# US 2014/0194779 A1 · Coronary guidewire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194779 A1 - Document ID: US20140194779A1 - Status: Published application - Kind: A1 - Application number: 14/152,010 - Filed: 2014-01-10 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Yokowo Co., Ltd.; The Cleveland Clinic Foundation - Applicants: Yokowo Co., Ltd.; The Cleveland Clinic Foundation - Inventors: Pat Whitlow; Naoki Ooka; Koichi Sakai - Web page: https://patentgrep.com/patent/US20140194779A1 ## CPC - A61M 25/09: Guide wires - A61M 2025/09083: {having a coil around a core} - A61M 2025/09175: {having specific characteristics at the distal tip} - 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 coronary guidewire (10) includes a flexible elongated core (20) and a coil (40) comprising a plurality of helical coil turns wound around a distal end portion of the core. The coil (40) has a proximal end (50) and an opposite distal end (52). A weld joint (62) connects the distal end (52) of the coil to the core (20) and defines a distal tip (80) of the guidewire. The distal end (52) can have a flexible bend radius as small as 0.2 mm-0.6 mm. ## Claims ### Claim 1 A coronary guidewire, comprising: a flexible elongated core; a coil comprising a plurality of helical coil turns wound around a distal end portion of the core, the coil having a proximal end and an opposite distal end; and a weld joint that connects the distal end of the coil to the core and defines a distal tip of the guidewire. ### Claim 2 (depends on 1) The guidewire recited in claim 1, further comprising a solder joint that connects the proximal end of the coil to the core ### Claim 3 (depends on 2) The coronary guidewire recited in claim 2, further comprising a second solder joint that connects the coil to the core at a location between the welded distal end of the coil and the soldered proximal end of the coil. ### Claim 4 (depends on 1) The guidewire recited in claim 1, wherein the coil comprises a proximal portion including the proximal end of the coil and a distal portion including the distal end of the coil, the proximal portion of the coil being constructed of stainless steel, the distal portion of the coil being constructed of a platinum alloy. ### Claim 5 (depends on 1) The guidewire recited in claim 1, wherein the distal tip has a rounded semispherical surface having a diameter about equal to an outside diameter of the coil. ### Claim 6 (depends on 1) The guidewire recited in claim 1, wherein the distal end portion of the core comprises a bend adjacent the distal tip, the coil following the bend such that adjacent coil turns along the bend are spaced from each other, the spaced coil turns being movable toward each other to permit the bend in the core to straighten. ### Claim 7 (depends on 1) The guidewire recited in claim 1, wherein the distal end portion of the core comprises a flexible bend adjacent the distal tip, the flexible bend having an inner bend radius of 0.10 mm-1.70 mm, an outer bend radius of 0.40 mm-2.10 mm, and a bend angle of 24-32 degrees. ### Claim 8 (depends on 1) The guidewire recited in claim 1, wherein the weld joint comprises a tungsten inert gas welded joint. ### Claim 9 (depends on 1) The guidewire recited in claim 1, wherein the coil has at least one portion bonded to the core at a location spaced proximally from the distal tip. ### Claim 10 (depends on 9) The guidewire recited in claim 9, wherein the at least one portion bonded to the core comprises a soldering of the at least one portion to the core. ### Claim 11 A coronary guidewire, comprising: a flexible elongated core; a coil comprising a plurality of helical coil turns wound around a distal end portion of the core, the coil having a proximal end and an opposite distal end, wherein the distal end portion of the core comprises a flexible bend adjacent the distal tip, the flexible bend having an inner bend radius of 0.10 mm-1.70 mm, an outer bend radius of 0.40 mm-2.10 mm, and a bend angle of 24-32 degrees. ### Claim 12 (depends on 11) The guidewire recited in claim 11, wherein the coil follows the bend such that adjacent coil turns along the bend are spaced from each other, the spaced coil turns being movable toward each other to permit the bend in the core to straighten. ### Claim 13 (depends on 11) The guidewire recited in claim 11, further comprising a weld joint that connects the distal end of the coil to the core and defines a distal tip of the guidewire. ### Claim 14 (depends on 13) The guidewire recited in claim 13, further comprising a solder joint that connects the proximal end of the coil to the core. ### Claim 15 (depends on 14) The coronary guidewire recited in claim 14, further comprising a second solder joint that connects the coil to the core at a location between the welded distal end of the coil and the soldered proximal end of the coil. ### Claim 16 (depends on 13) The guidewire recited in claim 13, wherein the coil comprises a proximal portion including the proximal end of the coil and a distal portion including the distal end of the coil, the proximal portion of the coil being constructed of stainless steel, the distal portion of the coil being constructed of a platinum alloy. ### Claim 17 (depends on 13) The guidewire recited in claim 13, wherein the distal tip has a rounded semispherical surface having a diameter about equal to an outside diameter of the coil. ### Claim 18 (depends on 13) The guidewire recited in claim 13, wherein the weld joint comprises a tungsten inert gas welded joint. ### Claim 19 (depends on 13) The guidewire recited in claim 13, wherein the coil has at least one portion bonded to the core at a location spaced proximally from the distal tip. ### Claim 20 (depends on 19) The guidewire recited in claim 19, wherein the at least one portion bonded to the core comprises a soldering of the at least one portion to the core.