CN210019637U - Magnetic compatible dipole microwave ablation needle - Google Patents
Magnetic compatible dipole microwave ablation needle Download PDFInfo
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- CN210019637U CN210019637U CN201822025503.0U CN201822025503U CN210019637U CN 210019637 U CN210019637 U CN 210019637U CN 201822025503 U CN201822025503 U CN 201822025503U CN 210019637 U CN210019637 U CN 210019637U
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Abstract
The utility model discloses a magnetic compatible dipole microwave ablation needle, all parts of which are made of non-magnetic materials, and can be safely used for microwave ablation minimally invasive intervention operation under the guidance of magnetic resonance imaging, magnetic resonance has no ionizing radiation to human body, imaging quality is good, and operation success rate can be effectively improved; simultaneously, this scheme adopts the dipole design, effectively eliminates the remaining heat problem of needle tubing afterbody among the ablation process, obtains spherical ablation region, but maximum efficiency ablation tumour alleviates the damage to human normal tissue among the operation process to this structure easily makes, can conveniently realize.
Description
Technical Field
The utility model relates to the technical field of medical equipment, concretely relates to magnetism compatible circular microwave needle that melts of treatment tumour.
Background
The minimally invasive interventional operation has small wound on patients and quick recovery, and is accepted by the majority of patients. Among them, image-guided microwave ablation is a minimally invasive interventional operation for effectively treating tumors. In most of the existing tumor microwave ablation, a microwave ablation needle is percutaneously punctured into the central area of focal tissue of a human body under the guidance of CT or ultrasound, and microwave is radiated from the front end of the microwave ablation needle to continuously heat peripheral tissue to above 52 ℃, so that the tissue is coagulated and necrotized.
However, the use of CT as image guidance during surgery has ionizing radiation to the patient and the doctor, which is a major hazard; the resolution of the ultrasonic image is low, which is not beneficial to judging the edge of the tumor area. The magnetic resonance image guidance technology can overcome the defects of CT and ultrasound, and has various advantages, such as: no ionizing radiation, high image resolution, high soft tissue contrast, multi-aspect imaging and the like. However, the microwave ablation needle is required to have magnetic compatibility in the magnetic resonance environment, and most of the existing microwave ablation needles do not meet the requirements, so that the development of the tumor microwave ablation guided by the magnetic resonance is limited.
Secondly, the tumour tissue is generally approximately spherical and in order to kill tumour tissue with maximum efficiency without damaging normal tissue, the radiation area of the microwave needle should be approximately spherical. However, the existing microwave ablation needle does not meet the requirement, and the ablation area is mostly in a long ellipsoid shape.
In conclusion, it is an urgent need to solve the problem of designing a microwave ablation needle which can be safely used under magnetic resonance and can generate a spherical ablation area.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a magnetic compatibility's dipole microwave ablation needle solves above-mentioned technical problem. The magnetic resonance ablation device can be safely used under magnetic resonance, and a spherical ablation shape can be obtained.
In order to achieve the above object, the utility model provides a following technical scheme:
a magnetically compatible dipole microwave ablation needle comprising: the needle comprises a needle head, a needle tube, a coaxial cable, a metal column and a metal ring;
the coaxial cable comprises an inner conductor, an outer conductor and an intermediate insulating layer;
the metal column is arranged in the hollow middle of the needle head, is connected to the inner conductor and serves as one end of the dipole microwave ablation needle;
the tail of the needle is a needle step, the needle tube is sleeved on the coaxial cable and the needle step, the outer wall of the needle step is fixed with the inner wall of the needle tube, the metal ring is sleeved between the coaxial cable and the needle tube, and the metal ring is used for conducting the outer conductor and the needle tube, so that the section of the needle tube fixed by the needle tube and the needle step is used as the other end of the dipole microwave ablation needle.
Preferably, the length of the needle step is one quarter of the effective wavelength:
wherein c is the wave velocity in vacuum, f is the microwave frequency used, E isrIs the relative dielectric constant of the wave-transmitting medium.
Preferably, the material of the needle is non-magnetic.
Preferably, the needle tube is made of a non-magnetic metal conductive material.
Preferably, the outer wall of the needle tube is provided with a non-adhesive structure.
Preferably, the coaxial cable is a non-magnetic cable; the front end of the outer conductor is stripped to expose the insulating layer, and the front end of the insulating layer is stripped to expose the inner conductor.
Preferably, the metal column is cylindrical, and is perforated at one end and welded to the inner conductor seamlessly.
