USRE36628E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a differentially heat treated catheter guide wire
Assignee: Terumo Corp
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Filing: 1997-10-16
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Granted: 2000-03-28
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Expires: 2017-10-16
Abstract
Abstract A catheter guide wire is provided for guiding a catheter into a body cavity such as a blood vessel. The base material constituting the wire is made of an elastic alloy wire and subjected to a heat treatment such that its flexibility is sequentially increased from its proximal to distal end portions. A thermoplastic resin or/and a coil spring can be applied to at least the distal end portion of the wire base material. A method of manufacturing the catheter guide wire is also provided. The method is characterized in that the leading end side of the base material is divided into a plurality of areas and subjected to a heat treatment by changing the heat treatment temperature and the time conditions in units of the areas so that the flexibility of the base material is sequentially increased from the proximal to distal end portions of the leading end side.
Inventors
- 👤 Kyuta Sagae
- 👤 Yoshiaki Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:40
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/09; A61M2025/09058; A61M2025/09083; A61M2025/09133; A61M2025/09141
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
196 words
A method of making a catheter guide wire for guiding a catheter, said method comprising: forming a wire member comprising a superelastic Ni-Ti alloy wire as a base material, said base material having a proximal end portion and a leading end side; dividing said leading end side of said base material into a plurality of areas along the length thereof and a distal end portion, said plurality of areas comprising an intermediate portion between said proximal and distal end portions; and subjecting only said intermediate portion and said distal end portion to a primary heat treatment at a temperature of 400° to 500° C. for about two hours, and then subjecting only said distal end portion to a secondary heat treatment at a temperature of about 200° C. for about 24 hours, whereby said proximal end portion is not heat treated after cold rolling, such that said distal end portion, after said primary and secondary heat treatments, has a yield stress of approximately 5 to 7 kg/mm 2 , and at least one of said areas at said intermediate portion, after said heat treatment, has a yield stress of approximately 11 to 12 kg/mm 2 .
Claim 2
Independent Claim
196 words
A method of making a catheter guide wire for guiding a catheter, said method comprising: forming a wire member comprising a superelastic Ni-Ti alloy wire as a base material, said base material having a proximal end portion and a leading end side; dividing said leading end side of said base material into a plurality of areas along the length thereof and a distal end portion, said plurality of areas comprising an intermediate portion between said proximal and distal end portions; and subjecting only said intermediate portion and said distal end portion to a primary heat treatment at a temperature of 400° to 500° C. for about two hours, and then subjecting only said distal end portion to a secondary heat treatment at a temperature of about 200° C. for about 24 hours, whereby said proximal end portion is not heat treated after cold rolling, such that said distal end portion, after said primary and secondary heat treatments, has a yield stress of approximately 5 to 7 kg/mm 2 , and at least one of said areas at said intermediate portion, after said heat treatment, has a yield stress of approximately 11 to 12 kg/mm 2 .
Claim 3
Dependent Claim
29 words
A method according to claim 1, comprising forming said wire member so as to have a proximal end portion having an outer diameter ranging from 0.2 to 0.4 mm.
Claim 4
Independent Claim
171 words
A method of making a catheter guide wire for guiding a catheter, said method comprising: forming a wire member comprising a superelastic Ni-Ti alloy wire as a base material, said base material having a proximal end portion and a leading end side; dividing said leading end side of said base material into a plurality of areas along the length thereof and a distal end portion, said plurality of areas comprising an intermediate portion between said proximal and distal end portions; and subjecting only said intermediate portion and said distal end portion to a primary heat treatment at a temperature of 400° to 500° C. for about two hours, and thereafter subjecting only said distal end portion to a secondary heat treatment at a temperature of about 200° C. for about 24 hours, whereby said proximal end portion is not heat treated after cold rolling, such that, after said primary and secondary heat treatments, flexibility of the guide wire is increased from said proximal end portion to said distal end portion thereof.
Claim 5
Independent Claim
171 words
A method of making a catheter guide wire for guiding a catheter, said method comprising: forming a wire member comprising a superelastic Ni-Ti alloy wire as a base material, said base material having a proximal end portion and a leading end side; dividing said leading end side of said base material into a plurality of areas along the length thereof and a distal end portion, said plurality of areas comprising an intermediate portion between said proximal and distal end portions; and subjecting only said intermediate portion and said distal end portion to a primary heat treatment at a temperature of 400° to 500° C. for about two hours, and thereafter subjecting only said distal end portion to a secondary heat treatment at a temperature of about 200° C. for about 24 hours, whereby said proximal end portion is not heat treated after cold rolling, such that, after said primary and secondary heat treatments, flexibility of the guide wire is increased from said proximal end portion to said distal end portion thereof.
