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US20060293651A1 - Radiation applicator - Google Patents

Radiation applicator Download PDF

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Publication number
US20060293651A1
US20060293651A1 US11513885 US51388506A US2006293651A1 US 20060293651 A1 US20060293651 A1 US 20060293651A1 US 11513885 US11513885 US 11513885 US 51388506 A US51388506 A US 51388506A US 2006293651 A1 US2006293651 A1 US 2006293651A1
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Prior art keywords
dielectric
radiation
monopole
body
material
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Abandoned
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US11513885
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Nigel Cronin
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UK INVESTMENT ASSOCIATES LLC
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Nigel Cronin
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14Probes or electrodes therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/18Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/18Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
    • A61B18/1815Surgical 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00Electrotherapy; Circuits therefor
    • A61N1/02Details
    • A61N1/04Electrodes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00Radiation therapy
    • A61N5/02Radiation therapy using microwaves
    • A61N5/04Radiators for near-field treatment
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14Probes or electrodes therefor
    • A61B18/1492Probes or electrodes therefor having a flexible, catheter-like structure, e.g. for heart ablation
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00577Ablation
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/18Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
    • A61B18/1815Surgical 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
    • A61B2018/1861Surgical 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 with an instrument instered into a body lumen or cavity, e.g. a catheter

Abstract

This invention provides an elongate microwave radiator for insertion into a living body to treat tissue at a predetermined operating frequency. The radiator defines a monopole antenna at its tip. The monopole antenna includes a dielectric material surrounding the monopole. The dielectric material is configured to act as a resonator at the predetermined operating frequency, and encompasses generally the whole of a near-field radiation emitted by the monopole. In an illustrative embodiment, the dielectric material extends from the antenna a distance determined in accordance with the wavelength of the radiation in the dielectric.

