WO2016185212A1 - Seringue d'anesthésie dentaire à usage unique. - Google Patents

Seringue d'anesthésie dentaire à usage unique. Download PDF

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Publication number
WO2016185212A1
WO2016185212A1 PCT/GB2016/051440 GB2016051440W WO2016185212A1 WO 2016185212 A1 WO2016185212 A1 WO 2016185212A1 GB 2016051440 W GB2016051440 W GB 2016051440W WO 2016185212 A1 WO2016185212 A1 WO 2016185212A1
Authority
WO
WIPO (PCT)
Prior art keywords
safety syringe
syringe according
disposable dental
barrel
dental safety
Prior art date
Application number
PCT/GB2016/051440
Other languages
English (en)
Inventor
Alan Julian Segal
Original Assignee
Astek Innovations Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Astek Innovations Limited filed Critical Astek Innovations Limited
Publication of WO2016185212A1 publication Critical patent/WO2016185212A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3271—Means 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
    • A61M5/3272—Means 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3202—Devices for protection of the needle before use, e.g. caps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3247—Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2202/00—Special media to be introduced, removed or treated
    • A61M2202/02—Gases
    • A61M2202/0241—Anaesthetics; Analgesics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2210/00—Anatomical parts of the body
    • A61M2210/06—Head
    • A61M2210/0625—Mouth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2210/00—Anatomical parts of the body
    • A61M2210/06—Head
    • A61M2210/0625—Mouth
    • A61M2210/0637—Teeth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/3148—Means for causing or aiding aspiration or plunger retraction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3271—Means 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

