Patents by Inventor Sepehr Fariabi
Sepehr Fariabi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6461453Abstract: An improved guiding member for use within a body lumen having a unique combination of superelastic characteristics. The superelastic alloy material has a composition consisting of about 30% to about 52% (atomic) titanium, and about 38% to 52% nickel and may have one or more elements selected from the group consisting of iron, cobalt, platinum, palladium, vanadium, copper, zirconium, hafnium and niobium. The alloy material is subjected to thermomechanical processing which includes a final cold working of about 10 to about 75% and then a heat treatment at a temperature between about 450° and about 600° C. and preferably about 475° to about 550° C. Before the heat treatment the cold worked alloy material is preferably subjected to mechanical straightening. The alloy material is preferably subjected to stresses equal to about 5 to about 50% of the room temperature ultimate yield stress of the material during the thermal treatment.Type: GrantFiled: June 7, 2000Date of Patent: October 8, 2002Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Robert M. Abrams, Sepehr Fariabi
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Publication number: 20020121316Abstract: An improved guiding member for use within a body lumen having a unique combination of superelastic characteristics. The superelastic alloy material has a composition consisting of about 30% to about 52% (atomic) titanium, and about 38% to 52% nickel and may have one or more elements selected from the group consisting of iron, cobalt, platinum, palladium, vanadium, copper, zirconium, hafnium and niobium. The alloy material is subjected to thermomechanical processing which includes a final cold working of about 10 to about 75% and then a heat treatment at a temperature between about 450° and about 600° C. and preferably about 475° to about 550° C. Before the heat treatment the cold worked alloy material is preferably subjected to mechanical straightening. The alloy material is preferably subjected to stresses equal to about 5 to about 50% of the room temperature ultimate yield stress of the material during the thermal treatment.Type: ApplicationFiled: April 5, 2002Publication date: September 5, 2002Inventors: Robert M. Abrams, Sepehr Fariabi
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Patent number: 6419693Abstract: This invention is directed to an intracorporeal device formed of a high strength Co—Ni—Cr alloy and is particularly suitable for forming a composite product with a pseudoelastic member formed of NiTi alloy. Suitable intracorporeal products include guidewires and stents. The high strength alloy consists essentially of about 28 to about 65% cobalt, about 2 to about 40% nickel, about 5 to about 35% chromium, up to about 12% molybdenum, up to about 20% tungsten, up to about 20% iron and the balance inconsequential amounts of impurities and other alloying constituents, with a preferred alloy composition including about 30 to about 45% cobalt, about 25 to about 37% nickel, about 15 to about 25% chromium and about 5 to about 15% molybdenum. Intravascular devices such as guidewires, stents and the like can be formed of this high strength Co—Ni—Cr alloy.Type: GrantFiled: May 1, 1998Date of Patent: July 16, 2002Assignee: Advanced Cardiovascular Systems, Inc.Inventor: Sepehr Fariabi
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Publication number: 20020046785Abstract: An improved guiding member for use within a body lumen having a unique combination of superelastic characteristics. The superelastic alloy material has a composition consisting of about 30% to about 52% (atomic) titanium, and about 38% to 52% nickel and may have one or more elements selected from the group consisting of iron, cobalt, platinum, palladium, vanadium, copper, zirconium, hafnium and niobium. The alloy material is subjected to thermomechanical processing which includes a final cold working of about 10 to about 75% and then a heat treatment at a temperature between about 450° and about 600° C. and preferably about 475° to about 550° C. Before the heat treatment the cold worked alloy material is preferably subjected to mechanical straightening. The alloy material is preferably subjected to stresses equal to about 5 to about 50% of the room temperature ultimate yield stress of the material during the thermal treatment.Type: ApplicationFiled: June 18, 2001Publication date: April 25, 2002Applicant: Advanced Cardiovascular Systems, Inc.Inventors: Robert M. Abrams, Sepehr Fariabi
