WO2005115511A1 - Injection device - Google Patents

Injection device Download PDF

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Publication number
WO2005115511A1
WO2005115511A1 PCT/GB2005/002128 GB2005002128W WO2005115511A1 WO 2005115511 A1 WO2005115511 A1 WO 2005115511A1 GB 2005002128 W GB2005002128 W GB 2005002128W WO 2005115511 A1 WO2005115511 A1 WO 2005115511A1
Authority
WO
WIPO (PCT)
Prior art keywords
syringe
drive
injection device
extended position
cross
Prior art date
Application number
PCT/GB2005/002128
Other languages
French (fr)
Inventor
Nigel Harrison
Original Assignee
Cilag Gmbh International
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=32671298&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2005115511(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to CA2568680A priority Critical patent/CA2568680C/en
Priority to US11/579,545 priority patent/US7785292B2/en
Priority to NZ552228A priority patent/NZ552228A/en
Priority to EP05746487.7A priority patent/EP1755707B2/en
Priority to DE602005020278T priority patent/DE602005020278D1/en
Priority to AU2005247151A priority patent/AU2005247151B2/en
Priority to AT05746487T priority patent/ATE462460T1/en
Priority to EA200602251A priority patent/EA010513B1/en
Priority to BRPI0510442A priority patent/BRPI0510442B8/en
Priority to JP2007514115A priority patent/JP5000489B2/en
Priority to ES05746487.7T priority patent/ES2343420T5/en
Priority to PL05746487T priority patent/PL1755707T5/en
Priority to MXPA06013900A priority patent/MXPA06013900A/en
Priority to DK05746487.7T priority patent/DK1755707T4/en
Application filed by Cilag Gmbh International filed Critical Cilag Gmbh International
Publication of WO2005115511A1 publication Critical patent/WO2005115511A1/en
Priority to IL179652A priority patent/IL179652A/en
Priority to NO20065976A priority patent/NO338762B1/en
Priority to KR1020067027415A priority patent/KR101175605B1/en

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
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • 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
    • 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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • 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
    • A61M2005/2006—Having specific accessories
    • 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
    • A61M5/31—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

