Abstract: A safety needle assembly is provided herein having a hub; a needle fixed to the hub; a shield; a tab; a spring disposed between the shield and the hub configured to bias the shield distally; and, a clip disposed between the hub and the shield, the clip having a notch formed thereon shaped to permit passage therethrough of the tab. The clip and the tab releasably retain the shield in a first locked state against the biasing force of the spring thereby limiting distal movement of the shield relative to the hub; yet, in the first locked state, the shield is movable proximally relative to the hub. In the first locked state, the notch is spaced from the tab. The clip and the tab are relatively displaceable so as to align the notch with the tab and release the shield from the first locked state thereby allowing the shield to move distally, relative to the hub, to a second shielded state. In the second shielded state, the distal end of the needle is covered by the shield.

Abstract: An infusion pump system is described that increases patient comfort and convenience. The infusion pump system includes an infusion site interface that is releasably connected to an infusion pump body, and has no tubing associated between the infusion site interface and the pump body. The infusion pump body may include a carrier frame that may be adhered to the skin of a user.

Abstract: A medicament delivery device has an elongated housing; a medicament container carrier for a medicament container to which a medicament delivery member is attached, the carrier being slidable in the housing; a trigger unit; a cover unit coaxial and slidable in the housing; a release mechanism adapted to be actuated partly by the trigger unit and partly by movement of the cover unit; a preloaded drive unit releasably connected to the carrier and controlled by the release mechanism for advancing the carrier to a predetermined proximal position in relation to the housing at which the drive unit becomes disconnected from the carrier for advancing a slidable stopper in the container and thereby dispensing the medicament; and a braking mechanism acting between the preloaded drive unit and the release mechanism for controlling the speed of the preloaded drive unit when advancing the slidable stopper in the container.

Abstract: A needle shroud assembly for a syringe holder comprises a barrel (16), a needle shroud (24) captively telescoped relative to the forward end of the barrel (16) and retained by a top outer body (44). A locking ring (42) cooperates with the shroud, having diametrically opposed keyways which are brought into and out of axial alignment with keys (38) on the shroud (24) to free or lock the shroud from movement. The locking collar (42) is biased towards a ‘safe’ position. On cocking the locking ring (42) to a ‘live’ position the shroud (24) is freed for retraction movement but on return to its extended position, the locking ring is returned to its ‘safe’ position.

Abstract: A safety needle accessory includes a hub (6) having a connector (2) for surrounding a hollow needle. The hub has a first seal (10) that engages sealingly with the connector. A slidable sleeve (8) slides over the needle in a first longitudinal direction from a first position in which the needle is fully or partially covered by the sleeve to a second position in which the needle is exposed to a third position in the second direction in which the needle is fully covered by the sleeve. A pack (9) having a closed end surrounds the hollow needle, hub and slidable sleeve. The pack has a first section which abuts the hub or the first seal to form a second seal and the pack has a second section which engages the needle tip to form a third seal (12) between the closed end of the pack and a needle tip.

Abstract: In one aspect, a medical device is provided which includes flexible tubing having a distal end and a proximal end and at least a first lumen extending from said distal end to said proximal end; a first needle cannula having proximal and distal ends, said first needle cannula being mounted at said distal end of said tubing and in fluid communication with said lumen; a second needle cannula mounted at said proximal end of said tubing and in fluid communication with said lumen; a shield disposed over said tubing, said shield extending substantially the entire length of said flexible tubing, and said shield being movable relative to said first needle cannula from an initial proximal position wherein said first needle cannula is exposed to a distal position wherein said distal end of said first needle cannula is covered by said shield; and an actuator for actuating the shield at a location spaced from the first needle cannula, preferably closer to the second needle cannula than to the first needle cannula.

Abstract: A needle tip protective device for use with percutaneous entry needles. In one embodiment, the needle tip protective device includes a needle guard slidably mounted on a hypodermic needle, the latter having a needle tip located at the distal end thereof, and a change of profile formed medially there along. The needle guard is movable along the hypodermic needle and engageable with the change in profile formed thereon. The engagement with the change in profile is configured to correspond with the ability of the needle trap to entrap the needle tip once the needle trap has advanced the sufficient distance distally along the hypodermic needle. In further refinements, the needle trap may be biased toward the distal needle tip of the needle.

