WO1995026764A1 - Apparatus for shielding a syringe needle - Google Patents

Apparatus for shielding a syringe needle Download PDF

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Publication number
WO1995026764A1
WO1995026764A1 PCT/US1995/003512 US9503512W WO9526764A1 WO 1995026764 A1 WO1995026764 A1 WO 1995026764A1 US 9503512 W US9503512 W US 9503512W WO 9526764 A1 WO9526764 A1 WO 9526764A1
Authority
WO
WIPO (PCT)
Prior art keywords
syringe
plunger
magnifying
needle
aperture
Prior art date
Application number
PCT/US1995/003512
Other languages
French (fr)
Inventor
Anthony J. Vallelunga
Paul V. Cacciotti
Vincent E. Cacciotti
Brian Crawford
Original Assignee
Unique Management Enterprises, Inc.
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 US08/220,867 priority Critical patent/US5352203A/en
Priority to US08/220,867 priority
Priority to US08/381,193 priority patent/US5498243A/en
Priority to US08/381,193 priority
Application filed by Unique Management Enterprises, Inc. filed Critical Unique Management Enterprises, Inc.
Publication of WO1995026764A1 publication Critical patent/WO1995026764A1/en

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
    • A61M5/50Devices 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
    • 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
    • A61M2005/3125Details specific display means, e.g. to indicate dose setting
    • 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
    • A61M2005/3125Details specific display means, e.g. to indicate dose setting
    • A61M2005/3126Specific display means related to dosing
    • 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
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/58Means for facilitating use, e.g. by people with impaired vision
    • A61M2205/583Means for facilitating use, e.g. by people with impaired vision by visual feedback
    • 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
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/58Means for facilitating use, e.g. by people with impaired vision
    • A61M2205/583Means for facilitating use, e.g. by people with impaired vision by visual feedback
    • A61M2205/585Means for facilitating use, e.g. by people with impaired vision by visual feedback having magnification means, e.g. magnifying glasses
    • 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
    • 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
    • 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

Abstract

An aspirating non-reusable syringe (10) is provided which includes a plunger (12). The main components of the plunger include a piston (14) and a cylindrical plunger stem (30). The piston is removably connected to the cylindrical plunger stem by a plurality of connecting members which utilize a nipple (26) mating with one aperture (20) and sliding within another aperture (27) to effect aspiration as well as disconnection of the piston from the plunger stem after a single use of the syringe. The present invention further provides a magnifying syringe shield including a hollow sleeve (120), a needle shielding means (134), and a snap ring (132). Radially extending projections (124), provided on the hollow sleeve, slide within longitudinally extending slots (136) in the needle shielding means, allowing extension and retraction of the needle shielding means. The snap ring is positioned within a groove (138) in the hollow sleeve at retraction, and extends into a groove in the needle shielding means at extension.

Description

APPARATUS FOR SHIELDING A SYRINGE NEEDLE

Field of the Invention

The present invention relates in general to a plunger for a non-reusable syringe, and more particularly to a non-reusable syringe which is incapable of being used more than once for making an injection and yet is capable of aspirating fluids. The non-reusable syringe utilizes a plunger that includes three connecting members which disconnect the plunger stem from the plunger piston after insertion of the plunger into the housing of the syringe in order to expel the contents of the syringe.

The present invention is also directed to an apparatus for shielding a syringe needle which can be locked in an extended position surrounding and shielding a syringe needle after use of the syringe. The apparatus includes a hollow sleeve and a needle shield, and utilizes a flexible snap ring within a groove of the needle shield as a locking means. The needle shield further includes a magnifying arrangement for enlarging the dosage indicia imprinted on the housing of an enclosed syringe.

Background of the Invention

In the United States and throughout the world, the multiple use of hypodermic syringe products which are intended for single use only is instrumental in drug abuse and more particularly in the transfer of contagious diseases . Such contagious diseases include AIDS and hepatitis. The transfer is most prevalent in intravenous drug users who routinely share and reuse syringes, but can also be a problem for the medical community if proper precautions to prevent multiple use of disposable syringes are not followed. Furthermore, the effects of multiple use are a major concern in third world countries where repeated use of syringe products may also be responsible for the spread of many diseases.

Many attempts have been made to remedy this problem. Some early attempted solutions involved destruction of the syringe after use either by using a destructive device or providing a syringe assembly with frangible zones so that the syringe could be rendered inoperable by the application of force. Although many of these devices work quite well, they require the specific intent of the user followed by the actual act to destroy or render the syringe inoperable. None of these devices is effective with a user having the specific intent to reuse the syringe.

Accordingly, there is a need for a non-reusable syringe which becomes inoperative or incapable of further use automatically without an additional act on the part of the user. Co-owned U.S. Pat. No. 5,215,524, issued Jun. 1, 1993, the contents of which are hereby incorporated by reference, discloses a single use syringe which utilizes a disconnecting plunger stem. This syringe becomes inoperative automatically after a single use. However, the need for a non-reusable syringe must be met without preventing the filling or use of the syringe under normal conditions. One such use under normal conditions includes the ability to aspirate fluid using the syringe. It is common in the medical community to aspirate fluid during the use of a syringe (i.e., to alternately retract and extend the plunger of the syringe without expelling all contents of the syringe) . This ability to aspirate must still be available with a single use syringe, and is not available with the syringe of U.S. Pat. No. 5,215,524.

Although various types of single use non-reusable syringes have been proposed, the severity of the AIDS epidemic and the need for solutions to the above problems continuously provide a need for other types of non-reusable syringes, particularly those which also provide for aspiration.

A wide variety of manually actuated techniques have also been utilized to prevent the multiple use of syringes. One approach involves the use of some sort of cap to cover the syringe needle after use, to prevent contact with the needle. This cap can be as simple as the original plastic cap which is used to cover the needle prior to use. However, the motion required to replace the original needle cap allows for error resulting in needle contact. This is due to the relatively small diameter of the cap and the required movement of a hand toward the contaminated needle during cap replacement.

