초록 ▼

A plastic pump piston is provided for a disposable syringe, wherein the disposable syringe has a syringe cylinder which is constructed with a needle cone on one end thereof and at least one gripping plate on the other end thereof, and having a sealing element on the front end of a shaft of the pump

A plastic pump piston is provided for a disposable syringe, wherein the disposable syringe has a syringe cylinder which is constructed with a needle cone on one end thereof and at least one gripping plate on the other end thereof, and having a sealing element on the front end of a shaft of the pump piston. The sealing element is made of a material having a higher elasticity than the pump piston material and is molded onto the pump piston in the same mold after the pump piston is injection molded.

대표청구항 ▼

1. A plastic pump piston for a disposable syringe, comprising: a syringe cylinder having a needle cone on a front end of the cylinder and at least one gripping plate on a rear end of the cylinder; a shaft having a seal receptacle on a front end of the shaft and a press plate on a rear end of the

1. A plastic pump piston for a disposable syringe, comprising: a syringe cylinder having a needle cone on a front end of the cylinder and at least one gripping plate on a rear end of the cylinder; a shaft having a seal receptacle on a front end of the shaft and a press plate on a rear end of the shaft, wherein the shaft, press plate and seal receptacle are injection molded from a first plastic material as one piece; and an elastic sealing element comprising a second plastic material having a higher elasticity than the first plastic material, wherein the sealing element is non-releasably injection molded onto the sealing receptacle as a second piece. 2. The pump piston according to claim 1, wherein the seal receptacle comprises a cone or a disc-shaped plate, which carries the sealing element. 3. The pump piston according to claim 2, wherein the sealing element completely surrounds or covers the disc-shaped plate. 4. The pump piston according to claim 2, wherein the sealing element is connected to a periphery of the plate. 5. The pump piston according to claim 4, wherein the sealing element is formed in a surrounding groove in the periphery of the plate and has a round cross-section. 6. The pump piston according to claim 1, wherein the shaft has at least one first injection molding channel running radially through a rib of the pump piston, and the channel is filled with the second plastic material for the sealing element. 7. The pump piston according to claim 1, wherein the shaft has a second injection molding channel running axially of the pump piston, and the channel is filled with the second plastic material for the sealing element.