This is a prototype epinephrine injector of my own unique design. It is meant for a user to quickly self-administer an epinephrine injection, normally into their own thigh with a stabbing motion. This injector was created using prototype parts: FFF 3D printed PLA, and off-the-shelf springs and syringes.

The inspiration for this project is the outrageous prices that branded epinephrine injectors are sold for. The most famous product, the EpiPen, continues to increase over time and is currently over $700 for a pack of two. After discovering this, I realized that the mechanism in an EpiPen is relatively simple, so I hoped to recreate the function at a much cheaper cost.

An epinephrine injector must execute a few key basic functions:

1. It must have no exposed needle before being used.
2. When the front end is pressed against a surface, it must deliver a needle ~1 inch deep into said surface.

3. It must inject ~0.3 ml of epinephrine through the needle.

My main focus for this prototype was to design the mechanical assembly which would allow steps 1 and 2. It was difficult to tune things such as liquid injection and activation force required using store-bought springs and syringes.

There are many improvements which could be made to this prototype. In particular, I would focus on covering up the needle after use to prevent accidental injury / spread of disease, as well as reducing the form factor and prototype elements.