Other approaches provide for additional means for covering the needle, in the form of shields. A highly effective example of a shield is disclosed in United States Patent No. 5,290,255 to Vallelunga et al . , entitled APPARATUS FOR SHIELDING A SYRINGE NEEDLE, issued March 1, 1994 and incorporated herein by reference.

The needle shield disclosed in the above-referenced U.S. Patent to Vallelunga et al . provides a means for preventing pricks and contact with contaminated needles, without interfering with the normal usage of a syringe. The needle shield is easily manufactured in conjunction with a syringe and/or may be easily assembled onto an existing syringe if manufactured separately. Other examples of needle shield systems are disclosed in United States Patent Nos. 4,666,435 (Braginetz, May 1987), 4,871,355 (Kikkawa, October 1989), 4,923,447 (Morgan, May 1990), 4,998,920 (Johnson, March 1991) , 5,024,616 (Ogle, II, June 1991), and 5,059,185 (Ryan, October 1991), each incorporated herein by reference.

Syringe shielding systems generally enclose the body of the syringe within a clear plastic sheath designed to be longitudinally displaced over the syringe needle after use, thereby preventing multiple uses of the needle. During normal usage of the syringe, the sheath encloses a substantial portion of the main body of the syringe, potentially reducing the readability of the underlying dosage indicia. As should be readily apparent, the inability to accurately view the dosage indicia on a syringe may pose serious health threats to a patient if an incorrect dosage of a medication is administered. This problem is especially relevant to those patients, such as diabetics, who are required to accurately self-administer injections.

Summary of the Present Invention

In order to prevent the multiple use of a syringe, the first aspect of the present invention provides a novel syringe which is incapable of being used more than once for making an injection and yet is capable of aspirating fluids. The non- reusable syringe utilizes a plunger that includes three connecting members which disconnect the plunger stem from the plunger piston after insertion of the plunger into the housing of the syringe in order to expel the contents of the syringe.

The main components of the plunger of the subject invention include a piston and a cylindrical plunger stem hollow at an open end thereof. The piston is removably connected to the cylindrical plunger stem by first, second, and third connecting members. The first connecting member is connected longitudinally to the piston and extends into the open end of the plunger stem. The first connecting member comprises a plurality of circumferentially spaced arms extending longitudinally away from the piston. The circumferentially spaced arms form a first aperture an interior thereof and are flared at an exterior thereof on an end opposite the connection to the piston. The second connecting member comprises a plurality of protrusions extending radially away from a second aperture. The third connecting member is a longitudinal nipple slidable within the second aperture and matable with the first aperture formed by the circumferentially spaced arms of the first connecting member. The cylindrical plunger stem has a plurality of circumferentially spaced slots extending longitudinally at an open end thereof, and the open end of the hollow cylindrical plunger stem encloses the first, second and third connecting members such that the plurality of protrusions of the second connecting member slide within the plurality of slots and are friction fit within the inner diameter of an outer housing. To accomplish the non-reusable feature of the syringe which includes the plunger of the subject invention, an open end of the plunger stem is constricted on an interior thereof such that the interior snugly mates with flared exterior of the circumferentially spaced arms when the nipple is inserted into the first aperture formed by the interior thereof.

When the piston which is located at the front end of the plunger is inserted into the rear end of a hollow cylindrical housing of a syringe unit, the wall and the piston form a sealed cavity (with the cylindrical housing side wall) for containing a liquid within the interior of the hollow cylindrical housing.

Prior to use, and preferably during manufacturing, the nipple is mated with the first aperture. When the nipple is mated with the first aperture, the second connecting member is positioned toward the front of the slots in the plunger stem.

This allows the entire plunger unit to be drawn back for filling of the syringe, because in this configuration, the interior constricted portion of the cylindrical plunger stem exerts pressure on the circumferentially spaced arms. However, the nipple counteracts such pressure and prevents flexion of the arms inward. Therefore, the piston, plunger stem, and first, second and third connecting members operate as a single unit. However, the nipple is forced from the first aperture as the protrusions on the second connecting member slide to the rear of the slots in the plunger stem. Any subsequent attempt to draw back the plunger to fill the syringe with fluid results in the interior constricted portion of the cylindrical plunger stem exerting pressure on the circumferentially spaced arms. Since the nipple no longer counteracts such pressure, the arms flex inward and the cylindrical plunger stem passes over the first connecting member. Thus, the plunger stem, second connecting member, and third connecting member are disconnected from the piston and the first connecting member. Accordingly, the syringe is incapable of being refiled because the piston must be withdrawn to create the vacuum for filling the syringe and to create the cavity for holding the liquid within the syringe.

The resulting non-reusable single use syringe can thus be used to prevent multiple use of syringes, such as disposable hypodermic syringes. This is accomplished by providing the piston/syringe as discussed in further detail below.

The syringe according to the subject invention is also capable of aspiration due to the use of the sliding third connecting member (the nipple) within the second aperture. The nipple can slide within the aperture a distance equal to the length of the slots before the second connecting member (the plurality of protrusions) contacts the end of the slots and thereby forces the nipple out of the first aperture. Thus, one is able to move the plunger back and forth within the limitations of the slot length without disengaging the plunger stem. This allows for aspiration using the syringe as is also discussed in further detail below.

