女，35岁。左手示指末节肿胀、疼痛3天。3天 前洗鱼时被鱼刺扎伤左手示指末节。起病时指尖有针 刺样疼痛，轻度肿胀，继而肿胀明显加重，有剧烈的跳痛。査体T37.9 左示指末节肿胀明显，指腹张力明 显增高，触痛明显。血常规：WBC 13.0 x 109/L, N 0. 89,如行手术治疗，正确的操作是

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