| 摘要 |
A medical device for intrusion of body cavities and canals, such as the gastrointestinal, urinal, vaginal and vascular tracts, is provided with unconventional surface structure, namely one having a bidirectional coefficient of friction upon ingress and egress into a body cavity, such surface replacing conventional slippery low friction surfaces. Thus at least the surface zones (17, 19) of device surfaces (15, 20) tending to contact human tissue in ingress and egress are provided with a surface having a bidirectional coefficient of friction with the human tissue in the tracts being treated, which surface has the characteristic of favoring ingress movement into the work site and impeding egress movement out of the work site. The device can include instruments with the specially textures surfaces such as viewing, therapeutic, surgical and biopsy instruments, catheters (20), guide cables (15), encompassing tubulation, and the like. This improved device expedites push endoscopy procedures for example giving the surgeon a better feel for finding appropriate canal pathways and work sites. The textured surface also provides the advantage of feeding devices and instruments into a work site by inching the distal end back and forth to pleat the canal walls behind the distal end and open up a substantially straight increment for the distal end to travel substantially parallel with the canal walls.
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