초록 ▼

Failsafe apparatus and method are disclosed for controlling fluid flow from syringes. One or more syringes are positioned so that the piston of each syringe is caused to be precisely displaced to thereby safely deliver medicament from the syringe to a patient. To effect movement of each piston, a ra

Failsafe apparatus and method are disclosed for controlling fluid flow from syringes. One or more syringes are positioned so that the piston of each syringe is caused to be precisely displaced to thereby safely deliver medicament from the syringe to a patient. To effect movement of each piston, a rack is provided, either as a part of the piston or secured thereto, and longitudinal movement of each rack is effected by rotating an associated pinion gear that is connected with a pulse-driven, stepper motor utilized in a power-efficient electromechanical configuration, with the operation of the stepper motor being accomplished through dual-redundant state machines controlled by a pre-programmed memory unit, and with the apparatus being repeatedly subjected to a plurality of error checks and data integrity verifications to assure continued proper operation.

대표청구항 ▼

A compact device for controlling delivery of fluid from a syringe having a piston the movement of which in a predetermined direction causes said fluid to be expelled from said syringe, said device comprising: a stepper motor having a rotatable motor shaft; pulse generating means including first and

A compact device for controlling delivery of fluid from a syringe having a piston the movement of which in a predetermined direction causes said fluid to be expelled from said syringe, said device comprising: a stepper motor having a rotatable motor shaft; pulse generating means including first and second state machines operating in parallel with respect to one another and connected in common with said stepper motor to provide pulses thereto, when said first and second state machines provide like outputs, for causing rotation of said motor shaft by increments, said first and second state machines including error monitoring means for monitoring said device to determine error in delivery of fluid from said syringe and precluding application of pulses to said stepper motor when said error is determined by said error monitoring means to thereby enhance safe delivery of fluid from said syringe; and motion translation means connected with said motor shaft and adapted to be connected with said piston for causing movement of said piston in said predetermined direction in response to said incremental rotation of said motor shaft.