Abstract: A pulsatile pump the output of which is infinitely variable between a slow pulsatile flow and increased up to a sharply pulsed flow rate until the pulses run together and a smooth flow results, and which may be varied between wide output pressure and frequency limits. The pump is comprised of a pneumatic control circuit, at least two pneumatically isolated compression chambers, and a novel inlet/outlet pump cartridge and condition-responsive locking means. Operation of the pump is controlled by the use of novel tactile pneumatic response switches. Each compression chamber is communicated with a supply of working fluid through the cartridge. Means are provided for varying the operation of the pneumatic circuit and hence the pump. A flow of pressurized fluid, such as air or nitrogen, is used as the operating media of the pneumatic circuit, although other fluids may be used. Means for monitoring and adjusting pump system parameters are also provided.

Abstract: A composite suction and irrigation probe is provided for performing the functions of irrigation and suction alone or simultaneously with the use of a single trumpet valve. The probe consist of an inner cannula and an outer cannula. In the first embodiment the inner cannula is attached to one probe mount end of the valve body while the outer cannula is attached to a second and opposite probe mount end. The inner cannula is inserted through a common channel of the valve body and the outer cannula. In the second embodiment, the inner cannula is attached to the outer cannula prior to attaching the probe to the valve body. The designated suction and irrigation ports located within the common channel of the valve body are isolated from each other to provide discrete and dedicated ports.

Abstract: A valve assembly includes a housing having at least one valve orifice for fluid flow therethrough, and a valve member which moves between a fully closed position and a fully open position, respectively, closing and opening said valve orifice. The valve orifice has a clearance surface forming an auxiliary valve passageway selectively enabling flow communication therethrough in an intermediate position of the valve member between said fully open and fully closed positions, and in the intermediate position the valve member partially obstructs the valve orifice so that the passageway provides attenuated fluid flow communication through the valve orifice relative to fluid flow communication in the fully open position of the valve member. A manually controlled actuator enables limited displacement of the valve member between the fully closed position and the intermediate position for the attenuated flow communication through the valve orifice.