# US 11,440,127 B2 · Methods for counteracting rebounding effects during solid state resistance welding of dissimilar materials > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,440,127 B2 - Document ID: US11440127B2 - Status: Granted - Kind: B2 - Application number: 16/897,784 - Filed: 2020-06-10 - Published: 2020-09-24 - Granted: 2022-09-13 - Earliest claimed: 2013-01-17 - Assignees: Abbott Cardiovascular Systems Inc. - Applicants: Abbott Cardiovascular Systems, Inc. - Inventors: John A. Simpson; Jeffrey F. Dooley; Matthew J. Gillick - Web page: https://patentgrep.com/patent/US11440127B2 ## CPC - B23K 11/20: of different metals - A61M 25/09: Guide wires - B23K 11/00: Resistance welding; Severing by resistance heating - B23K 11/04: Flash butt welding - A61M 2025/09108: {Methods for making a guide wire} - A61M 2025/09133: {having specific material compositions or coatings; Materials with specific mechanical behaviours, e.g. stiffness, strength to transmit torque} - B23K 2101/32: Wires - B23K 2103/02: Iron or ferrous alloys - B23K 2103/05: {Stainless steel} - B23K 2103/14: Titanium or alloys thereof - B23K 2103/26: {Alloys of Nickel and Cobalt and Chromium} - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - 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 The present disclosure is directed to a multi-segment device, such as an intravascular guide wire. The multi-segment device includes an elongate first portion comprising a first metallic material, an elongate second portion comprising a different metallic material, the first and second elongate portions being directly joined together end to end by a solid-state weld, and a heat affected zone surrounding an interface of the weld where the first and second portions are joined together, wherein the heat affected zone has an average thickness of less than about 0.20 mm. ## Claims ### Claim 1 A multi-segment guidewire, the guidewire comprising: a first elongate portion of a first material; a second elongate portion of a second material having a higher modulus of elasticity than a material of the first elongate portion; a solid-state deformation region disposed at a junction of a distal end of the first elongate portion and a proximal end of the second elongate portion, a distal-most end of the first elongate portion and a proximal-most end of the second elongate portion being free of any oxide layers, wherein the distal end and the proximal end are joined without melting of the first material and the second material. ### Claim 2 (depends on 1) The multi-segment device of claim 1, further comprising a heat affected zone at the solid-state deformation region, wherein the heat affected zone has an average thickness across the junction of the first elongate portion and the second elongate portion of less than about 0.20 mm. ### Claim 3 (depends on 2) The multi-segment device of claim 2, wherein, the heat affected zone has a first thickness, in a direction aligned with a longitudinal axis of the multi-segment device, toward a center of the solid-state deformation region that is less than a second thickness, in the direction aligned with the longitudinal axis of the multi-segment device, toward a perimeter of the solid-state deformation region. ### Claim 4 (depends on 1) The multi-segment device of claim 1, wherein the distal-most end and the proximal-most end are each flattened and smooth. ### Claim 5 (depends on 1) The multi-segment device of claim 1, wherein the second elongate portion includes a tapered section. ### Claim 6 (depends on 1) The multi-segment device of claim 1, further comprising a coil disposed about at least a portion of the second elongate portion. ### Claim 7 (depends on 1) The multi-segment device of claim 1, wherein the second elongate portion includes a flattened, shapeable distal tip. ### Claim 8 (depends on 1) The multi-segment device of claim 1, wherein the second elongate portion comprises a pseudoelastic alloy including about 30 atomic percent to about 52 atomic percent titanium, up to about 10 atomic percent of one or more other alloying elements, with a balance of nickel. ### Claim 9 (depends on 8) The multi-segment device of claim 8, wherein the one or more other alloying elements comprises alloying elements selected from iron, cobalt, vanadium, platinum, palladium, copper, and combinations thereof. ### Claim 10 (depends on 1) The multi-segment device of claim 1, wherein the heat affected zone has an average thickness of less than about 0.18 mm. ### Claim 11 (depends on 1) The multi-segment device of claim 1, wherein the heat affected zone has an average thickness from about 0.15 mm to about 0.18 mm. ### Claim 12 (depends on 1) The multi-segment device of claim 1, wherein second elongate portion comprises a nickel-titanium alloy. ### Claim 13 (depends on 1) The multi-segment device of claim 1 wherein first elongate portion comprises stainless steel. ### Claim 14 (depends on 1) The multi-segment device of claim 1, wherein one of the first elongate portion and the second elongate portion comprises a nickel-titanium alloy and the other of the first elongate portion and the second elongate portion comprises stainless steel or a cobalt-chromium alloy. ### Claim 15 (depends on 1) The multi-segment device of claim 1, wherein the device exhibits a minimum strength value of at least 2.9 psi. ### Claim 16 (depends on 1) The multi-segment device of claim 1, wherein the device exhibits a mean strength value of at least 3.94 psi. ### Claim 17 (depends on 1) The multi-segment device of claim 1, wherein the device exhibits a Cpk value with respect to strength that is greater than 0.94. ### Claim 18 (depends on 11) The multi-segment device of claim 11, wherein the device exhibits a Cpk value with respect to strength that is at least about 1.74. ### Claim 19 A multi-segment guidewire, the guidewire comprising: a first elongate portion of a first material, the first elongate portion comprising a smooth and flattened distal-most end; a second elongate portion of a second material having a higher modulus of elasticity than a material of the first elongate portion, the second elongate portion comprising a smooth and flattened proximal-most end; a solid-state deformation region including a junction of the distal-most end and the proximal-most end, each being free of any oxide layers, a distal end of the first elongate portion and a proximal end of the second elongate portion are joined without melting of the first material and the second material. ### Claim 20 A multi-segment guidewire, the guidewire comprising: a first elongate portion of a first material, the first elongate portion comprising a smooth and flattened distal-most end; a second elongate portion of a second material having a higher modulus of elasticity than a material of the first elongate portion, the second elongate portion comprising a smooth and flattened proximal-most end; a solid-state deformation region including a junction of the distal-most end and the proximal-most end, each being free of any oxide layers, a distal end of the first elongate portion and a proximal end of the second elongate portion are joined without melting of the first material and the second material, wherein a heat affected zone is formed in the solid-state deformation region, the heat affected zone having an average thickness across the junction of the first elongate portion and the second elongate portion of less than about 0.20 mm, the heat affected zone having a first thickness toward a center of the solid-state deformation region, and in a direction aligned with a longitudinal axis of the multi-segment device, that is less than a second thickness toward a perimeter of the solid-state deformation region, and in the direction aligned with the longitudinal axis of the multi-segment device.