AI Article Synopsis

  • A hybrid magnetic bearing system was developed for a rotary centrifugal blood pump aimed at long-term support for heart failure patients, employing two compact bearings for five degrees-of-freedom control.
  • The system uses permanent magnets for passive radial support and electromagnets for axial stability, with performance analyzed through electromagnetic finite element analysis and a proportional-integral-derivative controller for closed-loop control.
  • The implementation of a force balance algorithm significantly reduced bearing current and power consumption to below 0.5 W across varying thrust loads, with theoretical predictions validated by experimental results.

Article Abstract

A hybrid magnetic bearing system was designed for a rotary centrifugal blood pump being developed to provide long-term circulatory support for heart failure patients. This design consists of two compact bearings to suspend the rotor in five degrees-of-freedom with single axis active control. Permanent magnets are used to provide passive radial support and electromagnets to maintain axial stability of the rotor. Characteristics of the passive radial and active thrust magnetic bearing system were evaluated by the electromagnetic finite element analysis. A proportional-integral-derivative controller with force balance algorithm was implemented for closed loop control of the magnetic thrust bearing. The control position is continuously adjusted based on the electrical energy in the bearing coils, and thus passive magnetic forces carry static thrust loads to minimize the bearing current. Performance of the magnetic bearing system with associated control algorithm was evaluated at different operating conditions. The bearing current was significantly reduced with the force balance control method and the power consumption was below 0.5 W under various thrust loads. The bearing parameters predicted by the analysis were validated by the experimental data.

Download full-text PDF

Source
http://dx.doi.org/10.1097/MAT.0b013e3181a094c8DOI Listing

Publication Analysis

Top Keywords

magnetic bearing
12
bearing system
12
hybrid magnetic
8
rotary centrifugal
8
centrifugal blood
8
blood pump
8
bearing
8
passive radial
8
force balance
8
thrust loads
8

Similar Publications

Identification of Antigens Recognized by Murine Intestinal IgAs by a Gel-Independent Immunoproteomic Approach.

J Proteome Res

January 2025

Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza de Ramón y Cajal s/n, 28040 Madrid, Spain.

As part of the intestinal microbiota, can elicit a humoral response in the gastrointestinal tract (GIT) that is mainly directed toward hyphal antigens. This response has been implicated in controlling the invasive form of the fungus and maintaining the yeast as an innocuous commensal. However, the specific targets of this response are still unknown.

View Article and Find Full Text PDF

Purpose: To clarify the location of the popliteal artery (PA) is relative to the tibial osteotomy plane in patients with medial and lateral unicompartmental knee osteoarthritis (KOA) undergoing UKA.

Methods: Preoperative MRI and postoperative radiographs obtained from 50 patients with unicompartmental KOA who underwent fixed-bearing UKA were analyzed. The amount of tibial resection was determined from the surgical records, and a line was drawn parallel to the tibial posterior tilt angle on the sagittal MR image to create a virtual tibial cut line.

View Article and Find Full Text PDF

A novel method for detecting genetic biomarkers in blood-based liquid biopsies using surface plasmon resonance imaging and magnetic beads shows promise in cancer diagnosis and monitoring.

Talanta

January 2025

Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95122, Catania, Italy; INBB, Istituto Nazionale di Biostrutture e Biosistemi, Viale delle Medaglie d'Oro, 305, 00136, Roma, Italy. Electronic address:

Directly detecting biomarkers in liquid biopsy for diagnosis and personalized treatment plays a crucial role in managing cancer relapse and increasing survival rates. Typically, the standard analysis of circulating tumour DNA requires lengthy isolation, extraction, and amplification steps, leading to sample contamination, longer turnaround time and higher assay costs. Surface plasmon resonance is an emerging and promising technology for rapid and real-time dynamic biomarker monitoring in liquid biopsy.

View Article and Find Full Text PDF

In this study, the AlFeO@n-Pr@Et-SOH heterogeneous catalyst was successfully synthesized and utilized to produce biodiesel from oleic acid through an esterification process and to oxidize sulfides. To examine the physicochemical characteristics of the AlFeO@n-Pr@Et-SOH nanomaterial, a variety of advanced techniques were employed, including Fourier Transform infrared spectroscopy (FT-IR), Field emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray spectroscopy (EDX), Vibrating sample magnetometer (VSM), Elemental Mapping, Transmission electron microscopy (TEM), Inductively coupled plasma (ICP), and X-ray diffraction (XRD). The AlFeO@n-Pr@Et-SOH materials demonstrated excellent performance in both the esterification of oleic acid and the oxidation of sulfides.

View Article and Find Full Text PDF

Objective: The purpose of this case study was to report the management of a patient with posterior tibialis tendon injury concurrent with gender-affirming hormone therapy (GAHT).

Clinical Features: A 31-year-old transgender male presented to a chiropractic clinic with spontaneous, right medial foot pain following running that day. Medical history revealed bilateral congenital pes planus and intramuscular administration of testosterone for 8 years.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!