Becton Dickinson and Company Limited

Thomas J. Dragosits

Lennox Watts

Steven Doumanis

Thomas J Dragosits

Lennox O Watts

An operable syringe assembly comprises a barrel including a cylindrical coextruded body portion having a longitudinal axis. The body portion forms a side wall spaced from the axis defining a chamber for retaining fluid. The body portion includes an open proximal end and a distal end and further includes an inner portion of plastic material and a rigid portion of plastic material surrounding the inner portion. The rigid portion has a higher hardness than the inner portion. A plunger including an elongate shaft portion having a proximal end, a distal end and a rigid piston at the distal end is provided. The piston has an outside diameter greater than the inside diameter of the inner portion and a higher hardness than the inner portion. The piston portion is slidably positioned in fluid-tight engagement inside the barrel. The fluid-tight engagement is caused by the piston compressing the inner portion of the plastic material of the coextruded body portion. The proximal end of the plunger extends outwardly from the open proximal end of the barrel to facilitate moving the piston portion with respect to the barrel.

Syringe assembly

An operable syringe assembly comprises a barrel including a cylindrical body portion having a longitudinal axis. The body portion forms a side wall spaced from the axis defining a chamber for retaining fluid. The body portion includes an open proximal end and a distal end and further includes an inner barrel portion and an outer barrel portion surrounding and in spaced relationship with the inner barrel portion. The outer barrel portion is held in spaced relation with the inner barrel portion by at least one longitudinally oriented rib connecting the outer barrel portion and the inner barrel portion. A plunger including an elongate shaft portion having a proximal end, a distal end and a rigid piston at the distal end is provided. The piston has an outside diameter greater than the inside diameter of the inner barrel portion. The piston portion is slidably positioned in fluid-tight engagement inside the barrel. The fluid-tight engagement is caused by the piston portion deflecting the inner barrel portion of the body portion. The proximal end of the plunger extends outwardly from the open end of the barrel to facilitate moving the piston portion with respect to the barrel.

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Valley Cottage, NY, United States of America

Thomas J Dragosits