Abstract: An inner tubular assembly positioned in telescoping arrangement with an outer tubular protective assembly forms a chamber for a fluid receptacle in a hypodermic syringe; it supports a hypodermic needle and a piston plunger to inject fluid from or draw fluid into the receptacle. Biasing means acting between the inner and outer assemblies urge the inner assembly including the outer end of the needle to a retracted position. Levers in the form of finger pieces are pivotally mounted on the outer assembly; the levers are biased to urge the lugs formed at their ends through apertures in the outer assembly and into engagement with a shoulder at the lower end of the inner assembly to latch it in retracted position. When the finger pieces are grasped to use the syringe the latch is actuated to released position. Other lugs at the upper portion of the finger pieces aaaare engageable with a shoulder on the upper portion of the inner tubular assembly to retain the needle in exposed position ready for injection.

Abstract: This invention relates to a safety dental syringe which before and after use protects the needle from exposure. More particularly, this invention pertains to a safety sleeve for a conventional dental syringe wherein after the syringe is used, an overlying sleeve surrounding the barrel of the syringe is extended so that the exposed used needle of the syringe is shielded by the sleeve. The invention pertains to a needle and sleeve assembly useful for use in association with a dental syringe comprising a hollow barrel, a piston, and an anaesthetic ampule cavity therein, comprising: a hollow elongated sleeve having openings at each end thereof; and a hollow housing base which supports at one end thereof an injection needle, and at the other end thereof, an ampule penetrating needle, the exterior of the housing base being adapted to slidably engage with the hollow interior of the sleeve.

Abstract: A safety dental syringe of the type adapted to receive a medication cartridge therein but having a protective needle shield thereon which is movable between a retracted position wherein the needle is exposed and a locked and extended position wherein the needle is protected and the needle shield is prevented from returning to the retracted position. A collar is attached to the distal end of the dental syringe to selectively engage a key on the needle shield as the needle shield is moved between the retracted and extended positions. The needle shield slides longitudinally between the retracted and extended positions and may be rotated about the barrel of the dental syringe to lock the needle shield in the locked and extended position. A locking mechanism is disclosed which preferably includes a series of ramps and slots adapted to engage portions of the keys on the needle shield to retain the needle shield in the locked and extended position.

Abstract: A syringe comprises a barrel with a reciprocable piston having a liquid passage between the piston ends. The outer piston end is connectable to a needle, and an open ended tubular sheath having a needle and a handle end, and being slidable over the barrel, and attachable to the piston, to extend around the barrel when the piston is toward the handle end of the barrel. The piston is selectively detachable from the sheath, and is movable, after such detachment and with retraction of the barrel from the sheath, to selectively draw a needle means attached to the piston into the sheath.

Abstract: A simple and versatile system for the safe transfer and collection of body fluids, such as blood, wherein an enlarged generally cup-shaped guide port receives therewithin the transfer needle which is recessed rearwardly from the open end of the guide port whereby the transfer needle assembly may be manipulated without likelihood of needlestick injury to the health care worker. Larger Guide ports have apertured caps to facilitate and guide a transfer receiver into contact with the needle as well as to isolate further the worker's hand from the contaminated needle. A plurality of sizes of guide ports are provided for varying fluid receivers, with all having common interlocking means for the transfer needle assembly.

Abstract: An injector for delivering fluid to a preselected internal target tissue while avoiding fluid exposure to surface tissue. A needle housing assembly is concealed within a cartridge having a puncturable end cap and an ampule is also disposed within the cartridge separate from the needle housing assembly. The cartridge has a cylindrical bore which widens at one end such that the needle housing assembly which has walls while located within the narrower portion of the cylindrical bore prevents the ampule from being punctured by a hollow injection needle supported by the needle housing assembly. When the ampule is propelled toward the needle housing assembly with a plunger, the needle housing assembly enters the widened portion of the cylindrical bore, allowing its walls to be separated such that the hollow injection needle extends into the ampule allowing the fluid to be delivered from the ampule through the hollow injection needle to the internal target tissue.

Abstract: A syringe comprising a barrel having a needle extending from a needle end of the barrel, a plunger and a protective sleeve. There is a groove in the inner surface of the sleeve and a key extending from the outer surface of the barrel into the groove. The groove has a longitudinal section and a circumferential section. The circumferential section has opposing and offset zig-zag edges. A spring biases the barrel toward the protective sleeve. By pressing the plunger against the force of the spring, the key moves in the groove, sliding along the zig-zag edges. The design of the groove cooperates with the operation of the syringe and can cause the key to move into the longitudinal groove and the needle to thereby retract into the protective sleeve after the plunger is depressed.