Preferably, the metal column is made of nonmagnetic conductive metal, and the metal ring is made of nonmagnetic conductive metal.
Preferably, the method further comprises the following steps: the radio frequency connector is welded at the tail part of the coaxial cable, and the handle wraps the radio frequency connector.
Preferably, the radio frequency connector is made of a non-magnetic metal conductive material.
According to the above technical scheme, the utility model provides a magnetic compatibility's dipole microwave ablation needle, its beneficial effect who brings is:
1. all parts are made of non-magnetic materials, can be safely used for microwave ablation minimally invasive interventional surgery under the guidance of magnetic resonance imaging, has no ionizing radiation to a human body due to magnetic resonance, has good imaging quality, and can effectively improve the success rate of the surgery;
2. by adopting the dipole design, the problem of waste heat at the tail part of the needle tube in the ablation process is effectively eliminated, a spherical ablation area is obtained, tumors can be ablated with maximum efficiency, the damage to normal tissues of a human body in the operation process is reduced, and the structure is easy to manufacture and can be conveniently realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a magnetic-compatible dipole microwave ablation needle according to an embodiment of the present invention.
Wherein, 1 is a needle head, 1-1 is the middle part of the needle head, and 1-2 is a step of the needle head; 2 is a needle tube; 3-1 is a coaxial cable inner conductor, 3-2 is a coaxial cable insulating layer, and 3-3 is a coaxial cable outer conductor; 4 is a metal column, 5 is a metal ring, 6 is a radio frequency connector, and 7 is a handle.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides a magnetic compatibility's dipole microwave ablation needle, include: the structure of the needle comprises a needle head 1, a needle tube 2, a coaxial cable, a metal column 4 and a metal ring 5, which can be seen in figure 1;
the coaxial cable comprises an inner conductor 3-1, an outer conductor 3-3 and a middle insulating layer 3-2;
the metal column 4 is arranged in the hollow middle part of the needle head 1, and the metal column 4 is connected to the inner conductor 3-1 and serves as one end of the dipole microwave ablation needle; the needle head 1 is made of insulating materials;
the tail part of the needle 1 is provided with a needle step 1-2, the needle tube 2 is sleeved on the coaxial cable and the needle step 1-2, and the outer wall of the needle step 1-2 is fixed with the inner wall of the needle tube 2, so that the assembly is convenient; the metal ring 5 is sleeved between the coaxial cable and the needle tube 2, and the metal ring 5 is used for conducting the outer conductor 3-3 and the needle tube 2, so that the section of the needle tube fixed by the needle tube 2 and the needle head step 1-2 is used as the other end of the dipole microwave ablation needle.
According to the technical scheme, the embodiment of the utility model provides a compatible dipole microwave ablation needle of magnetism adopts the dipole design, effectively eliminates to melt in-process needle tubing afterbody waste heat problem, obtains the spherical region of melting, but the tumour is melted to the maximum efficiency, alleviates the damage to the normal tissue of human body in the operation process to this structure easily makes, can conveniently realize.
Specifically, the length of the needle step 1-2 is one-quarter of the effective wavelength:
wherein c is the wave velocity in vacuum, f is the microwave frequency used, E isrIs the relative dielectric constant of the wave-transmitting medium. So set up to optimize the dipole structure of this scheme, more effectively eliminate and melt the in-process needle catheter tail waste heat problem, obtain the spherical region of melting of ideal.
In order to further optimize the technical scheme, the needle head 1 is made of non-magnetic materials, can be safely used for microwave ablation minimally invasive interventional surgery guided by magnetic resonance imaging, has no ionizing radiation to a human body due to magnetic resonance, has good imaging quality, and can effectively improve the success rate of the surgery. Similarly, the needle tube 2 is made of non-magnetic metal conductive material, such as copper tube, titanium alloy tube, etc.; the coaxial cable 3 is a non-magnetic cable; the metal column 4 is non-magnetic conductive metal, such as copper, silver and the like; the metal ring 5 is made of nonmagnetic conductive metal such as copper and silver.
In this embodiment, the outer wall of the needle tube 2 has a non-adhesive structure to prevent the surface of the needle tube from adhering to the tissue during ablation. Specifically, the non-stick structure is a layer of Teflon coating sprayed on the surface of the non-stick structure.
Preferably, the front end of the outer conductor 3-3 of the coaxial cable 3 is stripped to expose the insulating layer 3-2, and the front end of the insulating layer 3-2 is stripped to expose the inner conductor 3-1 for contact matching with other corresponding parts, and the structure can be seen in fig. 1.
