Abstract:
Needles include a cannula defining a bore within the cannula, a distal opening of the bore of the cannula, and one or more of at least one protrusion or an enlarged rounded surface on a proximal surface of the needle proximate the distal opening and at least one chamfered surface positioned proximate a tip of the cannula. Methods include forming at least one protrusion on a distal portion of a needle bordering a distal opening of the needle.
Abstract:
Systems and methods are disclosed for bending a needle. A device for bending a needle is disposed around a needle and coupled to an injection device. A force is exerted on the needle to cause the needle to bend upon a bending trough of the device. The device includes a proximal end to interface with the injection device and a distal end having the bending trough. The bending trough is configured to improve bending and prevent breaking of the needle by providing a rounded surface upon which the needle is bent.
Abstract:
Needle shielding systems for a dental syringe (100, 200) are disclosed. The needle shielding system (100, 200) comprises a needle (300) and a needle shield (400). The needle (300) has a needle tip (304) and a needle bulge (308) spaced apart from the needle tip (304). The needle shield (400) is slidably mounted over the needle (300) distally from the needle tip (304). Needle shield (400) comprises a base plate (404) and at least one resilient arm (416) extending distally from the base plate (404) towards the needle tip (304), wherein the base plate (404) or the at least one resilient arm (416) has at least one protrusion (424, 428) extending laterally away from the base plate (404) or the at least one resilient arm (416). In use the system (100, 200) is dragged against another structure to move the needle shield (400) along the needle (300) though interaction between said structure and said at least one protrusion (424, 428), until the needle shield (400) contacts the needle bulge (308) and the resilient arm (416) covers the needle tip (304). The syringes (100, 200) generally comprise a barrel (104, 204), plunger (108, 208), an anesthetic (112, 212), and a needle (300). The barrel (104, 204) has proximal and distal ends. The plunger (108, 208) is inserted into the proximal end of the barrel (104, 204) and is slidably moveable within the barrel (104, 204). The anesthetic (112, 212) is in contact with and between the plunger (108, 208) and the distal end of the barrel (104, 204). The needle (300) is connected to the distal end of the barrel (104, 204). In use the needle (300) is inserted into the gum or inner cheek of a patient and the plunger (108, 208) is depressed to inject the anesthetic (112, 212) though the needle (300) and into the patient. The dental syringes (100, 200) may also include a needle shield (400) slidably mounted over the needle (300).
Abstract:
A device for repetitive needleless injection of a liquid into a surface includes a handheld unit that includes at least a cell that is fillable with the liquid. A propulsion mechanism is configured to apply a sequence of pressure pulses to the liquid. Each pulse ejects a micro-jet of the liquid from the cell via an orifice between the cell and the exterior of the handheld unit with a velocity that is sufficient to enable the micro-jet to penetrate into the surface. A reservoir is connected to the cell by a conduit to enable the liquid to flow from the reservoir to the cell to replace the liquid that is ejected in the micro-jet. A controller is configured to operate the propulsion mechanism repeatedly so as to eject the sequence of the micro-jets.
Abstract:
An injection needle assembly (50) for an injection device, comprising: a) a needle cannula (3) attached to a needle hub (4) and defining a pointed tip at a free end (3a, 3b), and b) a needle cover (10, 10a, 10b) forming an axially extending elongated flexible enclosure accommodating the needle cannula (3). The needle cover (10, 10a, 10b) is configured to axially collapse and become penetrated by the needle cannula (3) when a penetration force is applied to the needle cover. The needle cover (10, 10a, 10b) defines a shaft section (11a) and a bulb section (11b). The shaft section (11a) encircles the needle cannula (3) and extends axially from the needle hub (4) to the bulb section (11b). The shaft section (11a) comprises wall areas of minimum wall thickness t 1 whereas the bulb section (11b) comprises wall areas (17a, 17b) having a wall thickness t 2 larger than said minimum wall thickness t 1 . The shaft section (11a) comprises one or more reinforcing ribs (16), each reinforcing rib extending non-parallel to the needle axis so as to at least partly encircle the needle cannula (3), wherein each reinforcing rib (16) divides adjoining annular collapse regions (15) of the shaft section (11a).
Abstract:
An apparatus includes a microneedle that defines a lumen therethrough. The microneedle has a proximal end portion a distal end portion and a hub portion between the proximal end portion and the distal end portion. The proximal end portion is configured to be coupled to a medicament container, such as, for example a syringe. The portion of the lumen within the proximal end portion has a first diameter. The distal end portion is configured to pierce a target tissue. The portion of the lumen within the distal end portion has a second diameter smaller than the first diameter. The hub portion includes a surface configured to contact the target tissue when the distal end portion is disposed with the target tissue.