WO1992018183A1 - Ensemble seringue/fourreau pour aiguille - Google Patents

Ensemble seringue/fourreau pour aiguille Download PDF

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Publication number
WO1992018183A1
WO1992018183A1 PCT/US1991/002579 US9102579W WO9218183A1 WO 1992018183 A1 WO1992018183 A1 WO 1992018183A1 US 9102579 W US9102579 W US 9102579W WO 9218183 A1 WO9218183 A1 WO 9218183A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubular member
distal
needle
distal end
assembly
Prior art date
Application number
PCT/US1991/002579
Other languages
English (en)
Inventor
Daniel Andreas Talonn
Alan Bernard Ranford
Original Assignee
Sherwood Medical Company
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 Sherwood Medical Company filed Critical Sherwood Medical Company
Priority to CA002085371A priority Critical patent/CA2085371C/fr
Priority to PCT/US1991/002579 priority patent/WO1992018183A1/fr
Publication of WO1992018183A1 publication Critical patent/WO1992018183A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—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
    • A61M5/24—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
    • 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

Definitions

  • This invention relates to syringes and, for example to a conventional syringe of the type adapted to receive a medication-containing cartridge therein but having a novel extendable needle shield primarily for the purpose of preventing or minimizing accidental needle sticks.
  • One approach to this problem is to provide an extendable needle shield which, after the syringe has been used, can be pushed to an extended position where it covers the needle, making it difficult for an individual to accidentally contact the needle.
  • a common feature of such constructions is that when the needle shield is pushed to its extended position, it is locked so that it cannot be retracted (thus exposing the needle) except by application of extraordinary force.
  • a number of such constructions have been proposed to satisfy the general requirement that the needle be permanently covered after the syringe has been used. Some of these constructions involve complex locking mechanisms and, in others, locking occurs automatically when the shield is fully extended. These known devices satisfy many of the functional requirements of a needle shield but require, in most cases, modification of the standard syringe construction. This is highly undesirable for many manufacturers because of the sizable investment they may have already made in their existing molding equipment for producing the syringes. Constructions have also been proposed which include an opening or slot in the side of the shield. This is undesirable because the needle can extend through the opening if the needle or the needle shield is deflected when the needle shield is in the extended position. Other proposed devices include open ended needle shields which may not block access to the needle point by small fingers.
  • the outer diameter of the distal end of the needle shield should be minimized so that the dentist is able to better observe the needle of the dental syringe during the use thereof and so that the distal end of the needle shield does not interfere with the placement or use of other instruments which may simultaneously be present in the patient's mouth. Accordingly, it is an object of this invention to provide a protective needle shield of the type described above which can be added at minimal expense to conventional hypodermic or dental syringes.
  • Another object of the present invention is to provide a relatively inexpensive protective shield which satisfies the functional requirements of a needle shield and which includes none of the drawbacks mentioned above.
  • Another object of the present invention is to provide an extendable needle shield for a dental syringe which performs all of the necessary functions of such a shield and which is particularly well suited to an automated process of manufacture.
  • a further object of the present invention is to provide an extendable needle shield for a standard hypodermic or dental syringe which is improved both from the points of view of functional utility and cost of manufacture.
  • a still further object of the present invention is to provide an inexpensive method of assembling a protective needle shield and dental syringe.
  • a needle shield is mounted coaxially on a syringe barrel.
  • the needle shield includes one or more elongated keys on its inner surface.
  • a collar is provided on the distal end of the barrel adjacent to the needle or needle hub.
  • the collar may be a separate part or it may be integrally formed with the barrel and includes on its outer surface at least one locking slot. The key slides in a path outside of the locking slot and can be rotated into the locking slot when the needle shield is extended. Both the collar and shield can be molded from plastic materials so that the cost of the shield is relatively low.
  • the needle shield includes a plurality of elongated locking keys and the collar includes a plurality of locking slots.
  • Each locking slot is defined by opposing walls, at least one of which includes a ramp over which the keys can ride when the shield is in its extended position and subsequently rotated to an extended and locked position.
