Catheter

Claim 2

Catheter with two lumens for puncturing blood vessels, particularly in hemodialysis, comprising: two separate channels, one of each channels for supplying blood to, and the other for returning blood from, external circulation; said channels running side by side through a section with a point that can be inserted through a puncture into the blood stream and being axially separated at the other end; a longitudinal guide; each channel comprising an individual catheter slidable back and forth against the other channel inside said longitudinal guide; each channel being positionable at a predetermined location relative to the other channel dependent upon predetermined conditions.

Claim 3

Double catheter according to claim 1, wherein said longitudinal guide comprises a cuff surrounding and connected to one catheter in which the other catheter is longitudinally slidably received.

Claim 4

Double catheter according to claim 2, wherein said longitudinal guide with one catheter is of one-piece construction.

Claim 5

Double catheter according to claim 2 or 3, including a seal at said cuff end remote from the catheter tips for preventing blood from flowing along the catheter guide in said cuff.

Claim 6

Double catheter according to claim 4, wherein said seal comprises a cap of latex material surrounding said cuff with a respective passage opening for each individual catheter.

Claim 7

Double catheter according to claim 1, wherein one catheter has a conically tapering tip and perforations in the region of said tip.

Claim 8

Double catheter according to claim 1, wherein one catheter has a tip with an inclination and lateral openings.

Claim 9

Double catheter according to claim 1, wherein at least one of the individual catheters has a scale and the other individual catheter has a marking for controlling the relative position of the two catheters.

Claim 10

Double catheter according to claim 1, wherein the individual catheters have regions of extra-corporeal ends with parts of latex, cross-sections in the region of said parts being squeezably closable by clamps.

Claim 11

Double catheter according to claim 1, wherein the individual catheters have extra-corporeal ends which are closable by strippable caps of latex.

Claim 12

Double catheter according to claim 10, said caps have bottoms with a wall thickness reduction for perforating insertion of a guidance spiral.

Claim 13

Double catheter according to claim 1, wherein a guidance spiral is introduced over a predetermined length into a punctured vein, one individual catheter being introduced via said guidance spiral into said vein, the other individual catheter being pushed with said longitudinal guide over said one individual catheter until a predetermined insertion depth is obtained, the vein puncture location being enlarged according to the thickness of said longitudinal guide, said guidance spiral serving for insertion of said one catheter being thereafter withdrawn, said one catheter being further insertable into said vein dependent on predetermined conditions.

Claim 14

Double catheter according to claim 12, wherein said longitudinal guide comprises a cuff surrounding and connected to one catheter in which the other catheter is longitudinally slidably received; said longitudinal guide with one catheter being of one-piece construction; a seal at said cuff end remote from the catheter tips for preventing blood from flowing along the catheter guide in said cuff; said seal comprising a cap of latex material surrounding said cuff with a respective passage opening for each individual catheter; one catheter having a conically tapering tip and perforations in the region of said tip; said one catheter having a tip with an inclination and lateral openings; at least one of the individual catheters having a scale and the other individual catheter having a marking for controlling the relative position of the two catheters; the individual catheters having regions of extra-corporeal ends with parts of latex, cross sections in the region of said parts being squeezably closable by clamping means.