Abstract: A syringe assembly includes a syringe barrel defining a chamber and having a stopper disposed within the chamber, a sleeve having a first end and a second end and extending at least partially about the syringe barrel, and a cap associated with a second end of the sleeve. The syringe assembly also includes a plunger rod having a first end associated with the cap and a second end, wherein the plunger rod is transitionable from a pre-use position, in which at least a portion of the second end of the plunger rod extends along a portion of a barrel sidewall, to a ready-to-use position in which the plunger rod is aligned with the stopper. Upon proximal movement of the sleeve in a direction away from a first end of the barrel, the plunger rod is configured for lateral movement with respect to the cap into the ready-to-use position.

Abstract: In an elongated casing, an active agent container connected to an injection needle can be shifted axially by a spring force. Auto-injectors which are sold or distributed filled and with the springs tensed have to be provided with a needle protecting cap to ensure the sterility of the injection needle. When such a needle protecting cap is removed as preparation for using the auto-injector, a tensile force can be exerted on the active agent container. Therefore, the active agent container comprising the injection needle must be prevented from being undesirably pulled forwards. At least one latching tongue prevents the active agent container from being prematurely shifted with respect to the casing, by abutting a flange arranged on a sliding sleeve which accommodates the active agent container. When the auto-injector is placed onto a person's skin, a needle protecting tube is shifted into the casing, forcing the latching tongue away from the flange and, thus, freeing the travel path for needle movement.

Abstract: A syringe includes a barrel having a mouth on one end portion, a needle having a nipple engaged in the mouth of the barrel, a plunger slidably engaged into the barrel, a piston releasably attached to the plunger and having a protrusion for engaging with a needle mounting, and a follower slidably engaged in the plunger and having a catch device for securing the piston to the follower, and a spring biasing member engaged with the follower for biasing and retracting the follower and the piston and the needle mounting and the needle into the barrel when the latch member of the latch device is disengaged from the needle mounting and for preventing the needle from being exposed after use.

Abstract: Systems, devices, and methods are provided for providing safe syringe assemblies for injections. The syringe assemblies include a shielding mechanism that covers a syringe needle after an injection is delivered, thereby reducing the risk of a subsequent accidental stab from the needle. The shielding mechanism has a pre-injection configuration in which the needle extends beyond the housing and a post-injection configuration in which at least one component of the syringe assembly covers the needle. In some implementations, the syringe assembly includes a lock that inhibits the assembly from returning to the pre-injection configuration once an injection is delivered. The syringe assemblies may also include a bevel orientation mechanism that allows a user to align a needle bevel to accurately insert a needle for injection.

Abstract: A method involving a syringe, a pre-filled cartridge, a needle, a guard, and a release mechanism is described. The method may involve inserting the cartridge into the syringe. In some versions, the method may involve releasing the guard to cover a portion of the needle. In some versions, the method may involve the release retaining the guard in a retracted position. In some versions, the release may be operable to be actuated to release the guard. In some versions, the guard may be extended and locked once extended to cover the needle.

Abstract: An injection device, in some embodiments an autoinjector, which includes a thrust spring that advances an injection needle from an initial position to an insertion position from the distal end of the injection device and that causes a product to be emptied from the product reservoir by an emptying movement, and a return spring that retracts the injection needle from the insertion position into the distal end of the injection device counter to the force of the thrust spring, wherein the return spring is decoupled from the thrust spring during the emptying movement.

Abstract: Puncturing device FIG. 6 with needle shield 2, having a needle subassembly 1 and a needle shield 2 detachably mounted on the needle subassembly 1 for enclosing the needle distal end 9 up to the device usage, wherein said needle shield 2 has an actuating means 17 which being moved to a retracted position disengages the needle shield 2 from the needle assembly 1, wherein the detaching movement of the actuating means 17 is significantly shorter than the length of the needle 8.

Abstract: The safety device for an injection syringe includes a syringe support, a protective sheath for protecting an injection needle carried by the syringe, the sheath being mounted to slide relative to the syringe support between an injection position in which the needle is uncovered, and a protection position in which the needle is covered, the sheath having a grip surface enabling the device to be gripped by a user and referred to as the initial grip surface, and a return spring for urging the sheath into the protection position. The sheath also includes an extender member for extending the initial grip surface and fitted on the sheath in such a manner as to present a larger grip surface, referred to as an enlarged grip surface.

