CN113995507A - Outer structural tube for flexible ablation antenna and flexible ablation antenna thereof - Google Patents
Outer structural tube for flexible ablation antenna and flexible ablation antenna thereof Download PDFInfo
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- CN113995507A CN113995507A CN202111351026.7A CN202111351026A CN113995507A CN 113995507 A CN113995507 A CN 113995507A CN 202111351026 A CN202111351026 A CN 202111351026A CN 113995507 A CN113995507 A CN 113995507A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00005—Cooling or heating of the probe or tissue immediately surrounding the probe
- A61B2018/00011—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids
- A61B2018/00029—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids open
- A61B2018/00035—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids open with return means
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
- A61B2018/00345—Vascular system
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
- A61B2018/00529—Liver
- A61B2018/00535—Biliary tract
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00696—Controlled or regulated parameters
- A61B2018/00714—Temperature
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
- A61B2018/183—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves characterised by the type of antenna
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Abstract
The invention discloses an outer structural tube of an ablation antenna and a flexible ablation antenna thereof. The outer structure pipe comprises an outer pipe and an inner pipe, the inner pipe is provided with a bending groove, and the inner pipe and the outer pipe are made of high polymer materials. The flexible ablation antenna comprises an antenna head, an antenna main body and a circulating water supply mechanism. The antenna head, the antenna main body and the circulating water supply mechanism are connected in sequence. The antenna head comprises a microwave radiation head and a stress dispersion sleeve, wherein the microwave radiation head is a blunt head, and a blind hole in the microwave radiation head is electrically connected with an inner conductor of the radio frequency coaxial cable. The radio frequency coaxial cable, the water supply pipe and the outer structural pipe in the antenna main body are sleeved. A water inlet channel is formed between the radio frequency coaxial cable and the water supply pipe, and a water outlet channel is formed between the water supply pipe and the outer structural pipe. The handle is internally provided with a circulating water supply mechanism, an external water supply pipe and an external water outlet pipe are communicated with the circulating water supply mechanism, and a radio frequency cable connector in the handle is communicated with a radio frequency coaxial cable in the antenna main body. The invention has good bending property and is suitable for the scene application of the narrow cavity channel with small curvature.
Description
Technical Field
The invention relates to a flexible minimally invasive ablation device, namely an outer structural tube for a flexible ablation antenna and the flexible ablation antenna.
Background
Thermal ablation techniques represented by radio frequency ablation and microwave ablation are gradually mature in the treatment field of liver cancer, thyroid nodules, mammary glands and lung space occupying lesions. The radiofrequency ablation is successfully applied to the treatment fields of varicosity, esophageal stenosis, central lung lesion and the like, benefits patients, and the microwave ablation is rarely reported in the fields.
Compared with the radio frequency ablation, the microwave ablation has the advantages of fast temperature rise, short operation time, large ablation range, no need of skin electrodes and the like. However, the microwave ablation antenna in the prior art is mainly of a rigid straight needle bar structure, and the intervention mode is that the microwave ablation antenna enters a focus through skin-breaking puncture under the guidance of medical images. Obviously, the microwave ablation needle with a rigid straight needle rod structure cannot be used for the ablation treatment of the natural cavities and ducts on the deep surface of the central focus of the lung, the esophagus infarction, the biliary tract infarction, the varicosity and the like. If a microwave ablation needle with a flexible needle rod design can be used, the microwave ablation needle can directly reach focuses through natural cavities such as lung trachea, esophagus, biliary tract and venous cavity, and then treatment is implemented through microwave ablation, so that effects of micro-invasion, quick recovery and few postoperative complications which are not achieved by traditional operations can be achieved, meanwhile, another treatment scheme except radio frequency ablation can be provided for doctors, one-needle full-coverage ablation can be achieved for some large focuses, operation is simplified, operation time is shortened, and safety and reliability are achieved.