Description

    RELATED APPLICATIONS
  • [0001]
    This application is a divisional of U.S. patent application Ser. No. 09/914,375, filed on Jan. 15, 2002 entitled RADIATION APPLICATOR by Nigel Cronin.
  • BACKGROUND OF THE INVENTION
  • [0002]
    1. Field of the Invention
  • [0003]
    This invention relates to microwave radiators and, in particular, to microwave ablation devices.
  • [0004]
    2. Background Information
  • [0005]
    A known microwave radiator, used for microwave ablation of tissue, compromises a microwave generator operatively coupled to an elongated waveguide for conveying the microwaves to the ablation site. The waveguide is sufficiently thin to be inserted into the body and contains a core dielectric material which enables efficient transmission of microwaves through the waveguide. At the emission end of the waveguide, the dielectric core protrudes and provides a radiating tip for coupling microwaves into surrounding tissue. An object of the inventor is to provide an improved radiation applicator.
  • [0006]
    According to one aspect, the invention includes an elongate microwave radiator for insertion into a living body to treat biological tissue at a predetermined operating frequency, the radiator comprising a monopole at its tip and dielectric material surrounding the monopole; characterized in that said dielectric material is adapted so that it acts as a resonator at said predetermined operating frequency, and encompasses generally the whole of the near-field radiation emitted by the monopole.
  • [0007]
    The invention is based on an appreciation of the fact that a monopole antenna generates a near-field, and that the near-field contains large field amplitudes which exist quasi-statically in the local region of the monopole and do not radiate energy. In a normal communications antenna, this local region is air-filled and these near-field amplitudes have no effect except to contribute reactance to the antenna impedance. However, in a medical application, if the near-field region contains biological matter, which is highly lossy, the near-field amplitudes will generate heat. Because of the high amplitudes and small volume of the near-field region, much heat can be generated in the near-field region, which reduces the energy in the far-field. Field penetration is therefore reduced, and local charring in the near-field region becomes a limiting factor in the power that can be input to the antenna.
  • [0008]
    The dielectric body according to the invention serves to provide a low loss environment to encompass the near field region so that more power is transmitted to the biological matter in the far-field region.
  • [0009]
    The extent of the near-field is determined by the wavelength λ of the radiation in the dielectric and the length L of the monopole according to the relationship 2 L2/λ. The extent of the near-field therefore is proportional to λ, and it is possible to reduce the extent of the near-field region by increasing, the dielectric constant of the body to reduce the wavelength of the radiation within it. The overall external dimension of the device can therefore be reduced for insertion into a living body. A higher dielectric constant will also accommodate the use of lower frequency radiation, which would otherwise increase the wavelength and the extent of the near-field; the lower frequency radiation being beneficial in increasing radiation penetration into the far-field.
  • [0010]
    A monopole antenna, for good impedance matching, has L generally equal to λ/2. By substitution in the above relationship, the extent of the near-field is then equal to λ/2, and this determines the minimum extent of the dielectric material. Furthermore, a λ/2 dimension for the dielectric material is consistent with its operation as a resonator to ensure that the radiator is effective in transmitting radiation at the required power levels for the treatment of biological material.
  • [0011]
    In one embodiment of the invention, the dielectric body comprises a cylindrical shape with the monopole extending axially along its center. A radiator of this kind can be designed with a minimum radius for insertion into biological matter such as a liver, and will create an annular radiation field around it. A pointed tip may be provided at the free end of the dielectric body to assist penetration of biological matter.
  • [0012]
    As the dielectric constant is increased, it may exceed that of the biological matter, which can lead to total internal reflection of radiation within the dielectric and a consequent reduction in transmitted radiation. In order to overcome this problem, the dielectric body is formed so that the dielectric constant at its core is higher than that at tits outer periphery, the latter having a value intermediate that of the core and the biological matter. Thus, the dielectric constant at the core may be higher than that of the surrounding biological matter so as to help reduce the overall diameter of the radiator. The different dielectric constants may correspond to different layers of dielectric, each with a different dielectric constant, or may correspond to different levels in a dielectric in which the dielectric constant varies throughout the depth.
  • [0013]
    According to another aspect, the invention includes an elongate microwave radiator for insertion into a living body to treat biological tissue at predetermined operating frequency, the radiator comprising a monopole at its tip and dielectric material surrounding and extending beyond the monopole; characterized in that said dielectric material terminates in a rounded tip portion and is adapted so that it acts as a resonator at said predetermined operating frequency and enhances transmission of radiation in the forward direction of insertion.
  • [0014]
    Preferably, the tip portion is generally hemispherical and has a radius generally equal to half a wavelength of the radiation.
  • [0015]
    The radiator may further comprise a coaxial conductor (preferably packed with a dielectric) which supplies radiation to the monopole antenna from a radiation generator. Preferably, the monopole then comprises an exposed length of the central conductor of the coaxial conductor at its distal end. Preferably, the exposed length of the central conductor providing the monopole, is generally half the wavelength of the radiation in the dielectric. The coaxial conductor may be rigid or flexible cable.
  • [0016]
    Preferably, the dielectric material has a dielectric constant, or relative permittivity, such that the length of the monopole is reduced. Advantageously, there can be a transformer between the coaxial conductor and the dielectric monopole to reduce reflection of radiation back into the coaxial conductor from the boundary between it and the dielectric material. Such a transformer can advantageously contain a space into which the dielectric packing of the coaxial conductor can expand.
  • [0017]
    According to yet another aspect, the invention includes methods of coupling radiation into biological material using the devices according to the invention.
  • [0018]
    According to yet another aspect, the invention consists in methods of coupling radiation into biological material using the devices according to the invention.
  • [0019]
    Further advantages and features of the invention will become apparent to readers skilled in the art upon consideration of the following description of embodiments of the invention, the embodiments being described by way of example only, and with reference to the accompanying figures in which:
  • [0020]
    FIG. 1 is shows a first embodiment of the radiation applicator;
  • [0021]
    FIG. 2 is shows the tip section of the radiation applicator of FIG. 1 in more detail;
  • [0022]
    FIG. 3 shows a second embodiment of the tip section of the radiation applicator incorporating a transformer;
  • [0023]
    FIG. 4 shows a third embodiment of the radiation applicator;
  • [0024]
    FIG. 5 shows the tip of the radiation applicator of FIG. 4; and
  • [0025]
    FIG. 6 shows a side-elevation of a variation design of the radiation applicator of FIG. 4.
  • [0026]
    FIG. 1 shows the general arrangement of the radiation system 100. A radiation generator 110, for example, a microwave generator, produces radiation which is coupled into coaxial cable 120 which transmits the radiation to a distal tip region 130 at which there is an antenna for emitting the radiation into the material surrounding the tip 130. In use, the coaxial cable 120 is introduced into a living body and the tip 130 is positioned adjacent a region which it is desired to irradiate. For example, the device could be inserted into an artery to irradiate plaques on the walls thereof or the device could be introduced into a uterus to irradiate the endometrium. The supply of radiation is controlled by a control device 140, often a foot pedal, which is used to signal the microwave generator to begin, adjust or stop the supply of radiation to the tip 130.
  • [0027]
