CA2590281A1 - Coupling for an auto-injection device - Google Patents
Coupling for an auto-injection device Download PDFInfo
- Publication number
- CA2590281A1 CA2590281A1 CA002590281A CA2590281A CA2590281A1 CA 2590281 A1 CA2590281 A1 CA 2590281A1 CA 002590281 A CA002590281 A CA 002590281A CA 2590281 A CA2590281 A CA 2590281A CA 2590281 A1 CA2590281 A1 CA 2590281A1
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- CA
- Canada
- Prior art keywords
- spring
- coupling
- shoulder
- injection
- plunger
- 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.)
- Abandoned
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 61
- 238000010168 coupling process Methods 0.000 title claims abstract description 61
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 61
- 238000002347 injection Methods 0.000 title claims description 90
- 239000007924 injection Substances 0.000 title claims description 90
- 230000004913 activation Effects 0.000 claims description 13
- 229910000639 Spring steel Inorganic materials 0.000 claims description 3
- 239000003814 drug Substances 0.000 description 8
- 230000000712 assembly Effects 0.000 description 6
- 238000000429 assembly Methods 0.000 description 6
- 230000004323 axial length Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 208000012266 Needlestick injury Diseases 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 208000030507 AIDS Diseases 0.000 description 1
- 206010002199 Anaphylactic shock Diseases 0.000 description 1
- 206010020751 Hypersensitivity Diseases 0.000 description 1
- 241000371980 Influenza B virus (B/Shanghai/361/2002) Species 0.000 description 1
- 208000026935 allergic disease Diseases 0.000 description 1
- 230000007815 allergy Effects 0.000 description 1
- 208000003455 anaphylaxis Diseases 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 208000006454 hepatitis Diseases 0.000 description 1
- 231100000283 hepatitis Toxicity 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- A61M5/1782—Devices aiding filling of syringes in situ
-
- 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
- A61M5/001—Apparatus specially adapted for cleaning or sterilising syringes or needles
-
- 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
- A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
- A61M5/2455—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic with sealing means to be broken or opened
- A61M5/2459—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic with sealing means to be broken or opened upon internal pressure increase, e.g. pierced or burst
-
- 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
- A61M5/28—Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle
- A61M5/285—Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle with sealing means to be broken or opened
- A61M5/286—Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle with sealing means to be broken or opened upon internal pressure increase, e.g. pierced or burst
-
- 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
- A61M5/31596—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms comprising means for injection of two or more media, e.g. by mixing
-
- 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
- A61M5/31—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
- A61M2005/206—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
- A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
- A61M2005/2403—Ampoule inserted into the ampoule holder
-
- 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
- A61M2005/3107—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle for needles
-
- 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
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
- A61M2005/31516—Piston or piston-rod constructions, e.g. connection of piston with piston-rod reducing dead-space in the syringe barrel after delivery
-
- 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
Abstract
A coupling for selectively securing a spring to a plunger is provided. The coupling has a first end defining a spring rest for receiving the spring and a second end defining a shoulder. The shoulder is moveable to a first position into contact with the plunger and to a second position out of contact with the plunger. The shoulder is normally in the second position and is resiliently moveable to the first position.
Description
COUPLING FOR AN AUTO-INJECTION DEVICE
CROSS REFERENCE TO RELATED APPLICATIONS
[0001]This application claims priority of U.S. Provisional Application Serial No.
60/634,486 filed on December 9, 2004 and is related to commonly owned and assigned U.S. Application Serial No. 10/601,212, filed June 20, 2003, the contents of both of which are incorporated by reference herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention [0002]The present disclosure is related to auto-injection devices. More particularly, the present disclosure is related to a coupling for auto-injection devices for releasably securing an injection spring to a plunger rod.
2. Description of Related Art [0003] Diseases such as AIDS, Hepatitis, and others, are increasing within the general population. The onset of these diseases has increased the desire to prevent inadvertent needle sticks during the use of syringe assemblies. Many prior art devices include self-retracting needles to mitigate inadvertent needle sticks.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001]This application claims priority of U.S. Provisional Application Serial No.
60/634,486 filed on December 9, 2004 and is related to commonly owned and assigned U.S. Application Serial No. 10/601,212, filed June 20, 2003, the contents of both of which are incorporated by reference herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention [0002]The present disclosure is related to auto-injection devices. More particularly, the present disclosure is related to a coupling for auto-injection devices for releasably securing an injection spring to a plunger rod.