Definitions

  • the present invention relates to disposable dental syringes and in particular to disposable dental safety-syringes including means for preventing needle-stick injury.
  • dental syringes are often used more than once on the same patient so need to be left ready for use in between inj ections; need to be compatible with standard anaesthetics cartridges which often need to be changed during use; must be compatible with a range of standard screw-on needles which must be removed after use; and often need to be passed between dentist and nurse.
  • Syringes used in the dental industry have traditionally been of the non-disposable type which require sterilisation by autoclave after each use.
  • An example of a non- disposable i.e. reusable safety syringe is set out in EP1465690.
  • the cost and inconvenience of autoclaving a traditional non-disposable syringe can be prohibitive. This is particularly true of those working in dental hospitals or schools where autoclaving is done by an external sub-contractor, or those working in the armed forces without easy access to sterilising equipment. In these instances there is a market for a completely disposable dental safety-syringe.
  • the syringe consists of reusable plunger assembly which fits onto a disposable body with a built-in needle. As shown in figure 1, the syringe body (1) has a plastic sleeve portion (2) which can be pulled forward to protect the needle (not shown) when not in use.
  • the sleeve is operated by pulling it over features on the body so that it locks into place, it has two positions 'park' (for use in between injections), in which the sleeve is pulled over a bulge 3 in the barrel and 'permanent lock' (for use after final injection for disposal), in which the sleeve is pulled beyond the bulge, such that an inwardly extending circumferential rib 4 in the rear of the sleeve clips into a circumferential groove 5 in the barrel.
  • This product has had some success and works fairly well; however there are 3 main limitations of the design: 1.
  • the sleeve locking mechanism is not sufficiently positive.
  • the syringe has a built-in needle and, although this adds convenience, there are a wide variety of lengths and gauges of screw-on needles available to the dentists for use in different applications. By having the needle built-in, user choice and product flexibility is greatly reduced.
  • a disposable dental safety syringe comprising a barrel to receive a cartridge of injectable liquid, said barrel having a forward end for connection to a needle and a rearward end for receiving a plunger; and a sleeve mounted relative to the barrel so as to be slidable towards a position at which it is retained on the barrel but extends beyond the forward end to sheath the needle; wherein a lock is provided, the lock comprising circumferentially offset cooperable configurations interengageable by rotation to move between a release position and a temporary lock position and to a permanent lock position; wherein: in the release position, axial movement of the sleeve relative to the barrel is possible; in the temporary lock position, axial movement of the sleeve relative to the barrel is restricted, but rotation back to the release position is possible; and in the permanent lock position both axial movement of the sleeve relative to the barrel and rotation back to the release position are restricted.
  • a rotatable lock rather than the axial lock proposed in the prior art disposable dental syringe, creates a more positive lock, requiring two different motions, twisting and pushing axially to unsheathe the needle from the temporary position, making accidental unlocking much less likely.
  • a permanent locking position in which rotation back to the release position is restricted, makes it significantly less likely that the needle will become unsheathed, even upon application of a large force.
  • the temporary lock position is for use between injections and the permanent lock position is for use once the final inj ection has been administered, prior to disposal.
  • the circumferentially offset cooperable configurations may comprise one or more first cooperable configurations being a temporary lock and one or more second cooperable configurations being a permanent lock.
  • the first cooperable configuration may comprise a first formation.
  • the first formation may interengage with a rib.
  • the first formation may be inwardly extending.
  • the first formation may comprise a ramp surface.
  • the first formation may comprise two ramp surfaces.
  • the rib may be provided on the barrel.
  • the rib may be provided on the sleeve.
  • the first formation may be outwardly extending.
  • a plurality of ribs may be provided.
  • the or each rib may extend from the rear of the barrel, but be spaced from the front of the barrel.
  • the first formation may be semi-cylindrical or semi-spherical.
  • a plurality of first formations may be provided.
  • the second cooperable configuration may comprise a second formation.
  • the second formation may interengages with a rib.
  • the second formation may extend inwardly.
  • the second formation may comprise a ramp surface.
  • the second formation may comprise a stop surface.
  • the height of the second formation may be higher than the height of the first formation.
  • the height of the second formation may be at least twice as high as the height of the first formation.
  • a plurality of second formations may be provided.
  • the first and/or second formations may be formed in the sleeve.
  • the first or second formations may be formed by cutouts in the sleeve.
  • the first and/or second formations may be formed on a collar.
  • the collar may be integral with the sleeve.
  • the lock may be provided at the rear end of the sleeve.
  • the lock may be rotatable about the axis of the barrel between the temporary lock and the release positions and to the permanent lock position.
  • Said positions may be limit positions.
  • the sleeve may have a main tubular body portion which is restrained against rotation around the barrel.
  • the sleeve may comprise one or more grooves, which are aligned with one or more ribs in the barrel in the release position.
  • the depth of the grooves may be substantially equal to the height of the second formations.
  • the lock may be arranged to lock the sleeve in the position at which it is retained on the barrel but extends beyond the forward end to sheath the needle.
  • the syringe may comprise a plunger having an overmoulded rubber seal to allow aspiration of the syringe.
  • the barrel, the sheath, and/or the plunger may be formed from a material which is not suitable for sterilisation by autoclaving.
  • Marks may be provided to show whether the lock is in the temporary lock, permanent lock, or release position.
  • the marks may comprise an indicator on the collar and corresponding markers on the barrel.
  • Figure 1 shows a lateral cross section through a portion of a prior art safety syringe
  • Figure 2a shows an isometric view of a syringe according to the invention with the sleeve pushed rearwards
  • Figure 2b shows an isometric view of the syringe of figure 2a with a needle attached
  • Figure 2c shows an isometric view of the syringe of figure 2b with the sleeve pushed forwards and rotated to the temporary lock position, to sheath the needle;
  • Figure 3 shows an exploded plan view of the syringe of figures 2a to 2c;
  • Figure 4 shows a cross section through the syringe of figures 2a and 2b looking down the barrel (forwards) from the forward end of the collar
  • Figure 5 a shows a cross section through the syringe of figures 2a and 2b looking down the barrel (forwards) from the rearward end of the collar, with the sleeve in the temporary lock position
  • Figure 5b shows a cross section through the syringe of figures 2a and 2b looking down the barrel (forwards) from the rearward end of the collar, with the sleeve in the permanent lock position;
  • Figure 5 c shows a cross section through the syringe of figures 2a and 2b looking down the barrel (forwards) from the rearward end of the collar, with the sleeve in the release position;
  • a dental syringe has a barrel 10 in the form of a tube of generally circular cross section, which is open at its rear (distal) end and constricted at its forward (proximal) end and has diametrically opposed cut-out side openings 11.
  • a pair of diametrically opposed, longitudinally extending ribs 16 are formed on the outside of the barrel between the side openings 11. The ribs 16 extend from the rear of the barrel, but are spaced from the front of the barrel.
