27 research outputs found
ç±ãçºçããªã现èå®éšçšã®äº€æµç£ççºçè£ çœ®ã®å®çŸ
é沢倧åŠç°æ¥æ¬æµ·åç°å¢ç 究ã»ã³ã¿ãŒç 究ã®ç®ç亀æµç£çæé²ã«ããæããå€è¬å¹äœçšã®å¢åŒ·""ãšèšãç 究ããããéåžžã«å°æ¥æ§ã®ããç 究ã§ããããã€ããã€ã·ã³ã§ã30mTã«ãŠ1.8åã®å¢åŒ·ãšããããé¡èãªå¹æãšããŠ4å以äžã®å¹æãã»ãããšããã§ãããå®éšã§30mTã50mTãŸã§ãããªãã®ã¯ã现èå®éšå¯èœãªäº€æµç£ççºçè£
眮ãåžè²©ã«ç¡ãã補äœãçºç±ã®åé¡ãããå°é£ã§ããããã§ãããä»åã¯ç±ãçºçãããªã现èå®éšçšäº€æµç£ççºçè£
眮ãç®çãšããã1. 匷åãªæ°žä¹
ç£ç³ãã¢ãŒã¿ãŒé«éå転ããã亀æµç£çãå®çŸããããšã§åºæ¬çã«çºç±ã®ç¡ãç£ççºçè£
眮ãå®çŸããããšãã§ããããšãŒã¯ã工倫ããããšã§200mT以äžãå®çŸã§ãããšæãããã2. é«éå転éšåã¯å±éºã§ãã现èå®éšã®ç©ºéãšãã¢ã«ãæ¿ãªã©ã§é®èœããå¿
èŠãããããã®ãããšãŒã¯ãçšããŠå®çŸãããããšãŒã¯ã䜿çšãããšç£ååžçãè¡ããã³ãã³ã°(å転ã®ã ã©)ã®ããæ¯åãçºçããããã®ã³ãã³ã°ãé²æ¢ããããã®ç£ç³ãè¿œå ããããšã§å¯Ÿçå¯èœãšæããããç 究èšç»ãšçµæ1. ç£çã·ãã¥ã¬ãŒã·ã§ã³ã§ã®æ€èšãšãšãŒã¯éšãæ°žä¹
ç£ç³ãæ©æ§éšã®èšèšã·ãã¥ã¬ãŒã·ã§ã³ã§ã¯ç£ç匷床ã¯å¯èœã§ãã£ããã圢ç¶ãç¹æ®ãªãã®ã¯éåžžã«é«äŸ¡ã«ãªãæéçã«ãäžéœåã§ããããšããäžè¬çãªãã®ããéžæãããšãç£ç匷床ã¯åœåäºå®ã®ååçšåºŠã«ãªã£ãŠããŸã£ãã2. æ©æ§éšã®è£œäœã§ã¯ãæ°žä¹
ç£ç³ã®åãæ±ãã容æã§ã¯ç¡ããæå
¥æ²»å
·ã®å·¥å€«ãå¿
èŠã§ãã£ãã3. ãŸãšã äžçªå€§ããªåé¡ãŠããŠãæ¯åã®åé¡ãçºçãããçµæãšããŠ30HzçšåºŠããçºçã§ãããæ©æ§éšã®å
šé¢çãªåèšèšãæ±ãããããæéçã«å®çŸã§ããªãã£ããæ¯å察çãšããŠæ©æ¢°ç匷床ã§å¯Ÿçããã®ã¯é£ãããç£æ°åè·¯ã§ã®å¯Ÿçãå¿
èŠãšæããããç£æ°åè·¯ã«ã¹ã€ããçãªèŠçŽ ãçµã¿èŸŒãããšã§æ¹åã§ãããã§ãã£ããæéçã«éã«åããæ®å¿µã§ããããã®ããŒãã¯ããã«ç 究ãç¶ããããæåãã倧ããªãã®ãäœãããå°åã®ãã®ã§è©Šäœããæ¹ãè¯ãã£ããšåçããŠãããç 究課é¡/é åçªå·:15H00350, ç 究æé(幎床):201
ç£çå ±é³ŽåŒã¯ã€ã€ã¬ã¹é»åäŒéãå©çšããèªå°å æž©æž©ç±æ²»ççšã®å±ç£ã³ã€ã«ã®ç 究
é沢倧åŠç°æ¥æ¬æµ·åç°å¢ç 究ã»ã³ã¿ãŒå®æœèšç»ã®çµæ,1.å®éšè£
眮ã補äœããç 究ã®ç®çã«ç€ºããã110KHzã«ãããŠQ;440ã®å
±æ¯åè·¯ãå®çŸããã(èšç»ã§ã¯400)ãŸãé§åé«åšæ³¢é»æºãšã®ã€ã³ããŒãã³ã¹ãããã³ã°ã®ããã®ãã©ã³ã¹ãçšæããã³ã€ã«é»æµã®æž¬å®çšã«CTãèšçœ®ãããã³ã€ã«ééã¯JISL4005ã®è³æãåèãšã95%280mmãšãããçµåä¿æ°ã¯0.0434ã枬å®ã2.ç£çæ§èœã®ç¢ºèªã§ã¯ãããã¯ã¢ããã³ã€ã«ã«ããç£çååžã枬å®ããã3.é»æµã®äœçžãCTã§ã¯ãªããåå
çŽ åã«PINãã©ããã€ãªãŒãã䜿çšãéæ¥è§Šã§æ€åºããããšããããåå
çŽ åã®å¿çé
ãã倧ãããå®éšçã«ãå©çšã¯é£ããçµæãšãªã£ãã4.ä»åã®æ¹åŒã§ã¯åºæ¬çã«ã³ã€ã«éè·é¢ãšæž©åºŠå€åãªã©ã§ãå
±æ¯åšæ³¢æ°ã倧ããå€åãããQãéåžžã«å€§ãããã110kHzã«å¯ŸããŠãããæ°10Hzã®å€åã§ã倧ããåºåãå€åãããå®çšçã«ã¯èªåè¿œåŸãå¿
é ã§ãã粟å¯ãªå¶åŸ¡ãå¿
èŠãšãªãããŸãšã1.äž»ãªç®çãšããç£çå
