Abstract: A pneumatically operated veterinary medicinal pellet implanter utilizes pressurized air to drive an impeller for dispensing medicinal pellets through a needle on an end of the implanter and into a cavity created by the needle under the skin of an animal to be treated. The pressurized air source may also be utilized to retract the impeller after dispensing of the pellets. The impeller is part of a piston slidingly secured within a pneumatic cylinder. Pressurized air is selectively and alternatingly supplied to the front and rear and rear of the cylinder for advancing the impeller between retracted and extended positions respectively. The pressure of the air supplied to the rear of the cylinder for driving the impeller is reduced relative to the pressure of the air supplied to the front of the cylinder for retracting the impeller.

Abstract: A veterinary implanter includes an attached disinfectant dispenser including a reservoir for holding a quantity of disinfectant, a pump attached to the reservoir, and a special needle holder spray tip with the implanter including a conduit which has an inlet opening connected to the disinfectant pump. An exit opening of the conduit is coupled to the needle spray tip which is designed to spray disinfectant 360 degrees about the inlet end of a hypodermic needle cannula which is held in place against the spray tip by a threaded needle holder extension. The inventive disinfectant dispenser thus allows an operator of the implanter to selectively inject a quantity of disinfectant into the needle with each implant, with the disinfectant then being carried by the implanted pellets into a wound created by the needle.

Abstract: A metal tip attachment for a plastic needle is stamped from relatively thin sheet metal and rolled into a generally cylindrical shape adapted to conform to the outer surface of the needle. The attachment includes a pointed end and a base. Securement structure such as tabs are formed in the base and are adapted to cooperate with corresponding grooves in the outer surface of the needle for securing the attachment thereto. The attachment is secured to the needle such that at least a portion of the pointed end of the metal sheet extends slightly beyond the point of the needle.

Abstract: A slide action veterinary implanter apparatus includes a tubular housing having a hand grip extending therefrom with a trigger assembly pivotally mounted in the hand grip. A slide member is slidably mounted on the housing and retracts an impeller member to a retracted position, extends the trigger to an armed position, and advances a pellet magazine, extending through the hand grip, by reciprocation of the slide member. Additionally, a latch mechanism engaged with the slide mechanism, the trigger, and the impeller causes an impeller extending force to be stored and retained in an impeller extender spring as the slide member is reciprocated. Pivoting the trigger into the hand grip toward a release position releases the latch mechanism, whereby the extender spring force resiliently urges the impeller through a pellet magazine chamber driving a stack of pellets therefrom and through a needle mounted on the front end of the implanter housing.

Abstract: A rotary vee engine with through-piston induction includes a housing supporting a pair of rotors positioned in an obtuse angular relation and having pluralities of cylinders mounted thereon about respective rotor axes. Aligned cylinders in the opposite rotors have vee shaped double piston assemblies slidable and rotatably received therein. Fuel/air charges are inducted into the cylinders through apex ports in the piston apex portions, through fluid passages in the pistons, piston intake ports in the piston heads, and cylinder intake grooves formed in the inner walls of the cylinders. The cylinder intake grooves in each cylinder include a pair of axially elongated grooves with a trailing groove being staggered toward a cylinder head in relation to a leading groove and in relation to cylinder exhaust ports positioned opposite the grooves. The piston intake port is circumferentially elongated at least a distance to overlap both grooves.

Abstract: A medicament implanter system which comprises:a single use needle pre-charged with medicament;a cartridge wherein a multiplicity of pre-charged needles may be packaged; andan implanter applicator instrument adapted to remove a pre-charged needle from the cartridge, and to reinsert a used needle into the cartridge.The applicator instrument is constructed so that a needle positioned therein is locked in properly oriented position for expulsion of the medicament upon operation of an impeller which forms part of the applicator instrument.

Abstract: A medicament implanter system which comprises:a single use needle pre-charged with medicament;a cartridge wherein a multiplicity of pre-charged needles may be packaged; andan implanter applicator instrument adapted to remove a pre-charged needle from the cartridge, and to reinsert a used needle into the cartridge.The applicator instrument is constructed so that a needle positioned therein is locked in properly oriented position for expulsion of the medicament upon operation of an impeller which forms part of the applicator instrument.

Abstract: In pistol grip medicament implanter devices, wherein a trigger coupled to a plunger causes plunger advance movement that expels the medicament from the device when the trigger is pulled, a spring that forms part of the coupling and a lost motion arrangement controlled by the spring that converts trigger pull movement into spring take-up of the trigger movement when the plunger encounters resistance to advance movement greater than the spring bias. The trigger continues to move but the plunger does not, then when resistance to movement of the plunger becomes less than the spring bias, the spring force serves to advance the plunger, recovering the trigger pull motion previously lost.The greatest force that can be applied by the plunger to the medicament implant has become whatever bias is selected for the spring.