# US 2019/0167947 A1 · Balloon catheter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0167947 A1 - Document ID: US20190167947A1 - Status: Published application - Kind: A1 - Application number: 16/269,643 - Filed: 2019-02-07 - Published: 2019-06-06 - Earliest claimed: 2015-03-27 - Assignees: Asahi Intecc Co., Ltd. - Applicants: Asahi Intecc Co., Ltd. - Inventors: Takeharu KATSURADA; Takeshi MOGI - Web page: https://patentgrep.com/patent/US20190167947A1 ## CPC - A61M 25/0108: {using radio-opaque or ultrasound markers} - A61M 25/0052: {Localized reinforcement, e.g. where only a specific part of the catheter is reinforced, for rapid exchange guidewire port} - A61M 25/10: Balloon catheters ({A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02;} inflatable balloons for placing stents or stent-grafts A61F2/958 {; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00}) - A61M 25/1006: {Balloons formed between concentric tubes} - A61B 2090/3966: {Radiopaque markers visible in an X-ray image} - A61M 2025/1079: {having radio-opaque markers in the region of the balloon} - 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)} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A balloon catheter includes a balloon and an inner shaft. The inner shaft includes a marker member arranged on an outer periphery of a coil body having a sparsely wound portion in which gaps are formed between adjacent windings of the wire of the coil body. A distal end part and a proximal end part of the marker member are arranged at a position facing a void formed within one of the gaps between the adjacent windings of the wire of the coil body. The inner shaft of the balloon catheter therefore will not buckle, preventing damage to the balloon by contact with the marker member when the balloon catheter is passed through the inside of a curved blood vessel. ## Claims ### Claim 1 A balloon catheter comprising: a balloon; and an inner shaft joined to the balloon, the inner shaft comprising: an inner layer; a coil body arranged on an outer periphery of the inner layer and having a sparsely wound portion in which gaps are formed between adjacent windings of a wire forming the coil body; a marker member arranged on an outer periphery of the coil body at the sparsely wound portion without contacting the inner layer along an entire length of the marker member and having a distal end part and a proximal end part, and an outer layer covering the coil body and the marker member, wherein: at least one of the gaps forms a void such that the outer layer is not disposed in the void, at least one of the distal end part and the proximal end part of the marker member is arranged at a position facing the void without contacting the inner layer, and at least one of a distal end surface and a proximal end surface of the marker member extends along a winding direction of the wire forming the coil body. ### Claim 2 (depends on 1) The balloon catheter according to claim 1, wherein the gaps between the adjacent wires of the coil body are filled with the outer layer in a region where the marker member is not arranged. ### Claim 3 (depends on 1) The balloon catheter according to claim 1, wherein the gaps form a plurality of voids such that the outer layer is not disposed in the plurality of voids, and the distal end part and the proximal end part of the marker member are each arranged at a position facing a void of the plurality of voids. ### Claim 4 (depends on 2) The balloon catheter according to claim 2, wherein the gaps form a plurality of voids such that the outer layer is not disposed in the plurality of voids, and the distal end part and the proximal end part of the marker member are each arranged at a position facing a void of the plurality of voids. ### Claim 5 (depends on 1) The balloon catheter according to claim 1, wherein the gaps form a plurality of voids such that the outer layer is not disposed in the plurality of voids, and the marker member is adjacent to the plurality of voids. ### Claim 6 (depends on 2) The balloon catheter according to claim 2, wherein the gaps form a plurality of voids such that the outer layer is not disposed in the plurality of voids, and the marker member is adjacent to the plurality of voids ### Claim 7 (depends on 1) The balloon catheter according to claim 1, wherein the at least one of the distal end part and the proximal end part of the marker member is curved toward the inner layer. ### Claim 8 (depends on 1) The balloon catheter according to claim 1, wherein both the distal end part and the proximal end part of the marker member are curved toward the inner layer. ### Claim 9 (depends on 7) The balloon catheter according to claim 7, wherein the at least one of the distal end part and the proximal end part of the marker member resides completely inside the void. ### Claim 10 (depends on 8) The balloon catheter according to claim 8, wherein both the distal end part and the proximal end part of the marker member reside completely inside the void. ### Claim 11 (depends on 1) The balloon catheter according to claim 1, further comprising: an outer shaft, wherein: a distal end of the outer shaft is attached to a proximal end of the balloon, the inner shaft extends through the outer shaft and the balloon, and a distal end of the inner shaft is attached to a distal end of the balloon. ### Claim 12 (depends on 1) The balloon catheter according to claim 1, wherein the entirety of the marker member is disposed radially outward of the void.