Specifically, the metal column 4 is cylindrical, and one end of the metal column is perforated and welded with the inner conductor 3-1 in a seamless mode, so that the metal column and the inner conductor are fully matched, and the metal column can be better used as one end of a dipole microwave ablation needle.
The embodiment of the utility model provides a magnetic compatibility's dipole microwave ablation needle still includes:
the radio frequency connector 6 is welded at the tail part of the coaxial cable and is used for being connected with an external microwave ablation instrument;
and a handle 7 for wrapping the radio frequency connector 6 for the convenience of operation of a doctor, and the structure of the radio frequency connector can be seen in figure 1.
In order to further optimize the technical scheme, the radio frequency connector 6 is made of a non-magnetic metal conductive material, has magnetic compatibility and can be safely used for magnetic resonance guided tumor microwave ablation.
The present solution is further described below with reference to specific embodiments:
the embodiment of the utility model provides a pair of magnetic compatibility's dipole microwave ablation needle, include: the radio frequency connector comprises a needle head 1, a needle tube 2, a coaxial cable 3, a metal column 4, a metal ring 5, a radio frequency connector 6 and a handle 7. The front end outer conductor 3-3 of the coaxial cable 3 is stripped to expose the insulating layer 3-2, the front end of the insulating layer 3-2 is stripped to expose the inner conductor 3-1, and the inner conductor 3-1 and the metal column 4 are welded together in a seamless mode; the front end of the coaxial cable 3 is inserted into the needle head 1 to the bottom; the metal ring 5 is sleeved in the coaxial cable 3 to the tail end face of the needle head step 1-2; the needle tube 2 is sleeved with the coaxial cable 3 to the front end face of the needle head step 1-2, and the needle head step 1-2 is fixed with the inner wall of the needle tube 2; the radio frequency connector 6 is welded at the tail part of the coaxial cable 3 and is used for being connected with an external microwave ablation instrument; the handle 7 wraps the radio frequency connector 6, so that the operation of a doctor is facilitated.
Preferably, the needle head 1 is made of nonmagnetic and hard materials such as zirconia materials; the front part of the needle head 1 is in a solid conical shape, so that the puncture is convenient; the middle part of the needle head is a 1-1 hollow cylinder, the outer diameter of the needle head is the same as the outer diameter of the needle tube 2, the inner diameter of the needle head is slightly larger than the outer diameter of the metal column 4, and the length of the needle head is larger than the length of the metal column 4; the tail of the needle head 1 is a needle head step 1-2, the outer diameter is slightly smaller than the inner diameter of the needle tube 2, the inner diameter is slightly larger than the diameter of the metal column 4, the length is one fourth of the effective wavelength, and the effective wavelength is as follows:
wherein c is the wave velocity in vacuum, f is the microwave frequency used, E isrIs the relative dielectric constant of the wave-transmitting medium.
Preferably, the needle tube 2 is made of a non-magnetic metal conductive material, such as a copper tube or a titanium alloy tube, and a layer of Teflon coating is sprayed on the surface of the needle tube 2 to prevent the surface of the needle tube from being adhered with tissues in the ablation process.
Preferably, the coaxial cable 3 is a nonmagnetic cable and comprises an inner conductor 3-1, an insulating layer 3-2 and an outer conductor 3-3, and the diameter of the coaxial cable is equal to that of the metal column 4.
Preferably, the metal column 4 is made of nonmagnetic conductive metal and can be made of copper, silver and the like, the metal column 4 is in a cylindrical shape, one end of the metal column is perforated, and the metal column is seamlessly welded with the coaxial cable inner conductor 3-1 and serves as one end of the dipole microwave ablation needle.
Preferably, the metal ring 5 is made of nonmagnetic conductive metal, such as copper, silver and the like, has an outer diameter slightly smaller than the inner diameter of the needle tube 2, has an inner diameter slightly larger than the diameter of the coaxial cable 3, and is used for conducting the coaxial cable outer conductor 3-3 and the needle tube 2, so that the section of the needle tube, where the needle tube 2 and the needle head step 1-2 are fixed, serves as the other end of the dipole microwave ablation needle, a spherical ablation area can be effectively generated by the microwave ablation needle, and the phenomenon that the normal tissue is burned by heat generated by radiation of the microwave along the.
Preferably, the radio frequency connector 6 is made of a non-magnetic metal conductive material.