The invention patent application CN113413210A of the applicant discloses an ablation antenna with an injection and suction function, and discloses a circulating water cooling structure. The handle is a holding structural part of the whole ablation antenna, and a water supply tank body, a water return tank body and a radio frequency connector are integrated in the handle. The gap between the inner water supply pipe and the coaxial cable forms a water supply cavity channel, and the inner cavity of the water supply tank body is communicated with the water supply cavity channel. The gap between the middle structure pipe and the inner water supply pipe forms a water return cavity channel, and the inner cavity of the water return tank body is communicated with the water return cavity channel. The radio frequency connector is arranged on the end face of the water supply tank body and is electrically connected with the radio frequency coaxial cable. The water supply tank body and the water return tank body are respectively communicated with a water supply pipe for supplying water to the interior of the needle body and a water return pipe for flowing out of the needle body.
In the prior art, patent CN106037930B is a microwave ablation soft needle rod, and the design of the patent has some defects, such as:
1. the needle head is designed into an integral structure with a thick front part and a thin back part, the thick end is of an inclined plane structure convenient for puncture, and the thin end is in compression joint with the coaxial cable inner conductor, so that the needle head is easy to puncture the listed natural body cavities and ducts of the human body to cause serious medical accidents; meanwhile, because the length of the bevel structure at the thick end is generally not less than 5mm, and the length of the bevel structure at the thin end is not less than 5mm, the bevel structure can be reliably pressed with the inner conductor of the coaxial cable, so that the total length of the needle head is not less than 10mm, and the design ensures that the needle head can not pass through some natural cavities with small curvature in a human body, such as natural cavities of lung bronchus.
2. The outer tube formula macromolecular material as an organic whole of soft needle bar if guarantee the transmission of microwave, guarantee water circulation system's normal water flow simultaneously, under limited rod footpath, the outer pipe wall can design very thin, generally is 0.1mm, like this when in-service use, the polymer outer tube of a body structure is buckled very easily, and can not recover, and the soft needle pole of buckling melts the needle and has lost continuation forward propelling movement ability again, and the syringe needle can't reach the focus position, causes rivers to block up, causes the operation failure.
3. The water supply pipe of the water circulation system is arranged between the outer pipe and the radio frequency coaxial cable, and the radio frequency coaxial cable and the water circulation water supply pipe penetrate through the inner part of the water circulation system under the limited rod diameter, so that the microwave ablation soft needle rod cannot be thinned, and the application field is limited.
In view of the actual clinical needs and the problems in the prior art, the invention provides the medical flexible ablation antenna which is high in safety, reliable in surgical application and wide in application field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a flexible outer structural tube and a flexible ablation antenna which has high safety, reliable operation application and wide application field.
The outer structure pipe provided by the invention comprises an outer pipe and an inner pipe, wherein the outer pipe and the inner pipe are of a composite pipe structure which is sleeved inside and outside, and the outer pipe is hermetically coated on the inner pipe. A certain number of bending grooves are uniformly distributed at one end of the inner pipe, and the inner pipe and the outer pipe are made of high polymer materials. The inner pipe can be made of polyether-ether-ketone material, the outer pipe can be made of polytetrafluoroethylene material, and the pipe wall formed by compounding the inner pipe and the outer pipe is not more than 0.15 mm. The bending groove at the far end of the inner tube is a rectangular bending groove, or a triangular bending groove, or a trapezoidal bending groove, or a semicircular bending groove, or a spiral bending groove.
The flexible ablation antenna provided by the invention comprises an antenna head, an antenna main body and an antenna tail end circulating water supply mechanism. The antenna head, the antenna main body and the antenna tail end circulating water supply mechanism are connected in sequence.