2. Description of Related Art [0003] Diseases such as AIDS, Hepatitis, and others, are increasing within the general population. The onset of these diseases has increased the desire to prevent inadvertent needle sticks during the use of syringe assemblies. Many prior art devices include self-retracting needles to mitigate inadvertent needle sticks.
[0004] Many life-threatening situations such as allergy induced anaphylactic shock, and exposure to chemical, radiological, and biological weapons can require the use of automatic injection devices. Also, many non-threatening conditions can be candidates for use of such automatic injection devices.
However, the cost of the prior art automatic injection device can make such use by consumers cost prohibitive.
However, the cost of the prior art automatic injection device can make such use by consumers cost prohibitive.
[0005]Typical automatic injection devices are syringe assemblies that allow the medically untrained user to automatically inject a medicine by manually trigging the automatic injection. Some prior automatic injection devices also incorporate self-retracting needles. Such automatic injection and retraction assemblies included a coupling that releasably couples an injection spring to a syringe plunger. Unfortunately, many prior couplings require tight manufacturing tolerances, which can increase the overall cost of the device.
[0006]Accordingly, there is a continuing need for auto-injection devices and couplings for such devices that overcome and/or mitigate one or more of the aforementioned and other deficiencies and deleterious effects of prior automatic injection devices.
BRIEF SUMMARY OF THE INVENTION
BRIEF SUMMARY OF THE INVENTION
[0007] It is an object of the present disclosure to provide a coupling for selectively securing a spring to a plunger. The coupling has a first end defining a spring rest for receiving the spring and a second end defining a shoulder. The shoulder is moveable to a first position into contact with the plunger and to a second position out of contact with the plunger. The shoulder is normally in the second position and is resiliently moveable to the first position.
[0008] In some embodiments, the coupling includes a first end defining a spring rest for receiving the spring and a second end defining a shoulder. The spring rest and the shoulder are radially offset from one another by a predetermined angle.
[0009] In other embodiments, the coupling includes a first end defining a pair of spring rests for receiving the spring and a second end defining a pair of shoulders. The pair of shoulders are moveable to a first position into contact with the plunger and a second position out of contact with the plunger.
[0010]A power injection assembly is also provided. The assembly includes a plunger rod, an injection spring, an inner housing, and a coupling. The plunger rod has a rib. The inner housing has a first opening and an inner diameter.
The injection spring is about the inner housing and the plunger rod is in the inner diameter. The coupling has a spring rest and a shoulder. The coupling is in the inner diameter such that the spring rest extends through the first opening and receives the injection spring and such that the shoulder is compressed to a first position by the inner diameter. The shoulder is engaged with the rib in the first position.
The injection spring is about the inner housing and the plunger rod is in the inner diameter. The coupling has a spring rest and a shoulder. The coupling is in the inner diameter such that the spring rest extends through the first opening and receives the injection spring and such that the shoulder is compressed to a first position by the inner diameter. The shoulder is engaged with the rib in the first position.
[0011] The above-described and other features and advantages of the present disclosure will be appreciated and understood by those skilled in the art from the following detailed description, drawings, and appended claims.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0012] FIG. 1 is a perspective view of an exemplary embodiment of an auto-injection device according to the present disclosure;
[0013] FIG. 2 is a perspective view of a power-injection assembly of FIG. 1 shown before assembly;
[0014] FIG. 3 is a perspective view of a power-retraction assembly of FIG. I
shown before assembly;
shown before assembly;
[0015] FIG. 4 is a first cross sectional view of the power-injection assembly of FIG. 2 taken along lines 4-4;
[0016] FIG. 5 is a second cross sectional view of the power-injection assembly of FIG. 2 taken along lines 5-5;
[0017] FIG. 6 is a view of the power-injection assembly of FIG. 5 shown after activation;
[0018] FIG. 7 is a perspective view of an exemplary embodiment of a metal spring to plunger coupling according to the present disclosure; and [0019] FIG. 8 is a perspective view of an exemplary embodiment of an inner housing according to the present disclosure.
