GB2202747A - Syringes - Google Patents

Syringes Download PDF

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Publication number
GB2202747A
GB2202747A GB08800929A GB8800929A GB2202747A GB 2202747 A GB2202747 A GB 2202747A GB 08800929 A GB08800929 A GB 08800929A GB 8800929 A GB8800929 A GB 8800929A GB 2202747 A GB2202747 A GB 2202747A
Authority
GB
United Kingdom
Prior art keywords
syringe
barrel
shroud
means
plunger means
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.)
Withdrawn
Application number
GB08800929A
Other versions
GB8800929D0 (en
Inventor
Dr William Ducat
Original Assignee
Dr William Ducat
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 to GB878700976A priority Critical patent/GB8700976D0/en
Priority to GB878718275A priority patent/GB8718275D0/en
Application filed by Dr William Ducat filed Critical Dr William Ducat
Publication of GB8800929D0 publication Critical patent/GB8800929D0/en
Publication of GB2202747A publication Critical patent/GB2202747A/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; 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
    • A61M5/34Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
    • A61M5/348Constructions for connecting the needle, e.g. to syringe nozzle or needle hub snap lock, i.e. upon axial displacement of needle assembly
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/315Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; 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
    • A61M5/3205Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321Means for protection against accidental injuries by used needles
    • A61M5/3243Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3257Semi-automatic sleeve extension, i.e. in which triggering of the sleeve extension requires a deliberate action by the user, e.g. manual release of spring-biased extension means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50Devices 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
    • A61M5/5013Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50Devices 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
    • A61M5/5066Means for preventing re-use by disconnection of piston and piston-rod
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; 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
    • A61M5/3205Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321Means for protection against accidental injuries by used needles
    • A61M5/3243Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3245Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3246Constructional features thereof, e.g. to improve manipulation or functioning being squeezably deformable for locking or unlocking purposes, e.g. with elliptical cross-section
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; 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
    • A61M5/3205Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321Means for protection against accidental injuries by used needles
    • A61M5/3243Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3245Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3247Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
    • A61M2005/325Means obstructing the needle passage at distal end of a needle protection sleeve
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; 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
    • A61M5/3205Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321Means for protection against accidental injuries by used needles
    • A61M5/3243Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/326Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
    • A61M2005/3267Biased sleeves where the needle is uncovered by insertion of the needle into a patient's body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; 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
    • A61M5/34Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
    • A61M2005/342Off-center needles, i.e. needle connections not being coaxial with the longitudinal symmetry axis of syringe barrel
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50Devices 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
    • A61M5/5066Means for preventing re-use by disconnection of piston and piston-rod
    • A61M2005/5073Means for preventing re-use by disconnection of piston and piston-rod by breaking or rupturing the connection parts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/315Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M5/31515Connection of piston with piston rod
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; 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
    • A61M5/3205Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321Means for protection against accidental injuries by used needles
    • A61M5/3243Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3271Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel with guiding tracks for controlled sliding of needle protective sleeve from needle exposing to needle covering position
    • A61M5/3272Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel with guiding tracks for controlled sliding of needle protective sleeve from needle exposing to needle covering position having projections following labyrinth paths

Abstract

Disclosed are syringes characterised by:- 1) An axially slidable sleeve attached to the barrel which can be positioned to shield the needle. The shroud may be spring biassed and lockable in position and may be rotatable to accomodate an off-centre needle. 2) The push-rod being detachable from the piston by means of a rotary breakaway mechanism. 3) Prevention of push-rod retraction e.g. by piston retaining means in the barrel, an axial pull break-away mechanism (e.g. ball and socket joint) or a rod, which may be telescopic, which disappears within the barrel on use. 4) A needle retaining nozzle having locking retaining means for the needle, the nozzle optionally being weakened so as to break off if needle removal is attempted. a

Description

"Improvements in or Relating to Syrin#es" The present invention relates to medical syringes and is particularly concerned with eliminating or reducing the risk of infection by contact with or re-use of hypodermic syringes.

Disposable syringes are in widespread use throughout the medical profession and once used are regarded as being infected and are discarded. There remains the risk, however, that persons may be infected by used syringes, such as by accidentally stabbing themselves with a used needle, or that used syringes may be stolen prior to incineration and re-used by drug addicts.

Thus, it is an object of the present invention to obviate or mitigate the aforesaid risks.

Even when drug addicts obtain or are supplied with sterile, un-used syringes and needles, the problem of reuse among addicts still remains. Accordingly, it is a further object of the present invention to obviate or mitigate this problem.

