WO2004082747A1 - Syringe spring retainer - Google Patents

Syringe spring retainer Download PDF

Info

Publication number
WO2004082747A1
WO2004082747A1 PCT/AU2004/000354 AU2004000354W WO2004082747A1 WO 2004082747 A1 WO2004082747 A1 WO 2004082747A1 AU 2004000354 W AU2004000354 W AU 2004000354W WO 2004082747 A1 WO2004082747 A1 WO 2004082747A1
Authority
WO
WIPO (PCT)
Prior art keywords
body member
plunger
spring
syringe
spring retainer
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.)
Ceased
Application number
PCT/AU2004/000354
Other languages
English (en)
French (fr)
Inventor
Joseph Hermes Kaal
Craig Stephen Thorley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unitract Syringe Pty Ltd
Original Assignee
Unitract Syringe Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2003901301A external-priority patent/AU2003901301A0/en
Priority claimed from AU2003905080A external-priority patent/AU2003905080A0/en
Priority to DK04721775.7T priority Critical patent/DK1608421T3/da
Priority to NZ542635A priority patent/NZ542635A/en
Application filed by Unitract Syringe Pty Ltd filed Critical Unitract Syringe Pty Ltd
Priority to MXPA05009932A priority patent/MXPA05009932A/es
Priority to EP04721775.7A priority patent/EP1608421B1/en
Priority to JP2006503971A priority patent/JP4652326B2/ja
Priority to US10/549,710 priority patent/US8021333B2/en
Priority to CA2518360A priority patent/CA2518360C/en
Priority to AU2004222676A priority patent/AU2004222676B2/en
Priority to HK06111515.7A priority patent/HK1090859B/xx
Priority to ES04721775T priority patent/ES2424947T3/es
Publication of WO2004082747A1 publication Critical patent/WO2004082747A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—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
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle 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
    • A61M5/31—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
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3231—Proximal end of needle captured or embedded inside piston head, e.g. by friction or hooks

