CATHETER TUBING, CATHETER, AND CATHETER ASSEMBLY
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Accused Products
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. The wings can be folded against one another in order to serve as a gripping member (7) provided adjacent to the catheter when the catheter is being inserted into a fistula (40), whereupon they can be brought to contact and be releasably adhered to the skin of a patient.
59 Citations
62 Claims
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1-28. -28. (canceled)
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29. Catheter tubing consisting essentially of:
a composite tubing defining a duct therein, the composite tubing comprising a first polymeric material which consists essentially of a hydrophilic plastic material which absorbs moisture and therefore swells such that its volume increases significantly in contact with blood, and a second material which essentially does not absorb moisture and therefore will not swell in a moist environment, but which forms reinforcing, longitudinal strands in the tubing, which counteract that the tubing is elongated or that its thickness is increased due to the swelling capacity of the first polymeric material, wherein the first polymeric material forms longitudinal strands in the tubing, and that the strands of said first and second materials, in a cross section of the tubing, form edge to edge connected segments, such that the increase of the volume of the hydrophilic first plastic material substantially results in an increase of the circumference of the tubing and hence of the tubing diameter and duct cross section area. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. Catheter assembly comprising a catheter, a proximate conduit, and a hub forming a connection between the catheter and the proximate conduit for conveying blood or dialysis liquid to or from a fistula or other vessel of a patient, said hub comprising a rear portion through which there extends a straight passageway which is coaxial with an end portion of the catheter which is connected to the hub, and a branch conduit to which said proximate conduit is or can be connected;
- and a distal portion in front of the mouth of said branch conduit, wherein
the catheter consists essentially of a piece of a tubing comprising at least substantially of plastic material, a rear section of the catheter extends at least a short way into and is connected to said distal portion of the hub, that a cannula in the form of a tubular metal needle extends through said straight passageway and through the catheter, such that the sharpened end of the cannula projects a short distance in front of the front end of the catheter, wherein the cannula can be withdrawn rearwise out of the hub, so that a connection is established between the catheter and the branch conduit, and that said distal portion of the hub is provided with a pair of wings extending from the hub, which wings can be folded against one another to serve as a gripping member when the catheter shall be inserted into the fistula and thereafter be brought to contact and to be attached releaseably to the skin of the patient in order to fix the catheter. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
- and a distal portion in front of the mouth of said branch conduit, wherein
Specification