Abstract: The present invention relates to a valve assembly for sealing a through passage of a catheter introducing device, comprising a sealing unit having a movable closing member connected to a biasing means, and a seat member arranged with a sealing surface around the aperture of the through passage, wherein the biasing means is arranged to urge the closing member to sealably abut against the sealing surface, corresponding to a closed position, so as to prevent flow of fluid through the valve. The invention also relates to a catheter introducer assembly comprising a valve assembly.

Abstract: A catheter tubing (2) consists of a composite comprising a first material (54) which mainly consists of a hydrophilic plastic material which absorbs moisture and which therefore swells in contact with e.g. blood, and a second material which essentially does not absorb moist but which forms reinforcing longitudinal strands (55) in the catheter tubing, which counteract that the catheter tubing is extended or becomes thicker because of the swelling capacity of the first polymeric material, such that the volume increase of the hydrophilic, first plastic material substantially results in an increase of the circumference of the tubing and hence of its diameter and flow area. A catheter is made of a catheter tubing of that type and can be included in an assembly (1) comprising a hub (4) having a front portion (11) provided with a pair of wings (29) extending outwards from the hub.