Abstract: Embodiments of the present invention provide modular grid systems for use with aperture-forming devices. The modular grid system includes a plurality of modular grids, wherein each modular grid includes an outer frame, an outer partial ring coupled to the frame, and at least one inner partial ring coupled to the outer partial ring via at least one securable connection, wherein the outer partial ring and the at least one inner partial ring form arcs of greater than 180 degrees but less than 360 degrees. Each modular grid is coupled to an adjacent modular grid. In some embodiments, the outer frame comprises a removable bar. In some embodiments, the plurality of modular grids are oriented in the same direction. In some embodiments, the modular grid is configured to couple to an aperture-forming device, where the aperture-forming device has a diameter ranging from 2 to 6 inches.

Abstract: Embodiments of the present invention provide modular grid systems for use with aperture-forming devices. The modular grid system includes a plurality of modular grids, wherein each modular grid includes an outer frame, an outer partial ring coupled to the frame, and at least one inner partial ring coupled to the outer partial ring via at least one securable connection, wherein the outer partial ring and the at least one inner partial ring form arcs of greater than 180 degrees but less than 360 degrees. Each modular grid is coupled to an adjacent modular grid. In some embodiments, the outer frame comprises a removable bar. In some embodiments, the plurality of modular grids are oriented in the same direction. In some embodiments, the modular grid is configured to couple to an aperture-forming device, where the aperture-forming device has a diameter ranging from 2 to 6 inches.

Abstract: A flow control device for regulating fluid flow through a length of flexible tubing comprising (a) a body assembly comprising a lower surface with a groove for supporting a length of flexible tubing, opposing side walls extending in the vertical plane along the longitudinal axis from the lower surface defining a passage for the tubing, a guide groove in one of the side walls, a rack gear positioned in the guide groove; (b) a rotatable cam assembly comprising a cam with an irregular radius which, at one position of rotation, extends into the passage, a pinion gear extending axially from and having the same center of rotation as the cam, wherein the pinion gear extends into the guide groove and operatively engages the rack gear; and (c) a cover connected to the top of the body assembly for retaining the pinion gear in operative engagement with the rack gear.