# US 2014/0155931 A1 · System and method for treating ischemic stroke > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0155931 A1 - Document ID: US20140155931A1 - Status: Published application - Kind: A1 - Application number: 13/889,201 - Filed: 2013-05-07 - Published: 2014-06-05 - Earliest claimed: 2004-09-10 - Assignees: Penumbra, Inc. - Inventors: Arani Bose; Vikas Gupta; Sean Donahue; Delilah Hui - Web page: https://patentgrep.com/patent/US20140155931A1 ## CPC - A61B 17/221: Gripping devices in the form of loops or baskets {for gripping calculi or similar types of obstructions (surgical snare instruments A61B17/32056)} - A61B 17/22: Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for - A61B 2017/22044: {with a pointed tip} - A61B 2017/2215: {having an open distal end} - A61B 2217/005: with suction drainage system - A61F 2/013: {Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting} - A61M 2025/1052: {for temporarily occluding a vessel for isolating a sector} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) - 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 A thromboembolic removal system for treating ischemic stroke, including a guide and occlusion catheter, a delivery and aspiration catheter, an aspiration pump, a thromboembolic receiver, and a thromboembolic separator. ## Claims ### Claim 1 (canceled) ### Claim 2 A method for removing a thromboembolism from a blood vessel, said method comprising: providing a device comprising a catheter having an axial lumen, a pusher element slidably disposed in the lumen of the catheter, and a thromboembolic receiver on a distal end of the pusher element, the receiver formed of a plurality of structural members arranged to form a sleeve having a central lumen, a first plurality of structural members comprising longitudinally extending struts, a second plurality of the structural members comprising v-shaped engaging elements, and a third set of structural members comprising a plurality of axially spaced-apart circumferential rings attached to the longitudinal struts, each of said v-shaped engaging elements being disposed between adjacent ones of the longitudinal struts and including a first leg extending into the central lumen from a first longitudinal strut and a second leg extending into the central lumen from a second, adjacent longitudinal strut, said first and second legs attached to one another within the central lumen to define a plurality of longitudinally oriented apexes extending in to the central lumen, wherein at least a distal row and a proximal row of the v-shaped engaging elements are disposed between a distal circumferential ring and a proximal circumferential ring and each apex is unattached to any other structure within the central lumen; providing at least one elongate element; passing the at least one elongate element through the thromboembolic receiver in order to engage one or more engagement elements whereby said engagement elements are prevented from extending medially into the lumen of the thromboembolic receiver; positioning a distal end of the catheter adjacent to the thromboembolism in the blood vessel; withdrawing said one or more elongate elements until the engagement elements are released from the constraint of the elongate element; retracting the catheter relative to the pusher element to release the thromboembolic receiver wherein the open end of the expanded cylindrical thromboembolic receiver engages the thromboembolism; and retracting the pusher element to remove the thromboembolism from the blood vessel. ### Claim 3 (depends on 2) The method according to claim 2, wherein the method also comprises the step of advancing the thromboembolic receiver over the thromboembolism before the step of withdrawing said one or more elongate elements. ### Claim 4 (depends on 2) The method according to claim 2, wherein the method also comprises the additional step of withdrawing the receiver from the blood vessel with the thromboembolism engaged by the thromboembolic receiver. ### Claim 5 (depends on 2) The method according to claim 2, wherein prior to the step of providing a thromboembolic receiver on a distal end of the pusher element that is slidably disposed in the lumen of the catheter, the method also comprises the steps of: providing the thromboembolic receiver comprising the elements set forth in claim 2; compressing the thromboembolic receiver to a collapsed configuration; and positioning the receiver in the collapsed configuration within the catheter. ### Claim 6 (depends on 2) The method according to claim 2, wherein the step of positioning the catheter within the blood vessel adjacent the thromboembolism further comprises the step of positioning the catheter proximal of the thromboembolism. ### Claim 7 (depends on 5) The method according to claim 5, wherein the method further comprises the step of releasing the receiver from constraint so that the receiver expands to a cylindrical shape with a fully open end. ### Claim 8 (depends on 2) The method according to claim 2, wherein the method further comprises the step of extending the receiver distally from the catheter. ### Claim 9 (depends on 8) The method according to claim 8, wherein the method further comprises the step of sliding a distal portion of the catheter against a proximal portion of the receiver to cause the receiver to exert pressure against the thromboembolism in a radially inward direction. ### Claim 10 (depends on 2) The method according to claim 2, wherein at least one of the circumferential rings of the thromboembolic receiver further comprises one or more undulations. ### Claim 11 (depends on 10) The method according to claim 10, wherein the one or more undulations resemble a letter “M” shape. ### Claim 12 (depends on 2) The method according to claim 2, wherein at least one of the longitudinally extending struts comprises one or more flex regions. ### Claim 13 (depends on 12) The method according to claim 12, wherein the one or more flex regions resemble a letter “S” shape.