高频电刀电凝模式下304不锈钢和钨两种电极表面的组织粘附行为

为探索电极材料熔点对电极表面组织粘附的影响,采用不同熔点的电极材料(304不锈钢和钨)对离体猪肝脏组织进行电切割试验,研究了电凝模式下电极表面的组织粘附行为。结果表明,在电切割过程中,低熔点的304不锈钢电极表面发生显微熔融、导致电极表面粗糙化,电极基体元素在粘附组织-电极界面出现扩散,粘附组织结合强度大于4.11 MPa;而高熔点的钨电极表面形态无明显变化,电极基体元素在粘附组织-电极界面没有出现扩散,粘附组织结合强度约1.65 MPa。进一步研究发现,钨电极表面粗糙度越大,粘附组织的结合强度越大,这间接证实电切割过程中304不锈钢电极表面显微熔融导致的表面粗糙化是其表面粘附组织结合强度明显大于钨电极的主要原因之一。可见,采用高熔点的电极材料能够避免电极表面显微熔融,从而减轻电极表面的组织粘附。

Tissue Sticking Behaviors on the Surfaces of 304 Stainless Steel and Tungsten Electrodes in Electrosurgical Unit Under a Coagulation Mode

In this paper, the tissue sticking behaviors on 304 stainless steel and tungsten active electrodes under a coagulation mode were investigated and compared to explore the effect of the melting point of electrodes using a self-designed electrosurgical unit testing device. Ex vivo porcine liver was used as a tissue sample. The results show that due to low melting point, 304 stainless steel electrode surface changes from smooth to uneven as a result of micro-melting during the cutting test, and the element Fe in 304 stainless steel is found to diffuse into the stuck tissue. The binding strength of the stuck tissue is more than 4.11 MPa. For the tungsten electrode with a high melting point, neither obvious changes in the surface morphology nor the diffusion of element W into the stuck tissue upon electrode occurres during the cutting process. The binding strength of the stuck tissue-tungsten electrode interface is about 1.65 MPa. Additionly, the bigger the surface roughness of tungsten electrode samples is, the higher the binding strength of the stuck tissue-tungsten electrode interface is. Thus, it can be inferred that the surface roughening of 304 stainless steel electrode due to micro-melting contributes to the high binding strength of the stuck tissue on its surface. To utilize electrode materials with high melting point can help prevent the electrode surface from micro-melting, and alleviate the tissue sticking upon electrode surface.