DIALYSIS CATHETER, IN PARTICULAR FOR LONG-TERM USE

Abstract

The invention relates to a catheter for dialysis, in particular for long-term use, having a proximal end for insertion into a blood vessel, having a middle wall extending along a longitudinal axis and forming a midplane, wherein the middle wall separates an introduction lumen from a removal lumen, wherein the removal lumen has at the proximal end a removal opening for the removal of blood, and the introduction lumen has at the proximal end an introduction opening for the introduction of purified blood, wherein the removal opening is located in a plane which intersects the midplane in a section line at an acute angle w.sub.1, wherein the section line and the longitudinal axis enclose an acute angle , and in that the introduction opening is located in a plane which intersects the midplane in a section line s.sub.2 at an acute angle, wherein the section line and the section line enclose an angle which lies in the range from 60 to 120.

Claims

1. Catheter (10) for dialysis, in particular for long-term use, having a proximal end (12) for insertion into a blood vessel, having a middle wall (14) extending along a longitudinal axis l and forming a midplane E.sub.w, wherein the middle wall (14) separates an introduction lumen (18) from a removal lumen (20), and wherein the removal lumen (20) has at the proximal end (12) a removal opening (22) for the removal of blood, and the introduction lumen (18) has at the proximal end (12) an introduction opening (24) for the introduction of purified blood, characterized in that the removal opening (22) is located in a plane E.sub.1 which intersects the midplane E.sub.w in a section line s.sub.1 at an acute angle w.sub.1, wherein the section line s.sub.1 and the longitudinal axis l enclose an acute angle , and that the introduction opening (24) is located in a plane E.sub.2 which intersects the midplane E.sub.w in a section line s.sub.2 at an acute angle w.sub.2, wherein the section line s.sub.1 and the section line s.sub.2 enclose an angle which lies in the range from 60 to 120.

2. Catheter (10) according to claim 1, characterized in that the angle lies in the range from 80 to 100, and further lies in the range of 90.

3. Catheter (10) according to claim 1, characterized in that the acute angle lies in the range from 30 to 60, and further in the range of 45.

4. Catheter (10) according to claim 1, characterized in that angles w.sub.1 and w.sub.2 are of the same size and/or lie in the range from 30 to 60, and further in the range of 45.

5. Catheter (10) according to claim 1, characterized in that the intersection point S of the section line s.sub.1 and the section line s.sub.2 lies outside the middle wall (14).

6. Catheter (10) according to claim 1, characterized in that the proximal end (12) has a free end edge (26) which is located in an end line, wherein the end line runs parallel to the section line s.sub.2 or encloses an angle with the section line s.sub.2 which lies in the range from 0 to 15.

7. Catheter (10) according to claim 6, characterized in that the free end edge (26) is formed by the middle wall (14).

8. Catheter (10) according to claim 6, characterized in that the middle wall (14) has two edges (28, 30) running parallel to the longitudinal axis l, wherein the free end edge (26) encloses an acute angle w.sub.4 with one edge (28) and an obtuse angle w.sub.5 with another edge (30).

9. Catheter (10) according to claim 8, characterized in that the acute angle w.sub.4 lies in the range from 30 to 60 and further preferably in the range of 45.

10. Catheter (10) according to claim 1, characterized in that the introduction lumen (18) has at least one additional opening arranged at a distance from the introduction opening (24).

11. Catheter (10) according to claim 1, characterized in that the removal lumen (20) has at least one additional opening (32) arranged at a distance from the removal opening (22).

12. Catheter (10) according to claim 1, characterized in that the introduction lumen (20) has a cross-section that corresponds to a corresponding cross-section of the removal lumen (20).

13. Catheter (10) according to claim 2, characterized in that the acute angle lies in the range from 30 to 60, and further in the range of 45.

14. Catheter (10) according to claim 2, characterized in that angles w.sub.1 and w.sub.2 are of the same size and/or lie in the range from 30 to 60, and further in the range of 45.

15. Catheter (10) according to claim 3, characterized in that angles w.sub.1 and w.sub.2 are of the same size and/or lie in the range from 30 to 60, and further in the range of 45.

16. Catheter (10) according to claim 2, characterized in that the intersection point S of the section line s.sub.1 and the section line s.sub.2 lies outside the middle wall (14).

17. Catheter (10) according to claim 3, characterized in that the intersection point S of the section line s.sub.1 and the section line s.sub.2 lies outside the middle wall (14).