  • protrusions on the collar and the forward portions of the keys are shaped such that during assembly, the keys are directed into keyways formed between the locking slots as the collar is moved relative to the needle shield.
  • a further feature of the present invention is the provision of a needle shield having a reduced diameter distal end to allow for the attachment of a needle protecting needle sheath thereon.
  • Figure 1 is a perspective view of an embodiment of the present invention shown mounted on a conventional dental syringe with the needle shield in the extended position;
  • Figure 2 is a side elevation view, partially in cross- section taken along lines 11—11 as shown in Figure 1 and shown with the medication cartridge in the dental syringe and with the needle shield in the retracted position;
  • Figure 3 is a fragmentary side cross-sectional view also taken along lines 11—11 as shown in Figure 1 and shown with the needle shield in the extended position;
  • Figure 4 is an enlarged scale, fragmentary side sectional view taken along lines 13—13 as shown in Figure 2 and showing details of the collar and needle shield thereof;
  • Figure 5 is a fragmentary sectional view taken along lines 14—14 in Figure 2 and showing a portion of the needle shield in the extended position prior to rotation of the needle shield
  • Figure 6 is a fragmentary sectional view taken along lines 14—14 in Figure 2 and showing a portion of the needle shield in the extended and locked position after rotation
  • Figure 7 is an enlarged scale, perspective view of the collar shown in Figure 2.
  • the invention is intended to be used in conjunction with a standard hypodermic syringe; however, a protective needle shield in accordance with the invention may be modified for use with any medical, laboratory or dental device having a needle, such
  • SUBSTITUTE SHEET as a blood collection tube holder or dental syringe with a double ended needle (as described hereinafter) without departing from the contemplated scope of the present invention. Accordingly, as used herein, the term "syringe" is intended to include any medical or scientific device including a needle wherein it is desired to protect a user from accidental needle sticks.
  • distal end of a part refers to the end of the part closest to the needle point.
  • proximal end of a part refers to the end furthest from the needle point.
  • FIG. 1 through 7 An embodiment of the present invention is illustrated in Figures 1 through 7 with the collar and needle shield adapted for use on a conventional dental syringe of the type adapted to receive a medication cartridge removably mounted therein.
  • the dental syringe of the present embodiment is generally designated as dental syringe 150.
  • the dental syringe 150 of the present embodiment includes an elongate and tubular cartridge holder assembly 166 adapted to receive a conventional medication cartridge 167 therein.
  • a conventional injector assembly 152 is mounted on the proximal end of the cartridge holder assembly 166.
  • the distal end of the cartridge holder assembly 166 includes a double ended needle assembly 176 mounted therein and a tubular collar assembly 186 mounted thereon.
  • the collar assembly 186 slidably contacts an elongate and tubular needle shield assembly 210 which is longitudinally movable over the cartridge holder assembly 166 and the collar assembly 186.
  • a conventional needle sheath assembly 220 is removably mounted on the distal end of the needle shield assembly 210.
  • the cartridge holder assembly 166 of the present embodiment includes an elongate and tubular proximal barrel section 168. a tapered barrel
  • SUBSTITUTESHEET section 170 fixedly mounted on the distal end thereof and an integral distal barrel section 172 on the distal end of the tapered barrel section 170.
  • the proximal end of the proximal barrel section 168 includes a pair of radially extending retention flanges 169. the function of which are described hereinafter.
  • the interior surface of the proximal barrel section 168 has a generally uniform internal diameter which is adapted to receive a conventional medication cartridge 167 therein.
  • the medication cartridge 167 referred to herein is a commercially available medication cartridge having an injectable medication therein, one example of which is a 1.8 ml cartridge which contains a 2% lidocaine HCl injection with epinephrine in a concentration of 1:100,000 manufactured by Astra
  • the medication cartridge 167 includes an elongate glass cylinder 165 with a rubber piston or plunger member 171 movably mounted in the proximal end of the cylinder 165.
  • the distal end of the medication cartridge 167 includes a metal cap 173 fixedly mounted on a reduced portion of the cylinder 165.
  • the metal cap 173 includes a central orifice (not shown) positioned over a needle pierceable diaphragm 175.
  • the tapered barrel section 170 at the distal end of the cartridge holder assembly 166 decreases in external diameter from the distal end of the proximal barrel section 168 to a smaller diameter and integrally connected, cylindrically-shaped distal barrel section 172.
  • the external surface of the distal barrel section 172 preferably includes four equally spaced ribs 184 thereon ( Figure 3) .
  • the distal end of the ribs 184 extend from the distal end of the distal barrel section 172 so that the outer diameter of the
  • SUBSTITUTESHEET distal barrel section 172 is generally uniform about and along the longitudinal axis thereof.