    FIG. 2 shows the tip region 130 of the radiation applicator of FIG. 1 in more detail. The tip region, generally indicated 200, shows the distal end of the coaxial cable which comprises an outer conductor 210 spaced from a core conductor 220. The space between the conductors 210 and 220 is filled with dielectric material 230. The antenna for emitting radiation conducted by the cable comprises a length 240 of the core conductor of the coaxial cable extending beyond the outer conductor 210 at the distal end of the coaxial cable to form a monopole. To enhance the radiating qualities of the monopole 240, it is preferred that its length is about one half of a wavelength of the radiation dielectric. The monopole 240 is enveloped by dielectric body 250 in which the wavelength of the employed radiation is reduced below its free-space value hence enabling the monopole to be shorter than might otherwise be possible. The dielectric body 250 comprises a cylindrical portion 260 which envelops the monopole 240. The diameter of the cylindrical portion 260 is generally equal to the wavelength of the radiation in the dielectric at the operating frequency so that it is tuned to act as a resonator to increase the power it radiates. Also, the dielectric body comprises a hemispherical section 270 which supports partial internal reflection of the radiation from the antenna in the forward direction as indicated by arrows 280 and 290. Preferably, the hemispherical section 270 is dimensioned so as to provide a resonator which further enhances radiation from the dielectric body in 250 in the forward direction. Resonance of radiation partially reflected within the dielectric body 250 can be encouraged by, for example, dimensioning the hemispherical section 270 to have a radius approximately equal to one half of a wavelength of the radiation employed. It will be appreciated that the dielectric body can have other dimensions and shapes provided that they encourage forward propagation of the radiation by means of internal reflection and/or resonance.
  • [0028]
    When this equipment is to be used for endometrial ablation it is desirable to use radiation having a frequency around 9.2 GHz. In free-space, the wavelength of such radiation is about 32 mm. Forming the dielectric body from, for example, a material having a dielectric constant εR=25 reduces the wavelength to about 6 mm. Correspondingly, the diameter and overall length of the dielectric body are then also about 6 mm.
  • [0029]
    FIG. 3 shows an alternative embodiment of the tip section of the radiation applicator device, generally indicated 300. Here, in order to reduce reflection of radiation from the coaxial cable at the boundary between it and the dielectric body, a transformer 310 is incorporated between the coaxial cable and the dielectric body. The transformer 310 comprises several sections (for example, three: 320, 330, 340) of cylindrical shape and of successively increasing radius towards the dielectric body. Advantageously, at least the section 320 of the transformer adjacent the coaxial cable does not contain a solid filler material. This provides the benefit that, when the device is heated, for example in manufacture or in use, the dielectric material filling the space between the core and the outer conductors of the coaxial cable can expand into the transformer thus relieving otherwise deleterious pressures.
  • [0030]
    The near-field radiation generated by the applicator of FIGS. 2 and 3 extends from the monopole 240 a distance determined by the formula 2 L2/λ, where L is the length of the monopole, and λ is the wavelength of the radiation in the dielectric body 250. However, the preferred value of L is λ/2, and therefore the near-field radiation does not extend into the region of radius λ/2 about the monopole. Therefore, the near-field radiation does not extend into the more lossy biological material that surrounds the applicators in use, and the resulting detrimental affects of local charring and reduction of radiation penetration are reduced or avoided. Instead, the microwave power is emitted into the far-field to increase penetration and power transfer.
  • [0031]
    FIG. 4 shows yet another embodiment of the invention in which a generator 310 supplies microwave energy via a rigid coaxial conductor 320 to a tip region at the distal end of the conductor. Dielectric packing 330 is provided between the inner and outer conductors of the coaxial conductor 320. As shown in more detail in FIG. 5, a length of the inner conductor 340 at the tip is exposed by removal of the outer conductor so as to form a monopole to emit radiation. The monopole 340 is embedded axially in a cylindrical body of dielectric 350 which has substantially the same outer diameter as the coaxial conductor 320. A pointed metal tip 370 is fixed to the end of the dielectric body 350 and serves to assist penetration not biological matter, such as a liver to perform ablation on a tumour. The monopole 340 preferably has a length of substantially equal to half a wavelength of the radiation in the dielectric, and the radius of the dielectric body 350 is also preferably substantially equal to half a wavelength of the radiation in the dielectric. The near-field radiation emitted by the monopole will then lie within a region 2 L2/λ, which is equal to a radius of half of the wavelength of the radiation in the dielectric so that the near-field lies substantially totally within the dielectric. The dielectric constant of the dielectric body is selected to be high so as reduce losses within the dielectric. The microwave energy is therefore emitted into the far-field region in an annular pattern around the tip so as to increase field penetration and power transfer. Typically, a radiation applicator used with a generator operating at 10 GHz and having a dielectric body with dielectric constant εR=25, will have a dielectric body radius of 3 mm. Because the radius of the dielectric body 350 is substantially equal to half a wavelength, it is tuned to set as a resonator, which increases the power it radiates.
  • [0032]
    In order to reduce the diameter of the tip of the applicator, the dielectric body is made of a material with as high a dielectric constant as possible, except that this is limited by the dielectric constant of surrounding biological matter in which the applicator is used. When the dielectric constant of the dielectric body exceeds that of the biological matter, total internal reflection can occur at the outer surface of the dielectric body, and field penetration becomes evanescent and localized. In order to overcome this limitation, the dielectric body 350 may be formed with an inner core 360 composed of a material with a high dielectric constant, and an outer layer 380 composed of a dielectric with a lower dielectric constant intermediate that of the core and the surrounding biological material so as to match the wave impedance of the radiation between the core and the biological material. In order to achieve this, the refractive index of the outer layer 380 and that of biological material, and the outer layer thickness should be equal to a quarter of the wavelength of the radiation in the outer layer. Thus, the core radius would also be equal to a quarter of the wavelength of the radiation in the core in order to produce an overall nominal radius of half a wavelength at the tip.
  • [0033]
    In alternative embodiments of the invention, multiple outer layers may be used to increase the band-width of the applicator (i.e. the range of frequencies over which the applicator can be used) by making the layers each with a suitable refractive index and thickness. However, this will lead to an increase in the overall diameter of the tip. In the limit, the dielectric body could be made with continuously varying refractive index which decreases towards its outer surface.
  • [0034]
    Al alternative technique to reduce the dielectric constant of the outer layer 380 comprises forming indentations such as grooves 390, shown in FIG. 6, in the outer surface so that the average dielectric constant of the dielectric and the material in the grooves is reduced. The grooves may run longitudinally or circumferentially around the body 350.
  • [0035]
    It will be appreciated that the embodiment of FIGS. 2 and 3 can also be modified to incorporate an outer layer or layers of different dielectric constant, such as shown in FIGS. 5 and 6, the outer layer following the curve of the hemispherical tip.
  • [0036]
    Dielectric materials with a high dielectric constant that are suitable include those such as TiO2 with permittivity of 100 and CaTiO2 with permittivity of 155. These dielectrics would be suitable for use in the core 360 so as to reduce its diameter. The outer layer(s) 370 could be made of a composite of TiO2 and AlO2 having a permittivity between that of the core and the biological material. Materials with even higher permittivities may be used such as ferroelectric materials, an example being Ba1-xSrx TiO3 (BST) which has a permittivity of around 600.
  • [0037]
    Therefore, by suitable choice of dielectric(s) it is possible to produce radiation applicators with a tip diameter as low as 3 to 6 mm to allow their use in laparoscopic medical procedures, or even below 3 mm to allow percutaneous medical procedures.
  • [0038]
    Radiation applicators according to the invention can also be used to measure the dielectric constant of biological material by measuring the microwave radiation reflected back from the tip through the coaxial conductor.

