Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1984-09-06
1986-08-05
Pellegrino, Stephen C.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
1283481, A61M 2500
Patent
active
046040943
ABSTRACT:
An everting catheter assembly includes a primary catheter tube inside which an everting or toposcopic element is secured spaced from the distal end of the primary catheter tube and with the open head end of the toposcopic element facing away from the open distal end of the primary catheter. The bonding of the toposcopic element to the interior of the primary catheter is effected with the use of a hollow mandrel through which the toposcopic element extends so that a short length of the toposcopic element projects out from the mandrel and is folded back over a length of the outer surface of the mandrel at the mandrel forward end. The mandrel is withdrawn into the primary catheter tube to the desired location for bonding at which point a bond is effected by means of heat conducted to the mating surfaces through the catheter wall or deposited locally by a radiative technique and heating between the mating surfaces. The tail end of the everting catheter is secured to a seal tube of greater rigidity by disposing the open tail end of the toposcopic element over a bias-cut end of the seal tube. Bonding is effected by application of heat to the mating surfaces. The bias-cut on the seal tube permits complete collapse of the toposcopic element upon pressurization of the annular cylindrical region from which the eversion is effected. Since the protruding bias-cut does not preferentially bend so as to evert within itself, a geometrically unbalanced collapse of the toposcopic element occurs. Introduction of pressurized sterile eversion fluid media into the annular region is facilitated by means of a bleed tube extending to the lead end of the annular region so as to permit pre-existing gas to be bled from the annular region during pressurization.
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Pellegrino Stephen C.
The United States of America as represented by the Secretary of
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