Definitions

  • the present invention relates to an injection device of the type that receives a syringe, extends it and discharges its contents.
  • Devices of this general description are shown in WO 95/35126 and EP-A-0 516 473 and generally comprise a syringe in a housing with a drive spring that can be released by actuation of a trigger. Depression of the trigger causes the drive spring to become operative.
  • the first automatic action of current injection devices is to drive a syringe forward and push a needle of the syringe into the patient. This is achieved by applying a force to either the syringe body ("direct drive”) or the syringe piston (“piston drive”). Piston drive is a simpler approach to engineer as one mechanism can be used to drive the needle out and then expel the contents of the syringe. However, this approach does carry a risk that a small quantity of the fluid may be expelled before the needle has reached a required depth in a patient's skin. The system relies on the needle reaching foil depth before a significant quantity of fluid can be expelled. The rate of fluid delivery is limited by the force available, the viscosity of the fluid and the restriction of the needle. This property has sometimes been described as hydraulic lock.
  • an injection device comprising: a housing adapted to receive a syringe having a discharge nozzle; and a drive arranged on actuation to advance the syringe from a retracted position to an extended position through an opening in the housing and discharge the contents of the syringe, characterised by a locking mechanism which engages the drive with the syringe when the syringe is not in its extended position and which is disengaged from the drive and engages the syringe with the housing when the syringe is in its extended position such that movement of the drive relative to the syringe is prevented when the syringe is advanced from its retracted position to its extended position and movement of the housing relative to the syringe is prevented when the syringe is in its extended position and its contents are being discharged.
  • the syringe when the drive is locked to the syringe, the contents of the syringe are not ejected through the discharge nozzle as the syringe is moved from its retracted to its extended position. Furthermore, when the syringe is in its extended position and its contents are being discharged, the syringe is locked to the housing so that it cannot be forced back into the housing by an external force as its contents are being discharged, for example by the contact force between a patient and their skin.
  • an injection device in one embodiment, wherein an inner surface of the housing defines at least a first cross-section and a second cross-section of the housing with a first internal diameter and a second internal diameter respectively, the first diameter being less than the second diameter and the second cross- section located adjacent the opening; wherein the drive comprises a first detent; and wherein the locking mechanism comprises at least one movable locking member positioned between the inner surface and the drive, such that the locking member is engaged in the first detent when positioned between the inner surface and drive in the first cross-section and is disengaged from the first detent when positioned in the second cross- section.
  • This arrangement provides a simple locking mechanism which is simple to manufacture.
  • the first detent is a channel in an outer surface of the drive. If the drive is cylindrical, the channel may extend around the circumference of the drive.
  • the locking member when located in the first cross-section, acts on a flange of the syringe located at an end of the syringe opposite the discharge nozzle.
  • a conventional syringe can be utilised in the injection device.
  • the injection device comprises a support member arranged to constrain the locking member against the flange of the syringe.
  • the locking mechanism acts on the support member which then acts on the syringe.
  • the support member is a sleeve surrounding the drive.
  • the sleeve comprises an outer surface and an inner surface and an opening between its inner surface and its outer surface dimensioned to support the locking member. The sleeve can easily be positioned around the drive during manufacture.
  • the first cross-section and second cross-section are preferably separated by a step in the inner surface, such that the location of the step in the inner surface defines the location at which the locking mechanism is disengaged from the plunger as the drive advances the syringe from the retracted position to the extended position.
  • the step may be ramped between the first cross-section and the second cross-section.
  • each locking member is a ball which allows the locking member to freely rotate as the plunger moves relative to the housing and syringe.
  • edges of the first detent are bevelled to allow the balls to move in and out of the channel easily.
  • the locking mechanism is arranged in communication with the drive such that it becomes disengaged from the housing when the syringe is in its extended position when the contents of the syringe have been discharged, thereby permitting the syringe to be moved from its extended position to its retracted position.
  • the syringe does not remain locked in its extended position and can be safely retracted into the housing of the syringe.
  • the drive may comprise a second detent at the end of the drive furthest from the opening such that when the second detent is positioned adjacent the locking member when the contents of the syringe have been discharged, the locking member becomes positioned in the first cross-section, thereby disengaging the locking mechanism from the housing and permitting the syringe to be moved from its extended position to its retracted position.