Claims (18)

  1. 1. An elongate microwave radiator for insertion into a living body to treat tissue at a predetermined operating frequency, the radiator comprising a monopole antenna at its tip, the monopole antenna comprising:
    a monopole; and
    a dielectric material surrounding the monopole, the dielectric material being configured to act as a resonator at the predetermined operating frequency, and encompassing generally the whole of a near-field radiation emitted by the monopole.
  2. 2. The radiator as claimed in claim 1 in which the dielectric material extends from the antenna a distance determined in accordance with the wavelength of the radiation in the dielectric.
  3. 3. The radiator as claimed in claim 1 in which the dielectric material extends from the antenna a distance determined in accordance with the major dimension (L) of the antenna in the dielectric.
  4. 4. The radiator as claimed in claim 1 in which the dielectric material extends from the antenna a distance at least substantially equal to 2 L2/λ, where L is the major dimension of the antenna and λ is the wavelength of the radiation in the dielectric.
  5. 5. The radiator as claimed in claim 1 in which the dielectric material comprises a substantially cylindrical portion with the antenna extending axially at its centre a distance L.
  6. 6. The radiator as claimed in claim 2 in which the dielectric material extends from the antenna a distance substantially equal to half the wavelength of the radiation in the dielectric.
  7. 7. The radiator as claimed in claim 1 in which the monopole comprises a coaxial conductor with a central conductor that projects beyond outer screening of the coaxial conductor at the distal end to form the antenna.
  8. 8. The radiator as claimed in claim 7 in which the antenna has a length substantially equal to half the wavelength of the radiation in the dielectric.
  9. 9. The radiator as claimed in claim 7 including a transformer operatively connected between the coaxial conductor and the dielectric material to reduce reflection of radiation back into the coaxial conductor at the boundary with the dielectric material.
  10. 10. The radiator as claimed in claim 9 in which the transformer includes a space within the coaxial conductor into which packing of the coaxial conductor can expand.
  11. 11. An elongate radiator for insertion into a living body to treat biological tissue at a predetermined operating frequency, the radiator comprising a monopole antenna at a tip thereof, the monopole antenna comprising:
    a monopole; and
    dielectric material surrounding and extending beyond the monopole, the dielectric material terminating in a rounded tip portion and being condo to act as a resonator at the predetermined operating frequency to thereby enhance transmission of radiation in a forward direction therefrom.
  12. 12. The radiator as claimed in claim 11 in which the tip portion is substantially hemispherical.
  13. 13. A method of coupling radiation into biological material, the radiation being generated by an applicator comprising a monopole antenna including a monopole surrounded by a dielectric body of the monopole antenna, the method comprising the steps of:
    configuring the dielectric body of the monopole antenna to act as a resonator; and
    selecting the dielectric constant of the dielectric body in accordance with the wavelength of the radiation in the dielectric so that generally the whole of the near-field of the radiation is encompassed by the dielectric body.
  14. 14. The method as claimed in claim 13 in which the dielectric body extends from the monopole antenna a distance at least substantially equal to 2 L2/λ, where L is the major dimension of the antenna and λ is the wavelength of the radiation in the dielectric.
  15. 15. The method as claimed in claim 13 in which the major dimension of the monopole antenna is its length, which is substantially equal to half a wavelength of the radiation in the dielectric.
  16. 16. The method as claimed in claim 13 in which the dielectric body is located in relation to the biological material so that the far-field radiation lies within the biological material.
  17. 17. The method as claimed in claim 13 in which the dielectric constant of the dielectric body is high, but is lower than that of the biological material.
  18. 18. The method as claimed in claim 13 in which the dielectric constant of the dielectric body varies, and is higher at its core than its outer periphery, and the dielectric constant at its outer periphery is lower than that of the surrounding biological matter.
US11513885 1999-02-25 2006-08-31 Radiation applicator Abandoned US20060293651A1 (en)

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GB9904373A GB9904373D0 (en) 1999-02-25 1999-02-25 Radiation applicator
GBGB00/00682 2000-02-25
US09914375 US7118590B1 (en) 1999-02-25 2000-02-25 Radiation applicator
PCT/GB2000/000682 WO2000049957A1 (en) 1999-02-25 2000-02-25 Radiation applicator
US11513885 US20060293651A1 (en) 1999-02-25 2006-08-31 Radiation applicator

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US11513885 US20060293651A1 (en) 1999-02-25 2006-08-31 Radiation applicator
US12212234 US7955368B2 (en) 1999-02-25 2008-09-17 Radiation applicator
US13117198 US20110301588A1 (en) 1999-02-25 2011-05-27 Radiation applicator