  • the barrel section 172 surrounds the needle hub 174 of the integral double ended needle assembly 176 as illustrated in Figure 2.
  • the needle assembly 176 further includes an elongate and hollow distal needle section 178 which extends beyond the distal end of the cartridge holder assembly 166 to a sharpened distal needle point 179 and an integral and elongate hollow proximal needle section 180 which extends into and within the distal end of the cartridge holder assembly 166 to a sharpened proximal needle point 181 located proximally of the tapered barrel section 170.
  • a cylindrical cartridge positioning hub 182 is located on the proximal side of the needle hub 174 and extends proximally from the needle hub 174 to a location generally adjacent to the midpoint of the tapered barrel section 170. The positioning hub 182 encircles and supports the majority of the proximal needle section 180 and is adapted to contact the distal end of the medication cartridge 167 when the medication cartridge 167 is inserted into the cartridge holder assembly 166 as described hereinafter.
  • the tubular collar assembly 186 of the present embodiment preferably includes six equally spaced and integrally formed triangularly- shaped protrusions 188 which extend radially from the circumferential surface of the collar assembly 186.
  • the apex of each of the triangularly-shaped protrusions 188 is positioned along the proximal side of the collar assembly 186 to assist in the assembly of the present embodiment as described hereinafter.
  • Each of the protrusions 188 also include angled surfaces 188A and 188B, side surfaces 192. and a distal surface 196 which extend perpendicularly from the surface of the collar assembly 186.
  • a recessed slot 194 extends distally from the apex of
  • each of the triangularly shaped protrusions 188 to a sloped distal surface 194A, the function of which is described hereinafter.
  • the distal surface 196 of each protrusion 188 forms a generally circumferential surface along the distal side of the protrusion 188 approximately midway along the external surface of the collar assembly 186.
  • the side surfaces 192 of each adjacent pair of protrusions 188 form keyways 190 therebetween, the function of which is described hereinafter.
  • a radially extending and spherical detent 208 is positioned in the keyways 190 between each pair of protrusions 188 such that the distal edge of each spherical detent 208 is located slightly distal to the distal surface 196 of each protrusion 188 and the proximal edge of each spherical detent 208 is located slightly proximal to the side surfaces 192 of each protrusion 188.
  • a pair of parallel walls, 202 and 204. are positioned radially along the lengthwise dimension of the collar assembly 186 adjacent to the distal surface 196 of each protrusion 188.
  • the walls, 202 and 204 form a rectangularly shaped locking slot 206 therebetween, the function of which is described hereinafter.
  • the walls, 202 and 204 preferably include a ramp shaped wall surface on the external side thereof and a perpendicular wall surface on the internal side thereof.
  • the surface of the locking slot 206 is slightly elevated relative to the level of the keyways 190, i.e., the collar diameter at the locking slots 206 is slightly greater than the collar diameter at the keyways 190.
  • SUBSTITUTE SHEET assembly 210 is moved to a locked and extended position ( Figure 3) described hereinafter.
  • the internal surface of the collar assembly 186 includes a wedge-shaped internal tooth member 212 adjacent to the proximal end of the collar assembly 186 which is adapted to engage the outer surface of the distal barrel section 172 and retain the collar assembly 186 on the distal barrel section 172 of the cartridge holder assembly 166 during assembly of the present embodiment as described hereinafter.
  • the collar assembly 186 of the present embodiment is molded of a rigid plastic material such as a polycarbonate resin so that the collar assembly 186 causes a slight deformation of the ribs 184 and distal barrel section 172 as the collar assembly 186 placed on the distal barrel section 172 of the cartridge holder assembly 166.
  • the cartridge holder assembly 166 of the present embodiment includes a conventional injector assembly 152 mounted on the proximal end thereof.
  • the injector assembly includes a bore 153 therethrough for slidably receiving an elongate plunger rod 154 therein.
  • the plunger rod 154 is provided with a conventional enlarged and circular finger ring 156 at the proximal end thereof and a triangularly-shaped and sharpened barb member 158 extending from the distal end thereof.
  • the injector assembly 152 further includes a generally cylindrical body
  • SUBSTITUTE SHE! section 151 having a proximally positioned enlarged oval- shaped finger flange 160 which is adapted to be grasped by the fingers of the user.
  • a cylindrical locking ring 162 is slidably positioned on the body section 151 of the injector assembly 152 distal to the finger flange 160.
  • the body section 151 also includes a generally cylindrically-shaped and resilient, body member 164 which extends distally from the finger flange 160.
  • the body member 164 includes an integral and frustoconically-shaped distal portion 161 having a retaining lip or rim 164A thereon.
  • a pair of longitudinally extending slots or channels 165 are provided on opposite lateral sides of the body member 164.
