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A blood clot is directly suctioned through a catheter connected to a vacuum system. Although an increase in catheter bore size significantly enhances aspiration efficiency, this compromises endovascular navigability during manual manipulation. To minimize this trade\u2010off, this paper presents a novel, magnetic aspiration catheter that enables both active steering and distal\u2010end expansion via externally applied magnetic fields. The catheter incorporates dual\u2010axis magnetization. Axial magnetization facilitates directional steering by aligning the catheter tip with the magnetic field; radial magnetization enables dynamic expansion of the cross\u2010sectional area in response to the field strength, thereby improving clot contact and reducing leakage between the catheter and vessel wall. A magnetic mold\u2010based fabrication method is employed to realize such dual\u2010axis magnetization. The magnetically actuated motions of the catheter are theoretically and experimentally validated. Active steering reduces the navigation time by 67.5% (30.3 vs. 93.1\u2009s) and expansion increases the aspiration force by 430% (27 vs. 143\u2009\u00b5N). Catheter efficacy and feasibility in terms of aspiration thrombectomy are demonstrated using 3D vascular phantoms. By enhancing both navigational control and therapeutic performance, this study advances the development of practical robotic systems for rapid and precise stroke treatment.<\/jats:p>","DOI":"10.1002\/aisy.202500834","type":"journal-article","created":{"date-parts":[[2026,7,20]],"date-time":"2026-07-20T14:27:53Z","timestamp":1784557673000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Steerable and Expandable Magnetic Aspiration Catheter for Enhanced Aspiration Thrombectomy"],"prefix":"10.1002","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6682-8845","authenticated-orcid":false,"given":"Hakjoon","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Robotics and Mechatronics Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST)  Daegu Republic of Korea"},{"name":"DGIST\u2010ETH Microrobotics Research Center, DGIST  Daegu Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-1417-0736","authenticated-orcid":false,"given":"Xiao","family":"Dong","sequence":"additional","affiliation":[{"name":"Department of Robotics and Mechatronics Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST)  Daegu Republic of Korea"},{"name":"DGIST\u2010ETH Microrobotics Research Center, DGIST  Daegu Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong\u2010in","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Robotics and Mechatronics Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST)  Daegu Republic of Korea"},{"name":"DGIST\u2010ETH Microrobotics Research Center, DGIST  Daegu Republic of Korea"},{"name":"Department of Biomedical Engineering University of Massachusetts  Amherst Massachusetts USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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