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You don’t even need the movies to have some dystopian implant horror. Second sigh used to produce a sight restoring implant. After some financial trouble they stopped manufacturing and support for one of their products. Leaving recipients of the implant sightless in the case the hardware breaks.
If you are really really curious, you can find a phlebotomist that is game and use your own blood. This is the most ethical way to get some cooking blood and it can be done. (For proof see article)
https://www.vice.com/en/article/i-made-meringues-out-of-my-own-blood-and-ate-them/