A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 5/142 (2006.01) A61M 5/36 (2006.01)
Patent
CA 2683203
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, 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; (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, said elastomeric membrane comprising an inlet valve flap and an outlet valve flap, both of which depend from the undersurface of the elastomeric membrane, the inlet valve flap when closed by a fluid pressure within the pumping chamber forming a seal against an inlet valve surface that is formed in the base and is disposed between the inlet passage and the pumping chamber, and the outlet valve flap when closed, forming a seal against an outlet valve surface that is formed in the base and is disposed between the pumping chamber and the outlet passage; and (c) means for reducing an audible noise that is otherwise caused by an oscillation of at least one of the inlet valve flap and the outlet valve flap in response to a flow of medicinal liquid through the cassette.
Brose Robert
Defenbaugh Scott M.
Gjata John D.
Johnston David
Lawless Mike W.
Hospira Inc.
Mbm Intellectual Property Law Llp
LandOfFree
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