CN221243017U - Flexible microwave ablation catheter - Google Patents
Flexible microwave ablation catheter Download PDFInfo
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- CN221243017U CN221243017U CN202322586679.4U CN202322586679U CN221243017U CN 221243017 U CN221243017 U CN 221243017U CN 202322586679 U CN202322586679 U CN 202322586679U CN 221243017 U CN221243017 U CN 221243017U
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- flexible
- microwave
- tube
- capillary tube
- coaxial cable
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- 238000002679 ablation Methods 0.000 title claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 39
- 239000000919 ceramic Substances 0.000 claims abstract description 28
- 230000005855 radiation Effects 0.000 claims abstract description 21
- 239000004020 conductor Substances 0.000 claims abstract description 6
- 238000005452 bending Methods 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 210000003437 trachea Anatomy 0.000 abstract description 15
- 210000004072 lung Anatomy 0.000 abstract description 11
- 206010028980 Neoplasm Diseases 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 8
- 239000000498 cooling water Substances 0.000 description 12
- 230000003902 lesion Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 229920002614 Polyether block amide Polymers 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012567 medical material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 201000003144 pneumothorax Diseases 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 230000002980 postoperative effect Effects 0.000 description 1
- 230000002685 pulmonary effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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- Surgical Instruments (AREA)
Abstract
The utility model relates to a flexible microwave ablation catheter, which comprises an outer sleeve, a coaxial cable and a microwave antenna, wherein a capillary tube is coaxially sleeved on the outer side of the coaxial cable; the outer sleeve comprises a ceramic sleeve serving as a working end and a flexible outer tube fixedly connected with the ceramic sleeve; the coaxial cable is a flexible coaxial cable and is arranged in the flexible outer tube, and the capillary tube is a flexible capillary tube; the microwave antenna is arranged in the ceramic sleeve and is connected with the inner conductor of the flexible coaxial cable; and a metal shielding cover for enabling the microwave antenna to emit directionally is arranged in the outer sleeve. The utility model can lead microwave directional radiation to avoid the damage of normal tissues on the non-tumor side of the lung trachea.
Description
Technical Field
The utility model relates to a flexible microwave ablation catheter, and belongs to the technical field of medical appliances.
Background
The microwave ablation catheter can treat tumor lesions in and near the trachea of the lung of a human body, and because the ablation catheter is used for ablation at a position close to a tumor when the trachea wall or the tumor lesions near the trachea wall are ablated, the radiation area of the traditional ablation catheter is similar to a sphere, so that the tissue at one side of the non-tumor is damaged during ablation.
In addition, the traditional microwave ablation needle adopts a metal needle rod (rigid), and performs ablation through percutaneous puncture, and if a puncture mode is adopted for lung ablation, the problem of postoperative pneumothorax can possibly occur, so that a flexible microwave ablation catheter which enters the lung ablation through a natural cavity of a human body is gradually pushed out at present, and the flexible microwave ablation catheter can enter the lung ablation in cooperation with an endoscope or magnetic navigation and the like. However, because the core temperature of the microwave radiator is higher when the microwave radiator ablates by radiating microwave energy, the core temperature of the ablation area of the microwave radiator is higher than 150 ℃ generally, so that the medical catheter outside the radiator needs to resist the high temperature of more than 150 ℃, and when the common medical polymer flexible pipe body is adopted, the pipe body made of materials such as PU (polyurethane), PVC (polyvinyl chloride), pebax (polyether block polyamide) and the like cannot resist the high temperature exceeding the melting point of the pipe body, the pipe body begins to soften at 70-80 ℃, and the pipe body gradually melts as the temperature is continuously increased. After the tube body outside the microwave radiator is melted, the cooling water inside the tube body leaks. Thawing of the tube and leakage of cooling water during ablation procedures are extremely dangerous, which can cause fatal injury to the patient.
The tube body made of high-temperature resistant medical polymer plastic, such as PEEK (polyether ether ketone), PI (polyimide), PTFE (polytetrafluoroethylene) and the like, can avoid the heating and melting of the tube body of the microwave ablation catheter, but has high hardness, does not have flexible bending characteristics, and cannot rebound to the original shape once being bent, so that the radiation part cannot be clung to the focus position, and the normal operation of the lung tracheal ablation work is affected.
