The present invention is a prosthetic for replacement of at least a part of the 
nucleus of a intravertebral disc. The prosthetic device is composed of at least two essentially parallel soft 
layers of an elastically deformable hydrogel and at least one rigid layer, the rigid layer having less 
compressibility than the soft 
layers, being adjacent to the soft 
layers, parallel to them, and firmly attached to them. In some embodiments, the soft layers have the same thickness and composition. Typically, the 
prosthesis has more than one rigid layer and these rigid layers have the same thickness and composition. The number of soft layers is usually one more than the number of rigid layers, with, e.g., at least three soft layers. The invention also includes a method of 
prosthesis production, which involves prefabricating soft and rigid layers; stacking at least two prefabricated soft and at least one prefabricated rigid layer in a parallel fashion into their final form, and, permitting the layers to firmly connect to one another by mutual interaction. In this method, at least one type of the layers is prefabricated in the dehydrated state, which is done by dehydrating stretched foil in an apparatus preventing its contraction and thereby decreasing its area. There is at least partial 
dehydration of the 
prosthesis under pressure applied in a direction tangent to the planes of the layers. In preferred embodiments, while in the state of almost full 
dehydration, is sterilized using 
ionizing radiation or a gaseous 
chemical agent, after which it is partially rehydrated within the sterile wrapper using 
water vapor.