Definitions

  • SYRINGE SPRING RETAINER FIELD OF THE INVENTION relates to a spring retainer for a syringe. More particularly, this invention relates to a spring retainer for a single-use, retractable syringe that facilitates prevention of syringe and/or needle re-use
  • the present invention provides a spring retainer for a syringe that provides efficient retraction of a spent needle into the barrel of a retractable syringe while also having improved tactile properties to a syringe user.
  • the invention provides a spring retainer for a syringe that comprises a barrel, a plunger, a spring and a retractable needle, said spring retainer adapted to releasably maintain said spring in a compressed state until decompression of said spring is required to facilitate retraction of said retractable needle into said barrel.
  • the invention provides a syringe comprising a barrel, a plunger, a spring retainer and a spring, to which syringe a retractable needle is mountable so as to be capable of coupling with said plunger for retraction of said needle into said barrel, said spring retainer adapted to releasably maintain said spring in a compressed state until decompression of said spring is required to facilitate retraction of said retractable needle into said barrel.
  • the syringe is adapted so that a retractable needle is mountable thereto.
  • said syringe is a retractable syringe having a retractable needle, in use said spring is compressed in said retainer until at or near completion of depression of said plunger to inject material from said syringe, decompression of said spring acting thereafter to facilitate withdrawal of said retractable needle into said barrel.
  • said spring retainer has a housing that comprises a first body member and second body member which are releasably engageable to maintain said spring in an initial compressed state.
  • disengagement of said first body member and second body member allows or facilitates decompression of said spring.
  • said plunger comprises means for engaging said housing to trigger, initiate, actuate or otherwise begin disengagement of said first body member and second body member.
  • Such means may be in the form of one or more shoulders, tabs, flanges or other projections which can engage one or more, respective complementary mating portions of said housing.
  • said one or more, respective complementary mating portions of said housing may be in the form of ramps, slots, depressions, recesses or the like which in use can be engaged by said plunger means for engaging said housing.
  • disengagement of said first body member and second body member is accompanied by rotation of said second body member relative to said first body member, which in turn assists rotation of said plunger, when said retractable needle is coupled therewith, into a final, inoperable position.
  • FIG. 1 is a cross-sectional view of a retractable single use syringe
  • FIG.2 is a side view of an embodiment of a retractable needle mounted to a syringe barrel.
  • FIG.3 A and 3B are respective sectional views of a spring retainer mounted to a syringe
  • FIG.4 A and 4B are exploded perspective views of a plunger and a first body member of a spring retainer housing
  • FIG.5 is an exploded perspective view of spring retainer, spring and plunger
  • FIG. 6 is an exploded perspective view of spring retainer and plunger
  • FIG. 7 is an exploded perspective view of disengagement of a first body member and a second body member of a spring retainer.
  • syringe 10 has plunger 20, barrel 40, retractable needle 50 and spring retainer 60.
  • Spring retainer 60 is located in flared 80 that co-operate to house and maintain spring 90 in the initial compressed state shown in FIG. 1.
  • Syringe 10 also comprises seal 11 located on plunger 20, which prevents leakage fluid between plunger 20 and internal wall 42 of barrel 40.
  • Retractable needle 50 is mounted at needle end 44 of barrel 40 and comprises cannula 51 and barbed arms 52A, 52B mounted to body 53 that are engageable by respective barb-engaging apertures 22 of needle-engaging means 23 in plunger 20 to facilitate retraction of needle 50 at the end of delivery of the fluid contents of syringe 10. This retraction is driven by de-compression of spring 90, as will be described in more detail hereinafter.
  • retractable needle 50 may be fitted at needle end 44 of barrel 40 by disc member 100 that has indent 101 which co-operates with annular rib 46 on inside wall 42 of barrel 40.
  • O-ring seal 47 is seated in annular step 48 in barrel wall 42.
  • Body 53 of retractable needle 50 has elbows 54A, 54B that are held by annular shoulder 104 of disc member 100 until retraction of retractable needle 50.
  • barbed arms 52A, 52B each comprise first barb 55A, 55B and second barb 56A, 56B.
  • First barbs 55A, 55B provide a safety mechanism should second barbs 56A, 56B not properly engage respective barb-engaging apertures 22 to facilitate retraction of retractable needle 50.
  • first barbs 55A, 55B can engage barb-engaging apertures 22 should second barbs 56 A, 56B fail to properly engage respective apertures 22.
  • Disc member 100 has aperture 102 with recesses 103 A, 103B which allow longitudinal movement of elbows 54A, 54B therethrough to allow retraction of needle 50. Alignment of elbows 54A, 54B is achieved when retractable needle 50 is rotated by plunger 20 engaged therewith during retraction, as will be described in more detail hereinafter.
  • retractable needle 50 may be provided such as described in Australian Patent 731159 and United States Patent 6,083,199.
  • plunger 20 further comprises plunger shaft
  • Barrel 40 is integrally formed with finger grips 43 A, 43B and flared end 41 into which is fitted spring retainer 60.
