CN210204904U

CN210204904U - Semi-rigid microwave thermal coagulation antenna for intraluminal tissue of blood vessel

Info

Publication number: CN210204904U
Application number: CN201920547932.6U
Authority: CN
Inventors: Xingrui Yang; 杨兴瑞
Original assignee: Nanjing Great Wall Medical Equipment Co Ltd
Current assignee: Nanjing Great Wall Medical Equipment Co Ltd
Priority date: 2019-04-22
Filing date: 2019-04-22
Publication date: 2020-03-31
Anticipated expiration: 2029-04-22

Abstract

The utility model discloses half just type blood vessel intracavity tissue microwave thermal coagulation antenna, include: semi-cylindrical radiation head, medium pipe, semi-rigid coaxial cable and outer guide sleeve. The high-performance semi-rigid coaxial cable is used as a coaxial line for transmitting microwave energy, a spiral spring is sleeved on the outer surface of the high-performance semi-rigid coaxial cable and extends to the tail part of the antenna body, optical fibers for transmitting laser are arranged among the thread pitches of the spiral spring in parallel, and a laser emission point of the optical fibers is positioned at the front end of the antenna body close to the tail part of the outer conductor; the outer surfaces of the spiral spring and the optical fiber are sleeved with thin-wall tetrafluoride tubes. The utility model has the outstanding characteristics that: the antenna body has small diameter and low microwave transmission loss, adopts laser guide, adopts a spiral spring as heat insulation, enables the slender antenna body to have enough flexibility, and adopts a tetrafluoride tube with high self-lubricating property and insulating and heat-insulating properties as the outermost layer. Therefore, the utility model is especially unique in small diameter and excellent performance, and becomes another surgical tool for safe and effective microwave thermal coagulation treatment of the tissue in the human blood vessel cavity.

Description

Semi-rigid microwave thermal coagulation antenna for intraluminal tissue of blood vessel

Technical Field

The utility model relates to a semi-rigid microwave thermal coagulation antenna for intravascular tissue, which is applicable to the thermal coagulation ablation treatment of focuses such as varicose veins in human blood vessels and cavitary tracts and belongs to the field of medical microwave technology application.

Background

The microwave thermotherapy of the 20 th century is almost popularized to every domestic hospital, and with the development of modern imaging technology, the microwave thermotherapy and interventional therapy technology are rapidly developed. The microwave thermal coagulation technology of the tissue in the human body blood vessel cavity is taken as a typical technology, and is gradually formed into a branch of the field of microwave clinical application.

In clinical endovascular treatment, compared with other active heating modes, the microwave tissue thermal coagulation effect has the characteristics of high thermal efficiency, high temperature rise, uniform tissue heating, moderate thermal penetrability, unobvious short-time carbonization, easily-controlled thermal coagulation range and the like, and movable thrombus is not easily formed after thermal coagulation. Such as the "technique for treating varicose veins by intracavitary microwave closure" is gaining more and more promising results.

At present, the microwave thermal coagulation operation clinically used for the tissue in the blood vessel cavity is a fibrous microwave needle or a long probe microwave radiator, the coaxial line for transmitting the microwave is a semi-flexible line, and the outer conductor of the coaxial line is woven by a plurality of metal wires. In order to increase the stiffness of the slender needle body, at least one thin steel wire is added to be parallel to a semi-flexible wire in structure, so that the diameter of the needle body of the existing instrument is thicker, and the outer diameter is generally larger than 2.5 mm, thereby directly restricting the range of clinical application of the slender needle body.

Disclosure of Invention

The utility model discloses an overcome the not enough of current apparatus, provide a semi-rigid type blood vessel intracavity tissue microwave thermal coagulation antenna, not only microwave transmission characteristic is good, and the apparatus external diameter is little, makes it be applied to clinical blood vessel intracavity tissue microwave thermal coagulation treatment more safely effectively.

