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.
Key words
electrosurgical unit;304 stainless steel;tungsten;tissue sticking;binding strength
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