BLOOD PUMP SYSTEMS AND METHODS
Catheter blood pumps that include an expandable conduit coupled to at least one hub shaped to promote smooth blood flow. In some examples, the at least one hub includes non-metallic configuration and the struts comprise a metallic configuration (e.g., nitinol). The hub can include one or more layers, including a combination of Chronoflex and Pebax.
1 . An intravascular blood pump, comprising:
a collapsible conduit having an inner lumen for passing fluid therethrough, the conduit comprising a proximal end having a proximal opening, and a distal end having a distal opening;
at least one impeller within the conduit, the at least one impeller arranged to pump fluid into the distal opening of the conduit and out of the proximal opening of the conduit;
a plurality of metallic struts extending from the proximal end or the distal end of the conduit; and
a hub configured to receive the plurality of metallic struts, the hub comprising at least one non-metallic layer.
2 . The pump of claim 1 , wherein the hub comprises a first non-metallic layer and a second non-metallic layer disposed around the plurality of metallic struts.
3 . The pump of claim 2 , wherein the first non-metallic layer comprises a thermoplastic urethane.
4 . The pump of claim 2 , wherein the second non-metallic layer comprises Pebax.
5 . The pump of claim 1 , wherein the at least one non-metallic layer is configured to encompass or surround the plurality of metallic struts.
6 . The pump of claim 2 , wherein the first non-metallic layer and the second non-metallic layer are heat treated so as to meld together around the plurality of metallic struts.
7 . The pump of claim 1 , wherein the hub comprises a distal hub positioned adjacent to the distal opening.
8 . The pump of claim 1 , further comprising a bullet-shaped tapering section extending proximally from where the plurality of metallic struts are joined to the distal hub.
9 . The pump of claim 1 , wherein the plurality of metallic struts comprise nitinol.
10 . The pump of claim 1 , wherein the plurality of metallic struts comprises 4, 5, 6, 7, or 8 struts.
11 . An intravascular blood pump, comprising:
a collapsible conduit having an inner lumen for passing fluid therethrough, the conduit comprising a proximal end having a proximal opening, and a distal end having a distal opening;
a proximal impeller positioned at least partially within the conduit near the proximal opening, the at least one impeller arranged to pump fluid into the distal opening of the conduit and out of the proximal opening of the conduit;
a plurality of metallic struts extending from the distal end of the conduit; and
a distal hub configured to receive the plurality of metallic struts, the hub comprising at least one non-metallic layer configured to encapsulate the plurality of metallic struts.
12 . The pump of claim 11 , wherein the hub comprises a first non-metallic layer and a second non-metallic layer disposed around the plurality of metallic struts.
13 . The pump of claim 12 , wherein the first non-metallic layer comprises a thermoplastic urethane.
14 . The pump of claim 12 , wherein the second non-metallic layer comprises Pebax.
15 . The pump of claim 11 , wherein the at least one non-metallic layer is configured to encompass or surround the plurality of metallic struts.
16 . The pump of claim 12 , wherein the first non-metallic layer and the second non-metallic layer are heat treated so as to meld together around the plurality of metallic struts.
17 . The pump of claim 11 , wherein the hub comprises a distal hub positioned adjacent to the distal opening.
18 . The pump of claim 11 , further comprising a bullet-shaped tapering section extending proximally from where the plurality of metallic struts are joined to the distal hub.
19 . The pump of claim 11 , wherein the plurality of metallic struts comprise nitinol.
20 . The pump of claim 11 , wherein the plurality of metallic struts comprises 4, 5, 6, 7, or 8 struts.
21 . A method of manufacturing an intravascular blood pump, the method comprising:
placing one or more metallic struts of a blood conduit on or near a first non-metallic hub layer;
placing a second non-metallic hub layer on or over the one or more metallic struts; and
applying a heat treatment to the one or more metallic struts, the first non-metallic hub layer, and the second non-metallic hub layer to meld or melt the first and second non-metallic hub layers around the one or more metallic struts.
22 . The method of claim 21 , further comprising, prior to the applying a heat treatment step, applying a shrink tubing over the second non-metallic hub layer.
23 . The method of claim 22 , further comprising removing the shrink tubing after applying the heat treatment.