In accordance with a first aspect of the invention, a syringe comprising a barrel, plunger means slidable within said barrel and a hypodermic needle extending from one end of said barrel is provided with a generally tubular shroud slidable along the long axis of said barrel between a first position wherein said shroud surrounds said barrel and a second position wherein said shroud projects beyond said one end of said barrel to shield said needle.

The shroud and barrel are preferably provided with co-operating projections and indentations whereby said shroud may be releasably retained in either of said first and second positions.

Alternatively, the shroud may be biased towards the second position by bias means.

Preferably, the shroud is lockable in said second position.

Preferably also the bias means comprises a coil spring located inside the shroud between the front end thereof and the front end of the barrel of the syringe.

According to a second aspect of the invention, a syringe includes a barrel, plunger means slidable within said barrel and an actu#ating member extending rearwardly from said plunger means, wherein said barrel and said plunger means are adapted to be non-rotatable with respect to one another so that the actuating member may be broken after use by twisting.

Preferably, said barrel and said plunger means are of complementary, non-circular section and said actuating member is weakened at a point adjacent said plunger means so as to be relatively weak in torsion.

It is particularly preferred that the barrel and plunger means are oval in section.

According to a third aspect of the invention, a syringe comprising a barrel, plunger means slidable within said barrel and an actuating member extending rearwardly from said plunger means is adapted to prevent withdrawl of said plunger means once it has been pushed home.

Preferably, means are provided to retain said plunger means within said barrel once it has been pushed home.

Preferably also, said actuating member is adapted to be relatively strong in compression and relatively weak in tension such that it breaks or comes apart if an attempt is made to withdraw it after use.

Alternatively, said actuating member is of variable length such that the rearward end thereof is lost within said barrel once the plunger means is pushed home.

According to-a fourth aspect of the invention, a syringe includes a barrel having a nozzle extending from the end thereof to receive a hypodermic needle located in a collar, said collar being adapted to fit over said nozzle, and said nozzle and said collar are provided with co-operating retaining means for preventing subsequent removal of said needle once it has been fitted onto the syringe.

Preferably said retaining means comprises cooperating projections and indentions formed on the exterior of said nozzle and the interior of said collar.

Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings in which: Fig. 1 is a side view, partly in section, of a syringe embodying a first aspect of the invention; Fig. 2 is a sectional side view of a syringe embodying a second aspect of the invention; Fig. 3 is a section on line III-III of Fig. 2; Figs. 4, 5 and 5a are sectional side views of syringes embodying a fourth aspect of the invention; and Fig. 6 is an enlarged fragmentary view of the nozzle of a syringe.

Fig. 7 is a side view, partly in section, of a syringe fitted with a needle guard which is a modification of the embodiment of Fig. 1; Fig. 8 shows the syringe and guard of Fig. 7 with the guard retracted to expose the needle; Fig. 9 is an end view of a guard adapted for use with a syringe having an off-centre needle; and Figs. 10 and lOa are sectional end views of a syringe and an alternative embodiment of the needle guard.

Referring now to the drawings, Fig. 1 shows a syringe 10 comprising a barrel 12 having laterally extending finger portions 14 at the rearward, open end thereof and an outlet nozzle (not shown) at its forward, closed end, over which is mounted a collar 16 with a hypodermic needle 18 located therein. A plunger 20 is slidable within the barrel 12 and sealingly engages the interior side walls 22 thereof. The plunger 20 is operated by an actuating member 22 which extends rearwardly therefrom and is provided with a thumb piece 24.

In accordance with a first aspect of the present invention the syringe 10 is provided with a shroud in the form of a generally tubular sleeve 26 which surrounds the barrel 12 and is slidable along the exterior thereof between a first postion (shown in broken lines) and a second, extended position wherein the sleeve 26 extends beyond the forward end of the barrel 12 to shield the needle 18. The syringe may be used normally with the sleeve 26 in its first position. After use, the sleeve 26 may be moved forward into its second position to protect the needle until the syringe 10 may be disposed of safely. Co-operating projections 28 and indentations 30 may be provided on the exterior of the barrel 12 and the interior of the sleeve 26 to releasably retain the sleeve 26 in either its first or second postion.

Figs. 2 and 3 illustrate a second aspect of the invention. A syringe 32 again comprises a barrel 34, with a nozzle 36 at its forward end adapted to receive a hypodermic needle (not shown) as before, a plunger 38 and actuating member 40. As is best seen in Fig. 3, the barrel 34 and plunger 38 are oval in section and are therefore non-rotatable with respect to one another, unlike conventional syringes of circular cross-section.

After the syringe 32 has been used the actuating member 40 may be broken off simply by twisting it, thereby rendering the syringe 32 unusable. The actuating member 40 is preferably weakened at a point 42 adjacent the plunger 38 so as to be relatively weak in torsion at that point.

