Automatic injection system

Abstract

This invention provides an automated injection system comprising a button, a middle housing, an inner ring housing, and a switching component. The button has a ring cover structure and a protruding edge on its side wall. The inner cylindrical space of the middle housing is fitted with both the button and the inner ring housing. The button, middle housing, and inner ring housing achieve synchronous rotational movement through a snap-fit ​​mechanism. The switching component includes a pressing stop surface and a guide groove. The protruding edge of the button switches between a locked waiting position before the pressing stop surface and an injection waiting position before the guide groove through synchronous rotational movement. The synchronous rotation switches between two states: when locked, the protruding edge is obstructed by the pressing stop surface; when unlocked, the protruding edge aligns with the guide groove, pressing it into the guide groove and pushing the injection plunger forward in the injection direction to complete the drug delivery.

Claims

1. An automatic injection system, comprising: a push button having a ring-shaped cover structure, the ring-shaped cover structure having a protruding flange on its sidewall; an inner ring housing; and a middle housing having an internal cylindrical space, one side of the internal cylindrical space being fitted over the push button, and the other side of the internal cylindrical space opposite to the push button being fitted over the inner ring housing, wherein... The internal cylindrical space, the ring cover structure, and the inner ring shell are connected by a snap-fit ​​mechanism, through which the button, the middle shell, and the inner ring shell generate a synchronous rotational motion; and a switching member has a pressing stop surface and a guide groove, wherein the protruding edge of the button is switched between a locking waiting position corresponding to the pressing stop surface and an injection waiting position corresponding to the guide groove by the synchronous rotational motion; wherein, when the automatic injection system is in a locked state, the protruding edge is located in the locking waiting position before the pressing stop surface, so that when the button is pressed, the protruding edge abuts against the pressing stop surface to stop the button from moving in an injection direction; or, when the automatic injection system is in an unlocked state, the protruding edge is located in the injection waiting position before the guide groove, so that when the button is pressed, the protruding edge is guided into the guide groove, causing the button to push an injection plunger to move in the injection direction.

2. The automatic injection system as claimed in claim 1, wherein the snap-fit ​​mechanism formed between the button, the middle housing, and the inner ring housing comprises: an axially inner protruding rib in the inner cylindrical space of the middle housing, and a plurality of external grooves corresponding to the axially inner protruding rib on the outside of the button and the inner ring housing; or, an axially inner groove in the inner cylindrical space of the middle housing, and a plurality of external protruding ribs corresponding to the axially inner groove on the outside of the button and the inner ring housing.

3. The automatic injection system as claimed in claim 1, wherein the protruding edge is an arcuate protruding edge extending along the curved surface of the ring cover structure, integrally formed with the ring cover structure, and the contact section between the protruding edge and the ring cover structure is provided with rounded corners or arc surfaces to reduce stress concentration.

4. The automatic injection system as claimed in claim 1, wherein the button has at least two of the protruding edges, and the switching member has at least two guide grooves respectively corresponding to the protruding edges; wherein, The gaps, angles, or circumferential widths between these protruding edges are the same or different from each other to improve the stability of the button when pressed and to provide assembly orientation identification and error prevention for the automatic injection system.

5. The automatic injection system as claimed in claim 1, wherein the inner ring housing has a latching unit that provides resilient latching points corresponding to the unlocked and locked states during the synchronous rotational movement, to provide tactile or auditory feedback and to suppress unintended rotation.

6. The automatic injection system as claimed in claim 1, wherein the material used to make the button, the middle housing, or the inner ring housing has rigidity, toughness, and high dimensional stability.

7. The automatic injection system as claimed in claim 1 further includes a resilient reset element, one side of which abuts against the button. In the unlocked state, the resilient reset element provides an automatic reset function for the button after it is pressed, and in the locked state, the resilient reset element can maintain an anti-pressing gap between the protruding edge and the pressing stop surface.

8. The automatic injection system as claimed in claim 1, wherein the injection plunger has two elastic limiting arms disposed opposite each other on one side and a shaft on the other side, the shaft having an annular groove in the upper part, and the free end of the shaft being a drug-pushing end.

9. The automated injection system as described in claim 8 further comprises: a vial gripping unit for gripping a vial, the vial gripping unit having at least one resilient fastening portion; a driving spring abutting against the injection plunger to drive the vial gripping unit; and a guiding unit; wherein, Before an injection procedure, the injection plunger, the vial holding unit, and the drive spring are disposed in the guide unit. The elastic holding part in the vial holding unit is restricted by the inner diameter of the guide unit and pressed inward to engage with the annular groove of the injection plunger, so that the vial moves with the injection plunger.

10. The automatic injection system as claimed in claim 9, wherein when the injection procedure begins, the vial holding unit moves together with the vial in an injection direction until the resilient fastener disengages from the internal pressure restriction of the guide unit, the resilient fastener unfolds outward to release the engagement between the vial holding unit and the annular groove, and the injection pusher continues to push a needle in front of the vial out of the outside of an injection device.

11. The automatic injection system as claimed in claim 10, wherein when the resilient retaining portion is extended outward, the injection plunger pushes the vial, and the pusher end dispenses the medication from the vial to the outside of the needle via a pusher plug.

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