# US 11,298,523 B2 · Impeller housing

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- Number: US 11,298,523 B2
- Document ID: US11298523B2
- Status: Granted
- Kind: B2
- Application number: 16/810,172
- Filed: 2020-03-05
- Published: 2020-07-30
- Granted: 2022-04-12
- Earliest claimed: 2019-01-24
- Assignees: Magenta Medical Ltd.
- Applicants: Magenta Medical Ltd.
- Inventors: Yosi Tuval; Zev Sohn; Ehud Schwammenthal; Gad Lubinsky; Victor Troshin; Shaul Mustacchi; Yinnon Elisha; Yuri Sudin; Hagit Zemer Harel; Avi Rozenfeld
- Web page: https://patentgrep.com/patent/US11298523B2

## CPC

- A61M 60/81: Pump housings
- A61M 60/126: implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M 60/13: by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system
- A61M 60/135: inside a blood vessel, e.g. using grafting
- A61M 60/139: inside the aorta, e.g. intra-aortic balloon pumps
- A61M 60/148: in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
- A61M 60/165: implantable in, on, or around the heart
- A61M 60/174: discharging the blood to the ventricle or arterial system via a cannula internal to the ventricle or arterial system
- A61M 60/216: including a rotating member acting on the blood, e.g. impeller
- A61M 60/237: the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
- A61M 60/414: transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter
- A61M 60/531: using blood pressure data, e.g. from blood pressure sensors
- A61M 60/808: specially adapted for deformable impellers, e.g. expandable impellers
- A61M 60/812: Vanes or blades, e.g. static flow guides
- A61M 60/816: Sensors arranged on or in the housing, e.g. ultrasonic flow sensors
- A61M 60/818: Bearings
- A61M 60/825: Contact bearings, e.g. ball-and-cup or pivot bearings
- A61M 60/829: having a purge fluid supply
- A61M 60/857: Implantable blood tubes
- A61M 60/865: Devices for guiding or inserting pumps or pumping devices into the patient's body
- A61M 60/894: Passive valves, i.e. valves actuated by the blood
- A61M 60/122: Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M 60/205: Non-positive displacement blood pumps
- 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 60/422: the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
- A61M 60/804: Impellers
- A61M 2205/0216: Materials providing elastic properties, e.g. for facilitating deformation and avoid breaking
- 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

Apparatus and methods are described including manufacturing a housing for an impeller of a blood pump by placing an inner lining around a mandrel, placing a cylindrical portion of a frame around the inner lining, and placing a distal portion of an elongate tube around a portion of the frame. While the distal portion of the elongate tube is disposed around the portion of the frame, the inner lining, the frame, and the distal portion of the elongate tube are heated, via the mandrel, and pressure is applied from outside the distal portion of the elongate tube, such as to cause the distal portion of the elongate tube to conform with a structure of the struts of the frame, and to cause the inner lining and the distal portion of the elongate tube to become coupled to the frame. Other applications are also described.

## Claims

### Claim 1

A method, comprising:
manufacturing a housing for an impeller of a blood pump by:
placing an inner lining around a mandrel;
placing a cylindrical portion of a frame around the inner lining, the cylindrical portion of the frame including struts that define a generally cylindrical shape;
placing a distal portion of an elongate tube around at least a portion of the frame, the elongate tube including a proximal portion that defines at least one blood outlet opening;
while the distal portion of the elongate tube is disposed around at least the portion of the frame, heating the inner lining, the frame and the distal portion of the elongate tube, via the mandrel; and
while heating the inner lining, the frame, and the distal portion of the elongate tube, applying pressure from outside the distal portion of the elongate tube, such as to cause the distal portion of the elongate tube to conform with a structure of the struts of the frame, and such as to cause the inner lining and the distal portion of the elongate tube to become coupled to the frame.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising, subsequent to causing the inner lining and the distal portion of the elongate tube to become coupled to the frame, shaping a distal end of the frame to define a widened inlet.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising, subsequent to causing the inner lining and the distal portion of the elongate tube to become coupled to the frame, shaping a portion of the frame to form a converging region, such that the frame defines a narrowing in a vicinity of a location within the frame that is configured to house the impeller.

### Claim 4 (depends on 1)

The method according to claim 1, wherein:
the inner lining and the elongate tube include an inner lining and elongate tube that are made from different materials from each other, and a thermoforming temperature of a material from which the inner lining is made is higher than a thermoforming temperature of a material from which the elongate tube is made, and
heating the inner lining, the frame, and the distal portion of the elongate tube comprises heating the inner lining, the frame, and the distal portion of the elongate tube to a temperature that is above the thermoforming temperature of the material from which the elongate tube is made and below the thermoforming temperature of the material from which the inner lining is made.

### Claim 5 (depends on 1)

The method according to claim 1, wherein applying pressure from outside the distal portion of the elongate tube comprises applying pressure from outside the distal portion of the elongate tube using an outer tube that is made of silicone.

### Claim 6 (depends on 1)

The method according to claim 1, wherein placing the distal portion of the elongate tube around at least a portion of the frame comprises placing the distal portion of the elongate tube around the entire cylindrical portion of the frame, such the distal portion of the elongate tube overlaps with the entire inner lining.

### Claim 7 (depends on 1)

The method according to claim 1, wherein applying pressure from outside the distal portion of the elongate tube, such as to cause the inner lining and the distal portion of the elongate tube to become coupled to the frame comprises coupling the inner lining to an inner surface of the cylindrical portion of the frame, such that the inner lining forms a substantially cylindrical tube.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the struts within the cylindrical portion of the frame are shaped to define cells, and a width of each of the cells as measured around a circumference of the cylindrical portion is less than 2 mm.

### Claim 9 (depends on 1)

The method according to claim 1, wherein placing the distal portion of the elongate tube around at least a portion of the frame comprises placing the distal portion of the elongate tube around only a portion of the cylindrical portion of the frame, such the distal portion of the elongate tube does not overlap with the entire inner lining.

### Claim 10 (depends on 9)

The method according to claim 9, wherein placing the distal portion of the elongate tube around only a portion of the cylindrical portion of the frame comprises preventing radial expansion of the portion of the cylindrical portion of the frame around which the distal portion of the elongate tube is placed, thereby causing the portion of the cylindrical portion of the frame around which the distal portion of the elongate tube is placed to be narrower than a portion of the cylindrical portion of the frame around which the elongate tube is not placed.