Anaesthesia
-
The large lateral hole of the Sprotte needle is claimed to aid cerebrospinal fluid efflux during the performance of spinal anaesthesia. Using theoretical calculations and practical measurement we have shown that reducing the area of the lateral hole to that of the cross sectional area of the needle does not affect the flow rate. We suggest this modified Sprotte needle is an improved design which has the potential advantages of reducing the incidence of inadequate spinal anaesthesia and strengthening the needle tip.
-
We present our experience with a new combined spinal epidural system through which regional anaesthesia was performed in 30 male patients undergoing suprapubic prostatectomy. The technique consists of two needles, a 17 G Tuohy needle with a hole in its distal curve (back eye) and a 29 G spinal needle which is passed through the back eye before being introduced into the subarachnoid space. We found the back eye combined spinal-epidural system effective and simple to use. The Tuohy needle with its back eye did not impede insertion of the epidural catheter and was a suitable introducer for the thin 29 G spinal needle.