  • the injection device may comprise a return drive arranged to act upon the syringe after the contents of the syringe have been discharged to withdraw the syringe from the extended position to the retracted position. This way, the syringe can be automatically retracted into the housing after discharge of its contents.
  • the locking mechanism ensures that retraction does not occur until the drive has reached a certain pre-defined position relative to the syringe.
  • the drive may be a plunger of the syringe.
  • Fig. la shows in section an injection device of the type to which the present invention is applicable with a syringe retracted before discharge of its contents;
  • Fig. lb shows in section the injection device of Fig. la with the syringe folly extended before discharge of its contents
  • Fig. lc shows in section the injection device of Fig. la with the syringe folly extended after discharge of its contents.
  • Fig. la shows an injection device 110 according to the present invention.
  • the injection device 110 has a housing 112 which has a first internal cross-section 113a and a second internal cross-section 113b.
  • the injection device 110 has a proximal end 101 and a distal end 102.
  • the first cross-section 113a has a diameter which is less than the diameter of the second cross-section 113b.
  • the change in diameter between the first cross-section 113a and the second cross-section 113b is defined by a step 115 which is a continuous slope line (i.e. a ramp) between the inner surfaces of the first and second cross-sections 113a, 113b.
  • a syringe 114 of conventional hypodermic type is slidably mounted inside the housing 112.
  • the housing 112 has a proximal end 101 and a distal end 102. At the proximal end 101 of the housing 112 is an opening 150 through which the syringe 114 is moved from a retracted position inside the housing 112 into an extended position outside the housing 112.
  • the second cross-section 113b is located nearer to the proximal end 101 than the distal end 102 of the housing 112.
  • the syringe 114 includes a discharge nozzle which is shown terminating at one end in a hypodermic needle 118 and at the other in a flange 120.
  • the drive also comprises resilient biasing means connected at one end to the distal end 102 of the housing and at its other end to the end of the plunger which is not inserted into the syringe 112.
  • the resilient biasing means here takes the form of a compression drive spring 130.
  • This drive element 134 constrains a drug 124 to be administered within the syringe body 116. Whilst the syringe 114 illustrated is of hypodermic type, this need not necessarily be so. Transcutaneous or ballistic dermal and subcutaneous syringes may also be used with the injection device of the present invention.
  • Drive from the drive spring 130 is transmitted via the drive element 134 to the syringe 114 to advance it from its retracted position (as shown in Fig. la) to its extended position (as shown in Fig lb) and discharge its contents through the needle 118.
  • the drive element 134 accomplishes this task by acting directly on the drug 124 and the syringe 114.
  • a channel 155 is located about the circumference of the drive element 134 in the end of the drive element 134 nearest the proximal end 101 of the housing 112.
  • Locking members are provided in the housing 112 which, in Figs, la to lc, are balls 160 located between the drive element 134 and the inner surfaces of the housing 112.
  • the housing 112, balls 160, drive element 134 and channel 155 are all dimensioned such that when the balls 160 and drive element 134 are located in the first cross-section 113a, the balls 160 must sit in the channel 155. Here, the balls 160 are free to rotate, but remain fixed relative to the drive element 134. When the balls 160 and drive element 134 are located in the second cross- section 113b, the balls 160 need not be located in the channel 160 and are free to move out of the channel 155 in a perpendicular direction to a longitudinal axis 175 of the housing 112.
  • the channel 155 is bevelled such that the force applied to the drive 134 by the spring 130 forces the balls 160 out of the channel 155 into the gap created between the balls and the inner surface of the housing 112 from the increase in cross-sectional area between the first cross-section 113a and the second cross section 113b.
  • the balls 160 and drive element 134 can move relative to each other since the balls 160 are no longer held in the channel 155.
  • the drive spring 130 is able to act on the drive 134 and force it through the syringe 114 discharging its contents.
  • a support member 170 is located around the balls 160.
  • the support member 170 takes the form of a ring which has is positioned over the drive element 134.
  • the ring is free to slide over the drive element 134.
  • the ring has an inner surface and an outer surface and, for each ball, there is an opening in the form of a hole between the outer and inner surfaces in which the ball is positioned.
  • the step 115 is located such that the syringe 114 will be in its extended position when the balls 160 reach the step 115.
  • the drive element 134 has a detent 156 at its end which is not inserted into the syringe 112 which is of narrower cross-section than its main body.
  • the detent 156 reaches the second cross section 113b, the balls 160 are no longer forced against the inner surface of the housing 112 (as shown in Fig. lc).
  • Force along the syringe 112 from the proximal end 101 in the direction of the distal end 102 causes the syringe 112 to move from an extended position to a retracted position. This force is applied by a return drive spring (not shown).