Obviously, the barrel 34 and the plunger 38 need notbe oval. Any non-circular section will prevent relative rotation of the plunger 38 and barrel 34, as would the provision of co-operating projections and grooves on the plunger and barrel of a circular section syringe.

The syringe 32 of Figs. 2 and 3 is thus easily broken after use and prior to incineration, eliminating the risk of used syringes being stolen and re-used.

Figs. 4, 5 and 5a show further syringes intended to be usable once only and suitable for issue to drug users to reduce the risk of spreading infection by sharing syringes.

The syringes 44 shown in Fig. 4 is adapted to prevent withdrawal of the plunger 46 from the barrel 48 once it has been pushed fully home. For this purpose annular grooves 50 are provided around the circumference of the plunger 46 and corresponding annular projections 52 are provided around the interior of the barrel 48 at the inner end thereof. When the plunger 46 is pushed home the grooves 50 engage the projections 52 and prevent it from being withdrawn again. The actuating member 54 may also be made to be relatively strong in compression and relatively weak in tension (such as by provision of a ball and socket connection 56) so that it will break or come apart if an attempt is made to withdraw the plunger after use.

Since the plunger 46 cannot be pushed fully home prior to use, a space 58 must be left at the inner end of.

the barrel 48 before use. A removable cuff 60 may be provided between the thumb piece 62 and finger projections 64 to prevent the plunger being accidentally pushed home before the syringe 44 is used.

In the syringe 66 of Figs. 5 and 5a, the actuating member 68 is made in two parts 70, 72, so as to be of variable length such as by means of a piston and cylinder arrangement 74.

The parts 70, 72 of the actuating member 68 are preferably generally cylindrical and a relatively close fit inside the barrel 76, the outer end of the rearward part 70 forming a thumb piece 78. Thus, as is shown in Fig.

5a, when the plunger 80 is pushed fully home the thumb piece 78 is lost inside the barrel 76 and cannot be subsequently withdrawn.

Suitable retaining means, such as an annular projection 82 on the inside surface of the barrel 78 adjacent the open end thereof, may be provided to further ensure that the plunger 80 cannot be withdrawn again after use.

A removable cuff 84 is again provided to prevent accidental loss of the actuating member 68 within the barrel 76 prior to use.

The cuff 84 is preferably lockable (such as by means of a bayonet fitting or the like) to prevent accidental removal.

The syringes 32, 44 and 66 of Figs. 2, 4, 5 and 5a are all adapted to prevent re-use of the syringes themselves. They do not, however, prevent the risk of hypodermic needles being re-used, which are normally mounted in collars (as in Fig. 1) which are a simple pushfit over the nozzle of the syringe. Fig. 6 shows a nozzle 86 of a syringe barrel 88 and a collar 90 having a hypodermic needle 92 located therein adapted to prevent removal and re-use of the needle 92. For this purpose, an annular projection 94 is formed on the surface of the nozzle 86 and a corresponding annular groove 96 is formed on the interior surface of the collar 90 so that the collar 90 may simply be pushed onto the nozzle 86 but may not be removed thereafter.

In addition, the nozzle 86 may be weakened at a point 98 behind the projection 94 so that it will break if an attempt is made to remove the collar 90.

The invention thus provides a number of simple modifications to conventional syringes which serve to eliminate or substantially reduce the risk of infection from used syringes.

A number of obvious variations of the illustrated embodiments will be apparent to those skilled in the art.

In particular, the various retaining means for the shroud of Fig. 1, the plungers and actuating member of Figs. 4, 5 and 5a and the collar nozzle of Fig. 6 may be widely varied both in type and location.

Figs. 7 to 10(b) illustrate modifications of the embodiment of Fig. 1. Figs. 7 and 8 show a syringe 100 comprising a barrel 102 and plunger 104 and having a hypodermic needle 106 mounted in a collar 108 fitted to the forward end thereof. The syringe 100 is provided with a needle guard comprising a generally tubular shroud 110, slidable along the barrel 102 between a first position (Fig. 8) wherein the needle 106 is exposed and a second position (Fig. 7) wherein the shroud 110 shields the needle 106. The shroud 110 is biased towards its second position by -bias means such as a coil spring 112 located between an inwardly extending annular flange 114, formed at the forward end of the shroud 110, and the forward end of the syringe barrel 100.