The antenna head is located at the far end of the ablation antenna and comprises a microwave radiation head and a stress dispersion sleeve. The microwave radiation head adopts a blunt head design to prevent the wall of the cavity from being damaged when the microwave radiation head is pushed along the natural cavity of a human body, the outer diameter is generally designed to be 0.8-2.8mm, the microwave radiation head adopts a medical metal material, and meanwhile, the outer surface of the microwave radiation head is provided with an anti-adhesion coating or a film. The appearance structure adopts big end to end, and the tail end external diameter slightly is lighter than the head external diameter, with tail end suit in the antenna main part after, the external diameter of radiation head is identical with the external diameter of antenna main part. In addition, the end face of the tail end of the antenna head is also provided with a blind hole, and the blind hole is electrically connected with an inner conductor of the radio frequency coaxial cable. The length of the microwave radiation head is generally 1-8mm, the flexibility of the ablation antenna of the shorter microwave radiation head is further enhanced, the microwave radiation head is very suitable for passing through a cavity with small curvature, the shorter microwave radiation head is reliably connected with the antenna main body and is not easy to fall off, and the shorter microwave radiation head has a better treatment effect on tumors or nodules with the diameter of less than 3 mm.
The stress dispersion sleeve is a circular ring joint, is made of polymer materials such as Polytetrafluoroethylene (PTFE) and the like, is sleeved on a radio frequency coaxial cable dielectric layer, one end of the stress dispersion sleeve is matched with the tail end face of the microwave radiation head, and the other end of the stress dispersion sleeve is sleeved on the radio frequency coaxial cable outer conductor.
The front end of the antenna main body is sleeved on the tail end of the microwave radiation head, and the matching surface of the antenna main body is sealed by high-temperature-resistant medical adhesive. In order to solve the problems of poor bending performance and easy breakage of the flexible antenna, the outer structural tube of the antenna main body adopts a composite tube structure sleeved inside and outside, the inner tube adopts a high polymer material with better rigidity, such as polyether-ether-ketone, the outer tube adopts a high polymer material with better toughness and good hydrophobic performance, such as polytetrafluoroethylene, and the thickness of the tube wall of the structural tube formed by combining the inner tube and the outer tube is not more than 0.15 mm. In order to ensure that the head end of the flexible antenna has excellent bending performance and can easily penetrate through a small-curvature cavity in a body, a certain number of bending grooves are uniformly distributed at the far end of the inner pipe of the composite pipe, the bending grooves can be rectangular, triangular, trapezoidal, semicircular or the like, or spiral, the bending performance of the inner pipe is greatly improved under the action of the grooves, and the outer pipe is hermetically coated on the inner pipe. The curved slot may be formed by engraving, and the length of the curved slot is generally 20% -50% of the total length of the antenna body.
The antenna main body is sequentially sleeved and arranged by a radio frequency coaxial cable, a water supply pipe and an outer structure pipe from inside to outside. The radio frequency coaxial cable is divided into an inner conductor, a dielectric layer and an outer conductor from inside to outside, and the flexible radio frequency coaxial cable is adopted to improve the bending performance of the flexible microwave ablation antenna. The water supply pipe is sleeved outside the radio frequency coaxial cable, the front end of the water supply pipe extends to the tail end of the microwave radiation head, and the water supply pipe can be made of polytetrafluoroethylene materials. The outer structure pipe is a composite pipe consisting of an inner pipe and an outer pipe, a certain number of bending grooves are carved on the front section of the inner pipe to increase the bending performance, and the rear section is not processed to ensure the pushing performance.
The circulating water supply mechanism at the tail end of the antenna is arranged in the handle shell, and the flexible antenna main body needs to be cooled by circulating water in order to control the temperature of the needle rod in the microwave ablation process. In the antenna main body, cooling water enters the antenna head through a cavity channel between the radio frequency coaxial cable and the water supply pipe, namely a water inlet cavity channel, and then returns through a cavity channel between the water supply pipe and the outer structural pipe, namely a water outlet cavity channel. The external water supply pipe is communicated with the water inlet cavity channel and the water outlet cavity channel and the external water outlet pipe in the circulating water supply mechanism.