Abstract: A needle guard and a method to prevent needle stick injuries are disclosed, for use with a hypodermic syringe or other instrument with a sharp point. The needle guard, comprises a protective sleeve with a fitting, that may be used with or added to a syringe and needle assembly. The interior of the fitting contains an annular core adapted to permanently engage the fitting on the syringe barrel. Radial arms extending from the core align and cooperate with the slidable sleeve. Prior to and during use of the needle, the sleeve remains in a retracted position covering the barrel of the syringe. After the needle has been used, the sleeve is pushed forward into its locked extended position, so that the end of the sleeve extends beyond the tip of the needle. The tip of the needle is thereby shielded, preventing accidental sticks.

Abstract: A safety dental syringe of the type adapted to receive a medication cartridge therein but having a protective needle shield thereon which is movable between a retracted position wherein the needle is exposed and a locked and extended position wherein the needle is protected and the needle shield is prevented from returning to the retracted position. A collar is attached to the distal end of the dental syringe to selectively engage a key on the needle shield as the needle shield is moved between the retracted and extended positions. The needle shield slides longitudinally between the retracted and extended positions and may be rotated about the barrel of the dental syringe to lock the needle shield in the locked and extended position. A locking mechanism is disclosed which preferably includes a series of ramps and slots adapted to engage portions of the keys on the needle shield to retain the needle shield in the locked and extended position.

Abstract: A needle shield and syringe assembly are provided. The main components of the needle shield are a hollow sleeve, a needle shielding means, and a snap ring. Radially extending protrusions are provided on the hollow sleeve, which slide within longitudinally extending slots in the needle shielding means allowing extension and retraction of the needle shielding means. The snap ring is positioned within a groove in the hollow sleeve at retraction, and extends into a groove in the needle shielding means at extension. Extension of the snap ring into the groove in the needle shielding means locks the shield in the extended position over the syringe needle.

Abstract: A unit dose syringe comprises a fluid-containing plastic bag with an attached needle and a dimensionally-stable shell like a woman's compact. The shell contains a thumb-operated slider assembly for advancing the needle to an exposed position for fluid delivery. The syringe also includes a spring-biasing arrangement to return the needle, automatically, to the protected position, after use, and a means for rupturing the bag and retaining the needle in the protected position.

Abstract: A medical syringe having a disposable capsule, or capsule, containing the needle and the injection fluid, the syringe including a barrel assembly having a thumb ring attached to a plunger by a plurality of connecting rods, the plunger working like a piston inside a barrel having finger grips to cooperate with the thumb ring and a central locking rod to connect to a disposable shielded needle capsule, the capsule including a space for holding the supply of injection fluid and a movable piston at the top of that space for contact with the plunger, and a central tubular guide as a sheath for a hollow needle having a needle plug which is attachable to the locking rod and two spaced gaskets around the needle and positioned on each side of a passageway through the wall to be in alignment with a passageway through the tubular guide to allow the fluid to flow into the hollow of the needle.

Abstract: A hypodermic syringe includes an elongate housing having rear and forward ends and a piston chamber which slidably supports the piston to define an innoculant storage space within the housing, a hollow needle supported by the plunger assembly and in communication with the storage space. The needle is extendable from the forward end of the housing and retractable into the housing during an injection stroke and a safety device is provided for preventing re-use of the syringe after completion of the injection stroke. The safety device includes an override chamber at the rear end of the housing and adjoining the piston chamber, the override chamber having a greater width than the piston chamber, and a displaceable diaphragm located at or adjacent the juncture of the piston and the override chambers to partition and seal the override chamber from the piston chamber, the diaphragm being displaced by the piston and the piston entering the override chamber at the end of the injection stroke.

Abstract: An insert (14) for supporting a double ended needle (94, 98) during a blood collection procedure is translatably mounted with a cylinder (12) for retracting the anterior needle (98) into the cylinder (12) on completion of the procedure to prevent needle stick while the posterior needle (94) remains continually shielded against needle stick by the insert (14). An anterior lock position stabilizes the double ended needle (94, 98) during the blood collection procedure and a posterior lock position retains both ends (94, 98) of the needle shielded. Ramps (130, 132) may be associated with the posterior lock position to prevent further translation of the insert (14) and reuse of the holder (10). For a reusable holder embodiment, the used double ended needle (94, 98) is retracted, safely enclosed and locked inside the cylinder (12).