The utility model relates to a half just type blood vessel intracavity tissue microwave thermal coagulation antenna, include: semi-cylindrical radiation head, medium pipe, half just coaxial cable and outer guide pin bushing, its characterized in that: and the inner conductor of the semi-rigid coaxial cable is arranged in the cylindrical blind hole at the head and the tail of the semi-cylindrical cable, and is fixed by welding and pressure riveting. The medium tube is sleeved on the cylinder at the tail part of the radiation head and can be fixed by coating adhesive. The hole suit of outer guide pin bushing front end is on the circular bead excircle of dielectric tube afterbody, simultaneously its centre bore suit in on half just coaxial cable, adopt gas tightness welded fastening to the two contact site, constitute from this the utility model discloses the field source structure of front end radiation electromagnetic wave (microwave) makes its antenna performance stable, and simple structure is reasonable, easily controls the microwave ablation scope of tumour tissue.

The utility model discloses a further characteristic as follows:

1. the semi-cylindrical head-shaped radiation head is made of a metal material made of copper or stainless steel, and the surface of the semi-cylindrical head-shaped radiation head is coated with Teflon, so that the radiation head has high self-lubricating property and does not damage the inner wall of a blood vessel.

2. The outer surface of the semi-rigid coaxial cable is sleeved with a spiral spring extending to the tail part of the antenna body, and the spiral spring is in loose fit with the semi-rigid coaxial cable. The gap between the two is preferably kept for relative bending movement. The spiral spring is made of special stainless steel wires in a winding mode, and has certain flexibility after heat treatment.

3. The outer circular surface of the shoulder of the outer guide sleeve is provided with an axial groove for embedding a steel wire at the front end of the spiral spring, and then the outer guide sleeve and the spiral spring are fastened and fixed by soldering tin in a mechanical riveting mode.

4. And an optical fiber for transmitting laser is wound between the pitches of the spiral springs and extends to the tail of the antenna body, and a laser indication light spot of the optical fiber is positioned at the front end of the antenna close to the tail of the outer guide sleeve or close to the tail of the outer conductor.

5. And a polytetrafluoroethylene tube or a thermoplastic polytetrafluoroethylene tube is sleeved on the outer circle of the shoulder of the outer guide sleeve, the spiral spring and the outer surface of the optical fiber to the tail part of the antenna body.

6. The thin-wall tetrafluoro tube is fixed on the outer cylindrical surface of the outer guide sleeve shoulder by adopting a steel wire hose clamp or a steel wire binding mode, and therefore, an annular groove is formed in the outer cylindrical surface of the outer guide sleeve shoulder, and the possibility that the thin-wall tetrafluoro tube and the outer guide sleeve are fastened without axial movement is guaranteed.

7. And a radio frequency connector is welded at the tail part of the semi-rigid coaxial cable to feed microwave energy, wherein the semi-rigid coaxial cable and the inner conductor and the outer conductor of the radio frequency connector are respectively firmly welded without forming a short circuit.

8. The length of the spiral spring and the thin-wall tetrafluoro sleeve is 10-15 mm shorter than that of a half-rigid coaxial cable, so that free bending of the antenna body is not interfered.

9. The tail part of the optical fiber is arranged in an inner hole of the laser adapter and is firmly bonded.

10. The tail of the antenna body is provided with a handle, the handle is composed of a handle seat and a handle pipe, the radio frequency connector is arranged in a center hole of the handle seat in an aligned mode and is firmly bonded, the laser adapter is arranged in a side hole of the handle seat in an aligned mode, and the handle pipe is bonded or clamped and fixed with the handle seat from the front end of the antenna body in a sleeved mode.

