There are manual type, pneumatic type and hydraulic type WS spoolers for choice.
WS收线机分别有手动式、气动式、液压式的机型供用户选择。
All the patients were treated with canalplasty, and 84 cases(84 ears) with mastoid process of pneumatic type were treated with tympanoplasty and canalplasty.
对84例（84耳）气化型乳突患者同时行耳道成形术和鼓室成形术。
All the patients were treated with canalplasty, and 84 cases(84 ears) with mastoid process of pneumatic type were treated with tympanoplasty and canalplasty.
对84例（84耳）气化型乳突患者同时行耳道成形术和鼓室成形术。
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