Patent Number: 
Section: claims

1. A sample manipulation device, comprisingan observation unit which is used to observe a sample and to select a target position at which a portion to be removed from the sample is located,a specimen stage which receives the sample,a manipulation tool, which is spatially shiftable relative to the observation unit and comprises an exchangeable manipulation tip by which said portion is removed from said sample,a control unit which controls the shifting of the manipulation tool; andan optical position measurement unit which is connected to the control unit,wherein the position measurement unit and the observation unit are each provided as microscopes, the specimen stage being arranged between the observation unit and the optical position measurement unit and the position measurement unit comprising an objective having a depth of focus on the order of magnitude of the manipulation tip; andwherein the position measurement unit is used to determine the actual position of the manipulation tip so that specific shifting of the manipulation tip to the target position can be carried out by the control unit. 2. The sample manipulation device as claimed in claim 1, further comprising an image-recording and image-processing unit provided in the position measurement unit. 3. The sample manipulation device as claimed in claim 1, wherein the specimen stage is shiftable relative to the observation and position measurement units. 4. The sample manipulation device as claimed in claim 1, wherein the position measurement unit is shiftable along its optical axis. 5. The sample manipulation device as claimed in claim 1, wherein the optical axes of the objectives of the observation and position measurement units are parallel to each other. 6. The sample manipulation device as claimed in claim 5, wherein the optical axes coincide. 7. The sample manipulation device as claimed in claim 1, further comprising laser-optical tools coupled into the object plane by the objective of the position measurement unit. 8. The sample manipulation device as claimed in claim 1, wherein a stereo microscope or an incident-light microscope is provided as the observation unit. 9. A sample manipulation device, comprising an observation unit, which is used to observe a sample and to select a portion to be manipulated, a specimen stage which receives the sample, and an optical manipulation unit, by which the selected portion can be manipulated, said specimen stage being arranged between the observation and manipulation units and said manipulation unit being provided as a microscope, wherein a stereo microscope is provided as the observation unit. 10. The sample manipulation device as claimed in claim 9, wherein the specimen stage is shiftable relative to the observation and manipulation units. 11. The sample manipulation device as claimed in claim 9, wherein the manipulation unit is shiftable along its optical axis. 12. The sample manipulation device as claimed in claim 9, wherein the optical axes of the objectives of the observation and manipulation units are parallel to each other. 13. The sample manipulation device as claimed in claim 12, wherein the optical axes coincide. 14. The sample manipulation device as claimed in claim 9, wherein the manipulation unit comprises laser-optical tools. 15. The sample manipulation device as claimed in claim 1, further comprising an image-recording unit and an image-processing unit provided in the observation unit. 16. The sample manipulation device as claimed in claim 1, further comprising laser-optical measurement devices coupled into the object plane by the objective of the position measurement unit. 17. The sample manipulation device as claimed in claim 9, wherein the manipulation unit comprises laser-optical measurement units.