Abstract

The invention concerns an injection device (110) with a housing (112) adapted to receive a syringe (114) having a discharge nozzle (118) and a plunger (130). There is a trigger and a drive (134) arranged to act upon the plunger on actuation of the trigger to advance the syringe from a retracted position to an extended position through an opening (150) in the housing. A locking mechanism (160, 170) is arranged in and moveable relative to the housing. The locking mechanism is engaged with the plunger when the syringe is not in its extended position and disengaged from the plunger when the syringe is in its extended position. This means that movement of the plunger relative to the syringe is prevented when, in use, the syringe is advanced from a retracted position to an extended position. Hence the contents of the syringe are not expelled from the syringe during advancement form the retracted position to the extended position. Hence the contents of the syringe are not expelled from the syringe during advancement form the retracted position to the extended position. The contents are only expelled when the syringe reaches the extended position.

Description

INJECTION DEVICE
FIELD OF INVENTION
The present invention relates to an injection device of the type that receives a syringe, extends it and discharges its contents. Devices of this general description are shown in WO 95/35126 and EP-A-0 516 473 and generally comprise a syringe in a housing with a drive spring that can be released by actuation of a trigger. Depression of the trigger causes the drive spring to become operative.
BACKGROUND OF INVENTION
The first automatic action of current injection devices is to drive a syringe forward and push a needle of the syringe into the patient. This is achieved by applying a force to either the syringe body ("direct drive") or the syringe piston ("piston drive"). Piston drive is a simpler approach to engineer as one mechanism can be used to drive the needle out and then expel the contents of the syringe. However, this approach does carry a risk that a small quantity of the fluid may be expelled before the needle has reached a required depth in a patient's skin. The system relies on the needle reaching foil depth before a significant quantity of fluid can be expelled. The rate of fluid delivery is limited by the force available, the viscosity of the fluid and the restriction of the needle. This property has sometimes been described as hydraulic lock.
It is therefore an aim of the present invention to provide an injection device utilising a piston drive approach which does not expel any fluid before a needle has reached a required depth in a patient's skin. As ever, the simplest and cheapest way of achieving this is sought. SUMMARY OF THE INVENTION
In view of the foregoing, according to the present invention, there is provided an injection device, comprising: a housing adapted to receive a syringe having a discharge nozzle; and a drive arranged on actuation to advance the syringe from a retracted position to an extended position through an opening in the housing and discharge the contents of the syringe, characterised by a locking mechanism which engages the drive with the syringe when the syringe is not in its extended position and which is disengaged from the drive and engages the syringe with the housing when the syringe is in its extended position such that movement of the drive relative to the syringe is prevented when the syringe is advanced from its retracted position to its extended position and movement of the housing relative to the syringe is prevented when the syringe is in its extended position and its contents are being discharged. Hence, when the drive is locked to the syringe, the contents of the syringe are not ejected through the discharge nozzle as the syringe is moved from its retracted to its extended position. Furthermore, when the syringe is in its extended position and its contents are being discharged, the syringe is locked to the housing so that it cannot be forced back into the housing by an external force as its contents are being discharged, for example by the contact force between a patient and their skin.
In one embodiment of the present invention, an injection device according to claim 1, wherein an inner surface of the housing defines at least a first cross-section and a second cross-section of the housing with a first internal diameter and a second internal diameter respectively, the first diameter being less than the second diameter and the second cross- section located adjacent the opening; wherein the drive comprises a first detent; and wherein the locking mechanism comprises at least one movable locking member positioned between the inner surface and the drive, such that the locking member is engaged in the first detent when positioned between the inner surface and drive in the first cross-section and is disengaged from the first detent when positioned in the second cross- section. This arrangement provides a simple locking mechanism which is simple to manufacture.
Preferably, the first detent is a channel in an outer surface of the drive. If the drive is cylindrical, the channel may extend around the circumference of the drive. Preferably, when located in the first cross-section, the locking member acts on a flange of the syringe located at an end of the syringe opposite the discharge nozzle. Thus, a conventional syringe can be utilised in the injection device.