  • Spring retainer 60 may be fitted into flared end 1 of barrel 0 such as by an interference fit whereby first body member 70 engages wall 42 of barrel 40 as shown in FIG.3 A. According to this embodiment, first body member 70 is held in barrel 40 by clips 79 A, 79B engaging respective steps 45 A, 45B in wall 42.
  • plunger 20 An understanding of the operation of plunger 20, with particular regard to rotation of plunger 20 and alignment of needle engaging means 23 with retractable needle barbs 52A, 52B to facilitate needle 50 retraction can be gained by referring now to FIG. 4A and FIG. 4B.
  • Plunger 20 includes first slot 24, second slot 25, retraction slot 26 and fourth slot 27.
  • First slot 24 is interconnected to second slot 25 via first deviation 28
  • second slot 25 is interconnected to retraction slot 26 via second deviation 29
  • retraction slot 26 is interconnected to fourth slot 27 via third deviation 30
  • fourth slot 27 is interconnected to first slot 24 via fourth deviation 31.
  • first deviation 28 and third deviation 30 are longitudinally offset with respect to each other; and second deviation 29 and fourth deviation 31 are longitudinally offset with respect to each other; as indicated by arrows in FIG. 4 A and FIG 4B.
  • Second slot 25 comprises plurality of abutments 21 A
  • first slot 24 includes first slot abutment 21B
  • retraction slot 26 includes plurality of retraction abutments 21 C and lockout abutment 2 ID.
  • first body member 70 of spring retainer 60 which comprises body 71 and collar 72 having first plunger aperture 74 that slidably accommodates plunger 20, and first finger or projection 73 A and second finger or projection 73 B which are oriented so as to be longitudinally opposed to each other.
  • First body member 70 further comprises respective tabs 75 A, 75B inside body 71.
  • first finger or projection 73A and second finger or projection 73B engage a respective corresponding slot 24, 25, 26, or 27 as in FIG 4 A or as in FIG. 4B.
  • Fingers 73 A, 73B can respectively engage abutments 21 A, 21 B, 21 C in slots of plunger 20 to facilitate prevention of re-use of plunger 20, in a manner similar to that described in International Publication WO 01/80930, as will be described in more detail hereinafter.
  • projections 73 A, 73B may be spherical or approximately so, to thereby smoothly, slidably engage slots that are appropriately configured to receive such spherical projections.
  • spring retainer 60 comprises first body member 70 and second body member 80 that when fitted together, co-operate to releasably maintain spring 90 in an initial, compressed state.
  • Second body member 80 comprises second plunger aperture 81 that slidably accommodates plunger 20. Second body member 80 also comprises shoulder ramps 82A, 82B and shoulder recesses 83A, 83B. Also present on external wall 84 of second body member 80 are circumferential ramps 85A, 85B which at one end have respective guides 86A, 86B and at an opposite end have respective scalloped recesses 87A, 87B.
  • First body member 70 and second body member 80 are fitted together on plunger 20 to compress spring 90 by way of guides 86A, 86B in sidewall 84 of second body member 80 receiving respective tabs 75 A, 75B of first body member 70 and rotating second body member 80 relative to first body member 70 so that tabs
  • second body member 80 When spring retainer 60 is assembled, second body member 80 is capable of limited, longitudinal or telescopic movement relative to first body member 70 against the action of compressed spring 90 without disengaging tabs 75A, 75B from scalloped recesses 87A, 87B and hence without inadvertently disengaging second body member 80 from first body member 70.
  • this movement is limited to 0.1 to 1.0 mm, preferably to about 0.2 to 0.8 mm or advantageously to about 0.5 mm, although this is readily varied according to the length and/or volume of the syringe, plunger and/or spring.
  • Engagement between tabs 75 A, 75B and scalloped recesses 87A, 87B limits rotation of second body member 80 relative to first body member 70 to no more than about 5°.
  • Rotation of plunger 20 during syringe filling, injection and needle 50 retraction may best be understood with reference to FIG. 4A and FIG. 4B and also with reference to International Publication WO 01/80930
  • first projection 73A is located in first slot 24 and second projection 73B is located in retraction slot 26.
  • plunger 20 Withdrawal of plunger 20 is followed by first projection 73 A slidably moving from first slot 24 into second slot 25 via first deviation 28 and second projection 73B slidably moving from retraction slot 26 into fourth slot 27 via third deviation 30. This causes a 90° rotation of plunger 20 with respect to barrel 50.
  • shoulders 33A, 33B are free to slidably travel through respective shoulder recesses 83A, 83B in second body member 80. Depression of plunger 20 to inject or expel material from barrel 40 occurs when first projection 73A is slidably located in second slot 25 and second projection 73 B is slidably located in fourth slot 27.
  • barb-engaging apertures 22 of plunger 20 are aligned so as to be engageable with barbed arms 52A, 52B of retractable needle 50.
  • spring 90 remains compressed by spring retainer 60 and only towards the end of depression of plunger 20 can decompression of spring 90 occur.
  • FIG.6 Initiation of disengagement of second body member 80 from first body member 70 is shown on FIG.6, where inclined surfaces 34A, 34B of shoulders 33 A, 33B of plunger 20 engage respective shoulder ramps 82A, 82B to move second body member 80 longitudinally to further compress spring 90.
  • This is accompanied by barb-engaging apertures 22 respectively engaging barbs 52A, 52B of retractable needle 50 to thereby couple plunger 20 to retractable needle 50.
