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Medical liquid infusion apparatus

  • US 7,867,198 B2
  • Filed: 08/05/2005
  • Issued: 01/11/2011
  • Est. Priority Date: 08/16/2004
  • Status: Expired due to Fees
First Claim
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1. A medical liquid infusion apparatus provided with a driving portion and configured to infuse a medical liquid inside a medical liquid container into a patient by applying a pressure to the medical liquid container using a driving force of the driving portion, wherein:

  • the driving portion includes a compressed gas cylinder filled with a compressed gas alone, and the driving force is generated by a pressure inside the compressed gas cylinder, the compressed gas cylinder including an on-off valve configured to close the compressed gas cylinder using a pressure of the compressed gas, when no external force is conferred thereto,wherein the driving portion further includes;

    a main body portion allowed to communicate with an interior of the compressed gas cylinder by opening the on-off valve;

    a diaphragm valve that defines a compression chamber capable of sealing the compressed gas flown from the compressed gas cylinder in a space between the main body portion and the medical liquid container;

    a pushing member that pushes the diaphragm valve toward the compression chamber from an outside open to atmosphere; and

    a link member that allows the on-off valve and the diaphragm valve to operate in synchronization with each other in such a manner that a first resultant force obtained by adding a force to close the on-off valve and a force to expand the diaphragm valve outward using the pressure inside the compression chamber is balanced out with a second resultant force to push the diaphragm valve toward the compression chamber using an atmospheric pressure and a pushing force of the pushing member, andwherein the pressure inside the compression chamber is used as the driving force.

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