Development of a Radio Knife Suppressing the Adhesion of Coagulated Blood

概要

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Radio knife is a common tool in surgery. However it has a severe issue that it strongly adheres to the human body frequently through the coagulation of blood and/or human tissues. In order to overcome this issue, we developed the new tip for the radio knife that has ability to reduce surface temperature by vibrating or cooling. It was conducted that the new tip was evaluated in the scratch test between the tips and coagulated blood on the radio knife tip. As a result, adhesion force for the vibrated tip decreased to 36% comparing to normal tip, and adhesion force for the cooled tip decreased to 17% comparing to normal tip. From the results of dropped blood on stainless steel at several heating temperature, adhesive force was low when the blood heated lower than 65°C, on the other hand, it was high when the blood heated higher than 80°C. To prevent the coagulation adheres on radio tip and to keep the ability of cutting, the temperature difference between radio knife tip surface and the vicinity is important.