Abstract: A device including a support (4) comprising a support base defining a spherical base contact surface, extending along a virtual sphere (S) and a circular rim extending in a rim plane; a first and a second needle mobile on the support between extracted and inserted positions in which the first and second needles are outside and maximally inserted in said virtual sphere, respectively, via first and second intermediate piercing positions in which, respectively, the first and second needles extend along first and second insertion axis and their tips are located on first and second insertion points belonging respectively to first and second hemispheres of the virtual sphere separated by a “median radial plane of the rim”, an angle (?) between the median radial plane and any insertion axis being between 70° and 110°.