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US09914375 Division US7118590B1 (en) 1999-02-25 2000-02-25 Radiation applicator
PCT/GB2000/000682 Division WO2000049957A1 (en) 1999-02-25 2000-02-25 Radiation applicator

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US11513885 Abandoned US20060293651A1 (en) 1999-02-25 2006-08-31 Radiation applicator
US12212234 Expired - Fee Related US7955368B2 (en) 1999-02-25 2008-09-17 Radiation applicator
US13117198 Abandoned US20110301588A1 (en) 1999-02-25 2011-05-27 Radiation applicator

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US13117198 Abandoned US20110301588A1 (en) 1999-02-25 2011-05-27 Radiation applicator

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US (4) US7118590B1 (en)
EP (2) EP2080485B1 (en)
JP (1) JP3905313B2 (en)
CN (2) CN1210004C (en)
CA (2) CA2368689C (en)
DE (2) DE60041959D1 (en)
GB (3) GB9904373D0 (en)
RU (1) RU2266146C2 (en)
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100030207A1 (en) * 2006-10-10 2010-02-04 Medical Device Innovations Limited Surgical antenna
US20100045558A1 (en) * 2008-08-25 2010-02-25 Vivant Medical, Inc. Dual-Band Dipole Microwave Ablation Antenna
US20100094273A1 (en) * 2008-10-13 2010-04-15 Vivant Medical, Inc. Antenna Assemblies for Medical Applications
US20100268219A1 (en) * 2009-04-15 2010-10-21 Medwaves, Inc. Radio frequency based ablation system and method with dielectric transformer
EP2281522A1 (en) * 2009-08-05 2011-02-09 Vivant Medical, Inc. Electrosurgical devices having dielectric loaded coaxial aperture with distally positioned resonant structure and method of manufacturing the same
US20110098696A1 (en) * 2009-10-28 2011-04-28 Vivant Medical, Inc. System and Method for Monitoring Ablation Size
US8059059B2 (en) 2008-05-29 2011-11-15 Vivant Medical, Inc. Slidable choke microwave antenna
US8679108B2 (en) 2009-02-20 2014-03-25 Covidien Lp Leaky-wave antennas for medical applications
US8740893B2 (en) 2010-06-30 2014-06-03 Covidien Lp Adjustable tuning of a dielectrically loaded loop antenna
US9681916B2 (en) 2012-01-06 2017-06-20 Covidien Lp System and method for treating tissue using an expandable antenna
US9693823B2 (en) 2012-01-06 2017-07-04 Covidien Lp System and method for treating tissue using an expandable antenna

