# US 12,179,008 B2 · Magnetic coupler for hemostatic rotor sealing

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- Number: US 12,179,008 B2
- Document ID: US12179008B2
- Status: Granted
- Kind: B2
- Application number: 18/376,613
- Filed: 2023-10-04
- Published: 2024-01-25
- Granted: 2024-12-31
- Earliest claimed: 2018-03-09
- Assignees: Boston Scientific Scimed, Inc.
- Applicants: Boston Scientific Scimed, Inc.
- Inventors: Brian Hanson; Steven R. Larsen; Benjamin Breidall; Joseph A. Kronstedt; Paul F. Chouinard
- Web page: https://patentgrep.com/patent/US12179008B2

## CPC

- A61M 60/419: the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets
- A61M 60/13: by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system
- A61M 60/139: inside the aorta, e.g. intra-aortic balloon pumps
- A61M 60/216: including a rotating member acting on the blood, e.g. impeller
- A61M 60/221: the blood flow through the rotating member having both radial and axial components, e.g. mixed flow pumps
- A61M 60/405: the force acting on the blood contacting member being hydraulic or pneumatic
- A61M 60/416: transmitted directly by the motor rotor drive shaft
- A61M 60/825: Contact bearings, e.g. ball-and-cup or pivot bearings
- A61M 60/827: Sealings between moving parts
- 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

Devices and methods for assisting blood flow are provided. The device includes a housing with an inlet and an outlet, and a fluid barrier separating the housing into a first section containing the inlet and outlet, and a second section. The device also includes an impeller shaft coupled to an impeller and a first magnet in the first section of the housing, and a drive shaft coupled to a second magnet in the second section of the housing. The first and second magnets are arranged such that rotation of the drive shaft rotates the second magnet causing rotation of the first magnet, which drives the impeller.

## Claims

### Claim 1

A medical device for placement within a heart of a patient, the medical device comprising:
a housing including an inlet for receiving blood flow and an outlet for delivering blood flow;
a fluid barrier disposed within the housing, the fluid barrier including a round opening, and the fluid barrier being impervious to fluid and separating the housing into a first section containing the inlet and the outlet, and a second section;
an impeller shaft disposed within the first section of the housing;
an impeller disposed within the first section of the housing and coupled to the impeller shaft;
a first magnet disposed in the first section of the housing and coupled to the impeller shaft;
a drive shaft disposed within the second section of the housing;
a second magnet disposed within the second section of the housing, the second magnet being rotatably coupled to and translatable along the drive shaft, the second magnet including a non-round opening; and
a pivot member disposed between the second magnet and the fluid barrier, the pivot member having a non-round proximal protrusion engaging the non-round opening of the second magnet such that rotation of the drive shaft and the second magnet relative to the housing causes rotation of the pivot member relative to the housing, and the pivot member further including a round distal protrusion engaging the round opening of the fluid barrier such that the pivot member is rotatable against the fluid barrier;
wherein rotation of the drive shaft and the second magnet relative to the housing causes the first magnet, the impeller shaft, and the impeller to rotate relative to the housing.

### Claim 2 (depends on 1)

The medical device of claim 1, further comprising a power source operably coupled to the drive shaft.

### Claim 3 (depends on 2)

The medical device of claim 2, wherein the power source is a motor.

### Claim 4 (depends on 1)

The medical device of claim 1, wherein a proximal end of the impeller shaft extends proximal of the first magnet, the proximal end having a first protrusion configured to be received by a first recess in the fluid barrier.

### Claim 5 (depends on 4)

The medical device of claim 4, wherein the impeller shaft includes a disc adjacent the first protrusion, the disc extending perpendicularly from a longitudinal axis of the impeller shaft.

### Claim 6 (depends on 5)

The medical device of claim 5, wherein the disc has two opposing lobes.

### Claim 7 (depends on 1)

The medical device of claim 1, further comprising a bearing assembly supporting and centering a distal end of the impeller shaft, the bearing assembly including a bearing housing fixed to the housing, a spacer slidably disposed within the bearing housing, and a distal bearing fixed within the spacer.

### Claim 8 (depends on 7)

The medical device of claim 7, wherein the bearing assembly further includes a spring member disposed around the spacer.

### Claim 9 (depends on 1)

The medical device of claim 1, wherein the fluid barrier acts as a thrust bearing against which the pivot member is rotatable.