Having a holding portion having a pair of holding members for clamping the tissueThe target tissue is held by the clamping portion, andIt is used for medical devices for heating and treating the target tissue which is held.A thermally conductive sheet for conducting heat to at least one of the above described retaining members in contact with the target tissueContains a crosslinking material of silicone and a thermally conductive filler.Compressive stress and strain in the thickness direction were measured at 200 ℃.In the stress strain curve obtained based on the obtained measured valueThe inflection point is not detected in the region of the compression stress of 1 MPa or less.Heat conductive sheet.生体組織を挟持するための一対の保持部材を備えた挟持部を有し、上記挟持部で標的生体組織を挟持するとともに、挟持した標的生体組織を加熱して処理する医療用デバイスに用いられ、少なくとも一方の上記保持部材における上記標的生体組織との接触部位に熱を伝導するための熱伝導性シートであって、シリコーンの架橋物及び熱伝導性フィラーを含有し、厚さ方向における圧縮応力とひずみ量とを２００℃で測定し、得られた測定値に基づいて取得した応力－ひずみ曲線において、上記圧縮応力が１ＭＰａ以下の領域に変曲点が検出されない、熱伝導性シート。