Families Citing this family (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6104959A (en) 1997-07-31 2000-08-15 Microwave Medical Corp. Method and apparatus for treating subcutaneous histological features
US6306132B1 (en) 1999-06-17 2001-10-23 Vivant Medical Modular biopsy and microwave ablation needle delivery apparatus adapted to in situ assembly and method of use
US7128739B2 (en) * 2001-11-02 2006-10-31 Vivant Medical, Inc. High-strength microwave antenna assemblies and methods of use
US6878147B2 (en) 2001-11-02 2005-04-12 Vivant Medical, Inc. High-strength microwave antenna assemblies
US6752767B2 (en) 2002-04-16 2004-06-22 Vivant Medical, Inc. Localization element with energized tip
US7197363B2 (en) 2002-04-16 2007-03-27 Vivant Medical, Inc. Microwave antenna having a curved configuration
GB2387544B (en) * 2002-10-10 2004-03-17 Microsulis Plc Microwave applicator
CN100377696C (en) * 2003-03-26 2008-04-02 悉尼科技大学 A microwave antenna for medical ablation
DE502004000169D1 (en) 2003-05-14 2006-01-12 Kilian Kraus Height adjustable implant for use between vertebral bodies and handling tool
GB2403148C2 (en) * 2003-06-23 2013-02-13 Microsulis Ltd Radiation applicator
US7311703B2 (en) 2003-07-18 2007-12-25 Vivant Medical, Inc. Devices and methods for cooling microwave antennas
GB2432791B (en) * 2003-10-03 2008-06-04 Microsulis Ltd Treatment of hollow anatomical structures
WO2005034783A1 (en) 2003-10-03 2005-04-21 Microsulis Limited Device and method for the treatment of hollow anatomical structures
GB2406521B (en) 2003-10-03 2007-05-09 Microsulis Ltd Treatment of hollow anatomical structures
DE10357926B3 (en) 2003-12-11 2005-09-01 Deltacor Gmbh Length-adjustable spinal implant
GB0415973D0 (en) * 2004-07-16 2004-08-18 Microsulis Ltd Radiation applicator
US7799019B2 (en) 2005-05-10 2010-09-21 Vivant Medical, Inc. Reinforced high strength microwave antenna
WO2007112102A1 (en) 2006-03-24 2007-10-04 Micrablate Center fed dipole for use with tissue ablation systems, devices, and methods
US8068921B2 (en) 2006-09-29 2011-11-29 Vivant Medical, Inc. Microwave antenna assembly and method of using the same
GB0620061D0 (en) * 2006-10-10 2006-11-22 Medical Device Innovations Ltd Oesophageal treatment apparatus and method
GB0620063D0 (en) * 2006-10-10 2006-11-22 Medical Device Innovations Ltd Needle structure and method of performing needle biopsies
GB0624658D0 (en) 2006-12-11 2007-01-17 Medical Device Innovations Ltd Electrosurgical ablation apparatus and a method of ablating biological tissue
KR101826243B1 (en) 2007-12-12 2018-02-06 미라마 랩스 인코포레이티드 Systems, apparatus, methods and procedures for the noninvasive treatment of tissue using microwave energy
EP2142129A4 (en) 2007-04-19 2011-04-20 Miramar Labs Inc Methods and apparatus for reducing sweat production
EP2271276A4 (en) 2008-04-17 2013-01-23 Miramar Labs Inc Systems, apparatus, methods and procedures for the noninvasive treatment of tissue using microwave energy
KR101654863B1 (en) 2007-12-12 2016-09-22 미라마 랩스 인코포레이티드 Systems, apparatus, methods and procedures for the noninvasive treatment of tissue using microwave energy
CN101711134B (en) 2007-04-19 2016-08-17 米勒玛尔实验室公司 System for applying microwave energy to the tissue and produce a tissue layer effect in a tissue system
US8353901B2 (en) 2007-05-22 2013-01-15 Vivant Medical, Inc. Energy delivery conduits for use with electrosurgical devices
US9023024B2 (en) 2007-06-20 2015-05-05 Covidien Lp Reflective power monitoring for microwave applications
US8280525B2 (en) 2007-11-16 2012-10-02 Vivant Medical, Inc. Dynamically matched microwave antenna for tissue ablation
US8292880B2 (en) 2007-11-27 2012-10-23 Vivant Medical, Inc. Targeted cooling of deployable microwave antenna
WO2009140511A1 (en) 2008-05-14 2009-11-19 J&J Solutions, Inc. Systems and methods for safe medicament transport
US8211098B2 (en) * 2008-08-25 2012-07-03 Vivant Medical, Inc. Microwave antenna assembly having a dielectric body portion with radial partitions of dielectric material
US8251987B2 (en) 2008-08-28 2012-08-28 Vivant Medical, Inc. Microwave antenna
US8540708B2 (en) 2008-10-21 2013-09-24 Hermes Innovations Llc Endometrial ablation method
US8500732B2 (en) 2008-10-21 2013-08-06 Hermes Innovations Llc Endometrial ablation devices and systems
US9662163B2 (en) 2008-10-21 2017-05-30 Hermes Innovations Llc Endometrial ablation devices and systems
US8197476B2 (en) 2008-10-21 2012-06-12 Hermes Innovations Llc Tissue ablation systems
US8197477B2 (en) 2008-10-21 2012-06-12 Hermes Innovations Llc Tissue ablation methods
US8372068B2 (en) 2008-10-21 2013-02-12 Hermes Innovations, LLC Tissue ablation systems
EP3228272A1 (en) 2009-07-28 2017-10-11 Neuwave Medical, Inc. Ablation system
US8069553B2 (en) * 2009-09-09 2011-12-06 Vivant Medical, Inc. Method for constructing a dipole antenna
US8715278B2 (en) 2009-11-11 2014-05-06 Minerva Surgical, Inc. System for endometrial ablation utilizing radio frequency
US8821486B2 (en) 2009-11-13 2014-09-02 Hermes Innovations, LLC Tissue ablation systems and methods
US8529562B2 (en) 2009-11-13 2013-09-10 Minerva Surgical, Inc Systems and methods for endometrial ablation
US9289257B2 (en) 2009-11-13 2016-03-22 Minerva Surgical, Inc. Methods and systems for endometrial ablation utilizing radio frequency
CA2800312A1 (en) 2010-05-03 2011-11-10 Neuwave Medical, Inc. Energy delivery systems and uses thereof
US9561076B2 (en) * 2010-05-11 2017-02-07 Covidien Lp Electrosurgical devices with balun structure for air exposure of antenna radiating section and method of directing energy to tissue using same
CA2800278C (en) 2010-05-27 2015-09-01 J&J Solutions, Inc. Closed fluid transfer system
US8956348B2 (en) 2010-07-21 2015-02-17 Minerva Surgical, Inc. Methods and systems for endometrial ablation
US9510897B2 (en) 2010-11-05 2016-12-06 Hermes Innovations Llc RF-electrode surface and method of fabrication
US9314301B2 (en) 2011-08-01 2016-04-19 Miramar Labs, Inc. Applicator and tissue interface module for dermatological device
WO2013096803A3 (en) * 2011-12-21 2014-09-25 Neuwave Medical, Inc. Energy delivery systems and uses thereof
CN103071243B (en) * 2013-01-22 2015-06-24 北京纬博天健科技有限公司 Matching device for external radiation microwave treatment
US9901394B2 (en) 2013-04-04 2018-02-27 Hermes Innovations Llc Medical ablation system and method of making
WO2015017858A1 (en) 2013-08-02 2015-02-05 J&J SOLUTIONS, INC. d.b.a CORVIDA MEDICAL Compounding systems and methods for safe medicament transport
US9649125B2 (en) 2013-10-15 2017-05-16 Hermes Innovations Llc Laparoscopic device
US20150250540A1 (en) * 2014-03-10 2015-09-10 Wisconsin Alumni Research Foundation Microwave ablation antenna system
US20170296268A1 (en) 2016-04-15 2017-10-19 Neuwave Medical, Inc. Systems and methods for energy delivery

