Dilator with peel force reducing structure

A dilator capable of introducing separating stresses in anatomical outer wall tissues, said dilator comprising:

• a truss having a pair of spaced-apart end surfaces terminated by end edges at opposite ends of said truss and having means for generating restoring forces including at least a first resilient band of selected thickness in said truss extending between said end edges such that, if said spaced-apart end surfaces are forced toward one another from initial positions to thereby substantially reduce direct spacing therebetween by a spacing reduction force external to said truss, restoring forces result in said truss which tend to restore said direct spacing between said end surfaces with such restoring forces being due to at least said first resilient band, and further having means for reducing said restoring forces at a selected location in said first resilient band comprising a separation at said selected location between selected portions of said first resilient band with said separation surrounded by a corresponding separation edge thereabout intersecting at least a first surface of said first resilient band;
• and
• engagement means adhered to said end surfaces adapted for engaging exposed surfaces of outer wall tissues and for remaining so engaged against said restoring forces.