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Publication number: 20020022830Abstract: Apparatus and methods are disclosed for accessing the interior of an intervertebral disc to perform a function within the disc. The apparatus comprises a catheter having a lumen; and a guide wire having a distal portion and a proximal portion, and configured to be positioned within and moved relative to the lumen of the catheter; wherein the guide wire is capable of navigating itself within an intradiscal section of the intervertebral to a selected section of the disc and the catheter is capable of being advanced relative to the guide wire such that the catheter follows a path of the guide wire within the intradiscal section of the disc to the selected section. These apparatus and methods may be used for the treatment of intervertebral disc disorders such as sealing fissures of the annulus fibrosus, which may or may not be accompanied with contained or escaped extrusions. These apparatus and methods may also be used for the removal or addition of material to the intervertebral disc.Type: ApplicationFiled: February 22, 2001Publication date: February 21, 2002Inventors: Hugh R. Sharkey, Sepehr Fariabi, John Ashley, Joel Saal, Jeffrey Saal
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Publication number: 20020019626Abstract: Apparatus and methods are disclosed for accessing the interior of an intervertebral disc to perform a function within the disc. The apparatus comprises a catheter having a lumen; and a guide wire having a distal portion and a proximal portion, and configured to be positioned within and moved relative to the lumen of the catheter; wherein the guide wire is capable of navigating itself within an intradiscal section of the intervertebral to a selected section of the disc and the catheter is capable of being advanced relative to the guide wire such that the catheter follows a path of the guide wire within the intradiscal section of the disc to the selected section. These apparatus and methods may be used for the treatment of intervertebral disc disorders such as sealing fissures of the annulus fibrosus, which may or may not be accompanied with contained or escaped extrusions. These apparatus and methods may also be used for the removal or addition of material to the intervertebral disc.Type: ApplicationFiled: June 18, 2001Publication date: February 14, 2002Inventors: Hugh R. Sharkey, Sepehr Fariabi, John Ashley, Joel Saal, Jeffrey Saal
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Publication number: 20010039412Abstract: A guidewire having a core section formed of a NiTi alloy which is in an austenite phase when being manufactured but which is converted to the martensite phase at operating (body) temperature (37° C.) and can be transformed to an austenite phase by heating to a temperature above body temperature but below 50° C. When in the austenite phase, the core section is at a high strength level which ensures the tracking of a catheter over the guidewire within a patient's body lumen.Type: ApplicationFiled: July 12, 2001Publication date: November 8, 2001Applicant: ADVANCED CARDIOVASCULAR SYSTEMS, INC.Inventor: Sepehr Fariabi
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Patent number: 6287292Abstract: A guidewire having a core section formed of a NiTi alloy which is in an austenite phase when being manufactured but which is converted to the martensite phase at operating (body) temperature (37° C.) and can be transformed to an austenite phase by heating to a temperature above body temperature but below 50° C. When in the austenite phase, the core section is at a high strength level which ensures the tracking of a catheter over the guidewire within a patient's body lumen. In one preferred embodiment the core section is heated by electrical resistance or inductance.Type: GrantFiled: April 6, 1999Date of Patent: September 11, 2001Assignee: Advanced Cardiovascular Systems, Inc.Inventor: Sepehr Fariabi
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Patent number: 6280539Abstract: An improved guiding member for use within a body lumen having a unique combination of superelastic characteristics. The superelastic alloy material has a composition consisting of about 30% to about 52% (atomic) titanium, and about 38% to 52% nickel and may have one or more elements selected from the group consisting of iron, cobalt, platinum, palladium, vanadium, copper, zirconium, hafnium and niobium. The alloy material is subjected to thermomechanical processing which includes a final cold working of about 10 to about 75% and then a heat treatment at a temperature between about 450° and about 600° C. and preferably about 475° to about 550° C. Before the heat treatment the cold worked alloy material is preferably subjected to mechanical straightening. The alloy material is preferably subjected to stresses equal to about 5 to about 50% of the room temperature ultimate yield stress of the material during the thermal treatment.Type: GrantFiled: February 7, 2000Date of Patent: August 28, 2001Assignee: Advance Cardiovascular Systems, Inc.Inventors: Robert M. Abrams, Sepehr Fariabi
