# US 8,109,888 B2 · Medical guide wire

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- Number: US 8,109,888 B2
- Document ID: US8109888B2
- Status: Granted
- Kind: B2
- Application number: 12/617,456
- Filed: 2009-11-12
- Published: 2010-03-04
- Granted: 2012-02-07
- Earliest claimed: 2006-06-02
- Assignees: FMD Co., Ltd.
- Inventors: Tsuyoshi Terashi; Seiji Shimura
- Web page: https://patentgrep.com/patent/US8109888B2

## 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; and
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;
wherein said helical coil comprises:
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; and
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 having a constant diameter with strands tightly wound in a range from said coil distal end to said middle connector;
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, and t is a filament diameter of said coil filament; and
one end of said diameter decreasing coil portion nearer to said equiradial coil portion is disposed at said middle connector.

### Claim 2 (depends on 1)

The medical guide wire of claim 1, wherein the middle connector is positioned at the proximal end from a point defined between the diameter decreasing coil portion and the equiradial coil portion.

### Claim 3 (depends on 1)

The medical guide wire of claim 1, wherein a length ratio L1/L2 of the helical coil is equal to or more than 1, where L1 is a length of the diameter decreasing coil portion, and L2 is a length of the equiradial coil portion extending to the middle connector.

### Claim 4 (depends on 1)

The medical guide wire of claim 1, wherein the diameter decreasing coil portion has a diameter decreasing in a range extending to the guide wire tip.