Disclosure of Invention
The utility model aims to solve the technical problems that: a flexible microwave ablation catheter is provided which can direct microwave radiation to avoid damage to normal tissues on the non-tumor side of the lung trachea.
In order to solve the technical problems, the technical scheme provided by the utility model is as follows: the flexible microwave ablation catheter comprises an outer sleeve, a coaxial cable and a microwave antenna, wherein a capillary tube is coaxially sleeved on the outer side of the coaxial cable;
the outer sleeve comprises a ceramic sleeve serving as a working end and a flexible outer tube fixedly connected with the ceramic sleeve; the coaxial cable is a flexible coaxial cable and is arranged in the flexible outer tube, and the capillary tube is a flexible capillary tube;
The microwave antenna is arranged in the ceramic sleeve and is connected with the inner conductor of the flexible coaxial cable;
And a metal shielding cover for enabling the microwave antenna to emit directionally is arranged in the outer sleeve.
According to the utility model, the metal shielding cover is arranged outside the microwave antenna, and the microwave energy emitted by the microwave antenna is radiated directionally under the action of the metal shielding cover, so that the damage to the normal tissue of the trachea at the other side of the lesion is avoided when the inner wall of the trachea of the lung or the lesion adjacent to the inner wall of the trachea are ablated.
In addition, in the prior art, for a microwave ablation catheter for a pulmonary trachea or a focus adjacent to the inner wall of the trachea, an integrated flexible outer tube is mostly adopted as an outer tube, namely, a flexible tube is adopted as a working end. The working end of the utility model replaces the flexible outer tube with the ceramic sleeve, and the bending property of the outer tube body is not affected because the ceramic sleeve (working end) is very short, so that the utility model is convenient for treating tumor focus in and adjacent to the trachea of the lung of a human body, and meanwhile, the working end (microwave radiation core area) of the ceramic sleeve can also resist high temperature, thus avoiding the problem of high-temperature softening of the outer tube body of the outer tube in the prior art, avoiding the leakage of cooling water on the inner side of the tube body caused by melting the tube body and reducing the harm to patients.
Drawings
The utility model is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of the present utility model.
Fig. 2 is a schematic cross-sectional view of fig. 1.
Fig. 3 is a schematic cross-sectional view taken along line A-A in fig. 2.
Fig. 4 is a schematic structural diagram of a second embodiment of the present utility model.
Fig. 5 is a schematic structural view of a third embodiment of the present utility model.
Reference numerals: 10. an outer sleeve; 11. a ceramic sleeve; 12. a flexible outer tube; 13. a microwave antenna; 14. a metal shield; 15. a temperature sensor; 16. an arc-shaped groove; 17. a radiation window; 18. a radiation area; 19. a microwave isolation layer; 20. a coaxial cable; 21. a flexible capillary tube; 30. a handle; 31. a water inlet pipe; 32. a water outlet pipe; 33. a microwave input interface; 34. a cooling water inlet channel; 35. and a cooling water outlet channel.
Detailed Description
Example 1
The embodiment relates to a flexible microwave ablation catheter, which comprises an outer sleeve 10, a coaxial cable 20 and a microwave antenna 13, wherein a capillary tube is coaxially sleeved on the outer side of the coaxial cable 20, and the capillary tube is made of flexible capillary tube 21, preferably flexible plastic. The outer sleeve 10 comprises a ceramic sleeve 11 serving as a working end and a flexible outer tube 12 fixedly connected with the ceramic sleeve 11. The coaxial cable 20 adopts a flexible coaxial cable 20, and the flexible coaxial cable 20 comprises an inner conductor, a middle shielding layer and an outer conductor and is arranged in the flexible outer tube 12; a cooling water inlet channel 34 is formed between the flexible capillary tube 21 and the flexible coaxial cable 20, and a cooling water outlet channel 35 is formed between the flexible capillary tube 21 and the outer sleeve 10.
