A hip distractor includes a pair of distractor members and a support configured to be fastened to a surgical table. The transistor is formed into a well arrangement in which a shallow, heavily doped, well is disposed at least partially within a deeper, more lightly-doped well, both formed into an epitaxial layer of the substrate. At an information processor, instructionobject information is acquired from the memory and processed to provide a control corresponding to the content of the instructionobject information.