Abstract: Needle assemblies are generally discussed herein with particular discussions extended to needle assemblies having a tip protector with a plurality of wall surfaces for preventing contact with the needle tip from a side. Aspects of the tip protectors discussed herein include a first protector body having an arm for blocking a needle tip surrounded by a second protector body having a plurality of wall surfaces.

Abstract: A device for selectively protecting a needle includes an adapter holding the needle and a guard engaging the adapter for relative movement therebetween. Further, the device includes a means for guiding movement between the adapter and the guard. Structurally, the guiding means includes a “V” shaped slot in the guard and a radially-extending boss on the adapter. The boss is received in the slot to limit relative movement between the guard and the adapter. Specifically, in a first position of the device, the boss is in a first leg of the slot and the needle partially extends beyond the guard. In a second position, the boss is held at the apex of the slot and the needle fully extends beyond the guard. In a third position, the boss is in the second leg of the slot and the needle is retracted into the guard to protect the needle.

Abstract: Disclosed is a safety needle assembly has a needle guard that prevents accidental needle sticks before and after an injection. A locking collar rotates during use as an inner protrusion follows three paths of a track located on the outer surface of a body housing. When the inner facing protrusion is in the third path, it encounters a hard stop and a rotational bias that locks the guard from further retraction and, thus, covers the sharp distal end of the needle.

Abstract: Protective devices for injection needles or infusion needles that include a needle holder at a proximal end of the needle, on whose shaft a protective element for the needle tip can be positioned and moved, are herein disclosed. The protective element is configured to block the needle tip following an injection to prevent accidental contact therewith. The protective element may be positioned on the shaft in a ready to use position inside a grip part or middle retaining portion, which is also used to activate the protective element over the needle following the injection.

Abstract: According to the invention, first and second locking means (16, 12) are conformed to engage with each other and to permit the locking of an activation means (4) in at least one intermediate position between first and second positions of the activation means (4). The first and second locking means (12, 16) are conformed to be disengaged from each other when the protection member (3) is in a first position, in which a movement of a vessel contained in the device (1) is possible from an initial position to a position for inserting a needle contained in the vessel, and to be engaged with each other when the protection member (3) leaves said first position.

Abstract: The present invention relates to a medicament delivery device comprising a drive means configured to act on a medicament container for expelling a medicament; a holding means configured to hold said drive means in a pre-tensioned state; an activation means configured to interact with said holding means for releasing said drive means from the pre-tensioned state; wherein the device further comprises feedback means configured to interact both with said holding means and with said drive means for generating an audible and/or tactile and/or visual signal indicating that the medicament has been completely expelled.

Abstract: A medicated module for an injection system to co-deliver at least two medicaments is disclosed where a primary delivery device containing a primary medicament accepts a medicated module containing a single dose of a secondary medicament and where both medicaments are delivered through a hollow needle. The medicated module is user selectable so that it will deliver a priming dose of a primary medicament or both the primary and secondary medicaments. The module also contains a needle guard that locks after dose delivery. The needle guard prevents accidental needle sticks before and after an injection. A locking collar rotates during use as an inner protrusion follows three paths of a track located on the outer surface of a body housing. When the inner facing protrusion is in the third path, it encounters a hard stop and a rotational bias that locks the guard from further refraction and thus covers the sharp distal end of the needle.

Abstract: The present invention provides an injection device including a syringe having a distal end for receiving a needle, and a plunger inserted into a proximal end. A guard is slidable on the syringe, has a proximal end, a distal end, and is biased from a first position wherein the needle is exposed toward a second position wherein the guard covers the needle. The syringe includes a body having a central cylindrical opening for receiving a medicine and the plunger, and further includes a pair of longitudinally extending members on opposite sides of the body. The injection device includes cooperating detents for retaining the guard and syringe in the first and second positions. A latch member is engageable by the plunger as the plunger is depressed to release the cooperating detents. Upon release, a spring element biases the guard toward the second position.

Abstract: An infusion pump system is described that increases patient comfort and convenience. The infusion pump system includes an infusion site interface that is releasably connected to an infusion pump body, and has no tubing associated between the infusion site interface and the pump body. The infusion pump body may include a carrier frame that may be adhered to the skin of a user.

Abstract: An injection device includes a cap (38) which is withdrawn from the front of the device before use to remove a boot (52) from the needle (50). The cap (52) has fingers (46) which grip the boot and which pass down a passage through which the needle projects to inject a dose. The passage has projections disposed to reduce the effective bore of the passage, the projections having inwardly inclined resilient portions which allow the boot to be withdrawn forwardly through the passage but prevent a finger being poked into the passage.

