Handheld tissue sample extraction device

A handheld device (1) for extraction of tissue samples (27), comprising a needle arrangement (25) and control arrangement (2),

• said needle arrangement (25) comprising a cutting needle (4) and a sample extraction needle (3),
• said needle arrangement (25) having a first end (28) for inserting into tissue (30), said cutting needle (4) comprising a cutting edge (23) for cutting said tissue sample (27) from said tissue (30),
• said sample extraction needle (3) comprising a side opening (5) for receiving said tissue (30),
• wherein said cutting needle (4) and said sample extraction needle (3) are adapted for moving relative to each other in a direction along a longitudinal axis (29) of the needle arrangement (25) from a first relative position to a second relative position,
• wherein at least a part of said side opening (5) is exposed in said first relative position,
• wherein said side opening (5) of said sample extraction needle (3) is covered in said second relative position, and
• wherein said movement from said first relative position to said second relative position comprises an oscillatory rotation of said cutting needle (4) relative to said sample extraction needle (3) about the longitudinal axis (29) of the needle arrangement (25), where said oscillatory rotation comprises at least a first relative rotation and a second relative rotation in opposite rotational directions during said relative movement of the cutting needle (4) and sample extraction needle (3) along the longitudinal axis (29) of the needle arrangement;
• and
• an oscillation control arrangement (11),
• wherein the oscillation control arrangement (11) comprises a protruding ridge (20) that extends overall in a direction of the longitudinal axis (29) but also rotates around the longitudinal axis (29) back and forth along the direction of the longitudinal axis (29), and
• wherein the oscillation control arrangement is configured such that when the oscillation control arrangement (11) moves in a direction along the longitudinal axis (29), the protruding ridge (20) moves through a slit formed by a first protrusion (21) and a second protrusion (22), such that, during this movement, the first and second protrusions (21), (22) force the oscillation control arrangement (11) to rotate about the longitudinal axis (29), thereby facilitating the oscillatory rotation of the cutting needle (4), when the oscillation control arrangement (11) moves in a direction along the longitudinal axis (29) of the needle arrangement (25) due to the cutting needle (4) being connected and fixated to the oscillation control arrangement (11).