A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 5/142 (2006.01)
Patent
CA 2683199
A cassette that is adapted to engage a drive mechanism, for use in infusing a medicinal liquid into a patient, comprising:(a) a housing having a base on which is mounted a facing member, a fluid path being defined at least in part by the base and extending through the cassette between an inlet port and an outlet port of the cassette, said fluid path including: (i) an inlet passage coupled in fluid communication with the inlet port; (ii) an outlet passage coupled in fluid communication with the outlet port; and (iii) a pumping chamber disposed between the inlet passage and the outlet passage; and (b) an elastomeric membrane that extends over the fluid path and when displaced into the pumping chamber, is adapted to force a fluid from the pumping chamber,; in one embodiment the casseytte further includes (c) means for reducing a volume of air retained within said pumping chamber when said elastomeric membrane is displaced into the pumping chamber during a pumping cycle; in another embodiment the elastomeric membrane has a generally planar undersurface facing toward the base, but including two lobes of increased thickness disposed above the pumping chamber at opposite sides thereof and extending into the pumping chamber, so that when the elastomeric diaphragm is displaced into the pumping chamber by a drive mechanism, the lobes sweep away air bubbles that may be retained on adjacent sides of the pumping chamber, said lobes defining a shallow elongate path through the pumping chamber when the elastomeric membrane is displaced to its full extent into the pumping chamber, so that a substantial portion of any air contained within the pumping chamber is carried out of the pumping chamber with the medicinal liquid being infused.
Brose Robert
Defenbaugh Scott M.
Gjata John D.
Johnston David
Lawless Mike W.
Hospira Inc.
Mbm Intellectual Property Law Llp
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