  • the barrel 10 has a finger grip structure 12 formed at the rearward open end, with a plunger 13 extending through the finger grip structure 12, via a plunger guide 14.
  • the plunger terminates at a forward free end with an enlarged head formed by an overmoulded rubber seal 21 and at a rearward end with a further finger grip 15.
  • the barrel 10 At its constricted forward end, the barrel 10 has an integral end portion 17, having an annular front end wall having a forward central axially extending projection 19 with an external screw thread and an internal axial through bore 20.
  • the barrel 10, including the finger grip structure 12, the plunger 13 and its guide 14 may all be formed from plastics and need not be capable of withstanding disinfection by autoclaving, or other techniques.
  • a sleeve 22 comprising an open ended generally circular cross section tubular portion 23 having a slightly larger diameter than that of the barrel 10 and comprising a pair of diametrically opposed internal grooves 26, which slidably interfit with the ribs 16 fit.
  • the tube may be transparent or may have transparent or cut-out side sections for viewing the plunger 13 or a cartridge 24 through the side opening 11 in the barrel 10.
  • the sleeve 22 may also be formed from plastics that need not be capable of withstanding disinfection, since the syringe is intended to be disposed of.
  • the sleeve 22 can slide to a rearmost position (figures 2a and 2b) at which its rear end abuts or is close to the finger grip structure 15 and its front end is generally level with the forward end of the barrel 10.
  • the sleeve 22 can slide to a forwards position (figure 2c) at which its rear end is slightly behind the front end of the barrel 22 and the sleeve extends forward beyond such front end.
  • a locking member 25 is integrally formed in the form of an open ended collar of greater outer diameter than the tube 23.
  • the internal grooves 26 extend into the forward end of the locking member 25, which has the same internal shape as the remainder of the sleeve 22, with grooves 26 which align with the ribs 16 and a generally circular cross section, following the shape of the remainder of the generally circular barrel 10.
  • cutouts of larger internal diameter are formed in the rearward end of the locking member 25, such that when the tubular portion 23 of the sleeve 22 is pulled right forward, to the un-ribbed region where the ribs are spaced from the front of the barrel 10, the rear ends of the grooves 26 are no longer situated over the ribs 16, and the sleeve 22 can be twisted, so as to bring the ribs 16 out of alignment with the grooves 26.
  • These cutouts co-operate with the ribs 16 to form a lock.
  • a first circumferentially offset cooperable configuration 27 is formed, which is a temporary (releasable) lock.
  • Each of the two diametrically opposed first circumferentially offset cooperable configurations 27 consist of a rib-receiving recess 28 circumferentially offset from the groove 26 and separated therefrom by a radially inwardly extending formation 29 having two ramp-surfaces.
  • the inwardly extending formation 29 extends inwardly by a first distance, so as to have a height of about half of the depth of the groove 26.
  • Twisting the collar allows the ribs 16 to move up relatively easily over the first ramp surface of the cooperable configurations 27 and down the second ramp surface into the recess 28, to the position shown in figure 5a.
  • This is the temporary lock position, as the formation 29 only extends slightly inwardly and, owing to the second ramp surface and the relatively small height of the inwardly extending formation 29, can be easily twisted (anticlockwise) back to the release position of figure 5c.
  • axial movement of the sleeve 22 relative to the barrel is restricted, because the rib 16 is out of alignment with the groove 26. Since the cut-outs are only formed in the rear part of the collar, not all the way along the length of the sleeve, the (forward) end of the ribs 16 is prevented from moving axially along the sleeve by stop faces 30.
  • a second circumferentially offset cooperable configuration 31 is formed, which is a permanent (non-releasable) lock.
  • Each of the two diametrically opposed second circumferentially offset cooperable configurations 31 consist of a rib-receiving recess 32 circumferentially offset from the groove 26 and separated therefrom by a radially inwardly extending permanent lock formation 33 having one ramp surface 34 and one stop surface 35.
  • the ramp surface 34 of the permanent lock formation 33 is adjacent the groove 26.
  • twisting the collar allows the ribs 16 to move up over the ramp surface 34 of the cooperable configuration 31 and over the stop surface 35 into the recess 32, to the position shown in figure 5b.
  • the formation 31 extends significantly inwardly, being substantially the same height as the depth of the groove 26 and, owing to the stop surface 35, which is not ramped, twisting (clockwise) back to the release position of figure 5c is prevented.
  • a snap-fit finger 37 (figure 3) is formed near the front end of the barrel 10, with a radially outwardly extending lug, which can be depressed to allow the sleeve 22 to fit onto the barrel, but is arranged to interfere with a corresponding formation (not shown) in the sleeve 22, if it is pulled too far forwards, and thereby prevent the sleeve 22 from being entirely displaced off the barrel 10.
  • the syringe described is used with a conventional anaesthetic-filled cartridge 24, in the form of a glass tube sealed with a rearend bung and a front end membrane and a needle 38 (fig 3) comprising a stainless steel tube member 39 with an attached hub 40, in the form of an internally threaded cap, adjacent to, but spaced from its rear end.
  • a conventional anaesthetic-filled cartridge 24 in the form of a glass tube sealed with a rearend bung and a front end membrane and a needle 38 (fig 3) comprising a stainless steel tube member 39 with an attached hub 40, in the form of an internally threaded cap, adjacent to, but spaced from its rear end.
  • Various embodiments of the syringe are envisaged with the forward central axially extending projection 19 sized appropriately for different standard screw-on-needles 38.
  • the cartridge 24 is inserted through the side opening 11 of the barrel 10.
  • the plunger head 21 can then be moved forward to engage the cartridge bung.
  • the needle hub 40 is screwed onto the end projection 19 with the sleeve 22 in its rearward position. This causes the rear end portion of the needle 39 to pass through the bore 20 so as to be directed into a position to penetrate the membrane at the front end of the cartridge 24.
  • the sleeve 22 can now be moved to its forward position, in which it completely covers the needle 38.
  • the sleeve can be releasably held in this position by rotating the collar 25 such that the first circumferentially offset cooperable configurations 27 in the collar 25 and the ribs 16 interact.
  • An indicator 41 formed on the outer surface of the collar 25 aligns with a marker 42 on the barrel 10 to show that the temporary lock position is engaged.
  • the collar 25 can be rotated back to the release position (where the ribs 16 are aligned with the grooves 26) and the sleeve 22 can then be moved back to its rearward position.
  • the needle 38 is thereby exposed for use.
  • the sleeve 22 is again moved to its forward position and rotated to the temporary lock position.
  • the sleeve 22 is brought to its forward position and the collar 25 is rotated in the opposite direction, such that the second circumferentially offset cooperable configurations 31 interact with the ribs 16, with the ribs 16 held against counter-rotation by the stop faces 36.
  • This rotation brings the indicator 41 into alignment with a second marker 43 on the barrel 10 to show that the permanent lock position is engaged.
  • ribs 16 having parallel sides have been disclosed, whereby one parallel side interacts with a parallel stop surface 35 in the permanent lock-position, and the other parallel side rides up a ramp to move out of the temporary lock position.
  • the ribs need not have that shape and, if the side that rides up the ramp surface of the radially inwardly extending formation 29 was itself ramped, it could assist sliding up the ramped surface of the inwardly extending formation 29. Indeed, in that case, the inwardly extending formation 29 need not even be ramped.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hematology (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Environmental & Geological Engineering (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