In order to avoid the disadvantages of the prior art, the present invention further provides a needle shield and syringe assembly which is designed to prevent pricks and contact with contaminated needles, wherein the needle shield incorporates a magnifying arrangement for enlarging the dosage indicia imprinted on the syringe housing. The main components of the needle shield include a hollow sleeve, a needle shielding means, and a flexible snap ring. The hollow sleeve is mounted to a syringe housing. Any syringe can be adapted for use with the needle shield, including conventional medical syringes and syringes made for single use only (see, for example, United States Patent No. 5,215,524 to Vallelunga et al. , entitled "Plunger For Non-Reusable Syringe", the contents of which are hereby incorporated by reference) . The hollow sleeve has one or more radially extending projections and a groove into which the flexible snap ring can be inserted. The needle shielding means is movably positioned on the hollow sleeve surrounding the syringe housing. In an extended position, the needle shielding means surrounds and shields the needle, while in a retracted position the needle shielding means leaves the needle exposed for use. To accomplish the movement of the needle shielding means, it is equipped with one or more longitudinally extending slots. Each of the radially extending projections of the hollow sleeve is slidably disposed within a corresponding slot on the needle shielding means. When the snap ring is positioned within the groove on the hollow sleeve, the needle shielding means can be slid forward (toward and over the needle of the syringe) by pulling the syringe itself back toward the user as the projections of the hollow sleeve track along in the slots. At this time, the inner wall of the needle shielding means holds the snap ring securely in the groove of the hollow sleeve. When the needle shielding means is extended to fully cover the syringe needle, the groove on the inner wall of the needle shielding means is then positioned in line with the snap ring. The flexible snap ring extends outward into the groove in the needle shielding means, while remaining in part within the groove of the hollow sleeve. The tension forces of the snap ring trying to extend outwardly result in the secure and permanent positioning of the snap ring at this point. The snap ring therefore prevents further movement of the slidable needle shielding means, since the snap ring has locked into the grooves.

The syringe upon which the shield is utilized, whether it is a conventional medical syringe or a single use syringe, includes a hollow cylindrical syringe housing having an interior, and a hollow needle mounted to the housing. The needle is in fluid communication with the interior of the housing, and fluid can be drawn into the syringe housing or ejected therefrom by moving the plunger means which is positioned within the housing.

The hollow sleeve can be formed as an integral part of a syringe being manufactured, or can be attached to the housing of a syringe manufactured separately. Such attachment can be by any suitable permanent means, including glue or heat sealing. Preferably, the various parts of the syringe assembly, including the shield, are made of plastic to allow for manufacturing by injection molding. This allows for efficient and cost-effective production of the syringe and shield. Suitable plastics include clear lexan plastic, since a clear plastic allows the numbers on the syringe to be more easily read through the shield components.

The resulting needle shield and syringe assembly can thus reduce the risk of accidental pricks and contact with contaminated needles. The movement of the needle shielding means is accomplished by a motion which is not directed toward the tip of the contaminated needle, and can be accomplished smoothly and easily with little effort. Thus, the needle shield and syringe assembly is practical in both manufacturing and usage.

In an alternate embodiment of the present invention, the needle shielding means further includes an elongated magnifying arrangement, extending longitudinally along a side of the needle shielding means, for enlarging the dosage indicia imprinted on the underlying syringe housing. The elongated magnifying arrangement may extend completely or partially along the length of the needle shielding means, depending upon the position and/or characteristics of the dosage indicia on an associated syringe. In accordance with the present invention, the magnifying arrangement is formed from a clear plastic or another suitable, clear material. Preferably, the magnifying arrangement is of a convex shape, wherein the outwardly curved upper surface of the convex magnifying arrangement provides a magnifying effect. Essentially, the magnifying arrangement appears as a semi- cylindrical protuberance which extends longitudinally along side of the needle shielding means. Of course, flat or other non- convex magnifying arrangements may be incorporated into the needle shielding means without departing from the scope of the present invention.

The magnifying arrangement is preferably formed integrally with the needle shielding means from a clear plastic material in a molding process, although it may be formed separately therefrom and attached, either fixedly or removably, to the needle shielding means in any suitable manner. Advantageously, if a removable magnifying arrangement is utilized, the magnification provided by the present invention may be adjusted as necessary according to the needs of the user, the characteristics of the dosage indicia or other factors .

Brief Description of the Drawings

These and other objects, features and advantages of the present invention will be evident from the following detailed description of preferred embodiments when read in conjunction with the accompanying drawings in which:

FIG. 1 is a partially cut away isometric view of a plunger which is one embodiment of the subject invention;

FIG. 2 is a side view of a non-reusable syringe including the plunger shown in FIG. 1, shown prior to withdrawal of the plunger to fill the syringe;

FIG. 3 is a cross-sectional view of the non-reusable syringe shown in FIG. 2;

FIG. 4 is a partial isometric view of the rear end of the plunger shown in FIG. 1; FIG. 5 is a side view of the non-reusable syringe of FIG. 2 indicating the position of the syringe elements during insertion of the plunger into the hollow cylindrical housing;

FIG. 6 is a cross-sectional view of the non-reusable syringe shown in FIG. 5; FIGS. 7 and 8 are side views of the non-reusable syringe of FIG. 2 showing the aspiration feature of the syringe accomplished by sliding the nipple within the aperture without disconnecting the nipple from the aperture;

FIG. 9 is a partially cut-away isometric view of a syringe having a needle;

FIG. 10 is a front elevational view of one embodiment of a hollow sleeve according to the subject invention;

FIG. 11 is a right side elevational view of the hollow sleeve shown in FIG. 10;

FIG. 12 is an elevational view of another embodiment of a hollow sleeve according to the subject invention; FIG. 13 is an elevation view of one embodiment of a snap ring according to the subject invention;

FIG. 14 is a partially cut-away isometric view of one embodiment of a needle shielding means according to the subject invention; FIG. 15 is a partially cut-away isometric view of a syringe and shield assembly according to one embodiment of the subject invention, with the needle shielding means in a retracted position;

FIG. 16 is a partially cut-away isometric view of the syringe and shield assembly shown in FIG. 15 with the needle shielding means in an extended position;

FIG. 17 is a cross-sectional view of the syringe and shield assembly shown in FIG. 16, illustrating the position of the snap ring within the grooves; FIG. 18 is a partially cut-away isometric view of a syringe and shield assembly according to another embodiment of the subject invention, with the needle shielding means in a retracted position;

FIG. 19 is a partially cut-away isometric view of the syringe and shield assembly shown in FIG. 18 with the needle shielding means in an extended position;

FIG. 20 is a cross-sectional view of the syringe and shield assembly shown in FIG. 19, illustrating the position of the snap ring within the grooves;

FIG. 21 illustrates an alternate embodiment of a needle shielding means in accordance with the present invention, illustrating an elongated, convex magnifying arrangement for enlarging the dosage indicia imprinted on the housing of an enclosed syringe;

FIG. 22 is a cross-sectional view of the needle shielding means illustrated in FIG. 21;

FIG. 23 is a cross-sectional view of a needle shielding means incorporating a further embodiment of the indicia magnifying arrangement; and

FIG. 24 illustrates the indicia magnification provided by the magnifying arrangement of the present invention.

