Abstract: A compound capillary can provide different sizes and configurations for central and outer passages to suit a variety of process applications, in particular methods of separative transport of multi-component samples and precise heat control of fluid streams on a micro scale. The compound capillary can be formed from ductile glass material into an assembly that typically provides a central passageway for retaining one fluid or material and single or multiple outer passages for retaining different fluids or materials. One or more of the different passages may also retain one more different stationary phase to tailor the separative transport to the material of particular sample streams. The compound capillary has particular application to the field of capillary electrophoresis where the multiple capillary passages in a single capillary tube may be used to increase sample through, or used for different function such as cooling and/or the establishment of transverse electrical potentials.

Abstract: The present invention uses a flow restrictor to provide a capillary size opening that minimizes any discharge of toxic gases from compressed gas cylinders in the unlikely event of the control valve or regulator failure. The use of this arrangement to provide a flow restriction in combination with a regulator in the form of a dispensing check valve provides a virtually fail safe system for preventing hazardous discharge of fluid from a pressurized cylinder or tank. A capillary tube or other structure can provide capillary size openings that minimizes any discharge of gas in the unlikely event of a failure of the regulator. Location of the inlet to the capillary tube at the midpoint of the cylinder can also prevent the discharge of liquid from the cylinder if the control valve system fails. Limiting the accidental discharge of fluid from the cylinder to gas phase fluids greatly reduces the uncontrolled mass flow rate at which fluid can escape from the cylinder.

Abstract: The present invention uses a flow restrictor in the form of a tube containing multiple capillary sized passages to minimize any discharge of toxic gases from compressed gas cylinders in the unlikely event of the control valve or regulator failure. The use of this arrangement to provide a flow restriction in combination with a regulator in the form of dispensing check valve provides a virtually fail safe system for preventing hazardous discharge of fluid from a pressurized cylinder or tank. The multiple capillary passage structure provides carefully sized openings that minimize any discharge of gas. Location of the inlet to the capillary tube at the midpoint of the cylinder can also prevent the discharge of liquid from the cylinder if the control valve system fails. Limiting the accidental discharge of fluid from the cylinder to gas phase fluids greatly reduces the uncontrolled mass flow rate at which fluid can escape from the cylinder.

Abstract: The present invention uses a regulator in the form of dispensing check valve and a flow restriction arrangement to provide a virtually fail safe system for preventing hazardous discharge of fluid from a pressurized cylinder or tank. A diaphragm controls the movement of a check valve element to prevent discharge of gas from a tank unless a predetermined vacuum condition exists downstream of the check valve. A capillary tube or other structure that provides capillary size opening minimizes any discharge of gas in the unlikely event of a failure of the regulator. This system is particularly useful in the delivery of arsine gas and provides multiple safeguards against accidental discharge.

Abstract: A cardiac prosthesis having a hydraulically actuated compressible blood pump. An actuation chamber adjacent the blood pump receives hydraulic actuation fluid from an actuator pump through a three-way ventricular dump valve to compress the blood pump during systole and eject blood therefrom. During diastole the actuation fluid is permitted to drain from the actuation chamber through the three-way valve into a reservoir. The valve includes inlet and outlet manifolds and synchronously movable valve members within each manifold for controlling the flow of actuation fluid into and out of the actuation chamber.

Abstract: A cardiac prosthesis having a hydraulically actuated compressible blood pump. An actuation chamber adjacent the blood pump receives pulses of hydraulic actuation fluid from an actuator pump through a fluid inlet path to compress the blood pump during systole and eject blood therefrom. Between pulses the actuation fluid is permitted to drain from the actuation chamber through an outlet path into a reservoir. Discharge of fluid through the outlet path is controlled by a dump valve which is adapted to close or open the outlet path primarily in response to forces which vary as a function of the flow of actuation fluid through the fluid inlet path.