Advantageously, the injection device comprises a support member arranged to constrain the locking member against the flange of the syringe. The locking mechanism acts on the support member which then acts on the syringe.
In one embodiment of the present invention, the support member is a sleeve surrounding the drive. Preferably, the sleeve comprises an outer surface and an inner surface and an opening between its inner surface and its outer surface dimensioned to support the locking member. The sleeve can easily be positioned around the drive during manufacture.
The first cross-section and second cross-section are preferably separated by a step in the inner surface, such that the location of the step in the inner surface defines the location at which the locking mechanism is disengaged from the plunger as the drive advances the syringe from the retracted position to the extended position. The step may be ramped between the first cross-section and the second cross-section.
Preferably, each locking member is a ball which allows the locking member to freely rotate as the plunger moves relative to the housing and syringe.
Advantageously, the edges of the first detent are bevelled to allow the balls to move in and out of the channel easily.
In one embodiment of the present invention, the locking mechanism is arranged in communication with the drive such that it becomes disengaged from the housing when the syringe is in its extended position when the contents of the syringe have been discharged, thereby permitting the syringe to be moved from its extended position to its retracted position. Thus, the syringe does not remain locked in its extended position and can be safely retracted into the housing of the syringe. Preferably, the drive may comprise a second detent at the end of the drive furthest from the opening such that when the second detent is positioned adjacent the locking member when the contents of the syringe have been discharged, the locking member becomes positioned in the first cross-section, thereby disengaging the locking mechanism from the housing and permitting the syringe to be moved from its extended position to its retracted position.
The injection device may comprise a return drive arranged to act upon the syringe after the contents of the syringe have been discharged to withdraw the syringe from the extended position to the retracted position. This way, the syringe can be automatically retracted into the housing after discharge of its contents. The locking mechanism ensures that retraction does not occur until the drive has reached a certain pre-defined position relative to the syringe.
Advantageously, the drive may be a plunger of the syringe.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described by way of example with reference to the accompanying drawings, in which:
Fig. la shows in section an injection device of the type to which the present invention is applicable with a syringe retracted before discharge of its contents;
Fig. lb shows in section the injection device of Fig. la with the syringe folly extended before discharge of its contents; and
Fig. lc shows in section the injection device of Fig. la with the syringe folly extended after discharge of its contents. DETAILED DESCRIPTION OF THE DRAWINGS
Fig. la shows an injection device 110 according to the present invention. The injection device 110 has a housing 112 which has a first internal cross-section 113a and a second internal cross-section 113b. The injection device 110 has a proximal end 101 and a distal end 102. The first cross-section 113a has a diameter which is less than the diameter of the second cross-section 113b. The change in diameter between the first cross-section 113a and the second cross-section 113b is defined by a step 115 which is a continuous slope line (i.e. a ramp) between the inner surfaces of the first and second cross-sections 113a, 113b. A syringe 114 of conventional hypodermic type is slidably mounted inside the housing 112. The housing 112 has a proximal end 101 and a distal end 102. At the proximal end 101 of the housing 112 is an opening 150 through which the syringe 114 is moved from a retracted position inside the housing 112 into an extended position outside the housing 112. The second cross-section 113b is located nearer to the proximal end 101 than the distal end 102 of the housing 112.
The syringe 114 includes a discharge nozzle which is shown terminating at one end in a hypodermic needle 118 and at the other in a flange 120. The conventional plunger and bung that would normally be used to discharge the contents of the syringe 114 manually have been removed and replaced with a drive 134 which is essentially of the form of a plunger and has a bung on its end which is inserted into the syringe 114. The drive also comprises resilient biasing means connected at one end to the distal end 102 of the housing and at its other end to the end of the plunger which is not inserted into the syringe 112. The resilient biasing means here takes the form of a compression drive spring 130. This drive element 134 constrains a drug 124 to be administered within the syringe body 116. Whilst the syringe 114 illustrated is of hypodermic type, this need not necessarily be so. Transcutaneous or ballistic dermal and subcutaneous syringes may also be used with the injection device of the present invention.
