# US 11,439,791 B2 · Catheter and manufacturing method of catheter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,439,791 B2 - Document ID: US11439791B2 - Status: Granted - Kind: B2 - Application number: 16/529,567 - Filed: 2019-08-01 - Published: 2019-11-21 - Granted: 2022-09-13 - Earliest claimed: 2017-03-23 - Assignees: Terumo Kabushiki Kaisha - Applicants: Terumo Kabushiki Kaisha - Inventors: Masahiro Ishida - Web page: https://patentgrep.com/patent/US11439791B2 ## CPC - A61M 25/0029: {characterized by features relating to least one lumen located at the middle part of the catheter, e.g. slots, flaps, valves, cuffs, apertures, notches, grooves or rapid exchange ports (catheter shaft surface irregularities A61M2025/006)} - A61M 25/0009: {Making of catheters or other medical or surgical tubes} - A61M 25/003: {characterized by features relating to least one lumen located at the distal part of the catheter, e.g. filters, plugs or valves (catheter tips A61M25/0067)} - A61M 25/0074: {Dynamic characteristics of the catheter tip, e.g. openable, closable, expandable or deformable} - B29C 48/06: Rod-shaped - A61M 25/0052: {Localized reinforcement, e.g. where only a specific part of the catheter is reinforced, for rapid exchange guidewire port} - A61M 25/0054: {with regions for increasing flexibility} - A61M 25/0097: {characterised by the hub (tube connectors or tube couplings A61M39/10)} - A61M 2025/0031: {characterized by lumina for withdrawing or delivering, i.e. used for extracorporeal circuit treatment} - A61M 2025/0034: {characterized by elements which are assembled, connected or fused, e.g. splittable tubes, outer sheaths creating lumina or separate cores} - A61M 2025/0037: {characterized by lumina being arranged side-by-side} - 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)} - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) ## Abstract A catheter includes: a catheter body defining: a first lumen communicating with a first distal opening, and a second lumen communicating with a second distal opening. The second distal opening is positioned proximal of the first distal opening. A flow path cross-sectional area of the first lumen in at least a part of a distal region of the catheter body that is distal of the second distal opening is larger than a flow path cross-sectional area of the first lumen in a proximal region of the catheter body that is proximal of the second distal opening. ## Claims ### Claim 1 A method of using a catheter, the method comprising: providing the catheter, which comprises: a catheter body defining: a first catheter portion defining a first lumen communicating with a first distal opening, and a second catheter portion defining a second lumen communicating with a second distal opening, wherein the second distal opening positioned proximal of the first distal opening, wherein a flow path cross-sectional area of the first lumen in at least a part of a distal region of the catheter body that is distal of the second distal opening is larger than a flow path cross-sectional area of the first lumen in a proximal region of the catheter body that is proximal of the second distal opening, wherein the catheter body includes a tubular body having an outer circumferential surface that is recessed radially inward to form a groove portion, and wherein a first part of the groove portion is covered by a covering member and a second part of the groove portion is exposed from the covering member to form the second distal opening; and positioning the catheter in a blood vessel of an individual such that the second distal opening is located at a position in an arm of the individual, and the first distal opening is located at a position at or near a central vein of the individual; infusing a first infusion solution into the blood vessel at the position at or near the central vein of the individual via the first distal opening; and infusing a second infusion solution into the blood vessel at the position in the arm of the individual via the second distal opening. ### Claim 2 (depends on 1) The method of using a catheter according to claim 1, wherein: a first medical bag storing the first infusion solution is fluidly coupled to the first lumen through a first port; and a second medical bag storing the second infusion solution is fluidly coupled to the second lumen through a second port. ### Claim 3 (depends on 1) The method of using a catheter according to claim 1, wherein: the groove portion causes the second infusion solution to infuse from the second distal opening at an angle relative to an axial direction of the catheter body. ### Claim 4 (depends on 1) The method of using a catheter according to claim 1, wherein: an outer diameter of the catheter body in the proximal region is substantially equal to an outer diameter of the catheter body in the distal region. ### Claim 5 (depends on 1) The method of using a catheter according to claim 1, wherein: an outer diameter of the catheter body in the proximal region is larger than an outer diameter of the catheter body in the distal region. ### Claim 6 (depends on 1) The method of using a catheter according to claim 1, wherein: a cross-sectional shape of the first lumen in a cross-section orthogonal to an axial direction of the first lumen is a non-circular shape in the proximal region and is a circular shape in the distal region. ### Claim 7 (depends on 6) The method of using a catheter according to claim 6, wherein: the non-circular shape is a crescent shape. ### Claim 8 (depends on 1) The method of using a catheter according to claim 1, wherein: at least a portion of the distal region of the catheter body is flexible. ### Claim 9 (depends on 1) The method of using a catheter according to claim 1, wherein: the first catheter portion and the second catheter portion are separable; and the method further comprises, before positioning the catheter in a blood vessel, separating part of the second catheter portion from the first catheter portion and trimming the second catheter portion. ### Claim 10 (depends on 9) The method of using a catheter according to claim 9, wherein: a fragile portion that allows for separation is located at a boundary between the first catheter portion and the second catheter portion. ### Claim 11 (depends on 1) The method of using a catheter according to claim 1, wherein: a hardness of the second catheter portion is greater than a hardness of the first catheter portion. ### Claim 12 (depends on 1) The method of using a catheter according to claim 1, wherein: the covering member comprises a sheet of resin.