The microwave antenna 13 is disposed within the ceramic sleeve 11 and is connected to the inner conductor of the flexible coaxial cable 20. In this embodiment, the flexible capillary tube 21 and the microwave antenna 13 have a predetermined distance in the length direction, that is, a certain distance is provided, so that the cooling water inlet channel 34 and the cooling water outlet channel 35 are conveniently provided.
The outer sleeve 10 is internally provided with a metal shielding cover 14 for enabling the microwave antenna 13 to emit directionally, in this embodiment, as shown in fig. 2, the metal shielding cover 14 adopts a metal tube with one end open and surrounding the microwave antenna 13, that is, the metal tube is arranged towards the end opening of the flexible coaxial cable 20, the flexible capillary tube 21 and the metal tube are fixed together through bonding, and a radiation window 17 is formed on the peripheral wall of the metal tube.
Preferably, as shown in fig. 2, the end of the flexible capillary tube 21 near the microwave antenna 13 is provided with a first bending part extending inwards or outwards, the metal tube is provided with a second bending part matched with the first bending part, and the bonding part of the flexible capillary tube 21 and the metal tube is positioned on the abutting surfaces of the first bending part and the second bending part. The design of the first bending part and the second bending part can effectively improve the bonding stability of the metal shielding cover 14 and the flexible capillary tube 21.
As shown in fig. 1, the end of the outer sleeve 10 far away from the working end is generally provided with a handle 30, a microwave input port is arranged at the handle 30 and is connected with a microwave ablation instrument through a cable for delivering microwave energy to the microwave antenna 13, and a water inlet pipe 31 and a water outlet pipe 32 which are respectively communicated with a cooling water inlet channel 34 and a cooling water outlet channel 35 are also arranged at the handle 30. This is the prior art, and reference is made to the relevant literature and will not be repeated.
With the improvement, as shown in fig. 3, the energy emitted by the microwave antenna 13 can only be emitted out of the radiation window 17 in a fan shape to form a generally fan-shaped radiation area 18 for shielding part of the energy radiated by the microwave antenna 13, so that the microwave energy can radiate directionally to one side, and the damage to the normal tissue of the trachea at the other side of the focus when the inner wall of the trachea of the lung or the focus adjacent to the inner wall of the trachea is ablated is avoided.
In this embodiment, the working end uses the ceramic sleeve 11 to replace the flexible outer tube, and since the length of the ceramic sleeve 11 (working end) is very short, the bending property of the tube body of the outer sleeve 10 is not affected, so that the treatment of the tumor focus in and adjacent to the trachea of the lung of a human body is facilitated, and meanwhile, the working end (microwave radiation core area) of the ceramic sleeve 11 can also resist high temperature, so that the problem of high-temperature softening of the tube body of the outer sleeve 10 in the prior art can be avoided, thereby avoiding the leakage of cooling water on the inner side of the tube body caused by melting the tube body, and reducing the injury to a patient.
In addition, since the flexible outer tube 12 is remote from the working end in this embodiment, a common flexible medical material such as PU (polyurethane), PVC (polyvinyl chloride), pebax (polyether block polyamide), or the like may be used.
The present embodiment can also be modified as follows:
1) As shown in fig. 2, an arc-shaped groove 16 is provided on the outer wall of the ceramic sleeve 11 at a position corresponding to the radiation window 17, so as to mark the microwave radiation direction of the working end.
2) As shown in fig. 2, a temperature sensor 15 is disposed on the outer wall of the ceramic sleeve 11 at a position corresponding to the radiation window 17, so as to monitor the temperature of the working end and prevent overheating.
3) As shown in fig. 2, a microwave isolation layer 19 is disposed on the outer surface of the end of the flexible outer tube 12, which is close to the ceramic sleeve 11, and the microwave isolation layer 19 is a metal layer and can be attached to the outer surface of the flexible outer tube by sputtering, spraying, electroplating or other methods, so as to shield microwave energy escaping along the direction of the flexible outer tube, avoid tailing generated by ablation and damage normal tissues of the human body.