  • Each channel 165 includes a triangularly-shaped recess 163 adjacent to the distal end thereof which is adapted to receive one of the retention flanges 169 from the cartridge holder assembly 166 therein, as will be discussed more fully hereinafter.
  • the needle shield assembly 210 of the present embodiment preferably includes an elongate and tubular proximal shield section 214 having three equally spaced and rectangularly-shaped elongate keys 198 integrally formed along the interior surface thereof and a tapered shield section 216 which decreases in external diameter from the distal end of the proximal shield section 214 to an integral distal shield section
  • the keys 198 preferably extend lengthwise between the distal and proximal ends of the proximal shield section 214 and include triangularly-shaped distal ends and flat- proximal ends, the function of which are described hereinafter.
  • An end rim 222 is formed along the inner surface of the proximal end of the proximal shield section 214 and is adapted to extend radially inwardly therefrom.
  • Three equally spaced and inwardly extending oblong-shaped detents 200 are formed along the internal surface of the distal end of the needle shield assembly 210.
  • SUBSTITUTESHEET detents 200 are preferably spaced approximately thirty degrees from an adjacent key 198 and include sloped distal surfaces, the function of which are described hereinafter.
  • the distal shield section 218 of the needle shield assembly 210 is a cylindrically shaped tubular member having a centrally located needle aperture 211 therein, as illustrated in Figures 2 and 3.
  • the needle aperture 211 of the distal shield section 218 is sized to allow the distal needle section 178 and the needle hub 174 of the needle assembly 176 to pass therethrough.
  • the tapered shield section 216 and the reduced diameter distal shield section 218 allow the dentist to observe the entire distal needle section 178 of the needle assembly 176 during a dental procedure and does not interfere with any other instruments which may be simultaneously present in the patient's mouth. Additionally, the use of the tapered shield section 216 and the smaller sized needle aperture 211 reduces the likelihood that a child or person with small fingers may accidentally contact the distal needle point 179 when the needle shield assembly 210 is in the extended position as
  • the needle sheath assembly 220 is adapted to be removably attached to the distal shield section 218 of the needle shield assembly 210.
  • the needle sheath assembly 220 includes an elongate and tubular body section 221 which is adapted to protect the distal needle section 178 and distal needle point 179 of the needle assembly 176 prior to ' use of the present embodiment.
  • the proximal end of the needle sheath assembly 220 includes an enlarged rim member 223.
  • the proximal end of the needle sheath assembly is adapted to be attached to the distal section 218 of the needle shield assembly 210 by frictional contact, adhesives or heat staking therebetween.
  • SUBSTETUTE SHEET Assembly of the dental syringe 150 is relatively simple and may be automated.
  • the collar assembly 186 is positioned within the proximal shield section 214 of the needle shield assembly 210 by inserting the collar assembly 186 through the distal end of the proximal shield section 214 so that the triangularly-shaped distal ends of the keys 198 are position between the triangularly-shaped protrusions 188 and in the appropriate keyways 190 on the collar assembly 186.
  • the tapered shield section 216 and integral distal shield section 218 are then placed on the distal end of the proximal shield section 214 so that the tapered shield section 216 is retained on the distal end of the proximal shield section 214.
  • the rim member 223 of the needle sheath assembly 220 is then attached to the distal shield section 218 of the needle shield assembly 210.
  • the needle assembly 176 is separate from the distal barrel section 172, the needle hub 174 of the needle assembly 176 is attached to the distal barrel section 172, as described above, and then the needle sheath assembly 220 is attached to the distal shield section 218. It is also contemplated that the other assembly methods described above with respect to the preferred embodiment
  • SUB ST ITUTE SHEET are readily adaptable for the assembly of the dental syringe 150 of the present embodiment.
  • the dental syringe 150 of the present embodiment may be used in a conventional manner to perform various dental procedures. Initially, the user may insert a medication cartridge 167 into the proximal end of the cartridge holder assembly 166. The plunger rod 154 of the injector assembly 152 is then moved proximally to a retracted position and the injector assembly 152 is attached to the cartridge holder assembly 166 by inserting the retention flanges 169 of the cartridge holder assembly 166 into the recesses 163 located in channels 165 of the injector assembly 152.
  • the user may then lock the injector assembly 152 on the proximal end of the cartridge holder assembly 166 by moving the locking ring 162 distally along the body member 164 to compress the frustoconically-shaped distal portion 161 of the body member 164 to retain the retention flanges 169 of the cartridge holder assembly 166 within the recesses 163 in the channels 165 of the body member 164.
