System for introducing a pump

Patent metadata

Field	Value
Publication number	US-9974893-B2
Application number	US-201113261529-A
Country	US
Kind code	B2
Filing date	Jun 24, 2011
Priority date	Jun 25, 2010
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

The invention resides in the field of introducing fluid pumps into a lumen and relates to a system for introducing a pump into a lumen which comprises a first sheath and a pump to be introduced into the first sheath, or a system which has a pump with a distal pump unit and a shaft catheter which emerges proximally to the pump unit.
According to the invention one or two sheaths are used, the distal pump unit being pulled firstly into the distal end of one sheath, in order to avoid damage to a shaft catheter. Subsequently, the sheath receiving the pump unit is transferred into a further sheath or a receiving lumen.

First claim

The invention claimed is:

1. A system for introducing a pump into a lumen, comprising:
a first sheath having a first sheath lumen;
an expandable rotary pump to be introduced into the first sheath, wherein the first sheath lumen is sized to receive the pump when the pump is compressed, wherein the pump includes a rotor which is configured to assume a compressed state and an expanded state, and wherein the pump is coupled at a proximal end to a catheter; and
a second sheath having a second sheath lumen sized to allow passage of the compressed pump through the second sheath lumen;
wherein the pump is configured to be guidably moved into the second sheath lumen through a distal end of the second sheath, and wherein the proximal end of the pump is configured to be pulled into the second sheath by the catheter, the pump is restricted in diameter by the second sheath, and the rotor is in the compressed state when the pump is positioned in the second sheath; and
wherein the distal end of the second sheath is configured to be coupled to the proximal end of the first sheath for transferring the pump into the first sheath lumen, wherein the pump is configured to be pushed into the first sheath by the catheter and maintain the rotor in the compressed state, and wherein the pump and rotor are configured to expand from the compressed state after being pushed out of a distal end of the first sheath.

2. The system according to claim 1 , wherein the first sheath has, at the proximal end thereof, a first sheath valve, the first sheath lumen widening towards the proximal end thereof and being configured such that the distal end of the second sheath can be introduced into the sheath valve.

3. The system according to claim 2 , wherein the second sheath is a tear-off sheath which can be torn along the entire length of the second sheath.

4. The system according to claim 3 , wherein at least one of the first and second sheath has a plastic material.

5. The system according to claim 4 , further comprising a guide wire, the guide wire having a cross-sectional area such that the guide wire can be guided through the first sheath lumen.

6. The system according to claim 5 , further comprising a device for retaining a portion of the second sheath.

7. The system according to claim 6 , wherein the device has a cavity which encloses an outer side of the second sheath along the retained portion and which frictionally retains the second sheath.

8. The system according to claim 7 , wherein the second sheath can be received by the device over at least half of the length of the second sheath.

9. The system according to claim 8 , wherein the device retains the retained portion of the second sheath such that the retained portion of the second sheath has a curvature of less than 10°.

10. The system according to claim 9 , wherein the device retains the retained portion of the second sheath such that the retained portion of the second sheath has a curvature of less than 5°.

11. The system according to claim 10 , wherein the first sheath or the second sheath is 40-120 cm in length.

12. The system of claim 1 , further comprising:
a flexible driveshaft coupled to the pump; and
a third sheath covering the drive shaft.

13. The system of claim 1 , wherein the second sheath lumen is sized to enclose the pump.

14. The system of claim 13 , wherein the second sheath has a length of at least 2 cm.

15. The system of claim 1 , wherein the first sheath further comprises a hemostatic valve.

16. The system of claim 15 , wherein the distal end of the second sheath is configured to couple to the hemostatic valve.

17. The system according to claim 1 , wherein the catheter is configured as a flexible catheter.

18. A method for introducing a pump into a receiving lumen in a patient by means of a system comprising a first sheath having a first sheath lumen, and a second sheath with a second sheath lumen, the method comprising:
a) introducing the first sheath into the receiving lumen, wherein a proximal end of the first sheath is outside the receiving lumen;
b) positioning a proximal end of the pump at an opening of the distal end of the second sheath lumen, wherein the pump is coupled at its proximal end to a catheter which extends through the second sheath lumen;
c) moving the distal end of the pump into the second sheath lumen through the distal end of the second sheath by pulling the catheter coupled to the pump through the second sheath in a proximal direction, wherein the second sheath restricts a diameter of the pump such that the rotor assumes a compressed state inside the second sheath lumen;
d) after moving the distal end of the pump into the second sheath lumen, coupling the distal end of the second sheath to the proximal end of the first sheath;
e) transferring the pump from the second sheath into the first sheath by pushing the catheter through the second sheath in a distal direction, wherein the first sheath maintains the diameter of the pump in a compressed state; and
f) transferring the pump from the first sheath into the receiving lumen by pushing the catheter through the first sheath in the distal direction, wherein the pump and rotor are configured to expand from the compressed state upon exiting the first sheath lumen.

19. The method according to claim 18 , wherein the distal end of the pump is guided into the receiving lumen through the distal end of the first sheath lumen or of the second sheath lumen.

20. The method of claim 18 , wherein receiving the pump in the second sheath lumen comprises enclosing the pump in the second sheath.

21. The method of claim 20 , wherein the second sheath has a length of at least 2 cm.

22. The method of claim 18 , wherein the proximal end of the first sheath comprises a hemostatic valve.

23. The method of claim 22 , wherein coupling the distal end of the second sheath to the proximal end of the first sheath comprises coupling a distal end of the second sheath to the hemostatic valve.

24. The method according to claim 18 , wherein the catheter is a flexible catheter.

Assignees

• Toellner Thomas
• Ecp Entw Mbh

Inventors

• Toellner Thomas

Classifications

• A61M1/1034

  Human Necessities · mapped topic

• A61M1/101

  Human Necessities · mapped topic

• A61M1/122

  Human Necessities · mapped topic

• A61M25/0668

  splittable, tear apart · CPC title

• A61M1/1024

  Human Necessities · mapped topic