| 摘要 |
A dilator (10) formed with a truss (16) with a pair of spaced-apart end surfaces (20, 22) that provides a restoring force therebetween if forced toward one another, this restoring force provided by a resilient band (30a) extending between the opposite ends (70a, 706) of the truss (16) with a plurality of notches (43a, 43b, 43c) at each end thereof. The notches (43a, 43b, 43c) exceed at least a third of the thickness of the band (30a). A second and similar band (30a) may also be provided in the truss (16).
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