Catheter arrangement

• US 20040116832A1
• Filed: 06/19/2003
• Published: 06/17/2004
• Est. Priority Date: 06/21/2002
• Status: Abandoned Application

• Current Assignee: Curative Medical Devices GmbH (ResMed Incorporated)
• Original Assignee: Curative Medical Devices GmbH (ResMed Incorporated)
• Inventors: Friedrich, Holger, Erbel, Raimund
• Application Number:
  US10/464,843
• Publication Number:
  US 20040116832A1
• Time in Patent Office: Days
• US Class Current: 600/585
• CPC Class Codes: A61M 2025/0175 having telescopic features, interengaging nestable members movable in relations to one another
• CPC Class Codes: A61M 25/0152 with pre-shaped mechanisms, e.g. pre-shaped stylets or pre-shaped outer tubes
• CPC Class Codes: A61M 25/09041 Mechanisms for insertion of guide wires

Abstract

The invention relates to a catheter arrangement for invasive medical treatment for introducing and controlling a guide wire in a vessel branch or vessel entry by bending the guide wire. The catheter arrangement comprises two catheters, each having a distal end and a proximal end and a lumen, wherein the two catheters are embodied as an inner catheter 3 and an outer catheter 2 extending coaxially within one another and arranged so as to be moveable relative to one another in an axial direction, wherein the inner catheter 3 has a pre-bent distal tip 3a of a bendable material and the outer catheter 2 has a continuous lumen 22 extending from the proximal end 20 to the distal end 21 for receiving the inner catheter 3, wherein both catheters 2, 3, at a spacing from the distal end 21, have lateral openings 23, 33 for passing the guide wire F therethrough.

Claims

1. A catheter arrangement for invasive medical treatment for introducing and controlling a guide wire (F) in a vessel branch or vessel entry by bending the guide wire, comprised of two catheters, each having a distal end and a proximal end and a lumen, wherein the two catheters are embodied as an inner catheter (3) and an outer catheter (2) extending coaxially within one another and arranged so as to be moveable relative to one another in an axial direction, wherein the inner catheter (3) has a pre-bent distal tip (3a) of a bendable material and the outer catheter (2) has a continuous lumen (22) extending from the proximal end (20) to the distal end (21) for receiving the inner catheter (3), wherein both catheters (2, 3), at a spacing from the distal end (21), have lateral openings (23, 33) for passing the guide wire (F) therethrough.

2. The catheter arrangement according to claim 1, characterized in that the passage (33) of the inner catheter (3) and the lateral opening (23) of the outer catheter (2) are arranged such in the catheters (2, 3) that in the position with retracted or extended distal tip (3a) the openings (23, 33) are at least partially overlapping one another.

3. The catheter arrangement according to claim 1 or 2, characterized in that, when retracting the inner catheter (3) into the outer catheter (2), the pre-bent distal tip (3a) of the inner catheter (3) can be stretched and, when extending the distal tip (3a) from the distal end (21) of the outer catheter (2), the distal tip returns into the preset pre-bent shape.

4. The catheter arrangement according to one of the claims 1 through 3, characterized in that the inner catheter (3) in the distal area is provided with a lumen (32) beginning at the distal end (31) having an exit opening (32a), wherein the lumen (32) extends in the direction toward the proximal end (30) up to at least a passage (33) formed in the circumference of the inner catheter (3).

5. The catheter arrangement according to one of the claims 1 through 4, characterized in that the distal tip (3a) of the inner catheter (2) is pre-bent at an angle (α

) of approximately 60°

to 120°

relative to the longitudinal axis (X) of the catheter shaft.

6. The catheter arrangement according to one of the claims 1 through 5, characterized in that the length (L1) of the lateral opening (23) of the outer catheter (2) is at least as long as the length (A1) of the bent distal catheter tip (3a) of the inner catheter (3).

7. The catheter arrangement according to one of the claims 1 through 6, characterized in that the spacing (A4) of the lateral opening (23) in the outer catheter (2) from the distal ends (21) is greater or the same as the length (L1) of the lateral opening (23).

8. The catheter arrangement according to one of the claims 1 through 7, characterized in that the lateral opening (23) of the outer catheter (2) is configured in the form of a slotted hole or oval and the passage (33) of the inner catheter (3) is circular.

9. The catheter arrangement according to one of the claims 1 through 8, characterized in that the inner catheter (3) and the outer catheter (2) near the distal end are marked with a material that is detectable by X-rays.

10. The catheter arrangement according to one of the claims 1 through 9, characterized in that the inner catheter (3) and the outer catheter (2) are comprised of torsionally stable material with approximately identical stiffness.

11. The catheter arrangement according to one of the claims 1 through 10, characterized in that the outer catheter (2) in the area of the lateral opening (23) is made of a bending-resistant and/or torsionally stiff material or is reinforced with such a material.

12. The catheter arrangement according to claim 11, characterized in that the outer catheter (2) is reinforced in the area of the lateral opening (23) with a sleeve or a mesh of metal and/or plastic material.

13. The catheter arrangement according to one of the claims 1 through 12, characterized in that the distal tip (3a) of the inner catheter is comprised of a memory material, preferably Nitinol, or a heat-treated plastic material.

14. The catheter arrangement according to one of the claims 1 through 13, characterized in that, at a proximal end, it has a manipulation instrument (M) comprising a control mechanism for moving the inner catheter (2) within the outer catheter (3) in the axial direction, wherein the proximal end of the outer catheter (2) provides a guide for the proximal end of the inner catheter (3) that prevents a radial rotation of the catheters relative to one another.