Trocar arrangement for tissue sampling device

An arrangement for taking a biopsy in a human or animal tissue, comprising an elongated hollow member, comprising a proximal end and a distal end, wherein the elongated hollow member has a circular cross-section in a plane perpendicular to a longitudinal axis of said hollow member, and said distal end is provided with a cutting edge,

• wherein said arrangement further comprises
• an elongated rod configured to fit inside said elongated hollow member,
• a longitudinal movement generating unit configured to generate an oscillating longitudinal movement of said elongated hollow member, or of an assembly of said elongated hollow member and said elongated rod, and
• a connection assembly configured to assemble said elongated hollow member and said elongated rod by detachably fixating said elongated rod inside said elongated hollow member in a longitudinal position relative to said elongated hollow member, wherein the connection assembly comprises a needle hub attached to said hollow member, and a locking member, configured to be in two distinct states, a locked state and an unlocked state, to respectively lock and unlock the elongated rod to the needle hub, and that said longitudinal movement generating unit is configured to apply said oscillating longitudinal movement to said elongated hollow member, or of the assembly of said elongated hollow member and said elongated rod via said connection assembly.