Dual mode microwave tool for dielectric analysis and thermal ablation treatment of organic tissue

Abstract

A dual mode tool design to analyze organic tissue and locally perform thermal ablation treatment is presented. The tool is made of an array of split-ring resonators. It can operate on a sensing mode to track the relative dielectric changes from the organic tissue and on a treatment mode to perform thermal ablation at different input powers. The measurements were done with phantoms of human tissue. The tool is able to focus a hot spot of approximately 0.2mm with a temperature of 109 °C at an input power of 10W.

Planar Metamaterial Based Microwave Sensor Arrays for Biomedical Analysis and Treatment

“…For the structure with square rings the same procedure for the thermal analysis was made. The results of the thermal distribution for the structure with four square SRRs are similar as senn in [37]. The second ring was used for the ablation treatment and reached a temperature of 74 • C with an input power of 10 W. In Fig.…”

Evolution of a microwave instrument for analysis and thermal ablation of organic tissue

“…The second mode performs thermal ablation treatment when a malignancy is located. The design and fabrication of this dual mode tool have been presented in [3], [9] and a reduction in size is necessary for this final prototype so it can finally be included in a minimal invasive surgery tool. Once an abnormality is detected, the tool can change its operation mode by controlling the input frequency and power to heat the tissue at a particular location, i.e.…”

“…For future work, the effect of different types of malignant tissues with different sizes and locations within the healthy tissue can be addressed specially to proof that malignant tissue can heat faster than its healthy counterpart [5]. For these devices the measurements are done using the phantoms of human tissue and are presented in [3], [9]. One example is shown in Fig.…”

“…As a result, the temperature of the tissue in that area increases to a level adequate to perform thermal ablation. The devices presented here use between 1 to 12 SRRs (number of pixels), and are able to heat the tissue to a temperature of approximately 109 • C with an input power of 10 W [3], [4], [5]. The extent of ablated tissue offered by these devices is predominantly determined by the applied power and time [6].…”

“…Developed prototypes: a) One circular SRR, b) One square SRR, c) Three circular SRRs and d) Four square SRRs[3].…”