La présente invention concerne une seringue de sécurité dentaire à usage unique comprenant un cylindre et un manchon capable de découvrir ou de recouvrir une aiguille. L'aiguille peut être recouverte de manière permanente ou temporaire, ou découverte dans une position de libération, selon les besoins de l'utilisateur. Le manchon comprend un verrou qui fournit des configurations pouvant coopérer, décalées de manière circonférentielle, s'emboîtant l'une dans l'autre par rotation afin de se déplacer entre la position de libération et une position de verrouillage temporaire et vers une position de verrouillage permanent. Les configurations pouvant coopérer, décalées de manière circonférentielle, comprennent un certain nombre de formations s'étendant vers l'intérieur prévues sous la forme de multiples surfaces de rampe et surfaces d'arrêt. Les surfaces de rampe et d'arrêt permettent des mouvements axiaux et de rotation particuliers du manchon de manière à atteindre une position de manchon souhaitée sur le cylindre. Temporairement recouvrir l'aiguille entre deux utilisations réduit considérablement le risque de blessure par piqûre d'aiguille, en particulier lorsque la seringue est passée entre des utilisateurs de manière à, par exemple, insérer de nouvelles cartouches de médicament.
PCT/GB2016/051440 2015-05-21 2016-05-19 Seringue d'anesthésie dentaire à usage unique. WO2016185212A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1508705.9A GB2538708A (en) 2015-05-21 2015-05-21 Disposable anaesthetic syringe
GB1508705.9 2015-05-21

Publications (1)

Publication Number Publication Date
WO2016185212A1 true WO2016185212A1 (fr) 2016-11-24

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ID=53506111

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2016/051440 WO2016185212A1 (fr) 2015-05-21 2016-05-19 Seringue d'anesthésie dentaire à usage unique.

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Country Link
GB (1) GB2538708A (fr)
WO (1) WO2016185212A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210316083A1 (en) * 2020-04-14 2021-10-14 Jelani T. Washington Mandibular Anesthesia Curved Dental Needle
US11622755B2 (en) * 2016-11-10 2023-04-11 Cihan Kabadayi First responder device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5401249A (en) * 1993-06-07 1995-03-28 Shields; Jack W. Safely disposable, non-reusable injection device
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