Abstract: A pneumatic hypodermic syringe pole of first and second axially connected hollow tubes joined by a coupling cylinder supporting an axially slidable valve member including a hollow valve stem adapted to sealingly engage opening within the end of a hollow syringe body whose opposite end carries a needle. A plunger within the syringe separates the body interior into a drug injection chamber communicating with the needle and a second chamber capable of receiving gas under pressure for driving the plunger to displace a drug from the injection chamber. The first hollow tube operates as a handle for manual grasping and forms a pressurized gas storage compartment open to the axially displaceable valve member. The syringe is axially shiftable internally of the second hollow tube forming a syringe holder with the valve stem being positioned in the path of movement of the axially displaceable syringe.

Abstract: A portable device is provided for dispensing fluid in a controlled manner, and, optionally, for mixing two or more fluid components prior to dispensing the resulting mixture. The device comprises a modified syringe provided with needle valve and associated cannula through which fluid is drawn into the syringe chamber and expelled therefrom in a controlled manner by appropriate movement of the piston. In a particular embodiment propellant gas is released behind the piston which, in sealing slidable engagement with the syringe cylinder, thereby exerts expelling pressure on the fluid in the cylinder chamber. The rate of expulsion of fluid from the chamber is regulated by adjustment of the needle valve. The device is especially adapted for mixing two or more liquid components of a periodontal composition and for controlled dispensing of the resulting composition at the locus to be treated.

Abstract: A novel syringe is provided herein. It includes a cylindrical barrel having a closed forward end provided with a longitudinally-extending channel therethrough. A hypodermic needle is slidably received in the channel. A frangible septum is disposed in the channel and is adapted to be pierced upon inward sliding movement of the hypodermic needle. At least a single stopper is slidably and sealingly disposed in the barrel to divide the barrel into (i) a forward, payload chamber, defined between the closed forward end of the barrel and the leading face of the stopper, and (ii) a rearward propulsion chamber downstream of the trailing face of the stopper. The propulsion chamber is controllably variably prechargeable to a predetermined gaseous pressure. The syringe may be used with a novel retractable collar and with a novel sliding fin assembly.

Abstract: An infusion pump is disclosed in which a canister of compressed gas is regulated to provide a continuous source of pressure to one or more compressible fluid sources. Valves on the outlets of the sources prevent fluid from escaping except when the valves are opened. The valves are opened by solenoids which are selectively activated to open the valves.

Abstract: A dispensing device in the form of a caulking gun is adapted to receive interchangeable cartridges. In addition, it comprises means introducing compressed air at activation into the cartridge from behind so as pneumatically to press a piston plate present therein and consequently the material present in the cartridge forward towards the discharge nozzle of the cartridge. In order to permit an easy interchanging of the cartridge as well as to obtain a very simple caulking gun, the dispensing device comprises an open supporting means and a sealing piston. The sealing piston is adapted to be sealingly pressed against the rim of the cartridge from behind so as to close said rim when the cartridge is pressed against the front end of the supporting means. At the same time the caulking gun comprises a passage extending through the sealing piston so as to permit compressed air to enter at the rear end of the cartridge at activation.

Abstract: The pump (10 or 150) is adapted to deliver liquid (24 or 166) to an individual. The pump comprises a syringe section (12 or 152) including a syringe barrel (18 or 160) having a nozzle (20 or 162) at one end and a syringe piston (22 or 170) in the barrel (18 or 160), an intermediate section (14 or 154 and 156) mounting a piston rod (46 or 265) for axial movement thereof, one end of the rod (46 or 265) being associated with the piston (22 or 170) for acting on the piston (22 or 170), and a drive section (16 or 158) at the other end of the pump (10 or 150) including a gas spring (113 or 300) associated with the other end of the piston rod (46 or 265) for acting on same to move the piston rod (46 or 265) which moves the syringe piston (22 or 170) to cause liquid to be delivered from the syringe barrel (18 or 160).

Abstract: Automatic parenteral infusion equipment for safely delivering, under substantially constant pressure and at a substantially constant rate of flow, infusion liquid to a patient's body. The apparatus includes a chamber for containing the infusion liquid, a pressure force remote from the infusion liquid chamber, a force transmission means interposed between the pressure source and the infusion liquid chamber, vent means to discharge compressible or incompressible fluid used as a force transmission vehicle in order to prevent the possibility of embolism or toxicity to the patient, and flow regulating member including a restricted orifice to deliver infusion liquid to the patient at a substantially constant rate. Alternative embodiments of the invention are disclosed for adaptation to both ambulatory and immobile patients.