摘要:
Apparatus and methods for detecting, characterizing, and compensating motion-related error of moving micro-entities are described. Motion-related error may occur in streams of moving micro-entities, and may represent a deviation in and expected arrival time or an uncertainty in position of a micro-entity within the stream. Motion-related error of micro-entities is observed in a flow cytometer, e.g., as pulse jitter, and is found to have a functional dependence on a parameter of the system. The pulse jitter can be compensated, according to one embodiment, by adjusting data acquisition observation windows. For the flow cytometer, a reduction of pulse jitter can improve measurement accuracy, resolution of doublets, system throughput, and enable an increase in an interrogation region for probing the micro-entities.
摘要:
There is provided a microparticle sorting device that automatically optimizes a fluid stream. There is provided a microparticle sorting device that includes a voltage supply unit that supplies a driving voltage to a vibratory element that applies vibration to an orifice that produces a fluid stream, a charge unit that imparts charge to at least some droplets ejected from the orifice, deflecting plates, arranged opposing each other with the fluid stream S therebetween, that vary a travel direction of the droplets, and a first image sensor that acquires an image of the droplets passing between the deflecting plates. The microparticle sorting device is equipped with a controller that detects the droplets in the image, sets a standard band corresponding to a width of the droplets before imparting the charge, and controls the driving voltage of the voltage supply unit so as to further decrease a quantity of the droplets detected in areas within a designated number of pixels from the standard band from among the droplets after imparting the charge.
摘要:
A system is disclosed that enables the automated measurement of cellular mechanical parameters at high throughputs. The microfluidic device uses intersecting flows to create an extensional flow region where the cells undergo controlled stretching. Cells are focused into streamlines prior to entering the extensional flow region. In the extensional region, each cell's deformation is measured with an imaging device. Automated image analysis extracts a range of independent biomechanical parameters from the images. These may include cell size, deformability, and circularity. The single cell data that is obtained may then be used to in a variety of ways. Scatter density plots of deformability and circularity may be developed and displayed for the user. Mechanical parameters such as deformability and circularity may be gated or thresholded to identify certain cells of interest or sub-populations of interest. Similarly, the mechanical data obtained using the device may be used as cell signatures.
摘要:
An improved nozzle system for a flow cytometer have been invented for a high efficiency orientation and sorting process of a flat sample and dedicates items such as equine or bovine sperm cells. This improved nozzle system comprises a nozzle (16) with a novel interior surface geometry that can both gently accelerate the cells and can include an elliptical-like, single torsional interior surface element within (c) the nozzle, i.e., a single torsional orientation nozzle (6). The elliptical-like, single torsional interior surface element (e.g.) (8, 9, 10) may have a laminar flow surface and may produce the simplest flow path for applying minimal forces which act in either an accelerative nature or orienting hydrodynamic forces, namely, the single torsional orientation forces, to orient a flat sample (16) such as animal sperm cells into a proper direction for an analyzing and efficiently sorting process in clinical use, for research and for the animal insemination industry.
摘要:
A system and method for analyzing one or more particles in a flow cell comprises focusing the one or more particles in a fluid stream with an acoustic standing wave to acoustically focus the one or more particles in a flow cell. The fluid is transited within the flow cell with a linear flow velocity ranging between about 0 meters/second and about 10 meters/second in the forward or reverse direction.
摘要:
A method for controlling one or more parameters of a flow cytometer type measurement system, is disclosed. The comprises the following steps - measuring a time in which a microsphere (10) travels from a first detection window of the flow cytometer type measurement system to a second detection window of the measurement system; and - altering an applied pressure of the measurement system such that the time is substantially constant.
摘要:
A flow cytometer system, comprising a sample injection tube having an injection point through which a sample may be introduced, a sheath fluid container having a bottom end and wherein said sample injection tube is located within said sheath fluid container, a sheath fluid port connected to said sheath fluid container, a first axial motion surface in a nozzle, a second axial motion surface in said nozzle, a limited maximal acceleration differentiation transition area between said first axial motion surface in said nozzle and said second axial motion surface in said nozzle wherein said limited maximal acceleration differentiation transition area is coordinated with said sample so as to be affirmatively limited to not exceed the practical capabilities of said sample over its length and an analytical system which senses below said nozzle.
摘要:
The present invention is a method and apparatus for acoustically manipulating one or more particles. Acoustically manipulated particles may be separated by size. The particles may be flowed in a flow stream and acoustic radiation pressure, which may be radial, may be applied to the flow stream. This application of acoustic radiation pressure may separate the particles. In one embodiment, the particles may be separated by size, and as a further example, the larger particles may be transported to a central axis.
摘要:
A system and method for analyzing one or more particles in a flow cell comprises focusing the one or more particles in a fluid stream with an acoustic standing wave to acoustically focus the one or more particles in a flow cell. The fluid is transited within the flow cell with a linear flow velocity ranging between about 0 meters/second and about 10 meters/second in the forward or reverse direction.
摘要:
Apparatus and methods for measuring the fluorescence of large multi-cellular organisms in a sample (102, 804) of liquid includes a pumping mechanism, a fluorescence measuring device (104), a method of analyzing (100, 300, 508) the measurements, and optionally, a sorting mechanism (502). The pumping mechanism transfers large multi-cellular organisms from a reservoir (402, 836) through a fluorescence-measuring device (104) causing minimum physical damage and/or stress. The pressure differential driving the organisms from a sample container/reservoir through the measuring device can be derived from gravity (800), air pressure (412), or liquid pressure, or some combination of the three. The fluorescence can be measured in a cytometer using a light detector or imager (106). Generally the detection element will include a filter (114), isolating the wavelength of fluorescent emission. The illumination may be provided by a laser (112) or by an LED (302), combined with the use of dichroic mirrors to allow multiple wavelength simultaneous illumination. In addition, an LED will typically be used with a filter to isolate the optimum excitation wavelength while blocking scattered/reflected LED light from the detection element (but not the fluorescence).