±é³ŽåŒã¯ã€ã€ã¬ã¹é»åäŒéã¯ãQãé«ãå
±æ¯åè·¯ãå®çŸããããšã«ãããéåžžã«å¹çããå±ç£ããããšãã§ãããèšç»æã®ã·ãã¥ã¬ãŒã·ã§ã³ã®çµæãšç£çååžã¯åããã®ãå®çŸã§ããä»åŸã®çºå±ãæåŸ
ã§ãããã¡ãªã¿ã«é»åäŒéãšããŠå¿çšå®éšããå Žåã§ãã400mmã®ã³ã€ã«éè·é¢ã§100Wã«ãŠ95%ã®å¹çã枬å®ãããåºæ¬çã«ã¯æå以äžã®çµæã ãšæãããã2.ç£çå
±é³ŽåŒã¯ã€ã€ã¬ã¹é»åäŒéã§ã¯ãéåžžã«å€§ããªQã®å
±æ¯åè·¯ãå®çŸããããšã§ããšãã«ã®ãŒäŒéå¹çãéåžžã«åäžããããããäžæ¹ã§ã³ã€ã«éè·é¢ã®å€åã枩床å€åã«ãããå
±æ¯åšæ³¢æ°ã倧ããå€åã,é§ååè·¯ãé£ãããªããä»åã®å®éšã§ã¯ã¢ããã°åè·¯ã«ããåšæ³¢æ°èªåè¿œåŸã¯ç¡çã§ãã£ããããžã¿ã«åè·¯ã®å¿çšã«ãããå®å®ãªå¶åŸ¡æ¹æ³ãå®çŸã§ãããšæãããã3.èªå°åŽã³ã€ã«ã®é»æµäœçžãéæ¥è§Šã§æ€åºãããã£ãããå®å®åºŠãåºããªãã£ããããã«ã€ããŠã¯äžè¬çãªé«åšæ³¢CTã«ããå®éšãç¶ç¶ããããä»åŸã®æ€èšèª²é¡ãšããããç 究課é¡/é åçªå·:24918005, ç 究æé(幎床):201
Heat Generation Ability of Ferromagnetic Implants in Hyperthermia
In this paper, proposed implants in literature are compared in terms of the ability to heat generation in electromagnetic thermotherapy. To destroy the tumor cells, their temperature must rise above 42.5oC. The magnitude of the temperature rise depends strongly on the thermal conductivity of the tissue that has not been considered in most studies. For this reason, liver tissue is modeled using bioheat transfer equation that is coupled to the electromagnetic equations and electrical circuits by employing Multiphysics finite element package COMSOL, in order to create the numerical model of the system
ã¯ã€ã€ã¬ã¹é»åäŒéãå©çšããããæž©ç±æ²»ççšã³ã€ã«ã§ç£çååžãå€æ§ã«å¶åŸ¡ããæ¹æ³
é沢倧åŠç°æ¥æ¬æµ·åç°å¢ç 究ã»ã³ã¿ãŒç£çå
±é³ŽåŒã¯ã€ã€ã¬ã¹é»åäŒéã¯å±ç£åŽãšèªå°åŽã®2ã€ã®å
±æ¯åè·¯ãæã€ããšã§å¹çã®è¯ãé»åäŒéãè¡ãæ¹åŒã§ãããæšå¹Žã®ç 究ã§ãç£çå
±é³ŽåŒã¯ã€ã€ã¬ã¹é»åäŒéæ¹åŒãçšããããšã§ã³ã€ã«éã«å¹ççã«åŒ·åãªç£çãçºçãããããšã確èªã§ããããŸãé»çã®åœ±é¿ãéåžžã«å°ãªãããããšã確èªã§ããã次ã«ç£çã«ããäœå
ã«ã¯ããé»æµãæµãçºç±çŸè±¡ãèµ·ããåé¡ãããããšãŠãç¡èŠã§ããªããã®ã§ãããçºç±ã¯ç£æå¯åºŠã®2ä¹ãåšæ³¢æ°ã«æ¯äŸããŠçºç±éã決ãŸããã枊é»æµã¯ç£æå¯åºŠã®2ä¹ãåšæ³¢æ°ã®2ä¹ã«æ¯äŸããŠçºç±éã決ãŸãããã®ããããŸãé«ãåšæ³¢æ°ãçšããããšãã§ããªãåé¡ãããããããŸã§ã®ç 究ã§çšããããŠããç£æ§çºç±äœã§ã¯ã100kHzçšåºŠãéçãšæãããŠãããåœç 究ã§ã¯æ£éšä»¥å€ã®éšåã®ç£ç匷床ãäžããããšã§ã枊é»æµã50%以äžã«æžããããšã«æåããããã ãç£æå¯åºŠã®ååžã¯å®éã®äººäœã®å€§ãããæ³å®ããç£ççºçè£
眮ãå¶äœã確èªãããã人äœå
