US20160074630A1 - Guidewire - Google Patents
Guidewire Download PDFInfo
- Publication number
- US20160074630A1 US20160074630A1 US14/739,349 US201514739349A US2016074630A1 US 20160074630 A1 US20160074630 A1 US 20160074630A1 US 201514739349 A US201514739349 A US 201514739349A US 2016074630 A1 US2016074630 A1 US 2016074630A1
- Authority
- US
- United States
- Prior art keywords
- brazing member
- brazing
- guidewire
- distal
- core shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/09—Guide wires
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/09—Guide wires
- A61M2025/09058—Basic structures of guide wires
- A61M2025/09083—Basic structures of guide wires having a coil around a core
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/09—Guide wires
- A61M2025/09133—Guide wires having specific material compositions or coatings; Materials with specific mechanical behaviours, e.g. stiffness, strength to transmit torque
Abstract
A guidewire has a distal-most end portion that retains its desired shape. The guidewire includes a first brazing member joining a distal end of a core shaft to a distal end of an outer coil, and a second brazing member provided adjacent to and on a proximal side of the first brazing member. The melting point of the first brazing member is higher than the melting point of the second brazing member. As a result, deformation of the first brazing member due to a heat produced during formation of the second brazing member is prevented or minimized.
Description
- This application claims priority to Japanese Application No. 2014-187257 filed on Sep. 16, 2014, the content of which is incorporated by reference herein in its entirety.
- The disclosed embodiments relate to a guidewire to be inserted into a lumen such as blood vessels.
- Guidewires for use at the time of inserting a catheter into a blood vessel are known. Insertion of the catheter is conducted by inserting the guidewire into a blood vessel first and then advancing the catheter over the guidewire. The guidewire thus is used as a guide to introduce the catheter to or into a lesion.
- A guidewire used in such applications generally comprises a core shaft and a coil surrounding an outer periphery of the core shaft (a so-called coiled guidewire). In the coiled guidewire, a distal end of the core shaft and a distal end of the coil are joined to each other with a brazing material and, as a result, a distal-end brazing member is formed.
- Because of, for example, reasons related to procedures when the guidewire is assembled, the distal-end brazing member is sometimes formed to include different portions, namely a distal-most end portion and a contiguous portion (formed by soldering) that is provided adjacent to and on a proximal side of the distal-most end portion (see Japanese Patent Application Publication No. 2014-136047 (JP-A-2014-136047), for example).
- However, such a conventional guidewire has a problem in that the distal-most end portion may be deformed due to a heat produced during soldering. Performance of the guidewire (passability in a lesion, for example) is influenced significantly by a shape of the distal-most end portion. Therefore, even when the distal-end brazing member of a guidewire is formed to include different portions, namely the distal-most end portion and the contiguous portion (formed by soldering) that is provided adjacent to and on the proximal side of the distal-most end portion, the distal-most end portion is required to retain its desired shape.
- The disclosed embodiments have been devised to address such a problem in conventional techniques. An object of embodiments is to provide a guidewire in which, even though a distal-end brazing member of the guidewire is formed to include different portions, namely a first brazing member being provided at a distal-most end of the guidewire and a second brazing member being provided adjacent to the first brazing member, the first brazing member of the guidewire retains its desired shape reliably.
- In order to achieve the above and/or other objects, a guidewire of embodiments adopts the following configuration. The guidewire includes:
- a core shaft,
- an outer coil surrounding an outer periphery of the core shaft,
- a first brazing member that joins a distal end of the core shaft to a distal end of the outer coil, and
- a second brazing member provided adjacent to and on a proximal side of the first brazing member. In addition, a melting point of the first brazing member is higher than a melting point of the second brazing member.
- In the guidewire of embodiments, because the melting point of the first brazing member is higher than the melting point of the second brazing member that is adjacent to and on the proximal side of the first brazing member, deformation of the shape (hemispherical or arrowhead-like, for example) of the first brazing member due to a heat produced during formation of the second brazing member is prevented or minimized. Therefore, even when the distal-end brazing member of the guidewire is formed to include different portions, namely the first brazing member and the second brazing member, because of reasons related to procedures in assembling the guidewire, for example, the first brazing member at the distal-most end retains its desired shape reliably.
- The guidewire may further include an inner coil provided between the outer coil and the core shaft, and the second brazing member may be provided between the outer coil and the inner coil but is not provided between the inner coil and the core shaft.
- In the present guidewire, because the melting point of the first brazing member is higher than the melting point of the second brazing member, the first brazing member at the distal-most end retains its desired shape reliably.
