GERÄT ZUM ANZEIGEN DER DURCHDRINGTIEFE EINES TROKARS SOWIE EINSTELLUNGSGERÄT FÜR EINE FÜHRUNGSRÖHRE

A trocar penetration depth indicator 22 has a first, inner housing 24 including a first threaded section 46 and longitudinally extending gripping fingers 48, and a second, outer housing 26 including a camming surface 32 and a second threaded section 36 to engage the first threaded section. The first and second housings slidably mount onto a trocar tube 12 and can be secured relative to the guide tube by rotatably tightening the housings to cause the gripping fingers to firmly grip the trocar tube. Depth penetration indicia 20 is provided on the guide tube surface and sufficient guide tube grasping force is obtained to prevent the depth indicator from being dislodged during trocar insertion. A guide tube positioning device is provided to engage the penetration depth indicator and to secure the guide tube relative to the surrounding skin of the patient in order to prevent inadvertent withdrawal or further insertion of the trocar.