Treatment portion of medical energy device, manufacturing method therefor, and medical energy device

A medical energy device comprising a treatment portion that treats a biological tissue by transferring energy to the biological tissue, in a state where the treatment portion is in contact with the biological tissue, the treatment portion comprising:

• a main body portion that transfers the energy to the biological tissue;
• and a covering film that contains silicone as a main component and covers a surface of the main body portion,
• wherein the silicone includes at least a D unit, and
• wherein in the silicone, a molar ratio of silicon atoms forming the D unit with respect to all the silicon atoms is 40% or more and 99% or less, and
• wherein in the silicone, a molar ratio of methyl functional groups bonded to the silicon atoms with respect to all functional groups bonded to silicon atoms is 60% or more, and
• wherein the covering film has a film structure in which relatively soft portions comprising the silicone are interposed between relatively hard portions comprising a second silicone mainly composed of Q units, with the relatively soft portions containing a higher molar ratio of D units than the relatively hard.

A manufacturing method for a treatment portion of a medical energy device that treats a biological tissue by transferring energy to the biological tissue, in a state where the treatment portion is in contact with the biological tissue, the method comprising:

• preparing a main body portion and a coating liquid, the main body portion being for transferring the energy to the biological tissue, the coating liquid containing silicone including at least a D unit and a T unit and being a polymer in which a molar ratio of silicon atoms forming the D unit with respect to all the silicon atoms is 40% or more and 99% or less, and a molar ratio of methyl functional groups bonded to the silicon atoms with respect to all functional groups bonded to the silicon atoms is 60% or more;
• applying the coating liquid to a surface of the main body portion;
• and
• forming a covering film which contains the silicone as a main component and covers the surface of the main body portion by heating and curing the applied coating liquid and wherein the covering film has a film structure in which relatively soft portions comprising the silicone are interposed between relatively hard portions comprising a second silicone mainly composed of Q units, with the relatively soft portions containing a higher molar ratio of D units than the relatively hard.