# US 10,765,837 B2 · Method and device for sheathless arterial catheterization > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,765,837 B2 - Document ID: US10765837B2 - Status: Granted - Kind: B2 - Application number: 14/868,988 - Filed: 2015-09-29 - Published: 2016-03-31 - Granted: 2020-09-08 - Earliest claimed: 2014-09-30 - Assignees: Cardinal Health Switzerland 515 GmbH - Applicants: Cordis Corporation - Inventors: Kintur A. Sanghvi - Web page: https://patentgrep.com/patent/US10765837B2 ## CPC - A61M 25/09041: {Mechanisms for insertion of guide wires} - A61M 29/00: Dilators with or without means for introducing media, e.g. remedies - A61M 29/02: Dilators made of swellable material {(balloon catheters for angioplasty A61M25/104)} - A61M 2025/0183: {Rapid exchange or monorail catheters} - 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 A dilator for sheathless access to a vessel of a patient, having a distal portion with a maximal outer diameter that extends from a distal end to a guidewire exit port and a proximal portion with a reduced profile that extends from the guidewire exit port to the proximal end and a lumen that extends between the distal end and the guidewire exit port. A first guidewire may be positioned within the vessel and the dilator advanced over the guidewire. A guide catheter may then be advanced over the dilator. ## Claims ### Claim 1 A kit for gaining access to a vessel of a patient, comprising: a first dilator having an elongated body with proximal and distal ends, a distal portion with a maximal outer diameter having a cylindrical configuration that extends from the distal end to a guidewire exit port, a proximal portion with a reduced profile having a semi-cylindrical configuration that extends from the guidewire exit port to the proximal end and a lumen defined by an inner wall that extends between the distal end and the guidewire exit port, wherein a portion of the inner wall continues to extend through the proximal portion; and a second dilator having an elongated body with proximal and distal ends, a distal portion with a maximal outer diameter having a cylindrical configuration that extends from the distal end to a guidewire exit port, a proximal portion with a reduced profile having a semi-cylindrical configuration that extends from the guidewire exit port to the proximal end and a lumen defined by an inner wall that extends between the distal end and the guidewire exit port, wherein a portion of the inner wall continues to extend through the proximal portion; wherein the first dilator is configured to be inserted into a radial artery, and the second dilator is configured to be inserted into the radial artery upon removal of the first dilator; wherein the lumen of the first dilator has a smaller inner diameter than the lumen of the second dilator; and wherein the maximal outer diameter distal portion of the first dilator has an outer diameter the same as the maximal outer diameter distal portion of the second dilator. ### Claim 2 (depends on 1) The kit of claim 1, wherein the maximal outer diameter of the first dilator is about 1.80 mm. ### Claim 3 (depends on 1) The kit of claim 1, further comprising a marker positioned on the proximal portion of the first dilator. ### Claim 4 (depends on 1) The kit of claim 1, wherein the lumen of the first dilator has a diameter of about 0.58 mm and the lumen of the second dilator has a diameter of about 0.88 mm. ### Claim 5 (depends on 1) The kit of claim 1, wherein the reduced profile proximal portion of the first dilator has a cross sectional area at least 40% smaller than a cross sectional area of the maximal outer diameter distal portion of the first dilator. ### Claim 6 (depends on 5) The kit of claim 5, wherein the reduced profile proximal portion of the first dilator has a cross sectional area at least 50% smaller than a cross sectional area of the maximal outer diameter distal portion of the first dilator. ### Claim 7 (depends on 1) The kit of claim 1, wherein the semi-cylindrical configuration of the proximal portion of the first dilator is configured to receive a guidewire therein and the cylindrical configuration of the distal portion of the first dilator is configured to receive the guidewire in the lumen therein. ### Claim 8 (depends on 1) The kit of claim 1, wherein the maximal outer diameter of the second dilator is about 1.80 mm. ### Claim 9 (depends on 1) The kit of claim 1, wherein the distal end of the first dilator is tapered. ### Claim 10 (depends on 9) The kit of claim 9, wherein the tapered distal end of the first dilator has a hydrophilic coating. ### Claim 11 (depends on 1) The kit of claim 1, wherein the distal end of the second dilator is tapered. ### Claim 12 (depends on 11) The kit of claim 11, wherein the tapered distal end of the second dilator has a hydrophilic coating. ### Claim 13 (depends on 1) The kit of claim 1, wherein the first and second dilators are formed from a polymeric material. ### Claim 14 A method for gaining access to a radial artery of a patient, comprising: providing a first dilator having an elongated body with proximal and distal ends, a distal portion with a maximal outer diameter having a cylindrical configuration that extends from the distal end to a guidewire exit port, a proximal portion with a reduced profile having a semi-cylindrical configuration that extends from the guidewire exit port to the proximal end and a lumen that extends between the distal end and the guidewire exit port; positioning a first guidewire within the radial artery of the patient; advancing the first dilator over the first guidewire into the radial artery without being inserted through a sheath; advancing a first guide catheter over the first dilator; removing the first dilator; providing a second dilator having an elongated body with proximal and distal ends, a distal portion with a maximal outer diameter having a cylindrical configuration that extends from the distal end to a guidewire exit port, a proximal portion with a reduced profile having a semi-cylindrical configuration that extends from the guidewire exit port to the proximal end and a lumen that extends between the distal end and the guidewire exit port; and introducing the second dilator through the first guide catheter and positioning a distal end of the second dilator at a desired region of the radial artery, wherein the lumen of first dilator has a smaller inner diameter than a lumen of the second dilator; wherein the maximal outer diameter distal portion of the first dilator has an outer diameter the same as the maximal outer diameter distal portion of the second dilator. ### Claim 15 (depends on 14) The method of claim 14, further comprising preloading the first dilator into the first guide catheter before advancing the first dilator. ### Claim 16 (depends on 14) The method of claim 14, further comprising introducing a second guidewire through the first guide catheter and positioning a distal end of the second guidewire at a desired region of the radial artery, wherein the second guidewire has a larger diameter than the first guidewire. ### Claim 17 (depends on 16) The method of claim 16, further comprising performing at least a portion of a procedure with the first guide catheter. ### Claim 18 (depends on 17) The method of claim 17, further comprising: withdrawing the first guide catheter; advancing the second dilator over the second guidewire into the vessel without being inserted through a sheath; advancing a second guide catheter over the second dilator; and removing the second dilator. ### Claim 19 (depends on 18) The method of claim 18, further comprising preloading the second dilator into the second guide catheter before advancing the first dilator. ### Claim 20 (depends on 19) The method of claim 19, further comprising performing at least a portion of the procedure with the second guide catheter.