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE INVENTION
[0020] Referring to the figures and in particular to FIGS. 1 through 3, an exemplary embodiment of an auto-injection device 10 according to the present disclosure is shown in an assembled state. Auto-injection device 10 includes a power-injection assembly 12, a medicine cartridge 14, and a power-retraction assembly 16.
[0021]Auto-injection device 10 is configured to extend a hypodermic needle from within the device, inject a single, pre-measured dose of medicine from cartridge 14 into a user, and automatically retract the hypodermic needle into the device after the injection is completed.
[0022]Advantageously, syringe assembly 10 is a multi-component device that can be assembled by the user and/or medical provided (e.g., pharmacist, doctor, nurse). Since syringe assembly 10 does not require assembly at the time of manufacture, the present disclosure effectively separates expiry of medicine cartridge 14 from the expiry of syringe assembly 10. For example, typical flu vaccines have an expiration date of one year. Thus, the user can maintain a supply of power injection and retraction assemblies 12, 16 of the present disclosure, while only replacing any expired medicine cartridges 14.
[0023] For example, power-injection assembly 12 and power-retraction assembly 16 can be secured to one another in a snap fit manner so that the assemblies can not be removed from one another after injection. In the illustrated embodiment, power-injection assembly 12 includes one or more outwardly depending tabs 18 that are received in a corresponding number of openings 20 defined in power-retraction assembly 16. As power-injection assembly 12 is inserted into power-retraction assembly 16, tabs 18 act on the power-retraction assembly to elastically deform the inner dimension of the tube. Once tabs 18 are received by openings 20, the inner dimension of power-retraction assembly 16 resiliently returns to its original dimension to secure the tabs in the openings.
[0023] For example, power-injection assembly 12 and power-retraction assembly 16 can be secured to one another in a snap fit manner so that the assemblies can not be removed from one another after injection. In the illustrated embodiment, power-injection assembly 12 includes one or more outwardly depending tabs 18 that are received in a corresponding number of openings 20 defined in power-retraction assembly 16. As power-injection assembly 12 is inserted into power-retraction assembly 16, tabs 18 act on the power-retraction assembly to elastically deform the inner dimension of the tube. Once tabs 18 are received by openings 20, the inner dimension of power-retraction assembly 16 resiliently returns to its original dimension to secure the tabs in the openings.
[0024] In the assembled state, syringe assembly 10 preferably maintains cartridge 14 hermetically sealed between power-injection and retraction assemblies 12, 16. For example, power-injection assembly 12 can include a sealing member 22 such as, but not limited to an o-ring. Once power-injection assembly 12 and power-retraction assembly 16 are secured together, sealing member 22 cooperates with the interior of the power-retraction assembly to form a hermetic radial seal. In the illustrated embodiment, sealing member 22 is positioned below openings 20 defined in power-retraction assembly 16 to provide the hermetic seal below the snap fit connection between tabs 18 and openings 20.
[0025] The operation of the power-injection assembly 12 is described with simultaneous reference to FIGS. 4 through 8. Injection assembly 12 includes an injection spring 24, a plunger rod 26, an activation device 28, and a coupling (FIG. 7). Injection spring 24 is disposed about plunger rod 26 and is drivingly engaged to the plunger rod by coupling 30.
[0026] Activation device 28 has an upper end 32 and a lower end 34. Injection assembly 12 is activated by depressing activation device 28 in direction 48.
In addition, activation device 28 can include an outer shroud 36. Outer shroud 36 and injection assembly 12 can include one or more cooperating guides (not shown) that permit depression of activation device 28 only after the activation device has been rotated to a predetermined position. In sum, outer shroud 36 and injection assembly 12 can work together to require movement in two directions, rotation and depression, in order to activate injection spring 24.
In a preferred embodiment, shroud 36 includes a number of longitudinal ribs 38 to assist the user in rotation. In this manner, injection assembly 12 is particularly suited for use in situations where the user may lack typical manual dexterity, such as can be the case where the user is wherein protective gloves.
In addition, activation device 28 can include an outer shroud 36. Outer shroud 36 and injection assembly 12 can include one or more cooperating guides (not shown) that permit depression of activation device 28 only after the activation device has been rotated to a predetermined position. In sum, outer shroud 36 and injection assembly 12 can work together to require movement in two directions, rotation and depression, in order to activate injection spring 24.
