Biopsy needle set

Abstract

In application of a biopsy needle set which is utilized for collecting diseased tissue sections from internal organs in a human body without requiring surgical operation, it is desirable to be certainly taken out the tissue sections by single puncture and to decrease injury of such diseased part in addition, to reduce pain in the patient at the time of sticking into the human body with the needle. In an end of suction type biopsy needle set containing double needle set of an outer needle and an inner needle, the outer needle is narrowed to form a closely contacting portion with the inner needle, whereby negative pressure can be accumulated in a cylinder at the early stage of such suction, while thus accumulated negative pressure is transferred to an opening of the outer needle at the moment when the withdrawn inner needle is passed through the above described closely contacting portion, so that such suction force sufficient for collecting the tissue sections is produced. In this case, valve function of the needle tip construction in the above biopsy needle set can realize reliability of collecting the tissue sections. Furthermore suction can be in one-handed operation by such construction that a plunger is provided with a knob projecting through the notched split formed on the cylinder.