The shroud 110 is preferably lockable in its second position before and after use, requiring positive action by the user to unlock it. In the example illustrated, locking means for this purpose comprises a generally Lshaped groove 118 formed in the side of the barrel 100, having a first axially extending limb 120, a circumferentially extending limb 122 at the forward end thereof and a short second axially extending portion 123 extending forwardly from the end of limb 122 remote from the limb 120, and a cooperating projection 124 formed on the interior surface of the shroud 110. In Fig. 7 the shroud 110 is locked in its second position and may be unlocked by pushing it back and rotating it about the barrel 100 in the direction of the arrow A, whereafter it may be slid rearwardly against the force of the spring 112 in the direction of arrow B into the first position of Fig. 8.

It can be seen that the locking means also serves to limit the forward movement of the shroud 110. It is desirable that the shroud 110 returns automatically to its locked condition after use, and this may be achieved by having one end of the spring 112 engaging the shroud 110 and the other end engaging the barrel 100 such that rotation of the shroud in the direction A is against the torsional force of the spring 112. The combined axial and torsional forces of the spring 112 would then automatically return the shroud 110 to its locked position when released from the first position of Fig. 7.

Alternative locking means may be used in place of the illustrated arrangement. for example, the locking means might be adapted to be released automatically in response to pressure applied to the front of the shroud 110 and to re-engage automatically under the return force of the spring 112, however, it is particularly envisaged that the shroud 110 , in use, will be pushed back into its first position automatically when an injection or the like is being administered so that the spring 112 should be relatively weak to minimise any discomfort caused to the patient. It is also preferable that deliberate action is required to unlock the shroud 110.

One arrangement of this type is shown in Figs. 10 and 10(a). The shroud 138 is made from deformable resilient material (such as plastics material) and is slightly oval in section, its smallest internal diameter corresponding to the outer diameter of the syringe barrel 140. The shroud 138 is provided with an internal annular groove 142 which cooperates with a projection 144 on the barrel 140. When relaxed, as shown in Fig. 4 (a), the projection 144 engages the groove 142, locking the shroud 138 in position. The shroud 138 may be released by squeezing it so that it deforms to a substantially circular shape (Fig. 10 (b)), such that the groove 142 is disengaged from the protection 144 allowing the shroud 138 to be slid along the barrel 140. When released, the spring (not shown) will return the shrou-d 138 to its lock ed position.

Fig. 9 shows a modification of the guard of Fig. 7 for use with a syringe 126 (shown in broken lines) having a needle 128 located off-centre on the end thereof. In this case the forward end of the shroud 130 is closed and has an aperture 132 formed adjacent the periphery thereof.

Rotation of the shroud 130 in the direction of arrow C unlocks the shroud 130 (locking means again comprising a projection 134 on the interior of the shroud 130, and circumferential (136) and axial (not shown) grooves on the barrel of the syringe 126 and at the same time brings the aperture 132 into alignment with the needle 128.

It may also be preferable for the various types of shrouds herein described to be adapted to be removable to facilitate "loading" of the syringe (the sterile, unused needle not being dangerous), whereafter they may be fitted so as to protect the needle after use.

Claims (30)

