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 . A distal tip of an intravascular blood pump, comprising:
an elongate portion configured to be coupled to the intravascular blood pump;
a curved distal portion distal to the elongate portion;
a self-sealing septum disposed at a distal end of the curved distal portion; and
a lumen passing through the elongate portion and the curved distal portion and terminating prior to the self-sealing septum,
wherein the self-sealing septum is configured to be punctured by a guidewire to allow the guidewire to gain access to the lumen, wherein the self-sealing septum is configured to self-seal upon removal of the guidewire to prevent blood or fluids from entering the lumen.
2 . The distal tip of claim 1 , wherein the curved distal portion comprises a J-tip.
3 . The distal tip of claim 1 , wherein the curved distal portion comprises a pigtail.
4 . The distal tip of claim 1 , further comprising a guide feature configured to direct a guidewire through the self-sealing septum to the lumen.
5 . 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 struts extending from the proximal end or the distal end of the conduit; and
a hub configured to receive the plurality of struts; and
a distal tip connected to the hub, the distal tip comprising a proximal section, a central section, and a distal section, wherein the central section is stiffer than the proximal section and the distal section.
6 . The pump of claim 5 , wherein the central section has a wall thickness that is greater than a wall thickness of the proximal section and the distal section.
7 . The pump of claim 5 , wherein the distal section is attached to the proximal section at the central section.
8 . The pump of claim 5 , wherein the proximal section includes a male shaped fitting configured to mate with a female shaped fitting of the distal section.
9 . The pump of claim 5 , further comprising an atraumatic tip coupled to the distal section.
10 . The pump of claim 5 , further comprising a guidewire lumen disposed within the distal tip.
11 . The pump of claim 10 , further comprising a self-sealing septum disposed at a distal end of the guidewire lumen.
12 . The pump of claim 11 , wherein the self-sealing septum is configured to be punctured to allow a guidewire to pass through.
13 . The pump of claim 12 , wherein the self-sealing septum is configured to re-seal itself when the guidewire is removed.
14 . A method of delivering an intravascular blood pump, the method comprising:
piercing a self-sealing septum of a distal tip with a guidewire to insert the guidewire into the blood pump;
positioning the blood pump at a target tissue location with the guidewire; and
retracting the guidewire into the distal tip to cause the self-sealing septum to re-seal.