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