WO1995005869A1 - Sonde pour appareil a micro-ondes destine aux traitements cliniques et chirurgicaux - Google Patents
Sonde pour appareil a micro-ondes destine aux traitements cliniques et chirurgicaux Download PDFInfo
- Publication number
- WO1995005869A1 WO1995005869A1 PCT/NO1994/000137 NO9400137W WO9505869A1 WO 1995005869 A1 WO1995005869 A1 WO 1995005869A1 NO 9400137 W NO9400137 W NO 9400137W WO 9505869 A1 WO9505869 A1 WO 9505869A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- microwave
- probe
- radiator
- coaxial cable
- ground plane
- Prior art date
Links
Classifications
-
- 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
-
- 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
Definitions
- the invention concerns a probe for a microwave apparatus for clinical and surgical treatment of tissue in vivo, especially intra-uterine treatment of the endometrium by means of hyperthermia, wherein the probe is supplied with microwave energy from a microwave generator provided in the microwave apparatus via a coaxial cable which is terminated in such a manner that it acts as a microwave radiator.
- US-PS no. 4 057 063 there is disclosed a device for sterilizing women by transuterine coagulation of the tubes which lead to the uterus, wherein there is used a high frequency generator and a probe connected thereto which constitutes an active electrode. The sterilization takes place by sealing the lumen of the tubes which lead to the uterus by electrical coagulation of the tissue.
- US-PS no. 4 292 960 discloses an apparatus for employing radioactive and microwave energy on the walls of an internal organ in the body such as the uterus.
- EP patent application no. 0 459 535 discloses an apparatus for surgical treatment of tissue by means of hyperthermia.
- the apparatus comprises a device for generating microwave energy, which device is located in a probe which can be inserted into one of the body's cavities, e.g. through the urethra in order to treat the prostate gland, but this requires a high degree of accuracy with regard to positioning.
- microwave probes which are used for hyperthermal treatment of tissue in vivo are used for hyperthermal treatment of tissue in vivo.
- the temperature in adjacent tissue and organs has to be kept under close supervision in order to prevent them from being damaged.
- the radiation characteristic of the above-mentioned and other known microwave probes is of such a nature that a part of the energy is absorbed by tissue and organs which are not meant to be treated, with the risk of causing them permanent damage, while at the same time the energy supplied to the organ and tissue for which the treatment is intended is less than the optimum.
- monitoring is undertaken of the temperature of tissue and organs adjacent to tissue and organs which are to be treated.
- the impedance in adjacent tissue and organs can be monitored, the treatment being discontinued when the impedance exceeds a fixed value.
- devices are employed in the prior art in order to increase the energy supplied to the area which has to be treated, e.g.
- microwave-reflecting devices which, e.g., can be inserted into adjacent cavities, thereby avoiding the disadvantages associated with an asymmetrical radiation characteristic.
- the known devices for microwave treatment with hyperthermia make demands on the operator's experience and accuracy if the risk of damage is to be substantially eliminated and the said devices are also often complicated, which makes them difficult to use under primitive conditions.
- a microwave probe which is simple to operate and use, without entailing the risk of inadvertent tissue damage to the patients.
- a microwave probe which can be used with an apparatus for treatment of the endometrium in women with a view to coagulation or destruction of the endometrium, the apparatus being used in this context inter-uterinely in order to treat, e.g. haemorrhages in the uterus or to effect the sterilization of the women.
- the apparatus should be so simple and safe to use that it is suitable, for example, for sterilizing women under primitive conditions, e.g. in developing countries.
- a microwave probe with an isotropic and symmetrical radiation characteristic without sidelobe effects.
- a probe according to the invention which is characterized by the probe comprising a combination of the microwave radiator in the form of an exposed section of the end of the coaxial cable's inner conductor and a ground plane provided behind the exposed section of the inner conductor, the ground plane constituting the transition between the microwave radiator and the coaxial cable which supplies microwave energy to the probe, the length of the ground plane being greater than the length of the microwave radiator.
