Non-PRO English to Spanish Medical Cosmetics, Beauty Dermatología

Hi there!

I have a text about microchannel skin system and there is one sentence I don't know how to translate it into Spanish quite well. Hope you can help me.
The microchannel skin system consists of a non-sterile reusable application handle (single patient use) and a sterile patch with microneedles.

I know the meaning but I don't know how to translate "handle" in this context.

Thank you very much!