In a preferred embodiment, shroud 36 includes a number of longitudinal ribs 38 to assist the user in rotation. In this manner, injection assembly 12 is particularly suited for use in situations where the user may lack typical manual dexterity, such as can be the case where the user is wherein protective gloves.
[0027] Lower end 34 is configured to selectively couple the energy from injection spring 24 to drive plunger rod 26. In the illustrated embodiment, plunger rod includes a driving end 38 and a locking end 40. Locking end 40 includes two tines 42 that are resiliently biased outward so that the tines are remote from one another. Driving end 38 is configured to act on medicine cartridge 14 in a known manner. For example, driving end 38 can act on medicine cartridge 14 as described in U.S. Patent No. 6,387,078.
[0028] Injection assembly 12 includes a locking member 44 that engages tines when the tines are normally biased from one another. Activation device 28 includes a releasing surface 46 defined at lower end 34. Force applied to upper end 32 of activation device 28 in direction 48 causes releasing surface 46 to compress tines 42 toward one another such that the tines are disengaged from locking member 44.
[0029] Injection spring 24 is maintained in a normally compressed or stressed condition. Upon release of tines 42 from locking member 44, the stored energy in spring 24 drives plunger rod 26 in an injection direction 48.
[0030] Coupling 30 includes a first end 50 and a second end 52. First end 50 forms a spring rest or seat 51 upon which injection spring 24 rests as shown in FIG. 4.
[0031]Second end 52 (shown in FIGS. 5 and 6) is an outwardly biased spring member having a shoulder 53 for engaging plunger rod 26. During assembly, second end 52 is compressed inward towards plunger rod 26 until shoulder 53 engages a rib 54 defined on plunger rod. Thus, second end 52 is moveable between a compressed or first position (FIG. 5) and a normal or second position (FIG. 6). Second end 52 is normally in the second position, but has sufficient resiliency such that the second end can be elastically urged to the first position.
[0032] During movement of plunger rod 26 in injection direction 48, second end 52 is maintained in the compressed position and, thus, shoulder 53 is maintained engaged with rib 54 so that the force of injection spring 24 is transmitted through coupling 30 to plunger rod 26.
[0033]After plunger rod 26 has traveled a predetermined distance, second end 52 is allowed to bias outward away from rod 26 so that shoulder 53 disengages from rib 54 as shown in FIG. 6. Thus, second end 52 moves from the compressed position to the normal position due to its own resiliency once plunger rod 26 travels the predetermined distance to disengage shoulder 53 from rib 54.
Once shoulder 53 is disengaged from rib 54, the force of injection spring 24 is no longer transmitted through coupling 30 to plunger rod 26.
Once shoulder 53 is disengaged from rib 54, the force of injection spring 24 is no longer transmitted through coupling 30 to plunger rod 26.
[0034] Preferably, coupling 30 includes a pair of spring rests 51 and a pair of shoulders 53. Here, spring rests 51 are, preferably, diametrically opposed to one another. Similarly, shoulders 53 are, preferably, diametrically opposed to one another. Moreover, spring rests 51 are, preferably, radially offset from shoulders 53 by a predetermined angle, preferably about 90 degrees. In this manner, each spring rest 51 is offset from each shoulder 53 by about by about 90 degrees.
[0035] Spring rests 51 are, preferably, axially offset from shoulders 53 by a predetermined distance so that coupling 30 has an axial length. In this manner, spring rests 51 are disposed forward relative to shoulders 53 along the axial length so that spring 24 encompasses a portion of the axial length.
[0036] For applications involving auto-injection devices 10 for small dose volumes deposited at shallow depths, the demand on injection spring 24, in terms of the spring rate and extension length, are not very severe. Thus, injection spring 24 can be incorporated into power-injection assembly 12 with a reasonable set of device proportions (e.g., length and diameter). However, in cases with auto-injection devices 10 that must deliver larger dose volumes deposited at deeper needle penetration depths, the demand on injection spring 24, in terms of the spring rate and extension length, can be severe. In these applications, injection spring 24 requires a long travel and high spring rate.
This combination of high spring rate arid long travel typically requires injection spring 24 to be a long, slender spring positioned in straight line sequence with the plunger, which unfortunately leads to power-injection assembly 12 having an undesireably long length. Alternately, the combination of high spring rate and long travel typically requires injection spring 24 to have a large diameter.
