Abstract: A medical apparatus flow restrictor includes a housing having an inlet housing member defining an inlet and a separate outlet housing member mated with said inlet housing member and defining an outlet from the flow restrictor. A fluid path is defined through the housing members between the inlet and outlet. Opposed flow restriction surfaces are defined between at a location along the fluid path such that fluid delivered to the inlet passes between the opposed flow restriction surfaces prior to flowing from the outlet. The opposed flow restriction surfaces have a relative degree of surface roughness and opposed surface area defined as a function of a desired flow rate of fluid through the restrictor.

Abstract: A medical apparatus flow restrictor includes a housing having an inlet and an outlet, and a fluid path defined through the housing between the inlet and the outlet. At least one pair of opposed restriction devices are seated within the housing between the inlet and outlet. The restriction devices have opposed surfaces placed in contact against each other and are disposed in the flow path such that fluid delivered through the inlet passes between the opposing surfaces prior to flowing from the outlet. The opposing surfaces have a relative degree of surface roughness and opposed surface area defined as a function of a desired flow rate of fluid through the restrictor.

Abstract: A counting mechanism for detecting and registering the number of rounds fired from a recoil gun includes a housing that can be mounted to a component of the gun that exhibits recoil motion upon firing of a round. A counting device is contained within the housing and includes an actuator that is activated by the recoil motion of the gun component upon a round being discharged. A weighted mass is movable within the housing with the recoil motion of the gun component, and the actuator is operably configured with the mass such that movement of the mass resulting from the recoil motion actuates the actuator and increments the counting device.

Abstract: A counting mechanism for detecting and registering the number of rounds fired from a recoil gun includes a housing that can be mounted to a component of the gun that exhibits recoil motion upon firing of a round. A counting device is contained within the housing and includes an actuator that is activated by the recoil motion of the gun component upon a round being discharged. A weighted mass is movable within the housing with the recoil motion of the gun component, and the actuator is operably configured with the mass such that movement of the mass resulting from the recoil motion actuates the actuator and increments the counting device.

Abstract: A medical apparatus flow restrictor includes a housing having an inlet and an outlet, and a fluid flow path defined through the housing between the inlet and outlet. At least one pair of opposed restriction surfaces are provided in contact with each other within the housing between the inlet and the outlet. The restriction surfaces are disposed in the flow path such that fluid delivered to the inlet passes between the opposed restriction surfaces prior to flowing from the outlet. At least one of the restriction surfaces comprises a pattern of fluid passages formed into the surface, the passages having a size and shape and cooperating with the opposed restriction surface such that a desired flow rate of fluid is achieved through the restrictor.