The circulating water supply mechanism is divided into a front part, a middle part and a rear part. The front part is hermetically connected with an outer structural pipe of the antenna main body, and the middle part is hermetically connected with a water supply pipe inside the flexible antenna. Meanwhile, a water collecting cavity is formed between the front part and the middle part, and a water supply cavity is formed between the middle part and the rear part. The external water supply pipe is communicated with the water inlet cavity channel through the water supply cavity, and the water outlet cavity channel is communicated with the external water outlet pipe through the water collecting cavity. The rear part is hermetically connected with the radio frequency coaxial cable outer conductor in the flexible antenna, and meanwhile, a radio frequency cable connector is also assembled on the end face of the rear part.
The handle shell is assembled outside the circulating water supply mechanism, and is convenient to hold. The circulating water supply mechanism can be made of medical metal materials or medical plastics, and different materials can be selected according to different selection of assembly and sealing processes.
The invention has the beneficial effects that:
1. the microwave radiation head adopts a blunt structure, and most of the tail part of the microwave radiation head is sleeved in the antenna main body, so that the rigid section of the head part of the flexible ablation antenna is shorter, the over-bending property is enhanced, and meanwhile, the stress dispersion sleeve added at the tail end can solve the problem of damage of a coaxial cable during over-bending and improve the safety.
2. The outer structure pipe of antenna main part adopts double-deck composite tube structure, and the design of composite tube anterior segment bending groove to increase the trafficability characteristic of little camber chamber way, but guarantee the pushability of back end simultaneously.
3. The antenna main body adopts a sleeve structure design, the water supply mechanism adopts a front structure, a middle structure and a rear structure, and a water supply cavity and a water collection cavity are internally distinguished, so that the water quantity during ablation can be ensured, the problem of water supply abnormality caused by the breakage of a water supply pipe after the antenna main body is bent in the prior art is solved, and the operation safety is improved.
4. Because the antenna main body adopts a sleeving structure, the minimum outer diameter of the antenna can be reduced to 1.4mm, even 1.2mm, the microwave ablation technology is applied to clinical treatment of narrow cavities and ducts such as biliary tracts, varicose veins and the like, and more various surgical treatment schemes are provided for clinic.
Drawings
Fig. 1 is an isometric view of a flexible ablation antenna of the present invention;
FIG. 2 is a cross-sectional view of a tip of a flexible ablation antenna of the present invention;
FIG. 3 is a cross-sectional view of the trailing end of the flexible ablation antenna of the present invention;
FIG. 4 is a partial sectional view of a water supply chamber of the circulating water supply mechanism of the present invention;
FIG. 5 is a partial sectional view of a water collecting chamber of the circulating water supply mechanism of the present invention;
FIG. 6 is a schematic view of the outer structural tube of the present invention cut away from the inside of the outer tube;
FIG. 7 is a schematic view of the inner tube rectangular curved slot of the outer structural tube of the present invention;
FIG. 8 is a schematic view of the triangular curved groove of the inner tube of the outer structural tube of the present invention;
fig. 9 is a schematic view of the inner tube helical bend groove of the outer structural tube of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 6, the outer structural tube 2012 used in the antenna main body 2 is a composite tube structure with an inner tube and an outer tube, and the inner tube 202 is made of a high polymer material with good rigidity, such as: polyether ether ketone, the outer pipe 201 is made of high polymer materials with good toughness and good hydrophobic property, such as: the wall of the structural pipe formed by compounding Polytetrafluoroethylene (PTFE) and the Polytetrafluoroethylene (PTFE) together is not more than 0.15 mm.
