Abstract: Systems and methods for modifying a medical model of a physical system is disclosed. One disclosed system includes a graphical user interface configured to display at least one parameter associated with the medical model and receive a modification of the at least one parameter. The system also includes a processor configured to receive the modification of the at least one parameter from the graphical user interface and execute a simulation of a part of the medical model including the modification of the at least one parameter.

Abstract: A device for raising and lowering a load has a braking device, brake indicator, and a one-way pulley. The braking device uses a wedge-shaped braking element to stop the advancement of a cord. The brake indicator indicates when the braking device is enabled. The one-way pulley allows the load to be lowered at a steady rate and uses a braking element positioned between a stop pin and a braking surface.

Abstract: A pressure gauge and regulator for use in dispensing compressed air and similar gases from pressurized vessels. The device includes a linear pressure gauge having a spring loaded plunger slidingly carried within a cylinder. The plunger has an O-ring to seal against the cylinder wall, and a spring with a spring constant linearly relating longitudinal movement of the plunger to gas pressure against the plunger. A viewing port in the cylinder wall allows viewing of the position of the plunger and corresponding gas pressure. A hole in the cylinder wall may be provided to allow excess pressure to escape when the plunger seal is depressed past this hole. The device also includes a ball and seat valve for selectively releasing compressed gas from the inlet to the outlet. A piston movable in response to gas pressure at the outlet controls the valve, and a compression spring is provided for selectively urging the piston against this gas pressure.