  • inclined surfaces 34A, 34B of respective shoulders 33 A, 33B of plunger 20 ensure only "last-minute” engagement of shoulder ramps 82A, 82B in second body member 80 at the very end of plunger 20 depression. Longitudinal movement of second body member 80 relative to first body member 70 is driven by lineal movement of plunger 20 which itself is unable to rotate because of first projection 73 A engaging second slot 25 and second projection 73B engaging fourth slot 27 of plunger 20.
  • Second body member 80 Force applied to plunger 20 by the user during plunger 20 depression is transferred to second body member 80 via engagement between inclined surfaces 34A, 34B of respective shoulders 33A, 33B and shoulder ramps 82 A, 82B in second body member 80, which rotates second body member 80 relative to first body member 70 (which cannot rotate) enough to release engagement of scalloped recesses 87A, 87B by respective tabs 75 A, 75B.
  • This release initiates disengagement of second body member 80 from first body member 70, thereby allowing spring 90 to decompress which, in turn, forces circumferential ramps 85 A, 85B of second body member 80 to slide against tabs 75 A, 75B of first body member 70 (which cannot rotate), thereby forcing rotation of second body member 80 relative to first body member 70 as it disengages first body member 70.
  • This force is relayed to plunger 20 by second body member 80 bearing against shoulders 33A, 33B of plunger 20 thereby forcing rotation and retraction of plunger 20 and retractable needle 50.
  • retractable needle 50 and plunger 20 coupled thereto are retracted into a final inoperable position, whereby projections 73B, 73 A respectively engage abutment 2 IB in first slot 24 and abutment 2 ID in retraction slot 26 to prevent depression or further withdrawal of plunger 20 after retraction of retractable needle 50 into barrel 40.
  • second body member 80 As second body member 80 becomes disengaged from first body member 70, it travels axially with plunger 20, driven by decompressed spring 90. Accordingly, second body member 80 travels axially until circumferential ramps 85A, 85B are respectively engaged by tabs 75A, 75B in first body member 70 thereby forcing second body member 80 to rotate in the direction shown by the arrow, which in turn rotates plunger 20 by virtue of engagement between shoulders 33 A, 33B of plunger 20 and shoulder ramps 82A, 82B of second body member 80.
  • second body member 80 shown in FIG.7 has extended neck portion 88 wherein shoulder ramps 82 A, 82B are somewhat recessed inside second body member 80 compared to the embodiment shown in FIG. 4 or FIG. 5, for example. This assists prevention of a user tampering with engagement between plunger 20 and second body member 80 by effectively "burying" this inside second body member 80.
  • ribs 89A, 89B which engage shoulders 33A, 33B of plunger 20 and prevent a user forcing rotation of plunger 20 relative to second body member 80.
  • plunger shoulders 33 A, 33B having sufficient length (longitudinally along plunger shaft 21), it is possible to prevent rotation of plunger 20 when projections 73 A, 73B have not yet respectively engaged retraction slot 26 and first slot 24 at the start of plunger 20 withdrawal. This assists prevention of a user seeking to rotate plunger 20 back into an operable position before withdrawal has commenced.
  • spring retainer 60 of the invention can accommodate a spring 90 of various sizes, such as being operable with varying needle sizes and syringe sizes. In the higher volume syringes with longer needles, the length of spring 90 required to facilitate retraction of plunger 20 may be too great to fit easily on plunger 20 external to barrel 40. Spring retainer 60 compresses spring 90 into a manageable size despite the uncompressed length of spring 90.
  • plunger means for engaging second body member 80 and the respective, complementary mating portions on second body member 80 may be any suitable arrangement not limited to shoulders 33A, 33B and shoulder ramps 82A, 82B as described herein.
  • tabs 75 A, 75B and scalloped recesses 87A, 87B are examples of means for releasably coupling said first body member 70 and second body member 80
  • the invention contemplates any other arrangements that utilize complementary mating portions on first body member 70 and second body member 80 to facilitate releasable coupling of said first body member 70 and second body member 80 to form said housing and thereby maintain spring 90 in an initial compressed state.
  • circumferential ramps 85A, 85B are replaced by respective channels or guide slots which allow tabs 75A, 75B to move longitudinally during disengagement of first body member 70 and second body member 80, without forcing rotation of second body member 80 and plunger 20 engaged therewith.
  • abutments 21A, 21B, 21C and 21D described herein may be in the form of ledges, gates, ridges or any other means for restricting plunger movement as desired by the skilled person.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
PCT/AU2004/000354 2003-03-20 2004-03-19 Syringe spring retainer Ceased WO2004082747A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
HK06111515.7A HK1090859B (en) 2003-03-20 2004-03-19 Syringe spring retainer
ES04721775T ES2424947T3 (es) 2003-03-20 2004-03-19 Medio de retención de muelle de jeringuilla
CA2518360A CA2518360C (en) 2003-03-20 2004-03-19 Syringe spring retainer
DK04721775.7T DK1608421T3 (da) 2003-03-20 2004-03-19 Sprøjtefjederlås
MXPA05009932A MXPA05009932A (es) 2003-03-20 2004-03-19 Retenedor de resorte de jeringa.
EP04721775.7A EP1608421B1 (en) 2003-03-20 2004-03-19 Syringe spring retainer
JP2006503971A JP4652326B2 (ja) 2003-03-20 2004-03-19 シリンジ用バネ式リテーナ
US10/549,710 US8021333B2 (en) 2003-03-20 2004-03-19 Syringe spring retainer
NZ542635A NZ542635A (en) 2003-03-20 2004-03-19 Syringe spring retainer
AU2004222676A AU2004222676B2 (en) 2003-03-20 2004-03-19 Syringe spring retainer