Abstract: A single use syringe comprises a separable, reusable handle including a piston (6) and a support part (2, 3) for a sleeve (4) having an interlocking structure (5) through which the piston (6) extends. The syringe body (11) has a tubular end (16) with an interlocking structure cooperating with that of the sleeve (4) of the handle (1) and the shape of which is adapted to interlock with said sleeve, and a protecting shell (12) having a locking section (22) capable of covering the tubular end (16) and the sleeve (4) so that they are locked in their interlocking position, said protective shell (12) being adapted for sliding along the syringe body (11) between two extreme positions, i.e. a forward position where it totally covers the injection needle and a pulled back position where it frees it and covers the interlocked tubular end (16) and sleeve (4).

Abstract: A protective device for use with a hypodermic syringe for preventing accidental needle sticks after fluid has been ejected from the syringe and rendering the syringe non-reuseable. The protective device comprises a hollow, cylindrical casing defining a forward end wall having an opening therein, a rearward open end and an angular gripping flange adjacent the rearward end. The casing is adapted to be disposed about the syringe such that the syringe is reciprocally translatable therein with the syringe needle projecting through the opening in the forward end wall of the casing and the angular gripping flange axially spaced from the syringe flange. A dual component foaming agent is disposed in the casing adjacent the forward end wall thereof which, when the components thereof are mixed together activate to form an expanding and hardening plastic foam.

Abstract: Syringes using pre-loaded cartridges for injecting fluid medications can be made safer for users and patients, more compliant with modern infection-control precautions, and easier to operate by supplying thumb-ring activated, breech-loading syrettes with screw-on plungers for aspirating into and emptying transparent cartridges with permanently attached needles. The cartridges can be made with trailing terminal circular flanges with gaps for stabilizing the cartridge in the syrette breech chambers closed by hinging breech blocks; permanently attached leading needles whose exposed tips are kept sterile before use by thin disposable elastomeric scabbards; and whose trailing ends optimize visualization of flashback.

Abstract: A needle guard for a syringe or other injection instrument with a sharp point is disclosed having a protective sleeve with a needle base, and having a retracted position and an irreversible extended position that may be used with a conventional syringe assembly. The needle guard being comprised of a needle base containing a hypodermic needle integral therewith and locking means, and a protective sleeve slidable on the needle base. Prior to and during use of the needle, the sleeve remains in a retracted position covering the barrel of the syringe. After the needle has been used, the sleeve is pushed forward into its locked extended position, so that the end of the sleeve extends beyond the tip of the needle. The tip of the needle is thereby shielded, preventing accidental sticks.

Abstract: An insert for supporting a double ended needle during a blood collection procedure is translatably mounted within a cylinder for retracting the anterior needle into the cylinder on completion of the procedure to prevent needle stick while the posterior needle remains continually shielded against needle stick by the insert. An anterior lock position stabilizes the double ended needle during the blood collection procedure and a posterior lock position retains both ends of the needle shielded. A ramp may be associated with the posterior lock position to prevent further translation of the insert and reuse of the holder. For a reusable holder embodiment, the used double ended needle is retracted, safely enclosed and locked inside the cylinder. The anterior end of the cylinder is adapted for receiving the open end of a conventional needle shield to permit gripping of the needle supporting hub and disengagement of the needle from the insert without exposure to needle stick.

Abstract: A safety device for an injection syringe comprising an outer casing (1) defining an injection fluid space with a plunger (11) movable therein, said plunger being adapted to be coupled with a plunger rod (6) provided with an actuating knob or ring, while at the opposite end of said casing a needle foot (16) equipped with a hollow needle (15) may be fixed thereto in such a manner that the needle bore communicates with the interior of the fluid space, the needle foot (16) being movable inwards relative to the outer casing and adapted to be coupled to the piston in order that the needle may be retracted into said outer casing; the needle foot (16) and the casing (1) are provided with mutually engageable locking means for locking the needle foot (16) in its non-retracted position, and the plunger (11) or the plunger rod (6) and the needle (15) or the needle foot (16) are provided with means for coupling the plunger (11) or plunger rod (6) with the needle (15) or needle foot (16) and releasing the needle or needle

Abstract: A reusable dental syringe including a conventional medication filled carpule and a conventional double-ended needle cannula which is to be retracted into a compact enclosure to permit the safe handling and disposal of the cannula while avoiding an accidental needle stick and the possible spread of disease. The carpule is inserted into a hollow carpule adapter to engage a movable needle carrier at the distal end of the adapter. The combination carpule and adapter are loaded into the cylinder of the syringe, and the needle cannula is attached to the needle carrier to penetrate the carpule. At the conclusion of an injection, the combination carpule and carpule adapter are rotated outwardly from the syringe cylinder, and the carpule is then pulled rearwardly through the adapter, whereby to correspondingly relocate and anchor the movable needle carrier at the proximal end of the adapter.

