Controlling plunger drives for fluid injection in animals

Details Controlling plunger drives for fluid injection in animals Controlling plunger drives for fluid injection in animals

A - Human Necessities

61

M

A61M 5/20 (2006.01) A61M 5/145 (2006.01) A61M 5/172 (2006.01) A61M 5/44 (2006.01)

Patent

CA 2129284

A computer-controlled injector (40) of the type having a motor which advances and retracts a plunger (12) located within a syringe housing (10) toward and away from a nozzle located in the front of the syringe to inject fluid into or withdraw fluid out of an animal subject. Manual motion is induced by operating a manual motion control (44-48); 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.

Injecteur (40) commandé par ordinateur possédant un moteur qui avance et rétracte un piston (12) à l'intérieur du boîtier (10) d'une seringue, vers et depuis la busette située à l'avant de la seringue, afin d'injecter un liquide à un animal ou d'en retirer de cet animal. Une commande (44-48) actionne un mouvement manuel. L'opérateur peut manipuler la commande afin d'indiquer la direction et la vitesse de mouvement désirées. La commande de mouvement manuel comprend aussi un mode de blocage selon lequel le mouvement manuel du piston peut continuer une fois amorcé, sans que l'opérateur n'ait à continuer de manipuler la commande. L'injecteur effectue les injections selon un parmi plusieurs protocoles préprogrammés, et vérifie automatiquement le volume du fluide restant. L'injecteur compense pour les rallonges de piston, que l'on trouve dans certaines seringues partiellement remplies à l'avance, en assignant une valeur de correction enregistrée à la position de la seringue.

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