# US 2018/0021519 A9 · Plunger Covers and Plungers For Use In Syringes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0021519 A9 - Document ID: US20180021519A9 - Status: Published application - Kind: A9 - Application number: 14/576,354 - Filed: 2014-12-19 - Published: 2018-01-25 - Earliest claimed: 2006-03-15 - Assignees: Bayer HealthCare LLC - Applicants: Bayer Healthcare LLC - Inventors: Joseph E. Bisegna; Jared E. Neff - Web page: https://patentgrep.com/patent/US20180021519A9 ## CPC - A61M 5/31513: {Piston constructions to improve sealing or sliding} - A61M 5/31515: {Connection of piston with piston rod} - 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 plunger cover for use with a syringe includes a sealing portion adapted to form a seal with the syringe and a central portion adapted to contact fluid within the syringe. The central portion can, for example, be more rigid than the sealing portion. The sealing portion and the central portion are connected in an overmolding process. The sealing portion can, for example, be formed from a thermoplastic elastomer or a thermoplastic polyurethane. The central portion can, for example, be formed from polypropylene, acrylonitrile butadiene styrene, polycarbonate or copolymers thereof. ## Claims ### Claim at position 1 1-28. (canceled) ### Claim 29 A plunger cover for use with a syringe comprising: a sealing portion adapted to form a seal with the syringe; and a central portion adapted to contact a fluid within the syringe, the central portion being more rigid than the sealing portion, the sealing portion and the central portion being connected in an overmolding process, wherein the sealing portion is injection molded first and the central portion is injection overmolded thereon, wherein the central portion comprises a conical hollow portion, wherein the sealing portion comprises a conical central section, wherein the sealing portion and the central portion are overmolded such that the conical central section and the conical hollow portion are coextensively connected to form a multilayer conical portion of the plunger cover, and wherein the plunger cover contains colorant. ### Claim 30 (depends on 1) The plunger cover of claim 1, wherein the colorant is contained in the sealing portion, the central portion, or combinations thereof. ### Claim 31 (depends on 1) The plunger cover of claim 1, wherein the sealing portion is formed from a thermoplastic elastomer or a thermoplastic polyurethane. ### Claim 32 (depends on 1) The plunger cover of claim 1, Wherein the central portion is formed from polypropylene, acrylonitrile butadiene styrene or polycarbonate. ### Claim 33 (depends on 1) The plunger cover of claim 1, wherein a material for the sealing portion is a first material and a material for the central portion is a second material, the first material and the second material are different and are selected so that molecular bonding occurs between the sealing portion and the central portion. ### Claim 34 (depends on 1) The plunger cover of claim 1, wherein the central portion is positioned forward of at least a portion of the sealing portion., ### Claim 35 (depends on 1) The plunger cover of claim 1, wherein the sealing portion is shaped to not contact Fluid within the syringe. ### Claim 36 (depends on 1) The plunger cover of claim 1, wherein the sealing portion comprises an inwardly projecting flange seated in a seating formed in a support ring. ### Claim 37 A plunger for use with a syringe comprising: a plunger cover comprising a sealing portion adapted to form a seal with the syringe and a central portion adapted to contact a fluid within the syringe, the central portion being more rigid than the sealing portion, the sealing portion and the central portion being connected in an overmolding process; and a support ring attached to the plunger cover, wherein the support ring has a forward surface shaped to contact and mate with a rearward surface of the plunger cover, wherein the central portion of the plunger cover comprises a conical hollow portion, wherein the sealing portion of the plunger cover comprises a conical central section, wherein the sealing portion and the central portion are overmolded such that the conical central section and the conical hollow portion are coextensively connected to form a multilayer conical portion of the plunger cover, and wherein the plunger contains colorant. ### Claim 38 (depends on 9) The plunger of claim 9 wherein the colorant is contained in the central portion, the sealing portion, the support ring, or combinations thereof. ### Claim 39 (depends on 9) The plunger of claim 9, wherein the sealing portion is formed from a thermoplastic elastomer or a thermoplastic polyurethane. ### Claim 40 (depends on 9) The plunger of claim 9, wherein the central portion is formed from polypropylene, acrylonitrile butadiene styrene or polycarbonate. ### Claim 41 (depends on 9) The plunger of claim 9, wherein a material for the sealing portion is a first material and a material for the central portion is a second. material, the first material and the second material are different and are selected so that molecular bonding occurs between the sealing portion and the central portion. ### Claim 42 (depends on 9) The plunger of claim 9, wherein the sealing portion includes a radially inward projecting flange that is seated within a seating formed on the support ring to connect the plunger cover to the support ring. ### Claim 43 (depends on 9) The plunger of claim 9, wherein the forward surface of the support ring abuts the plunger cover to prevent rearward motion of the central portion of the plunger cover relative to the support ring. ### Claim 44 A syringe comprising: syringe body and a plunger slidably positioned within the syringe body, the plunger comprising a plunger cover comprising: a sealing portion adapted to form a seal with the syringe body; a central portion adapted to contact a fluid within the syringe, the central portion being more rigid than the sealing portion, the sealing portion and the central portion being connected in an overmolding process; and a support ring attached to the plunger cover, wherein the sealing portion is injection molded first and the central portion is injection molded thereon, wherein the support ring has a forward surface shaped to contact and mate with a rearward surface of the plunger cover, wherein the central portion comprises a conical hollow portion, wherein the sealing portion comprises a conical central section, wherein the sealing portion and the central portion are overmolded such that the conical central section and the conical hollow portion are coextensively connected to form a multilayer conical portion of the plunger cover, and wherein the plunger cover contains colorant. ### Claim 45 (depends on 16) The syringe of claim 16, wherein the colorant is contained in the central portion, the sealing portion, the support ring, or combinations thereof.