sunny-I had mine inserted a few years before I was bite. I haven't had any issues at all.
Just in case you haven't seen this
www.bardbiopsy.com/pdf/UltraClip_Dual_Trigger_Patient_Brochure_S11697-0.pdfThey are roughly the size of a sesame seed.
Regardless of what you decide-I'm sending you oodles and oodles of positive thoughts for your biopsy.
Janet