Syringe plunger driver system

Details Syringe plunger driver system Syringe plunger driver system

A - Human Necessities

61

M

A61M 5/145 (2006.01)

Patent

CA 2709450

A syringe plunger driver system is disclosed for accurately detecting force exerted against a syringe plunger. Each plunger has a plunger piston, a plunger flange, and a plunger stem interconnecting the piston with the flange, and each plunger forms a part of a syringe. Each syringe has a barrel in which the plunger moves, and each plunger flange has an inner side facing the syringe barrel and an. outer side. The syringe plunger driver system has a plunger driver adapted to move the syringe plunger into the syringe barrel in an operation mod.e. The syringe plunger driver system comprises a force concentrator located on the plunger driver that defines a pushing surface adapted to press against the outer side of the plunger flange to move the flange toward the barrel during the operation mode, whereby the force exerted against the plunger flange in operation mode is concentrated at the pushing surface of the force concentrator so that the force may be accurately detected. A force detector is located in the plunger driver and adapted to sense force exerted by the pushing surface against the plunger flange. The force detector outputs a force signal representative of the force exerted against the plunger flange. A plunger retainer is located on the plunger driver adapted to capture the plunger of the syringe. A bias device connected with the plunger retainer biases the plunger retainer into contact with the plunger flange.

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