Patent ID: 8814830
Filing Date: 2014-08-26
Classification: A61M,Y10T

Abstract:
1. A syringe plunger driver system for accurately measuring a force exerted against a syringe plunger by a plunger driver, the plunger having a plunger piston, a plunger flange, and a plunger stem interconnecting the piston with the flange, and the plunger forming a part of a syringe, the syringe having an outlet and a barrel in which the plunger moves, the syringe plunger driver system comprising: a force concentrator including a protruding pushing surface located on the plunger driver such that the plunger flange contacts the plunger driver at the protruding pushing surface, the force concentrator adapted to exert a force against the plunger flange to move the plunger into the syringe barrel; a force detector located in the plunger driver and adapted to measure the magnitude of the force exerted by the force concentrator against the plunger flange, the force detector outputting a force signal representative of the measured magnitude of the force; and a moveable flange contact plate, comprising the force concentrator, pivotally mounted about a pivot point on the plunger driver, and the force detector engaging the contact plate between the pivot point and the force concentrator.