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Patent number: 6165292Abstract: An improved guiding member for use within a body lumen having a unique combination of superelastic characteristics. The superelastic alloy material has a composition consisting of about 30% to about 52% (atomic) titanium, and about 38% to 52% nickel and may have one or more elements selected from the group consisting of iron, cobalt, platinum, palladium, vanadium, copper, zirconium, hafnium and niobium. The alloy material is subjected to thermomechanical processing which includes a final cold working of about 10 to about 75% and then a heat treatment at a temperature between about 450.degree. and about 600.degree. C. and preferably about 475.degree. to about 550.degree. C. Before the heat treatment the cold worked alloy material is preferably subjected to mechanical straightening. The alloy material is preferably subjected to stresses equal to about 5 to about 50% of the room temperature ultimate yield stress of the material during the thermal treatment.Type: GrantFiled: June 7, 1995Date of Patent: December 26, 2000Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Robert M. Abrams, Sepehr Fariabi
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Patent number: 5948184Abstract: An elongated flexible housing for an atherectomy or other intracorporeal catheter which is formed of a shape memory alloy such as an alloy formed predominantly of NiTi intermetallic compound. The housing preferably has an inner chamber with a tissue cutter or other diagnostic or therapeutic system provided within the chamber to sever stenotic material which is urged into the chamber through a opening or window in the housing. In one embodiment the housing has at least one section which is relatively flexible with adjacent sections which are relatively stiff to provide an increase in the overall flexibility of the housing.Type: GrantFiled: August 22, 1997Date of Patent: September 7, 1999Assignee: Devices for Vascular Intervention, Inc.Inventors: John J. Frantzen, Sepehr Fariabi
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Patent number: 5931819Abstract: A guidewire having a core section formed of a NiTi alloy which is in an austenite phase when being manufactured but which is converted to the martensite phase at operating (body) temperature (37.degree. C.) and can be transformed to an austenite phase by heating to a temperature above body temperature but below 50.degree. C. When in the austenite phase, the core section is at a high strength level which ensures the tracking of a catheter over the guidewire within a patient's body lumen. In one preferred embodiment the core section is heated by electrical resistance or inductance.Type: GrantFiled: April 18, 1996Date of Patent: August 3, 1999Assignee: Advanced Cardiovascular Systems, Inc.Inventor: Sepehr Fariabi
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Patent number: 5776114Abstract: An elongated flexible housing for an atherectomy or other intracorporeal catheter which is formed of a shape memory alloy such ass an alloy formed predominantly of NiTi intermetallic compound. The housing preferably has an inner chamber with a tissue cutter or other diagnostic or therapeutic system provided within the chamber to sever stenotic material which is urged into the chamber through a opening or window in the housing. In one embodiment the housing has at least one section which is relatively flexible with adjacent sections which are relatively stiff to provide an increase in the overall flexibility of the housing.Type: GrantFiled: January 23, 1996Date of Patent: July 7, 1998Assignee: Devices For Vascular Intervention, Inc.Inventors: John J. Frantzen, Sepehr Fariabi
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Patent number: 5636641Abstract: This invention is directed to an intracorporeal device formed of a high strength Co--Ni--Cr alloy and is particularly suitable for forming a composite product with a pseudoelastic member formed of NiTi alloy. Suitable intracorporeal products include guidewires and stents. The high strength alloy consists essentially of about 28 to about 65% cobalt, about 2 to about 40% nickel, about 5 to about 35% chromium, up to about 12% molybdenum, up to about 20% tungsten, up to about 20% iron and the balance inconsequential amounts of impurities and other alloying constituents, with a preferred alloy composition including about 30 to about 45% cobalt, about 25 to about 37% nickel, about 15 to about 25% chromium and about 5 to about 15% molybdenum. Intravascular devices such as guidewires, stents and the like can be formed of this high strength Co--Ni--Cr alloy.Type: GrantFiled: July 25, 1994Date of Patent: June 10, 1997Assignee: Advanced Cardiovascular Systems, Inc.Inventor: Sepehr Fariabi
