Gotowa bibliografia na temat „Transducteur torique”
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Rozprawy doktorskie na temat "Transducteur torique"
Sanchez, Marine. "Développement d’un transducteur torique extracorporel et du principe de focalisation multi-torique en vue du traitement des adénocarcinomes mammaires par ultrasons focalisés de haute intensité". Electronic Thesis or Diss., Lyon, 2020. http://www.theses.fr/2020LYSE1243.
Pełny tekst źródłaHigh Intensity Focused Ultrasound (HIFU) is a technique commonly used in the medical field for the treatment of solid tumors. This therapeutic strategy allows for the localized destruction of biological tissue by temperature elevation. This manuscript describes the design and utilization of a therapeutic system and a novel, patented focalization technique for non-invasive treatment of mammary adenocarcinomas. In a first instance, an existing device that has been previously used for intraoperative treatment of hepatic metastases, and one that is currently undergoing clinical trials, was used. An ex vivo study on human mammary samples demonstrated the possibility of applying pressures on deep tissue layers in a non-invasive manner. Based on this study, the development of a new focalization modality was developed to provide larger treated volumes while yielding treatment times under a minute and eliminating the need for mechanical steering of the device. This new modality provided treated volumes 30% larger than those produced by the existing device with no changes to treatment time. Given the limitations of the existing device, in addition to the need of integrating the new focalization strategy, a new device was designed and specifically fabricated to meet the demands for treating mammary adenocarcinomas. The natural focalization of this novel transducer allows for depositing pressure deep in tissue. When the new focalization modality is used, a larger pressure field produces increased treated volumes. The performance provided by the novel probe was first characterized through modeling studies. These results were then validated through preliminary in vitro studies on hepatic tissues as well as in ex vivo studies on human mammary tissue samples. This work represents the first stage of development of a HIFU treatment for mammary adenocarcinomas using a novel, non-invasive and image-guided HIFU device that can be used manually
N'Djin, William Apoutou. "Transducteur torique à Ultrasons Focalisés de Haute Intensité pour générer des ablations volumineuses : applications précliniques pour le traitement des métastases hépatiques de cancers colorectaux". Lyon 1, 2008. http://www.theses.fr/2008LYO10313.
Pełny tekst źródłaAn ultrasound therapeutic medical device dedicated for the thermal ablation of liver metastases from colorectal cancers (LMCC) during an open procedure was developed and validated at a preclinical stage in a pig model. The aim of this study was to propose a HIFU device complementary to surgical liver resection. A toroïdial-shaped HIFU transducer with integrated ultrasound imaging was developed for creating large single lesions (7cm3, 40s). The characteristics of these lesions were studied numerically, during in vivo preclinical evaluations. Ballistic studies introduced a model of tumor-mimic embedded in the liver. Its acoustical characteristics were found to be adequate for HIFU ablation. The therapeutic strategy (open procedure, HIFU exposures parameters, ultrasound guidance) allowed the treatment of the tumor-mimics with negative margins. Homogeneous ablations were also performed in the vicinity of vessels up to 8 mm in diameter in less accessible regions (cavo-hepatic junction). Then, the toroïdial-shaped HIFU device was used for assisting surgical resection. The method enhances significantly vascular control during resection. Finally, in vivo liver motion effects on HIFU treatments were studied in a combined method included modeling and acquisition of preclinical ultrasound images in animals. An in vivo study has demonstrated that using this HIFU device during an open procedure allows creating ablations that are identical to those created during apnea. On the basis of these results, a clinical study will be started at the cancer center Léon Bérard with the toroïdial-shaped HIFU medical system by using the HIFU exposure strategy determined in this work
Vincenot, Jérémy. "Transducteurs toriques peropératoires et extracorporels destinés au traitement des tumeurs hépatiques et pancréatiques par ultrasons focalisés de haute intensité". Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10161.
