Blood pump with separate mixed-flow and axial-flow impeller stages, components therefor and related methods
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61M-001/10
A61M-001/12
F04D-003/00
출원번호
US-0275912
(2011-10-18)
등록번호
US-9775936
(2017-10-03)
발명자
/ 주소
Wu, Jingchun
Verkaik, Josiah
출원인 / 주소
WorldHeart Corp.
대리인 / 주소
Christopher & Weisberg, P.A.
인용정보
피인용 횟수 :
1인용 특허 :
46
초록▼
A rotordynamic pump for delivering continuous flow of fluids, such as blood, is provided. In one embodiment, the pump includes a stator housing having an inlet and an outlet. A rotor hub is disposed within the stator housing having a first, mixed-stage impeller and a second, axial-flow stage impelle
A rotordynamic pump for delivering continuous flow of fluids, such as blood, is provided. In one embodiment, the pump includes a stator housing having an inlet and an outlet. A rotor hub is disposed within the stator housing having a first, mixed-stage impeller and a second, axial-flow stage impellers. One or more stator vanes and extend radially inwardly from the stator housing. In one particular embodiment, the second stage impeller is disposed nearer to the outlet than to the inlet. The stator vanes may include a first set of stator vanes disposed between the first and second stage impellers, and a second set of stator vanes positioned between the second stage impellers and the outlet.
대표청구항▼
1. An implantable blood pump configured to provide continuous fluid flow, comprising: a stator housing having an inlet, an outlet downstream from the inlet, the stator housing defining a closed fluid pathway extending from the inlet to the outlet;a rotor having a rotor hub disposed within the fluid
1. An implantable blood pump configured to provide continuous fluid flow, comprising: a stator housing having an inlet, an outlet downstream from the inlet, the stator housing defining a closed fluid pathway extending from the inlet to the outlet;a rotor having a rotor hub disposed within the fluid pathway, the rotor hub having a leading portion positioned adjacent the inlet, the leading portion having a diameter increasing with distance in the downstream direction, a trailing portion positioned adjacent the outlet, the trailing portion having a diameter decreasing with distance in the downstream direction, and a cylindrical intermediate portion extending from the leading portion to the trailing portion, the rotor having a mixed-flow first stage positioned at the leading portion comprising at least one first-stage impeller blade coupled with the leading portion, and a single axial-flow second stage positioned on the intermediate portion of the rotor hub in an annulus of the stator housing which surrounds the intermediate portion between the leading portion and the trailing portion, the single axial-flow second stage comprising at least one second-stage impeller blade coupled with the intermediate portion and positioned closer to the outlet than to the inlet, the at least one second-stage impeller blade having an impeller blade tip clearance with the annulus, the impeller blade tip clearance having an axial dimension in an axial direction of the pump; andcomponents associated with the stator housing which, in operation of the pump, are configured to completely magnetically suspend the rotor hub and cause the rotor hub to rotate;at least one stator vane extending radially inward from the stator housing and positioned in the annulus such that a stator vane tip clearance is defined between the at least one stator vane and the rotor hub, the at least one stator vane substantially filling an axial distance between the at least one mixed flow first-stage impeller blade and the at least one second-stage impeller blade, the stator vane tip clearance having an axial dimension in the axial direction of the pump,wherein the pump is configured to increase fluid pressure downstream of the mixed flow first stage to a first pressure level and is configured to increase fluid pressure downstream of the axial-flow second stage to a second pressure level of about 50 mmHg greater than the first pressure level,and the pump is operable at the pump speed of approximately 14,000 rotations per minute (rpm) at a rotor hub diameter of 12 millimeters and the axial dimension of the axial-flow second stage impeller blade tip clearance is shorter than the axial dimension of the stator vane tip clearance. 2. The pump of claim 1, wherein the leading portion and the trailing portion each exhibit substantially conical geometries. 3. The pump of claim 2, wherein the at least one first stage impeller blade comprises a plurality of blades which are curved along a three-dimensional path along the leading portion of the rotor hub. 4. The pump of claim 3, further comprising a shroud connected to the plurality of blades. 5. The pump of claim 1, wherein the at least one second-stage impeller blade comprises a plurality of impeller blades which are curved along a three-dimensional path axially along the body of the rotor hub. 6. The pump of claim 1, wherein the at least one stator vane is integrally formed with the stator housing. 7. The pump of claim 1, wherein the at least one stator vane is formed on a tubular insert disposed within the stator housing. 8. The pump of claim 1, wherein the rotor hub and the stator housing are configured of blood compatible materials. 9. The pump as claimed in claim 1, wherein the stator vane tip clearance between the tip of the at least one stator vane and the intermediate portion of the rotor hub has a dimension from approximately 0.1 millimeters to approximately 0.2 millimeters. 10. The pump as claimed in claim 1, wherein a temperature rise of the pump during operation is minimized. 