Abstract: A safety device for a medical injector supporting a needle projecting forwardly from the front of an injector body has a tubular sleeve which is slidable rearwardly with respect to a supported needle to expose at least the needle tip. The sleeve has a forward end for contacting an injection site and a removable cover for a needle is attached to the forward end of the sleeve. The sleeve may have an external end face lying in a radial plane with an orifice in the end face and through which a needle may project when the device is in use and the sleeve slides rearwardly. The removable cover may be attached to or otherwise be connected to the external end face, to effect a seal therewith. Alternatively, the cover may frictionally engage the forward end of the sleeve or the cover may have a bore into which an enlargement member may be pressed so as to expand the cover within the sleeve and effect a connection thereto.

Abstract: A folding panel needle guard comprises front and rear panels coupled together at hinges, a collar attached to the front panels at hinges, a guard base element coupled to the rear panels at hinges, a hub and a spring to unfold and lock the front and rear panels in a co-linear needle shielded configuration. The folding panel needle guard is mountable to a needle or syringe assembly.

Abstract: The invention relates to a safe support device for a syringe, said support comprising a support sheath for the body of a syringe, and safety means which comprise an inner sheath suitable for sliding relative to said support sheath between a waiting retracted position, in which said inner sheath is substantially retracted inside said support sheath, and an active protection position, in which said inner sheath projects from said support sheath. The inner sheath has a free end portion formed by a flexible end-piece. The invention also relates to an assembly comprising such a safe support device and a syringe having a body, a piston and a needle disposed at one end of said body.

Abstract: A safety needle device for a medical injector supporting a needle projecting forwardly from the front of the injector body has a tubular sleeve for a supported needle, the sleeve being slidable rearwardly with respect to the needle to expose at least the tip thereof. The sleeve has a forward end for contacting an injection site and a removable cover is engaged in sealing contact with the forward end of the sleeve. The sleeve may have an in-turned flange at its forward end defining an orifice through which the needle projects when the sleeve slides rearwardly. The removable cover may effect a seal to that flange.

Abstract: A one-time use device to deliver preservative-free follicle stimulating hormone (FSH) solution is disclosed. The device includes a needle covered by a sliding needle shield, which covers the needle in all modes of the device. The device can be placed into a ready-to-use position in four or fewer user steps. The device has a knob for setting a desired dose of FSH. The knob includes longitudinally spaced elements respectively corresponding to the lock position and the seven or fewer discrete dosing positions. The device locks after one use and cannot be reused thereafter.

Abstract: A system is provided for performing injections in the ventricle of a patient. The system includes an injection catheter with a proximal and distal end. Importantly, a flexible array is mounted at the distal end of the injection catheter and is moveable between a protective configuration and a flared configuration. Also, a needle of variable length is mounted on the distal end of the injection catheter and is covered by the flexible array when the array is in its protective configuration. In order to manipulate the flexible array, a locking mechanism is mounted on the proximal end of the injection catheter for engagement with the flexible array. When selectively operated, the locking mechanism moves the array from its protective configuration to the flared configuration, holds the array in its flared configuration for an injection, and subsequently moves the array back to its protective configuration.

Abstract: The invention relates to an injection device (1) being in one of a passive and active state, triggering of injection being prevented when said device (1) is in its passive state and permitted when said device (1) is in its active state, having: a housing (30, 30a, 30b) receiving a container, the container being in one of a passive state and an active state, movement of the container out of its initial position being prevented when the container is in its passive state, and being permitted when the container is in its active state, and a safety shield (40) coupled with the housing (30) and being movable with respect to the housing along a movement path having a predetermined length, first retaining means (60, 61, 54a) for maintaining the container (20) in its passive state, second retaining means (34a, 81b) for maintaining said device (1) in its passive state, said device (1) being characterized in that it comprises: first deactivating means (50, 53) and second deactivating means (50, 50a) movable coinciden

Abstract: A flange extender for use with an injection device is described. The flange extender includes first and second flange extender pieces and a locking mechanism to lock the first and second flange extender pieces to one another. In one embodiment, the locking mechanism includes each piece having a locking finger extending from the piece and an aperture adapted to receive the locking finger. The first and second flange extender pieces extend in a direction transverse to a main axis of the injection device to thereby provide a surface area for manual manipulation of the injection device during an injection. The first and second flange extender pieces also attach to each other on opposite sides of the injection device.

