Biopsy device to remove tissue with a needle has pneumatic delay device comprising a cylinder and piston with a bounded displacement space

摘要

A biopsy device for removing tissue with a needle comprises a needle (115) and sheath with a needle carriage (120) that is behind the sheath in the insertion direction and with the sheath and needle carriages moving between rest and end positions with a transporting unit, stop and needle release device. A pneumatic delay (300) is coupled to a carriage push unit (160,260) and comprises a cylinder/piston with a bounded displacement space. A piston lift communicates the space with the surroundings (1) and is then isolated from them.