Device for introducing a catheter into a body cavity

摘要

A catheter for spinal anesthesia has a needle arranged therein. The length of the needle is smaller than the length of the catheter. The rear end of the needle is connected to a handling thread for pulling the needle out of the catheter towards the proximal end. The needle is designed as a hollow needle with a lateral opening. When advancing the tip of the needle into the subarachnoid space, liquor flows through the opening into the catheter, allowing for verification of successful puncture. During puncture of the dura with the tip of the needle, the puncture hole is widened by the front end of the catheter so that the catheter fills the puncture hole completely. After puncture, the needle is withdrawn by pulling the handling thread.