Centrifugal pump

Patent metadata

Field	Value
Publication number	US-2017143884-A1
Application number	US-201715425124-A
Country	US
Kind code	A1
Filing date	Feb 6, 2017
Priority date	Sep 19, 2014
Publication date	May 25, 2017
Grant date	—

Abstract

A centrifugal pump for pumping blood includes a housing 2 with a housing main body 20 , a blood inlet port 25 , and a blood outlet port 26 . A rotary body 3 is rotatably accommodated inside the housing main body 20 , and a support mechanism 4 supports the rotary body 3 . The support mechanism 4 is provided with a rod-like shaft member 5 , and a first bearing 6 and a second bearing 7 which respectively and rotatably support end portions of the shaft member 5 . The first bearing 6 is provided with a protruding portion 62 which protrudes in an eccentric manner with respect to a rotation center O when viewed from an upstream side of a blood flow, so that the protruding portion shields a counter-rotating, longitudinal side of the shaft member from exposure to the main flow of blood.

First claim

What is claimed is:

1 . A centrifugal blood pump comprising:
a housing having a main body enclosing a pumping chamber, wherein the main body defines a blood inlet port which is formed so as to protrude from the housing main body and which communicates with the pumping chamber, and wherein the main body defines a blood outlet port which is provided at a position radial different from that of the blood inlet port; a centrifugal force applying member that is rotatably accommodated inside the pumping chamber and rotates to apply centrifugal force to blood; and a support mechanism that supports the centrifugal force applying member such that the centrifugal force applying member can rotate with respect to the housing; wherein the support mechanism comprises a shaft member which is installed along a rotational center axis of the centrifugal force applying member, a first bearing which is installed inside the blood inlet port and rotatably supports one end portion of the shaft member, and a second bearing which rotatably supports the other end portion of the shaft member; and wherein the first bearing is provided with a protruding portion which extends in an eccentric manner with respect to an end of the shaft member supported by the first bearing when viewed from an upstream position within the inlet port.

2 . The centrifugal pump according to claim 1 wherein the protruding portion shields a longitudinal side of the shaft member preventing a reverse flow of blood inside the blood inlet port.

3 . The centrifugal pump according to claim 1 wherein the protruding portion forms a semi-columnar shape which covers one half of a circumference of the shaft member.

4 . The centrifugal pump according to claim 1 :
wherein a connection portion of the blood inlet port forms a cylindrical shape which is inclined with respect to the rotational center axis; and wherein the protruding portion has an inclined distal edge which inclines in a same direction as an inner peripheral surface of the connection portion of the blood inlet port.

5 . The centrifugal pump according to claim 4 :
wherein the blood inlet port is provided with a recessed portion of which an inner peripheral portion is formed to receive the first bearing; and wherein the inclined distal edge of the protruding portion is positioned at a distance equal to or less than a distance between the inner peripheral surface of the connection portion of the blood inlet port and a central axis of the connection portion of the blood inlet port.

6 . The centrifugal pump according to claim 4 further comprising:
a flow straightening portion that is formed to protrude from the inner peripheral surface of the connection portion of the blood inlet port, wherein the flow straightening portion has a substantially triangular profile which defines an apex extending longitudinally in the connection portion.

7 . The centrifugal pump according to claim 6 wherein the substantially triangular profile of the flow straightening portion has a width and a protruding height which gradually become smaller toward an upstream side.

Assignees

• Terumo Corp

Inventors

• Tanaka Shotaro
• Itamochi Yosuke

Classifications

• F04D13/06

  the pump being electrically driven · CPC title

• F04D29/043

  Shafts · CPC title

• A61M1/1013 Primary

  Human Necessities · mapped topic

• F04D29/046

  Bearings · CPC title

• F04D7/04 Primary

  the fluids being viscous or non-homogenous · CPC title