Distal tip tissue sampling arrangement

A method of obtaining a tissue sample during biopsy, the method comprising the steps of:

• providing an arrangement comprising an elongated hollow member, having a circular cross-section in a plane perpendicular to a longitudinal axis of said elongated hollow member and comprising a distal end being provided with a cutting edge, wherein said cutting edge is a circular cutting edge being perpendicular to the longitudinal axis of the elongated hollow member, and said elongated hollow member further being provided with at least one cutting slit running from said cutting edge in a proximal direction of said elongated hollow member, wherein the at least one cutting slit is a V-shaped, U-shaped or square-shaped slit extending from the cutting edge in the longitudinal direction of the hollow member, wherein the length of the at least one cutting slit is approximately 5-10 mm and wherein where the at least one cutting slit is located there is a fixed point in the distal end of the hollow member at which the tissue sample is fixated for cutting off the sample from surrounding tissue, and wherein said arrangement further comprises a rotational member, configured to apply rotational movement to said elongated hollow member;
• providing an elongated rod configured to fit inside said elongated hollow member, and
• generating, by a longitudinal movement generating unit, an oscillating longitudinal movement of said elongated hollow member, or of an assembly of said elongated hollow member and said elongated rod;
• inserting said distal end of said elongated hollow member into a desired tissue sample site thereby collecting the tissue sample within the distal end of the elongated hollow member;
• rotating by said rotational member said elongated hollow member in a first direction a predefined amount of rotations to separate the tissue sample from surrounding tissue;
• thereafter rotating by said rotational member said elongated hollow member in a second opposite direction a second predefined amount of rotations, the first and second predefined amount of rotations being approximately the same, wherein said predefined amount of rotations is a predefined number of revolutions being at least 1.5 revolutions, and not more than 10 revolutions, in each direction, and said rotational member is configured to rotate said elongated hollow member during a predetermined time period in each direction, being said predefined amount of rotations, wherein said time period is in the interval 10-40 ms;
• and
• subsequently removing said elongated hollow member from the desired tissue sample site by retraction.