In another embodiment, the loop structure is defined by a geometrical shape that includes an open curve, defining an open loop structure, wherein a point moving along the open curve forms a path from a starting point to a final point that is proximal to but separated from the starting point by a distance. The distance is typically a function of a thickness of the body tissue and/or skin to which the loop structure is attached, i.e. the distance is configured such that the loop structure is attachable to the user's body. The distance is selected from a group consisting of a length that is smaller than the thickness of the body tissue, a length that is more than the thickness of the body tissue but is adapted to be reduced such that the changed length is smaller than the thickness of the body tissue, and a length that is less (may even be close to zero) than the thickness of the body tissue but is adapted to be increased such that the changed length is slightly smaller than the thickness of the body tissue. In these alternatives, it is apparent that the length smaller or slightly smaller than the thickness of the body tissue is adapted in a way such that a compressive retention force between a first end (i.e. first point of the geometrical shape) and a second end (i.e. second point of the geometrical shape) against the body tissue is applied. The skilled person would appreciate that the distance may be changed in order to achieve a balance between reliable retention and user comfort, especially for extended wearing of the medical device.
In different embodiments, the loop structure may include shape that is selected from a circular, elliptical, rectangular, square, polygonal shape, curved shape or a combination thereof.