- In a guidewire having outer and inner coils, the second brazing member is thus provided between the outer coil and the inner coil but is not provided between the inner coil and the core shaft, and, as a result, an amount of a brazing material used for forming the second brazing member is reduced. For this reason, along with the relationship that the melting point of the first brazing member is higher than the melting point of the second brazing member, deformation of the first brazing member due to the heat produced during formation of the second brazing member is prevented or minimized reliably.
- In the present guidewire, the first brazing member may be formed of a brazing material containing gold, silver and tin.
- The brazing material containing gold, silver and tin has a melting point higher than a melting point of a gold-tin brazing material or a silver-tin brazing material that is commonly used in a guidewire. Therefore, by forming the first brazing member with the brazing material containing gold, silver and tin, deformation of the first brazing member due to the heat produced during formation of the second brazing member (formed of a gold-tin brazing material or a silver-tin brazing material) is prevented or minimized more reliably.
- The present guidewire may include a curved part at a distal part of the guidewire, and the second brazing member may be provided in the curved part.
- In such a guidewire, the presence of the second brazing member in the curved part enables retention of the curved shape of the guidewire. In addition, even though the second brazing member is provided in order to retain the curved shape of the guidewire, the first brazing member still retains its desired shape because the melting point of the first brazing member is higher than the melting point of the second brazing member. Thus, the guidewire simultaneously retains the desired curved shape of the guidewire and the desired shape of the first brazing member at the distal-most end.
-
FIG. 1 is an explanatory view of a configuration of a guidewire according to the disclosed embodiments. -
FIG. 2 is an explanatory view of a structure of a distal part of the guidewire according to theFIG. 1 embodiment. -
FIG. 3 is an explanatory view of a structure of a distal part of a guidewire according to the disclosed embodiments. -
FIG. 4 is an explanatory view of a structure of a distal part of a guidewire according to the disclosed embodiments. - Various embodiments of a guidewire according to aspects of the present invention will be explained below.
-
FIG. 1 is an explanatory view of a configuration of aguidewire 10 according to an embodiment of the present invention. Theguidewire 10 includes acore shaft 11 and anouter coil 12 surrounding an outer periphery of thecore shaft 11. Thecore shaft 11 and theouter coil 12 are joined to each other with a brazing material. In this embodiment, a distal end of thecore shaft 11 and a distal end of theouter coil 12 are connected to each other with a distal-end brazingmember 13, and a middle part of thecore shaft 11 and a proximal end of theouter coil 12 are connected to each other with a proximal-end brazingmember 14. -
FIG. 2 is an explanatory view of a structure of a distal part of theguidewire 10 ofFIG. 1 . As shown inFIG. 2 , in theguidewire 10 of this embodiment, the distal-end brazingmember 13 for joining the distal end of thecore shaft 11 to the distal end of theouter coil 12 consists of two portions. The distal-end brazingmember 13 consists of a first brazing member 13 a located at a distal-most end of theguidewire 10 and a second brazing member 13 b located adjacent to and on a proximal side of the first brazing member 13 a. - In the
guidewire 10, the distal end of thecore shaft 11 and the distal end of theouter coil 12 are brazed to each other first, and then, after the brazing material solidifies, the brazing member is processed so as to form the first brazing member 13 a that is pointed toward the distal side (an arrowhead-like shape). Subsequently, a brazing material is applied to an area adjacent to and on the proximal side of the first brazing member 13 a to form the second brazing member 13 b. - In the
guidewire 10, a melting point of a brazing material A forming the first brazing member 13 a is higher than a melting point of a brazing material B forming the second brazing member 13 b. Examples of combinations of the brazing material A and the brazing material B include the following combinations. - Brazing material A: a brazing material containing gold, silver and tin, and
- Brazing material B: a gold-tin brazing material
- Brazing material A: a brazing material containing gold, silver and tin, and
- Brazing material B: a silver-tin brazing material
- Brazing material A: a gold-tin brazing material, and
- Brazing material B: a silver-tin brazing material
- In the
guidewire 10 of this embodiment, the brazing material A used for forming the first brazing member 13 a is a brazing material containing gold, silver and tin, and the brazing material B used for forming the second brazing member 13 b is a gold-tin brazing material. - In the