Abstract: A medical fluid injection device and/or medical fluid vial are disclosed. The medical fluid vial includes an outer body with a mouth and an inner member having a resilient expandable container portion and an access portion normally sealing the container portion. The injection device has a housing or needle holder mounting an access member for accessing the vial contents and a needle for injection into a patient. The housing may include a needle shield movable relative to the needle holder.

Abstract: A device useful for making retrobulbar injections includes an inner syringe contained within an outer syringe. A spring retained within the outer syringe biases the inner syringe proximally, which a catch mechanism on the two syringes prevents the inner syringe from moving out of the outer syringe. A distal needle on the inner syringe is movable within a distal sheath of the outer syringe, and can be extended beyond the distal end of the sheath to permit the device to piece more resilient tissues, and can be withdrawn by action of the spring within the sheath to protect more delicate tissues from the needle.

Abstract: A protection device with improved functionality, particularly for syringes, comprising a supporting body which is provided with a through hole for the insertion of the covering cap of a needle of a syringe, the supporting body being provided with at least one flat face, being arranged on the opposite side with respect to a face for the insertion of the covering cap in the hole, for the resting contact of the supporting body on a resting surface, the face lying opposite the flat face being provided with a raised perimetric containment rim, the hole having a diameter that is substantially larger than the diameter of the central portion of the covering cap and substantially smaller than the diameter of the end portion of the covering cap, a collar being provided around the hole, the collar extending from the face for the insertion of the covering cap.

Abstract: A catheter assembly is disclosed which includes a cannula assembly, a locking clip assembly and a housing. The locking clip assembly includes a locking clip, a collar, and a biasing member. The locking clip has a first leg defining a trigger hole and a second leg defining a binding hole. The collar is positioned to engage the locking clip and the biasing member is positioned to urge the collar into engagement with the locking clip to urge the locking clip from a first orientation to a second orientation. In the second orientation, the binding hole is positioned to bind with the insertion needle to prevent retraction of the insertion needle.

Abstract: A mechanical injection device for injecting apportioned doses of a liquid drug. The injection device comprises a dose setting assembly comprising a cap and a cap receiving part, adapted to abut or engage with the cap when the cap is mounted on the injection device, and an injection assembly. Mounting and/or dismounting of the cap on/from the injection device causes the dose setting assembly to set a dose. Thereby a correct dose of drug is automatically set during a cap on/cap off cycle. Since such a cycle is normally performed between two subsequent injections, the number of steps required to be performed by the user is reduced.

Abstract: A passive safety device for a medical needle has a mount for supporting the needle and a needle shielding sleeve co-axial with and arranged for sliding movement relative to the mount, from a shielding position to a non-shielding position. An abutment surface is provided on one of the sleeve and mount and is engageable by a radially deformable finger, when undeformed. A control member is also slidably arranged with respect to the mount and sleeve and has an initial set position. The control member co operates with the finger so that on sliding movement of the sleeve from its initial shielding position, the finger is moved radially outwardly, clear of the abutment surface and on to a sliding surface.

Abstract: A drug delivery device (100) for administering a low dose of a medicament includes a housing (111) and a drug reservoir (101) disposed in the housing (111). A needle (135) is connected to the drug reservoir (101). A pressure applying member (113) is movably connected to the housing (111) and is movable between first and second positions. The pressure applying member (113) does not apply pressure to the drug reservoir (101) in the first position and applies pressure to the drug reservoir (101) in the second position to dispense medicament stored in the drug reservoir (101). A method of administering a low dose of insulin to simulate a first-phase insulin response of a pancreas is also disclosed.

Abstract: This invention relates to medical devices useful for infusion therapy and, more particularly, to a syringe that can be selectively used with a retractable needle or with frontal attachment devices such as luer hubs, valves or other connectors in needleless systems.

Abstract: When a trigger of an injection device is released, a main spring (4) expands, driving a member (7) forwards. This compresses a weak spring (11), but a spring (5) is stiff enough to remain expanded. A syringe (2) is thus thrust forwards via a collar (9), so that a needle (3) projects from a barrel (1). The spring (4) continues to expand after the syringe has reached its forward position, with the spring (11) fully compressed, so that the stem (8) of the member (7) acts on a piston (14) within the syringe (2), to expel the dose while the spring (5) is caused to be compressed. The spring (5) ensures that the syringe is retained in its forward position during this phase.

