The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2009
Filed:
Jan. 15, 2004
Norio Harui, Seattle, WA (US);
Michael A. Crawford, Auburn, WA (US);
Richard J. Esposito, Seattle, WA (US);
William E. Ortyn, Bainbridge Island, WA (US);
Norio Harui, Seattle, WA (US);
Michael A. Crawford, Auburn, WA (US);
Richard J. Esposito, Seattle, WA (US);
William E. Ortyn, Bainbridge Island, WA (US);
Amnis Corporation, Seattle, WA (US);
Abstract
A low pulsatility syringe pump including a duplex bearing set rotatingly supporting a lead screw, and a transmission having a first drive train configured to increase a number of motor rotations required for a single rotation of the lead screw, and a second drive train configured to reduce the number of motor rotations required for a single rotation of the lead screw as compared to the first drive train. Another embodiment also includes a motor configured to rotate the syringe about its own axis, independent of the motion of the lead screw. In this other embodiment, the fluid in the syringe barrel includes objects (such as cells, latex beads, etc.) entrained in the fluid. The rate of rotation (e.g., about three revolutions per second) is chosen such that each object traces a substantially circular pathway in the syringe barrel and remains in suspension.