Flow cytometer method and apparatus
First Claim
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1. A nozzle for use in flow cytometry apparatus for analyzing particles in a fluid stream, said fluid stream comprising a sheath stream surrounding a core stream containing said particles, said nozzle comprising:
- a nozzle having an interior surface defining a flow path for said fluid stream, and an orifice for exit of the fluid stream from the nozzle;
a sample injection needle disposed within the nozzle; and
a baffle plate located downstream of the sample injection needle in the nozzle positioned in said flow path upstream from said orifice for deflecting the fluid stream as it moves along said flow path, the baffle plate and interior surface of the nozzle being configured to orient the particles in a desired orientation as they exit the orifice.
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Abstract
A nozzle for use in a flow cytometer and a method of orienting particles with a baffle disposed within a nozzle. The baffle may be a baffle plate positioned in a fluid flow path to deflect a fluid stream and to orient particles in a desired orientation as they exit the nozzle.
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Citations
25 Claims
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1. A nozzle for use in flow cytometry apparatus for analyzing particles in a fluid stream, said fluid stream comprising a sheath stream surrounding a core stream containing said particles, said nozzle comprising:
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a nozzle having an interior surface defining a flow path for said fluid stream, and an orifice for exit of the fluid stream from the nozzle; a sample injection needle disposed within the nozzle; and a baffle plate located downstream of the sample injection needle in the nozzle positioned in said flow path upstream from said orifice for deflecting the fluid stream as it moves along said flow path, the baffle plate and interior surface of the nozzle being configured to orient the particles in a desired orientation as they exit the orifice. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of orienting particles in a flow cytometry apparatus, said method comprising:
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forming a fluid stream by introducing a core stream of sample fluid containing particles into a sheath fluid so that the sheath fluid surrounds the core stream; flowing the fluid stream having a core stream and sheath fluid through a nozzle having an interior surface defining a flow path that generally tapers from an upstream portion of the nozzle to an orifice at the downstream end of the nozzle; and deflecting the core stream with a baffle plate as it flows through the nozzle to subject the particles in the core stream to hydrodynamic forces that tend to cause the particles to assume a desired orientation. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification