[Continued on next page] (57) Abstract: An aspiration catheter system (10) includes an outer catheter (12) and an inner catheter (14) configured to be positioned within the outer catheter lumen (16) and an alignment element (26). The inner catheter (14) defines an inner catheter lumen (20), an inner catheter distal opening (22) and a plurality of sidewall openings (24A,B) proximal to the inner catheter distal opening (22). The alignment element (26) is configured to indicate a predetermined position of the inner catheter (14) relative to the outer catheter (12) when the inner catheter (14) is received within an outer catheter distal opening (18). When the inner catheter (14) is at the predetermined position, at least one sidewall opening of the plurality of sidewall openings (24A,B) remains positioned within the outer catheter lumen (16) and at least one other sidewall opening of the plurality of sidewall openings (24A,B) is positioned distal to the outer catheter distal opening (18). (54) Title: ASPIRATION CATHETER SYSTEM (81) Designated States (unless otherwise indicated, for every kind of national protection av ailable) . AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, WS, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available) . ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, Cl, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). (74) Agent: STEINBRONN, Joseph R.; Shumaker & Sieffert P.A., 1625 Radio Drive, Suite 100, Woodbury, Minnesota 55 125 (US). (72) Inventors: JALGAONKAR, Ujwal; 15 Hampshire Street, Mansfield, Massachusetts 02048 (US). BON, Edwin; 15 Hampshire Street, Mansfield, Massachusetts 02048 (US). SKUJINS, Peter; 15 Hampshire Street, Mansfield, Massa‹ chusetts 02048 (US). MINTZ, Eric; 15 Hampshire Street, Mansfield, Massachusetts 02048 (US). (71) Applicant: COVIDIEN LP [US/US]; 15 Hampshire Street, Mansfield, Massachusetts 02048 (US). (30) Priority Data: 16/381,642 11 April 2019 ( 11.04.2019) US English English 24 March 2020 (24.03.2020) PCT/US2020/024480 (51) International Patent Classification: A61M 25/00 (2006.01) A61M 25/01 (2006.01) (21) International Application Number: (22) International Filing Date: (25) Filing Language: (26) Publication Language: