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
  • A61M5/31—Details
  • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
  • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
  • A61M5/321—Means for protection against accidental injuries by used needles
  • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
  • A61M5/326—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
• • 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
  • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
  • A61M5/2033—Spring-loaded one-shot injectors with or without automatic needle insertion
• • 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
  • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
  • A61M2005/206—With automatic needle insertion
• • 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
  • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
  • A61M2005/2073—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically preventing premature release, e.g. by making use of a safety lock
• • 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
  • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
  • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
  • A61M5/321—Means for protection against accidental injuries by used needles
  • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
  • A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
  • A61M2005/3247—Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
• • 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
  • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
  • A61M5/3202—Devices for protection of the needle before use, e.g. caps

Definitions

• the application relates to a device for injecting an active substance, with an injection needle, a housing, a container for the active substance and a syringe plunger which is displaceable in the container for the purpose of dispensing the active substance and with a needle guard which can be displaced relative to the housing.
• a needle guard of the type mentioned is known in many designs, both in connection with manually operated syringes and in so-called auto-injectors.
• Document W09714455 describes an auto-injector with a needle-protecting sleeve which can be moved in a housing and which rests on the patient's skin during the injection and is biased by a spring such that the needle-protecting sleeve pushes forward relative to the auto-injector when it is pulled back and covers the injection needle , Effective locking means between the needle protection and the housing ensure that the needle protection sleeve cannot be pushed back again and thus there can be no unwanted injury from the injection needle. Means to release the lock are not disclosed in this document.
• the needle guard remains in a position which is essentially constant relative to the housing, and in the process a spring element is tensioned, which pushes the needle guard into a position surrounding the needle after removal of the injection needle from the skin.
• a special embodiment of the invention is characterized in that the container is accommodated in a sliding sleeve which is displaced in the housing from a retracted position into an advanced position during skin penetration, that the needle guard is automatically locked in its advanced position by locking means, which locking means are arranged and designed such that they act between the needle guard and the sliding sleeve when the needle guard and the sliding sleeve are in their advanced position and that there are means for releasing the locking means which take effect when the sliding sleeve is at least approximately in their retracted position.
• the needle guard is therefore not locked against the housing as in many known devices of this type, but the sliding sleeve and the means for releasing the locking only become effective when the sliding sleeve is at least approximately in its retracted position. This has the considerable advantage that the injection needle is already back in the housing when the lock is released. This ensures that the injection needle cannot be touched unintentionally in any operating state of the auto-injector.
• the locking means have at least one essentially axially aligned spring tongue which is arranged on the sliding sleeve and which in its relaxed state forms an axial stop with a region of the needle guard and the means for releasing the locking have one in the housing arranged, inwardly projecting projection, which presses the spring tongue radially inward in the retracted position of the sliding sleeve, such that the part of the sliding sleeve containing the spring tongue can move into the area of the needle guard.
• a spring element which urges the needle guard into its advanced position and which is tensioned by the sliding sleeve when it moves into its advanced position.
• Another embodiment of the invention provides that there are entraining means which cause the needle guard to be taken along by the sliding sleeve when it is moved from its advanced position into the retracted position. This eliminates the need to manually push the needle guard back into the housing after unlocking. If, in addition, a return spring element is provided, which applies a restoring force to the sliding sleeve in the direction of its retracted position, both the sliding sleeve and the needle guard automatically assume the retracted starting position when the driving force ceases.
