Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-07-23
1995-11-07
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 43, A61M 2500, A61M 300
Patent
active
054643988
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a multi-lumen catheter and more particularly, to a multi-lumen catheter having a deformable separating wall between adjacent lumina.
A double-lumen catheter, which consists of a tube which is rigid in its cross-section, in which an additional thinner tube, with a rigid cross-section, proceeds in a "side by side" manner, which tube is firmly connected with the internal wall of the outer tube, is already known from the publication "Medcomp" of the firm Medical Components, Inc., of 14999 Delp Drive, Harleysville, Pa. 19438, U.S.A., page 4. One lumen is formed between the inner and the outer tube, while the second lumen is formed within the inner tube. An additional double-lumen catheter, which is constructed on the basis of the same principle as the first-described catheter, but in which the inner tube proceeds loosely and coaxially in the outer tube, however, is also depicted and described on page 6 of the said "Medcomp" publication.
Catheters of the type under discussion, which consist of a tube which is flexible over its length, but is, however, essentially rigid in its cross-section, and which proceed in three independent lumina, are already known from the publication WO 8810128-A, as well as through the publication "CERTOFIX DUO/TRIO" of the firm B. Braun, of Melsungen AG in D-3508, Melsungen.
There is a strong need, within the field of medicine, for multi-lumen catheters in order to be able to introduce incompatible medications through a single catheter separately from one another, and also, furthermore, in order to make a parallel infusion possible, both by means of gravity, as well as by means of a pump. All of the catheters described above have a relatively large diameter, since their total cross-section essentially corresponds to the sum of the individual cross-sections of the individual lumina. Because of the greater cross-section as well as the cross-pieces separating the individual lumina from one another within the interior of the catheter, a greater rigidity also arises, because of the increased resistance moment. There additionally exists the disadvantage that the stiffening which is brought about from the cross-pieces between the lumina negatively influences the bending behavior of the catheter, at least in a number of directions of bending. For this reason, the wall thicknesses of such multi-lumen catheters must be greater than is the case with single-lumen catheters. In addition, the flow resistance is increased in the lumina, since the wall surface is increased relative to a round, single-lumen catheter. This applies, in particular, for the known catheters which have been described above, in which the lumen, which is formed between the inner and the outer tube, has a disproportionately large circumferential surface. Flow resistance is, as is known, essentially determined by the size of the circumferential surface.
One additional disadvantage of the multi-lumen catheter described above consists of the fact that, as statistics show, the risk to patients is increased with their use. The large diameter, which makes a relatively larger puncture necessary, and which, within a vessel, constricts the cross-section of the same, is, above all, responsible for this. In addition, because of the increased bending stiffness, bending forces are conveyed to the puncture opening and to the vessel to a greater extent.
The task which forms the basis of the invention is that of creating a catheter of the type under discussion which has at least two lumina, the cross-sections of which are reduced in relation to the known types of multi-lumen catheters, and the bending resistance of which is reduced, and in which, furthermore, the risk for the patients is reduced.
The task which forms the basis of the invention is solved by means a multi-lumen catheter incorporating a separating wall between lumina that is deformable.
The invention is based on the basic idea that the individual lumina of a multi-lumen catheter are not, or must not, be simultaneously used wit
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Publication B. Braun-Certofix Duo/Trio (2 pages).
Publication Medical Components Inc. (Cover sheet, pp. 4 and 6).
Rosenbaum C. Fred
Wilkens III Frank
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