Liebel-Flarsheim Company LLC

Kenneth J Niehoff

A computer-controlled injector of the type having a motor which advances and retracts a plunger located within a syringe housing toward and away from a nozzle located in the front of the syringe to inject fluid into or out of an animal subject. Manual motion is induced by operating a manual motion control; the operator can manipulate the control to indicate the desired direction and velocity of motion. The manual motion control also has a locking mode in which manual motion of the plunger will continue once initiated without requiring the operator to continue manipulating the manual motion control. The injector performs injections in accordance with one of several pre-programmed protocols, and automatically tracks the fluid volume remaining. The injector compensates for plunger extenders found in some partially pre-filled syringes by applying a stored offset value to the computed plunger position.

Controlling plunger drives for fluid injections in animals

A computer-controlled injector of the type having a motor which advances and retracts a plunger located within a syringe housing toward and away from a nozzle located in the front of the syringe to inject fluid into or out of an animal subject. The injector includes a display for querying the operator as to operating parameters for an injection, such as the capacity of the syringe, prior to an injection. The injector may be configured so as to generate a different sequences of displays prior to an injection, e.g., to not include a query as to the syringe capacity if the injector will not be used with syringes of differing capacities.

A computer-controlled injector of the type as a motor which advances and retracts a plunger located within a syringe housing toward and away from a nozzle located in the front of the syringe to inject fluid into or out of an animal subject. The injector tracks the plunger position during an injection, and compensates for plunger extenders found in partially pre-filled syringes by applying a stored offset value to the computed plunger position, to produce a corrected plunger position reflecting the actual position of the plunger and compensating for the presence of the extender. The offset value can be determined by querying the operator as to the capacity of the syringe and determining therefrom the appropriate offset value, or may be automatically computed by detecting physical indicia on the syringe or extender which indicate the length of the extender.

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Cincinnati, OH, United States of America

Kenneth J Niehoff