  • the user may then grasp the finger ring 156 on the injector assembly 152 and move the plunger rod 154 distally until the barb member 158 pierces and is seated in the plunger member 171 on proximal end of the medication cartridge 167 and the proximal needle point 181 pierces the diaphragm 175 through the orifice in the metal cap 173 on the distal end of the medication cartridge 167.
  • the medication cartridge 167 is loaded in the cartridge holder assembly 166 and the needle shield assembly 210 is in the retracted position.
  • the needle shield assembly 210 is positioned about the cartridge holder assembly 166 so that the proximal end of the proximal shield section 214 is adjacent to the lip 164A of the body member 164 on the injector assembly 152; the needle aperture 211 on of the distal shield section 218 is adjacent to the needle hub 174
  • SUBSTITUTESHEET of the needle assembly 176 and the needle sheath assembly 220 encloses the distal needle section 178 and distal needle point 179 of the needle assembly 176.
  • the triangularly-shaped distal ends of the keys 198 are positioned in the keyways 190 between the side surfaces 192 of the protrusions 188 and in contact with the proximal edge of the spherical detents 208 on the collar assembly 186.
  • the detents 200 on the needle shield 210 are aligned within the slots 194 on the protrusions 188 so that the proximal surface of the detents % 200 will contact the sloped distal surface 194A of the slots 194 to releasably retain the needle shield assembly 210 in the retracted position.
  • the needle sheath assembly 220 is initially removed from the distal shield section 218 to expose the distal needle point 179 of the needle assembly 176.
  • the user may then administer the injection in a conventional manner by inserting the distal needle point 179 into the injection site while grasping the finger flange 160 and moving the finger ring 156 on the plunger rod 154 distally with respect to the finger flange 160.
  • the distal movement of the plunger rod 154 causes the barb member 158 to move the plunger member 171 distally in the cylinder 165 of the medication cartridge 167 and dispense the medication through the distal needle point 179 on the needle assembly 176 and into the injection site.
  • the needle shield assembly 210 • is pushed distally to the extended position as shown in Figures 1 and 3.
  • the keys 198 will slide longitudinally in the keyways 190 over the spherical detents 208 on the collar assembly 186 and the angled distal surfaces on the detents 200 on the needle shield assembly 210 will slide over the angled detenting surfaces
  • the proximal end of the keys 198 are positioned adjacent to the proximal side of the keyways 190 and the flat-proximal ends of the keys 198 are located along the distal edge of the spherical detents 208 and adjacent to the walls, 202 and 204 and locking slots 206.
  • the user may rotate the needle shield assembly 210 clockwise or counterclockwise about the cartridge holder assembly 166 and the collar assembly 186. Rotation of the needle shield assembly 210 will cause the keys 198 on the needle shield assembly 210 to move over the ramp shaped surface of the
  • the needle shield assembly 210 may be desirable to move the needle shield assembly 210 to the extended position ( Figure 5) without having the needle shield assembly 210 in a locked and extended position ( Figure 6) .
  • a dental syringe 150 is preloaded with the medication cartridge 167 at a location remote from the patient; stored on a dental tray prior to use or if the user desires to verify that the medication cartridge 167 is properly seated in the cartridge holder assembly 166, it may be preferable to extend the needle shield assembly 210 beyond the distal needle point 179 so that the needle shield assembly 210 functions as a temporary protective element prior to the actual use of the dental syringe 150.
  • the dental syringe 150 is facilitated by the spherical detents 208 on the collar assembly 186.
  • these spherical detents 208 are located in each of the keyways 190 between the protrusions 188 so that when the needle shield assembly 210 is pushed to the extended position, the flat-proximal end of each of the keys 198 will release from the spherical detents 208 and the end rim 222 of the needle shield assembly 210 will contact the proximal end of the collar 186.
  • the spherical detents 208 prevent the needle shield assembly 210 from being
  • the needle shield assembly 210 may be moved distally to the extended position and then rotated so that the keys 198 fall into the locking slots 206 to lock the needle shield assembly 210 in the locked and extended position as described above.
  • the present invention provides a safety dental syringe which allows a medication cartridge to be inserted into the dental syringe through the proximal end thereof.
  • the reduced diameter distal end of the present invention allows the user to observe the distal end of the needle during a dental procedure and does not interfere with any other instruments which may be present in the patient's mouth.
  • the relatively small size of the needle aperture in the distal end of the needle shield also prevents accidental contact with the distal needle point when the needle shield is in the extended position.
  • the cylindrical shape of the distal end of the needle shield allows the user to move the needle shield to the extended position to verify that the medication cartridge is properly seated in the cartridge holder without removing the needle sheath.

