| 摘要 |
A dilator (10) formed with a truss (16) with a pair of spaced-apart end surfaces (20, 22, 46) that provides a restoring force therebetween if forced toward one another, this restoring force provided by a resilient band (30a, 30b) extending between the opposite ends of the truss (16) with a plurality of notches (43a, 43b, 43c) located at each of the ends thereof. The notches (43a, 43b, 43c) exceed at least a third of the thickness of the band (30a, 30b) and may comprise a separation (82, 82', 82', 82"', 82"") at the location thereof between selected portions of the resilient band (30a, 30b) with this separation (82, 82', 82', 82"', 82"") surrounded by a corresponding separation edge thereabout intersecting a first surface of the first resilient band. A second and similar band may also be provided in the truss (16).
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