# US 2014/0155683 A1 · Cardiac Pump

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- Number: US 2014/0155683 A1
- Document ID: US20140155683A1
- Status: Published application
- Kind: A1
- Application number: 14/233,703
- Filed: 2012-07-18
- Published: 2014-06-05
- Earliest claimed: 2011-07-18
- Assignees: Calon Cardio Technology Ltd
- Inventors: Graham Foster
- Web page: https://patentgrep.com/patent/US20140155683A1

## CPC

- A61M 60/422: the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
- A61M 60/178: drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
- A61M 60/216: including a rotating member acting on the blood, e.g. impeller
- A61M 60/148: in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
- A61M 60/818: Bearings
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

The cardiac pump, which is suitable for implantation into a ventricle of a human heart, has a primary blood flow path through a housing, a rotatable pump member disposed within the housing for causing blood to flow along the primary flow path, the pump member being rotatably coupled to the housing about an upstream bearing and a downstream bearing. The pump member includes an impeller shroud defining a secondary flow path in fluid communication with the primary flow path. The downstream bearing comprises a rotational bearing member and a stationary bearing seat for the bearing member, there being a circumferential transition between the bearing seat and the bearing member, the circumferential transition being disposed in the secondary flow path and arranged to be washed by blood passing along the secondary flow path.

## Claims

### Claim at position 1

1-7. (canceled)

### Claim 8

A cardiac pump suitable for implantation into a ventricle of a human heart, the pump comprising:
a) a housing comprising an inlet for blood, an outlet for blood and a primary blood flow path which extends between the inlet and the outlet;
b) a rotatable pump member disposed within the housing for causing blood to flow along the primary flow path from the inlet to the outlet, the pump member being rotatably coupled to the housing about an upstream bearing and a downstream bearing, the pump member comprising an impeller which includes an impeller shroud defining a secondary flow path between the pump member and the housing, the secondary flow path comprising an entrance and an exit;
the entrance and exit being in fluid communication with the primary flow path, with the exit upstream in the primary flow path relative to the entrance, such that blood flow along the primary flow path results in reduction of pressure at the exit relative to that at the entrance and flow of blood along said secondary flow path,
wherein the downstream bearing comprises a rotational bearing member and a stationary bearing seat for said bearing member, there being a circumferential transition between the bearing seat and the bearing member, said circumferential transition being disposed in said secondary flow path and arranged to be washed by blood passing along said secondary flow path.

### Claim 9 (depends on 8)

A cardiac pump according to claim 8, wherein the exit includes a plurality of openings permitting blood to return to the primary flow path.

### Claim 10 (depends on 8)

A cardiac pump according to claim 8, where the exit is arranged to direct blood exiting the chamber into the primary blow flow path in the direction of blood flow along the primary blood flow path adjacent said exit.

### Claim 11 (depends on 8)

A cardiac pump according to claim 8, wherein the outlet is disposed downstream of the impeller shroud, such that blood flows through the shroud to the entrance.

### Claim 12 (depends on 8)

A cardiac pump according to claim 8, wherein the housing comprises a cannula section and a pump section including a pumping chamber, the inlet being disposed on the cannula section and the outlet being disposed on the pump chamber.

### Claim 13 (depends on 12)

A cardiac pump according to claim 12, in which the cannula section is arranged to extend from an internal part of the ventricle to straddle the wall of the ventricle.

### Claim 14 (depends on 8)

A cardiac pump according to claim 8, further comprising a rotor and a stator including motor coils for driving the impeller.