CATHETER DEVICE

• US 20090093796A1
• Filed: 09/15/2008
• Published: 04/09/2009
• Est. Priority Date: 10/08/2007
• Status: Active Grant

• Current Assignee: AIS GmbH Aachen Innovative Solutions (Johnson & Johnson)
• Original Assignee: AIS GmbH Aachen Innovative Solutions (Johnson & Johnson)
• Inventors: GUNTHER, Rolf W., SCHMITZ-RODE, Thomas, PFEFFER, Joachim Georg
• Granted Patent: US 8,439,859 B2
• Time in Patent Office: Days
• US Class Current: 604/530
• CPC Class Codes: A61M 25/0068 Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
• CPC Class Codes: A61M 25/0069 Tip not integral with tube
• CPC Class Codes: A61M 25/0074 Dynamic characteristics of the catheter tip, e.g. openable, closable, expandable or deformable
• CPC Class Codes: A61M 25/0082 Catheter tip comprising a tool
• CPC Class Codes: A61M 60/13 by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/253 including a displacement member directly acting on the blood
• CPC Class Codes: A61M 60/414 transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter
• CPC Class Codes: A61M 60/422 the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
• CPC Class Codes: F04D 29/181 Axial flow rotors F04D29/185 take precedence
• CPC Class Codes: F04D 29/242 Geometry, shape
• CPC Class Codes: F04D 29/247 elastic or self-adjusting
• CPC Class Codes: F04D 29/42 for radial or helico-centrifugal pumps
• CPC Class Codes: F04D 3/005 with a conventional single stage rotor
• CPC Class Codes: F04D 3/02 of screw type
• CPC Class Codes: Y10S 415/90 Rotary blood pump

Abstract

The catheter device comprises a drive shaft connected to a motor, and a rotor mounted on the drive shaft at the distal end section. The rotor has a frame structure which is formed by a screw-like boundary frame and rotor struts extending radially inwards from the boundary frame. The rotor struts are fastened to the drive shaft by their ends opposite the boundary frame. Between the boundary frame and the drive shaft extends an elastic covering. The frame structure is made of an elastic material such that, after forced compression, the rotor unfolds automatically.

Claims

1. A catheter device comprising:

a drive shaft connected to a motor;

a rotor mounted on the drive shaft at the distal end section, wherein the rotor has at least one frame structure which is formed by a screw-like boundary frame and rotor struts extending radially inwards from the boundary frame, wherein the rotor struts are fastened to the drive shaft by their ends opposite the boundary frame, wherein an elastic covering extends between the boundary frame and the drive shaft, and wherein the frame structure is made of an elastic material such that, after forced compression, the rotor unfolds automatically.

2. The catheter device according to claim 1, wherein the frame structure of the rotor is made of a memory material.

3. The catheter device according to claim 2, wherein the memory material is nitinol, plastic, an iron alloy or a copper alloy.

4. The catheter device according to claim 1, wherein the frame structure forms a rotor blade.

5. The catheter device according to claim 1, wherein the rotor has several frame structures.

6. The catheter device according to claim 1, wherein the rotor has several rotor blades.

7. The catheter device according to claim 1, wherein spacer sleeves are positioned between the rotor struts which are fitted on to the drive shaft.

8. The catheter device according to claim 7, wherein the spacer sleeves are shorter than the distance between the connection points of two adjacent rotor struts on the boundary frame.

9. The catheter device according to claim 1, wherein the elastic covering of the rotor is in the form of a polymer coating such as e.g. PU, PE, PP, silicone or parylene.

10. The catheter device according to claim 1, wherein the rotor blades extend over a wrap angle range of 45°

to 720° and

preferably 360°

around the drive shaft.

23. The catheter device according to claim 1, wherein the drive shaft is made of several, in particular six, wires, wound to left or right around a core.

24. The catheter device according to claim 1, further comprising a guide spiral wound in the opposite direction is fitted around the drive shaft.

25. The catheter device according to claim 1, wherein the drive shaft is encompassed by a catheter body.

11. A catheter device comprising

a drive shaft connected to a motor;

a rotor mounted on the drive shaft at the distal end section wherein the rotor is made of an elastic material such that, after forced compression, the rotor unfolds automatically;

a pump housing which encompasses the rotor with a tubular pump section, wherein the pump housing is formed by a mesh, the openings of which are closed by means of an elastic covering, at least in the area of the pump section.

12. The catheter device according to claim 11, wherein the mesh of the pump housing is made of a memory material.

13. The catheter device according to claim 12, wherein the memory material is nitinol, plastic, an iron alloy or a copper alloy.

14. The catheter device according to claim 11, wherein the elastic covering of the pump housing is in the form of a polymer coating such as e.g. PU, PE, PP, silicone or parylene.

15. The catheter device according to claim 11, wherein the pump housing has a distal connection section, a conical intake section, the pump section, a conical outlet section and a proximal connection section.

16. The catheter device according to claim 15, wherein the mesh has larger mesh openings in the conical sections than in the other sections.

17. The catheter device according to claim 15, wherein the mesh openings in the conical sections are open.

18. The catheter device according to claim 11, wherein a spherical body cap is provided at the distal end of the pump housing.

19. The catheter device according to claim 18, wherein a through bore is formed transversely in the body cap.

20. The catheter device according to claim 19, wherein the body cap is made of a material such as e.g. PE, PP, polyether etherketone (PEEK), polyvinyl chloride (PVC), Teflon (PTFE), acrylic glass, epoxy resin, PU, carbon fibre, coated materials, composite materials, or a polyether block amide.

21. The catheter device according to claim 11, further comprising an expandable outlet hose, attached to the pump housing in the area of the pump section and extending in the flow direction.

22. The catheter according to claim 21, wherein each of the connection sections the pump housing has a hose-like shaft protector in which the drive shaft is pivotably mounted.