WO2004108194A1 - Syringe firing mechanism - Google Patents

Syringe firing mechanism Download PDF

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Publication number
WO2004108194A1
WO2004108194A1 PCT/GB2004/002248 GB2004002248W WO2004108194A1 WO 2004108194 A1 WO2004108194 A1 WO 2004108194A1 GB 2004002248 W GB2004002248 W GB 2004002248W WO 2004108194 A1 WO2004108194 A1 WO 2004108194A1
Authority
WO
WIPO (PCT)
Prior art keywords
syringe
housing
cover
release
firing mechanism
Prior art date
Application number
PCT/GB2004/002248
Other languages
French (fr)
Inventor
Jeremy Marshall
Original Assignee
Owen Mumford Limited
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 Limited filed Critical Owen Mumford Limited
Priority to US10/559,179 priority Critical patent/US7465289B2/en
Priority to PL04734705T priority patent/PL1628694T3/en
Priority to JP2006508374A priority patent/JP4588019B2/en
Priority to DE602004007511T priority patent/DE602004007511T2/en
Priority to EP04734705A priority patent/EP1628694B1/en
Publication of WO2004108194A1 publication Critical patent/WO2004108194A1/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
    • 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
    • A61M5/32—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
    • A61M2005/2006—Having specific accessories
    • A61M2005/2013—Having specific accessories triggering of discharging means by contact of injector with patient body
    • 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
    • A61M2005/208—Release is possible only when device is pushed against the skin, e.g. using a trigger which is blocked or inactive when the device is not pushed against the skin
    • 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
    • A61M5/46—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 having means for controlling depth of 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
    • A61M5/50—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 having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile

Definitions

  • Safety syringe mechanisms are known wherein the syringe is initially held fully within a housing and, after injection, the syringe is again drawn back into the housing.
  • Such arrangements usually have a drive member which can be released and driven forward, firstly to cause the needle at least of the syringe to project from the housing, and then to cause a dose to be ejected from the syringe through the enclosed needle.
  • the syringe is caused to be withdrawn again into the housing by a return mechanism.
  • This invention aims to provide a syringe firing mechanism of this nature which is relatively simple in construction and which can readily be operated to perform the two stages of exposing the needle of the syringe and withdrawing the syringe into a housing after injection.
  • a syringe firing mechanism for a syringe held within a housing, the housing incorporating a drive spring acting on a drive member provided with a release trigger which, when released, enables the drive member to act on a plunger of the syringe under the bias of the drive spring, firstly to drive the body of the syringe forwardly to cause the needle portion of the syringe to move out of the housing and secondly to cause a dose to be ejected from the syringe, the housing also incorporating a return spring to provide a reverse bias on the syringe body to enable the needle portion of the syringe to be withdrawn into the housing after ejection of a dose, and a cover positioned over the rear of the housing and movable in a first direction towards the syringe to actuate the release trigger or to provide access for actuation of the release trigger, and movable subsequently in the reverse direction to actuate a release mechanism
  • the cover acts firstly to release the drive member and then to actuate a further release mechanism which causes the exposed needle to be withdrawn back into the housing.
  • the release mechanism comprises a projection inwardly from the region of the cover nearest to the syringe which will, when the cover is moved in the reverse direction, release a flap on the drive member to enable the head of the syringe plunger to enter a hollow interior of the drive member.