Pełny tekst źródłaHigh intensity focused ultrasound (HIFU) allows the destruction of biological tissue by temperature increase. This technique is commonly used in the medical world for treating certain types of tumor masses. The project described in this document details the development and use of two independent therapy systems, with the main objective to treat intraoperatively and extracorporeally liver tumors. As a first step, an existing surgical system, intended to treat liver metastases and under clinical evaluation, was used. The establishment of a treatment modality based on electronic focusing has contributed to increase the coagulation volume and thus simplify the operative procedure. Based upon the findings of this first study, a second version of intraoperative probe was modeled and developed. The geometry of this new transducer allowed to change the shape of produced ablations. The performance of this probe were evaluated numerically and then validated with in vitro and in vivo studies. The effectiveness, simplicity and reproducibility of the treatments performed in the liver led to a possible application of the device to pancreatic cancer. After numerical study and in vitro feasibility assessment, animal model validation was also undertaken. All the results obtained during the peroperative treatments was used to study the feasibility of an extracorporeal treatment. A theoretical study has led to the development of an experimental prototype. After calibration, preliminary in vitro results were obtained
Vincenot, Jérémy. "Transducteurs toriques peropératoires et extracorporels destinés au traitement des tumeurs hépatiques et pancréatiques par ultrasons focalisés de haute intensité". Electronic Thesis or Diss., Lyon 1, 2013. http://www.theses.fr/2013LYO10161.
Pełny tekst źródłaHigh intensity focused ultrasound (HIFU) allows the destruction of biological tissue by temperature increase. This technique is commonly used in the medical world for treating certain types of tumor masses. The project described in this document details the development and use of two independent therapy systems, with the main objective to treat intraoperatively and extracorporeally liver tumors. As a first step, an existing surgical system, intended to treat liver metastases and under clinical evaluation, was used. The establishment of a treatment modality based on electronic focusing has contributed to increase the coagulation volume and thus simplify the operative procedure. Based upon the findings of this first study, a second version of intraoperative probe was modeled and developed. The geometry of this new transducer allowed to change the shape of produced ablations. The performance of this probe were evaluated numerically and then validated with in vitro and in vivo studies. The effectiveness, simplicity and reproducibility of the treatments performed in the liver led to a possible application of the device to pancreatic cancer. After numerical study and in vitro feasibility assessment, animal model validation was also undertaken. All the results obtained during the peroperative treatments was used to study the feasibility of an extracorporeal treatment. A theoretical study has led to the development of an experimental prototype. After calibration, preliminary in vitro results were obtained
Cambronero, Sophie. "Développement d’un traitement non invasif des tumeurs hépatiques par ultrasons focalisés". Electronic Thesis or Diss., Lyon 1, 2022. http://www.theses.fr/2022LYO10234.
Pełny tekst źródłaHigh-intensity focused ultrasound (HIFU) is a non-invasive treatment modality for solid tumors that provides a localized destruction of deep tissues. The work in this manuscript describes the development of treatment strategies and the design of a toroidal HIFU transducer dedicated to the non-invasive treatment of liver tumors. First, an existing toroidal HIFU device designed for an intraoperative treatment of liver tumors was used to expand the prospects for intraoperative treatment of tumors localized at the hepato-caval confluence. This treatment approach was evaluated in a preclinical study and showed the feasibility of the procedure and the tolerance of the treatment. This same device was then used to evaluate the feasibility of a completely non-invasive HIFU treatment with a toroidal transducer. The feasibility and safety of this non-invasive treatment was demonstrated in a preclinical study in the porcine model. This work highlighted the need for personalized non-invasive HIFU treatments to spare healthy intermediate tissues. Based on these experiences, a new targeting system was developed to ensure an accurate targeting of non-invasive HIFU treatments performed near risky structures. The performance of the new system has been demonstrated on two in vivo protocols for the treatment of the TTTS (Twin to Twin Transfusion Syndrome) and bladder trigone tumors. A new HIFU treatment device was then designed and developed for the non-invasive treatment of liver tumors. The specific cut of this truncated toroidal transducer allows an enlargement of the treated volume without mechanical displacement of the transducer. The therapeutic performance of this device has been evaluated on in vitro and in vivo experiments in the porcine model. This work represents the first step of a non-invasive treatment of hepatic tumors with a toroidal HIFU transducer