MALLEABLE CANNULA

• US 20140257018A1
• Filed: 03/07/2013
• Published: 09/11/2014
• Est. Priority Date: 03/07/2013
• Status: Active Grant

• Current Assignee: Circulite Inc. (Medtronic Plc)
• Original Assignee: Circulite Inc. (Medtronic Plc)
• Inventors: Farnan, Robert C.
• Granted Patent: US 10,688,230 B2
• Time in Patent Office: Days
• US Class Current: 600/16
• CPC Class Codes: A61M 60/104 Extracorporeal pumps, i.e. the blood being pumped outside the patient's body
• CPC Class Codes: A61M 60/178 drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
• CPC Class Codes: A61M 60/216 including a rotating member acting on the blood, e.g. impeller
• CPC Class Codes: A61M 60/857 Implantable blood tubes
• CPC Class Codes: A61M 60/861 Connections or anchorings for connecting or anchoring pumps or pumping devices to parts of the patient's body

Abstract

A malleable cannula. The malleable cannula includes a polymeric jacket and a malleable member. The malleable member, being surrounded by the jacket, includes a proximal end, a distal end, and a lumen extending therebetween and along a lengthwise axis of the malleable cannula. The malleable member further includes a longitudinal strut that is parallel to the lengthwise axis and a plurality of transverse struts coupled to and extending laterally away from the longitudinal strut and at least a portion of the lumen. The malleable member is configured to assume and maintain a shape of the malleable cannula.

Claims

1. A malleable cannula comprising:

a polymeric jacket; and

a malleable member surrounded by the jacket, the malleable member having a proximal end, a distal end, and a lumen extending therebetween and along a lengthwise axis of the malleable cannula, the malleable member including a longitudinal strut extending parallel to the lengthwise axis and a plurality of transverse struts coupled to and extending laterally from the longitudinal strut and around at least a portion of the lumen of the liner, the malleable member configured to assume and maintain a formed shape of the malleable cannula.

2. The malleable cannula of claim 1, wherein the malleable member further comprises:

a proximal strut coupled to and extending laterally from the longitudinal strut at a proximal end of the malleable member, the proximal strut extending at least partially around the lumen; and

a distal strut coupled to and extending laterally from the longitudinal strut at a distal end of the malleable member, the distal strut extending at least partially around the lumen,

wherein the proximal and distal struts have a width dimension that is greater than a width dimension of the traverse struts of the plurality to further anchor the malleable member within the jacket.

3. The malleable cannula of claim 2, wherein the proximal strut, the distal strut, and the plurality of transverse struts are constructed as a unitary structure.

4. The malleable cannula of claim 3, wherein the unitary structure further includes the longitudinal strut.

5. The malleable cannula of claim 1, wherein the malleable member is constructed from a metallic tube.

6. The malleable cannula of claim 1, wherein the malleable member is constructed from annealed steel, MP35N, tantalum, gold, or a combination thereof.

7. The malleable cannula of claim 1, wherein the plurality of transverse struts includes a spring, a helix, or a plurality of successive rings.

8. The malleable cannula of claim 1, wherein the transverse struts of the plurality are spaced apart by a pitch.

9. The malleable cannula of claim 1, further comprising:

a tip coupled to a distal end of the malleable cannula and configured to extend through a biological tissue.

10. The malleable cannula of claim 1, wherein the longitudinal strut is one of continuous or discontinuous along a longitudinal length of the malleable member.

11. The malleable cannula of claim 10, wherein the longitudinal strut is discontinuous and is comprised of a plurality of segments, each of the plurality of segments being circumferentially displaced from an adjacent one of the plurality of segments and about the plurality of transverse struts.

12. The malleable cannula of claim 10, wherein each of the plurality of segments is located at one of a number of circumferential positions about the plurality of struts, the number of circumferential positions being greater than 1.

13. The malleable cannula of claim 12, wherein a select one of the plurality of segments is circumferentially displaced from an adjacent one of the plurality of segments by 360 degrees divided by the number of circumferential positions about the plurality of transverse struts.

22. The cannula of claim 1, further comprising:

a liner coupled to an inner surface of the lumen of the malleable member.

14. A malleable cannula comprising:

a liner having a proximal end, a distal end, and a lumen extending therebetween and along a lengthwise axis of the malleable cannula;

a jacket surrounding the liner; and

a malleable member between the liner and the jacket, the malleable member including a longitudinal strut extending parallel to the lengthwise axis and a plurality of transverse struts coupled to and extending laterally from the longitudinal strut around at least a portion of the lumen of the liner, the malleable member configured to assume and maintain a formed shape of the malleable cannula.

15. The malleable cannula of claim 14, further comprising:

a proximal strut coupled to and extending laterally from the longitudinal strut at a proximal end of the malleable member, the proximal strut extending at least partially around the lumen; and

a distal strut coupled to and extending laterally from the longitudinal strut at a distal end of the malleable member, the distal strut extending at least partially around the lumen,

wherein the proximal and distal struts have a width dimension that is greater than a width dimension of the traverse struts of the plurality to further anchor the malleable member within the jacket.

16. The malleable cannula of claim 14, wherein the plurality of transverse struts includes a spring, a helix, or a plurality of successive rings.

17. The malleable cannula of claim 14, wherein the longitudinal strut is one of continuous or discontinuous along a longitudinal length of the malleable member.

18. The malleable cannula of claim 17, wherein the longitudinal strut is discontinuous and is comprised of a plurality of segments, each of the plurality of segments being circumferentially displaced from an adjacent one of the plurality of segments and about the plurality of transverse struts.

19. The malleable cannula of claim 17, wherein each of the plurality of segments is located at one of a number of circumferential positions about the plurality of struts, the number of circumferential positions being greater than 1.

20. The malleable cannula of claim 19, wherein a select one of the plurality of segments is circumferentially displaced from an adjacent one of the plurality of segments by 360 degrees divided by the number of circumferential positions and about the plurality of transverse struts.

21. A cannula for moving fluids between a pump and the circulatory system of a patient, the cannula comprising:

a malleable member having a proximal end, a distal end, and a lumen extending therebetween and along a lengthwise axis of the malleable cannula, the malleable member including a longitudinal strut extending parallel to the lengthwise axis and a plurality of transverse struts coupled to and extending laterally from the longitudinal strut and around at least a portion of the lumen of the liner, the malleable member configured to assume and maintain a formed shape of the malleable cannula;

a jacket surrounding the malleable member, a proximal end thereof configured to be connected to the pump and a distal end thereof configured to be connected to the circulatory system.

23. An inflow cannula for moving fluids from a chamber of the heart of a patient to a pump, the inflow cannula comprising:

a malleable member having a proximal end, a distal end, and a lumen extending therebetween and along a lengthwise axis of the malleable cannula, the malleable member including a longitudinal strut extending parallel to the lengthwise axis and a plurality of transverse struts coupled to and extending laterally from the longitudinal strut and around at least a portion of the lumen of the liner, the malleable member configured to assume and maintain a formed shape of the malleable cannula;

a jacket surrounding the malleable member;

a distally-positioned tip coupled to a distal end of the jacket and configured to be positioned across a wall of the heart; and

a proximally-positioned hub coupled to a proximal end of the jacket and configured to secure the inflow cannula to the pump.

24. The cannula of claim 23, further comprising:

a liner coupled to an inner surface of the lumen of the malleable member.