18. Catheter (10) according to claim 4, characterized in that the intersection point S of the section line s.sub.1 and the section line s.sub.2 lies outside the middle wall (14).

19. Catheter (10) according to claim 2, characterized in that the proximal end (12) has a free end edge (26) which is located in an end line, wherein the end line runs parallel to the section line s.sub.1 or encloses an angle with the section line s.sub.1, which lies in the range from 0 to 15.

20. Catheter (10) according to claim 3, characterized in that the proximal end (12) has a free end edge (26) which is located in an end line, wherein the end line runs parallel to the section line s.sub.1 or encloses an angle with the section line s.sub.1, which lies in the range from 0 to 15.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0019] In the drawings:

[0020] FIG. 1 shows the side view of the proximal end of the catheter with the removal opening;

[0021] FIG. 2 shows the view according to FIG. 1 rotated by 180 about the longitudinal axis l;

[0022] FIG. 3 shows a cross-section of the catheter according to FIG. 1 along the line III;

[0023] FIG. 4 shows the bottom view of the proximal end of the catheter according to FIG. 1;

[0024] FIG. 5 shows the top view of the proximal end of the catheter according to FIG. 1; and

[0025] FIG. 6 shows a perspective view of the proximal end of the catheter with the removal opening.

DETAILED DESCRIPTION OF THE BEST MODE OF THE INVENTION

[0026] The drawings show a dialysis catheter 10 having a proximal end 12 for insertion into a blood vessel. The catheter 10 has a middle wall 14 extending along a longitudinal axis l and forming a midplane E.sub.w.

[0027] As can be seen in FIG. 3, the cross-section of the catheter has a round contour with an outer wall 16. The middle wall 16 separates the inside of the catheter into an introduction lumen 18 and a removal lumen 20. At the proximal end 12, the removal lumen 20 has a removal opening 22. In this case, the removal opening 22 is located in a plane E.sub.1 indicated in FIG. 1.

[0028] At the proximal end 12, the introduction lumen 20 has an introduction opening 24. As is apparent from FIG. 2, the introduction opening 24 is located in a plane E.sub.2.

[0029] As shown in FIG. 1, the plane E.sub.1 encloses an acute angle w.sub.1 with the midplane E.sub.w. In this case, the angle w.sub.1 is approximately 45. As is also apparent from FIG. 1, the removal opening 22 is arranged at a distance from the free end of the catheter which is formed by a free end edge 26 of the middle wall 14. The distance a, measured along the longitudinal axis l, essentially corresponds to the diameter d of the outer wall 16.

[0030] As is apparent from FIG. 2, the midplane E.sub.w and the plane E.sub.2 enclose the angle w.sub.2, wherein the angle w.sub.2 lies in the range of 45. As is also apparent from FIG. 2, the end edge 26 is located in the section line s.sub.2 of the plane E.sub.w in the plane E.sub.2. The section line s.sub.2 intersects the longitudinal axis l at the angle . The angle is preferably 45.

[0031] As is apparent from FIG. 1, the plane E.sub.1 intersects the plane E.sub.w in the section line s.sub.1. The section line s.sub.1 intersects the longitudinal axis l at the angle . The angle is preferably 45. As is also apparent from FIG. 1, the section line s.sub.1 intersects the section line S.sub.2, which runs along the end edge 26, at an angle . The angle preferably lies in the range from 80 to 90.

[0032] It is also apparent from FIG. 1 that the intersection point S of the section line s.sub.1 with the section line s.sub.2 lies outside the middle wall 14.

[0033] It is also apparent from FIG. 1 that, in the region of the proximal end 14, on the side proximal to the removal opening 22, the middle wall 14 has two edges 28, 30 running parallel to the longitudinal axis. The edge 28 encloses an acute angle w.sub.4 of 45 with the end edge 26 or the section line s.sub.2. The other edge 30 encloses an obtuse angle w.sub.5 in the range of 135 with the end edge 26 or the section line s.sub.1.

[0034] As is particularly apparent from FIGS. 1 and 2, the introduction lumen 20 has an additional opening 32 spaced apart from the removal opening 22. This additional opening 32 serves to ensure that blood can also be removed in case the introduction opening 22 is closed, for example, by bearing against a blood vessel. Correspondingly, as is apparent from FIG. 2, an additional opening 34 is provided on the introduction lumen 18.

[0035] The described geometric configuration of the proximal end 12 of the catheter 10 has the advantage that, during the operation of the catheter 10, blood can be optimally removed and purified blood can be optimally introduced into a blood vessel.