  • a third spring will be provided between the cover and the housing to cause the cover to move back to its start position, to actuate the release mechanism, when the operator's actuating pressure on the cover is released. This ensures that the operation of the release mechanism happens automatically once the operator releases the device.
  • the drive head will carry the release trigger which is normally located on a ledge of the housing until it is moved off the ledge, for release of the trigger to enable the drive member to move within the housing under the bias of the drive spring.
  • the structure is such that movement of the cover in the first direction pushes the trigger off the ledge.
  • the housing can have a flexible arm whose free end contacts the release trigger and also carries a projection which will be moved inwardly by movement of the cover in the first direction to any extent sufficient to actuate the release trigger.
  • the firing mechanism could be constructed such that there is a firing button, for actuating the release trigger, which projects through a side wall of the cover and is interlocked with the cover until the cover is moved in the first direction, whereupon the button can be pressed to actuate the release trigger.
  • the firing button can be carried at the end of a flexible arm forming part of the housing.
  • Figure 1 is a longitudinal cross-section through one example of a syringe firing mechanism of this invention
  • Figures 2A to 2D illustrate sequential stages of operation of the mechanism shown in Figure 1 ;
  • Figures 3A and 3B illustrate, in partial view and in a similar manner, two initial stages in the operation of an alternative form of firing mechanism.
  • Figure 1 shows a standard syringe 1 located within a housing 2.
  • a spring 3 biases a syringe carrier 4 associated with the syringe in a direction such as to hold the syringe 1 fully within the lower part of the housing 2A.
  • a plunger 5 projects from the syringe 1 into the upper part 2B of the housing.
  • At the top end of the housing section 2B there is a drive member 6 biased by a drive spring 7.
  • the drive member is held in place by a trigger 8 in the form of a flexible arm which rests on a ledge 9 in an opening in the side wall of the housing 2.
  • a cover 10 Surrounding the upper part of the housing 2B is a cover 10 which is biased outwardly by a spring 11. If the operator pushes the cover 10 towards the syringe 1, a flexible arm 12 of the housing 2 is forced inwardly by engagement of the inner side wall of the cover 10 with a projecting boss 13 on the arm 12 until the condition is reached as shown in Figure 2B.
  • the drive member 6 is now free to move within the housing portion 2B under the bias of the spring 7 and acts on the plunger 5 initially to cause the syringe 1 to move outwardly against the bias of the weaker spring 3 and then to cause the contents of the syringe to be ejected through the needle 14 as the plunger moves within the syringe 1.
  • the spring 11 acts to move the cover 10 outwardly.
  • a trigger member 15 acting on a flap 16 forming part of the drive member 6 (as shown in Figure 2C).
  • Further movement of the trigger member 15 to the position shown in Figure 2D causes the flap 16 to disengage from the side wall of the drive member 6.
  • the flap 16 can then fold inwardly about the hinge 17 into the interior of the hollow drive member 6. This removes any pressure from the plunger 5 and the spring 3 acts to withdraw the syringe 1 back into the housing 2.
  • the flexible arm 12 of the housing portion 2B extends outwardly at the free end to form a button 18.
  • this button cannot be moved inwardly because it rests against a portion 19 of the cover 10.
  • the button 18 is free to move inwardly, when pressed, to move the latch inwardly to free it from the ledge 9.
  • the drive member 6 can then be driven with forward by the spring 7 and the subsequent stages of operation are equivalent to those shown in Figures 2B to 2D.

