# US 8,771,235 B2 · Syringe device with protective cap > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,235 B2 - Document ID: US8771235B2 - Status: Granted - Kind: B2 - Application number: 12/254,266 - Filed: 2008-10-20 - Published: 2009-04-23 - Granted: 2014-07-08 - Earliest claimed: 2007-10-23 - Assignees: Tech Group Europe Limited - Applicants: Stéphane Chevallier; Jean-Michel Chevallier - Inventors: Stéphane Chevallier; Jean-Michel Chevallier - Web page: https://patentgrep.com/patent/US8771235B2 ## CPC - A61M 5/3202: {Devices for protection of the needle before use, e.g. caps (A61M5/50 takes precedence; protectors for sharps A61B50/3001)} - A61M 5/326: {Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user} - A61M 5/5086: {for indicating if defective, used, tampered with or unsterile} - A61M 2005/3261: {triggered by radial deflection of the anchoring parts between sleeve and syringe barrel, e.g. spreading of sleeve retaining hooks having slanted surfaces by engagement with conically shaped collet of the piston rod during the last portion of the injection stroke of the plunger} - A61M 2005/3264: {Trigger provided at the proximal end, i.e. syringe end opposite to needle mounting end} - 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 invention comprises a syringe body (10) having a distal end (10B) fitted with an injection needle (14), at least one sheath (16, 18) inside which the body is positioned, and a protective cap (40) able to be retained relative to the syringe body (10) to cover the needle (14) and be separate from this body to release the needle. The device comprises a non-return unit (50) able to oppose a refitting of the cap (40) in its protection position once the needle has been released. This non-return unit, for example, comprises an elastic lip (50) joined to the sheath or the cap. ## Claims ### Claim 1 A syringe device comprising: a syringe body having a distal end fitted with an injection needle; at least one sheath inside which the syringe body is positioned; a protective cap having: (i) a protection position, wherein the cap is retained relative to the syringe body such that a distal end of the cap is located at a shortest distance, as measured along a longitudinal axis of the needle, from a distal end of the needle so as to cover the needle, movement of the distal end of the cap with respect to the distal end of the needle from the protection position being limited to a distal direction along the longitudinal axis, and (ii) a free state, wherein the cap is separated from the syringe body to release the needle; and an elastic lip joined to the sheath and which forms a closed ring having a free end, the lip being elastically constrained wherein the free end defines a first diameter when the cap is in the protection position and defines a second diameter in the free state, the second diameter being smaller than the first diameter to oppose refitting of the cap in the protection position once the needle has been released, wherein in both the protection position and the free state, the free end of the elastic lip is located distally of the joint of the elastic lip with the sheath. ### Claim 2 (depends on 1) The device as claimed in claim 1, wherein, in the protection position, the cap cooperates by press-fitting with the distal end of the sheath. ### Claim 3 (depends on 2) The device as claimed in claim 2, wherein the elastic lip is joined to a distal end portion of the sheath and the free end, when the cap is in its protection position, bears against the external periphery of the cap, whereas, in the free state of the elastic lip, said free end delimits diametral dimensions less than diametral dimensions of the external periphery of the cap. ### Claim 4 (depends on 3) The device as claimed in claim 3, wherein the free end of the elastic lip is thinned. ### Claim 5 (depends on 1) The device as claimed in claim 1, wherein the sheath is a protection sleeve, the syringe body and the protection sleeve being able to slide relative to each other, so as to occupy a waiting position, in which a free end of the needle extends beyond the sheath and a protection position in which the sheath is positioned around the free end of the needle. ### Claim 6 (depends on 1) The device as claimed in claim 1, comprising a support sleeve relative to which the syringe body is retained, and a protection sleeve, the syringe body and the protection sleeve being able to slide relative to each other, so as to occupy a waiting position in which the free end of the needle extends beyond the protection sleeve and a protection position in which said sleeve is positioned around the free end of the needle. ### Claim 7 (depends on 6) The device as claimed in claim 6, wherein the sheath is formed by one of the elements comprising the support sleeve and the protection sleeve.