éšã®æžŠé»æµã«ã€ããŠã¯éåžžã«åçŽãªäººäœã¢ãã«ã«ããã·ãã¥ã¬ãŒã·ã§ã³ã«ãã確èªãããã®ã§ãããçµæçã«ç£ç匷床ã25%äžããããšããåšæ³¢æ°ã25%äžããããšãå¯èœã«ãªã£ããæ²»çã«ã¯éåžžã«æå¹ã ãšæããããå®çŸæ¹æ³ã§ãããã2ã€ã®å
±æ¯åè·¯ã®å
±æ¯åšæ³¢æ°ã±8%çšåºŠã®å·®ãèšããããšã§å±ç£åŽã³ã€ã«ãšèªå°åŽã³ã€ã«ã®é»æµã2å以äžã®å·®ãçºçãããããšã§ããã泚ç®ãã¹ãã¯ãå±ç£åŽãããèªå°åŽ(é»æºã®ä»ããŠããªãã³ã€ã«)ã«2å以äž3åè¿ãã®é»æµãæµãããšãå¯èœã«ãªã£ããšèšãããšã§ããã(5ã¿ãŒã³Q=500以äž400A120kHz)ç 究課é¡/é åçªå·:25918003, ç 究æé(幎床):2013-04-01 â 2014-03-3
ã¯ã€ã€ã¬ã¹çµŠé»çšã®åå°äœåè·¯ã§å®çŸããã€ã³ããŒãã³ã¹ã»ãããã³ã°é§ååè·¯
é沢倧åŠç°æ¥æ¬æµ·åç°å¢ç 究ã»ã³ã¿ãŒâç 究ç®ç倧é»åã¯ã€ã€ã¬ã¹çµŠé»è£
眮ã®å
±æ¯éšãé§åããåè·¯ã§ã¯ãã€ã³ããŒãã³ã¹ã»ãããã³ã°ã»ãã©ã³ã¹ã§é«åšæ³¢é»æºãšè² è·ã®ã€ã³ããŒãã³ã¹ãåãããŠããããããå®éšã§ã¯è² è·ã®ã€ã³ããŒãã³ã¹ãå€åããŠååãªé»åãéããªããªãããŸãå·»ãæ°æ¯ã10:1以äžã«ãªããšæŒãç£æã倧ãããªãé»æµã®æ倧å€ãšé»å§ãšé»æµã®äœçžã0床ã«ãªãç¹ãåããªããªãã倧é»ã«ã¯ã€ã€ã¬ã¹çµŠé»ã¯å¹çãæ±ããããéåžžã«é«ãQã®å
±æ¯åè·¯ã䜿çšããããããã³ã°ã»ãã©ã³ã¹ã®å·»ãæ°æ¯ãéäžã§å€æŽããããšãã§ããæ©ã¿ã®çš®ã§ãã£ããâç 究æ¹æ³ããã§âã¯ã€ã€ã¬ã¹çµŠé»çšã®äœã€ã³ããŒãã³ã¹å
±æ¯åè·¯ãåå°äœåè·¯é§åããåè·¯âã§ããã確èªæ¡ä»¶ãšããŠãåšæ³¢æ°ã¯200kHzãé»æµã¯æ倧50Aãšããå
±æ¯åè·¯ã®ã€ã³ããŒãã³ã¹ã¯0.01Ωãã1Ωãšãããé§ååè·¯ãšããŠã¯äžè¬çãªããŒãããªããžåè·¯ã§ãããPWMã§å·»ãæ°æ¯ã«çžåœããé»å§æ¯ãå®çŸãããåççã«ã¯å€ãåè·¯ã§ãããã3ã€ã®æ°æè¡ã§ä»åã®çšéãå¯èœã«ãªããâ . è¿å¹Žã®äœONæµæMOSFETã¯1mΩãåããã®ããããåŸæ¥ã§ã¯é§åã§ããªãã£ã極äœã€ã³ããŒãã³ã¹è² è·(äŸãã°0.01Ω)ãå¹ççã«é§åå¯èœãšãªã£ããâ¡. ãããã¿ã€ã ãæå°æéã«èªå調ç¯ããæ©èœãéçºãããããããã¿ã€ã äžã¯å¯çãã€ãªãŒãã«é»æµãæµãããããäŸãã°0.8Vx50Aã§ã¯40Wã«ããªããããã®æ倱ãåçã«æžããããšãã§ãããâ¢. è¶
å°å倧容éäœERSã»ã»ã©ããã¯ã³ã³ãã³ãµã«ãããåºæ¿äžã§1MHz 50Aãå¯èœãªãã«ãããªã³ã°åè·¯ãåããŠå®çšå¯èœãšãªã£ããâç 究ææå®éšã®çµæãåœåæ³å®ããé»æµã®25%çšåºŠããæµããããªãã£ããåå ãšããŠéåžžã®ããªã³ãåºæ¿ãå©çšãããããé
ç®ã®åã¿ã35ÎŒmã§ããçºç±ããããã ãšæããããé
ç®ã®åã¿ã210ÎŒmã§ããã°çµæãéããšæãããããéåžžã«é«äŸ¡ãªåºæ¿ã§ãããäºç®çã«ãæéçã«ãéã«åããªãã£ãã®ã¯æ®å¿µã§ãããããåºæ¬çãªèãæ¹ã«åé¡ã¯ç¡ãããšã確èªã§ããã®ã¯ãææã§ãããç 究課é¡/é åçªå·:17H00353, ç 究æé(幎床):201
Wireless Power Transfer System for Hyperthermia Therapy
