Patent ID: 7242474
Filing Date: 2007-07-10
Classification: G01N,Y10T

Abstract:
1. A cytometer system comprising: a flow channel having an axis; a hydrodynamic focusing channel connected to the flow channel; an injection channel connected to the hydrodynamic focusing channel for injecting a sample into the hydrodynamic focusing channel; a first sheath fluid channel connected to the hydrodynamic focusing channel for delivering a first sheath fluid to a first part of the hydrodynamic focusing channel at a first flow rate; a second sheath fluid channel connected to the hydrodynamic focusing channel for delivering a second sheath fluid to a second part of the hydrodynamic focusing channel at a second flow rate; a light source proximate to the flow channel; a light detector proximate to the flow channel for detecting a core stream in the flow channel, wherein the core stream in the flow channel includes at least part of the sample injected by the injection channel; and a feedback control loop coupled to the detector for controlling a relative measure of the first and second flow rates in the first and the second sheath fluid channels, the feedback control loop adjusting a relative measure of the first flow rate and the second flow rate to move the position of the core stream in the flow channel to a desired position relative to the light detector.