This combination of high spring rate arid long travel typically requires injection spring 24 to be a long, slender spring positioned in straight line sequence with the plunger, which unfortunately leads to power-injection assembly 12 having an undesireably long length. Alternately, the combination of high spring rate and long travel typically requires injection spring 24 to have a large diameter.
[0037]Advantageously, coupling 30 is particularly suited for use with such large diameter springs. Specifically, coupling 30 has spring rests 51 that are disposed radially outward from the coupling and are disposed forward of shoulders 53.
In this manner, injection spring 24 encompasses a portion of the axial length of coupling 30 so that the larger diameter spring axially overlaps at least a portion of plunger rod 26. According, coupling 30 finds particular use with large diameter springs to mitigate the overall length of power-injection assembly 12.
In this manner, injection spring 24 encompasses a portion of the axial length of coupling 30 so that the larger diameter spring axially overlaps at least a portion of plunger rod 26. According, coupling 30 finds particular use with large diameter springs to mitigate the overall length of power-injection assembly 12.
[0038] In the illustrated embodiment, injection assembly 12 includes an inner housing 56 shown in FIG. 8. Inner housing 56 defines has a first opening 58 through which spring rest 51 extends to engage injection spring 24. First opening 58 extends along inner housing 56 in the injection direction 48.
Preferably, inner housing 56 has a pair of first openings 58 that are defined through the inner housing diametrically opposed to one another to receive a pair of diametrically opposed spring rests 51.
Preferably, inner housing 56 has a pair of first openings 58 that are defined through the inner housing diametrically opposed to one another to receive a pair of diametrically opposed spring rests 51.
[0039] Inner housing 56 has an inner diameter 60 that is sufficient to maintain second end 52 of coupling 30 in the compressed position and, thus, engaged with plunger rod 26. Thus, second end 52 is outwardly biased against inner diameter 60 of inner housing 56. The force of injection spring 24 is sufficient to overcome the friction between second end 52 and housing 56.
[0040] Inner housing 56 also includes a second opening 62. Preferably, inner housing 56 has a pair of second openings 62 that are defined through the inner housing diametrically opposed to one another. Second opening 62 is offset from first opening 58 by the same predetermined angle that offsets spring rest 51 from shoulder 53. Thus, second opening 62 is aligned with shoulder 53 of coupling 30.
[0041] Second opening 62 is defined at a predefined position along injection direction 48 where it is desired for coupling 30 to disengage injection spring 24.
Thus, after plunger rod 26 has traveled to the point where second end 52 of coupling 30 is at second opening 62, the second end 52 is no longer maintained in the compressed position by inner diameter 60, which allows the second end to resiliently bias outward to the first position through the second opening and move shoulder 53 out of engagement with rib 54.
Thus, after plunger rod 26 has traveled to the point where second end 52 of coupling 30 is at second opening 62, the second end 52 is no longer maintained in the compressed position by inner diameter 60, which allows the second end to resiliently bias outward to the first position through the second opening and move shoulder 53 out of engagement with rib 54.
[0042]Advantageously, coupling 30 can be made of any niaterial having sufficient resiliency to bias second end 52 outward at second opening 62. For example, coupling 30 can be made of spring steel stamped into the desired shape such as that illustrated in FIG. 7. Accordingly, coupling 30 can be made less expensively and with lower manufacturing tolerances than previous couplings.
[0043] In this manner, injection spring 24 drives plunger rod 26 in injection direction 48 until second end 52 of coupling 30 reaches second opening 52. The resiliency of coupling 30 causes the coupling to expand through second opening 52 and disengage shoulder 53 from rib 54 of plunger rod 26 as seen in FIG. 6.
The disengagement of coupling 30 from plunger rod 26 frees the plunger rod from the force of injection spring 24 and, thus, allows the plunger rod to be moved in a direction opposite injection direction 48 by retraction assembly 16.
The disengagement of coupling 30 from plunger rod 26 frees the plunger rod from the force of injection spring 24 and, thus, allows the plunger rod to be moved in a direction opposite injection direction 48 by retraction assembly 16.
