What is the 1st and 2nd vital injector needle differences.

Comparing with the 1st vital injector needle, the 2nd generation needle not only add a flap, also change the circulation system
Because vital injector 2 with filter to avoid dirty and dose access machine inside.
In order to save more dose to 2nd needle inside flow way allow to collect waste dose back to filter again,
after filtering do the second injection.
So 1-3ml dosage finish one time injection


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