Detailed Description of the Invention

The main components of one preferred embodiment of the subject invention are depicted in FIGS. 1-8. As shown in FIGS. 1 and 4, the plunger 12 comprises a cylindrical plunger stem 30 closed at its rear end 38 and hollow at least at the other front end 34. At the front end 34 of the plunger stem 30 a piston 14 provides a liquid sealing means. The closed rear end 38 and the piston 14 form an interior 54 of the plunger 12. Toward the front end 34 of the plunger 12, slots 32 extend longitudinally around the circumference of the plunger stem. The plunger stem 30 is connected to the piston 14 by a first connecting member 16, a second connecting member (made up of aperture 27 and protrusions 28) , and a third connecting member 26. As shown in FIGS. 2 and 6, the first connecting member 16 is connected longitudinally to the piston 14, or may be integral therewith, and comprises a plurality of circumferentially spaced arms 18 extending longitudinally away from the piston 14. The arms 18 form a first aperture 20 at their interior, the purpose of which is discussed in further detail below. At the exterior end 22 of the arms away from the connection to the piston, the arms are flared. The first aperture 20 is mated with the third connecting member, a longitudinal nipple 26. The second connecting member includes a plurality of protrusions 28 which extend radially away from a second aperture 27 to form a friction fit within the inner diameter of an outer housing (see below) and also slidably fit within the slots 32 of the plunger stem 30. This is best shown in FIGS. 2 and 3. The nipple 26 slides within this second aperture 27. The interior surface at the front end of the plunger stem forms a constricted end 36, such that the front end 34 of the plunger stem 30 snugly fits against the arms 18 of the first connecting member 16. The flared end 22 of the first connecting member 16 mates with the constricted end 36 of the interior of the plunger stem 30 (see FIG. 2) . The plunger 12 is snugly inserted into a hollow cylindrical housing 40 of a syringe 10 (see FIGS. 2 and 5) . The hollow cylindrical housing 40 is closed at its front end 42 by a wall 44, to which a needle can be mounted via a mounting means 48. Syringe needles are generally marketed with a plastic-type bracket on one end thereof. This plastic-type bracket mounts to the mounting means 48. The bracket may snugly slide over the mounting means 48, or the mounting means could be provided with grooves into which corresponding ridges on the bracket are twisted. Various means for connecting the syringe needles are known in the art and can thus be used in the subject invention to mount a needle to the mounting means. A needle so mounted in the wall 44 is in fluid communication with the interior 46 (see FIG. 2) of the housing 40. In order to prevent tampering with the connecting members in an attempt to reuse the syringe, removal of the plunger 12 is prevented by one-way flanges 52 at the rear end 50 of the housing 40. These flexible flanges are angled so that insertion of the plunger is possible but removal is not possible due to the contact of the protrusions 28 of the second connecting member 24 with the flanges 52. When the flanges extend into the interior of the housing, the diameter of the second connecting member protrusions 28, which are friction fit within the housing 40, is such that the second connecting member cannot pass through the housing at the position of the flanges.

Having described one embodiment of the plunger and non- reusable syringe of the subject invention, its use is best illustrated in FIGS. 2 and 5, and 7 and 8. As shown in FIG. 2, the initial position of the elements of the syringe 10 prior to withdrawal (so as to fill the syringe) are illustrated. The plunger 12 is fully inserted into hollow cylindrical housing 40, so that the piston 14 is adjacent the wall 44 at the front end 42 of the housing 40. The nipple 26 is mated with the aperture 20 and the protrusions 28 are positioned slideably within and toward the front of the slots 32. A cross-section illustrating the position of the syringe elements taken through the second connecting member is shown in FIG. 3. In this position, the nipple 26 prevents withdrawal of the plunger stem 30 without simultaneous withdrawal of the piston 14. This is because withdrawal of the plunger stem 30 causes the constricted front end 36 of the plunger stem 30 to exert a rearward force on the flared ends 22 of the first connecting member's arms 18. The nipple 26 prevents the arms 18 from flexing inward in response to this force. Accordingly, the entire plunger 12 unit is pulled rearward in one motion, so as to fill the syringe.

Upon forward motion of the plunger stem 30 to an extent greater than the length of the slot 32, as shown in FIG. 5, the second connecting member including the plurality of protrusions 28 slides to the rear of the slots 32 and the nipple 26 is no longer mated with the aperture 20. FIG. 6 illustrates a cross- section of the syringe at the position of the flared ends of the arms at this point of an injection stroke. Any subsequent rearward movement of the plunger stem therefore results in another rearward force on the flared ends of the first connecting member's arms. The removal of the nipple allows the arms to flex inward, allowing the constricted end of the plunger stem to pass thereby. The plunger stem, second connecting member, and third connecting member are thus withdrawn, but the piston and first connecting member remain within the housing and no longer operate in conjunction with the plunger stem. As should be readily apparent, the syringe is then incapable of being used again because the movement of the piston is necessary to create the vacuum for filling of the syringe. FIGS. 7 and 8 illustrate the aspiration feature of the subject invention. The syringe (beginning as shown in FIG. 2) plunger stem 30 is withdrawn in the hollow cylindrical housing 40 to the point shown in FIG. 7. The plunger stem 30 is then pushed back into the hollow cylindrical housing 40 to the position shown in FIG. 8. At this point, the nipple 26 remains mated within the first aperture 20 of the first connecting member 16, by sliding within the second aperture 27 of the second connecting member. The plunger stem 30 can be alternately withdrawn and pushed into the hollow cylindrical housing 40 in this fashion for aspiration until the plurality of protrusions 28 of the second connecting member contact the rear of the slots 32. At that time, the second connecting member will pull the nipple 26 out of the first aperture 20 of the first connecting member 16 and render the syringe incapable of further use, as shown in FIG. 5.

