Biopsy needles are specialized medical instruments used to extract tissue samples for diagnostic analysis of suspicious masses, tumors, infections, or inflammatory conditions in organs like breast, liver, prostate, lung, or bone. Types include fine-needle aspiration (FNA) (22-27G thin Chiba needles for cytology smears from cysts/lymph nodes), core biopsy (14-18G Tru-Cut with notched cannula/stylet for intact tissue cores in breast/prostate), vacuum-assisted (VAB) (11-14G Mammotome for larger/multiple samples), and bone marrow (Jamshidi trephine). Echogenic tips aid ultrasound/CT guidance; sizes balance sample yield vs. trauma.