Abstract: A needle receptacle that includes a sheath with a cradle portion and attached barrel end and may include top and end covers as a syringe and needle housing. The cradle portion is open along its top portion and includes parallel spaced apart finger protective flanges at opposite sides of a finger grasping portion formed therearound. The barrel end is tapered into a needle receiving portion and includes a flared connection between the cradle and the barrel end to serve as a guide for needles inserted into the barrel, which barrel also includes a detent extending radially therein for preventing needle turning.

Abstract: A needle guard for a syringe or other instrument with a sharp point is disclosed having a protective sleeve with a fitting, and having a retracted position and a locked extended position, that may be used with or added to a conventional syringe and needle assembly. Prior to and during use of the needle, the sleeve remains in a retracted position covering the barrel of the syringe. After the needle has been used, the sleeve is pushed forward into its locked extended position, so that the end of the sleeve extends beyond the tip of the needle. The tip of the needle is thereby shielded, preventing accidental sticks.

Abstract: A holder for a syringe to protect the user after administering an injection. The holder has a housing with an open end to receive the syringe barrel so that the needle projects beyond the other end of the housing for use. A spring retracts the needle after use, and a clip can be used to secure the syringe in its retracted position. The holder housing has means for releasably securing the syringe in a second position that provides for use of the syringe while in the holder.

Abstract: An improved safety syringe is disclosed herein comprising a locating ring positioned on the distal end of a syringe barrel and a pair of first and second sleeves which interact with a projecting tab on the locating ring to movably retain the first sleeve in retracted and extended positions and wherein in the extended position one of the sleeves enclose the syringe needle in an irreversible locked arrangement.

Abstract: Retractable needle/syringe devices for blood collection, catheterization, and medicinal injection procedures adapted to fixedly project the needle from a device housing to perform the procedure, and, after the procedure is completed, retract the needle back into the housing for disposal, substantially without risk of persons handling these devices coming into contaminating contact with a used needle or syringe. One embodiment of the device including a needle/syringe assembly spring biased in a first position within a housing. A push button locking mechanism disposed through the top of the housing in abutting alignment with the syringe barrel is operated to forwardly translate the syringe to a second position and lock it in place so as to fixedly project the needle from the housing.

Abstract: An injection device which is devised to be safer in use than many prior such devices comprises a generally cylindrical barrel section which is substantially closed at its first end but has an aperture in that end to allow an injection needle to pass through it, a needle support member to slide within the barrel section and shaped to receive one end of a liquid container such as an ampoule of anaesthetic, and a plunger mounted at the other end of the barrel section for axial movement in said section. The plunger is adapted both to express liquid from the liquid container when the plunger is advanced within the barrel and also to interconnect with either the needle support member or the liquid container, whereby withdrawal of the plunger withdraws both the liquid container and also the needle and its support member into the barrel section for disposal.

Abstract: The invention relates to a device for the injection of implants, preferably implants "in the form of small rods" (called rods), which are used for the long-term treatment of diseases, whose essential features are the completely transparent construction, especially of the injector body (3), as well as a protecting device which prevents the plunger rod from falling out, and a protective cap (6) for the plunger rod.

Abstract: A reusable dental syringe including a conventional medication filled carpule and a conventional double ended needle cannula which is to be retracted into a compact enclosure to permit the safe handling and disposal of the cannula while avoiding an accidental needle stick and the possible spread of disease. The carpule is inserted into a hollow carpule adapter to engage a movable needle carrier at the distal end of the adapter. The combination carpule and adapter are loaded into the cylinder of the syringe, and the needle cannula is attached to the needle carrier to penetrate the carpule. At the conclusion of an injection, the combination carpule and carpule adapter are rotated outwardly from the syringe cylinder, and the carpule is then pulled rearwardly through the adapter, whereby to correspondingly relocate and anchor the movable needle carrier at the proximal end of the adapter.

