A catheter including a flexible hose attached to one end of a rigid tube through which fluid pressure may be applied to invert said hose from an invaginated position within said tube to an exserted position extending outwardly of said tube has formed at the distal of said hose a valve which remains closed when the hose is in the invaginated position and which opens with the hose in its exserted position. The valve is formed integrally by portion of the hose distal end by cutting the distal end along a plane extending obliquely of the axis of the hose and forming the distal end walls of the hose in an abutting configuration defining therebetween an orifice which tends to remain closed by abutment of the distal end walls against each other when the hose is in its invaginated position, and particularly when fluid pressure is applied within the tube, with the abutting wall portions between which said orifice is defined tending to separate to open the orifice when the hose is exserted from the tube.
Urinary evagination catheters comprising a rigid tube and a flexible invaginated hose are provided with a novel stopper arrangement in the ported distal end of the hose that remains closed until the hose is fully everted from the tube at which point it automatically opens to permit fluid flow through the catheter. This eliminates the need for a push rod or the like to evert the hose and permits it to be everted simply by fluid pressure applied to the proximal end of the catheter. Methods for producing the new catheters are described.
A catheter of the evagination type is provided with an inverted-evertable non-elastic tube having a diameter throughout equal to or greater than the catheter body, an axially aligned end opening at the distal end, and a multifold configuration of the distal end to maintain end-sealing during inversion and eversion.
A sterile envelope-dispensing catheter introducer. A tubular introducer, through which a catheter is passed, dispenses a membranous shroud, or envelope, from within and out a distal opening thereof. The shroud is withdrawn by manipulation or by the urging of a body organ pressing against a shroud entrainment device. Interposition of the convolutionally rearward transported shroud over (and between) the introducer's distal portion (and the body internal organ surfaces) assures a sterile catheter passage through the introducer and into the organ.
A catheter to be passed through the nasopharynx and into the trachea without contamination of the catheter lumen for obtaining uncontaminated sputum specimens. The catheter lumen is sealed to prevent entry of contaminants by the provision of a length of flexible, expandable tubing placed over and attached to the distal end of the catheter. The flexible tubing is rolled-up over a portion of its length and inverted into the unrolled portion, with the unrolled portion forming a cuff encircling the rolled-up portion to hold the rolled portion. A syringe pump connected to the opposite end of the catheter introduces fluid under pressure into the lumen of the catheter to expand the cuff and urge the rolled-up portion of the tubing from the cuff, and to unroll the tubing, whereby the lumen of the catheter is unsealed. An inner catheter is inserted into the lumen of the outer catheter and advanced therethrough and out the end beyond the tubing for performing aspiration.
Tube to be introduced in a pipelike cavity, and where the forward end of the tube is secured to the entrance to this cavity, and the following part of the tube is introduced through this forward end by a turning inside out, and where the tube to facilitate this operation in its internal layer, which after the introducing turns outside, has build-in compression stresses and/or in its outer layer, which after introducing turns inward, has build-in tension stresses.