• FIG. 1 shows a longitudinal section through an exemplary embodiment of an auto-injector according to the invention in the charged state
• FIG. 2 shows a longitudinal section through the same auto-injector after inserting the injection needle and pouring out the medicament, the cutting plane being offset by 90 ° with respect to that of FIG. 1,
• FIG. 3 shows a longitudinal section through the same auto-injector after pulling out the injection needle, cut in the same plane as the illustration according to FIG. 1, and
• the auto-injector consists of two main components, namely the reservoir part, shown on the left in the figures, which holds a filled syringe 50 and the power pack, shown on the right in the figures, in which the parts which are used for automatically inserting and dispensing the syringe are accommodated are.
• the two main components are detachably connected to one another by a bayonet-like connection between a housing 16 and a power sleeve 1.
• the side of the auto-injector on which the injection needle 37 is located is referred to as the front.
• FIG. 1 shows the ready-to-use auto injector.
• the parts for driving the auto injector are accommodated in the grip sleeve 14, at the rear end of which a display window 51 connects.
• the display window 51 is, for example, made of transparent or translucent material, so that the display 12 slidably received in the display window 51 can be observed from the outside.
• the display 12 allows the user to visually track the process of dispensing the medication.
• the actuating head 13 is arranged, which is provided on its rear face with a cover plate 15.
• the power sleeve 1 is received within the grip sleeve 14.
• the power sleeve 1 is connected to a grid sleeve 8 by means of a snap connection.
• the grid sleeve 8 receives a spring sleeve 10 slidably on the inside.
• the spring sleeve 10 is coupled to the display 12 at the rear by a snap connection.
• the transmission part 5 is slidably mounted in the power sleeve 1.
• the transfer part 5 has the task of actuating the piston rod 52 of the syringe 50 in order to pour out the contents of the syringe, as will be described in more detail later.
• a spring 9 is accommodated in the tensioned state within the spring sleeve 10, which is supported on the spring sleeve 10 at the front and presses against the grid sleeve 8 at the rear.
• a second spring 11 is also located in the tensioned state on the outside of the spring sleeve 10 and is supported at the front on the transmission part 5 and presses against the spring sleeve 10 at the rear.
• a part referred to as the piston guide 4 rests with its front, sleeve-shaped, slotted end 4 ′ on the collar of the syringe 50 and extends through the transmission part 5, the spring sleeve 10 and the grid sleeve 8 into the area of the actuating head 13.
• the piston guide 4 is biased forward by a spring 7 which is supported on the grid sleeve 8 at the rear. At its rear end, the piston guide 4 is held in the position shown in FIG. 1 by two locking cams 31 formed on the grid sleeve 8 and engaging in a groove 32 formed on the rear end of the piston guide 4.
• Locking elements for example balls 6 (only visible in FIG. 2), which are received in radial openings 33 of the piston guide 4 and engage in recesses 34 in the transmission part 5, ensure in this operating position that the transmission part 5 and the piston guide 4 only move together can.
• balls 6 instead of balls 6, other bodies can also be used as locking elements, for example bolts.
• the syringe 50 is accommodated in the housing 16, which can be connected to the power sleeve 1 as described.
• a sliding sleeve 21 accommodates the syringe 50 with the interposition of a needle holder 22 (FIG. 2).
• the needle holder 22 prevents the injection needle 37 from being pulled off the syringe as long as the latter is in the auto-injector.
• the needle holder 22 lies against a support ring 24 connected to the sliding sleeve 21 at the front.
• the sliding sleeve 21 is displaceable within the housing 16 and is forced into the operating position shown in FIG. 1 by a spring 20.
• the spring 20 which is in its only slightly pretensioned state in the operating position according to FIG. 1, is supported at the front on a circumferential, inner shoulder 39 of the housing 16 and at the rear on an outwardly projecting rim of the sliding sleeve 21.
• a sleeve-shaped needle guard 17 is slidable within the housing 16.
• the needle guard 17 is closed at the front by a snap cover 23, which leaves a passage for the injection needle 37 and has an inwardly facing flange 35 at its rear end.
• a spring 18 is supported at the front on the snap cover 23 and at the back on a driving ring 19, which in turn is supported on the flange 35 in the operating position according to FIG. 1. Consequently, the spring 18 has no effect in the operating position according to FIG. 1, in which it is only slightly pretensioned, because its remaining pretensioning force is absorbed by the needle guard 17.
• the auto-injector must be unlocked before the injection can be triggered.