In order to ensure that the flexible antenna has excellent bending performance and is easy to pass through a cavity with small curvature in a body, a certain number of bending grooves 202-1 are uniformly distributed at the far end of the inner tube 202 of the outer structural tube 2012. Because the front section of the flexible antenna has higher over-bending requirement than the rear section, only the front section is selected to be provided with the bending groove 202-1, the bending groove 202-1 should be arranged along the axial direction of the flexible antenna main body 2 in a circular staggered manner, and the total axial length of the bending groove 202-1 preferably accounts for 20% -60% of the total axial length of the antenna main body 2. If the axial total length of the bending groove 202-1 is too short, the bending performance is not up to standard, and if the axial total length of the bending groove 202-1 is too long, the pushing force of the rear section of the outer structural pipe 2012 is reduced. The individual width of the bending groove 202-1 can be determined according to the individual requirement of the flexible ablation antenna on bending property, and is generally not less than 0.1mm, and is not more than 1 mm. The curved groove 202-1 preferably has an annular arc length of 60-80% of the outer diameter of the outer structural tube 2012 and the adjacent groove-to-groove spacing 202-2 is preferably no less than 10% of the outer diameter of the outer structural tube 2012.
The outer tube 201 of the outer structural tube 2012 is tightly attached to the inner tube 202, preferably by a heat-shrinking process using a hydrophobic, heat-resistant, elastic polymer material, such as PTFE film, to the inner tube 202, and the outer tube 201 should cover the entire inner tube 202. The inner tube 202 may be made of a polymer material or a medical metal material.
The curved groove 202-1 may be a rectangular notch circular staggered arrangement as shown in fig. 7, a triangular notch circular staggered arrangement as shown in fig. 8, or a spiral notch as shown in fig. 9. The notches of various shapes can improve the bending performance of the flexible antenna body, but the bending degree and the pushing performance are slightly different, and the bending groove 202-1 can also be a trapezoidal or semicircular bending groove and the like.
As shown in figure 1, the flexible ablation antenna of the invention comprises an antenna head 1, an antenna body 2 and a circulating water supply mechanism 3 at the tail end of the antenna.
In fig. 2, the antenna head 1 is located at the distal end of the flexible ablation antenna, and includes a microwave radiation head 101, a stress dispersion sleeve 102, and a front section of the antenna body. The microwave radiation head 101 adopts a blunt design to prevent the wall of the cavity from being damaged when pushed along the natural cavity of the human body, the outer diameter is generally designed to be 0.8-2.8mm, the microwave radiation head adopts medical metal materials, such as medical 304 stainless steel, and meanwhile, the outer surface is provided with an anti-adhesion coating or film, such as a polytetrafluoroethylene coating, or a parylene coating is used. The outer diameter of the tail end of the microwave radiation head 101 is slightly smaller than that of the head end, the tail end is sleeved on the antenna main body 2, and the outer diameter of the front end of the microwave radiation head 101 is just matched with that of the antenna main body 2. In addition, the microwave radiation head 101 has a blind hole at the end face of the rear end, and the blind hole is electrically connected to the inner conductor 206 of the rf coaxial cable.
The stress dispersion sleeve 102 is a circular joint, is made of polymer materials such as polytetrafluoroethylene and the like, is sleeved on the radio frequency coaxial cable dielectric layer 205, one end of the stress dispersion sleeve is matched with the tail end face of the microwave radiation head 101, and the other end of the stress dispersion sleeve is sleeved on the radio frequency coaxial cable outer conductor 204.
The front end of the antenna body 2 is sleeved on the thin end of the microwave radiation head 101, and the matching surface 103 is sealed by high-temperature-resistant medical adhesive. The antenna main body 2 is sequentially provided with a radio frequency coaxial cable, a water supply pipe 203 and an outer structural pipe 2012 from inside to outside. The radio frequency coaxial cable is divided into three layers, namely an inner conductor 206, a dielectric layer 205 and an outer conductor 204 from inside to outside, and the bending performance of the flexible microwave ablation antenna can be improved by adopting the flexible radio frequency coaxial cable. The water supply pipe 203 is sleeved outside the rf coaxial cable, the front end of the water supply pipe is located at the tail end of the microwave radiation head 101, and the water supply pipe 203 may be made of teflon. The front section of the inner tube 202 of the outer structural tube 2012 has a number of bending grooves 202-1 to increase the overbending performance, and the rear section is not treated to ensure pushability.
