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Infusion apparatus

  • US 4,355,638 A
  • Filed: 12/05/1979
  • Issued: 10/26/1982
  • Est. Priority Date: 12/08/1978
  • Status: Expired due to Term
First Claim
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1. Infusion apparatus operable by gravity, and comprising:

  • a solvent container for being suspended at a higher level than the infusion point;

    a drop chamber means beneath the container and connected to the container for infusion to drop through;

    an infusion needle;

    an infusion tube connecting the drop chamber means and the needle, the infusion tube being clampable for changing the cross-section thereof;

    a tube clamp means connected on the tube for clamping the tube to vary the cross-section thereof to a selected cross-section for controlling the normal gravity flow infusion rate;

    pressure increasing means connected externally of the tube at a portion of the tube between the tube clamp means and the needle;

    the pressure increasing means being selectively actuated in response to predetermined flow conditions in said tube for periodically increasing the pressure in the section of the tube between the tube clamp means and the needle and for thereafter permitting the pressure in that section of the tube to decrease by compressing and then releasing the tube at spaced time intervals.

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