| 摘要 |
FASCILITATING ENDOSCOPY A method for inserting an instrument into the gastrointestinal tract of a mammal, by emplacing at least a portion of a flexible liner to form within the intestine an inner tube within an outer tube, the inner tube defining a lumen lying within the intestine and having a distal end accessible via the anal opening from outside the body of the mammal, and thereafter passing the instrument into the lumen via its distal end. Another aspect is the combination of an elongate evertible liner, a liner support chamber having a proximal port and a distal port, the liner having its two ends attached respectively at the ports, and a pressurizer for increasing the pressure within the chamber to cause the liner to be everted, the liner comprising a material characterized by having a wall thickness to diameter ratio and a zero strain elasticity modulus whose product is less than 4.0 lb/inch2, preferably less than 1.0 lb/inch2, and a wall thickness to diameter ratio and a 100% strain modulus of elasticity whose product is greater than 0.5 lb/inch2, preferably greater than 2.0 lb/inch2. In another aspect, at least a portion of the liner is gathered in the space between the ports, the liner defines a lumen between the ports, and a rigid guide tube lying within the lumen and between the ports provides an unobstructed passage for the instrument within at least a portion of the lumen. In another aspect, a tube extends distally from the distal port, the end of the liner attached to the distal port is everted over and gathered along the tube, and a pressurizer increases the pressure within the liner during eversion to aid the gathered portion of the liner to slide along and be released from the tube.
|
