Abstract: A biopsy unit comprising an outer catheter, and an inner aspirator, the catheter including a longitudinally extending hollow flexible housing tube and means for gripping the aspirator, the aspirator including a longitudinally extending hollow flexible aspirating tube adapted to slide longitudinally within the housing tube when not gripped by the gripping means, a connector adapted to be fitted to a suction source and fastened to one end of the aspirating tube, and a hollow needle fastened to the other end of the aspirating tube, the lumen of the needle communicating with the connector through the aspirating tube.