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WO1990001353A1 - Applicateurs electrostatiques chauffant en profondeur - Google Patents

Applicateurs electrostatiques chauffant en profondeur Download PDF

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Publication number
WO1990001353A1
WO1990001353A1 PCT/US1988/002720 US8802720W WO9001353A1 WO 1990001353 A1 WO1990001353 A1 WO 1990001353A1 US 8802720 W US8802720 W US 8802720W WO 9001353 A1 WO9001353 A1 WO 9001353A1
Authority
WO
WIPO (PCT)
Prior art keywords
applicator
tissue
energy
resonant
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1988/002720
Other languages
English (en)
Inventor
William H. Harrison
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US07/006,219 priority Critical patent/US4823811A/en
Application filed by Individual filed Critical Individual
Priority to PCT/US1988/002720 priority patent/WO1990001353A1/fr
Publication of WO1990001353A1 publication Critical patent/WO1990001353A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/40—Applying electric fields by inductive or capacitive coupling ; Applying radio-frequency signals
    • A61N1/403—Applying electric fields by inductive or capacitive coupling ; Applying radio-frequency signals for thermotherapy, e.g. hyperthermia

Definitions

  • the resulting induced concentric electric field lines 34 are parallel to the body surface 36 and energy deposition in the deep muscle tissue 38 is not dependent upon electric field lines that must pass through the fat/skin layer 40.
  • Clinical experience with over 1000 patients shows that excessive surface heating is spared and deep heating is often achieved.
  • distilled water bags 64 are placed between the dipoles and the patient. This allows the dipole elements to function in a medium having a dielectric constant similar to muscle tissue (approximately 78) , thus enhancing the coupling and minimizing the discontinuity between the dipole elements and the body surface.
  • a dielectric constant similar to muscle tissue approximately 78
  • Prior art devices 2 through 5 are not resonant devices and a serious impedance mismatch with the 50 ohm line to the RF power source will result unless a water bolus is used as described. Moreover, the lack of a resonant structure limits the frequencies which may be employed in the devices. Additionally, in a clinical environment, it is preferable to use as simplified a device as possible and preferably a device that does not surround the patient.
  • a further object of the invention is to employ structures that do not surround the patient, to eliminate the need for side coupling elements and shield plates.
  • Fig. 11 is a graph showing the measured thermal pattern in an experiment employing the present invention as observed in a muscle equivalent phantom of the torso having the same cross-section as used in E-fiel measurements of Fig. 10;
  • Fig. 11 shows the thermal response after applying 800 watts for 8 minutes.
  • Fig. 12 shows that a similar heating pattern was obtained when the duration was increased to 15 minutes. As is shown, relatively uniform heating is obtained at any depth in the desired cross-section. The thermal increase in the center of the phantom was approximately 15% less than that obtained at the bottom surface, but it was also abou 10% greater than that at the top surface.
  • the two sets of plates 82-84 are connected by the coils 95 and RF energy is coupled to one of the coils as shown at 94.
  • the plates on opposite sides of the gap produce a difference of potential across the gap region 86 that is an aperture or RF coupling mechanism through which energy is transferred to the body.
  • the relatively large surfaces of the plates in terms of body dimensions, provide a large distributed capacitive coupling to the body on either side of the gap region that provides an efficient aperture through which the RF energy is launched into the body. This is further verified with measurement data.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Electrotherapy Devices (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)

Abstract

Un applicateur électrostatique chauffant en profondeur dépose une énergie HF d'une manière relativement uniforme sur toute une section transversale donnée du torse humain, ayant ainsi pour résultat un chauffage uniforme similaire de la région. L'applicateur utilise une paire d'applicateurs rectangulaires (70), plats (82) ou cylindriques produisant un champ électrique produisant de la chaleur parallèl à l'axe principal du corps (74) de manière à réduire au minimum le chauffage en surface excessif. Ledit applicateur trouve une utilisation particulière dans le traitement de cancers profonds chez des patients. Il suffit de le placer près du torse pour un fonctionnement satisfaisant, permettant ainsi un espace d'air relativement grand entre ledit applicateur et le patient. Il nécessite un temps de montage très court, est facile à utiliser et ne présente aucun danger pour le patient.
PCT/US1988/002720 1987-01-23 1988-08-11 Applicateurs electrostatiques chauffant en profondeur Ceased WO1990001353A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US07/006,219 US4823811A (en) 1987-01-23 1987-01-23 Electrostatic deep heating applicator
PCT/US1988/002720 WO1990001353A1 (fr) 1988-08-11 1988-08-11 Applicateurs electrostatiques chauffant en profondeur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1988/002720 WO1990001353A1 (fr) 1988-08-11 1988-08-11 Applicateurs electrostatiques chauffant en profondeur