[0044] Retraction assembly 16 can operate in a known manner. For example, power-retraction assembly 16 can include a retraction spring (not shown) that has a spring force lower than the spring force of injection spring 24. Thus, injection spring 24 overcomes the force of the retraction spring as long as coupling 30 engages plunger rod 26 to the injection spring. However, once second end 52 of coupling 30 is disengaged from plunger rod 26 and the force of injection spring 24 is no longer transmitted through the coupling to the plunger rod, the force of the retraction spring is sufficient to urge medicine cartridge 14 in a direction opposite injection direction 48, thus automatically retracting the hypodermic needle of cartridge 14 into device 10.
[0045] It should be noted that the terms "first", "second", "third", "upper", "lower", and the like may be used herein to modify various elements. These modifiers do not imply a spatial, sequential, or hierarchical order to the modified elements unless specifically stated.
[0046] While the present disclosure has been described with reference to one or more exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure.
In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular embodiment(s) disclosed as the best mode contemplated, but that the disclosure will include all embodiments falling within the scope of the appended claims.
In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular embodiment(s) disclosed as the best mode contemplated, but that the disclosure will include all embodiments falling within the scope of the appended claims.
Claims (20)
- Claim 1. ~A coupling for selectively securing a spring to a plunger, comprising:
a first end defining a spring rest for receiving the spring; and a second end defining a shoulder, said shoulder being moveable to a first position into contact with the plunger and a second position out of contact with the plunger, wherein said shoulder is normally in said second position and is resiliently moveable to said first position. - Claim 2. ~The coupling of claim 1, wherein said spring rest and said shoulder are radially offset from one another by a predetermined angle.
- Claim 3. ~The coupling of claim 2, wherein said predetermined angle comprises about 90 degrees.
- Claim 4. ~The coupling of claim 1, wherein the coupling comprises spring steel.
- Claim 5. ~A coupling for selectively securing a spring to a plunger, comprising:
a first end defining a spring rest for receiving the spring; and a second end defining a shoulder, said shoulder being moveable to a first position into contact with the plunger and a second position out of contact with the plunger, wherein said spring rest and said shoulder are radially offset from one another by a predetermined angle. - Claim 6. ~The coupling of claim 5, wherein said predetermined angle comprises about 90 degrees.
- Claim 7. ~The coupling of claim 5, wherein the coupling comprises spring steel.
- Claim 8. ~A coupling for selectively securing a spring to a plunger, comprising:
a first end defining a pair of spring rests for receiving the spring; and a second end defining a pair of shoulders, said pair of shoulders being moveable to a first position into contact with the plunger and a second position out of contact with the plunger when in said second position. - Claim 9. ~The coupling of claim 8, wherein said pair of shoulders are normally in said second position and is resiliently moveable to said first position.
- Claim 10. ~The coupling of claim 8, wherein said pair of spring rests are diametrically opposed to one another.
- Claim 11. ~The coupling of claim 8, wherein said pair of shoulders are diametrically opposed to one another.
- Claim 12. ~The coupling of claim 8, wherein said pair of spring rests are offset from said pair of shoulders by a predetermined angle.
- Claim 13. ~The coupling of claim 8, wherein said pair of spring rests are radially offset and axially offset relative to said pair of shoulders.
- Claim 14. ~A power injection assembly, comprising:
a plunger rod having a rib;
an injection spring;
an inner housing having a first opening and an inner diameter, said injection spring being disposed about said inner housing and said plunger rod being disposed in said inner diameter; and a coupling having a spring rest and a shoulder, said coupling being disposed in said inner diameter such that said spring rest extends through said first opening and receives said injection spring and such that said shoulder is compressed to a first position by said inner diameter, said shoulder being engaged with said rib in said first position. - Claim 15. ~The assembly of claim 14, wherein said inner housing further comprises a second opening defined at a predetermined position along an injection direction
- Claim 16. ~The assembly of claim 15, wherein said second opening allows said shoulder to resiliently bias through said inner housing to a second position, said shoulder being disengaged from said rib in said second position.
- Claim 17. ~The assembly of claim 15, wherein said injection spring acts on said coupling to urge said plunger in said injection direction.
- Claim 18. ~The assembly of claim 15, further comprising an activation device said activation device maintaining said injection spring in a compressed state, said shoulder being remote from said second opening in said compressed state.
