GB2465919A - Injection device with cap that can be re-fitted post injection - Google Patents

Injection device with cap that can be re-fitted post injection Download PDF

Info

Publication number
GB2465919A
GB2465919A GB1004514A GB201004514A GB2465919A GB 2465919 A GB2465919 A GB 2465919A GB 1004514 A GB1004514 A GB 1004514A GB 201004514 A GB201004514 A GB 201004514A GB 2465919 A GB2465919 A GB 2465919A
Authority
GB
United Kingdom
Prior art keywords
housing
cap
injection
forward end
needle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1004514A
Other versions
GB2465919B (en
GB201004514D0 (en
Inventor
Timothy Simon Evans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Owen Mumford Ltd
Original Assignee
Owen Mumford Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Owen Mumford Ltd filed Critical Owen Mumford Ltd
Priority to GB1004514A priority Critical patent/GB2465919B/en
Publication of GB201004514D0 publication Critical patent/GB201004514D0/en
Publication of GB2465919A publication Critical patent/GB2465919A/en
Application granted granted Critical
Publication of GB2465919B publication Critical patent/GB2465919B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • A61M5/3202—Devices for protection of the needle before use, e.g. caps
    • 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
    • A61M5/31—Details
    • A61M5/3129—Syringe barrels
    • 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
    • A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
    • 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
    • A61M2005/3125—Details specific display means, e.g. to indicate dose setting
    • 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
    • A61M5/3204—Needle cap remover, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices
    • 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
    • A61M5/3213—Caps placed axially onto the needle, e.g. equipped with finger protection guards
    • 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

Abstract

An injection device comprises an elongate housing 101-104, with a forward end 101and a rearward end 103. The housing 101-104receives a syringe 24 or cartridge having a needle 26, which projects from the forward end of the housing 101at least on completion of the injection. A longitudinally removable sheath 30 initially caps the front end of the housing 101. A removable cap 34 is adapted to be fitted to the forward end of the housing 101in either the pre-injection orientation of the post-injection orientation. The cap 34 has a rearwardly extending element 38 which, at its rearward end 40, is adapted to engage behind a base of the removable sheath 30 when the cap is in its pre-injection orientation. Upon removal of the cap 34, the sheath 30 is removed from the needle 26. The cap 34 is further adapted so that it may be re-fitted to the forward end of the housing 101in its post-injection orientation, whereby the rearwardly extending element 38 extends forwardly of the housing 101-104to shroud the needle 26.