Claims
1. A syringe comprising a barrel, plunger means slidable within said barrel and a hypodermic needle projecting from one end of said barrel, said syringe being provided with a generally tubular shroud slidable along the long axis of said barrel between a first position wherein said shroud surrounds said barrel and a second position wherein said shroud projects beyond said one end of said barrel to shield said needle.
2. A syringe as claimed in claim 1 wherein said shroud and said barrel are provided with co-operating projections and indentations whereby said shroud may be releasably retained in either of said first and second positions.
3. A syringe as claimed in claim 1 wherein said shroud is biased towards said second position by bias means.
4. A syringe as claimed in claim 3 wherein said bias means comprises a coil spring located inside the shroud between the front end thereof and the front end of the barrel of the syringe.
5. A syringe as claimed in claim 3 or claim 4 wherein locking means are provided for locking said shroud in said second position.
6. A syringe as claimed in claim 5 wherein said locking means comprises a projection and a co-operating, generally L-shaped groove, one of said projection and said groove being formed on the inner surface of said shroud and the other being formed on the outer surface of said barrel.
7. a syringe as claimed in claim 5 wherein said shroud is formed from a deformable resilient material and is oval in section, said barrel being provided with a projection on its outer surface and said shroud being provided with a co-operating annular groove on its inner surface, said projection and said groove being so positioned that they engage one another when said shroud is in its second position so as to prevent said shroud being slid along said -barrel, said shroud being releasable from said second position by deforming said shroud towards a generally circular section.
8. A syringe as claimed in claim 5 or claim 6 wherein said needle is located off-centre on the front end of said barrel wherein said shroud is rotatable about said barrel between a locked and an unlocked position, and wherein the front end of said shroud is closed and is provided with an aperture also located off-centre thereof, the aperture and needle being so disposed that said aperture is aligned with said needle when said shroud is in its unlocked position.
9. A syringe including a barrel, plunger means slidable within said barrel, and an actuating member extending rearwardly from said plunger means, wherein said barrel and said plunger means are adapted to be non-rotatable with respect to one another so that the actuating member may be broken after use by twisting.
10. A syringe as claimed in claim 9 wherein said barrel and said plunger means are of complementary, non-circular section.
11. A syringe as claimed in claim 10 wherein said barrel and said plunger means are oval in section.
12. A syringe as claimed in any of claims 9, 10 or 11 wherein said actuating member is weakened at a point adjacent said plunger means so as to be relatively weak in torsion.
13. A syringe comprising a barrel, plunger means slidable within said barrel and an actuating member extending rearwardly from said plunger means and adapted to prevent withdrawal of said plunger means once it has been pushed home.
14. A syringe as claimed in claim 13 wherein means are provided to retain said plunger means in said barrel once it has been pushed home.
15. A syringe as claimed in claim 14 wherein said plunger means and the innermost end of said barrel are provided with co-operating annular grooves and projections which engage one another when said plunger means is pushed home so as to prevent its subsequent withdrawal.
16. A syringe as claimed in claim 14 or claim 15 wherein said actuating member is adapted to be relatively strong in compression and relatively weak in tension such that it breaks or comes apart if an attempt is made to withdraw it after the plunger means has been pushed home.
17. A syringe as claimed in claim 16 wherein said actuating member is divided into two pieces attached to one another by means of a ball and socket connection such that the two pieces will separate if an attempt is made to withdraw the actuating member after the plunger means has been pushed home.
18. A syringe as claimed in claim 13 wherein said actuating member is of variable length such that the rearward end thereof is lost within said barrel once the plunger means has been pushed home.
19. A syringe as claimed in claim 18 wherein said actuating member is formed in two parts operably connected together and adapted to be of variable length by means of a piston and cylinder arrangement.
20. A syringe including a barrel having a nozzle extending from the end thereof to receive a hypodermic needle located in a collar, said collar being adapted to fit over said nozzle, and said collar being provided with cooperating retaining means to prevent subsequent removal of said needle once it has been fitted onto said syringe.
21. A syringe as claimed in claim 20 wherein said retaining means comprises co-operating projections and indenta-tions formed on the exterior of said nozzle and the interior of said collar.
22. A syringe as claimed in claim 20 or claim 21 wherein said nozzle is weakened such that it will break, leaving the nozzle retained within the collar, if an attempt is made to remove the collar therefrom.
23. A syringe substantially as hereinbefore described with reference to Fig. 1 of the drawings.
24. A syringe substantially as hereinbefore described with reference to Figs. 2 and 3 of the drawings.
25. A syringe substantially as hereinbefore described with reference to Fig. 4 of the drawings.
26. A syringe substantially as hereinbefore described with reference to Figs. 5 and 5(a) of the drawings.
27. A syringe substantially as hereinbefore described with reference to Fig. 6 of the drawings.
28. A syringe substantially as hereinbefore described with reference to Figs. 7 and 8 of the drawings.
29. A syringe substantially as hereinbefore described with reference to Fig. 9 of the drawings.
30. A syringe substantially as hereinbefore described with reference to Figs. 10 and 10(a) of the drawings.
GB08800929A 1987-01-17 1988-01-15 Syringes Withdrawn GB2202747A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB878700976A GB8700976D0 (en) 1987-01-17 1987-01-17 Syringes
GB878718275A GB8718275D0 (en) 1987-08-01 1987-08-01 Syringes

Publications (2)

Publication Number Publication Date
GB8800929D0 GB8800929D0 (en) 1988-02-17
GB2202747A true GB2202747A (en) 1988-10-05

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GB (1) GB2202747A (en)

