| 摘要 |
A flexible retention catheter includes a soft, pliable cone-shaped tip with a reduced urethral contact surface defined by spiral grooves or hair-like projections. A magneto-insert embedded within the tip is used in cooperation with an electromagnet externally of the catheter to propel the catheter along the urethra by repulsive or attractive lines of magnetic force. In one embodiment, the tip of the catheter is partially divided along one transverse line to form a hinged tip segment and in another embodiment, the tip portion is divided longitudinally along a line intersecting with a transverse dividing line forming two hinged tip segments. The segments are releasably joined by releasable fasteners. The hinged tip segments are swung about the hinge connection against the inflated surface of the balloon by tension strips that extend along the balloon and move in response to a distention thereof to expose the drainage lumen within the tip. Other string actuators also traverse the balloon and elastically spread diametrically-divided end segments of a portion of the lumen to retain a segment of the catheter in situ in the urethra while the remaining portion of the lumen disjoined therefrom is withdrawn from the urethra. The implanted portion of the catheter is adjoined with an inflation lumen that extends along the length of the urethra. A collapsible sheath is adhered to the implanted segment in a fluid-conducting relation with the drainage lumen thereof.
|
