alt Hacker NewsThis really needs to be done for a GLP-1 auto injecting needle.
Pretty sure it’s the same as an epi-pen as well.
It blows my mind. It’s a disposable, single use device that at the press of button:
1. Inserts the needle in your skin, 2. Slowly presses the plunger until the dose is injected 3. Then retracts the needle with plunger
Three distinct and seemingly opposing motions. With timing. All in a little plastic enclosure. It sure I can think of a toy with that kind of mechanism.
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There's an even fancier mechanism with e.g. glucagon pens, where it actually has to rehydrate the freeze dried hormone (glucagon forms aggregations when it sits, has to be mixed fresh)
When I was a kid I needed growth hormone shots. we used regular syringes that fit into this tan plastic "gun" thing. you pulled back the top into a locked position. placed the tip of the gun to the skin where the needle should inject, and pressed the trigger button to release the lock. can't remember if it also pushed the plunger though. this was back in the 90's.
Steve Mould has a great video explaining the mechanism in epi pens
Check out this video from Steve Mould; I think it covers exactly what you're looking for!
https://youtu.be/CfhsW1kaa2Q?is=ug5_Ze2HczVMGTMR