Thus, the amount of aspiration possible can be controlled by controlling the length of the slots and the length of the longitudinal nipple. By extending the slot and providing a nipple which can slide within the second connecting member, this aspiration feature is attainable.

It should be readily apparent to those skilled in the art that any suitable materials, such as plastic and rubber, can be utilized for the various syringe elements. The syringe which includes the plunger as described above is assembled as follows. The piston 14 and the first connecting member 16 are positioned at the front end 42 of the hollow cylindrical housing 40. The third connecting member 26 is positioned in the aperture 27 of the second connecting member, and both members co connected are then positioned within the cylindrical plunger stem 30 so that the protrusions 28 of the second connecting member extend through the slots 32 of the cylindrical plunger stem 30. At this point, the rear end 38 of the plunger stem 30 is not closed or sealed, but remains hollow (see broken lines on FIG. 4) . The hollow cylindrical plunger stem 30, with the second and third connecting members positioned within the plunger stem, is snugly inserted into the hollow cylindrical housing 40 until the third connecting member 26 contacts the first connecting member 16 at the front of the hollow cylindrical housing 40. A rigid device, such as a wire or even a pencil-like member, is inserted into the hollow center 54 of the plunger stem 30 to exert a forward force on the third connecting member 26. This causes the nipple 26 (of the third connecting member) to mate with the first aperture 20 of the first connecting member 16. The rigid device is then removed from the center of the plunger stem, and the rear end 38 of the plunger stem is sealed or closed by suitable means. For example, a plastic plug may be inserted or injected, or a cap can be permanently applied to the end of the plunger stem. The end is permanently sealed so that future tampering with the second and third connecting members is not possible. This prevents the syringe from being "re-set", i.e., by forcing the third connecting member nipple forward to mate with the first aperture. After the end of the plunger stem is sealed, the syringe is ready for use. Accordingly, after any required aspiration and a single dispensing use, the syringe of the subject invention cannot be used again because the plunger stem separates from the piston. This prevents subsequent filling with liquid .

The subject invention this provides a method of preventing multiple use of a syringe comprising the steps of: selecting the single use syringe of the subject invention as disclosed above; drawing a liquid into the single use syringe; and dispensing the liquid from the single use syringe. When the liquid has been dispensed from the single use syringe, the syringe cannot again be used to draw a liquid into the syringe due to the separation of the piston from the plunger stem upon any subsequent withdrawal of the plunger body. The invention also provides a method of aspirating using a single use syringe by alternately pushing and drawing the plunger without unmating the nipple of the syringe.

The present invention also provides an apparatus for shielding a syringe needle which can be locked in an extended position surrounding an shielding a syringe needle after use of the syringe.

A typical syringe upon which a shield of the subject invention can be used is shown in FIG 9. The syringe 110 has a hollow cylindrical housing 112 to which a hollow needle 116 is mounted. The hollow needle 116 is in fluid communication with the interior 114 of the housing 112. Movement of a plunger 118 positioned within the housing 112 allows the drawing of fluid into the syringe and the ejecting of fluid from the syringe. Syringe needles are generally marketed with a plastic-type bracket 117 on one end thereof. This plastic-type bracket mounts on the restricted end 119 of the syringe unit. The bracket may snugly slide over the restricted end, or the restricted end could be provided with grooves into which corresponding ridges on the bracket are twisted. Various means for connecting syringe needles are known in the art and can thus be used in the subject invention to mount a needle to a syringe housing. The main components of the shield according to the subject invention are depicted in FIGS. 10-14. The shield includes a hollow sleeve 120 as shown in FIGS. 10 and 11. The hollow sleeve 120 is mounted to the housing of a syringe (see FIGS. 15- 17) . The sleeve 120 has two radially extending projections 124 and a groove 122 at one end, into which a flexible snap ring 132 (see FIG. 13) can be inserted. In an alternate embodiment of the hollow sleeve shown in FIG. 12, the groove 128 is not located at an end of the hollow sleeve 126 and only one radially extending projection 130 is utilized. The mounting of this embodiment of the hollow sleeve 126 to the housing of a syringe is shown in FIGS. 18-20. Generally, a single projection (and corresponding slot as discussed below) is most suitable on small syringes such as insulin syringes. The double projection is most suitable for larger, i.e., 3 cc or greater, syringes. It should be readily apparent, however, that one or more projections and corresponding slots can be utilized on any size syringe despite these preferences.

The shield assembly also includes a flexible snap ring 132 as shown in FIG. 13. Preferably, the snap ring is C-shaped and square or rectangular in cross-section so that the snap ring cannot be easily slid out of a groove into which it is inserted. The size of the snap ring is such that tensional forces hold it within the groove of the hollow sleeve and the interior wall of the needle shielding means (see below) . As a result, when the snap ring becomes aligned with the groove in the interior wall of the needle shielding means, it extends outward (at the tips of the "C") .

A needle shielding means is also included in the shield, as shown in FIG. 14. The needle shielding means 134 is tubular and preferably closed on one end, except for a hole which allows insertion of a needle. The closed end helps to contain any blood which may drip from the needle or syringe assembly after use. The hole or aperture for insertion of a needle is small and does not permit insertion of hands or fingers, which helps prevent needle sticks or contact. The closed end may be preformed or the end may be a cap-type that is snapped onto the end. In a further embodiment, the end of the needle shielding means may be open. The needle shielding means has one or more longitudinally extending slots 136 on the interior wall thereof and an interior groove 138 at one end of the slots. The groove 138 allows extension of the snap ring when the needle shielding means is extended, locking into place and preventing further movement of the needle shielding means. Each of the radially extending projections of the hollow sleeve are slidably disposed within a corresponding slot, so that the needle shielding means can slide to an extended position to surround and shield the needle or to a retracted position surrounding the syringe housing and leaving the needle exposed for use. By placing the slot and groove on the interior of the needle shielding means, they cannot be tampered with. However, the shield will function if the slots and groove extend through the exterior surface of the needle shielding means, and this is also encompassed by the subject invention. The needle shielding means also has an aperture through the side thereof the size of the cross-section of the snap ring, positioned over the location of the hollow sleeve's groove when the needle shielding means is fully retracted. This aperture allows assembly of the shield components when a closed end needle shielding means is utilized. The hole is not necessary for assembly when the end of the needle shielding means is open, as discussed below.