To sum up, the utility model discloses an outstanding characterized in that: (1) the semi-cylindrical radiation head and the Teflon coated on the surface have high self-lubricating property and do not hurt blood vessels. (2) Compared with the prior woven coaxial line of fiber microwave, the coaxial line adopting the semi-rigid coaxial cable for microwave transmission has the advantages of improving the flexibility of the antenna body and effectively reducing the microwave transmission loss and the heat productivity. (3) Wrap up the coil spring outside half rigid coaxial cable, not only further strengthened the utility model discloses the flexibility degree of the antenna body, and play thermal-insulated and half rigid coaxial cable heat of buffering effectively and to outlying radiation, compare with current fibrous microwave needle, the one deck thermal insulation material more. (4) The fine optical fiber is arranged between the screw pitches of the spiral spring without increasing the external diameter of the antenna body, and transmits laser indicating light to the position of the front end of the antenna body close to the tail part of the outer guide sleeve, so that the target position of the tissue in the microwave thermal coagulation blood vessel cavity can be identified. (5) The thin-wall tetrafluoride tube on the outermost layer of the antenna body not only insulates heat for the antenna body, but also has high self-lubricating property, and is beneficial to free sliding in blood vessels. (6) The utility model discloses compact structure has reduced its line external diameter size effectively.

In short, the present invention provides a novel surgical instrument for microwave thermal coagulation treatment of tissue in the lumen of a blood vessel, which has excellent microwave transmission characteristics, a small diameter of an antenna body, and high flexibility.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of the front end of a microwave thermal coagulation antenna for semi-rigid intravascular tissue in the present embodiment.

Fig. 2 is a schematic structural diagram of the tail part of the microwave thermal coagulation antenna for semi-rigid intravascular tissue of the embodiment.

The numbers in the figures are as follows:

1-semi-cylindrical radiation head, 2-medium tube, 3-semi-rigid coaxial cable, 4-outer guide sleeve, 5-steel wire hoop, 6-thin-wall tetrafluoride tube, 7-optical fiber, 8-spiral spring, 9-handle tube, 10-radio frequency connector, 11-handle seat, 12-laser adapter and 13-axial retainer ring.

Detailed Description

Example one

Fig. 1 and 2 show the front and rear end structures of the microwave thermosetting antenna for semi-rigid intraluminal tissue according to the first embodiment. The antenna of the embodiment comprises the following components: the device comprises a semi-cylindrical radiation head 1, a medium pipe 2, a semi-rigid coaxial cable 3, an outer guide sleeve 4, a steel wire hoop 5, a thin-wall tetrafluoride pipe 6, an optical fiber 7, a spiral spring 8, a handle pipe 9, a radio frequency connector 10, a handle seat 11, a laser adapter 12 and a shaft retainer ring 13.

As shown in fig. 1, the inner conductor of the semi-rigid coaxial cable 3 is installed in the cylindrical blind hole at the tail part of the radiation head 1 and fixed; the medium tube 2 is sleeved on the cylinder at the tail part of the radiation head 1 and fixed; the inner hole at the front end of the outer guide sleeve 3 is sleeved on the outer circle of the circular bead at the tail part of the medium tube 2, and the central hole is sleeved on the semi-rigid coaxial cable 2, and the contact part of the two is fixed by air-tight welding. The half rigid coaxial cable 3 is sleeved with a spiral spring 8 extending to the tail part of the antenna, and the spiral spring 8 is in loose fit with the half rigid coaxial cable 3. The front end of the spiral spring 8 is fixed with the outer guide sleeve 4. Specifically, in this embodiment, an axial groove is formed at the tail of the outer guide sleeve 4, and the steel wire at the front end of the coil spring 8 is embedded into the axial groove, and is riveted by mechanical force and fixed by soldering tin, so that the outer guide sleeve 4 and the coil spring 8 form a fastening connection. An optical fiber 7 for transmitting laser is wound between the pitches of the spiral spring 8, the optical fiber 7 extends to the tail part of the antenna body, and in the embodiment, the laser indication light point of the optical fiber 7 is close to the tail part of the outer conductor. The laser of the optical fiber 7 indicates the position of the light spot close to the tail of the outer guide sleeve, so as to be beneficial to marking the target position of the tissue in the microwave thermal coagulation blood vessel cavity. The thin-wall tetrafluoride tube 6 is sleeved outside the spiral spring 8, the optical fiber 7 and the outer guide sleeve 4, and the thin-wall tetrafluoride tube 6 is fixed on the outer guide sleeve 4. In this embodiment, the outer circumferential surface of the outer guide sleeve 4 is provided with an annular groove, and the front end of the thin-walled tetrafluoro pipe 6 is clamped into the annular groove by a steel wire clamp to fix the thin-walled tetrafluoro pipe 6. The length of the spiral spring 7 and the thin-wall tetrafluoride tube 6 is 10-15 mm shorter than that of a semi-rigid coaxial cable, and the free bending of the antenna body is preferably not interfered