- Fig. 1 is a schematic illustration of the probe according to the invention.
- Fig. 2 illustrates the probe employed in a microwave apparatus suitable for intra- uterine use.
- the probe according to the invention is illustrated schematically in fig. 1.
- the probe 1 consists of an exposed section A of the inner conductor of the coaxial cable 4, together with a ground plane GP provided around an adjacent section of the inner conductor of the coaxial cable 4, the ground plane thus forming the transition between the radiator A and the coaxial cable's outer conductor.
- the radiator or antenna A is a quarter-wave radiator, i.e. its length is a quarter ⁇ , possibly with the addition of a correction factor.
- the preferred length of the ground plane GP is 1.05 times the length of the radiator A and will depend on the frequency of the microwave energy employed and the desired radiation characteristic of the radiator A.
- the radiation characteristic RC is indicated by the dotted line, as it appears in the axial plane of the radiator A. It can be seen that the radiation characteristic RC is approximately symmetrical about the axis of the radiator A as well as also being approximately isotropic. The radiation characteristic will appear in a corresponding manner in the radial plane, i.e. as symmetrical and isotropic.
- the energy radiated from the probe 1 is approximately equal in all directions and it is not critical how the probe is applied in the uterus, since it does not exhibit any directional effects.
- the ground plane GP helps to give the desired radiation pattern, it also simultaneously prevents the radiation characteristic from showing backwardly-directed sidelobes.
- its location in the uterus is not critical and it can be operated without risk by even an inexperienced operator and under primitive conditions.
- the radiator A When in use the radiator A will normally be protected by a shrink stocking S, thus avoiding damage to the patient.
- the probe 1 according to the present invention is specially suited to treatment of the endometrium in women, the absorption of microwaves in the endometrium causing cauterization or coagulation of the blood vessels with destruction of the cell tissue.
- the probe according to the present invention can therefore be used for the treatment of intra-uterine haemorrhage in women. Since the probe causes destruction of the endometrium, it is also well suited to the sterilization of women.
- the probe 1 which is approximately 4 cm long and has a diameter of approximately 3 mm, is inserted into the uterine cavity and the patient is exposed to microwave radiation for a period of time which will vary from patient to patient. Apart from the coagulation of the endometrium the uterus is not affected as an organ, but is kept intact.
- the treatment can, for example, be performed under a local anaesthetic, usually PCB (paracervical blocking).
- Fig. 2 illustrates how the probe 1 according to the invention is used together with a microwave apparatus 5. The probe is then connected to a microwave generator 6 in the microwave apparatus 5 via the coaxial cable 4.
- the microwave apparatus can also be connected to a first temperature sensor 2 in order to record the temperature in the bladder and a second temperature sensor 3 in order to record the temperature in the rectum.
- the use of the temperature sensors 2, 3 during the treatment will further reduce a hypothetical risk of tissue damage outside the area which has to be treated with the probe 1. As already mentioned, with the probe according to the present invention this risk is extremely small, but nevertheless the use of the temperature probes represents an extra safety measure during the operation.
- a preferred version of the microwave apparatus weighs approximately 10 kg and the microwave generator 6 may typically emit a frequency of 2.45 GHz. At this frequency the power output of the microwave apparatus is, e.g., 600 watts. This output will diminish between the microwave generator 6 and the probe 1 due to loss in the coaxial cable 4, the energy radiated from the radiator A thus normally lying between 20 and 100 watts, depending on the regulation of the microwave generator's output.
- a probe is thereby provided for treatment of the mucous membrane of the uterus without risk to the patient while at the same time being inexpensive and simple to use.
