Microwave ablation needle head and microwave ablation needle

A microwave ablation needle head, comprising:

• an outer tube, wherein the outer tube comprises a first branch tube and a second branch tube provided sequentially in a direction from a distal end to a proximal end of the outer tube, and an end of the first branch tube away from the second branch tube forms a distal end of the outer tube, wherein a material of the first branch tube is a ceramic material or polymer material;
• a cooling tube, wherein the cooling tube is arranged in the outer tube, the cooling tube and the outer tube are spaced apart from each other, and a first cooling flow channel is formed between the cooling tube and the outer tube, wherein a material of the cooling tube is a polymer material;
• and a distal end of the cooling tube is located inside a distal end of the first branch tube to form a mounting space in a distal region of the cooling tube;
• a coaxial cable, wherein the coaxial cable is arranged in the cooling tube, the coaxial cable is spaced apart from the cooling tube, and a second cooling flow channel is formed between the cooling tube and the coaxial cable;
• and a distal end of the coaxial cable is located in the distal end of the cooling tube;
• and
• an electrode, wherein at least part of the electrode is located in the mounting space, and is electrically connected to the distal end of the coaxial cable;
• wherein the microwave ablation needle head further comprises a sensing element, which is arranged on an outer peripheral wall of the first branch tube, wrapped in a radiation area of the coaxial cable and configured to sense a part of radiation current of the coaxial cable to enhance a radiation capability;
• wherein the sensing element is spray-coated on the outer peripheral wall of the first branch tube, or wherein the sensing element is of tubulation, and the sensing element is sleeved over the outer peripheral wall of the first branch tube,
• wherein the sensing element is made of one of copper, iron, aluminum, gold, silver, palladium, platinum, tin, nickel, zinc and alloys thereof.