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FR2625439A1 (en) * 1987-12-30 1989-07-07 Verlier Jacques
US4917673A (en) * 1988-10-31 1990-04-17 Coplin Allan J Assembly for the protection against inadvertent puncture by medical needles
WO1990003818A1 (en) * 1988-10-14 1990-04-19 Agven Medical Corporation Syringe
US4921486A (en) * 1989-06-23 1990-05-01 Dechellis Francis M Disposable syringe with retracting needle
WO1990006142A1 (en) * 1988-12-06 1990-06-14 Thomas Stern Hypodermic syringe
GB2232602A (en) * 1989-06-14 1990-12-19 Dinesh L Vadher Retractable needle
EP0413872A1 (en) * 1989-08-23 1991-02-27 Jack Boisson-Müller Protective sleeve for use with needles and syringes
GB2237201A (en) * 1989-09-28 1991-05-01 Ricardo Adrian Brizuela Protecting device for guide tubes used with blood and serum bags and the like
US5015234A (en) * 1989-06-02 1991-05-14 Jullien Robert G Syringe guard apparatus
GB2263871A (en) * 1992-01-30 1993-08-11 Malcolm Melville Davies Hypodermic syringe with eccentrically positioned retractable nozzle
WO1993017735A1 (en) * 1992-03-10 1993-09-16 Injectimed, Inc. Unitary injection apparatus incorporating retractable sleeve needle protection apparatus
FR2689765A1 (en) * 1992-04-10 1993-10-15 Vounatsos Constantin Syringe united injection.
US5269765A (en) * 1992-03-10 1993-12-14 Injectimed, Inc. Methods of manufacture of safety sleeves for medical injection devices
US5269766A (en) * 1992-06-09 1993-12-14 Habley Medical Technology Corporation Dental syringe having an automatically retractable medication carpule and needle cannula
EP0573947A1 (en) * 1992-06-12 1993-12-15 Becton Dickinson and Company A medical device with a lockable needle shield
GB2270471A (en) * 1992-09-11 1994-03-16 Chuang Hsian Tzuo Syringe with protective needle cap
EP0605422A1 (en) * 1991-09-23 1994-07-13 Sanofi Pharmaceuticals, Inc. Safety syringe assembly with radially deformable body
US5336200A (en) * 1992-03-10 1994-08-09 Injectimed, Inc. Retractable sleeve-protection for injection apparatus employing carpules
US5385557A (en) * 1994-04-04 1995-01-31 Thompson; Clarence J. Shielding device for a syringe needle
GB2283425A (en) * 1993-10-19 1995-05-10 Yong Siang Toi Protective sheath for a syringe
WO1995022369A1 (en) * 1994-02-17 1995-08-24 Clinical Product Development Limited Couplings for medical cannulae
EP0677298A1 (en) * 1994-04-13 1995-10-18 Lucette Renée Pince My Disposable device for parenteral injections
WO1997002855A1 (en) * 1995-07-12 1997-01-30 Societe D'etudes Et D'applications Techniques - Sedat Self-protected injection syringe
US5683370A (en) 1996-06-06 1997-11-04 Luther Medical Products, Inc. Hard tip over-the-needle catheter and method of manufacturing the same
EP0813881A2 (en) * 1996-06-21 1997-12-29 Becton Dickinson and Company Method of activating a needle assembly having a telescoping shield
WO1998011927A1 (en) * 1996-09-20 1998-03-26 Disetronic Licensing Ag Expulsion member for advancing the stopper of a syringe ampoule and a corresponding stopper
WO2000054831A1 (en) * 1999-03-17 2000-09-21 Designodev Ltd A safety assembly for a hypodermic applicator set
EP1051988A2 (en) * 1999-05-04 2000-11-15 Saf-T-Med Inc. Threaded latching mechanism
WO2002045780A2 (en) * 2000-12-04 2002-06-13 Bracco Diagnostics Inc. Syringe barrel and plunger assembly having ellipsoidal configurations
WO2002074369A1 (en) * 2001-03-20 2002-09-26 Disetronic Licensing Ag Needle protective covering
US6508807B1 (en) 1998-01-21 2003-01-21 Joseph L Peters Coupling for medical cannulae
WO2003037411A1 (en) * 2001-10-31 2003-05-08 Destroject Gmbh Single-use syringe for medical use
US6726652B2 (en) 2001-01-12 2004-04-27 Bracco Diagnostics, Inc. Tamper evident syringe barrel
WO2004084979A1 (en) * 2003-03-25 2004-10-07 Robert Baird Watson Hypodermic syringe
US6984223B2 (en) 2001-11-13 2006-01-10 Becton, Dickinson And Company Needle safety device
AU2004224822B2 (en) * 2003-03-25 2006-01-19 Robert Baird Watson Hypodermic syringe
GB2416698A (en) * 2004-08-04 2006-02-08 Tyrone Michael Meadows Single use syringe with needle cover
US6997913B2 (en) 2002-06-07 2006-02-14 Becton, Dickinson And Company Needle safety device
US7220247B2 (en) 2000-02-18 2007-05-22 Astrazeneca Ab Automatically operable safety shield system for syringes
WO2011144604A1 (en) * 2010-05-18 2011-11-24 Sanofi-Aventis Deutschland Gmbh Needle assembly for drug delivery devices
US8231583B2 (en) 2002-12-04 2012-07-31 Becton, Dickinson And Company Safety needle assembly with passive pivoting shield
US8287491B2 (en) 2008-11-26 2012-10-16 Becton, Dickinson And Company Single-use auto-disable syringe
US9861784B2 (en) 2013-12-03 2018-01-09 Becton, Dickinson And Company Blood collection device with double pivot shields
US9956344B2 (en) 2009-07-31 2018-05-01 The Medical House Limited Autoinjector

