xLED over/under vein?

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I’m not really knowledgeable enough to give any advice, but implants traveling veins has been discussed at least once:

My lung implant

Hello people of the internet I am a man who like to live free. I love running and swimming and loved the idea of being able to do those bare handed. That brought me to you! My father was murdered, shot at the heart in the surgical room of his own hospital while he was performing a surgery, in 1996, I was 10. I inherited the hospital and the avoidance of the health society in my small town close to Rio de Janeiro. I wanted the flex chip, but I thought the injected one would make it easier to d…