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Patent Granted Spinal anaesthesia (or spinal anesthesia), also called spinal analgesia[citation needed], spinal block or sub-arachnoid block (SAB), is a form of regional anaesthesia involving injection of a local anaesthetic into the subarachnoid space, generally through a fine needle, usually 9 cm long (3.5 inches). For extremely obese patients longer needles are available (12.7 cm / 5 inches).
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