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GB858913A (en) * 1958-03-06 1961-01-18 Vivian Moreton An assemblage for use with a hypodermic syringe
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WO1989006146A1 (en) * 1987-12-30 1989-07-13 Jacques Verlier Non-reusable syringe
FR2625439A1 (en) * 1987-12-30 1989-07-07 Verlier Jacques
BE1003457A4 (en) * 1987-12-30 1992-03-31 Jacques Verlier non-reusable syringe.
WO1990003818A1 (en) * 1988-10-14 1990-04-19 Agven Medical Corporation Syringe
US4917673A (en) * 1988-10-31 1990-04-17 Coplin Allan J Assembly for the protection against inadvertent puncture by medical needles
EP0397845A4 (en) * 1988-12-06 1991-06-19 Thomas Stern Hypodermic syringe
WO1990006142A1 (en) * 1988-12-06 1990-06-14 Thomas Stern Hypodermic syringe
EP0397845A1 (en) * 1988-12-06 1990-11-22 STERN, Lawrence Hypodermic syringe
US5015234A (en) * 1989-06-02 1991-05-14 Jullien Robert G Syringe guard apparatus
GB2232602A (en) * 1989-06-14 1990-12-19 Dinesh L Vadher Retractable needle
US4921486A (en) * 1989-06-23 1990-05-01 Dechellis Francis M Disposable syringe with retracting needle
EP0413872A1 (en) * 1989-08-23 1991-02-27 Jack Boisson-Müller Protective sleeve for use with needles and syringes
GB2237201A (en) * 1989-09-28 1991-05-01 Ricardo Adrian Brizuela Protecting device for guide tubes used with blood and serum bags and the like
EP0605422A4 (en) * 1991-09-23 1995-04-19 Sterling Winthrop Inc Safety syringe assembly with radially deformable body.
EP0605422A1 (en) * 1991-09-23 1994-07-13 Sanofi Pharmaceuticals, Inc. Safety syringe assembly with radially deformable body
GB2263871A (en) * 1992-01-30 1993-08-11 Malcolm Melville Davies Hypodermic syringe with eccentrically positioned retractable nozzle
WO1993017735A1 (en) * 1992-03-10 1993-09-16 Injectimed, Inc. Unitary injection apparatus incorporating retractable sleeve needle protection apparatus
US5269765A (en) * 1992-03-10 1993-12-14 Injectimed, Inc. Methods of manufacture of safety sleeves for medical injection devices
US5336200A (en) * 1992-03-10 1994-08-09 Injectimed, Inc. Retractable sleeve-protection for injection apparatus employing carpules
WO1993020873A1 (en) * 1992-04-10 1993-10-28 Constantin Vounatsos Single-use syringe
US5531693A (en) * 1992-04-10 1996-07-02 Vounatsos; Constantin Single-use syringe
FR2689765A1 (en) * 1992-04-10 1993-10-15 Vounatsos Constantin Syringe united injection.
US5269766A (en) * 1992-06-09 1993-12-14 Habley Medical Technology Corporation Dental syringe having an automatically retractable medication carpule and needle cannula
EP0573947A1 (en) * 1992-06-12 1993-12-15 Becton Dickinson and Company A medical device with a lockable needle shield
GB2270471A (en) * 1992-09-11 1994-03-16 Chuang Hsian Tzuo Syringe with protective needle cap
GB2283425A (en) * 1993-10-19 1995-05-10 Yong Siang Toi Protective sheath for a syringe
WO1995022369A1 (en) * 1994-02-17 1995-08-24 Clinical Product Development Limited Couplings for medical cannulae
US5830195A (en) * 1994-02-17 1998-11-03 Clinical Product Development Limited Couplings for medical cannulae
US5385557A (en) * 1994-04-04 1995-01-31 Thompson; Clarence J. Shielding device for a syringe needle
EP0677298A1 (en) * 1994-04-13 1995-10-18 Lucette Renée Pince My Disposable device for parenteral injections
FR2718644A1 (en) * 1994-04-13 1995-10-20 Pince My Lucette Renee Retractable needle injection device.
US6110147A (en) * 1995-07-12 2000-08-29 Societe D'etudes D'applications Techniques-Sedat Self-protected injection syringe
US6569124B1 (en) 1995-07-12 2003-05-27 Societe D'etudes Et D'applications Techniques-Sedat Self-protected injection syringe
