Apparatus for real time evaluation of tissue ablation

A - Human Necessities – 61 – B

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A61B 18/22 (2006.01)

Patent

CA 2588402

An apparatus and method for the evaluation of tissue ablation is provided. The apparatus comprises a broadband (white; multiple wavelengths) light and/or laser light (single wavelength) illumination source that delivers light to the site where a lesion is being formed. Scattered light is collected from the ablated tissue and evaluated to obtain qualitative information regarding the newly formed lesion. The apparatus allows assessment of such parameters as, for example, catheter- tissue proximity, lesion formation, depth of penetration of the lesion, cross-sectional area of the lesion in the tissue, formation of char during the ablation, recognition of char from non-charred tissue, formation of coagulum around the ablation site, differentiation of coagulated from non-coagulated blood, differentiation of ablated from healthy tissue, and recognition of steam formation in the tissue for prevention of steam pop. These assessments are accomplished by measuring the intensity and spectrum of diffusely reflected light at one or more wavelengths.

L~invention concerne un appareil et un procédé d~évaluation de l~ablation de tissus. L~appareil comprend une source d~illumination à lumière à large bande (blanche ; longueurs d~ondes multiples) et/ou à lumière laser (longueur d~onde unique) qui apporte de la lumière sur le site où on forme une lésion. La lumière diffusée est collectée au niveau du tissu découpé et évaluée pour obtenir des informations qualitatives concernant la lésion nouvellement formée. L~appareil permet d~évaluer des paramètres tels que, par exemple, la proximité entre le cathéter et le tissu, la formation de la lésion, la profondeur de pénétration de la lésion, la superficie en coupe de la lésion dans le tissu, la formation de carbonisation pendant l~ablation, la reconnaissance du tissu carbonisé par rapport au tissu non carbonisé, la formation de caillots autour du site d~ablation, la différenciation du sang coagulé et du sang non coagulé, la différenciation du tissu découpé et du tissu sain et la détection de la formation de vapeur dans le tissu pour empêcher un éclatement dû à la vapeur. Ces évaluations sont accomplies en mesurant l~intensité et le spectre de la lumière réfléchie de manière diffuse suivant une ou plusieurs longueur(s) d~onde.

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