The circulating water supply mechanism 3 at the tail end of the antenna is used for controlling the temperature of the antenna main body 2 in the microwave ablation process and cooling the antenna main body 2 by circulating water. According to the flexible ablation antenna provided by the invention, cooling water enters the antenna head 1 through the water inlet channel between the radio frequency coaxial cable and the water supply pipe 203 and then returns through the water outlet channel between the water supply pipe 203 and the outer structural pipe 2012, as shown in fig. 2. The external water supply pipe 305 and the water inlet channel are communicated with each other in the circulating water supply mechanism 3, as shown in fig. 4, and the external water outlet pipe 306 and the water outlet channel are communicated with each other in the circulating water supply mechanism 3, as shown in fig. 5.
As shown in fig. 2, the circulating water supply mechanism 3 is divided into three parts, namely a front part 301, a middle part 302 and a rear part 303, and a water collecting cavity and a water supply cavity are formed in the circulating water supply mechanism. The front part 301 is hermetically connected with an external structural pipe 2012 of the antenna main body 2, the middle part 302 is hermetically connected with a water supply pipe 203 inside the antenna main body 2, and simultaneously is communicated with an external water supply pipe 305 to form a water supply cavity, the water supply cavity is communicated with a water inlet cavity channel, an external water outlet pipe 306 is communicated with a water collection cavity, and the water collection cavity is connected with a water outlet cavity channel; the rear portion 303 is hermetically connected to the rf coaxial cable outer conductor 204 inside the antenna main body 2, and an rf cable connector 304 is mounted on the end surface of the rear portion 303.
The handle 307 is mounted on the outside of the circulating water supply mechanism 3 for easy holding. The circulating water supply mechanism can be made of medical metal materials or medical plastics, and different materials can be selected according to different selection of assembly and sealing processes.
Claims (10)
1. An outer structural tube (2012) for a flexible antenna, characterized by: the composite pipe comprises an outer pipe (201) and an inner pipe (202), wherein the outer pipe (201) and the inner pipe (202) are of a composite pipe structure sleeved inside and outside, and the outer pipe (201) is hermetically coated on the inner pipe (202);
one end of the inner pipe (202) is uniformly distributed with bending grooves (202-1), and the bending grooves (202-1) are annularly staggered and axially arranged along the outer structural pipe (2012) or spirally arranged; the inner tube (202) and the outer tube (201) are made of high polymer materials.
2. An outer structural tube (2012) for a flexible antenna according to claim 1, wherein:
the inner pipe (202) is made of polyether-ether-ketone material, the outer pipe (201) is made of polytetrafluoroethylene material, the pipe wall formed by combining the inner pipe and the outer pipe is not more than 0.15mm, and the pipe diameter of the composite pipe is 0.8-2.8 mm.
3. An outer structural tube (2012) for a flexible antenna according to claim 2, wherein:
the bending groove (202-1) at the far end of the inner tube (202) is a rectangular bending groove, or a triangular bending groove, or a trapezoidal bending groove, or a semicircular bending groove.
4. An outer structural tube (2012) for a flexible antenna according to claim 3, wherein:
the individual width of the bending groove (202-1) is 0.1-1mm, the annular arc length of the bending groove (202-1) accounts for 60-80% of the outer diameter of the outer structural pipe (2012), and the distance between the adjacent grooves and the groove is less than 10% of the outer diameter of the outer structural pipe (2012).
5. An outer structural tube (2012) for a flexible antenna according to claim 1, wherein: the inner tube (202) is made of medical stainless steel material.
