What difference does bone marrow puncture needle have with bone marrow biopsy needle excuse me?

Oh, bone marrow puncture means to Pierce a bone needle into the bone rich in bone marrow, take out the needle core, connect a syringe (syringe) to suck the bone marrow fluid with negative pressure.
And bone marrow biopsy, then after bone marrow puncture further need to use biopsy needle hard forceps to bite off a part of bone marrow tissue, this is especially helpful for bone marrow puncture multiple "dry extraction", such as some diseases such as myelofibrosis, so you only bone marrow puncture, then often dry extraction, marrow fluid.
So a bone marrow biopsy is a further diagnostic tool