Abstract: The invention relates to a medical examination and treatment device for producing and/or visualising and/or treating ablation lesions on tissue or vessel surfaces, in particular in the heart, comprising at least one catheter tube, which forms an elongate inner cavity within which at least one HF ablation wire is guided, wherein the catheter tube and/or the HF ablation wire is controllable in an open and/or closed-loop manner by an open and/or closed-loop control device such that heat and/or cold can act on the tissue or vessel surfaces in a targeted manner along the tissue or vessel surfaces by means of the HF ablation wire, in particular in order to obliterate said surfaces at least in part, at least one measurement and/or recording system designed and provided to measure electrical impulses of the tissue or vessel surfaces such that electrical impulses can additionally be measured at various sites on the tissue or vessel surfaces, in particular during treatment, more particularly simultaneously, wherein at

Abstract: A method for visualizing the quality of an ablation process with a processing and display unit is provided. A 3D dataset of an anatomical object and a 3D image model of an ablation instrument are provided, wherein the 3D image model models at least the surface of the ablation instrument. A position and an alignment of the 3D image model of the ablation instrument within the anatomical object is specified, wherein the 3D image model of the ablation instrument is incorporated into the 3D dataset of the anatomical object. At least a part of the incorporated 3D image model of the ablation instrument and of the 3D dataset of the anatomical object is presented and at least one characteristic quality value is determined as a function of the location of the 3D image model of the ablation instrument in relation to the anatomical object.