To sum up, the parts of the magnetic compatible dipole microwave ablation needle provided by the utility model are all made of non-magnetic materials, and can be safely used for microwave ablation minimally invasive intervention operation under the guidance of magnetic resonance imaging, the magnetic resonance does not have ionizing radiation to human body, the imaging quality is good, and the success rate of the operation can be effectively improved; simultaneously, this scheme adopts the dipole design, effectively eliminates the remaining heat problem of needle tubing afterbody among the ablation process, obtains spherical ablation region, but maximum efficiency ablation tumour alleviates the damage to human normal tissue among the operation process to this structure easily makes, can conveniently realize.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A magnetically compatible dipole microwave ablation needle, comprising: the needle comprises a needle head (1), a needle tube (2), a coaxial cable, a metal column (4) and a metal ring (5);
the coaxial cable comprises an inner conductor (3-1), an outer conductor (3-3) and an intermediate insulating layer (3-2);
the metal column (4) is arranged in the hollow middle of the needle head (1), and the metal column (4) is connected to the inner conductor (3-1) and serves as one end of a dipole microwave ablation needle;
the tail of the needle head (1) is provided with a needle head step (1-2), the needle tube (2) is sleeved on the coaxial cable and the needle head step (1-2), the outer wall of the needle head step (1-2) is fixed with the inner wall of the needle tube (2), the metal ring (5) is sleeved between the coaxial cable and the needle tube (2), and the metal ring (5) is used for conducting the outer conductor (3-3) and the needle tube (2), so that the section of the needle tube fixed by the needle tube (2) and the needle head step (1-2) serves as the other end of the dipole microwave ablation needle.
2. A magnetically compatible dipole microwave ablation needle according to claim 1, wherein the length of the needle tip step (1-2) is one quarter of the effective wavelength:
wherein c is the wave velocity in vacuum, f is the microwave frequency used, E isrIs the relative dielectric constant of the wave-transmitting medium.
3. A magnetically compatible dipole microwave ablation needle according to claim 1, characterized in that the material of the needle head (1) is non-magnetic.
4. A magnetically compatible dipole microwave ablation needle according to claim 1, wherein the needle tube (2) is of a non-magnetic metallic conductive material.
5. A magnetically compatible dipole microwave ablation needle according to claim 1, wherein the outer wall of the needle tube (2) has a non-stick structure.
6. A magnetically compatible dipole microwave ablation needle according to claim 1, characterized in that the coaxial cable (3) is a non-magnetic cable; the front end of the outer conductor (3-3) is stripped to expose the insulating layer (3-2), and the front end of the insulating layer (3-2) is stripped to expose the inner conductor (3-1).
7. A magnetically compatible dipole microwave ablation needle according to claim 1, wherein the metal post (4) is cylindrical in shape and is perforated at one end and is seamlessly welded to the inner conductor (3-1).
8. A magnetically compatible dipole microwave ablation needle according to claim 1, wherein the metal post (4) is of a non-magnetic conductive metal and the metal ring (5) is of a non-magnetic conductive metal.
9. The magnetically compatible dipole microwave ablation needle of claim 1, further comprising: the radio frequency connector (6) is welded at the tail part of the coaxial cable, and the handle (7) wraps the radio frequency connector (6).
10. A magnetically compatible dipole microwave ablation needle according to claim 9, wherein the radio frequency connector (6) is of a non-magnetic metallic conductive material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822025503.0U CN210019637U (en) | 2018-12-04 | 2018-12-04 | Magnetic compatible dipole microwave ablation needle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822025503.0U CN210019637U (en) | 2018-12-04 | 2018-12-04 | Magnetic compatible dipole microwave ablation needle |
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| CN210019637U true CN210019637U (en) | 2020-02-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109330680A (en) * | 2018-12-04 | 2019-02-15 | 安徽大中润科技有限公司 | Magnetic compatible dipole microwave ablation needle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109330680A (en) * | 2018-12-04 | 2019-02-15 | 安徽大中润科技有限公司 | Magnetic compatible dipole microwave ablation needle |
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Effective date of registration: 20220309 Address after: 230000 building C5, national health big data Industrial Park, southwest corner of Xiyou road and kongtai Road, high tech Zone, Hefei, Anhui Province Patentee after: ANHUI SHUOJIN MEDICAL EQUIPMENT Co.,Ltd. Address before: 230088 Room 502, 5 / F, 34 Hehuan Road, high tech Zone, Hefei, Anhui Province Patentee before: Hefei Fusheng Medical Science and Technology Partnership (General Partnership) |