The present disclosure relates to a dialysis device (1), more particularly a microdialysis device for the sampling of substances from the surface of a body organ. The device is particularly useful in the context of the monitoring of a moving organ, such as a beating heart, as the device comprises attachment means (2) allowing for a flexible and reliable attachment thereto. Furthermore, the microdialysis device provides for an efficient exchange of substances, such as metabolic substances, between the organ and the dialysis fluid through a semi-permeable material forming part of the device. There is also provided a method encompassing the device of the disclosure.