A temporary locking means for releasibly locking the needle shielding means in its retracted position can also be included. This prevents premature extension of the needle shielding means which would result in locking of the shield into place over the needle, preventing use. As shown in FIG. 14, the temporary locking means preferably comprises one or more notches 140 formed in the interior of the needle shielding means extending off the ends of the slots . These notches are disposed substantially transversely relative to the slots, and are sized to receive the projections of the hollow sleeve. Rotation of the needle shielding means so that the projections are positioned within the notches prevents extension of the needle shielding means .

The needle shielding means can also be provided with a ring or lip 141 at its base (the end nearest the syringe needle) to help prevent slippage of a user' s hand over the end of the shielding means to the needle. Slippage is also prevented by the finger grips 137 which allow a firm grasp on the needle shielding means during movement thereof .

The use of the needle shield, including the hollow sleeve, the needle shielding means, and the snap ring, is shown in FIGS. 15-20. The syringe is as shown in FIG. 9.

Referring to FIG. 15, the hollow sleeve 120 (see FIGS. 10 and 11) is mounted to the front restricted end 119 of the syringe housing 112. The needle shielding means 134 (see FIG. 14) is shown in the retracted position, with the snap ring 132 positioned in the groove 122 of the hollow sleeve 120. The projections 124 of the hollow sleeve 120 are temporarily locked in the notches 140 of the needle shielding means 134 extending off the ends of the slots 136. Referring to FIG. 16, the needle shielding means 134 has been rotated and moved forward, allowing the projections 124 to be guided along in the corresponding slots 136. The extension of the needle shielding means 134 over the needle 116 has positioned the snap ring 132 in line with the interior groove 138 of the needle shielding means 134. As shown in FIG. 17, the snap ring 132 has extended to occupy both the groove 122 of the hollow sleeve and the groove 138 of the needle shielding means. This permanently locks the position of the needle shielding means. Referring to FIG. 18, an alternate embodiment utilizing the single projection hollow sleeve 126 of FIG. 12 is shown. The hollow sleeve 126 is also positioned on the housing 112, but not on the restricted end. The needle shielding means 134 is shown in the retracted position, and in the extended position in FIG. 19. As shown in FIG. 20, the snap ring 132 extends to within the groove 138 of the needle shielding means from the groove 128 of the hollow sleeve. Since the hollow sleeve 126 is mounted on the housing 112, the housing 112 can be seen in this cross- sectional view. Having thus described the components of the subject invention, it can be assembled as follows. In one embodiment, the hollow sleeve is mounted to the restricted end of the syringe housing. The hollow sleeve/housing is then inserted into the open end of the needle shielding means (one end of the needle shielding means is closed except for a small aperture for insertion of a needle) . The diameter of the needle shielding means fits snugly about the syringe housing, but leaves enough room for passage of the projections. The projections are passed along the top part of the needle shielding means until they are disposed within their corresponding slots . To provide an even snugger fit of the needle shielding means and the syringe housing, the slots on the interior of the needle shielding means can be extended to the end of the needle shielding means to allow for insertion of the projections during assembly. The syringe can then be slid along the needle shielding means, using the projections within the slots as a guide. When the projections reach the end of the slots, the groove of the hollow sleeve is positioned beneath the hole or aperture in the needle shielding means. The snap ring is then inserted through the hole and into the hollow sleeve's groove. The syringe and shield assembly is then ready for use, once a needle is attached to the syringe. Any full extension of the needle shielding means will result in locking of the snap ring into the groove of the needle shielding means. The needle shielding means will thus be locked in a position which covers and shields the needle of the syringe.

Alternatively, a needle shielding means which is -open on both ends, at least for assembly, can be utilized. In this embodiment, the syringe is inserted into the needle shielding means from the end. The needle shielding means is somewhat shorter than the syringe, and is positioned so that the restricted end of the syringe housing is exposed. The hollow sleeve is then attached to the syringe housing by suitable means (see above) . After the hollow sleeve is attached, the snap ring is inserted into the groove of the hollow sleeve as the hollow sleeve is pulled within the needle shielding means. In this embodiment, an aperture for insertion of the snap ring is not necessary. However, one could also be utilized if the hollow sleeve is first slid into the needle shielding means before the snap ring is positioned. The syringe and shield assembly is then ready for use, once a needle is attached to the syringe. If desired, a cap can then be secured over the open end of the needle shielding device. As in the previous embodiment, a small hole or aperture in the cap would allow mounting of a needle to the syringe for use.

Referring now specifically to FIGS. 21 and 24, there is illustrated a needle shielding means 150 incorporating an elongated, convex magnifying arrangement 152 for enlarging the dosage indicia 154 imprinted on the housing of an enclosed syringe. With the exception of the magnifying arrangement 152, the needle shielding means 150 is generally constructed as detailed above, including at least one longitudinally extending slot 136 and associated notch 140, and finger grips 137.

As illustrated in FIG. 24, the magnifying arrangement 152 preferably provides a magnification of between l.8x-2.2x. Of course, if required (or desired) , less or more magnification may be utilized to enlarge the dosage indicia 154 to a more easily readable size. Preferably, the magnifying arrangement 152 extends longitudinally along substantially the entire length of the needle shielding means 150, thereby magnifying an elongated section of an underlying syringe when the needle shielding means 150 is in a retracted position. Again, the length of the magnifying arrangement 152 may be altered as necessary in accordance with the characteristics of the dosage indicia, the orientation of the dosage indicia on the body of a syringe and other relevant factors. When the needle shielding means 150 is in an extended position in a manner similar to the needle shielding means 34 illustrated in FIG. 16, the magnifying arrangement 152 is no longer positioned over the dosage indicia 154. As should be readily apparent, in such an extended position, the dosage indicia 154 is no longer enlarged by the magnifying arrangement 152.

