Microwave ablation electrode

A microwave ablation electrode, comprising a main needle body, a working end of the main needle body is capable of releasing microwave energy to realize microwave ablation;

• a non-working end circulation cooling structure and a working end liquid injection structure are arranged on the main needle body, wherein;
• the non-working end circulation cooling structure is capable of allowing a refrigerant medium to reach a front end of a non-working end of the main needle body to cool the non-working end of the main needle body and surrounding tissues, and the non-working end circulation cooling structure is capable of allowing the refrigerant medium to flow back;
• the working end liquid injection structure is capable of allowing the refrigerant medium to reach the working end of the main needle body to cool the working end and the surrounding tissues, and is also capable of allowing the refrigerant medium to be injected into lesion tissues and absorb microwave energy to form steam, so that steam thermal ablation is realized;
• the main needle body comprises an inner needle tube, an outer needle tube, a reflecting ring, a coaxial semi-rigid wire and a working end needle body, the outer needle tube is sleeved on the inner needle tube, the inner needle tube is sleeved on the coaxial semi-rigid wire, the reflecting ring is sleeved on the coaxial semi-rigid wire, an inner wall of the reflecting ring is sealed with an outer wall of the coaxial semi-rigid wire, the reflecting ring is capable of sealing a front end of the inner needle tube, and the working end needle body is arranged at a front end of the outer needle tube;
• a front end of the coaxial semi-rigid wire is electrically connected with a transmitting antenna, a tail end of the coaxial semi-rigid wire is capable of being electrically connected with a microwave ablation host, and the transmitting antenna is located in the working end needle body;
• communicating gaps are arranged between the transmitting antenna and an inner wall of the working end needle body and between the front end of the coaxial semi-rigid wire and the inner wall of the working end needle body to form a working end flow channel, the working end flow channel communicates with the non-working end circulation cooling structure, micropores which allow the refrigerant medium to be injected into the lesion tissues are formed in the working end needle body, and the micropores communicate with the working end flow channel to form the working end liquid injection structure;
• an inner flow channel is formed between the inner needle tube and the coaxial semi-rigid wire, an outer flow channel is formed between the outer needle tube and the inner needle tube, a front end of the inner flow channel communicates with a front end of the outer flow channel, and a tail end of the inner flow channel and a tail end of the outer flow channel communicate with a liquid outlet port and a liquid return port of a liquid supply device, respectively to form the non-working end circulation cooling structure, the liquid supply device is capable of providing the refrigerant medium, and the outer flow channel communicates with the working end flow channel;
• a first gap is arranged between an outer wall of the reflecting ring and an inner wall of the outer needle tube, and a second gap is arranged between a front end face of the reflecting ring and a tail end face of the working end needle body, the first gap communicates with the outer flow channel, the second gap communicates with the working end flow channel, and the first gap communicates with the second gap to realize the communication between the working end flow channel and the outer flow channel;
• the first gap has a spacing of 0.05 mm to 0.2 mm, and the second gap has a spacing of 0.1 mm to 1.0 mm;
• and
• each of the micropores has a pore size of 50 μm to 200 μm.