Hyperthermia therapy attracts attension as a low-inversive target treatment for deep-positioned cancer. One of the hyperthermia therapies is hgh-frequency induction heating type by using nano-mgnetic materials and magnetic implants. A tumor with injected magnetic materials is heated by hysteresis loss and eddy-current loss under high frequency magnetic fields with a few handred kHz and a few mT. To generate magnetic fields at the deep position of body, we proposed double pancake type exciting system that consists with two flat coils at both sides of body. This paper discusses a wireless exciting system to generate AC magnetic fields rather than transmit energy to load. The experimantal results proved that a wireless transmission enables us to excite two pancake coils and generate magnetic fields in deep position like series-connected coils
Fluctuation of Resonance Frequency of Applicator Having Wireless Power Transmission for Hyperthermia Therapy
One of the hyperthermia therapies is hgh-frequency induction heating type by using nano-mgnetic materials and magnetic implants. A tumor with injected magnetic materials is heated by hysteresis loss and eddy-current loss under high frequency magnetic fields with a few handred kHz. To generate magnetic fields at the deep position of a body, we proposed a double pancake type exciting system with wireless power transmission. Since this system is constituted by two tuned resonant circuits, the characteristic is sensitive to the change of parameters. This paper discusses the fluctuations of resonance frequency depending on the change of a distance between the exciting and induced coils and resonance capacitor. As a result, we recognized the fluctuation range of the resonance frequency for a tuned exciting power source
Control of Exciting Frequency to Pancake Type Applicator Having Wireless Transmission for Hyperthermia Therapy
The hyperthermia as one of low-invasive therapies was taken notice of in aging society. There is a magnetic generating coil system, an applicator, as one research issue of the engineering developments in the medical treatment system. The proposed applicator system with the wireless transmission can be set a patient to operating bed easily and the gap between two flat coils can be adjusted to the breast thickness of a patient. But on the other hand, the distance