A cross-sectional view of a first embodiment of the needle shielding means 150 is illustrated in FIG. 22. In this embodiment, the elongated, convex magnifying arrangement 152 is formed integrally with the needle shielding means 150. If dosage indicia is disposed on opposing sides of a syringe, an additional magnifying arrangement 152', of similar construction, may be incorporated into the needle shielding means 150.

A needle shielding means 150, including an insertable magnifying arrangement 152'', is shown in cross-section in FIG. 23. The magnifying arrangement 152'' includes a pair of flanges 156 which are slidably insertable within corresponding slots 158 in the needle shielding means 150. The magnifying arrangement 152'' may be fixedly secured within the slots 158 with glue or the like, thereby providing a fixed magnification, or may be removably inserted therein. Advantageously, a user may adjustably control the magnification provided by the instant invention by attaching a magnifying arrangement 152'' having a desired magnification to the needle shielding means 150. Although preferred embodiments have been depicted and described in detail herein, it will be apparent to those skilled in the relevant art that various modifications, additions, substitutions and the like can be made without departing from the spirit of the invention and these are therefore considered to be within the scope of the invention as defined in the following claims.

Claims

We Claim : 1. A plunger for an aspirating single use syringe comprising: a cylindrical plunger stem being hollow at an open end thereof, said plunger stem having a plurality of circumferentially spaced slots extending longitudinally at said open end thereof and being constricted on an interior of said open end thereof; a piston attached to said open end of said plunger stem; a first connecting member connected to said piston and extending into said open end of said plunger stem, said first connecting member comprising a plurality of circumferentially spaced arms extending longitudinally away from said piston, said circumferentially spaced arms forming a first aperture at an interior thereof and said circumferentially spaced arms flared at an exterior thereof on an end opposite said connection to said piston; a second connecting member comprising a plurality of protrusions extending radially away from a second aperture, said second connecting member positioned within said plunger stem so that said plurality of protrusions slide within said plurality of slots; and a third connecting member comprising a longitudinal nipple slidable within said second aperture and matable with said first aperture, wherein when said nipple is mated with said first aperture, the flared circumferentially spaced arms of said first connecting member snugly mate with said constricted interior of said plunger stem.
2. The plunger of claim 1 wherein said first connecting member is integral with said piston.
3. An aspirating single use syringe comprising: a hollow cylindrical housing closed at its front end by a wall so as to form an interior thereof; means for mounting a needle in said wall, wherein when said needle is mounted in said wall, said needle is in fluid communication with the interior of said hollow cylindrical housing; and a plunger, said plunger comprising: a cylindrical plunger stem being hollow at an open end thereof, said plunger stem having a plurality of circumferentially spaced slots extending longitudinally at said open end thereof and being constricted on an interior of said open end thereof; a piston attached to said open end of said plunger stem; a first connecting member connected to said piston and extending into said open end of said plunger stem, said first connecting member comprising a plurality of circumferentially spaced arms extending longitudinally away from said piston, said circumferentially spaced arms forming a first aperture at an interior thereof and said circumferentially spaced arms flared at an exterior thereof on an end opposite said connection to said piston; a second connecting member comprising a plurality of protrusions extending radially away from a second aperture, said second connecting member positioned within said plunger stem so that said plurality of protrusions slide within said plurality of slots ; and a third connecting member comprising a longitudinal nipple slidable within said second aperture and matable with said first aperture, wherein when said nipple is mated with said first aperture, the flared circumferentially spaced arms of said first connecting member snugly mate with said constricted interior of said plunger stem, said piston of said plunger snugly inserted into an open rear end of said hollow cylindrical housing and slidable within said hollow cylindrical housing, and said radial extension of said plurality of protrusions contacting the interior of said hollow cylindrical housing such that said second connecting member friction fits within said interior of said hollow cylindrical housing.
4. A method of preventing multiple use of a syringe which method comprises the steps of: selecting the single use syringe of claim 3 for dispensing a liquid therefrom; positioning said nipple within said first aperture and drawing a liquid into said single use syringe, wherein said drawing comprises drawing said plunger away from said front end of said hollow cylindrical housing, causing said protrusions to position at a forward end of said slots; and dispensing the liquid from the single use syringe, wherein said dispensing comprises pushing said plunger toward said front end of said hollow cylindrical housing, causing said protrusions to position at a rearward end of said slots thereby removing said nipple from said first aperture; wherein when said liquid has been dispensed from said single use syringe, said syringe cannot again be used to draw a liquid into said syringe due to the removal of said nipple from said first aperture, such that subsequent drawing of said plunger causes said constricted interior on the front end of said plunger stem to compress said flared exterior of said circumferentially spaced arms, thereby disengaging said plunger stem from said piston and said first connecting member.
5. A method of preventing multiple use of an aspirating syringe which method comprises the steps of: selecting the single use syringe of claim 3 for aspirating and dispensing a liquid therefrom; positioning said nipple within said first aperture and drawing a liquid into said single use syringe, wherein said drawing comprises drawing said plunger away from said front end of said hollow cylindrical housing, causing said protrusions to position at a forward end of said slots; and alternately pushing said plunger toward said front end of said hollow cylindrical housing and drawing said plunger away from said front end of said hollow cylindrical housing, such that said nipple slides within said second aperture and said protrusions slide within said slots without contacting said rearward end of said slots, thereby aspirating with said single use syringe; and dispensing the liquid from the single use syringe by pushing said plunger toward said front end of said hollow cylindrical housing and contacting said protrusions with said rearward end of said slots, thereby removing said nipple from said first aperture; wherein when said liquid has been dispensed from said single use syringe, said syringe cannot again be used to draw a liquid into said syringe due to the removal of said nipple from said first aperture, such that subsequent drawing of said plunger causes said constricted interior on the front end of said plunger stem to compress said flared exterior of said circumferentially spaced arms, thereby disengaging said plunger stem from said piston and said first connecting member.
6. A magnifying shield for a syringe, wherein said syringe includes a needle and a housing having dosage indicia thereon, comprising: a shielding apparatus for preventing multiple uses of said syringe, said shielding apparatus including a magnifying arrangement for magnifying the dosage indicia on said syringe housing.
7. The magnifying shield for a syringe according to Claim 6, further including: means for movably positioning said shielding apparatus about said syringe housing, said shielding apparatus being movable between an extended position surrounding and shielding said syringe needle, and a retracted position in which said syringe needle is exposed for use.
8. The magnifying shield for a syringe according to Claim 7, wherein said shielding apparatus further includes: means for locking said shielding apparatus in said extended position.
9. The magnifying shield for a syringe according to Claim 7, wherein said magnifying arrangement is disposed proximate said dosage indicia when said shielding apparatus is in said retracted position, said magnifying arrangement enlarging said dosage indicia.
10. The magnifying shield for a syringe according to Claim 6, wherein said magnifying arrangement extends longitudinally along said shielding apparatus.
11. The magnifying shield for a syringe according to Claim 10 wherein said magnifying arrangement extends longitudinally along substantially an entire length of said shielding apparatus.
12. The magnifying shield for a syringe according to Claim 10, wherein said magnifying arrangement has a convex shape which is adapted to enlarge said dosage indicia when said magnifying arrangement is positioned thereover.
13. The magnifying shield for a syringe according to Claim 12, wherein said magnifying arrangement is formed integrally with said shielding apparatus from a clear material.
14. A method for preventing multiple uses of a syringe, wherein said syringe includes a needle and a housing having dosage indicia thereon, and for magnifying said dosage indicia during an initial usage of said syringe, comprising the steps of: providing a tubular shielding apparatus for selectively shielding said syringe needle, said shielding apparatus being movable between a retracted position in which said syringe needle is exposed during said initial usage, and an extended position surrounding and shielding said syringe needle; providing said shielding apparatus with a magnifying arrangement for magnifying the dosage indicia on said syringe housing while said shielding apparatus is in said retracted position; and locking said shielding apparatus in said extended position wherein, in said extended position, said magnifying arrangement of said shielding apparatus does not enlarge said dosage indicia.
15. The method for preventing multiple uses of a syringe according to Claim 14, further including the step of: forming said magnifying arrangement integrally with said shielding apparatus, said magnifying arrangement forming a side portion of said shielding apparatus.
16. The method for preventing multiple uses of a syringe according to Claim 14, further including the step of: forming said magnifying arrangement in a convex configuration, said magnifying arrangement extending longitudinally along said shielding apparatus and forming a side portion thereof.
PCT/US1995/003512 1994-03-31 1995-03-20 Apparatus for shielding a syringe needle WO1995026764A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US08/220,867 US5352203A (en) 1994-03-31 1994-03-31 Aspirating non-reuseable syringe
US08/220,867 1994-03-31
US08/381,193 US5498243A (en) 1995-01-31 1995-01-31 Apparatus for shielding a syringe needle
US08/381,193 1995-01-31

