A surgical device for application in a treatment performed on the human or animal body with the aim of providing access to a surgical site in the body by exerting a force, upon expansion of the device at the location of the surgical site, on the organs and/or tissues at the surgical site, e.g. for mobilizing and/or supporting organs and/or tissues, the surgical device including an expansion structure, at least one fluid reservoir, and a conduit for conveying fluid from the reservoir to the expansion structure.