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409993A (en) * 1980-07-23 1983-10-18 Olympus Optical Co., Ltd. Endoscope apparatus
US4643186A (en) * 1985-10-30 1987-02-17 Rca Corporation Percutaneous transluminal microwave catheter angioplasty
US4662383A (en) * 1982-09-27 1987-05-05 Kureha Kagaku Kogyo Kabushiki Kaisha Endotract antenna device for hyperthermia
US4865047A (en) * 1988-06-30 1989-09-12 City Of Hope Hyperthermia applicator
US4967765A (en) * 1988-07-28 1990-11-06 Bsd Medical Corporation Urethral inserted applicator for prostate hyperthermia
US5026959A (en) * 1988-11-16 1991-06-25 Tokyo Keiki Co. Ltd. Microwave radiator for warming therapy
US5129396A (en) * 1988-11-10 1992-07-14 Arye Rosen Microwave aided balloon angioplasty with lumen measurement
US5220927A (en) * 1988-07-28 1993-06-22 Bsd Medical Corporation Urethral inserted applicator for prostate hyperthermia
US5249585A (en) * 1988-07-28 1993-10-05 Bsd Medical Corporation Urethral inserted applicator for prostate hyperthermia
US5300099A (en) * 1992-03-06 1994-04-05 Urologix, Inc. Gamma matched, helical dipole microwave antenna
US5344435A (en) * 1988-07-28 1994-09-06 Bsd Medical Corporation Urethral inserted applicator prostate hyperthermia
US5344441A (en) * 1991-07-03 1994-09-06 Volker Gronauer Antenna arrangement with supply cable for medical applications
US5370677A (en) * 1992-03-06 1994-12-06 Urologix, Inc. Gamma matched, helical dipole microwave antenna with tubular-shaped capacitor
US5370676A (en) * 1992-04-08 1994-12-06 Institut National De La Sante Et De La Recherche Medicale Device for application of hyperthermia in a particular body using microwaves
US5628771A (en) * 1993-05-12 1997-05-13 Olympus Optical Co., Ltd. Electromagnetic-wave thermatological device
US5693082A (en) * 1993-05-14 1997-12-02 Fidus Medical Technology Corporation Tunable microwave ablation catheter system and method
US6047216A (en) * 1996-04-17 2000-04-04 The United States Of America Represented By The Administrator Of The National Aeronautics And Space Administration Endothelium preserving microwave treatment for atherosclerosis

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981003616A1 (en) 1980-06-17 1981-12-24 T Sandhu Microwave antenna system for intracavitary insertion
JPS6043982A (en) 1983-08-20 1985-03-08 Sanyo Electric Co Ltd Television receiver
US4700716A (en) 1986-02-27 1987-10-20 Kasevich Associates, Inc. Collinear antenna array applicator
EP0415997A4 (en) 1988-05-18 1992-04-08 Kasevich Associates, Inc. Microwave balloon angioplasty
JPH02289272A (en) 1989-04-28 1990-11-29 Olympus Optical Co Ltd Hot heat medical treating device
DE3926934C2 (en) 1989-08-16 1993-07-15 Deutsches Krebsforschungszentrum Stiftung Des Oeffentlichen Rechts, 6900 Heidelberg, De
JPH0724690B2 (en) 1990-05-25 1995-03-22 オリンパス光学工業株式会社 Thermal therapy for probe
FR2679456A1 (en) 1991-07-26 1993-01-29 Technomed Int Sa Apparatus for in situ thermotherapy treatment of the mucous membrane of the uterine cavity
WO1993020768A1 (en) 1992-04-13 1993-10-28 Ep Technologies, Inc. Steerable microwave antenna systems for cardiac ablation
FR2699069B1 (en) 1992-12-15 1995-01-20 Sadis Bruker Spectrospin Applicator, in particular for microwave thermotherapy of the endometrium, and processing device having such an applicator.
WO1995005869A1 (en) 1993-08-24 1995-03-02 Kaare Grue A probe for a microwave apparatus for clinical and surgical treatment
US5471222A (en) * 1993-09-28 1995-11-28 The Antenna Company Ultrahigh frequency mobile antenna system using dielectric resonators for coupling RF signals from feed line to antenna
JPH08187297A (en) 1995-01-11 1996-07-23 Olympus Optical Co Ltd Microwave treatment device
US5810803A (en) * 1996-10-16 1998-09-22 Fidus Medical Technology Corporation Conformal positioning assembly for microwave ablation catheter
GB9809536D0 (en) * 1998-05-06 1998-07-01 Microsulis Plc Sensor positioning
JPH11320070A (en) 1998-05-19 1999-11-24 Toshiba Mach Co Ltd Hot-water supply apparatus for die casting machine
US6097985A (en) * 1999-02-09 2000-08-01 Kai Technologies, Inc. Microwave systems for medical hyperthermia, thermotherapy and diagnosis
US6325796B1 (en) * 1999-05-04 2001-12-04 Afx, Inc. Microwave ablation instrument with insertion probe
US6287302B1 (en) * 1999-06-14 2001-09-11 Fidus Medical Technology Corporation End-firing microwave ablation instrument with horn reflection device