WO1997002855A1 (en) * 1995-07-12 1997-01-30 Societe D'etudes Et D'applications Techniques - Sedat Self-protected injection syringe
US5683370A (en) 1996-06-06 1997-11-04 Luther Medical Products, Inc. Hard tip over-the-needle catheter and method of manufacturing the same
US5913848A (en) 1996-06-06 1999-06-22 Luther Medical Products, Inc. Hard tip over-the-needle catheter and method of manufacturing the same
US5916208A (en) 1996-06-06 1999-06-29 Luther Medical Products, Inc. Hard tip over-the-needle catheter and method of manufacturing the same
EP0813881A2 (en) * 1996-06-21 1997-12-29 Becton Dickinson and Company Method of activating a needle assembly having a telescoping shield
EP0813881A3 (en) * 1996-06-21 1998-03-18 Becton Dickinson and Company Method of activating a needle assembly having a telescoping shield
WO1998011927A1 (en) * 1996-09-20 1998-03-26 Disetronic Licensing Ag Expulsion member for advancing the stopper of a syringe ampoule and a corresponding stopper
US6508807B1 (en) 1998-01-21 2003-01-21 Joseph L Peters Coupling for medical cannulae
WO2000054831A1 (en) * 1999-03-17 2000-09-21 Designodev Ltd A safety assembly for a hypodermic applicator set
EP1051988A2 (en) * 1999-05-04 2000-11-15 Saf-T-Med Inc. Threaded latching mechanism
EP1051988A3 (en) * 1999-05-04 2000-12-06 Saf-T-Med Inc. Threaded latching mechanism
US7220247B2 (en) 2000-02-18 2007-05-22 Astrazeneca Ab Automatically operable safety shield system for syringes
WO2002045780A3 (en) * 2000-12-04 2003-03-13 Bracco Diagnostics Inc Syringe barrel and plunger assembly having ellipsoidal configurations
WO2002045780A2 (en) * 2000-12-04 2002-06-13 Bracco Diagnostics Inc. Syringe barrel and plunger assembly having ellipsoidal configurations
US6749590B2 (en) 2000-12-04 2004-06-15 Bracco Diagnostics, Inc. Syringe barrel and plunger assembly having ellipsoidal configurations
US6942643B2 (en) 2001-01-12 2005-09-13 Bracco Diagnostics Inc. Tamper evident syringe barrel
US6726652B2 (en) 2001-01-12 2004-04-27 Bracco Diagnostics, Inc. Tamper evident syringe barrel
US6846303B2 (en) 2001-01-12 2005-01-25 Bracco Diagnostics Inc. Tamper evident syringe barrel
WO2002074369A1 (en) * 2001-03-20 2002-09-26 Disetronic Licensing Ag Needle protective covering
US7648486B2 (en) 2001-03-20 2010-01-19 Tecpharma Licensing Ag Cannula protecting cover
US7361166B2 (en) 2001-03-20 2008-04-22 Tecpharma Licensing Ag Cannula protecting cover
WO2003037411A1 (en) * 2001-10-31 2003-05-08 Destroject Gmbh Single-use syringe for medical use
USRE43473E1 (en) 2001-11-13 2012-06-12 Becton, Dickinson And Company Needle safety device
US6984223B2 (en) 2001-11-13 2006-01-10 Becton, Dickinson And Company Needle safety device
US6997913B2 (en) 2002-06-07 2006-02-14 Becton, Dickinson And Company Needle safety device
US8231583B2 (en) 2002-12-04 2012-07-31 Becton, Dickinson And Company Safety needle assembly with passive pivoting shield
AU2004224822B2 (en) * 2003-03-25 2006-01-19 Robert Baird Watson Hypodermic syringe
WO2004084979A1 (en) * 2003-03-25 2004-10-07 Robert Baird Watson Hypodermic syringe
GB2416698A (en) * 2004-08-04 2006-02-08 Tyrone Michael Meadows Single use syringe with needle cover
US8287491B2 (en) 2008-11-26 2012-10-16 Becton, Dickinson And Company Single-use auto-disable syringe
US9205205B2 (en) 2008-11-26 2015-12-08 Becton, Dickinson And Company Single-use auto-disable syringe
US9956344B2 (en) 2009-07-31 2018-05-01 The Medical House Limited Autoinjector
WO2011144604A1 (en) * 2010-05-18 2011-11-24 Sanofi-Aventis Deutschland Gmbh Needle assembly for drug delivery devices
US9861784B2 (en) 2013-12-03 2018-01-09 Becton, Dickinson And Company Blood collection device with double pivot shields

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