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

Abstract

Seringue (150) contenant un médicament et comprenant un premier (166) et un second (210) éléments tubulaires, un ensemble à piston (154), un ensemble à aiguille distale (176), et un élément embout (186). Le premier élément tubulaire (166) comporte des extrémités distale et proximale et reçoit un élément coulissant (171) adapté pour maintenir éloignée dudit élément tubulaire une dose de médicament préalablement introduite. L'ensemble à piston comprend un piston alternatif (154) apte à entrer en contact avec l'élément coulissant (171) à travers l'extrémité proximale du premier élément tubulaire (166). L'ensemble à aiguille (176) comporte des extrémités distale et proximale et porte un manchon d'aiguille (174) monté à côté de l'extrémité distale dudit premier élément tubulaire (166). Ledit ensemble à aiguille (176) comprend également au niveau de son extrémité distale une pointe distale (179) tandis que son extrémité proximale est adaptée pour se trouver en communication fluidique avec le médicament maintenu éloigné de l'élément coulissant (171). Ledit embout (186) est relié à l'extrémité distale du premier élément tubulaire (166) et le second élément tubulaire (210) est placé autour du premier élément tubulaire (166) et de l'embout (186). Le second élément tubulaire (210) comporte des extrémités distale et proximale et est conçu de telle sorte qu'il coulisse pour venir toucher l'embout (186) en se déplaçant dans le sens longitudinal sur le premier élément tubulaire (166) et sur l'embout (186), et entre une position rentrée dans laquelle la pointe (179) distale de l'aiguille est à nu, et une position sortie dans laquelle ladite pointe (179) est protégée. Le second élément tubulaire (210) comporte également une section conique (216) au niveau de son extrémité distale et le diamètre externe de l'extrémité distale de la section conique (216) est sensiblement inférieur à celui de l'extrémité proximale du second élément tubulaire (210). Lorsque le second élément tubulaire (210) se trouve dans sa position rentrée, son extrémité distale se trouve à côté du manchon d'aiguille (174) et de l'extrémité distale du premier élément tubulaire (166).
PCT/US1991/002579 1991-04-15 1991-04-15 Ensemble seringue/fourreau pour aiguille WO1992018183A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002085371A CA2085371C (fr) 1991-04-15 1991-04-15 Protection combinee pour seringue et aiguille
PCT/US1991/002579 WO1992018183A1 (fr) 1991-04-15 1991-04-15 Ensemble seringue/fourreau pour aiguille

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002085371A CA2085371C (fr) 1991-04-15 1991-04-15 Protection combinee pour seringue et aiguille
PCT/US1991/002579 WO1992018183A1 (fr) 1991-04-15 1991-04-15 Ensemble seringue/fourreau pour aiguille

Publications (1)

Publication Number Publication Date
WO1992018183A1 true WO1992018183A1 (fr) 1992-10-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/002579 WO1992018183A1 (fr) 1991-04-15 1991-04-15 Ensemble seringue/fourreau pour aiguille

