A method and apparatus for embedding cells that utilizes a flow-through embedding technique maximizes the efficiency of extractions and decreases time for embedding the cell fragments, minimizes cell loss, and automatically positions cell samples at the position in which a microtome blade will section them. Application of an electric field to the liquid crystal layer changes the effective refractive index of the liquid crystal layer, making the device tunable. Thereby, dependent on the requirement, any desired potential can be applied to the counter-electrode andor the source can be operated with different magnet systems, in particular as arc or sputter source. A subcutaneous tunnel is created, and the first end of the tunnel is near the incision. Other embodiments are described and claimed. An implantable pump unit may be included for inflating and deflating the expandable members according to a desired sequence.