| 摘要 |
There are depicted two embodiments of an ambulatory disposable infusion delivery system in which fluid (drug) is fed to a substantially transparent receiving and retaining housing which has indicia markings conventionally applied to indicate quantity. The inflow of fluid causes an elastomeric member attached to a piston, which is slideable in a bore in this housing, to be moved, thus stretching this member. This tension provides an energy source (force) to push the fluid out of the bore when the connected tubing line is opened. The housing is provied with a discharge fluid conduit and a restrictor controlling the rate of flow. In both embodiments, the housing has a barrel with a substantially constant bore. The slideable piston in this bore has a resilient outer portion with at least two ribs providing sealing action while having a low coefficient of friction. The front wall of the housing may be curved or straight and provides a fluid outlet as well as an aperture in which one end of a stretched elastomeric member is secured. The other end of this stretched member is secured to the slideable piston. Filling of the housing may be through a one-way valve or resilient plug. The controlling restrictor may be mounted and secured in the discharge tubing. This tubing may include a luer lock connector.
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