A surgical tool assembly (200") configured to be connected to a distal end of a bipolar surgical instrument having first and second electrical conductors (C 1 and C 2), the surgical tool assembly (200") comprising: a bipolar scissor comprising: a first blade (211a") having a first cutting edge and a first shearing blade surface; a second blade (211b") having a second cutting edge and a second shearing blade surface; each of the first and second blades (211a", 211b") comprising a non-conductive material, the first blade (211a") having a first embedded electrode and the second blade (211b") having a second embedded electrode, the first and second electrodes (211a", 211b") being polar opposites of each other; an elongated connector (311") configured to electrically connect the first embedded electrode of the first blade (211a") to the first electrical conductor (C 1); and a blade support (221") configured to electrically connect the second embedded electrode to the second electrical conductor (C 2) including a pivot pin (260"), the first and second blades (211a", 211b") being configured to rotate about the pivot pin (260") so as to open and close, characterized in that the elongated connector (311") further comprises a spring (311s") provided at a distal end of the surgical tool assembly, the spring (311s") being configured to bias the first blade (211a") into contact with the second blade (311b") and electrically connect the first blade (211a") to the first electrical conductor (C 1). a bipolar scissor comprising: a first blade (211a") having a first cutting edge and a first shearing blade surface; a second blade (211b") having a second cutting edge and a second shearing blade surface; each of the first and second blades (211a", 211b") comprising a non-conductive material, the first blade (211a") having a first embedded electrode and the second blade (211b") having a second embedded electrode, the first and second electrodes (211a", 211b") being polar opposites of each other; an elongated connector (311") configured to electrically connect the first embedded electrode of the first blade (211a") to the first electrical conductor (C 1); and a blade support (221") configured to electrically connect the second embedded electrode to the second electrical conductor (C 2) including a pivot pin (260"), the first and second blades (211a", 211b") being configured to rotate about the pivot pin (260") so as to open and close, a first blade (211a") having a first cutting edge and a first shearing blade surface; a second blade (211b") having a second cutting edge and a second shearing blade surface; each of the first and second blades (211a", 211b") comprising a non-conductive material, the first blade (211a") having a first embedded electrode and the second blade (211b") having a second embedded electrode, the first and second electrodes (211a", 211b") being polar opposites of each other; an elongated connector (311") configured to electrically connect the first embedded electrode of the first blade (211a") to the first electrical conductor (C 1); and a blade support (221") configured to electrically connect the second embedded electrode to the second electrical conductor (C 2) including a pivot pin (260"), the first and second blades (211a", 211b") being configured to rotate about the pivot pin (260") so as to open and close, characterized in that the elongated connector (311") further comprises a spring (311s") provided at a distal end of the surgical tool assembly, the spring (311s") being configured to bias the first blade (211a") into contact with the second blade (311b") and electrically connect the first blade (211a") to the first electrical conductor (C 1).