Catheter pump with positioning brace
A catheter pump assembly is provided that includes an elongate body assembly, a shaft, and an impeller. The assembly has a proximal end, a distal end and at least one lumen extending therebetween. The shaft is disposed at least partially within the elongate body, e.g., in the at least one lumen, and journaled for rotation. The impeller is coupled with a distal portion of the shaft. The impeller is configured to be rotated to induce flow of blood when the impeller is placed in fluid communication with a source of blood. An inflatable balloon brace is disposed on an outer surface of the catheter pump. The inflatable balloon brace is spaced proximally of the impeller and has a low profile configuration for delivery through the vasculature and an expanded configuration for disposing (e.g., position and/or orienting) the impeller within the source of blood.
1. A catheter pump assembly, comprising:
an elongate body assembly having a proximal end, a distal end, and at least one lumen extending therebetween;
a shaft disposed at least partially within the elongate body and journaled for rotation;
an impeller coupled with a distal portion of the shaft, the impeller configured to rotate to induce a flow of blood; and
an anchor comprising a plurality of lobes disposed along an outer surface of the catheter pump assembly at an intermediate location and configured to be mechanically deployed outwardly therefrom to engage a vascular segment to hold in place a portion of the catheter pump assembly disposed in the patient.
2. The catheter pump assembly of claim 1 , wherein each lobe of the plurality of lobes comprises an arcuate portion defining a convex outer curvature that engages the vascular segment.
3. The catheter pump assembly of claim 2 , wherein the convex outer curvature defines an apex that, when the lobe is deployed, is disposed away from a longitudinal axis of the elongate body assembly by a distance greater than an average radius of the vascular segment.
4. The catheter pump assembly of claim 1 further comprising a sheath assembly within which the elongate assembly is configured to be compressed, and wherein the plurality of lobes are configured to be compressed with the sheath assembly for delivery and withdrawal of the catheter pump assembly.
5. The catheter pump assembly of claim 4 , wherein each lobe of the plurality of lobes comprises an inclined portion with which the sheath assembly engages to initiate compression of the plurality of lobes into the sheath assembly.
6. The catheter pump assembly of claim 5 , wherein the sheath assembly comprises an expandable distal conical portion configured to engage the inclined portions of the plurality of lobes.
7. The catheter pump assembly of claim 1 , wherein the plurality of lobes comprises four lobes equally distributed circumferentially around the outer surface of the catheter pump assembly at the intermediate location.
8. The catheter pump assembly of claim 1 , wherein each lobe of the plurality of lobes is petal-shaped and comprises:
an inclined portion that couples the lobe to the outer surface of the catheter pump assembly;
a first arm having an arcuate shape and extending distally from the inclined portion; and
a second arm, symmetrical to the first arm, extending distally from the inclined portion, and joining the first arm at a distal point of the lobe.
9. The catheter pump assembly of claim 1 , wherein the plurality of lobes comprise a shape memory material.
10. The catheter pump assembly of claim 9 , wherein the shape memory material comprises a nickel-titanium alloy.
11. A method of positioning a catheter pump within a patient, comprising:
inserting a catheter pump into a peripheral vascular location, the catheter pump having an elongate body, an impeller assembly disposed at a distal portion of the elongate body, and an anchor disposed proximally of the impeller assembly;
advancing the distal portion of the elongate body to a heart of the patient;
mechanically deploying a plurality of lobes of the anchor outwardly from an outer surface of the elongate body into contact with a vascular segment of the patient; and
operating the impeller assembly within the heart to induce a flow of blood.
12. The method of claim 11 , wherein advancing comprises positioning the impeller assembly in fluid communication with a left ventricle of the patient.
13. The method of 12 , wherein advancing comprises positioning the impeller assembly at least partially within the left ventricle.
14. The method of 11 , wherein mechanically deploying the plurality of lobes comprises engaging, with respective arcuate portions of the plurality of lobes, a descending aorta of the patient, between the left subclavian artery and the peripheral vascular location.
15. The method of claim 11 , wherein mechanically deploying the plurality of lobes comprises engaging, with respective arcuate portions of the plurality of lobes, an ascending aorta of the patient, between the heart and the brachiocephalic artery.
16. The method of claim 11 , wherein mechanically deploying the plurality of lobes comprises engaging, with respective arcuate portions of the plurality of lobes, an ascending aorta of the patient, between the coronary arteries and the brachiocephalic artery.
17. The method of claim 11 further comprising advancing a sheath assembly of the catheter pump distally, relative to the anchor, to compress the plurality of lobes of the anchor therein for withdrawal of the catheter pump from the patient.
18. The method of claim 17 further comprising further advancing the sheath assembly of the catheter pump distally, relative to the impeller assembly, to compress the impeller assembly for withdrawal of the catheter pump from the patient.
19. The method of claim 17 , wherein advancing the sheath assembly comprises engaging an inclined portion of the plurality of lobes to initiate compression of the plurality of lobes into the sheath assembly.
20. The method of claim 17 further comprising withdrawing the sheath assembly proximally, relative to the anchor, to mechanically deploy the plurality of lobes of the anchor prior to operating the impeller assembly.