As shown in fig. 2, the tail of the antenna body is assembled with a handle, the handle is composed of a handle seat 11 and a handle tube 9, a radio frequency connector 10 is installed in the central hole of the handle seat 11 in an aligned mode and is firmly bonded, a laser adapter 12 is installed in the side hole of the handle seat 11 in an aligned mode, the handle tube 9 is sleeved at the front end of the antenna body and is fixedly bonded with the handle seat 11 (or fixed in a clamping mode), and the tail of the optical fiber 7 is installed in the laser adapter 12.

The assembly process of the antenna front end structure of the embodiment is as follows:

firstly, the inner conductor of the semi-rigid coaxial cable 3 is arranged in the blind hole of the cylinder at the tail part of the semi-cylindrical radiation head 1, and is fixed by welding and pressure riveting. Then, the medium tube 2 is sleeved on the cylinder at the tail part of the radiation head 1, the matching surface can be coated with adhesive for fixation, the outer guide sleeve 4 is sleeved on the outer circle of the shoulder at the tail part of the medium tube 2, the matching surface can be coated with adhesive for fixation, meanwhile, the central hole of the outer guide sleeve 4 is sleeved on the surface of the outer conductor of the semi-rigid coaxial cable 3, and the contact part of the two is fixed by air-tight welding. Thus, the assembly and assembly welding of the field source structure radiating electromagnetic waves at the front end of the present embodiment are completed.

Then, the coil spring 8 is sleeved along the tail part of the semi-rigid coaxial cable 3 and is abutted to the outer guide sleeve 4

At the tail end, a steel wire at the end face of the spiral spring 8 is bent to 90 degrees, then the steel wire is clamped into an axial groove on the outer circular surface of the shoulder of the outer guide sleeve 4, and is riveted and fixed on the outer guide sleeve by mechanical force and then welded. Note that: the length of the coil spring 8 reaches the front end face of the radio frequency connector 10 at the tail part of the antenna body.

Then, the optical fiber 7 is wound from the tail of the outer guide sleeve 4 to the tail of the antenna body along the outer surface of the semi-rigid coaxial cable 3 between the thread pitches of the coil spring.

And finally, aligning and sleeving the thin-wall tetrafluoride tube 6 to the outer circle of the shoulder of the outer guide sleeve 4 from the tail part of the antenna body along the outer surfaces of the optical fiber 7 and the spiral spring 8, and then firmly clamping the thin-wall tetrafluoride tube 6 in the radial ring groove by using the steel wire clamp 5 to the radial ring groove positioned in the outer guide sleeve 4.

And assembling the front-end part of the microwave thermal coagulation antenna for the semi-rigid intravascular tissue.

The assembly process of the antenna rear end structure of the embodiment is as follows:

firstly, the inner conductor and the outer conductor of the semi-rigid coaxial cable 3 are respectively welded firmly on the inner conductor and the outer conductor of the radio frequency connector 10, short circuit is avoided, and welding of a base body of the radio frequency connector 10 is completed.

Then, the tail end of the optical fiber 7 is inserted into the central hole of the laser adapter 12 and firmly bonded.

Then, the radio frequency connector 10 at the tail part of the antenna body is aligned and arranged in a central hole of the handle seat 11 and is firmly bonded, the laser adapter 12 is aligned and arranged in a side hole of the handle seat 11, and the shaft retainer ring 13 is clamped in a radial annular groove of the laser adapter 12, so that the axial transmission of the laser adapter 12 to the handle seat 9 is prevented.

Finally, the handle tube 9 is sleeved along the front end of the antenna body (radiation head) and is fixedly bonded with the seam of the handle seat 11.

So far, the assembly of the microwave thermal coagulation antenna rear end part of the semi-rigid blood vessel inner tissue of the utility model is completed.

