Syringe pump
AssigneeFluid Metering, Inc.
InventorDavid Lionel Rawlings
Life of this patent
Estimating the term…
Abstract
A syringe pump for aspirating and dispensing fluids is provided. The syringe pump includes a pump casing having an inlet port and an outlet port, a ceramic piston liner received within the pump casing and a ceramic piston. The liner has an internal bore formed by a cylindrical wall, wherein the cylindrical wall further defines a fluid path between the inlet port and the outlet port of the pump casing. The piston is axially movable within the bore of the piston to urge a flow of fluid between said inlet port and said outlet port via said fluid path.
Claims11
A syringe pump for aspirating and dispensing fluids, the syringe pump comprising:
- a pump casing having an inlet port and an outlet port;
- a ceramic piston liner received within the pump casing, the piston liner having an internal bore formed by a cylindrical wall, the cylindrical wall further defining a fluid path between the inlet port and the outlet port of the pump casing;
- a ceramic piston axially movable within said bore of said piston liner to urge a flow of fluid between said inlet port and said outlet port via said fluid path;
- an annular cartridge seal circumferentially sealing an outer surface of said ceramic piston at a proximal end of said ceramic piston liner;
- an annular scraper seal disposed adjacent the annular cartridge seal, the annular scraper seal comprising a lip portion positioned against the outer surface of the piston and an energizer element positioned in an annular groove, the annular groove opening in a direction away from an interior of the pump casing;
- and
- a gland nut connected to an inner surface of said pump casing and attached at a proximal end thereof, said gland nut retaining said annular cartridge seal and said annular scraper seal in engagement with the piston.
A syringe pump for aspirating and dispensing fluids, the syringe pump comprising:
- a pump casing having an inlet port and an outlet port;
- a ceramic piston liner received within the pump casing, the piston liner having an internal bore formed by a cylindrical wall, the cylindrical wall further defining a fluid path between the inlet port and the outlet port of the pump casing;
- a ceramic piston axially movable within said bore of said piston liner to urge a flow of fluid between said inlet port and said outlet port via said fluid path;
- an annular cartridge seal circumferentially sealing an outer surface of said ceramic piston at a proximal end of said ceramic piston liner;
- an annular scraper seal disposed adjacent the annular cartridge seal;
- and
- a gland nut attached to a proximal end of said pump casing, said gland nut retaining said annular cartridge seal and said annular scraper seal in engagement with the piston, the gland nut comprising a stepped structure in which a first face retains the annular cartridge seal and a second face retains the annular scraper seal.
A syringe pump for aspirating and dispensing fluids, the syringe pump comprising:
- a pump casing having an inlet port and an outlet port;
- a ceramic piston liner received within the pump casing, the piston liner having an internal bore formed by a cylindrical wall, the cylindrical wall further defining a fluid path between the inlet port and the outlet port of the pump casing;
- a ceramic piston axially movable within said bore of said piston liner to urge a flow of fluid between said inlet port and said outlet port via said fluid path;
- an annular cartridge seal circumferentially sealing an outer surface of said ceramic piston at a proximal end of said ceramic piston liner;
- an annular scraper seal disposed adjacent the annular cartridge seal, the annular scraper seal comprising a lip portion positioned against the outer surface of the piston and an energizer element positioned in an annular groove, the annular groove opening in a direction away from an interior of the pump casing;
- an annular elastomeric washer positioned between the annular cartridge seal and the annular scraper seal;
- and
- a gland nut attached to a proximal end of said pump casing, said gland nut retaining said annular cartridge seal and said annular scraper seal in engagement with the piston.
Dependencies are inferred from the claim text.