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698546A1 (fr) * 1992-11-27 1994-06-03 Laffont Jean Michel Seringue d'injection.
EP0713404A1 (fr) * 1993-08-09 1996-05-29 Safety Syringes, Inc. Seringue aspirante jetable autoprotecion
EP0734270A1 (fr) * 1993-12-14 1996-10-02 U.S. Medical Instruments, Inc. Seringue retractable a corps de pompe ferme
EP0740942A1 (fr) * 1995-05-04 1996-11-06 Sanofi Procédé de fabrication d'un dispositif d'injection du type prérempli et dispositif d'injection réalisé
AU699570B2 (en) * 1994-04-04 1998-12-10 Clarence J. Thompson Shielding device for a syringe needle
WO2003041766A2 (fr) * 2001-11-14 2003-05-22 Sherwood Services Ag Appareil a aiguille de surete
DE10254195A1 (de) * 2002-11-20 2004-06-09 Pajunk Ohg Besitzverwaltung Ampullenhalter

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN110115591B (zh) * 2012-03-08 2022-11-29 贝克顿·迪金森公司 针组件

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EP0331452A2 (fr) * 1988-03-01 1989-09-06 Ryan Medical Inc. Dispositif médical avec protection d'aiguille
EP0350186A1 (fr) * 1988-06-28 1990-01-10 Sherwood Medical Company Seringue reliée à un manchon d'aiguille et méthode de fabrication
WO1990004984A1 (fr) * 1988-10-31 1990-05-17 Allan Jay Coplin Protection contre des piqures accidentelles par des aiguilles a usage medical
US4961730A (en) * 1989-09-29 1990-10-09 Poncy George W Hypodermic syringe with sliding cap
EP0394537A1 (fr) * 1987-03-17 1990-10-31 McNaughton, Roy D. Seringue hypodermique

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
EP0394537A1 (fr) * 1987-03-17 1990-10-31 McNaughton, Roy D. Seringue hypodermique
EP0331452A2 (fr) * 1988-03-01 1989-09-06 Ryan Medical Inc. Dispositif médical avec protection d'aiguille
EP0350186A1 (fr) * 1988-06-28 1990-01-10 Sherwood Medical Company Seringue reliée à un manchon d'aiguille et méthode de fabrication
WO1990004984A1 (fr) * 1988-10-31 1990-05-17 Allan Jay Coplin Protection contre des piqures accidentelles par des aiguilles a usage medical
US4961730A (en) * 1989-09-29 1990-10-09 Poncy George W Hypodermic syringe with sliding cap

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698546A1 (fr) * 1992-11-27 1994-06-03 Laffont Jean Michel Seringue d'injection.
EP0713404A1 (fr) * 1993-08-09 1996-05-29 Safety Syringes, Inc. Seringue aspirante jetable autoprotecion
EP0713404A4 (fr) * 1993-08-09 1997-07-09 Safety Syringes Inc Seringue aspirante jetable autoprotecion
EP0734270A4 (fr) * 1993-12-14 1997-08-13 Us Medical Instr Inc Seringue retractable a corps de pompe ferme
EP0734270A1 (fr) * 1993-12-14 1996-10-02 U.S. Medical Instruments, Inc. Seringue retractable a corps de pompe ferme
AU699570B2 (en) * 1994-04-04 1998-12-10 Clarence J. Thompson Shielding device for a syringe needle
EP0740942A1 (fr) * 1995-05-04 1996-11-06 Sanofi Procédé de fabrication d'un dispositif d'injection du type prérempli et dispositif d'injection réalisé
FR2733687A1 (fr) * 1995-05-04 1996-11-08 Brunel Marc Procede de fabrication d'un dispositif d'injection du type pre-rempli renfermant une dose de liquide a injecter, et dispositif d'injection realise
US5855839A (en) * 1995-05-04 1999-01-05 Sanofi (S.A.) Process for manufacturing an injection device of the pre-filled type containing a dose of liquid for injection and injection device produced
WO2003041766A2 (fr) * 2001-11-14 2003-05-22 Sherwood Services Ag Appareil a aiguille de surete
WO2003041766A3 (fr) * 2001-11-14 2003-09-12 Sherwood Serv Ag Appareil a aiguille de surete
US6945958B2 (en) 2001-11-14 2005-09-20 Sherwood Services Ag Safety needle apparatus
DE10254195A1 (de) * 2002-11-20 2004-06-09 Pajunk Ohg Besitzverwaltung Ampullenhalter

Also Published As

Publication number Publication date
CA2085371C (fr) 1998-11-17
CA2085371A1 (fr) 1992-10-16

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