Chan K K, Watmough D J, Hope D T, Moir K
Ultrasound Med Biol. 1986 Apr;12(4):279-83. doi: 10.1016/0301-5629(86)90337-6.
The Cavitron Ultrasonic Surgical Aspirator (CUSA) has been applied in neurosurgery for several years, but its mode of action is not yet clear and its efficiency at removing soft tissue has not been quantified. We describe here how we have measured the rate of removing soft tissue per unit time, taking ox-liver tissue as the test material. A motor-driven vibrator/aspirator has been developed in our laboratory. It has permitted us to examine the effect of varying independently frequency, amplitude of the vibration, and suction pressure on the removal rate. The results of this investigation show that beyond a certain tip acceleration amplitude (about 100 g) the removal rate does not increase significantly. Also the removal rate is more or less independent of vibration amplitude within the range between 300 micron and 1 mm. Our in vitro experiments with the new probe show that a tip acceleration of about 100 g is enough to remove ox-liver tissue and then the rate of removal is comparable to that obtained with the CUSA operating at maximum vibration amplitude. Analysis of the particle size of the debris collected from CUSA and from our motor-driven device shows that the particle size distribution is similar over the range of 0.5 micron less than d less than 250 micron.
卡维特龙超声手术吸引器（CUSA）已在神经外科应用多年，但其作用方式尚不清楚，且其去除软组织的效率也未得到量化。我们在此描述了我们如何以牛肝组织为测试材料来测量单位时间内软组织的去除率。我们实验室已研制出一种电动振动器/吸引器。它使我们能够分别研究频率、振动幅度和抽吸压力的变化对去除率的影响。这项研究结果表明，超过一定的尖端加速度幅度（约100g）后，去除率不会显著增加。而且在300微米至1毫米的范围内，去除率或多或少与振动幅度无关。我们用新探头进行的体外实验表明，约100g的尖端加速度足以去除牛肝组织，此时的去除率与CUSA在最大振动幅度下操作时所获得的去除率相当。对从CUSA和我们的电动装置收集的碎片的粒度分析表明，在0.5微米＜d＜250微米的范围内，粒度分布相似。