Description

Iniection Device This invention relates to injection devices of the type comprising a housing which contains a syringe or cartridge which contains a therapeutic substance for injection into the human or animal body.
Certain therapeutic substances, such as, for example adrenalin, can be degraded by prolonged exposure to light with a result that their therapeutic effect is diminished or lost. Previously this has been overcome by disposing the syringe or cartridge in a housing which is opaque to at least the primary waveband of light responsible for the degradation. Alternatively, the device has itself been stored within an outer container which provides a light shielding or filtering effect. However, the requirement to shield the substance from the light is in direct conflict with a requirement that the user be able to inspect the state of the therapeutic substance within the syringe before making the injection to check firstly that it has not discoloured or leaked out. In the first type of injection device this is not possible and, in the second, it is possible but only at the expense of having to provide a separate outer container.
According to this invention there is provide an injection device comprising an elongate housing for receiving in use a syringe or cartridge, the housing having a forward end and a rearward end, and the syringe or cartridge having a needle which projects from the forward end of said housing at least on completion of the injection process, the needle being initially protected by a longitudinally removable sheath, said device further including a removable cap adapted to be fitted to the forward end of the housing in either of a pre-injection orientation and a post-injection orientation respectively, said cap having a rearwardly extending element adapted to engage at its rearward end behind a base of the removable sheath, when said cap is in its pre-injection orientation, whereby upon removal of said cap from the forward end of said housing, said sheath is removed from said needle, said cap being further adapted so that it may be re-fitted to the forward end of the housing in its post-injection orientation in which the rearwardly extending element of the cap extends forwardly of the housing to shroud said needle.
The rearwardly extending element may be conveniently of generally hollow cylindrical form, with the rearward end thereof including an inwardly directed rib or tooth for engaging behind the base of said sheath. The engagement between the rearwardly extending element and the base of said sheath is preferably resilient whereby the rearward end of said rearwardly extending element may move resiliently past the base of the needle sheath to a position ready to capture the sheath on removal of said cap.
Whilst the invention has been described above, it extends to any inventive combination of the features set out above or in the following
description or claims.
The invention may be performed in various ways, and in an embodiment thereof will now be described by way of example only, reference being made to the accompanying drawings in which: Figure 1 is a side view of an injection device in accordance with this invention prior to injection, with the shutter in its concealing position; Figure 2 is a section view through the device of Figure 1; Figure 3 is a side view of the injection device of Figure 1 but with the shutter retracted to its revealing position; Figure 4 is a cross-sectional view of the arrangement of Figure 3; Figure 5 is a detailed perspective cutaway view of the shutter element and the syringe carrier in the arrangement of Figure 1, but with the syringe removed for clarity; Figure 6 is a cross-sectional view through the injection device of Figure 1 following injection, with the needle exposed, and Figure 7 is a side view of the injection device following injection but with the cap refitted.
The injection device shown in the drawings is intended to be a single use device for administering therapeutic materials such as, for example, adrenalin in the case of anaphylactic shock. The device comprises a generally cylindrical housing 10 made up of a forward section lO, a mid section 102, a rear section 103 and a rear collar 104. Slideably mounted around the outside of the mid-section 102 is a shutter element 12 which is moveable between a forward, concealing position shown in Figures 1 and 2, and a rearward, revealing position as shown in Figures 3 and 4, in which a window 14 provided on the side of the central section 102 is revealed, and through which the contents of a syringe 25 can be viewed.
Referring specifically to Figures 2, 4, 5 and 6, a syringe carrier 16 is slideably mounted within the housing central section 102 between a rearward position shown in Figures 2 and 4, and a forward position shown in Figure 6.
Referring to Figure 5, the syringe carrier 16 is also of generally cylindrical form and is provided with two diametrically opposed slots 18 which receive two radially inwardly projecting abutments 20 on the central section 102 to constrain longitudinal movement of the syringe carrier 16. The syringe carrier 16 is biased rearwardly by a compression coil spring 22 which contacts at its forward end a rear-facing shoulder 23 forming part of the central section 102. The syringe carrier receives a syringe 24 comprising a glass or other transparent capsule, with a needle 26 at its forward end and a slideable bung 28 for expelling the material in the syringe. The needle 26 is initially shrouded by a needle sheath 30 which is a push fit over the needle spigot 32.
A needle cap 34 comprises an outer collar 36 and a rearwardly extending cylindrical open-ended portion 38 which has at its rearward end an inwardly directed rib 40 which sits in the gap between the rear end of the needle sheath and the forward shoulder of the syringe 24. The rearward face of the rib 40 is bevelled such that, during assembly, can be pushed over the needle cap 30 to snap into the gap between the cap and the syringe shoulder.
At the rearward end of the injection device there is a provided a spring-loaded plunger 40 which has a forward end 44 dimensioned to fit within the syringe envelope contact the bung 28 and a forward flange 46 adapted in use to contact the rear end of the syringe 24 to limit the forward driving movement applied to the bung 28. A compression drive spring 48 acts between a rearward flange 50 of the plunger and an inner surface of the rear housing collar 104. The plunger has a split arrowhead 50 configuration of known form which releasably engages a retention surface 52 on the rear housing collar 104. A safety button 54 fits in a slot in the split arrowhead 50 to prevent inadvertent firing. Upon removal of the safety cap 54, a firing button 56 is exposed which, when depressed, squeezes the split arrowhead to release it from engagement.
The shutter element 12 is provided with two inwardly directed resilient struts 56 which project through respective slots 58 provided in the central portion 102 of the housing to limit longitudinal movement of the shutter element 12. The struts 56 engage the forward end of the compression spring 22 which also biases the syringe carrier 16 rearwardly. The struts 56 are made resilient by forming the collar 12 with two U-shaped cut-outs 57. The forward end of the central section 102 is chamfered as shown at 60 so that the shutter 12 may be assembled by sliding over the forward end of the housing so that the struts 56 are temporarily displaced outwards by the chamfer 60 then to drop into the forward end of the slots 58 to engage the spring 22.
In use, the needle cap 34 is removed by pulling it off forwardly and, as this is done, the rib 40 pulls the needle sheath 30 off the needle. The user then places the forward end of the housing against the intended injection site, removes the safety cap 54 and presses the firing button 56. This squeezes the arrowheads 50 together, thus releasing the plunger so that it is driven forwardly by the drive spring 48 initially to move the syringe forwardly due to the friction between the bung 28 and the syringe capsule and also to the generally incompressible nature of the fluid contents of the capsule. This forward movement continues until the rear end of the slot 18 contacts the inwardly directed pin 20 on the housing, whereafter the plunger drives bung 28 forwardly to expel the dose until the flange 46 engages the rear end of the syringe. The user then removes the injection device from the injection site, at which point it is in the state shown in Figure 6, with the needle projecting. The user then inverts the needle cap 34 so that the outer collar fits over and around the forward end of the housing 10 with the cylindrical portion 38 shielding the needle. This action may be a one way snap-fit.