Abstract: The present invention provides an intravenous catheter apparatus having a retractable stylet, comprising a cannula member positioned at the end of a catheter, affixed to an end portion of a stylet body and engaged to an end portion of a tubular stylet protector chamber. The stylet protector chamber includes a stylet body plunger member having a stylet body and stylet on the distal end thereof, the stylet insertable in the bore of the cannula, and extending past the distal end of the cannula when the stylet is in the full extended position.

Abstract: A container and needle assembly includes a container body portion having a proximal end, a distal end and a side wall therebetween defining a chamber for retaining fluid and a tip portion extending from the distal end of the body portion having a passageway therethrough. A projection extends outwardly from the tip portion. A pierceable barrier is provided for preventing fluid communication between the chamber and the passageway. A hub having a forward end, a rearward end and a conduit therethrough is movably positioned within the passageway. A first cannula extends outwardly from the forward end of the hub and a second cannula extends outwardly from the rearward end of the hub. A needle shield movably engaging the tip, covers the first cannula. This needle shield has an outer extension portion extending over a portion of the tip which is capable of contacting the projection for limiting the motion of the needle shield toward the proximal end of the body portion.

Abstract: A combined percutaneous needle, stylet and needle guard. The guard has a friction fit with the distal end of the needle and stylet to retain the guard. When in use, the guard is transferred to the hub end of the needle to interfit with a proximal end of the needle and serve as a guide for a guidewire to be projected through the needle.

Abstract: One step manually activated injection apparatus capable of injecting multiple pre-measured doses of liquid medicaments without visibility of needle. It is composed of cylindrical housing unit with small aperture at bottom and removeable manual plunger unit at the top, and within housing unit there is a syringe unit composed of a piston, ampule with pre-measured liquid medicament, needle covered with sterile sheath and clip apparatus attached onto the ampule. The injection apparatus is placed in ready position by contacting the bottom of housing unit against a skin surface. One forward manual push on manual plunger unit performs two distinct functions. First, the manual plunger unit engages the clip apparatus attached to syringe ampule, permitting forward movement of syringe unit within housing unit, allowing needle to pierce sheath and pass externally through aperture of housing unit without visibility into the skin.

Abstract: A self-resheathing safety needle has a case with a small closed end and a large open end and a needle assembly within the case with the needle projecting through the small closed end. A hub is connected to the needle assembly inside the case and a connector on the hub cooperates with a receiver in the small end to hold the needle assembly in the case. A flange on the hub cooperates with an inward projection in the case spaced from the small end to prevent movement of the needle out of the case when the needle is withdrawn from the opening in the small end. The nozzle of a syringe pushed into the hub withdraws the needle when the syringe is withdrawn. A rubber stopper on a vacuum tube withdraws the needle after the rubber stopper turns the flange to release the connector from the receiver.

Abstract: The case is constituted by a hollow tubular member which fits tightly on the outer face of the body. One end of this member is closed off by a solid wall. The length of the case is such that when the body is introduced into the latter, the tip for fixing the syringe on a gripping tool remains exposed. The needle which project outside the body is protected in an air tight manner inside the case, without contact with the inner faces of the latter. The case is provided internally with an abutment which limits the penetration of the syringe body into the case so that the needle does not reach the closing wall. Parts in relief of identical thickness distributed on the outer periphery of the case and on the open end of the cap ensure the locking of the cap on the case in an air-tight manner.

Abstract: A shield protector device for use with artificial insemination instruments and/or culture collection devices, consisting of an inner tubular portion movable relative to an outer tubular sheath protector portion, includes a cylindrical housing having a closed end, which is sealingly attached to the distal end of the outer tubular sheath protector portion. The closed end of the housing is scored to provide a break-away membrane when the closed end of the shield protector is engaged by the inner tubular portion to complete the insemination or culture collection process.

Abstract: A disposable plastic container-applicator usable as a douche having an integrally formed catheter and a container portion with a cover member enclosing the catheter. The cover member is sealed to the catheter both at a constricted portion and at a skirt portion to prevent the escape of fluid from the catheter into the surrounding atmosphere. A groove on the neck of the catheter engages a ridge on the skirt portion to form a seal. The inside diameter of the tip of the cover member is greater than the outside diameter of the catheter so as to form a cavity. To open a slit in the rounded end of the catheter for the passage of fluid, the user pinches the tip to cause the air of the cavity to pass through the slit.