| 摘要 |
A medication infusion pump includes a housing, a medication chamber defined within the housing, means for supplying the medication from the medication chamber to a patient, a reservoir defined within the housing and adapted to apply a predetermined negative pressure to a medication within the medication chamber, and a gas within the reservoir. The gas has a vapor pressure less than ambient atmospheric pressure at normal human physiological temperature, more specifically less than 14.7 psia at 37 .degree.C and wherein the gas is non-ozone depleting and non-toxic. The gas may be a mixture of gases with the net vapor pressure less than 14.7 psia at 37 .degree.C and more preferably less than about 10.7 psia at 37 .degree.C. The gas may be selected from the group of cyclopentane, dimethylbutane, 1,3-pentadiene and 2-methyl-2-butene or other branched chain fluoroalkanes and fluoroalkenes.
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