guidewire 10, because the melting point of the first brazing member 13 a is higher than the melting point of the second brazing member 13 b adjacent to the first brazing member 13 a, deformation of the first brazing member 13 a due to the heat produced during formation of the second brazing member 13 b is prevented. - Performance of the guidewire (passability in a lesion, for example) is influenced significantly by the shape of the distal-most end portion of the
guidewire 10. In this regard, theguidewire 10 is excellent in that the first brazing member 13 a that has significant effect on the performance of theguidewire 10 retains its desired shape reliably even when the distal-end brazing member 13 is formed to include different parts, namely the first brazing member 13 a and the second brazing member 13 b, for reasons related to procedures in assembling, for example. - In addition, in the
guidewire 10, the brazing material A used for forming the first brazing member 13 a is the brazing material containing gold, silver and tin. The brazing material containing gold, silver and tin has a melting point (about 400° C.) higher than the melting point of a gold-tin brazing material or a silver-tin brazing material (200 to 300° C.) that is commonly used in a guidewire. Therefore, by forming the first brazing member 13 a with the brazing material containing gold, silver and tin, deformation of the first brazing member 13 a due to the heat produced during formation of the second brazing member 13 b is prevented more reliably. -
FIG. 3 is an explanatory view of a structure of a distal part of aguidewire 20 according to a modification. Theguidewire 20 of the modification is different from theguidewire 10 ofFIGS. 1 and 2 in the following respects. Theguidewire 20 of the modification includes aninner coil 25 between anouter coil 22 and acore shaft 21. Theinner coil 25 in theguidewire 20 of this modification has no gap between its elemental wires (a so-called closely wound coil). The closely woundinner coil 25 includes a closely wound single-strand coil, a closely wound coil formed by winding a plurality of elemental wires in a helical fashion, or the like. - As shown in
FIG. 3 , a second brazing member 23 b of a distal-end brazing member 23 does not reach thecore shaft 21. In other words, the second brazing member 23 b is provided between theouter coil 22 and theinner coil 25 but is not provided between theinner coil 25 and thecore shaft 21. - As for other points, the
guidewire 20 of the modification is the same as theguidewire 10 ofFIGS. 1 and 2 . Therefore, a brazing material forming afirst brazing member 23 a has a melting point higher than a melting point of a brazing material forming the second brazing member 23 b. Examples of combinations of a brazing material C forming thefirst brazing member 23 a and a brazing material D forming the second brazing member 23 b are the same as the various combinations explained above for theguidewire 10 ofFIGS. 1 and 2 . - A proximal end of the
inner coil 25 and thecore shaft 21 are joined to each other with amiddle brazing member 26. - Also in the
guidewire 20, because the melting point of thefirst brazing member 23 a is higher than the melting point of the second brazing member 23 b, thefirst brazing member 23 a at the distal-most end retains its desired shape reliably even when thefirst brazing member 23 a and the second brazing member 23 b are formed, for example, for reasons related to procedures in assembling theguidewire 20. - In addition, in the
guidewire 20, the second brazing member 23 b is thus provided between theouter coil 22 and theinner coil 25 but is not provided between theinner coil 25 and thecore shaft 21, and, as a result, the amount of the brazing material used for forming the second brazing member 23 b is reduced. For this reason, along with the relationship that the melting point of thefirst brazing member 23 a is higher than the melting point of the second brazing member 23 b, deformation of thefirst brazing member 23 a due to a heat produced during formation of the second brazing member 23 b is prevented more reliably. -
FIG. 4 is an explanatory view of the structure of a distal part of aguidewire 30 according to another modification. Theguidewire 30 ofFIG. 4 is different from theguidewire 20 ofFIG. 3 in the following respects. The distal part of theguidewire 30 includes acurved part 37. In addition, a second brazing member 33 b of a distal-end brazing member 33 is provided in thecurved part 37. - As for other points, the
guidewire 30 ofFIG. 4 is the same as theguidewire 20 ofFIG. 3 . Theguidewire 30 includes acore shaft 31, and anouter coil 32 and aninner coil 35 that surround an outer periphery of thecore shaft 31. A brazing material forming a first brazing member 33 a of the distal-end brazing member 33 has a melting point higher than a melting point of a brazing material forming the second brazing member 33 b. Examples of combinations of a brazing material E forming the first brazing member 33 a and a brazing material F forming the second brazing member 33 b are the same as the various combinations explained above for theguidewire 10 ofFIGS. 1 and 2 . - The proximal end of the
