# US 7,637,874 B2 · Medical guide wire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,637,874 B2 - Document ID: US7637874B2 - Status: Granted - Kind: B2 - Application number: 11/756,671 - Filed: 2007-06-01 - Published: 2007-12-06 - Granted: 2009-12-29 - Earliest claimed: 2006-06-02 - Assignees: FMD Co., Ltd. - Inventors: Tsuyoshi Terashi; Seiji Shimura - Web page: https://patentgrep.com/patent/US7637874B2 ## 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 medical guide wire includes a flexible long core. A core elongated component is disposed to extend forwards from the core, and has a tapered shape. A helical coil is disposed about the core elongated component, secured by attachment of a coil distal end and a coil proximal end to the core elongated component. The helical coil includes an equiradial coil portion having the coil proximal end, disposed at a portion of the core elongated component on a side of the core. A diameter decreasing coil portion has the coil distal end, extends forwards from the equiradial coil portion, has a decreasing diameter, and has a length 25 mm or more. A diameter ratio D1/D2 of the diameter decreasing coil portion is 1.22-2.31, where D1 is a proximal end diameter of the diameter decreasing coil portion, and D2 is a distal end diameter of the diameter decreasing coil portion. ## Claims ### Claim 1 A medical guide wire comprising: a flexible long core; a core elongated component, disposed to extend forwards from an end of said core, having a tapered shape; a helical coil, disposed about said core elongated component, secured by attachment of a coil distal end and a coil proximal end to said core elongated component; said helical coil including: an equiradial coil portion, having said coil proximal end, disposed at a portion of said core elongated component on a side of said core; a diameter decreasing coil portion, having said coil distal end, disposed to extend forwards from said equiradial coil portion, having a decreasing diameter, and having a length equal to or more than 25 mm; a middle connector, disposed at a distance equal to or less than 50 mm from said coil distal end, for attaching said helical coil to said core elongated component; wherein said helical coil has a coil filament with strands tightly wound in a range from said coil distal end to said middle connector, and in the tightly wound state, all strands of the coil filament are in complete contact, or there is a space between the strands equal to or less than 9% relative to a filament diameter t of the coil filament; a diameter ratio D1/D2 of said diameter decreasing coil portion is equal to or more than 1.22 and equal to or less than 2.31, where D1 is a diameter of said diameter decreasing coil portion on a side of said coil proximal end, and D2 is a diameter of said diameter decreasing coil portion on a side of said coil distal end; said core elongated component and said helical coil satisfy a condition of d2≧t, where d2 is a diameter of a distal end of said core elongated component; wherein said middle connector is positioned on a proximal side from a point defined between said diameter decreasing coil portion and said equiradial coil portion; a first length ratio L1/L2 of said helical coil is equal to or more than 1, where L1 is a length of said diameter decreasing coil portion, and L2 is a length of said equiradial coil portion extending to said middle connector. ### Claim 2 (depends on 1) A medical guide wire as defined in claim 1, further comprising a guide wire tip, positioned at a distal end, and having one portion of said core elongated component and said coil distal end of said helical coil attached to said core elongated component. ### Claim 3 (depends on 2) A medical guide wire as defined in claim 2, wherein one end of said diameter decreasing coil portion nearer to said equiradial coil portion is disposed at said middle connector. ### Claim 4 (depends on 2) A medical guide wire as defined in claim 2, wherein said helical coil further includes an equiradial coil end, disposed to extend forwards from said diameter decreasing coil portion, for constituting said guide wire tip; a second length ratio L1/L3 of said helical coil is equal to or more than 3.1 and equal to or less than 24, where L1 is a length of said diameter decreasing coil portion, and L3 is a length of said equiradial coil end. ### Claim 5 (depends on 4) A medical guide wire as defined in claim 4, wherein said second length ratio L1/L3 of said helical coil is equal to or more than 3.1 and equal to or less than 7.3. ### Claim 6 (depends on 2) A medical guide wire as defined in claim 2, wherein said diameter D1 is equal to or less than 0.360 mm in a range from said guide wire tip to said middle connector; said diameter ratio D1/D2 is equal to or more than 1.22 and equal to or less than 1.85. ### Claim 7 (depends on 6) A medical guide wire as defined in claim 6, wherein in said range from said guide wire tip to said middle connector, said helical coil and said core elongated component satisfy conditions of: t≦d2≦(D2−2×t) t