Claims (5)

  1. CLAIMS1. An injection device comprising an elongate housing for receiving in use a syringe or cartridge, the housing having a forward end and a rearward end, and the syringe or cartridge having a needle which projects from the forward end of said housing at least on completion of the injection process, the needle being initially protected by a longitudinally removable sheath, said device further including a removable cap adapted to be fitted to the forward end of the housing in either of a pre-injection orientation and a post-injection orientation respectively, said cap having a rearwardly extending element adapted to engage at its rearward end behind a base of the removable sheath, when said cap is in its pre-injection orientation, whereby upon removal of said cap from the forward end of said housing, said sheath is removed from said needle, said cap being further adapted so that it may be re-fitted to the forward end of the housing in its post-injection orientation in which the rearwardly extending element of the cap extends forwardly of the housing to shroud said needle.
  2. 2. An injection device according to Claim 1, wherein said rearwardly extending element is of generally hollow cylindrical form with the rearward end thereof including an inwardly directed rib or tooth for engaging behind the base of said sheath.
  3. 3. An injection device according to Claim 1 or Claim 2, wherein the engagement between said rearwardly extended element and the base of said sheath is resilient whereby the rearward and of said rearward exterior element may move past said base during assembly
  4. 4. An injection device according to any of Claims 1 to 3, wherein said cap includes an outer collar that is adapted to be fitted over and around the forward end of the housing in the post-injection orientation.
  5. 5. An injection device according to any of Claims 1 to 4, wherein the cap is a one way snap-fit on the housing.
GB1004514A 2006-05-10 2006-05-10 Injection device with cap that can be re-fitted post injection Active GB2465919B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1004514A GB2465919B (en) 2006-05-10 2006-05-10 Injection device with cap that can be re-fitted post injection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0609229A GB2437922B (en) 2006-05-10 2006-05-10 Injection device comprising a window and a shutter element
GB1004514A GB2465919B (en) 2006-05-10 2006-05-10 Injection device with cap that can be re-fitted post injection

Publications (3)

Publication Number Publication Date
GB201004514D0 GB201004514D0 (en) 2010-05-05
GB2465919A true GB2465919A (en) 2010-06-09
GB2465919B GB2465919B (en) 2010-12-08

Family

ID=36637211

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1004514A Active GB2465919B (en) 2006-05-10 2006-05-10 Injection device with cap that can be re-fitted post injection
GB0609229A Active GB2437922B (en) 2006-05-10 2006-05-10 Injection device comprising a window and a shutter element

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB0609229A Active GB2437922B (en) 2006-05-10 2006-05-10 Injection device comprising a window and a shutter element

Country Status (7)

Country Link
US (2) US9174005B2 (en)
EP (2) EP2674182B1 (en)
JP (2) JP5180956B2 (en)
CN (2) CN102284106B (en)
CA (2) CA2651582C (en)
GB (2) GB2465919B (en)
WO (1) WO2007129106A2 (en)

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