| 摘要 |
A self retaining hollow tube for access into a body cavity which has a folding strut based retention system deployed through the use of two coaxially arranged tubes 14, 15. Preferably outer tube 15 includes one or more struts which may be made of a stiffer plastic material than the tube or may incorporate a stiffening material. The struts may have hinged joints 16, 17, 18 created by an area of weakened or more flexible material. The sections 19, 20 of the struts between the hinged joints 16, 17, 18 may be of equal or unequal length. The outer tube 15 may be split and cut to length after insertion and may include an integrally moulded external plate with a locking mechanism to secure the tube to the exterior body surface. The struts may be covered in a membrane. The inner tube may include a mechanism to deploy the struts. |
