Micro object of the present invention, coagulation, etc. of the living tissue surface can be reliably and easily, and in time of solidification or the like deep is inserted into the living body tissue is also the vicinity of the tip portion of the microwave surgical device can be sufficiently solidified such and it is to provide a wave surgical instrument. The present invention, at least a pair of rod-shaped electrodes are arranged to be parallel to the central axis of the entire electrode, paired between the electrodes, characterized in that is filled with an insulator bipolar needle microwave surgery We use the vessel. At least two pairs of electrodes are arranged alternately such that the electrode of the same polarity is not next to each other, of the paired electrodes, or distal ends of the same polarity of the electrode by bridges of the same material as the electrode and configured it is preferable. Each electrode is preferably in the vertical distance of 2mm from the central axis.本発明の目的は、生体組織表面の凝固等を確実かつ容易にでき、また、生体組織に挿入して深部を凝固等する際でも、マイクロ波手術器の先端部付近が十分に凝固等できるマイクロ波手術器を提供することである。本発明は、少なくとも一対の棒状電極が電極全体の中心軸と平行になるように配置され、対となる電極の間が絶縁体で満たされていることを特徴とする双極式針型マイクロ波手術器を用いる。少なくとも二対の電極が、同極の電極が隣り合わせにならないように交互に配置され、対となる電極のうち、いずれか同極の電極の先端部同士がこの電極と同じ材料で橋かけして構成されることが好ましい。各電極が、中心軸から2mmの垂直距離内にあることが好ましい。
