# US 12,109,375 B2 · Reuse prevention safety catheter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,109,375 B2 - Document ID: US12109375B2 - Status: Granted - Kind: B2 - Application number: 17/053,227 - Filed: 2019-09-30 - Published: 2023-03-30 - Granted: 2024-10-08 - Earliest claimed: 2019-07-15 - Assignees: Medifirst Co., Ltd. - Applicants: Medifirst Co., Ltd. - Inventors: Kwon Cheul Ko; Chi Jeong An - Web page: https://patentgrep.com/patent/US12109375B2 ## CPC - A61M 25/0631: {having means for fully covering the needle after its withdrawal, e.g. needle being withdrawn inside the handle or a cover being advanced over the needle} - A61M 5/50: having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile {(retractable needles or needle protectors with means for preventing re-use A61M5/321)} - A61M 25/0097: {characterised by the hub (tube connectors or tube couplings A61M39/10)} - A61M 2005/1585: {Needle inserters} - A61M 2205/273: preventing reuse, e.g. of disposables - 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 reuse prevention safety catheter is proposed. The reuse prevention safety catheter includes: a catheter hub having an external needle disposed therein; a cannula plug having an internal needle inserted and penetrated into the catheter hub disposed therein to introduce the external needle into a blood vessel and be separated from the catheter hub; and a locking guide unit having a through-hole configured to allow the internal needle to pass through, wherein the through-hole is deformed when the penetrated internal needle is withdrawn, such that re-penetration of the internal needle is blocked. ## Claims ### Claim 1 A reuse prevention safety catheter, the catheter comprising: a catheter hub having an external needle disposed on the catheter hub; a cannula plug having an internal needle insertable and penetrable into the catheter hub and disposed on the cannula plug to introduce the external needle into a blood vessel and to be separated from the catheter hub; and a locking guide unit having a through-hole configured to allow the internal needle to pass through, wherein the through-hole is deformed when the internal needle is withdrawn, such that re-penetration of the internal needle is blocked, wherein the locking guide unit comprises a first locking guide and a second locking guide, each of the first locking guide and the second locking guide having a truncated conical shape with an eccentric center of gravity and configured such that when the internal needle is withdrawn from the through-hole, an inclination in the first locking guide and the second locking guide is generated within an angular range of greater than 0° and less than 90° by gravity to change a position of the through-hole, wherein the first locking guide and the second locking guide each have a gradually decreasing diameter at respective ends of the first locking guide and the second locking guide, and wherein the second locking guide is located distal to the first locking guide, and the first locking guide and the second locking guide are symmetrically disposed with the respective ends of the first locking guide and the second locking guide opposite each other so that when the internal needle is first withdrawn from the second locking guide, the end of the second locking guide is lowered so that a symmetrical disposition becomes a staggered disposition and a path of the through-hole is changed. ### Claim 2 (depends on 1) The catheter of claim 1, further comprising: a slide casing configured to be extended from the cannula plug to cover the internal needle, wherein the locking guide unit is disposed at a front end part of the slide casing. ### Claim 3 (depends on 2) The catheter of claim 2, wherein the slide casing comprises a holder configured to be hooked by a finger to enable a user to separate the cannula plug from the catheter hub, wherein the locking guide unit is disposed in the holder. ### Claim 4 (depends on 1) The catheter of claim 1, further comprising: a blood blocking unit disposed in the catheter hub to block backflow of blood. ### Claim 5 (depends on 1) The catheter of claim 1, wherein the locking guide unit is an injection-molded part independent of the cannula plug and maintains a locked state in the cannula plug by the internal needle, wherein when a locking force is removed as the internal needle is withdrawn, the inclination is generated in the locking guide unit, such that the position of the through-hole is changed. ### Claim 6 (depends on 1) The catheter of claim 1, wherein a locking force of the first locking guide and the second locking guide is removed when the internal needle is withdrawn, such that the inclination is generated in the first locking guide and the second locking guide, respectively, and a longitudinal hollow path formed by the through-hole of the locking guide unit is collapsed by misalignment of the first locking guide and the second locking guide. ### Claim 7 (depends on 1) The catheter of claim 1, further comprising: a spring providing elastic force pushing the cannula plug from the catheter hub, wherein the spring pushes the cannula plug from the catheter hub to completely extend the internal needle from the locking guide unit.