between coils changes a mutual inductance and influences the characteristics of circuit and magnetic fields. This paper estimates the characteristics on the variation range of electric parameters by change of the size of exciting coils, and proposes the control methodology of the parameter fluctuation by a control of exciting frequency. The feasibility and performances of the apparatus were discussed by the simulation and the experiment
Antitumor effects of inductive hyperthermia using magnetic ferucarbotran nanoparticles on human lung cancer xenografts in nude mice
Background: The effects of inductive hyperthermia on lung cancer have yet to be fully investigated. Magnetic nanoparticles used in inductive hyperthermia are made-to-order and expensive. This study was performed to investigate the use of ferucarbotran in inductive hyperthermia and to clarify whether inductive hyperthermia using ferucarbotran promotes antitumor effects in vivo using a lung cancer cell line. Methods: We injected A549 cells subcutaneously into the right thighs of BALB/c nu/nu nude mice. Forty mice with A549 xenografts were then classified into three groups. Group 1 was the control group. All mice in groups 2 and 3 had ferucarbotran injected into their tumors, and mice in group 3 were then subjected to alternating magnetic field irradiation. We evaluated tumor temperature during the hyperthermic procedure, the time course of tumor growth, histologic findings in tumors after hyperthermic treatment, and adverse events. Results: Intratumor temperature rose rapidly and was maintained at 43°C-45°C for 20 minutes in an alternating magnetic field. Tumor volumes in groups 1 and 2 increased exponentially, but tumor growth in group 3 was significantly suppressed. No severe adverse events were observed. Histologic findings for the tumors in group 3 revealed mainly necrosis. Conclusion: Inductive hyperthermia using ferucarbotran is a beneficial and promising approach in the treatment of lung cancer. Ferucarbotran is a novel tool for further development of inductive hyperthermia. © 2013 Araya et al, publisher and licensee Dove Medical Press Ltd