Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/31—Details
  • A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S215/00—Bottles and jars
  • Y10S215/03—Medical

Definitions

• the present invention relates to a sealing device intended in particular, but not exclusively, for injection cartridges or cartridges containing in particular anesthetics.
• cartridges intended to be mounted on a syringe consist of a small tube, generally made of glass, the bottom of which comprises a movable piston intended to expel the liquid in a hollow needle.
• the front part of the cartridge is closed by a rubber seal or shutter which will be crossed by the needle, secured to the tube by means of a ring or metal ring crimped on the front of the tube .
• AU-A-603 862 describes a crown having the role of centering the rubber membrane.
• a collar causes the deformation of a rubber block ensuring the front closure of the glass tube.
• a flange has a section at an acute angle but neither its function nor the dimension ratios with the tube are defined.
• the object of the invention is to overcome the drawback indicated above even in the case of high pressure applied and to allow injections without leakage, even when significant pressures are necessary, for example in the case of intradiploic, intraligamentary injections. , intraseptales, intrapalatines, etc. It is based on the idea that to ensure sealing under high pressure it is necessary to obtain compression of a flexible membrane between two edges of non-deformable parts.
• the sealing device of a syringe in which a cartridge is inserted, closed at its upper part by a flexible obturator, connected to an injection needle is characterized in that the connecting piece between 1 'needle and the front part of the cartridge has a projecting crown whose diameter is substantially equal to the diameter of one opening of the cartridge coming to bear against 1) flexible shutter to press it against the inner edge of the upper surface of the cartridge .
• the connecting piece between the needle and the cartridge can be either an adapter for mounting the needle on a syringe or needle holder, or the piece overmolded plastic surrounding the needle itself.
• the needle holder integrated in the front part by molding, can have the same arrangement.
• FIG. 1 shows the top of an anesthetic cartridge 1, for example made of glass of known type. It has a flat upper edge 2 against which rests a flexible shutter 3 made of rubber, neoprene or the like. The shutter 3 is held against the surface 2 by a metal ring 5, the lower part of which is crimped into a groove 4 of the cartridge 1. The upper central orifice 6 of the cartridge 1 is thus closed by the shutter 3. L 'hollow needle not shown in Figure 1 through the shutter to lead the liquid to the injection point.
• the present invention aims to establish a sealed connection in the vicinity of the edge 7 of the upper surface 2 of the cartridge.
• the needle is mounted in a needle holder such as that shown in the Figure 2.
• the needle is inserted into the needle holder 8 on which it is generally screwed onto the thread 16 and the needle holder is then slid on one before the syringe where it is held by friction.
• the sliding of the needle holder causes the needle to pass through the shutter 3.
• the reference 10 represents the passage channel of the needle itself.
• the lower skirt 11 of the needle holder has gadroons 12 which facilitate the sliding of the needle holder on the cartridge and ensure an effective mechanical connection.
• the needle holder 8 has below the channel 10 a projecting crown 9 whose diameter is substantially equal to the diameter of one orifice 6 of the cartridge 1 and whose height is, for example 1 , 5 millimeter.
• this sealing ring 9 presses on a shutter of the same dimension on the shutter 3 so that the latter takes the shape shown in the figure before an injection. That is to say that the central part of the shutter 3 takes the form of a biconvex lens. This deformation presses the shutter against the internal edge 7 of the cartridge 1 and against a ring of the internal part of the edge 2. A sealing zone is thus formed which prevents any leakage.
• the needle was mounted on the cartridge by means of a needle holder 8.
• the needle itself is usually surrounded by a molded plastic part which allows its fixing in the needle holder without it must be touched with the hand.
• the present invention can also be implemented when the needle is mounted directly on the cartridge.
• a needle is shown in Figure 3. It has a hollow metal channel 13 on which is molded a piece 14 of plastic.
• the mounting piece 14, the front of which is frustoconical, has a slightly conical lower skirt 15, provided with gadroons 12 allowing the skirt 15 to slide against the external wall of the cartridge 1.
• the skirt is not fitted with an internal thread which, in the previous embodiment made it possible to subject the needle to the thread 16 of the needle holder 8.
• the part 14 includes a sealing ring 9 which plays the same role as in the previous example.

Applications Claiming Priority (3)

Publications (1)

Family

ID=9528208

Family Applications (1)

Country Status (5)

Families Citing this family (9)

Family Cites Families (26)

• 1998
  • 1998-07-03 FR FR9808503A patent/FR2780653B1/fr not_active Expired - Fee Related
• 1999
  • 1999-02-07 US US09/486,874 patent/US6354603B1/en not_active Expired - Fee Related
  • 1999-07-02 JP JP2000557876A patent/JP2002519157A/ja active Pending
  • 1999-07-02 WO PCT/FR1999/001588 patent/WO2000001430A2/fr not_active Application Discontinuation
  • 1999-07-02 EP EP99926584A patent/EP1047463A2/de not_active Withdrawn

Non-Patent Citations (1)

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