Patent ID: 8221331

Claim:
An apparatus for fetal scalp blood sampling, having a shaft, a blade that is mounted removably in the distal end of the shaft and that is mounted in a blade holder that can be slid in the axial direction of the shaft by means of a positioning mechanism comprising a guide track between a starting position mounted in the shaft, a working position extending beyond the distal end of the shaft and a change-over position protruding beyond the working position in the distal direction of the shaft, wherein the blade is fixed in place by the positioning mechanism in each particular end position, and also having a blood sampling device mounted on the distal end of the shaft, characterized in that the positioning mechanism includes a spring loaded push-button which can be pressed down into the guide track in a direction perpendicular to the sliding direction against the force of a least one spring element and that can be slid in the guide track between the end positions, wherein the guide track is shaped as a single U with both limbs of the U-shaped guide track running parallel in the axial direction of the shaft having differing lengths, and in that in the change-over position of the blade holder the blade can be removed directly without taking apart any further component of the apparatus.