Landscapes
- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Medical Informatics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Otolaryngology (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
Sonde pour un appareil à micro-ondes destiné au traitement in vivo, clinique et chirurgical de tissus, en particulier au traitement intra-utérin de l'endométriome. Un générateur de micro-ondes ménagé dans l'appareil à micro-ondes alimente la sonde en micro-ondes à travers un câble coaxial. Ce dernier est se termine par une structure telle qu'il agit comme un élément de rayonnement (A) de micro-ondes, lequel se présente sous forme d'une partie exposée de l'extrémité du conducteur interne dudit câble (4) d'un plan de masse (GP) ménagé derrière la partie exposée (A) du conducteur interne. Le plan de masse (GP) constitue ainsi la transition entre l'élément de rayonnement (A) et le câble coaxial (4), la longueur du plan de masse (GP) étant supérieure à celle de l'élément de rayonnement (A). Ceci implique que la sonde obtient une caractéristique de rayonnement symétrique plus ou moins isotrope, sans lobes de rayonnement dirigés vers l'arrière, ce qui implique par ailleurs que le positionnement de la sonde dans l'utérus n'est pas critique et que le risque de lésions produites dans les tissus qui ne doivent pas être traités est supprimé. Ceci rend la sonde particulièrement apte à être utilisée pour la stérilisation des femmes dans des conditions technologiquement peu avancées.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU75478/94A AU7547894A (en) | 1993-08-24 | 1994-08-24 | A probe for a microwave apparatus for clinical and surgical treatment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO933021 | 1993-08-24 | ||
NO933021A NO933021D0 (no) | 1993-08-24 | 1993-08-24 | Sonde for mikroboelgeapparat til klinisk og kirurgisk behandling |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995005869A1 true WO1995005869A1 (fr) | 1995-03-02 |
Family
ID=19896364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO1994/000137 WO1995005869A1 (fr) | 1993-08-24 | 1994-08-24 | Sonde pour appareil a micro-ondes destine aux traitements cliniques et chirurgicaux |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU7547894A (fr) |
NO (1) | NO933021D0 (fr) |
WO (1) | WO1995005869A1 (fr) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5769880A (en) * | 1996-04-12 | 1998-06-23 | Novacept | Moisture transport system for contact electrocoagulation |
US5776176A (en) * | 1996-06-17 | 1998-07-07 | Urologix Inc. | Microwave antenna for arterial for arterial microwave applicator |
US5800493A (en) * | 1995-04-26 | 1998-09-01 | Gynecare, Inc. | Intrauterine ablation system |
US7118590B1 (en) | 1999-02-25 | 2006-10-10 | Microsulis Limited | Radiation applicator |
EP2174614A1 (fr) | 2008-10-13 | 2010-04-14 | Vivant Medical, Inc. | Ensembles d'antenne pour applications médicales |
EP2229907A1 (fr) * | 2006-09-08 | 2010-09-22 | Renewave Medical Systems SA | Dispositif de traitement du tissu utérin par micro-ondes |
US8968292B2 (en) | 2009-02-20 | 2015-03-03 | Covidien Lp | Leaky-wave antennas for medical applications |
US8998898B2 (en) | 1996-04-12 | 2015-04-07 | Cytyc Surgical Products | Moisture transport system for contact electrocoagulation |
US9480527B2 (en) | 2010-03-08 | 2016-11-01 | Covidien Lp | Microwave antenna probe having a deployable ground plane |
US9554853B2 (en) | 1998-05-08 | 2017-01-31 | Hologic, Inc. | Radio-frequency generator for powering an ablation device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4448198A (en) * | 1979-06-19 | 1984-05-15 | Bsd Medical Corporation | Invasive hyperthermia apparatus and method |