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU2003901301 2003-03-20
AU2003901301A AU2003901301A0 (en) 2003-03-20 2003-03-20 Syringe spring retainer
AU2003905080 2003-09-18
AU2003905080A AU2003905080A0 (en) 2003-09-18 Syringe spring retainer II

Publications (1)

Publication Number Publication Date
WO2004082747A1 true WO2004082747A1 (en) 2004-09-30

Family

ID=33030374

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2004/000354 Ceased WO2004082747A1 (en) 2003-03-20 2004-03-19 Syringe spring retainer

Country Status (15)

Country Link
US (1) US8021333B2 (enExample)
EP (2) EP1608421B1 (enExample)
JP (1) JP4652326B2 (enExample)
AR (1) AR043668A1 (enExample)
CA (1) CA2518360C (enExample)
CL (1) CL2004000581A1 (enExample)
DK (1) DK1608421T3 (enExample)
ES (1) ES2424947T3 (enExample)
MX (1) MXPA05009932A (enExample)
MY (1) MY141268A (enExample)
NZ (1) NZ542635A (enExample)
PE (1) PE20050098A1 (enExample)
PT (1) PT1608421E (enExample)
TW (1) TWI253944B (enExample)
WO (1) WO2004082747A1 (enExample)

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US7811259B2 (en) 2004-09-03 2010-10-12 L.O.M. Laboratories Inc. Single-use pneumatic safety syringe providing gas-driven needle retraction
US8790313B2 (en) 2009-06-17 2014-07-29 Unitract Syringe Pty Ltd Syringe adapter
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US10300217B2 (en) 2013-11-15 2019-05-28 Credence Medsystems, Inc. System and method for drug delivery with a safety syringe
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US10709847B2 (en) 2015-01-20 2020-07-14 L.O.M. Laboratories Inc. Retractable needle syringe with unitary propellant release module
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MXPA05009932A (es) 2006-03-21
US8021333B2 (en) 2011-09-20
TW200418543A (en) 2004-10-01
AR043668A1 (es) 2005-08-03
PT1608421E (pt) 2013-07-26
US20060235354A1 (en) 2006-10-19
TWI253944B (en) 2006-05-01
MY141268A (en) 2010-04-16
JP2006520219A (ja) 2006-09-07
CL2004000581A1 (es) 2005-01-21
EP1608421A1 (en) 2005-12-28
PE20050098A1 (es) 2005-05-11
DK1608421T3 (da) 2013-07-01
CA2518360A1 (en) 2004-09-30
EP1608421B1 (en) 2013-05-15
HK1090859A1 (zh) 2007-01-05
CA2518360C (en) 2011-12-20
NZ542635A (en) 2006-10-27
EP2596824A1 (en) 2013-05-29
ES2424947T3 (es) 2013-10-10
EP1608421A4 (en) 2011-11-09
JP4652326B2 (ja) 2011-03-16
EP2596824B1 (en) 2017-04-19

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