Abstract: A medical needle cover arrangement for a single-use syringe having a medical needle with a sharp tip, the needle being mounted on the syringe to project forwardly from a needle hub. A sleeve forming a part of a safety device is mounted on the syringe. The sleeve is arranged for axial movement with respect to the needle from an initial shielding position to a non-shielding position, the sleeve being blocked against forward movement with respect to the syringe from its initial shielding position. A soft needle cover overlies the needle with the sharp tip of the needle sealed by the cover. The rear end of the soft needle cover and the forward end of the syringe hub are profiled with complementary engaging surfaces. The cover has a step part-way between its ends, the step being engaged by an internal abutment at the forward end of the sleeve, to resist movement of the cover forwardly away from the syringe hub and so maintain a seal between the cover and hub.

Abstract: The invention relates to a safety device (1) for a syringe (2), the device comprising a protective sheath (20) in which the syringe (2) can slide, said sheath (20) presenting an opening (36) at a distal portion (33), which opening is suitable for allowing the syringe (2) to project beyond the sheath (20). According to the invention, the sheath (20) presents radial resilience at its distal portion (33) suitable for enabling the sheath (20) to receive a cylinder (3, 19) of diameter greater than that of said opening (36).

Abstract: The present invention is a device for protecting against needlestick injuries, including a syringe, a sheath, an actuator, and a button. The syringe has a tube, plunger, and a needle in a hub. The sheath covers the needle in a first position, and the needle protrudes from a hole in the sheath in a second position. The plunger can be pressed to dispense from the tube in the second position. The actuator controls the movement between positions, and the button is the manual control for activating the actuator. The syringe extends through the sheath and actuator, such that the sheath and actuator can be adjusted for any type of syringe. A single hand can operate the button and the plunger.

Abstract: The present invention relates to an auto injector, e.g. a disposable auto injector, that can be safely operated for automatic injection of a dose of medication by the recipient of the medication, having a housing for accommodation of a container with at least one compartment for accommodation of a medicament to be injected and a needle mounting site for user mounting of a needle covered by a needle cap before injection, and a needle shield that is accommodated in the housing in a retracted position before mounting of the needle and that is configured to be automatically moved forward to a protruded position by a needle shield driver upon mounting of the needle and removal of the needle cap.

Abstract: A method of using a syringe and a flexible member is described. In some versions, the method may involve providing a syringe, a needle, a pre-filled cartridge, an adapter, a flexible member, a biasing element, and a guard. The method may involve retaining the guard, releasing the guard by actuating the flexible member to translate the guard in the distal direction to cover the needle, and locking the guard. In some versions, the flexible member may have a first and second position for actuation. In some versions, the flexible member may engage and disengage the guard to retain and release the guard.

Abstract: A device and method for protecting against needle sticks, including a needle protection sleeve for being coupled to an administering device to cover a needle associated with the administering device, wherein the sleeve can be moved against the force of a spring from an extended position to a retracted position and by the force of the spring from the retracted position to the extended position, the spring being carried on the needle protection sleeve.

Abstract: An automatic needle device including a housing element, at least one resilient element arranged to be located within the housing element, at least one needle bearing element adapted, when actuated, to be displaced by the at least one resilient element with respect to the housing element from a non-penetration position to a penetration position and a needle guard adapted for positioning with respect to the housing element and wherein displacement of the needle guard is operative to actuate displacement of the at least one needle bearing element from the non-penetration position to the penetration position.

Abstract: A safety device for shielding the sharp tip of a medical needle has a needle mount which either directly supports a medical needle, or indirectly supports the needle for instance where the needle is provided as a part of a syringe. A sleeve is carried directly or indirectly on the needle mount and is slidably movable to a needle shielding position where the sleeve surrounds the needle sharp tip. A spring including forwardly projecting spring blades when sufficiently loaded acts on an internal conical surface of the sleeve to drive the sleeve to its shielding position and a locking mechanism then locks the sleeve in that position. A camming mechanism serves to load the spring blades in the course of the use of the safety device such that thereafter the interaction of the blades with the conical surface urges the sleeve to its shielding position, the camming mechanism being activated by movement of the sleeve to expose the needle for use.