inner coil 35 and thecore shaft 31 are joined to each other with amiddle brazing member 36. - In
FIG. 4 , as in the case of theguidewire 20 ofFIG. 3 , the second brazing member 33 b is provided between theouter coil 32 and theinner coil 35 but is not provided between theinner coil 35 and the core shaft 31 (seeFIG. 4 ). Another configuration, in which noinner coil 35 is provided and the second brazing member 33 b is provided between theouter coil 32 and thecore shaft 31 in thecurved part 37, may also be adopted (not shown in the figures). - However, providing the second brazing member 33 b between the
outer coil 32 and theinner coil 35 in thecurved part 37 as inFIG. 4 is preferable, because the amount of the brazing material used for forming the second brazing member 33 b is reduced, and an influence of heat on the first brazing member 33 a is reduced as a result. - In the
guidewire 30, the presence of the second brazing member 33 b in thecurved part 37 enables retention of the curved shape of theguidewire 30. - In addition, even though the second brazing member 33 b is provided in order to retain the curved shape of the
guidewire 30, the first brazing member 33 a still retains its desired shape because the melting point of the brazing material forming the first brazing member 33 a is higher than the melting point of the brazing material forming the second brazing member 33 b. - Thus, the
guidewire 30 ofFIG. 4 simultaneously retains the desired curved shape of theguidewire 30 and the desired shape of the first brazing member 33 a at the distal-most end. - Although guidewires of the disclosed embodiments are explained above, the present invention is not limited to these embodiments. For example, the
inner coil 25 of theguidewire 20 according toFIG. 3 , which is described as a closely wound coil, may be a loosely wound coil instead (a coil having its elemental wires not in contact with each other and having gaps between the elemental wires). - However, when the
inner coil 25 is a closely wound coil, penetration of the brazing material into the space between theinner coil 25 and thecore shaft 21 is effectively prevented in a process of forming the second brazing member 23 b, and the amount of the brazing material used for forming the second brazing member 23 b is reduced. Therefore, with consideration given to the influence of heat on thefirst brazing member 23 a at the time of forming the second brazing member 23 b, theinner coil 25 is preferably a closely wound coil.
Claims (15)
1. A guidewire comprising:
a core shaft,
an outer coil surrounding an outer periphery of the core shaft,
a first brazing member that joins a distal end of the core shaft to a distal end of the outer coil, and
a second brazing member provided adjacent to and on a proximal side of the first brazing member, wherein
a melting point of the first brazing member is higher than a melting point of the second brazing member.
2. The guidewire according to claim 1 , further comprising:
an inner coil provided between the outer coil and the core shaft, wherein
the second brazing member is provided between the outer coil and the inner coil but is not provided between the inner coil and the core shaft.
3. The guidewire according to claim 1 , wherein the distal end of the core shaft and the distal end of the outer coil penetrate into the first brazing member.
4. The guidewire according to claim 1 , wherein the second brazing member abuts the proximal side of the first brazing member.
5. The guidewire according to claim 3 , wherein the second brazing member abuts the proximal side of the first brazing member.
6. The guidewire according to claim 1 , wherein the first brazing member is formed of a brazing material containing gold, silver and tin.
7. The guidewire according to claim 6 , wherein the second brazing member is formed of a gold-tin brazing material.
8. The guidewire according to claim 6 , wherein the second brazing member is formed of a silver-tin brazing material.
9. The guidewire according to claim 2 , wherein the first brazing member is formed of a brazing material containing gold, silver and tin.
10. The guidewire according to claim 9 , wherein the second brazing member is formed of a gold-tin brazing material.
11. The guidewire according to claim 9 , wherein the second brazing member is formed of a silver-tin brazing material.
12. The guidewire according to claim I, wherein
a distal part of the guidewire includes a curved part, and
the second brazing member is provided in the curved part.
13. The guidewire according to claim 2 , wherein
a distal part of the guidewire includes a curved part, and
the second brazing member is provided in the curved part.
14. The guidewire according to claim 6 , wherein
a distal part of the guidewire includes a curved part, and
the second brazing member is provided in the curved part.