Drive from the drive spring 130 is transmitted via the drive element 134 to the syringe 114 to advance it from its retracted position (as shown in Fig. la) to its extended position (as shown in Fig lb) and discharge its contents through the needle 118. The drive element 134 accomplishes this task by acting directly on the drug 124 and the syringe 114. A channel 155 is located about the circumference of the drive element 134 in the end of the drive element 134 nearest the proximal end 101 of the housing 112. Locking members are provided in the housing 112 which, in Figs, la to lc, are balls 160 located between the drive element 134 and the inner surfaces of the housing 112. The housing 112, balls 160, drive element 134 and channel 155 are all dimensioned such that when the balls 160 and drive element 134 are located in the first cross-section 113a, the balls 160 must sit in the channel 155. Here, the balls 160 are free to rotate, but remain fixed relative to the drive element 134. When the balls 160 and drive element 134 are located in the second cross- section 113b, the balls 160 need not be located in the channel 160 and are free to move out of the channel 155 in a perpendicular direction to a longitudinal axis 175 of the housing 112. Indeed, the channel 155 is bevelled such that the force applied to the drive 134 by the spring 130 forces the balls 160 out of the channel 155 into the gap created between the balls and the inner surface of the housing 112 from the increase in cross-sectional area between the first cross-section 113a and the second cross section 113b. Here, the balls 160 and drive element 134 can move relative to each other since the balls 160 are no longer held in the channel 155. Hence, the drive spring 130 is able to act on the drive 134 and force it through the syringe 114 discharging its contents. At the same time, since the balls 160 have been forced outwards by the drive 134 into the second cross-section 113b, they are unable to move back into the first cross-section 113a and therefore act to lock the syringe in its extended position (see Fig. lb).
A support member 170 is located around the balls 160. The support member 170 takes the form of a ring which has is positioned over the drive element 134. The ring is free to slide over the drive element 134. The ring has an inner surface and an outer surface and, for each ball, there is an opening in the form of a hole between the outer and inner surfaces in which the ball is positioned.
As mentioned above, when the balls 160 are located in the first cross-section 113a, they are locked into the channel 155. Hence, as shown in Fig. la, when the drive spring is released by a trigger (not shown) force from the drive spring 130 against the drive element 134 is transmitted via the channel 155, through the balls 160 and support member 170 into the flange 120 of the syringe 114 to cause the syringe 114 to slide from its retracted position out of the opening 150 towards its extended position without the drive element 134 and syringe 114 moving relative to each other. Therefore, drug 124 is not expelled from the syringe 114 during advancement of the syringe 114 from its retracted position to its extended position.
When the balls 160 reach the second cross-section 113b (i.e. when the syringe 114 is in its extended position), they are free to move out of the channel 155 in a perpendicular direction to the longitudinal axis 175 of the housing 112, thus becoming disengaged from the channel 155. This is shown in Fig. lb.
The step 115 is located such that the syringe 114 will be in its extended position when the balls 160 reach the step 115.
Now the force from the drive spring 130 in a direction parallel to the longitudinal axis 175 is applied mainly to the drive element 134 and not to the flange 120. Hence, the drive element 134 will slide in the syringe 114 and expel the drug 124 through the needle 118.
When the syringe 112 is in its extended position (as shown in Fig. lb), the balls are forced against the inner surface of the second cross-section 112. Any force along the syringe 112 from the proximal end 101 in the direction of the distal end 102 is transmitted through the flange 120 to the balls 160 which are locked out against the step 115. In this way, the syringe 112 is prevented from moving from its extended position to its retracted position whilst its contents are being discharged.
The drive element 134 has a detent 156 at its end which is not inserted into the syringe 112 which is of narrower cross-section than its main body. When the detent 156 reaches the second cross section 113b, the balls 160 are no longer forced against the inner surface of the housing 112 (as shown in Fig. lc). Force along the syringe 112 from the proximal end 101 in the direction of the distal end 102 causes the syringe 112 to move from an extended position to a retracted position. This force is applied by a return drive spring (not shown). It will of course be understood that the present invention has been described above purely by way of example and modifications of detail can be made within the scope of the invention.

