THROMBECTOMY CATHETER SYSTEMS

• US 20130267891A1
• Filed: 09/28/2012
• Published: 10/10/2013
• Est. Priority Date: 01/26/2012
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Malhi, Arnaz, Deshpande, Manish, Hutton, Daniel, Shaltis, Philip
• Granted Patent: US 9,238,122 B2
• Time in Patent Office: Days
• US Class Current: 604/30
• CPC Class Codes: A61B 17/32037 for removing obstructions from inner organs or blood vessels, e.g. for atherectomy
• CPC Class Codes: A61M 25/0067 characterised by the distal end, e.g. tips A61M25/0054, A61M25/04 take precedence; balloon catheters A61M25/10
• CPC Class Codes: A61M 25/0069 Tip not integral with tube
• CPC Class Codes: A61M 25/0082 Catheter tip comprising a tool

Abstract

A thrombectomy catheter system is disclosed which includes a catheter having an exhaust lumen, an infusion lumen and a high pressure tube. The high pressure tube includes a nozzle orifice for forming a high pressure jet of fluid for cutting occlusive material from within a body lumen. The nozzle orifice is positioned to direct the high pressure jet of fluid into the distal end of the exhaust lumen which creates a suctioning effect. The infusion lumen replaces fluid that is removed from the body lumen through the exhaust lumen by a suctioning effect created by the fluid jet.

Claims

1. A thrombectomy catheter system comprising:

a catheter including a catheter body defining an exhaust lumen and an infusion lumen and including a high pressure tube, the high pressure tube having a nozzle orifice positioned to direct a fluid jet into a distal opening of the exhaust lumen;

a source of infusion fluid communicating with a proximal end of the infusion lumen; and

a fluid control device fluidly coupled between the thrombectomy catheter and the source of infusion fluid, the fluid control device being adapted to regulate a flow rate of infusion fluid from the source of infusion fluid to the infusion lumen of the thrombectomy catheter.

2. The thrombectomy catheter system according to claim 1, wherein the infusion fluid and fluid in the high pressure tube is selected from the group consisting of saline, a thrombolytic agent, a contrast medium, and combinations thereof.

3. The thrombectomy catheter system according to claim 1, wherein the high pressure tube defines a bent portion at the distal end of the high pressure tube, the nozzle orifice being positioned in the bent portion.

4. The thrombectomy catheter system according to claim 1, wherein the bent portion extends along an axis which is substantially transverse to a longitudinal axis of the thrombectomy catheter.

5. The thrombectomy catheter system according to claim 1, further including a source of high pressure fluid communicating with the high pressure tube, the source of high pressure fluid supplying high pressure fluid to the high pressure tube at a pressure of between about 100 psi and about 10,000 psi.

6. The thrombectomy catheter system according to claim 1, further including a substantially rigid positioning band secured to a distal end of the catheter body, the positioning band defining an exhaust lumen which communicates with the exhaust lumen of the catheter body and an infusion lumen which communicates with the infusion lumen of the catheter body.

7. The thrombectomy catheter system according to claim 6, wherein the high pressure tube is bonded to the positioning band.

8. The thrombectomy catheter system according to claim 7, wherein the high pressure tube and the positioning band are formed of metal.

9. The thrombectomy catheter system according to claim 7, wherein the high pressure tube and the positioning band are formed from plastic.

10. The thrombectomy catheter system according to claim 6, wherein the high pressure tube extends through the infusion lumen of the catheter body and of the positioning band.

11. The thrombectomy catheter system according to claim 10, wherein the infusion lumen of the positioning band defines a pair of concavities dimensioned to receive the high pressure tube and prevent lateral movement of the high pressure tube in relation to the positioning band.

12. The thrombectomy catheter system according to claim 1, wherein the fluid control device includes an adjustable valve adapted to regulate the infusion fluid flow rate into the infusion lumen of the thrombectomy catheter from the source of infusion fluid.

13. The thrombectomy catheter system according to claim 12, wherein the adjustable valve is adapted to vary the flow rate of infusion fluid to the thrombectomy catheter cyclically.

14. The thrombectomy catheter system according to claim 1, wherein the fluid control device includes a fluid pump for supplying infusion fluid to the thrombectomy catheter from the source of infusion fluid.

15. The thrombectomy catheter system according to claim 14, wherein the fluid pump is adapted to vary the flow rate of infusion fluid to the thrombectomy catheter cyclically.

16. The thrombectomy catheter system according to claim 1, wherein the thrombectomy catheter further includes an atraumatic tip.

17. The thrombectomy catheter system according to claim 16, wherein the atraumatic tip includes a pair of infusion channels which communicate with the infusion lumen of the positioning band and a reservoir for receiving the bent portion of the high pressure tube, the reservoir having an upper opening.

18. The thrombectomy catheter system according to claim 17, wherein the infusion channels extend distally of the bent portion of the high pressure tube.

19. The thrombectomy catheter system according to claim 1, further including a guide catheter defining a guide lumen dimensioned to receive the thrombectomy catheter, a proximal balloon, and a distal balloon.

20. The thrombectomy catheter system according to claim 19, wherein a portion of the guide catheter between the proximal balloon and the distal balloon has a sinusoidal shape and defines a plurality of openings which provide access to the thrombectomy catheter.

21. The thrombectomy catheter system according to claim 19, wherein a portion of the guide catheter between the proximal balloon and the distal balloon is flexible and defines a plurality of openings which provide access to the thrombectomy catheter, the flexibility of the portion of the guide catheter is such that a sinusoidal shape imparted to thrombectomy catheter is taken by the guide catheter once the thrombectomy catheter is inserted into the guide catheter.

22. The thrombectomy catheter system according to claim 1, further including a sensor configured to measure the pressure within a body lumen.

23. The thrombectomy catheter system according to claim 22, wherein the sensor is configured to control operation of the fluid control device.

24. The thrombectomy catheter system according to claim 1, further including a recirculation channel positioned to recirculate fluid from within the exhaust lumen back into a body lumen.

25. The thrombectomy catheter system according to claim 24, further including a filter positioned upstream of the recirculation channel, the filter being sized to prevent passage of solid particles into the recirculation channel.

26. The thrombectomy catheter system according to claim 25, wherein the exhaust lumen is divided into a first exhaust lumen section and a second exhaust lumen section by a dividing wall, and the filter and the recirculation channel are positioned in the first exhaust lumen section.

27. The thrombectomy catheter system according to claim 26, wherein the filter is positioned at one end of the first exhaust lumen section and is angled to direct solid particles into the second exhaust lumen section.

28. The thrombectomy catheter system according to claim 1, further including a recirculation channel extending between the exhaust lumen and the high pressure tube.

29. The thrombectomy catheter system according to claim 28, farther including a filter in the recirculation channel, the filter configured to enable small solid particles to enter the high pressure tube.

30. The thrombectomy catheter system according to claim 1, further including a macerating structure positioned within the exhaust lumen and configured to break up occlusive material.

31. The thrombectomy catheter system according to claim 30, wherein the macerating structure includes a grate having sharp cutting edges.

32. The thrombectomy catheter system according to claim 30, wherein the macerating structure includes a rotatable turbine configured to grind occlusive material.

33. The thrombectomy catheter according to claim 1, further including a body defining a cutting window between the nozzle orifice and an inlet to the exhaust lumen, and a separator positioned adjacent the window to cover the window, wherein the separator is configured to minimize the amount of tissue entering the cutting window.