초록 ▼

A medication infusion pump is provided for substantially constant flow delivery of a selected medication from a medication chamber through a catheter to a patient. The medication infusion pump comprises a compact housing adapted for implantation into the body of a patient, wherein the housing define

A medication infusion pump is provided for substantially constant flow delivery of a selected medication from a medication chamber through a catheter to a patient. The medication infusion pump comprises a compact housing adapted for implantation into the body of a patient, wherein the housing defines a hollow interior forming a medication chamber. An inlet port on the housing permits transcutaneous access to and filling of the medication chamber within the housing. A flexible propellant reservoir occupies a portion of the medication chamber volume and is filled with a selected fluid propellant to apply a substantially constant pressure to the medication for medication delivery with substantially constant flow through an elongated capillary tube and the catheter for administration to the patient. The capillary tube is spooled within the housing at the perimeter thereof in association with an annular filter of large surface area to prevent impurities and particulate from entering and potentially clogging the capillary tube. The inlet port also includes a click plate for providing a positive feedback indication of proper registration between the inlet port and a refill needle for refilling the medication chamber.

대표청구항 ▼

[ What is claimed is:] [1.] A medication infusion pump, comprising:a housing formed to define a hollow housing interior, said hollow housing interior forming a medication chamber for receiving a selected medication;an inlet port mounted on said housing and adapted for removable reception of a refill

[ What is claimed is:] [1.] A medication infusion pump, comprising:a housing formed to define a hollow housing interior, said hollow housing interior forming a medication chamber for receiving a selected medication;an inlet port mounted on said housing and adapted for removable reception of a refill needle to permit delivery of the medication into said medication chamber;a propellant reservoir positioned within said medication chamber, said propellant reservoir comprising a sealed flexible bag with a selected fluid propellant therein to apply a predetermined positive pressure to medication within said medication chamber;a flow restrictive element, said flow restrictive element having a first end in flow communication with medication within said medication chamber; andan outlet port fitting being coupled in flow communication with a second end of said flow restrictive element for substantially constant delivery of medication passing through said flow restrictive element to a patient,wherein the sealed flexible bag is formed from an upper flexible sheet of material connected to a lower sheet, wherein the sealed flexible bag has a size and shape to conform and substantially entirely fill the medication chamber in the absence of medication within the medication chamber, and wherein the upper flexible sheet of the sealed flexible bag progressively collapses to a reduced volumetric size upon introduction of medication into the medication chamber to a substantially minimum volumetric size permitting substantially all of the medication chamber to be filled with medication.