| 摘要 |
This invention is an improvement in an internal bolster for a corporeal access tube assembly wherein a retention balloon (20) is preformed of relatively thick silicone rubber film. The balloon includes a parallel front (56), and rear (57) sidewalls connected by a semi-circular treadwall (59), the front sidewall having a front retention surface thereon with a radial width equal to the radius of the treadwall. Annular sleeves (62, 63) at the inner periphery of each sidewall are sealed to the outer surface of a tube segment. Each sleeve extends forwardly of its corresponding sidewall.
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