Publications (1)

Publication Number Publication Date
WO1990001353A1 true WO1990001353A1 (fr) 1990-02-22

Family

ID=22208832

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1988/002720 Ceased WO1990001353A1 (fr) 1987-01-23 1988-08-11 Applicateurs electrostatiques chauffant en profondeur

Country Status (1)

Country Link
WO (1) WO1990001353A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2203701C2 (ru) * 2001-04-04 2003-05-10 Казанский государственный технический университет им. А.Н. Туполева Способ формирования распределения электромагнитного сигнала в системе излучателей для сверхвысокочастотной гипертермии (варианты)
WO2005110544A1 (fr) * 2004-05-07 2005-11-24 Therm Med Llc Procede et systeme destines a produire une hyperthermie induite par radiofrequence
US7510555B2 (en) 2004-05-07 2009-03-31 Therm Med, Llc Enhanced systems and methods for RF-induced hyperthermia
US7627381B2 (en) 2004-05-07 2009-12-01 Therm Med, Llc Systems and methods for combined RF-induced hyperthermia and radioimmunotherapy
EP4427801A1 (fr) * 2023-03-07 2024-09-11 Fluxmetrix Ltd Appareil pour générer un champ magnétique

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB425803A (en) * 1933-05-23 1935-03-21 Robert Pierre Ernest Leroy Improvements in apparatus for the production of artificial fever
US2044257A (en) * 1930-11-18 1936-06-16 Siemens Reiniger Werke Ag Apparatus for electromedical treatment
FR807349A (fr) * 1936-06-15 1937-01-09 Dispositif pour le traitement thérapeutique à l'aide de champs alternatifs à haute fréquence, notamment à l'aide d'ondes courtes
US2130758A (en) * 1935-06-01 1938-09-20 E J Rose Mfg Company Of Califo Electrode for diathermy treatment and the like
US4028518A (en) * 1974-06-18 1977-06-07 L'oreal Device for superficially heating an adjacent body
CA1177895A (fr) * 1980-04-29 1984-11-13 Larry Norton Appareil pour accroitre l'activite in-vivo des medicaments contre le cancer
US4672980A (en) * 1980-04-02 1987-06-16 Bsd Medical Corporation System and method for creating hyperthermia in tissue

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044257A (en) * 1930-11-18 1936-06-16 Siemens Reiniger Werke Ag Apparatus for electromedical treatment
GB425803A (en) * 1933-05-23 1935-03-21 Robert Pierre Ernest Leroy Improvements in apparatus for the production of artificial fever
US2130758A (en) * 1935-06-01 1938-09-20 E J Rose Mfg Company Of Califo Electrode for diathermy treatment and the like
FR807349A (fr) * 1936-06-15 1937-01-09 Dispositif pour le traitement thérapeutique à l'aide de champs alternatifs à haute fréquence, notamment à l'aide d'ondes courtes
US4028518A (en) * 1974-06-18 1977-06-07 L'oreal Device for superficially heating an adjacent body
US4672980A (en) * 1980-04-02 1987-06-16 Bsd Medical Corporation System and method for creating hyperthermia in tissue
CA1177895A (fr) * 1980-04-29 1984-11-13 Larry Norton Appareil pour accroitre l'activite in-vivo des medicaments contre le cancer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Volume MTT-32, No. 8, issued August 1984, P. RASKMARK.: "Focused Electromagnetic Heating of Muscle Tissue", see pages 887-888. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2203701C2 (ru) * 2001-04-04 2003-05-10 Казанский государственный технический университет им. А.Н. Туполева Способ формирования распределения электромагнитного сигнала в системе излучателей для сверхвысокочастотной гипертермии (варианты)
WO2005110544A1 (fr) * 2004-05-07 2005-11-24 Therm Med Llc Procede et systeme destines a produire une hyperthermie induite par radiofrequence
US7510555B2 (en) 2004-05-07 2009-03-31 Therm Med, Llc Enhanced systems and methods for RF-induced hyperthermia
US7627381B2 (en) 2004-05-07 2009-12-01 Therm Med, Llc Systems and methods for combined RF-induced hyperthermia and radioimmunotherapy
EP2345453A3 (fr) * 2004-05-07 2011-11-09 Therm Med LLC Systèmes d'hyperthermie induite par RF
EP4427801A1 (fr) * 2023-03-07 2024-09-11 Fluxmetrix Ltd Appareil pour générer un champ magnétique

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