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Application Number Priority Date Filing Date Title
AU21889/95A AU2188995A (en) 1994-03-31 1995-03-20 Apparatus for shielding a syringe needle

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WO1995026764A1 true WO1995026764A1 (en) 1995-10-12

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
WO2000016830A1 (en) * 1998-09-24 2000-03-30 Tretout Jean Pierre Device for protecting an injection syringe cannula or needle
EP1464353A1 (en) * 2000-01-27 2004-10-06 Afra Design PTY. Limited A single-use syringe
US8876764B2 (en) 2011-01-21 2014-11-04 Sid Technologies, Llc Intradermal pen adapter
US9089655B2 (en) 2009-07-23 2015-07-28 Sid Technologies, Llc Intradermal injection adapter
US9327086B2 (en) 2010-03-12 2016-05-03 Sid Technologies, Llc Needle shield and adapter fixedly attached to syringe
US9474865B2 (en) 2013-04-25 2016-10-25 West Pharmaceutical Services, Inc. Needle shield for disposable syringe with annular ring

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US4391272A (en) * 1978-03-10 1983-07-05 Tulcea, S.A. Disposable syringe
US4743234A (en) * 1987-05-18 1988-05-10 The Cloverline, Inc. Syringe magnifier
US4883466A (en) * 1988-04-25 1989-11-28 Glazier Stephen C Non-reusable syringe
US5019045A (en) * 1988-03-28 1991-05-28 Lee Sang D Hypodermic syringe with a locking needle assembly and syringe combination

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US4391272A (en) * 1978-03-10 1983-07-05 Tulcea, S.A. Disposable syringe
US4743234A (en) * 1987-05-18 1988-05-10 The Cloverline, Inc. Syringe magnifier
US5019045A (en) * 1988-03-28 1991-05-28 Lee Sang D Hypodermic syringe with a locking needle assembly and syringe combination
US4883466A (en) * 1988-04-25 1989-11-28 Glazier Stephen C Non-reusable syringe

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000016830A1 (en) * 1998-09-24 2000-03-30 Tretout Jean Pierre Device for protecting an injection syringe cannula or needle
FR2783716A1 (en) * 1998-09-24 2000-03-31 Jean Pierre Tretout A protective device for the cannula or the needle of an injection syringe
EP1464353A1 (en) * 2000-01-27 2004-10-06 Afra Design PTY. Limited A single-use syringe
US6997901B2 (en) 2000-01-27 2006-02-14 Biomd Limited Single-use syringe
US9089655B2 (en) 2009-07-23 2015-07-28 Sid Technologies, Llc Intradermal injection adapter
US9327086B2 (en) 2010-03-12 2016-05-03 Sid Technologies, Llc Needle shield and adapter fixedly attached to syringe
US8876764B2 (en) 2011-01-21 2014-11-04 Sid Technologies, Llc Intradermal pen adapter
US9474865B2 (en) 2013-04-25 2016-10-25 West Pharmaceutical Services, Inc. Needle shield for disposable syringe with annular ring

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