摘要:
An apparatus is disclosed for separating a suspension comprising at least two types of particles which are differently sized or shaped and in which the first type of particle may be deformable at a relatively lower force or faster rate than the second type of particle. A housing is provided having a generally cylindrical inner surface in which is mounted a rotor having a generally cylindrical outer surface. The outer surface of the rotor is spaced from the inner surface of the housing to define a suspension processing gap. A filter membrane is provided on the surface of the rotor or the housing that has pores with substantially precisely dimensioned shapes and sizes to correspond substantially to the shape of the first type of particle, thus allowing passage of the first type of particle and blocking passage of the second type of particle. A suspension is directed into the processing gap for either a selected residence time in contact with the filter membrane and/or at a selected force.
摘要:
A method and apparatus for filtering suspensions of medical and biological fluids, one aspect of which is separating a suspension comprising at least two types of particles which are differently sized or shaped and in which the first type of particle may be deformable at a relatively lower force and/or faster rate than the second type of particle. A filter member is provided having substantially precisely dimensioned pore sizes, with the pores being dimensioned to allow passage of the first type of suspended particle without distortion or only minimal distortion and passage of the second type of particle only with substantial distortion. Because the filter membrane has precisely dimensioned pores, with spacing between the pores being maintained despite the smaller interval between the pores, the porosity of the membrane may be much greater than nominal pore size membranes, allowing faster filtration rates and/or smaller membranes for a given filtration rate, while reducing the exposure time of the cells within the shear environment, and consequently reducing particle damage. Various methods for preventing clogging of the membrane are also disclosed.
摘要:
An oral airway for insertion into a mouth and pharynx of a patient to provide a breathing pathway and for cooperating with either an anesthesia breathing connector, a suction tube, or a nasal cannula. The oral airway includes a first tubular member, a second tubular member disposed within the first tubular member, and a connector configured to securely attach to both the first tubular member and the second tubular member. The connector includes a first portion in fluid communication with the first tubular member and a second portion in fluid communication with the second tubular member.
摘要:
A system for sketching, illustrating, drawing or painting likeness compositions such as canvas oil paintings from source images includes a set of increasing size reusable overlayable source image grids with image composition frames used with corresponding destination canvas grid patterns, allowing a consistent grid pattern for all canvas sizes by using predetermined grid dimensions for each canvas size. The image grid patterns may be affixed to clear plastic sheets or may be software-generated patterns. This combination greatly simplifies the use of grids in artwork and provides low-cost timesaving methods to draw accurate perspective. The system includes a unique canvas grid ruler for simplifying generation of canvas grid lines and in some embodiments canvases are pre-printed or backside-shadowed with appropriate canvas grid patterns and labels.
摘要:
A method and system for adaptively controlled withdrawal/infusion of a fluid, such as blood, to or from a fluid source, such as a blood vessel. An adaptive flow rate limit is established and periodically adjusted during the course of withdrawal/infusion so as to maximize and optimize the withdrawal/infusion rate while, at the same time, providing for rapid corrective adjustments in flow rate responsive to early indications of flow disruption, such as occlusion or collapse of the blood vessel during blood withdrawal. The method and system of the invention is particularly applicable to automated apheresis systems.
摘要:
A toilet bowl system with a floating and self-rinsing deflector for receiving and noiselessly dispersing urine into the water located in the bottom of said toilet bowl.
摘要:
An oral airway for insertion into a mouth and pharynx of a patient to provide a breathing pathway and for cooperating with either an anesthesia breathing connector, a suction tube, or a nasal cannula. The oral airway includes a first tubular member, a second tubular member disposed within the first tubular member, and a connector configured to securely attach to both the first tubular member and the second tubular member. The connector includes a first portion in fluid communication with the first tubular member and a second portion in fluid communication with the second tubular member.
摘要:
A system is provided for weighing and monitoring flow from multiple fluid sources into a flow system wherein incoming fluid is received in a weighing bag attached to a control system for monitoring the amount of fluid passed through the weighing bag and for preventing admission of air into the flow system. An alarm attached to the weighing bag warns when fluid in the weighing bag is approaching empty, so that the fluid in the weighing bag can be replenished from the fluid source before the weighing bag runs dry. If fluid in the weighing bag is not replenished, the system automatically shuts down.The fluid pump can be absolutely calibrated using the controlled admission of known amounts of fluid into the weighing bag so that the amount of fluid introduced into the flow system through the weighing bag can be calculated automatically.
摘要:
An adaptive filter concentrate flow control system and method includes a filter system, a pumping system driving feed fluid, concentrate and filtrate flowing through the filter system and a flow control system controlling the pumping system to maintain optimum filtrate flow rates or minimum feed flow rates along a control surface in a three dimensional transmembrane pressure--feed fluid rate--filtrate flow rate space. Actual sensed operating point data is used to locate the control surface so as to assure an optimized filtrate flow rate or minimized feed flow rate at which reversible blocking of the membrane has begun to occur without irreversible blocking or plugging. The system is advantageously employed to control and maximize the flow of plasma in a plasmapheresis system or to minimize the rate at which blood is withdrawn from a donor and introduced into the system while achieving a fixed rate of plasma flow.