Instrument for taking a tissue sample

摘要

An instrument for taking a tissue sample includes a tissue receiving element with a distal end and a proximal end and at least partly has a spiral or helix that has an outer surface and a central longitudinal axis (X-X′). The spiral or helix has at least has one zone where the distance (dd) from the outer surface to the central longitudinal axis (X-X′) is smaller than at a more proximally located part of the spiral or helix.

主权项

1. An instrument for taking a tissue sample, comprising:
a tissue receiving element having a distal end and a proximal end; said element comprising a spiral or helix that has an outer surface and a central longitudinal axis; said spiral or helix having at least one zone where the distance (dd) from the outer surface to the central longitudinal axis (X-X′) is smaller than at a more proximally located part of the spiral or helix, so that the zone runs from the distal end in the direction of the proximal end over a distance of at least one complete winding of the spiral or helix; said spiral or helix having an inner surface wherein a distance (dw) from said inner surface to the central longitudinal axis (X-X′), at every position in the zone or over at least a section of the zone that connects to the distal end, is equal to the distance (dw) at every more distally located part of the spiral or helix; and said spiral or helix being formed by a helical body wherein a thickness (da-dw) of the helical body for every successive winding, going from the proximal end to the distal end, is smaller than for the previous windings.