Catheter device
The catheter device comprises a motor at the proximal end of the catheter device and a drive shaft, extending from the proximal end section to the distal end section of the catheter device, for driving a rotating element located at the distal end of the catheter device. The catheter device also comprises a hose-like catheter body which encompasses the drive shaft and extends from the proximal end section to the distal end section. At the proximal end of the catheter device, the drive shaft is connected to a motor by a clutch. The clutch is a magnetic clutch with a proximal and a distal magnet unit. The proximal magnet unit is connected to the motor and the distal magnet unit to the drive shaft. The distal magnet unit is mounted fluid-tight in a clutch housing. The proximal end of the catheter body makes a fluid-tight connection with the clutch housing.
1. A percutaneous heart pump system being configured for percutaneous insertion through a vascular system of a patient and positioning across an aortic valve, comprising:
a catheter having a tubular pump housing disposed at a distal portion of the catheter, the pump housing having distal inlet holes and proximal outlet holes and a tubular fluid flow surface that extends between the inlet and outlet holes and forms a contact interface for positioning across the aortic value;
a radially compressible helical rotor disposed within the pump housing, wherein the rotor includes a central bore;
a drive shaft disposed within the pump housing and having a proximal drive shaft portion and a distal drive shaft portion, wherein the proximal drive shaft portion is configured to couple to a motor and the distal drive shaft portion extends through the central bore of the rotor and is configured to rotate the rotor within the pump housing;
a body cap having a distal tip and a proximal opening; and
a distal bearing section positioned axially along the drive shaft at a position distal to the rotor, the distal bearing section comprising a tubular distal shaft protector having a central bore, the central bore comprising:
a proximal opening,
a distal opening, and
an interior cylindrical surface that surrounds the distal portion of the drive shaft;
wherein the drive shaft extends through the distal shaft protector and into the proximal opening of the body cap.
2. The system of claim 1 , wherein the distal shaft protector has a cylindrical surface axially aligned with the drive shaft.
3. The system of claim 2 , wherein the pump housing comprises a self-expanding mesh tube configured to expand from a collapsed state to an expanded state, and the distal shaft protector is disposed within the mesh tube.
4. The system of claim 3 , wherein the distal bearing section includes a distal support that extends radially about the distal shaft protector and the drive shaft.
5. The system of claim 4 , wherein the radially extending distal support contacts the mesh tube.
6. The system of claim 5 , wherein the radially extending distal support centers the drive shaft within the mesh tube in the expanded state of the mesh tube.
7. The system of claim 6 , wherein the radially extending distal support has a proximal region with a first diameter and a distal region with a second diameter.
8. The system of claim 7 , wherein the first diameter is smaller than the second diameter.
9. The system of claim 8 , wherein the radially extending distal support comprises a cylindrical connection bush.
10. The system of claim 3 , wherein the mesh tube is surrounded by a substantially liquid-proof seal.
11. The system of claim 3 , wherein the rotor is formed from an elastic material such that the rotor automatically unfolds when released from the mesh tube.
12. The system of claim 11 , wherein the rotor comprises a continuous helical rotor blade having a length.
13. The system of claim 12 , wherein a pitch of the continuous helical rotor blade varies along the length of the blade.
14. The system of claim 2 , wherein the rotor is coupled to the drive shaft by a rotor connector.
15. The system of claim 14 , wherein the rotor connector comprises a non-positive connector.
16. The system of claim 14 , wherein the rotor connector comprises a clamp.
17. The system of claim 2 , wherein the distal bearing section comprises a sliding distal bearing.
18. The system of claim 1 , wherein the body cap is distal of the pump housing.
19. The system of claim 18 , wherein the body cap comprises a distal atraumatic ball.
20. The system of claim 19 , wherein the distal atraumatic ball is configured to space the pump housing from an interior wall of the patient's vessel.