Example two
The present embodiment differs from the first embodiment in that the metal shield 14 is provided in a different manner. In this embodiment, as shown in fig. 4, the microwave antenna 13 is located in the flexible capillary 21, a metal shielding layer surrounding the microwave antenna 13 is disposed on the inner wall of the flexible capillary 21 as a metal shielding cover 14, and a radiation window 17 is opened on the peripheral wall of the flexible capillary 21. That is, in this embodiment, the wall of the flexible capillary tube 21 is directly extended and the extended end is closed, and a metal shielding layer is provided on the inner wall of the extended flexible capillary tube 21 by sputtering, spraying, electroplating, or the like, so as to replace the metal tube in the first embodiment for microwave energy shielding.
Example III
The difference between this embodiment and the second embodiment is that the metal shielding cover 14 adopts another arrangement, as shown in fig. 5, a metal shielding layer is disposed on the inner wall of the ceramic sleeve 11 as the metal shielding cover 14, and a radiation window 17 is disposed on the metal shielding layer, that is, a metal shielding layer is directly disposed on the inner wall of the ceramic sleeve 11 by sputtering, spraying, electroplating, etc. to replace the metal tube in the first embodiment for microwave energy shielding.
Claims (8)
1. The flexible microwave ablation catheter comprises an outer sleeve, a coaxial cable and a microwave antenna, wherein a capillary tube is coaxially sleeved on the outer side of the coaxial cable; the method is characterized in that: the outer sleeve comprises a ceramic sleeve serving as a working end and a flexible outer tube fixedly connected with the ceramic sleeve; the coaxial cable is a flexible coaxial cable and is arranged in the flexible outer tube, and the capillary tube is a flexible capillary tube;
The microwave antenna is arranged in the ceramic sleeve and is connected with the inner conductor of the flexible coaxial cable;
And a metal shielding cover for enabling the microwave antenna to emit directionally is arranged in the outer sleeve.
2. The flexible microwave ablation catheter according to claim 1, wherein: the flexible capillary tube and the microwave antenna have preset intervals in the length direction, a metal tube surrounding the microwave antenna is adhered to the flexible capillary tube to serve as a metal shielding cover, the metal tube is arranged towards an end opening of the flexible coaxial cable, and a radiation window is formed in the peripheral wall of the metal tube.
3. The flexible microwave ablation catheter according to claim 2, wherein: the end part of the flexible capillary tube, which is close to the microwave antenna, is provided with a first bending part extending inwards or outwards, the metal cylinder is provided with a second bending part matched with the first bending part, and the bonding part of the flexible capillary tube and the metal cylinder is positioned on the adjacent surfaces of the first bending part and the second bending part.
4. The flexible microwave ablation catheter according to claim 1, wherein: the microwave antenna is positioned in the flexible capillary tube, a metal shielding layer surrounding the microwave antenna is arranged on the inner wall of the flexible capillary tube and used as a metal shielding cover, and a radiation window is formed in the peripheral wall of the flexible capillary tube.
5. The flexible microwave ablation catheter according to claim 1, wherein: the inner wall of the ceramic sleeve is provided with a metal shielding layer serving as a metal shielding cover, and the metal shielding layer is provided with a radiation window.
6. The flexible microwave ablation catheter according to any of claims 2-5, wherein: the outer wall of the ceramic sleeve is provided with an arc-shaped groove at the position corresponding to the radiation window.
7. The flexible microwave ablation catheter according to any of claims 1-5, wherein: the outer wall of the ceramic sleeve is provided with a temperature sensor at a position corresponding to the radiation window.
8. The flexible microwave ablation catheter according to any of claims 1-5, wherein: and a microwave isolation layer is arranged on the outer surface of one end of the flexible outer tube, which is close to the ceramic sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322586679.4U CN221243017U (en) | 2023-09-22 | 2023-09-22 | Flexible microwave ablation catheter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322586679.4U CN221243017U (en) | 2023-09-22 | 2023-09-22 | Flexible microwave ablation catheter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221243017U true CN221243017U (en) | 2024-07-02 |
Family
ID=91654039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322586679.4U Active CN221243017U (en) | 2023-09-22 | 2023-09-22 | Flexible microwave ablation catheter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221243017U (en) |
-
2023
- 2023-09-22 CN CN202322586679.4U patent/CN221243017U/en active Active
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| Date | Code | Title | Description |
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