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Microwave ablation needle with antenna assembly

A microwave ablation and antenna assembly technology, applied in the field of medical equipment, can solve the problems of the choke ring suppressing the performance of surface current, the radiation performance of the monopole antenna, and the unclear development of zirconia ceramics, etc., so as to facilitate clinical treatment and improve the Bandwidth, effect of mitigation

Pending Publication Date: 2018-06-26
CANYON MEDICAL INC
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The change in the dielectric properties of the tissue leads to a decrease in the performance of the choke ring in suppressing the surface current.
[0007] (2) Changes in the near-field environment of the antenna lead to a sharp decline in the radiation performance of the monopole antenna, and most of the microwave energy will be consumed in the transmission line in the form of standing waves
However, zirconia ceramics are not clearly developed under ultrasound, which limits the clinical application of microwave ablation needles.
[0009] The performance of a typical monopole antenna is particularly sensitive to the length of the antenna pole. The reduction of the antenna size will lead to a decrease in the radiation resistance of the antenna, a decrease in efficiency, and a narrower frequency band

Method used

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  • Microwave ablation needle with antenna assembly
  • Microwave ablation needle with antenna assembly
  • Microwave ablation needle with antenna assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] Such as figure 1 , a microwave ablation needle with an antenna assembly provided in this embodiment, including a radiator and a needle bar 8 connected to the radiator, the radiator includes a needle head 1, a high temperature resistant insulating medium 2, a quasi-fractal part 3, and a medium loading part 4 , microwave cable 5, cable inner core 6, sleeve 7, needle bar 8, anti-stick coating 9, top loading part 10 and cooling channel 11, top loading part 10, quasi-fractal part 3, medium loading part 4 and microwave cable The inner core 6 of the cable 5 is electrically connected, and the sleeve 7 is electrically connected to the outer shielding layer of the microwave cable 5; Connect, use high-temperature ceramic glue for bonding, the glue can be high-temperature resistant epoxy glue, or inorganic high-temperature resistant glue, and the temperature resistance requirement should be above 200 °C. The cable includes a cable shielding layer 5a, an insulating medium layer 5b,...

Embodiment 2

[0068] The outer surface of the needle 1 can be machined and powder injection molded to process a semicircular groove with a radius of 0.01 mm to 0.1 mm in depth on the surface of the needle 1. The depth of the groove is related to the frequency and wavelength of the ultrasonic probe. The depth can be adjusted according to clinical application.

[0069] Such as Figure 2a and 2b , There is more than one groove 19 on the outside of the needle head 1, and the shape of the notch is a semicircular groove.

Embodiment 3

[0071] The outer surface of needle 1 can be processed by powder injection molding process, and the radius of 0.01mm~0.1mm can be processed on the surface of needle 1. Triangular grooves, triangular grooves are used to change the direction of ultrasonic reflection, and the depth of each triangular groove can be inconsistent. Adjust the size of the triangle angle, change the direction of ultrasonic reflection, reduce scattered ultrasonic waves, and increase the proportion of returned ultrasonic probe waves, thereby improving the effect of ultrasonic imaging.

[0072] Such as Figure 3a and 3b , the needle 1 is provided with more than one groove 20, and the shape of the notch is triangular.

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Abstract

The invention provides a microwave ablation needle with an antenna assembly. The microwave ablation needle comprises a radiator and a needle rod connected with the radiator, wherein the radiator comprises a needle head and an radiator antenna inside the needle head, the radiator antenna comprises a top-end loading part, medium loading parts and quasi-fractal parts, and the medium loading parts andthe quasi-fractal parts are alternately arranged; a microwave cable is arranged inside the needle rod, and comprises a cable inner core, and the cable inner core penetrates through the medium loadingparts and the quasi-fractal parts which are alternately arranged and the top-end loading part forwards. The part, arranged at the back end of the radiator antenna, of the microwave cable comprises acable shielding layer, and the front end of the cable shielding layer is sleeved with a high-temperature-resistance insulating medium.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a microwave ablation needle with an antenna assembly. Background technique [0002] In recent years, microwave ablation has become one of the important treatment methods for treating liver cancer, kidney cancer, thyroid and other soft tissues. Microwave ablation is to use antenna to radiate microwaves. Microwaves cause ions and polar water molecules in tissues to rotate, vibrate, and rub against each other to produce thermal effects, so that the treatment area can quickly reach a high temperature, and the tissues are coagulated, dehydrated and necrotic, so as to achieve the purpose of treatment. [0003] From the perspective of microwave antenna design, the mainstream ablation needles currently on the market adopt a typical monopole antenna structure, such as Chinese patents with publication numbers CN103142307A, CN104688335A and CN105816240A. [0004] The mainstream microwave a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B18/18
CPCA61B18/1815
Inventor 梁萍于晓玲冷德嵘董宝玮程志刚韩治宇于杰刘方义王卫中郑锐李常青
Owner CANYON MEDICAL INC
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