The microwave performance test and the load test results of the antenna of the embodiment are as follows:

the vector network analyzer is used for testing, and the voltage standing wave ratio of the sample piece in the embodiment of the utility model under the no-load state is 2.6 < 3.0 (ministered standard); the ideal effect is achieved in the test of thermal solidification of gelatin by microwave and the voltage standing wave ratio of 1.3 < 1.5 (ministered standard) under the load state.

The performance indexes and test results prove that: the utility model discloses can be applicable to the microwave thermal coagulation operation of organizing in the vascular chamber safely effectively to with the characteristics that its apparatus external diameter is little, antenna body flexibility is good and microwave transmission performance is good, become in this microwave technology application field outstanding person.

In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims

1. The utility model provides a half just microwave thermosetting antenna of blood vessel intraluminal tissue, has radiation head, dielectric tube, half just coaxial cable and outer guide pin bushing, its characterized in that: the semi-rigid coaxial cable is sleeved with a spiral spring extending to the tail part of the antenna, the front end of the spiral spring is fixed with the outer guide sleeve, an optical fiber for transmitting laser is wound between the screw pitches of the spiral spring and extends to the tail part of the antenna body, and a laser indication light spot of the optical fiber is positioned at the front end of the antenna and close to the tail part of the outer guide sleeve.

2. The semi-rigid endovascular tissue microwave thermal coagulation antenna of claim 1, wherein: the spiral spring is in loose fit with the semi-rigid coaxial cable.

3. The semi-rigid endovascular tissue microwave thermal coagulation antenna of claim 1, wherein: the outer tube is sleeved outside the spiral spring, the optical fiber and the outer guide sleeve.

4. The semi-rigid endovascular tissue microwave thermal coagulation antenna of claim 3, wherein: the front part of the outer tube is fixed on the outer guide sleeve in a steel wire throat hoop or steel wire binding mode.

5. The semi-rigid endovascular tissue microwave thermal coagulation antenna of claim 3, wherein: the outer circle surface of the outer guide sleeve is provided with an annular groove, and the front end of the outer tube is clamped into the annular groove through the steel wire clamp to fix the outer tube.

6. The semi-rigid endovascular tissue microwave thermal coagulation antenna according to any one of claims 3-5, wherein: the outer tube is a polytetrafluoroethylene tube.

7. The semi-rigid endovascular tissue microwave thermal coagulation antenna of claim 1, wherein: the tail part of the outer guide sleeve is provided with an axial groove, a steel wire at the front end of the spiral spring is embedded into the axial groove, and the outer guide sleeve and the spiral spring are fastened and connected in a mode of mechanical force riveting and soldering tin fixing.

8. The semi-rigid endovascular tissue microwave thermal coagulation antenna of claim 7, wherein: the antenna body afterbody is equipped with the handle, and the handle comprises handle seat and handle pipe, and the radio frequency connector counterpoint is packed into the centre bore of handle seat and is bonded firmly, and the laser adapter counterpoints and packs into the side hole of handle seat in, and the handle pipe bonds or the joint is fixed from antenna body front end encapsulation and handle seat, the laser adapter is packed into to optical fiber's afterbody.

9. The semi-rigid endovascular tissue microwave thermal coagulation antenna of claim 1, wherein: the inner conductor of the semi-rigid coaxial cable is arranged in the cylindrical blind hole at the tail part of the radiation head and is fixed; the medium tube is sleeved on the cylinder at the tail part of the radiation head and fixed; the inner hole at the front end of the outer guide sleeve is sleeved on the outer circle of the shoulder at the tail part of the medium tube, and the central hole of the outer guide sleeve is sleeved on the semi-rigid coaxial cable and the contact part of the semi-rigid coaxial cable and the semi-rigid coaxial cable is fixed by air-tight welding.

10. The semi-rigid endovascular tissue microwave thermal coagulation antenna of claim 6, wherein: the length of the spiral spring and the length of the outer pipe are both 10-15 mm shorter than that of the semi-rigid coaxial cable.