Catheter Device

• US 20090204197A1
• Filed: 06/16/2006
• Published: 08/13/2009
• Est. Priority Date: 06/16/2005
• Status: Active Grant

• Current Assignee: Angiomed GmbH & Co. Medizintechnik KG
• Original Assignee: Angiomed GmbH & Co. Medizintechnik KG
• Inventors: Elsässer, Erhard, Dorn, Jürgen, Wuebbeling, Martin
• Granted Patent: US 8,323,326 B2
• Time in Patent Office: Days
• US Class Current: 623/1.110
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61M 2025/0004 having two or more concentrically arranged tubes for forming a concentric catheter system
• CPC Class Codes: A61M 2025/0175 having telescopic features, interengaging nestable members movable in relations to one another

Abstract

A catheter device having a shaft that extends from a proximal end to a distal end to carry on its distal end a self-expanding implant for intraluminal advance on a guidewire and delivery of the implant to an implant site by proximal withdrawal of a longitudinal sheath that lies radially outside the implant in the catheter, the catheter including a first shaft element to pull the sheath proximally and a second shaft element to push the implant distally to prevent the implant moving proximally with the sheath when the sheath is pulled proximally, wherein the sheath is freely rotatable with respect to the first shaft element during the said intraluminal advance and, during proximal movement, is caused to abut the first shaft element at an abutment position by a reduced inner diameter portion of the sheath proximal of the abutment position.

Claims

1. A catheter device having a shaft that extends from a proximal end to a distal end to carry on its distal end a self-expanding implant for intraluminal advance on a guidewire and delivery of the implant to an implant site by proximal withdrawal of a longitudinal sheath that lies radially outside the implant in the catheter, the catheter including a first shaft element to pull the sheath proximally and a second shaft element to push the implant distally to prevent the implant moving proximally with the sheath when the sheath is pulled proximally, wherein

the sheath is freely rotatable with respect to the first shaft element during the said intraluminal advance and, during proximal movement, is caused to abut the first shaft element at an abutment position by a reduced inner diameter portion of the sheath proximal of the abutment position.

2. Catheter as claimed in claim 1, wherein a first outer ring is provided radially outside the sheath and the first shaft element and proximal of the abutment position to reduce the inner diameter of the sheath.

3. Catheter as claimed in claim 1, wherein a second outer ring is provided radially outside the sheath and the first shaft element and distal of the abutment position to reduce the inner diameter of the sheath.

4. Catheter as claimed in claim 1, wherein the sheath is free of radial compression in the proximity of the abutment position.

5. Catheter as claimed in claim 1, wherein the first shaft element is a pull wire and the second shaft element comprises a pusher-guider tube.

6. Catheter as claimed in claim 5, wherein the pull wire comprises at its distal end an inner pull ring located radially inside the sheath, the inner pull ring causing to abut the reduced diameter portion of the sheath, when pulling the sheath proximally.

7. Catheter as claimed in claim 1, wherein

the first shaft element is a pull wire and the second shaft element comprises a pusher-guider tube

wherein a second outer ring is provided radially outside the sheath and the first shaft element and distal of the abutment position to reduce the inner diameter of the sheath wherein

the pull wire comprises at its distal end an inner pull ring located radially inside the sheath the inner pull ring causing to abut the reduced diameter portion of the sheath, when pulling the sheath proximally.

8. Catheter as claimed in claim 6, wherein the pull wire and the inner pull ring being both metal and with a metal bond between the pull wire and the pull ring.

9. Catheter as claimed in claim 3 wherein the two outer rings are swaged onto the outer surface of the sheath.

10. Catheter as claimed in claim 9, wherein the two rings are swaged onto the outer surface of the sheath such that the outer surface of the two rings is flush with the outer surface of the sheath.

14. Catheter as claimed in claim 1, wherein the sheath radially outside the pull ring is free of radial compression.

18. Catheter as claimed in claim 1, including a self-expanding stent.

19. Catheter as claimed in claim 2, wherein a second outer ring is provided radially outside the sheath and the first shaft element and distal of the abutment position to reduce the inner diameter of the sheath.

20. Catheter as claimed in claim 7, wherein the pull wire and the inner pull ring being both metal and with a metal bond between the pull wire and the pull ring.

11. A catheter device having a shaft that extends from a proximal end to a distal end to carry on its distal end a self-expanding implant for intraluminal advance on a guidewire and delivery of the implant to an implant site by proximal withdrawal of a longitudinal sheath that lies radially outside the implant in the catheter, the catheter including a first shaft element to pull the sheath proximally and a second shaft element to push the implant distally to prevent the implant moving proximally with the sheath when the sheath is pulled proximally, and further comprising a pull ring at the distal end of the first shaft element, radially inside the sheath, and separated from the sheath by an annular gap radially outside the pull ring so that the sheath is free to rotate relative to the pull ring during said intraluminal advance.

12. Catheter as claimed in claim 11, wherein a first outer ring is provided radially outside the sheath and the first shaft element and proximal of the pull ring, to reduce the inner diameter of the sheath proximal of the pull ring.

13. Catheter as claimed in claim 11, wherein a second outer ring is provided radially outside the sheath and the first shaft element and distal of the pull ring, to reduce the inner diameter of the sheath distal of the pull ring.

15. Catheter as claimed in claim 11, wherein the first shaft element is a pull wire and the second shaft element comprises a pusher-guide tube.

16. Catheter as claimed in claim 15, wherein the pull wire and the pull ring are both of metal and are connected by a metal bond.

17. Catheter as claimed in claim 11 wherein the sheath is polymeric and carries within its wall thickness a braid of metallic filaments.

21. Catheter as claimed in claim 12, wherein a second outer ring is provided radially outside the sheath and the first shaft element and distal of the pull ring, to reduce the inner diameter of the sheath distal of the pull ring.