WO1991002560A1 (fr) * | 1989-08-16 | 1991-03-07 | Deutsches Krebsforschungszentrum | Applicateur micro-ondes pour hyperthermie |
DE3831016C2 (fr) * | 1988-09-12 | 1992-11-19 | Deutsches Krebsforschungszentrum Stiftung Des Oeffentlichen Rechts, 6900 Heidelberg, De | |
EP0521264A2 (fr) * | 1991-07-03 | 1993-01-07 | W.L. Gore & Associates GmbH | Dispositif d'antenne avec alimentation |
US5220927A (en) * | 1988-07-28 | 1993-06-22 | Bsd Medical Corporation | Urethral inserted applicator for prostate hyperthermia |
-
1993
- 1993-08-24 NO NO933021A patent/NO933021D0/no unknown
-
1994
- 1994-08-24 AU AU75478/94A patent/AU7547894A/en not_active Abandoned
- 1994-08-24 WO PCT/NO1994/000137 patent/WO1995005869A1/fr active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4448198A (en) * | 1979-06-19 | 1984-05-15 | Bsd Medical Corporation | Invasive hyperthermia apparatus and method |
US5220927A (en) * | 1988-07-28 | 1993-06-22 | Bsd Medical Corporation | Urethral inserted applicator for prostate hyperthermia |
DE3831016C2 (fr) * | 1988-09-12 | 1992-11-19 | Deutsches Krebsforschungszentrum Stiftung Des Oeffentlichen Rechts, 6900 Heidelberg, De | |
WO1991002560A1 (fr) * | 1989-08-16 | 1991-03-07 | Deutsches Krebsforschungszentrum | Applicateur micro-ondes pour hyperthermie |
EP0521264A2 (fr) * | 1991-07-03 | 1993-01-07 | W.L. Gore & Associates GmbH | Dispositif d'antenne avec alimentation |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5800493A (en) * | 1995-04-26 | 1998-09-01 | Gynecare, Inc. | Intrauterine ablation system |
US9095348B2 (en) | 1996-04-12 | 2015-08-04 | Cytyc Surgical Products | Moisture transport system for contact electrocoagulation |
US5769880A (en) * | 1996-04-12 | 1998-06-23 | Novacept | Moisture transport system for contact electrocoagulation |
US9247989B2 (en) | 1996-04-12 | 2016-02-02 | Cytyc Surgical Products | Moisture transport system for contact electrocoagulation |
US8998898B2 (en) | 1996-04-12 | 2015-04-07 | Cytyc Surgical Products | Moisture transport system for contact electrocoagulation |
US5776176A (en) * | 1996-06-17 | 1998-07-07 | Urologix Inc. | Microwave antenna for arterial for arterial microwave applicator |
US9554853B2 (en) | 1998-05-08 | 2017-01-31 | Hologic, Inc. | Radio-frequency generator for powering an ablation device |
US7118590B1 (en) | 1999-02-25 | 2006-10-10 | Microsulis Limited | Radiation applicator |
EP2229907A1 (fr) * | 2006-09-08 | 2010-09-22 | Renewave Medical Systems SA | Dispositif de traitement du tissu utérin par micro-ondes |
EP2174614A1 (fr) | 2008-10-13 | 2010-04-14 | Vivant Medical, Inc. | Ensembles d'antenne pour applications médicales |
US9375272B2 (en) | 2008-10-13 | 2016-06-28 | Covidien Lp | Antenna assemblies for medical applications |
AU2009225331B2 (en) * | 2008-10-13 | 2013-07-18 | Covidien Lp | Antenna assemblies for medical applications |
US10058387B2 (en) | 2008-10-13 | 2018-08-28 | Covidien Lp | Antenna assemblies for medical applications |
US8968292B2 (en) | 2009-02-20 | 2015-03-03 | Covidien Lp | Leaky-wave antennas for medical applications |
US10080610B2 (en) | 2009-02-20 | 2018-09-25 | Covidien Lp | Leaky-wave antennas for medical applications |
US9480527B2 (en) | 2010-03-08 | 2016-11-01 | Covidien Lp | Microwave antenna probe having a deployable ground plane |
Also Published As
Publication number | Publication date |
---|---|
NO933021D0 (no) | 1993-08-24 |
AU7547894A (en) | 1995-03-21 |
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