Coaxial lead screw drive syringe pump

Details Coaxial lead screw drive syringe pump Coaxial lead screw drive syringe pump

1991-09-06

1993-06-15

Kashnikow, Andres

Dispensing

With discharge assistant

Insertable cartridge or removable container

222333, 222390, 604155, G01F 1106

Patent

active

052190994

ABSTRACT:
A syringe pump, uses a stepping motor to rotate a lead screw with precision and in turn advance a zero-backlash ball nut or vice-versa to drive the syringe plunger. This invention is designed to eliminate virtually all forces that are not coaxially aligned with the plunger's axis by utilizing a drive shaft kinematically supported on a reference member. The barrel of the syringe is kinematically supported on the reference member with its axis aligned with the axis of the drive shaft. The drive shaft is advanced by the ball nut and drive shaft assembly to drive the plunger which is kinematically supported at one end by the end of the drive shaft and at the other end by the internal wall of the barrel.

REFERENCES:
patent: 2498672 (1950-02-01), Glass
patent: 2627270 (1933-02-01), Glass
patent: 3336925 (1967-08-01), Thompson III
patent: 3390815 (1968-07-01), Kavan et al.
patent: 3425416 (1969-02-01), Loughry
patent: 3674009 (1972-07-01), Williamson
patent: 3799406 (1974-03-01), St. John et al.
patent: 4335834 (1982-06-01), Zepkin
patent: 4731058 (1988-03-01), Doan
patent: 4769009 (1988-09-01), Dykstra
patent: 4848606 (1989-07-01), Taguchi et al.
Materials and Processes in Manufacturing, fifth edition E. Paul DeGarmo, P. E. Macmillan Publishing copyright 1979.
IBM Technical Disclosure Bulletin Paste dispenser, vol. 16, No. 7, Dec. 1973.

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