The Menghini needle has a sharpened cannula  and allows the extraction of tissue frustules that are retained inside the cannula thanks to the vacuum created by the suction mechanism.
This needle is used in liver biopsy procedure because the organ is highly vascularized and such a less traumatic instrument is preferable to the guillotine sharpened needles. It prevents internal bleeding and allows the extraction of long and compact frustules. Using this needle means ecreasing the risk of the fragmentation of the frustules even in case of cirrhosis.