- Claim 19. ~The assembly of claim 18, wherein said activation device releases said injection spring from said compressed state upon movement of said activation device in two directions.
- Claim 20. ~The assembly of claim 14, wherein said spring rest is radially offset and axially offset relative to said shoulder.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US63448604P | 2004-12-09 | 2004-12-09 | |
US60/634,486 | 2004-12-09 | ||
PCT/US2005/044410 WO2006063123A2 (en) | 2004-12-09 | 2005-12-08 | Coupling for an auto-injection device |
Publications (1)
Publication Number | Publication Date |
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CA2590281A1 true CA2590281A1 (en) | 2006-06-15 |
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Application Number | Title | Priority Date | Filing Date |
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CA002590281A Abandoned CA2590281A1 (en) | 2004-12-09 | 2005-12-08 | Coupling for an auto-injection device |
CA002591278A Abandoned CA2591278A1 (en) | 2004-12-09 | 2005-12-08 | Automatic injection and retraction syringe |
CA002591420A Abandoned CA2591420A1 (en) | 2004-12-09 | 2005-12-08 | Breech loaded fixed needle syringe and automatic injection device having the same |
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Application Number | Title | Priority Date | Filing Date |
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CA002591278A Abandoned CA2591278A1 (en) | 2004-12-09 | 2005-12-08 | Automatic injection and retraction syringe |
CA002591420A Abandoned CA2591420A1 (en) | 2004-12-09 | 2005-12-08 | Breech loaded fixed needle syringe and automatic injection device having the same |
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US (3) | US20060178642A1 (en) |
EP (3) | EP1819387A4 (en) |
JP (3) | JP4588072B2 (en) |
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CA (3) | CA2590281A1 (en) |
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- 2005-12-08 BR BRPI0518961-6A patent/BRPI0518961A2/en not_active Application Discontinuation
- 2005-12-08 AU AU2005313993A patent/AU2005313993A1/en not_active Abandoned
- 2005-12-08 CA CA002590281A patent/CA2590281A1/en not_active Abandoned
- 2005-12-08 EP EP05853420A patent/EP1819387A4/en not_active Withdrawn
- 2005-12-08 WO PCT/US2005/044410 patent/WO2006063123A2/en active Search and Examination
- 2005-12-08 AU AU2005314034A patent/AU2005314034A1/en not_active Abandoned
- 2005-12-08 US US11/297,159 patent/US20060178642A1/en not_active Abandoned
- 2005-12-08 WO PCT/US2005/044492 patent/WO2006063172A2/en active Search and Examination
- 2005-12-08 AU AU2005314035A patent/AU2005314035A1/en not_active Abandoned
- 2005-12-08 MX MX2007006974A patent/MX2007006974A/en unknown
- 2005-12-08 EP EP05853353.0A patent/EP1819386B1/en active Active
- 2005-12-08 WO PCT/US2005/044411 patent/WO2006063124A2/en active Application Filing
- 2005-12-08 JP JP2007545641A patent/JP2008522754A/en active Pending
- 2005-12-08 CA CA002591278A patent/CA2591278A1/en not_active Abandoned
- 2005-12-08 CA CA002591420A patent/CA2591420A1/en not_active Abandoned
- 2005-12-08 US US11/296,973 patent/US7674246B2/en active Active
- 2005-12-08 BR BRPI0518960-8A patent/BRPI0518960A2/en not_active Application Discontinuation
- 2005-12-08 MX MX2007006975A patent/MX2007006975A/en unknown
- 2005-12-08 EP EP05853354.8A patent/EP1819380B1/en active Active
- 2005-12-08 CN CN2005800472942A patent/CN101146562B/en active Active
- 2005-12-08 US US11/297,225 patent/US7758548B2/en active Active
- 2005-12-08 MX MX2007006973A patent/MX2007006973A/en unknown
- 2005-12-08 CN CN2005800470010A patent/CN101180090B/en active Active
- 2005-12-08 JP JP2007545617A patent/JP5198072B2/en active Active
- 2005-12-08 BR BRPI0518978-0A patent/BRPI0518978A2/en not_active Application Discontinuation
- 2005-12-08 CN CNA2005800467361A patent/CN101484198A/en active Pending
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2007
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- 2007-06-07 IL IL183768A patent/IL183768A0/en unknown
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