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Patent number: 5637089Abstract: An improved guiding member for use within a body lumen having a unique combination of superelastic characteristics. The superelastic alloy material has a composition consisting of about 30% to about 52% (atomic) titanium, and about 38% to 52% nickel and may have one or more elements selected from the group consisting of iron, cobalt, platinum, palladium, vanadium, copper, zirconium, hafnium and niobium. The alloy material is subjected to thermomechanical processing which includes a final cold working of about 10 to about 75% and then a heat treatment at a temperature between about 450.degree. and about 600.degree. C. and preferably about 475.degree. to about 550.degree. C. Before the heat treatment the cold worked alloy material is preferably subjected to mechanical straightening. The alloy material is preferably subjected to stresses equal to about 5 to about 50% of the room temperature ultimate yield stress of the material during the thermal treatment.Type: GrantFiled: February 12, 1996Date of Patent: June 10, 1997Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Robert M. Abrams, Sepehr Fariabi
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Patent number: 5514115Abstract: An elongated flexible housing for an atherectomy or other intracorporeal catheter which is formed of a shape memory alloy such as an alloy formed predominantly of NiTi intermetallic compound. The housing preferably has an inner chamber with a tissue cutter or other diagnostic or therapeutic system provided within the chamber to sever stenotic material which is urged into the chamber through a opening or window in the housing. In one embodiment the housing has at least one section which is relatively flexible with adjacent sections which are relatively stiff to provide an increase in the overall flexibility of the housing.Type: GrantFiled: July 7, 1993Date of Patent: May 7, 1996Assignee: Device for Vascular Intervention, Inc.Inventors: John J. Frantzen, Sepehr Fariabi
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Patent number: 5411476Abstract: An improved guiding member for advancing a catheter within a body lumen having a unique combination of superelastic characteristics. The superelastic alloy material has a composition consisting of titanium and nickel and may have one or more elements selected from the group consisting of iron, cobalt, vanadium and copper. The alloy material is cold worked and then heat treated at a temperature well above the austenite-to-martensite transformation temperature, while being subjected to longitudinal stresses equal to about 5 to about 50% of the room temperature yield stress to impart to the metal a straight "memory". The guiding member using such improved material exhibits a stress-induced austenite-to-martensite phase transformation at an exceptionally high constant yield strength of at least 90 ksi for solid members and at least 70 ksi for tubular members with a broad recoverable strain of at least about 4% during the phase transformation.Type: GrantFiled: June 2, 1993Date of Patent: May 2, 1995Assignee: Advanced Cardiovascular Systems, Inc.Inventors: Robert M. Abrams, Sepehr Fariabi
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Patent number: 4881981Abstract: A process for adjusting the physical and mechanical properties of a shape memory alloy member of a known chemical composition comprising the steps of increasing the internal stress level and forming said member to a desired configuration and heat treating said member at a selected memory imparting temperature.Type: GrantFiled: April 20, 1988Date of Patent: November 21, 1989Assignee: Johnson Service CompanyInventors: Paul E. Thoma, David N. AbuJodom, II, Sepehr Fariabi
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Patent number: 4673842Abstract: A cathode cup structure for a high voltage x-ray tube having a base formed of a weldable material and an exposed upper surface of a non-weldable material bonded to the base. The upper surface may be machined from a block of graphite to form an appropriate cathode cup structure configuration and then bonded to a base formed of TZM using a platinum brazing compound. The graphite upper surface may be coated with pyroltic carbon to reduce dust or alternatively, may be formed of a composition of silicon carbide graphite to minimize dusting problems. The graphite composition of the upper section of the cathode cup minimizes the risk of welding of an electron emissive filament passing through the cup structure.Type: GrantFiled: September 3, 1985Date of Patent: June 16, 1987Assignee: General Electric CompanyInventors: Ronald D. Grieger, Sepehr Fariabi, Joshua O. Kolawole