Claim 6
Dependent Claim
30 words
A method according to claim 3, comprising forming said wire member so as to have a proximal end portion having an outer diameter ranging from 0.2 to 0.4 mm. .Iadd.
Claim 7
Dependent Claim
300 words
A process for forming a guide wire for a catheter, said guide wire having a proximal end and a distal end, comprising: forming a Ni-Ti alloy wire; cold rolling said Ni-Ti alloy wire; forming said distal end portion and said proximal end portion of said guide wire, said distal end portion having a diameter that is less than a diameter of said proximal end portion; and subsequently heat treating said distal end portion of said guide wire so as to make said distal end portion more flexible than said proximal end portion. .Iaddend..Iadd.6. A process for forming a guide wire for a catheter, said guide wire having a proximal end and a distal end, comprising: forming a Ni-Ti alloy wire; cold rolling said Ni-Ti alloy wire; forming said distal end portion and said proximal end portion of said guide wire, said distal end portion having a diameter that is less than a diameter of said proximal end portion; subsequently heat treating said distal end portion of said guide wire so as to make said distal end portion more flexible than said proximal end portion; and forming a thermoplastic resin layer on said guide wire. .Iaddend..Iadd.7. A process for forming a guide wire for a catheter, said guide wire having a proximal end and a distal end, comprising: forming a Ni-Ti alloy wire; cold rolling said Ni-Ti alloy wire; forming said distal end portion and said proximal end portion of said guide wire, said distal end portion having a diameter that is less than a diameter of said proximal end portion; subsequently heat treating said distal end portion of said guide wire so as to make said distal end portion more flexible than said proximal end portion; and mounting a coil spring around at least a portion of said guide wire.
Claim 8
Dependent Claim
300 words
A process for forming a guide wire for a catheter, said guide wire having a proximal end and a distal end, comprising: forming a Ni-Ti alloy wire; cold rolling said Ni-Ti alloy wire; forming said distal end portion and said proximal end portion of said guide wire, said distal end portion having a diameter that is less than a diameter of said proximal end portion; and subsequently heat treating said distal end portion of said guide wire so as to make said distal end portion more flexible than said proximal end portion. .Iaddend..Iadd.6. A process for forming a guide wire for a catheter, said guide wire having a proximal end and a distal end, comprising: forming a Ni-Ti alloy wire; cold rolling said Ni-Ti alloy wire; forming said distal end portion and said proximal end portion of said guide wire, said distal end portion having a diameter that is less than a diameter of said proximal end portion; subsequently heat treating said distal end portion of said guide wire so as to make said distal end portion more flexible than said proximal end portion; and forming a thermoplastic resin layer on said guide wire. .Iaddend..Iadd.7. A process for forming a guide wire for a catheter, said guide wire having a proximal end and a distal end, comprising: forming a Ni-Ti alloy wire; cold rolling said Ni-Ti alloy wire; forming said distal end portion and said proximal end portion of said guide wire, said distal end portion having a diameter that is less than a diameter of said proximal end portion; subsequently heat treating said distal end portion of said guide wire so as to make said distal end portion more flexible than said proximal end portion; and mounting a coil spring around at least a portion of said guide wire.
Claim 9
Dependent Claim
116 words
.Iaddend..Iadd.8. A process for forming a guide wire for a catheter, said guide wire having a proximal end and a distal end, comprising: forming a Ni-Ti alloy wire; cold rolling said Ni-Ti alloy wire; forming said distal end portion and said proximal end portion of said guide wire, said distal end portion having a diameter that is less than a diameter of said proximal end portion; subsequently heat treating said distal end portion of said guide wire so as to make said distal end portion more flexible than said proximal end portion; forming a thermoplastic resin layer on said guide wire; and mounting a coil spring around at least a portion of said guide wire. .Iaddend.
Claim 10
Dependent Claim
116 words
.Iaddend..Iadd.8. A process for forming a guide wire for a catheter, said guide wire having a proximal end and a distal end, comprising: forming a Ni-Ti alloy wire; cold rolling said Ni-Ti alloy wire; forming said distal end portion and said proximal end portion of said guide wire, said distal end portion having a diameter that is less than a diameter of said proximal end portion; subsequently heat treating said distal end portion of said guide wire so as to make said distal end portion more flexible than said proximal end portion; forming a thermoplastic resin layer on said guide wire; and mounting a coil spring around at least a portion of said guide wire. .Iaddend.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-28 | 2003-09-27 | 2004-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-28 | 2007-09-27 | 2008-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-28 | 2011-09-27 | 2012-03-28 | $7700.00 | Window Closed / Lapsed |