Claims

1. An injection device, comprising: a housing adapted to receive a syringe having a discharge nozzle; and a drive arranged on actuation to advance the syringe from a retracted position to an extended position through an opening in the housing and discharge the contents of the syringe, characterised by a locking mechanism which engages the drive with the syringe when the syringe is not in its extended position and which is disengaged from the drive and engages the syringe with the housing when the syringe is in its extended position such that movement of the drive relative to the syringe is prevented when the syringe is advanced from its retracted position to its extended position and movement of the housing relative to the syringe is prevented when the syringe is in its extended position and its contents are being discharged.
2. An injection device according to claim 1, wherein an inner surface of the housing defines at least a first cross-section and a second cross-section of the housing with a first internal diameter and a second internal diameter respectively, the first diameter being less than the second diameter and the second cross-section located adjacent the opening; wherein the drive comprises a first detent; and wherein the locking mechanism comprises at least one movable locking member positioned between the inner surface and the drive, such that the locking member is engaged in the first detent when positioned between the inner surface and drive in the first cross-section and is disengaged from the first detent when positioned in the second cross-section.
3. An injection device according to claim 2, wherein the first detent is a channel in an outer surface of the drive.
4. An injection device according to claim 2 or claim 3, wherein, when located in the first cross-section, the locking mechanism acts on a flange of the syringe located at an end of the syringe opposite the discharge nozzle.
5. An injection device according to claim 4, further comprising a support member arranged to constrain the locking member against the flange of the syringe.
6. An injection device according to claim 5, wherein the support member is a sleeve surrounding the drive.
7. An injection device according to claim 6, wherein the sleeve comprises an outer surface and an inner surface and an opening between its inner surface and its outer surface dimensioned to support the locking member.
8. An injection device according to any one of claims 2 to 7, wherein the first cross- section and second cross-section are separated by a step in the inner surface, such that the location of the step in the inner surface defines the location at which the locking mechanism is disengaged from the drive as the syringe is advanced from its retracted position to its extended position.
9. An injection device according to claim 8, wherein the step is ramped between the first cross-section and the second cross-section.
10. An injection device according to any one of claims 2 to 9, wherein the edges of the first detent are bevelled.
11. An injection device according to any one of claims 2 to 10, wherein each locking member is a ball.
12. An injection device according to any one of the preceding claims, wherein the locking mechanism is arranged in communication with the drive such that it becomes disengaged from the housing when the syringe is in its extended position when the contents of the syringe have been discharged, thereby permitting the syringe to be moved from its extended position to its retracted position.
13. An injection device according to claim 12 when dependent on claim 2, wherein the drive comprises a second detent at the end of the drive furthest from the opening such that when the second detent is positioned adjacent the locking member when the contents of the syringe have been discharged, the locking member becomes positioned in the first cross- section, thereby disengaging the locking mechanism from the housing and permitting the syringe to be moved from its extended position to its retracted position
14. An injection device according to claim 12 or claim 13, further comprising a return drive arranged to act upon the syringe after the contents of the syringe have been discharged to withdraw the syringe from the extended position to the retracted position.
15. An injection device according to any one of the preceding claims, wherein the drive is a plunger of the syringe.
16. An injection device according to any one of claims 2 to 16 comprising a plurality of locking members.
16. An injection device, substantially as hereinbefore described with reference to the accompanying drawings.
PCT/GB2005/002128 2004-05-28 2005-05-27 Injection device WO2005115511A1 (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
US11/579,545 US7785292B2 (en) 2004-05-28 2005-05-27 Injection device
JP2007514115A JP5000489B2 (en) 2004-05-28 2005-05-27 Injection device
BRPI0510442A BRPI0510442B8 (en) 2004-05-28 2005-05-27 injection device
EP05746487.7A EP1755707B2 (en) 2004-05-28 2005-05-27 Injection device
DE602005020278T DE602005020278D1 (en) 2004-05-28 2005-05-27 INJECTION DEVICE
AU2005247151A AU2005247151B2 (en) 2004-05-28 2005-05-27 Injection device
AT05746487T ATE462460T1 (en) 2004-05-28 2005-05-27 INJECTION DEVICE
EA200602251A EA010513B1 (en) 2004-05-28 2005-05-27 Injection device
NZ552228A NZ552228A (en) 2004-05-28 2005-05-27 Retractable syringe with prevention of discharge until syringe is in extended position
CA2568680A CA2568680C (en) 2004-05-28 2005-05-27 Injection device
PL05746487T PL1755707T5 (en) 2004-05-28 2005-05-27 Injection device
ES05746487.7T ES2343420T5 (en) 2004-05-28 2005-05-27 Injection device
MXPA06013900A MXPA06013900A (en) 2004-05-28 2005-05-27 Injection device.
DK05746487.7T DK1755707T4 (en) 2004-05-28 2005-05-27 An injection device
IL179652A IL179652A (en) 2004-05-28 2006-11-28 Injection device
NO20065976A NO338762B1 (en) 2004-05-28 2006-12-22 injection device
KR1020067027415A KR101175605B1 (en) 2004-05-28 2006-12-27 Injection device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0412057A GB2414405B (en) 2004-05-28 2004-05-28 Injection device
GB0412057.2 2004-05-28

Publications (1)

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WO2005115511A1 true WO2005115511A1 (en) 2005-12-08

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US (1) US7785292B2 (en)
EP (1) EP1755707B2 (en)
JP (1) JP5000489B2 (en)
KR (1) KR101175605B1 (en)
CN (1) CN100563737C (en)
AT (1) ATE462460T1 (en)
AU (1) AU2005247151B2 (en)
BR (1) BRPI0510442B8 (en)
CA (1) CA2568680C (en)
DE (1) DE602005020278D1 (en)
DK (1) DK1755707T4 (en)
EA (1) EA010513B1 (en)
ES (1) ES2343420T5 (en)
GB (1) GB2414405B (en)
IL (1) IL179652A (en)
MX (1) MXPA06013900A (en)
NO (2) NO338662B1 (en)
NZ (1) NZ552228A (en)
PL (1) PL1755707T5 (en)
PT (1) PT1755707E (en)
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US10022503B2 (en) 2011-01-24 2018-07-17 Abbvie Biotechnology Ltd Removal of needle shield from syringes and automatic injection devices
US10806867B2 (en) 2011-01-24 2020-10-20 E3D Agricultural Cooperative Association Ltd. Injector
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