6. A flexible ablation antenna comprising the outer structural tube (2012) of claim 1, and comprising three parts of an antenna head (1), an antenna main body (2) and a circulating water supply mechanism (3) at the tail end of the antenna;
the antenna head (1) is connected with one end of the antenna main body (2), and the other end of the antenna main body (2) is connected with a circulating water supply mechanism (3) at the tail end of the antenna;
the antenna main body (2) is sequentially sleeved with a radio frequency coaxial cable, a water supply pipe (203) and an outer structural pipe (2012) from inside to outside; the radio frequency coaxial cable is divided into three layers, namely an inner conductor (206), a dielectric layer (205) and an outer conductor (204), from inside to outside; a water inlet cavity channel is arranged between the radio frequency coaxial cable and the water supply pipe (203), and a water outlet cavity channel is arranged between the water supply pipe (203) and the outer structural pipe (2012); the cooling water returns through the antenna head (1) through the water inlet cavity channel and flows out of the water outlet cavity channel;
the shell of the handle (307) is assembled outside the circulating water supply mechanism (3) at the tail end of the antenna, and an external water supply pipe (305) is communicated with the water inlet cavity channel and an external water outlet pipe (306) is communicated with the water outlet cavity channel in the circulating water supply mechanism (3) at the tail end of the antenna; a radio frequency cable connector (304) in the handle (307) is communicated with a radio frequency coaxial cable in the antenna main body (2);
the method is characterized in that:
the antenna head (1) is positioned at the far end of the flexible ablation antenna and comprises a microwave radiation head (101) and a stress dispersion sleeve (102);
the microwave radiation head (101) is made of medical metal materials and is in a blunt shape, the outer shape structure of the microwave radiation head is large in head and small in tail, the outer diameter of the tail end of the microwave radiation head is slightly smaller than the outer diameter of the head of the microwave radiation head, the tail end of the microwave radiation head (101) is sleeved on the antenna main body (2), and the outer diameter of the head of the microwave radiation head (101) is matched with the outer diameter of an outer structure tube (2012) of the antenna main body (2); the end face of the tail end of the microwave radiation head (101) is provided with a blind hole, and the blind hole is electrically connected with an inner conductor (206) of the radio frequency coaxial cable; the front end of the antenna main body (2) is sleeved on the thin end of the tail part of the microwave radiation head (101), and the matching surface (103) of the antenna main body is sealed by high-temperature-resistant medical adhesive;
the stress dispersion sleeve (102) is a circular ring joint, is made of high polymer materials and is sleeved on the radio frequency coaxial cable dielectric layer (205); one end of the stress dispersion sleeve (102) is matched with the tail end face of the microwave radiation head (101), the other end of the stress dispersion sleeve is sleeved on the outer conductor (204) of the radio-frequency coaxial cable, and the stress dispersion sleeve plays a role in dispersing stress at the connection position of the inner conductor (206) of the radio-frequency coaxial cable and the microwave radiation head (101).
7. A flexible ablation antenna according to claim 6, wherein:
the microwave radiation head (101) has an outer diameter of 0.8-2.8mm and a length of 1-8mm, and is made of medical 304 stainless steel; the outer surface of the microwave radiation head (101) is provided with an anti-sticking coating or film.
8. A flexible ablation antenna according to claim 7, wherein: the stress dispersion sleeve (102) is made of Polytetrafluoroethylene (PTFE) high polymer material;
the outer surface of the microwave radiation head (101) is coated with polytetrafluoroethylene or parylene.
9. A flexible ablation antenna according to claim 8, wherein:
the length of the bending groove of the inner pipe (202) of the outer structural pipe (2012) is 20-50% of the total length of the antenna main body (2).
10. A flexible ablation antenna according to claim 9, wherein:
the radio frequency coaxial cable adopts a flexible coaxial cable, and the wire diameter is matched with the inner diameter of the water supply pipe (203).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111351026.7A CN113995507A (en) | 2021-11-15 | 2021-11-15 | Outer structural tube for flexible ablation antenna and flexible ablation antenna thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111351026.7A CN113995507A (en) | 2021-11-15 | 2021-11-15 | Outer structural tube for flexible ablation antenna and flexible ablation antenna thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114569242A (en) * | 2022-03-05 | 2022-06-03 | 南京德文医学科技有限公司 | Non-water-cooled microwave ablation catheter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114569242A (en) * | 2022-03-05 | 2022-06-03 | 南京德文医学科技有限公司 | Non-water-cooled microwave ablation catheter |
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