{"id":87692,"date":"2019-05-06T06:19:29","date_gmt":"2019-05-06T06:19:29","guid":{"rendered":"https:\/\/\/production-denergie-piezoelectrique-pour-les-implants-medicaux\/"},"modified":"2019-05-06T06:19:29","modified_gmt":"2019-05-06T06:19:29","slug":"production-denergie-piezoelectrique-pour-les-implants-medicaux","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/production-denergie-piezoelectrique-pour-les-implants-medicaux\/","title":{"rendered":"Production d’\u00e9nergie pi\u00e9zo\u00e9lectrique pour les implants m\u00e9dicaux"},"content":{"rendered":"

La r\u00e9cup\u00e9ration d’\u00e9nergie dans le corps humain (environ 100 W de consommation au repos) sous diff\u00e9rentes formes appara\u00eet comme une source d’alimentation presque parfaite pour les dispositifs m\u00e9dicaux implant\u00e9s, mais des probl\u00e8mes pratiques ont emp\u00each\u00e9 son adoption. Une \u00e9quipe de recherche de la Thayer School of Engineering du Dartmouth College a collabor\u00e9 avec UT Health San Antonio (filiale de l’Universit\u00e9 du Texas) a mis au point un nouveau moyen de fabrication d’un g\u00e9n\u00e9rateur pi\u00e9zo pour ces dispositifs m\u00e9dicaux.<\/p>\n

Leur approche utilise une combinaison de mat\u00e9riaux de conversion d’\u00e9nergie \u00e0 couche mince avec une conception m\u00e9canique peu invasive. Les travaux et les r\u00e9sultats sont d\u00e9taill\u00e9s dans l\u2019article intitul\u00e9  \u201cFlexible Porous Piezoelectric Cantilever on a Pacemaker Lead for Compact Energy Harvesting\u201dpubli\u00e9 dans Advanced Materials Technologies.<\/p>\n

Fournir de l’\u00e9nergie par un implant  est un d\u00e9fi de taille. Il faut cr\u00e9er une source d’\u00e9nergie efficace pour que l’appareil fonctionne tout au long de la vie du patient, sans qu’il soit n\u00e9cessaire pour celui-ci de subir une intervention chirurgicale pour remplacer la pile. L’appareil ne doit pas interf\u00e9rer avec le fonctionnement du corps. Il doit de plus \u00eatre biocompatible, l\u00e9ger, flexible et discret, et \u00eatre non seulement compatible avec la structure actuelle du stimulateur cardiaque, mais \u00e9galement \u00e9volutif pour la multifonctionnalit\u00e9 future.<\/p>\n

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Fig 1 R\u00e9cup\u00e9ration d\u2019\u00e9nergie \u00e0 double cantilever en PVDF-TrFE sur le fil de l’AICD (A). Image de l’analyse vid\u00e9o d’un stimulateur cardiaque implant\u00e9 (B). Un r\u00e9cup\u00e9rateur d’\u00e9nergie \u00e0 double cantilever au sein d’un tube souple sur la sonde AICD du stimulateur cardiaque (C). (Source: Thayer School of Engineering \u00e0 Dartmouth College).<\/figcaption><\/figure>\n<\/div>\n

Pour construire le transducteur qui va g\u00e9n\u00e9rer du courant, les chercheurs ont utilis\u00e9 une combinaison de mat\u00e9riaux de conversion d\u2019\u00e9nergie \u00e0 couche mince et une approche m\u00e9canique peu invasive. Ils ont exploit\u00e9 l\u2019\u00e9nergie cin\u00e9tique d’un fil conducteur associ\u00e9 aux battements du c\u0153ur, puis l\u2019ont convertie en \u00e9lectricit\u00e9 pour charger en continu les batteries. Le mat\u00e9riau g\u00e9n\u00e9rateur de puissance est un film polym\u00e8re pi\u00e9zo\u00e9lectrique sp\u00e9cialis\u00e9 appel\u00e9 polyfluorure de vinylid\u00e8ne-trifluoro\u00e9thyl\u00e8ne (PVDF). -TrFE), con\u00e7u avec des structures poreuses et int\u00e9gr\u00e9 dans un cantilever flexible.<\/p>\n

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Fig. 2: Illustration du sch\u00e9ma du principe poreux, r\u00e9cup\u00e9rateur d’\u00e9nergie pi\u00e9zo\u00e9lectrique (A); flexible poreux Film mince de PVDF-TrFE (B); et image au microscope \u00e9lectronique \u00e0 balayage de la section transversale du film mince (C). (source: Thayer School of Engineering du Dartmouth College).<\/figcaption><\/figure>\n<\/div>\n

La sortie maximale \u00e9tait de 0,5 V et 43 nA  \u00e0 1 Hz, soit un peu plus de 20 nW. En ajoutant une petite masse d’\u00e9preuve de 31,6 mg sur la pointe de la pointe \u00e0 double cantilever, la puissance d\u00e9livr\u00e9e a \u00e9t\u00e9 augment\u00e9e d’un peu plus de 80%, cette masse suppl\u00e9mentaire ayant permis un rayon de courbure plus important qui a permis d’augmenter la puissance \u00e9lectrique du g\u00e9n\u00e9rateur.<\/p>\n

Articles en anglais en relation avec ce sujet<\/strong> :<\/p>\n

Snake-shaped energy harvester promises viable trickle charger<\/a><\/p>\n

Body motion drives implantable energy harvester<\/a><\/p>\n

Energy harvesting textile operates in the wet, is scalable<\/a><\/p>\n

Smart stitches monitor patient condition<\/a><\/p>\n

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 <\/p>\n","protected":false},"excerpt":{"rendered":"

Des chercheurs ont mis au point un prototype de transducteur de r\u00e9cup\u00e9ration d’\u00e9nergie destin\u00e9 aux implants m\u00e9dicaux, tels que les stimulateurs cardiaques (pacemakers), utilisant le mouvement naturel des vaisseaux sanguins li\u00e9s au c\u0153ur pour g\u00e9n\u00e9rer une puissance critique.<\/p>\n","protected":false},"author":11,"featured_media":87693,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[904],"domains":[47],"ppma_author":[1143],"class_list":["post-87692","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-medicalelectronics-fr","domains-electronique-eci"],"acf":[],"yoast_head":"Production d'\u00e9nergie pi\u00e9zo\u00e9lectrique pour les implants m\u00e9di...<\/title>\n<meta name=\"description\" content=\"Des chercheurs ont mis au point un prototype de transducteur de 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