• the actuating head 13 is moved backwards. At the front edge of the actuating head 13, an area of the display window 51 is cleared, on the inside of which a conspicuously colored warning sleeve 53 is visible, which clearly indicates that the auto-injector is now unlocked and ready for injection.
• tongues 36 which are integrally formed on the cover plate 15 of the actuating head 13, move over the latching cams 31 formed on the grid sleeve.
• the tongues 36 and the latching cams 31 are shaped in such a way that the tongues 36 yield radially resiliently while sliding over the ends of the locking cams 31, which hold the piston guide 4 by engaging in the grooves 32 mentioned.
• the tongues 36 formed on the actuating head 13 stand like wedges between the locking cams 31.
• the auto-injector is now ready for injection and is placed on the patient's skin at the desired location with the snap cover 23. Since the needle guard 17 has an axial play in the housing 16, it pushes backwards when it is placed on the skin until the flange 35 abuts the shoulder 39. The patient holds the auto-injector firmly on the grip sleeve 14 and moves the actuating head 13 forward, that is, in the direction towards his body. During this release movement, the tongues 36 penetrate between the locking cams 31 and spread them apart radially, as a result of which the piston guide 4 is released and pushed forward by the force of the spring 7. The piercing movement is also supported by the force of the springs 9 and 11, which act on the transmission part 5.
• a spring system is formed, consisting of the springs 7, 9 and 11 with a relatively high initial force, which contributes to the injection needle being reliably advanced to the full penetration depth .
• the force of the springs is transmitted via the sleeve-shaped front end 4 'of the piston guide 4 to the collar of the syringe 50 and pushes it together with the sliding sleeve 21 in which it is received in front, so that the injection needle 37 is advanced and penetrates the patient's skin.
• the front end of the sliding sleeve 21 moves into the needle guard 17, the spring tongues 38 provided on it driving the driving ring 19 and thus tensioning the spring 18.
• the sliding sleeve 21 also compresses the spring 20.
• the penetration stroke is limited by the shoulder 40 of the piston guide 4 resting on an inner shoulder 41 of the power sleeve 1.
• the openings 33 in the piston guide 4, which receive the balls 6, are aligned with recesses 42, which are provided in the power sleeve 1, the balls 6 can deflect outwards and the coupling between the piston guide 4 and the transmission part 5 is canceled.
• the piston guide 4 is now locked against the power sleeve 1, so that the force of the spring 20 is absorbed by the power sleeve and does not counteract the force of the spring 7.
• FIG. 2 shows the operating position of the auto-injector just described, in which the medicament has been completely poured out, as can be seen in the figure on the basis of the position of the piston rod of the syringe 50.
• the user can clearly recognize this operating position on the basis of the position of the display 12 in the display window 51.
• the reference number 57 denotes the body tissue of the patient in which the injection needle 37 is still inserted.
• the user can now withdraw the auto-injector, which changes into the operating position shown in FIG. 3.
• the spring 18, which was pretensioned during the puncturing process as described, ensures that the needle guard 17 remains in contact with the patient's skin during the retraction of the auto-injector.
• the needle guard 17 moves forward relative to the housing 16 and the sliding sleeve 21 until it completely covers the injection needle 37.
• the spring tongues 38 snap behind the flange 35 of the needle guard 17 and prevent it from being pushed back into the housing 16, as can be clearly seen in FIG. 3. This means that every further wanted injury from the hypodermic needle to be eliminated.
• Small hooks 58 (FIG.
• FIG. 4 shows the reservoir part in this operating position, in which the used syringe 50 can now be removed and replaced by a new one.

Landscapes

• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Hematology (AREA)
• Anesthesiology (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Vascular Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Environmental & Geological Engineering (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=32331828

Family Applications (1)

Country Status (6)

Families Citing this family (133)

Family Cites Families (21)

• 2003
  • 2003-11-17 CN CN200380103982.7A patent/CN100506305C/zh not_active Expired - Fee Related
  • 2003-11-17 JP JP2004554139A patent/JP4339260B2/ja not_active Expired - Fee Related
  • 2003-11-17 WO PCT/CH2003/000757 patent/WO2004047892A1/de active Application Filing
  • 2003-11-17 AU AU2003280270A patent/AU2003280270B2/en not_active Ceased
  • 2003-11-17 EP EP03770836A patent/EP1572270A1/de not_active Withdrawn
• 2005
  • 2005-05-23 US US11/135,602 patent/US7361160B2/en not_active Expired - Fee Related
• 2007
  • 2007-11-30 US US11/948,014 patent/US20080071225A1/en not_active Abandoned

Non-Patent Citations (1)

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