11. An implantable blood pump configured to provide continuous fluid flow, comprising: a stator housing having an inlet, an outlet downstream from the inlet, the stator housing defining a closed fluid pathway from the inlet to the outlet;a rotor having a rotor hub disposed within the fluid pathway, the rotor hub having a leading portion positioned adjacent the inlet, a trailing portion positioned adjacent the outlet, and a cylindrical intermediate portion extending from the leading portion to the trailing portion, wherein a width of the leading portion increases with distance in the downstream direction and a width of the trailing portion decreases with distance in the downstream direction, the rotor having a mixed-flow first stage positioned at the leading portion comprising at least one mixed flow first-stage impeller blade coupled with the leading portion, and a single axial-flow second stage positioned on the intermediate portion in an annulus of the stator housing which surrounds the intermediate portion between the leading and trailing portions of the rotor hub, the second stage closer to the outlet than to the inlet, the second stage comprising at least one second-stage impeller blade having an impeller blade tip clearance with the annulus, the impeller blade tip clearance having an axial dimension in an axial direction of the pump; andcomponents associated with the stator housing which, in operation of the pump, are configured to completely magnetically suspend the rotor hub and cause the rotor hub to rotate; andat least one stator vane extending radially inward from the stator housing and positioned in the annulus such that a stator vane tip clearance is defined between the at least one stator vane and the rotor hub, the stator vane tip clearance having an axial dimension in the axial direction of the pump, the at least one stator vane substantially filling an axial distance in the annulus not occupied by the at least one second-stage impeller blade,wherein the pump is operable at a pump speed of approximately 14,000 rpm at a rotor hub diameter of 12 millimeters, and the axial dimension of the axial-flow second stage impeller blade tip clearance is shorter than the axial dimension of the stator vane tip clearance. 12. The pump as claimed in claim 11, wherein the pump is configured to increase fluid pressure downstream of the at least one mixed flow first-stage impeller blade to a first pressure level and is configured to increase fluid pressure downstream of the at least one second-stage impeller blade to a second pressure level greater than the first pressure level. 13. An implantable blood pump configured to provide continuous fluid flow, comprising: a stator housing having an inlet, an outlet downstream from the inlet, the stator housing defining a closed fluid pathway extending from the inlet to the outlet;a rotor having a rotor hub disposed within the fluid pathway, the rotor hub having a leading portion positioned adjacent the inlet, the leading portion having a diameter increasing with distance in the downstream direction, a trailing portion positioned adjacent the outlet, the trailing portion having a diameter decreasing with distance in the downstream direction, and having an intermediate portion extending from the leading portion to the trailing portion, the rotor having a mixed-flow first stage positioned at the leading portion comprising at least one first stage impeller blade coupled with the leading portion, and an axial-flow second stage positioned on the intermediate portion of the rotor hub in an annulus of the stator housing which surrounds the intermediate portion of the rotor hub between the leading and trailing portions, the axial-flow second stage comprising at least one second-stage impeller blade coupled with the intermediate portion and having an impeller blade tip clearance with the annulus, the impeller blade tip clearance having an axial dimension in an axial direction of the pump;components associated with the stator housing which, in operation of the pump, are configured to completely magnetically suspend the rotor hub and cause the rotor hub to rotate; andat least one stator vane extending radially inward from the stator housing and positioned in the annulus such that a stator vane tip clearance is defined between the at least one stator vane and the rotor hub, the at least one stator vane substantially filling an axial distance in the annulus not occupied by the at least one second-stage impeller blade, the stator vane tip clearance having an axial dimension in the axial direction of the pump,wherein the pump is operable at a speed of approximately 14,000 rpm and a rotor hub diameter of 12 millimeters, and the axial dimension of the impeller blade tip clearance of the at least one second-stage impeller blade is shorter than the axial dimension of the stator vane tip clearance. 14. The pump as claimed in claim 13, wherein the pump is configured to increase fluid pressure downstream of the at least one mixed flow first-stage impeller blade to a first pressure level and is configured to increase fluid pressure downstream of the at least one second-stage impeller blade to a second pressure level of about 50 mmHg greater than the first pressure level. 15. An implantable blood pump configured to provide continuous fluid flow, comprising: a stator housing having an inlet, an outlet downstream from the inlet, the stator housing defining a closed fluid pathway from the inlet to the outlet;a rotor having a rotor hub disposed within the fluid pathway, the rotor hub having a leading portion positioned adjacent the inlet, a trailing portion positioned adjacent the outlet, and a cylindrical intermediate portion extending from the leading portion to the trailing portion, wherein a width of the leading portion increases with distance in the downstream direction and a width of the trailing portion decreases with distance in the downstream direction, the rotor having a mixed-flow first stage positioned on the leading portion comprising at least one mixed flow first-stage impeller blade coupled with the leading portion, and an axial-flow second stage being the only impeller stage positioned on the intermediate portion, the axial flow second stage positioned at one of: closer to the inlet than to the outlet, or closer to the outlet than the inlet, the second stage comprising at least one second-stage impeller blade having an impeller blade tip clearance with the annulus, the impeller blade tip clearance having an axial dimension in an axial direction of the pump; andcomponents associated with the stator housing which, in operation of the pump, are configured to completely magnetically suspend the rotor hub and cause the rotor hub to rotate; andat least one stator vane extending radially inward from a converging portion of the stator housing surrounding the trailing portion of the rotor hub, the at least one stator vane having a stator vane tip clearance defined between the at least one stator vane and the rotor hub, the stator vane tip clearance having an axial dimension,wherein the pump is operable at a pump speed of approximately 14,000 rpm at a rotor hub diameter of 12 millimeters and the axial dimension of the impeller blade tip clearance of the axial flow second stage is reduced in relation to the axial dimension of the stator vane tip clearance.
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