Magnetic levitation centrifugal pump
Inventors
Ghelli, Nicola • Fontanili, Paolo • Costa Maianti, Edgardo
Assignees
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Publication Number
US-11732726-B2
Publication Date
2023-08-22
Expiration Date
Abstract
A magnetic levitation centrifugal pump comprises: an internally hollow body, an inlet connector and an outlet connector for blood. The hollow body comprises a lower element and an upper element which are mutually coupled to each other; a rotor element housed inside the hollow body and provided with a portion made of magnetic material, the rotor element being magnetically commanded in rotation about a relative axis, without contact, by a stator element associable with the hollow body. The upper element has a perimeter flange for coupling and a substantially dome-shaped body projecting from the perimeter flange. The outlet connector is associated with the dome-shaped body and is spaced away from the perimeter flange, between the outlet connector and the perimeter flange being defined an air space inside which mutual tightening device/component can be inserted for the tightening of the upper element with the lower element.
Core Innovation
The invention relates to a magnetic levitation centrifugal pump for blood that includes a contactless magnetic rotor housed in an internally hollow body. The internally hollow body comprises a lower element and an upper element coupled to each other, and a rotor element with a portion made of magnetic material is magnetically commanded in rotation about an axis of rotation without contact by a stator element associable with the internally hollow body.
The upper element has a perimeter flange for coupling and at least one substantially dome-shaped body projecting from the perimeter flange. An outlet connector is associated with the substantially dome-shaped body and is spaced away from the perimeter flange, thereby defining an air space between the outlet connector and the perimeter flange for tightening during assembly.
The coupling surface defined by the perimeter flange is substantially flat, and a sealing means is provided comprising an O-ring in a groove. The outlet connector is oriented transversely with respect to the axis of rotation and is inclined with respect to the rotation axis with an inclination of less than 90°.
The rotor includes a multi-blade revolving body with an upward concave, curvilinear contact surface intended to reduce blood damage. Separating the outlet connector from the perimeter flange reduces welding discontinuities and maintains flange contact during welding, thereby reducing risk of blood stagnation cavities/protrusions and contamination from welding dust.
Claims Coverage
The independent claims cover a magnetic levitation centrifugal pump with a lower and upper internally hollow body arrangement, a separated outlet connector that defines an air space, sealing and centering structures, and outlet connector orientation constraints. The inventive features include seven merged features from the claim set.
Magnetic levitation centrifugal blood pump with an internally hollow body
A magnetic levitation centrifugal pump comprising at least one internally hollow body provided with at least one inlet connector and with at least one outlet connector for blood, where the internally hollow body comprises at least one lower element and at least one upper element mutually coupled to each other.
Contactless magnetically commanded rotor element
At least one rotor element housed inside the internally hollow body and provided with at least one portion made of magnetic material, wherein the rotor element is magnetically commanded in rotation about an axis of rotation, without contact, by a stator element associable with the internally hollow body.
Dome-shaped upper element with spaced outlet connector defining an air space
The upper element has at least one perimeter flange for coupling and at least one substantially dome-shaped body projecting from the perimeter flange, wherein the outlet connector is associated with the substantially dome-shaped body and is spaced away from the perimeter flange so that an air space is defined between the outlet connector and the perimeter flange.
Substantially flat coupling surface and O-ring sealing
The perimeter flange defines a coupling surface with the lower element, the coupling surface is substantially flat, and sealing means are placed between the coupling surface and the lower element, wherein the sealing means comprise at least one O-ring facing the internally hollow body in a radially inward direction.
Transverse and inclined outlet connector constraint
The outlet connector is oriented transversely with respect to the axis of rotation and is inclined with respect to the coupling surface and inclined with respect to the axis of rotation with an angle of less than 90°.
Interlocking relief/recess centering means with O-ring downstream arrangement
Upper and lower elements are provided with corresponding centering means adapted to ensure their correct mutual positioning, wherein the centering means comprise at least one relief defined on one of either the coupling surface or the lower element and at least one recess defined on the other, the relief being adapted to be inserted in the recess following coupling, where the relief and recess are adapted to be locked together to define the sealing means, and where the centering means are arranged downstream of the O-ring in a radial direction with respect to the internally hollow body outwards.
Multi-blade revolving blood contact surface
A rotor element includes a revolving body with a plurality of blades and an upward concave, curvilinear contact surface that contacts blood and pushes it from the inlet connector toward the outlet connector.
Overall, the claim set requires a contactless magnetic levitation centrifugal pump for blood with a coupled lower and upper internally hollow body, a substantially dome-shaped upper portion carrying an outlet connector spaced from perimeter flanges to define an air space, substantially flat coupling surfaces, O-ring sealing, and relief/recess centering means. It further constrains the outlet connector to be transverse and inclined with an inclination angle less than 90°, and refines the rotor’s blood-contact region using multi-blade geometry and a concave, substantially curvilinear contact surface.
Stated Advantages
Enables easier welding and improved sealing via a substantially flat coupling surface.
Separating the outlet connector from the flange reduces welding discontinuities and maintains flange contact during welding.
Reduces risk of blood stagnation cavities/protrusions and contamination from welding dust.
Documented Applications
Magnetic levitation centrifugal pumping of blood using a contactless magnetic rotor inside an internally hollow body.
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