15. The guidewire according to claim 9 , wherein
a distal part of the guidewire includes a curved part, and
the second brazing member is provided in the curved part.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/870,018 US11247027B2 (en) | 2014-09-16 | 2018-01-12 | Guidewire having a distal-end brazing member formed with different brazing portions |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014-187257 | 2014-09-16 | ||
JP2014187257A JP6245760B2 (en) | 2014-09-16 | 2014-09-16 | Guide wire |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/870,018 Division US11247027B2 (en) | 2014-09-16 | 2018-01-12 | Guidewire having a distal-end brazing member formed with different brazing portions |
Publications (1)
Publication Number | Publication Date |
---|---|
US20160074630A1 true US20160074630A1 (en) | 2016-03-17 |
Family
ID=53397933
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/739,349 Abandoned US20160074630A1 (en) | 2014-09-16 | 2015-06-15 | Guidewire |
US15/870,018 Active 2037-01-16 US11247027B2 (en) | 2014-09-16 | 2018-01-12 | Guidewire having a distal-end brazing member formed with different brazing portions |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/870,018 Active 2037-01-16 US11247027B2 (en) | 2014-09-16 | 2018-01-12 | Guidewire having a distal-end brazing member formed with different brazing portions |
Country Status (4)
Country | Link |
---|---|
US (2) | US20160074630A1 (en) |
EP (1) | EP2997993B1 (en) |
JP (1) | JP6245760B2 (en) |
CN (1) | CN105413040B (en) |
Cited By (2)
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---|---|---|---|---|
WO2019212863A1 (en) * | 2018-04-30 | 2019-11-07 | Xcath, Inc. | Introduction device including an electroactive tip on a guidewire |
US20210128872A1 (en) * | 2019-10-31 | 2021-05-06 | Abbott Cardiovascular Systems Inc. | Guidewire coils with different cross section shapes |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017221425A1 (en) * | 2016-06-24 | 2017-12-28 | 朝日インテック株式会社 | Guide wire |
KR20200024287A (en) * | 2017-07-19 | 2020-03-06 | 아사히 인텍크 가부시키가이샤 | Guide wire |
CN112135655B (en) * | 2018-05-01 | 2023-06-13 | 朝日英达科株式会社 | Guide wire |
JP7262557B2 (en) * | 2018-05-01 | 2023-04-21 | 朝日インテック株式会社 | guide wire |
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-
2014
- 2014-09-16 JP JP2014187257A patent/JP6245760B2/en active Active
-
2015
- 2015-06-15 US US14/739,349 patent/US20160074630A1/en not_active Abandoned
- 2015-06-15 EP EP15172028.1A patent/EP2997993B1/en active Active
- 2015-06-19 CN CN201510347706.XA patent/CN105413040B/en active Active
-
2018
- 2018-01-12 US US15/870,018 patent/US11247027B2/en active Active
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US3625200A (en) * | 1969-08-26 | 1971-12-07 | Us Catheter & Instr Corp | Controlled curvable tip member |
US4721117A (en) * | 1986-04-25 | 1988-01-26 | Advanced Cardiovascular Systems, Inc. | Torsionally stabilized guide wire with outer jacket |
US4940062A (en) * | 1988-05-26 | 1990-07-10 | Advanced Cardiovascular Systems, Inc. | Guiding member with deflectable tip |
US5228453A (en) * | 1991-05-07 | 1993-07-20 | Target Therapeutics, Inc. | Catheter guide wire |
US5776080A (en) * | 1992-08-12 | 1998-07-07 | Scimed Life Systems, Inc. | Shaft movement control apparatus |
US5725534A (en) * | 1995-01-03 | 1998-03-10 | William Cook Europe A/S | Method of manufacturing an assembly for positioning an embolization coil in the vascular system, and such an assembly |
US5916166A (en) * | 1996-11-19 | 1999-06-29 | Interventional Technologies, Inc. | Medical guidewire with fully hardened core |
US20060122537A1 (en) * | 2001-10-05 | 2006-06-08 | Brian Reynolds | Composite guidewire |
US20120041420A1 (en) * | 2010-08-10 | 2012-02-16 | Asahi Intecc Co., Ltd. | Guidewire |
JP2013111320A (en) * | 2011-11-30 | 2013-06-10 | Asahi Intecc Co Ltd | Guide wire |
US20130289445A1 (en) * | 2012-04-26 | 2013-10-31 | Asahi Intecc Co. Ltd. | Guidewire |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019212863A1 (en) * | 2018-04-30 | 2019-11-07 | Xcath, Inc. | Introduction device including an electroactive tip on a guidewire |
US20210128872A1 (en) * | 2019-10-31 | 2021-05-06 | Abbott Cardiovascular Systems Inc. | Guidewire coils with different cross section shapes |
Also Published As
Publication number | Publication date |
---|---|
US11247027B2 (en) | 2022-02-15 |
JP6245760B2 (en) | 2017-12-13 |
EP2997993A1 (en) | 2016-03-23 |
JP2016059438A (en) | 2016-04-25 |
US20180133439A1 (en) | 2018-05-17 |
CN105413040A (en) | 2016-03-23 |
CN105413040B (en) | 2019-05-03 |
EP2997993B1 (en) | 2017-04-12 |
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Owner name: ASAHI INTECC CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MURATA, SATORU;KOIKE, TADAHIRO;NAKAGAWA, YUMIKO;SIGNING DATES FROM 20150604 TO 20150615;REEL/FRAME:035909/0866 |
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STCB | Information on status: application discontinuation |
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