locked, so that it is no longer retracted, prevent secondary injection, safe and reliable.

Claims

1. A self-driven automatic injection device, comprising: An outer casing, wherein a medicine bottle holder is provided inside the outer casing, and the medicine bottle holder holds the medicine bottle; A hidden needle sleeve is provided at the lower part of the interior of the outer shell. The key feature is that an energy storage locking assembly is disposed above the interior of the outer shell. The energy storage locking assembly includes a torsion spring, a drive rod, and a push rod. The torsion spring is disposed outside the drive rod, and the push rod is disposed inside the drive rod. The energy storage locking assembly is configured such that: before injection, the drive rod is locked by the concealed needle sleeve; when one end of the concealed needle sleeve is subjected to force and moves towards the drive rod, the drive rod is released from locking, and the torsion spring provides driving force to drive the push rod to move towards the medicine bottle, thereby realizing injection.

2. The self-driven automatic injection device according to claim 1, characterized in that, A needle anti-puncture protection component is provided at the bottom inside the outer shell. The needle anti-puncture protection component includes the hidden needle sheath. The needle anti-puncture protection component is configured such that the hidden needle sheath can be locked after being pulled out during or after injection, thus preventing further injection.

3. The self-driven automatic injection device according to claim 2, characterized in that, The needle anti-puncture protection component also includes a locking sleeve, which is disposed above the concealed needle sleeve; The lower surface of the locking sleeve is provided with circumferentially distributed oblique teeth, and the upper surface of the hidden needle sleeve is provided with a sliding inclined surface that cooperates with the oblique teeth, and the sliding inclined surface abuts against the oblique teeth. A sliding inclined pin is provided on the inner wall of the outer casing, and the sliding inclined pin is embedded in the inclined tooth; An elastic element is fitted onto the outer wall of the locking sleeve. The upper end of the elastic element abuts against the medicine bottle holder, and the lower end of the elastic element abuts against the outer wall of the locking sleeve. A top rod is provided on the outer wall of the medicine bottle holder, and a locking strip is provided on the upper end of the locking sleeve. In the initial state, the top rod and the locking strip are on different axes; after being pulled out, the top rod and the locking strip are on the same axis.

4. The self-driven automatic injection device according to claim 1, characterized in that, The upper end of the outer shell is connected to the pen cap, the upper end of the torsion spring is engaged with the pen cap, and the lower end of the torsion spring is engaged with the lower end of the drive rod; before injection, the torsion spring is in a charged state.

5. The self-driven automatic injection device according to claim 1, characterized in that, The lower end of the drive rod is provided with a gear plate, and the outer wall of the gear plate is provided with a hidden needle sleeve meshing tooth; the upper end of the hidden needle sleeve is provided with a locking pin, and the inner wall of the locking pin is provided with a drive rod meshing tooth. Before injection, the drive rod engagement teeth engage with the hidden needle sleeve engagement teeth; When one end of the hidden needle sleeve is subjected to force and moves in the direction of the drive rod, the meshing teeth of the drive rod separate from the meshing teeth of the hidden needle sleeve.

6. The self-driven automatic injection device according to claim 5, characterized in that, Multiple limiting strips are provided on the inner wall of the outer casing, and the locking pin is embedded between two adjacent limiting strips; and a limiting surface is provided on the inner wall of the outer casing, and the hidden pin sleeve is snapped onto the limiting surface.

7. The self-driven automatic injection device according to claim 6, characterized in that, The inner wall of the drive rod is provided with a push rod engagement rib, which extends along the axial direction of the drive rod; the outer wall of the push rod is provided with a drive rod engagement rib groove, and the push rod engagement rib is embedded in the drive rod engagement rib groove.

8. The self-driven automatic injection device according to claim 1, characterized in that, A connecting block is provided between the drive rod and the medicine bottle holder. The upper surface of the connecting block is provided with ribs, which are arranged in a radial array along the connecting block. A downwardly extending lever is provided on the lower surface of the drive rod. During the rotation of the drive rod, the lever continuously strikes the ribs.

9. The self-driven automatic injection device according to claim 8, characterized in that, A limiting groove is provided on the outer wall of the connecting block, and a limiting strip is provided on the inner wall of the outer shell. The limiting strip is embedded in the limiting groove. A spiral rib is provided on the inner wall of the connecting block, and a spiral tooth is provided on the outer wall of the push rod. The spiral rib meshes with the spiral tooth.

10. The self-driven automatic injection device according to claim 1, characterized in that, The hidden needle sleeve is provided with a hidden needle sleeve observation window, and the outer shell is provided with an outer shell observation window. The hidden needle sleeve observation window and the outer shell observation window partially overlap.

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