Hello how are you? Just for clarification purposes, are you asking about the lancet holder that looks like a small pen or the lancet, which is the sharp point or needle that is placed in the holder. The lancets are only ever used once. We are not medical professionals but I hope to gather more information from you to give you the best response.
Here is an article which may provide more insight on HIV transmission: https://h-i-v.net/transmission
I hope to hear from you soon