Aspiration instrument for cell biopsy purposes

In an aspiration instrument for cell biopsy purposes, comprising:

• a cylinder which at the distal end is provided with means for fastening a hypodermic needle,
• a plunger having a piston at its distal end, which piston is movable in the cylinder between a first position and a second position,
• guide means for guiding the plunger,
• pre-compression means by means of which the plunger is pre-compressible in the direction of the first position, which pre-compression means are activated when the plunger is moved from the first to the second position,
• locking means by means of which the plunger can be locked in the second position,
• means for unlocking the locking means, in order to make the plunger move from the second to the first position under the influence of the pre-compression means, the improvement wherein
• the plunger, the guide means for the plunger, the pre-compression means, the locking means and the unlocking means therefor are combined to form a single unit to which the cylinder provided with the piston is detachably connected, said unit being made of sterilizable material, and wherein the plunger is provided with a piston holder at its distal end for detachable connection with said piston.