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409993A (en) * 1980-07-23 1983-10-18 Olympus Optical Co., Ltd. Endoscope apparatus
US4662383A (en) * 1982-09-27 1987-05-05 Kureha Kagaku Kogyo Kabushiki Kaisha Endotract antenna device for hyperthermia
US4643186A (en) * 1985-10-30 1987-02-17 Rca Corporation Percutaneous transluminal microwave catheter angioplasty
US4865047A (en) * 1988-06-30 1989-09-12 City Of Hope Hyperthermia applicator
US4967765A (en) * 1988-07-28 1990-11-06 Bsd Medical Corporation Urethral inserted applicator for prostate hyperthermia
US5344435A (en) * 1988-07-28 1994-09-06 Bsd Medical Corporation Urethral inserted applicator prostate hyperthermia
US5220927A (en) * 1988-07-28 1993-06-22 Bsd Medical Corporation Urethral inserted applicator for prostate hyperthermia
US5249585A (en) * 1988-07-28 1993-10-05 Bsd Medical Corporation Urethral inserted applicator for prostate hyperthermia
US5129396A (en) * 1988-11-10 1992-07-14 Arye Rosen Microwave aided balloon angioplasty with lumen measurement
US5026959A (en) * 1988-11-16 1991-06-25 Tokyo Keiki Co. Ltd. Microwave radiator for warming therapy
US5344441A (en) * 1991-07-03 1994-09-06 Volker Gronauer Antenna arrangement with supply cable for medical applications
US5300099A (en) * 1992-03-06 1994-04-05 Urologix, Inc. Gamma matched, helical dipole microwave antenna
US5370677A (en) * 1992-03-06 1994-12-06 Urologix, Inc. Gamma matched, helical dipole microwave antenna with tubular-shaped capacitor
US5370676A (en) * 1992-04-08 1994-12-06 Institut National De La Sante Et De La Recherche Medicale Device for application of hyperthermia in a particular body using microwaves
US5628771A (en) * 1993-05-12 1997-05-13 Olympus Optical Co., Ltd. Electromagnetic-wave thermatological device
US5693082A (en) * 1993-05-14 1997-12-02 Fidus Medical Technology Corporation Tunable microwave ablation catheter system and method
US6047216A (en) * 1996-04-17 2000-04-04 The United States Of America Represented By The Administrator Of The National Aeronautics And Space Administration Endothelium preserving microwave treatment for atherosclerosis

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9050115B2 (en) * 2006-10-10 2015-06-09 Creo Medical Limited Surgical antenna
US20100030207A1 (en) * 2006-10-10 2010-02-04 Medical Device Innovations Limited Surgical antenna
US8361062B2 (en) 2008-05-29 2013-01-29 Vivant Medical, Inc. Slidable choke microwave antenna
US8059059B2 (en) 2008-05-29 2011-11-15 Vivant Medical, Inc. Slidable choke microwave antenna
US9173706B2 (en) * 2008-08-25 2015-11-03 Covidien Lp Dual-band dipole microwave ablation antenna
US9439730B2 (en) 2008-08-25 2016-09-13 Covidien Lp Dual-band dipole microwave ablation antenna
US20100045558A1 (en) * 2008-08-25 2010-02-25 Vivant Medical, Inc. Dual-Band Dipole Microwave Ablation Antenna
US20100094273A1 (en) * 2008-10-13 2010-04-15 Vivant Medical, Inc. Antenna Assemblies for Medical Applications
US9375272B2 (en) * 2008-10-13 2016-06-28 Covidien Lp Antenna assemblies for medical applications
US8968292B2 (en) 2009-02-20 2015-03-03 Covidien Lp Leaky-wave antennas for medical applications
US8679108B2 (en) 2009-02-20 2014-03-25 Covidien Lp Leaky-wave antennas for medical applications
US8934989B2 (en) * 2009-04-15 2015-01-13 Medwaves, Inc. Radio frequency based ablation system and method with dielectric transformer
US20100268219A1 (en) * 2009-04-15 2010-10-21 Medwaves, Inc. Radio frequency based ablation system and method with dielectric transformer
EP2281522A1 (en) * 2009-08-05 2011-02-09 Vivant Medical, Inc. Electrosurgical devices having dielectric loaded coaxial aperture with distally positioned resonant structure and method of manufacturing the same
US20110034917A1 (en) * 2009-08-05 2011-02-10 Vivant Medical, Inc. Electrosurgical Devices having Dielectric Loaded Coaxial Aperture with Distally Positioned Resonant Structure and Method of Manufacturing Same
US8328799B2 (en) 2009-08-05 2012-12-11 Vivant Medical, Inc. Electrosurgical devices having dielectric loaded coaxial aperture with distally positioned resonant structure
EP2962655A1 (en) * 2009-08-05 2016-01-06 Covidien LP Antenna assembly and electrosurgical device
US8852180B2 (en) 2009-10-28 2014-10-07 Covidien Lp System and method for monitoring ablation size
US20110098696A1 (en) * 2009-10-28 2011-04-28 Vivant Medical, Inc. System and Method for Monitoring Ablation Size
US8430871B2 (en) 2009-10-28 2013-04-30 Covidien Lp System and method for monitoring ablation size
US8740893B2 (en) 2010-06-30 2014-06-03 Covidien Lp Adjustable tuning of a dielectrically loaded loop antenna
US9549778B2 (en) 2010-06-30 2017-01-24 Covidien Lp Adjustable tuning of a dielectrically loaded loop antenna
US9681916B2 (en) 2012-01-06 2017-06-20 Covidien Lp System and method for treating tissue using an expandable antenna
US9693823B2 (en) 2012-01-06 2017-07-04 Covidien Lp System and method for treating tissue using an expandable antenna

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