Abstract

When a cover (10) of a syringe firing mechanism is pushed downwardly towards a housing (2) a flexible arm (12) is moved inwardly to release a trigger (8). This enables a drive member (6) to push down a plunger (5) of the syringe under the bias of a spring (7). When the injection is completed, release of the cover (10) causes the cover (10) to move back into contact with a corner of the drive member (6). A cam surface (15A) then pushes a flap (16) across, whilst bending a hinge (17), until the flap (16) enters the hollow interior of the drive member (6), thus enabling the syringe (1) to be withdrawn within the housing (2) under the bias of a spring (3).

Description

SYRINGE FIRING MECHANISM
Safety syringe mechanisms are known wherein the syringe is initially held fully within a housing and, after injection, the syringe is again drawn back into the housing. Such arrangements usually have a drive member which can be released and driven forward, firstly to cause the needle at least of the syringe to project from the housing, and then to cause a dose to be ejected from the syringe through the enclosed needle. At the end of the injection procedure, the syringe is caused to be withdrawn again into the housing by a return mechanism. This invention aims to provide a syringe firing mechanism of this nature which is relatively simple in construction and which can readily be operated to perform the two stages of exposing the needle of the syringe and withdrawing the syringe into a housing after injection.
According to the present invention there is provided a syringe firing mechanism for a syringe held within a housing, the housing incorporating a drive spring acting on a drive member provided with a release trigger which, when released, enables the drive member to act on a plunger of the syringe under the bias of the drive spring, firstly to drive the body of the syringe forwardly to cause the needle portion of the syringe to move out of the housing and secondly to cause a dose to be ejected from the syringe, the housing also incorporating a return spring to provide a reverse bias on the syringe body to enable the needle portion of the syringe to be withdrawn into the housing after ejection of a dose, and a cover positioned over the rear of the housing and movable in a first direction towards the syringe to actuate the release trigger or to provide access for actuation of the release trigger, and movable subsequently in the reverse direction to actuate a release mechanism which will free the plunger from the drive member to allow the syringe to be withdrawn into the housing under the bias of the return spring.
With this mechanism the cover acts firstly to release the drive member and then to actuate a further release mechanism which causes the exposed needle to be withdrawn back into the housing. In the preferred arrangement, the release mechanism comprises a projection inwardly from the region of the cover nearest to the syringe which will, when the cover is moved in the reverse direction, release a flap on the drive member to enable the head of the syringe plunger to enter a hollow interior of the drive member.
Ideally a third spring will be provided between the cover and the housing to cause the cover to move back to its start position, to actuate the release mechanism, when the operator's actuating pressure on the cover is released. This ensures that the operation of the release mechanism happens automatically once the operator releases the device.
In the preferred arrangement, the drive head will carry the release trigger which is normally located on a ledge of the housing until it is moved off the ledge, for release of the trigger to enable the drive member to move within the housing under the bias of the drive spring. In one arrangement, the structure is such that movement of the cover in the first direction pushes the trigger off the ledge. In this case, the housing can have a flexible arm whose free end contacts the release trigger and also carries a projection which will be moved inwardly by movement of the cover in the first direction to any extent sufficient to actuate the release trigger. As an alternative, the firing mechanism could be constructed such that there is a firing button, for actuating the release trigger, which projects through a side wall of the cover and is interlocked with the cover until the cover is moved in the first direction, whereupon the button can be pressed to actuate the release trigger. The firing button can be carried at the end of a flexible arm forming part of the housing.
The invention may be performed in various ways and two preferred embodiments thereof will now be described, with reference to the accompanying diagrammatic drawings, in which: Figure 1 is a longitudinal cross-section through one example of a syringe firing mechanism of this invention;
Figures 2A to 2D illustrate sequential stages of operation of the mechanism shown in Figure 1 ; and
Figures 3A and 3B illustrate, in partial view and in a similar manner, two initial stages in the operation of an alternative form of firing mechanism.
Figure 1 shows a standard syringe 1 located within a housing 2. A spring 3 biases a syringe carrier 4 associated with the syringe in a direction such as to hold the syringe 1 fully within the lower part of the housing 2A. A plunger 5 projects from the syringe 1 into the upper part 2B of the housing. At the top end of the housing section 2B there is a drive member 6 biased by a drive spring 7.
The drive member is held in place by a trigger 8 in the form of a flexible arm which rests on a ledge 9 in an opening in the side wall of the housing 2.
Surrounding the upper part of the housing 2B is a cover 10 which is biased outwardly by a spring 11. If the operator pushes the cover 10 towards the syringe 1, a flexible arm 12 of the housing 2 is forced inwardly by engagement of the inner side wall of the cover 10 with a projecting boss 13 on the arm 12 until the condition is reached as shown in Figure 2B. The drive member 6 is now free to move within the housing portion 2B under the bias of the spring 7 and acts on the plunger 5 initially to cause the syringe 1 to move outwardly against the bias of the weaker spring 3 and then to cause the contents of the syringe to be ejected through the needle 14 as the plunger moves within the syringe 1. When the cover 10 is subsequently released, the spring 11 acts to move the cover 10 outwardly. This results in a trigger member 15 acting on a flap 16 forming part of the drive member 6 (as shown in Figure 2C). Further movement of the trigger member 15 to the position shown in Figure 2D causes the flap 16 to disengage from the side wall of the drive member 6. This results from the fact that the cam surface 15A pushes the flap 16 across by flexing a hinge 17 until the flap enters the interior of the hollow drive member 6. The flap 16 can then fold inwardly about the hinge 17 into the interior of the hollow drive member 6. This removes any pressure from the plunger 5 and the spring 3 acts to withdraw the syringe 1 back into the housing 2.
In the alternative arrangement shown in Figures 3A and 3B, the closing inwardly of the trigger 8 of the drive member 6 is performed in a different manner. Otherwise, the operation of the device is identical to that shown in
Figures 1 and 2. In this instance, the flexible arm 12 of the housing portion 2B extends outwardly at the free end to form a button 18. In the condition shown in Figure 3A, this button cannot be moved inwardly because it rests against a portion 19 of the cover 10. However, when the cover 10 is moved inwardly to the condition shown in Figure 3B (corresponding essentially to that shown in Figure 2A), the button 18 is free to move inwardly, when pressed, to move the latch inwardly to free it from the ledge 9. Again, the drive member 6 can then be driven with forward by the spring 7 and the subsequent stages of operation are equivalent to those shown in Figures 2B to 2D.

