Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-12-21
1998-09-15
Rimell, Sam
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604131, A61M 3700
Patent
active
058073370
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to apparatus for infusing a liquid into a subject for infusion at a constant pressure and, more particularly, to apparatus for infusing a medicinal liquid into a human or animal body.
BACKGROUND ART
In infusing into the body of a patient a medicinal liquid such as a transfusion liquid (nutritive agent), an anticoagulant and a carcinostatic agent, a constant quantity of the medicinal liquid is sometimes desired to be infused over a long time.
To infuse a medicinal liquid continuously at a constant flow rate, there are conventionally used an electrically-driven syringe pump and a balloon infuser.
The electrically-driven syringe pump in general is heavy and hence is impossible to be moved as a patient moves. In addition, it is complicated in structure and expensive.
The balloon infuser is adapted to infuse a medicinal liquid by utilizing a contraction force of a balloon expanded by the medicinal liquid loaded therein to spout the medicinal liquid. Such an arrangement does not necessarily ensure a constant spouting pressure from the beginning to end of the contraction of the balloon. In addition, balloons usable for the balloon infuser are expensive. For these reasons the balloon infuser is also costly though is lighter than the electrically-driven syringe pump.
It is, therefore, an object of the present invention to provide a liquid infusion apparatus which is simple in structure and hence can be easily manufactured at reduced cost, while ensuring a constant spouting pressure regardless of the quantity of a liquid to be spouted.
DISCLOSURE OF THE INVENTION
To attain the foregoing object, the following technical means are taken in the present invention.
That is, according to the present invention there is provided a liquid infusion apparatus comprising: a casing having a load chamber to be loaded with a liquid; a movable member forming part of a wall of the load chamber and adapted to reciprocate with respect to the casing to vary the volume of the load chamber; a cylinder integrally coupled to the casing or the movable member; a piston axially slidably and airtightly fitted in the cylinder; the casing being formed with an injection port and a spouting port which communicate with the load chamber; the cylinder and the piston defining an airtight cylinder chamber in a vacuum condition when the piston is moved in the direction away from the cylinder; and the movable member and the piston being cooperatively interconnected through a cooperative means so as to decrease the volume of the load chamber in proportion to a decrease in the volume of the cylinder chamber.
In the liquid infusion apparatus, the movable member may be slidably and liquid-tightly fitted in the casing; the load chamber may be a space closed by the movable member and the casing; and the casing may be transparent or translucent. Such an arrangement allows the amount of the liquid remaining in the load chamber to be readily measured by visual observation.
According to the present invention, there is also provided a liquid infusion apparatus comprising: a flexible container defining therein a load chamber to be loaded with a liquid, the flexible container being expansible and retractable so as to vary the volume of the load chamber; a casing provided at one end of the flexible container in the direction of expansion-retraction of the flexible chamber; a movable member provided at the other end of the flexible chamber and adapted to reciprocate with respect to the casing so as to vary the volume of the load chamber; a cylinder integrally coupled to the casing or the movable member; a piston axially slidably and airtightly fitted in the cylinder; the flexible container being formed with an injection port and a spouting port which communicate with the load chamber; the cylinder and the piston defining an airtight cylinder chamber in a vacuum condition when the piston is moved in the direction away from the cylinder; and the movable member and the piston being cooperatively interconnected through a
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Yamada Keiichi
Yamanaka Junichi
Daiken Iki Co., Ltd.
Racunas Robert V.
Rimell Sam
Safran David S.
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