The invention is concerned primarily with a piston action pump/syringe usable for veterinary work in particular (but not confined to this use) for the dispensing of metered doses of liquids or pastes, and includes a cylindrical body reciprocally housing a piston end of a co-axial plunger which extends outwardly from the body, the plunger and piston end having a common bore through which the body contents can be dispensed. The outlet end of the plunger, which is provided with a nozzle, has a novel one way valve permitting egress of the body contents and the end of the body remote from the plunger has a novel one way inlet valve for ingress of liquid or paste from a connected supply source. Preferably the invention includes an operating hand grip for the pump/syringe of one piece plastics construction.
A drench gun having a nozzle, an interacting sleeve and piston to eject drench through the nozzle, and wherein the nozzle is generally "U" shaped and the gun adapted to be used by one hand of an operator.
A stroke length regulating apparatus for use with plunging dispensers such as syringes includes a device for compressing the plunging dispenser consisting of a pair of supports movable relative to one another, a device for arresting relative displacement of the pair of supports at a selected end point which includes a threaded metering rod fixed near one end thereof to one of the supports, an elastically deformable nut having internal threads threadably engagable with the threaded metering rod along the length thereof, and a device for permitting temporary elastic deformation of the elastic deformable nut so as to disengage threads on the elastically deformable nut from threads on the metering rod, whereby to permit free movement of tile pair of supports relative to one another for stroke length adjustment of the dispenser.
An injection syringe useful in the medical arts for injecting high viscosity fluids or pastes, particularly in endoscopic applications. The syringe includes a force multiplying mechanism to infuse viscous medicaments such as collagen or polytetrafluoroethylene paste, with a controlled metering action. The force multiplying mechanism is provided by the combination of lower piston cylinder chamber that intersects with an upper cylinder chamber, wherein the piston is connected to a piston advancing means on a lever pivot arm.
A back fill syringe assembly (10) which is supplied by a fluid from a bottle (12) through a tube (11) is described. The syringe assembly preferably automatically refills upon injection of an animal.
An inhaling device for use in inhaling an active powdered or liquid substance from a reservoir comprising a housing defining a dispersing chamber into which the active substance may be sucked in a dispersed condition, the dispersing chamber being defined by at least one wall part that is movable between first and second positions in which the chamber attains a minimum volume and a maximum volume, respectively, means for biasing the movable wall part toward the second position so as to suck active substance into the dispersing chamber from the reservoir, and a mouthpiece that enables a patient to inhale a dispersed active substance from the dispersing chamber.