Claims

CLAIMS 1. A syringe firing mechanism for a syringe held within a housing, the housing incorporating a drive spring acting on a drive member provided with a release trigger which, when released, enables the drive member to act on a plunger of the syringe under the bias of the drive spring, firstly to drive the body of the syringe forwardly to cause the needle portion of the syringe to move out of the housing and secondly to cause a dose to be ejected from the syringe, the housing also incorporating a return spring to provide a reverse bias on the syringe body to enable the needle portion of the syringe to be withdrawn into the housing after ejection of a dose, and a cover positioned over the rear of the housing and movable in a first direction towards the syringe to actuate the release trigger or to provide access for actuation of the release trigger, and movable subsequently in the reverse direction to actuate a release mechanism which will free the plunger from the drive member to allow the syringe to be withdrawn into the housing under the bias of the return spring.
2. A syringe firing mechanism according to claim 1, wherein said release mechanism comprises a projection inwardly from the region of the cover nearest to the syringe which will, when the cover is moved in the reverse direction, release a flap on the drive member to enable the head of the syringe plunger to enter a hollow interior of the drive member.
3. A syringe firing mechanism according to claim 1 or claim 2, wherein a third spring is provided between the cover and the housing to cause the cover to move back to its start position, to actuate the release mechanism, when the operator's actuating pressure on the cover is released.
4. A syringe firing mechanism according to any one of claims 1 to 3, wherein the drive head carries the release trigger which is normally located on a ledge of the housing until it is moved off the ledge, for release of the trigger to enable the drive member to move within the housing under the bias of the drive spring.
5. A syringe firing mechanism according to claim 4, wherein movement of the cover in the first direction pushes the trigger off the ledge.
6. A syringe firing mechanism according to claim 5, wherein the housing has a flexible arm whose free end contacts the release trigger and also carries a projection which will be moved inwardly by movement of the cover in the first direction to any extent sufficient to actuate the release trigger.
7. A syringe firing mechanism according to claim 4, wherein a firing button for actuating the release trigger projects through a side wall of the cover and is interlocked with the cover until the cover is moved in the first direction, whereupon the button can be pressed to actuate the release trigger.
8. A syringe firing mechanism according to claim 7, wherein the firing button is carried at the end of a flexible arm forming part of the housing.
9. Any novel combination of features of a syringe firing mechanism as described herein and/or as illustrated in the accompanying drawings.
10. A syringe firing mechanism substantially as herein described with reference to the accompanying drawings.
PCT/GB2004/002248 2003-06-05 2004-05-25 Syringe firing mechanism WO2004108194A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US10/559,179 US7465289B2 (en) 2003-06-05 2004-05-25 Syringe firing mechanism
PL04734705T PL1628694T3 (en) 2003-06-05 2004-05-25 Syringe firing mechanism
JP2006508374A JP4588019B2 (en) 2003-06-05 2004-05-25 Syringe firing mechanism
DE602004007511T DE602004007511T2 (en) 2003-06-05 2004-05-25 SYRINGE TRIGGER MECHANISM
EP04734705A EP1628694B1 (en) 2003-06-05 2004-05-25 Syringe firing mechanism

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0312852.7A GB0312852D0 (en) 2003-06-05 2003-06-05 Improvements relating to syringe firing mechanisms
GB0312852.7 2003-06-05

Publications (1)

Publication Number Publication Date
WO2004108194A1 true WO2004108194A1 (en) 2004-12-16

Family

ID=9959322

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/002248 WO2004108194A1 (en) 2003-06-05 2004-05-25 Syringe firing mechanism

Country Status (8)

Country Link
US (1) US7465289B2 (en)
EP (1) EP1628694B1 (en)
JP (1) JP4588019B2 (en)
AT (1) ATE366594T1 (en)
DE (1) DE602004007511T2 (en)
GB (1) GB0312852D0 (en)
PL (1) PL1628694T3 (en)
WO (1) WO2004108194A1 (en)

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FR2884721A1 (en) * 2005-04-20 2006-10-27 Becton Dickinson France Soc Pa Assistance device for device of injection of a product, comprises hollow body for receiving the product, hollow injection needle for penetrating into injection site, piston placed in the body, hollow sleeve with bearing surface
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WO2012084930A1 (en) * 2010-12-21 2012-06-28 Sanofi-Aventis Deutschland Gmbh Drug delivery device with housing comprising frangible zone
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US20060167412A1 (en) 2006-07-27
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US7465289B2 (en) 2008-12-16
EP1628694B1 (en) 2007-07-11

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