Continuous liquid infusion device
First Claim
1. A continuous liquid infusion device, comprising:
- a first structure having a vacuum pump barrel which has an open/close valve at its front end and an open rear end, a piston fitted into the vacuum pump barrel air-tightly, a stopper capable of locking the piston at the rear end of the vacuum pump barrel against atmospheric pressure, and a pusher movable in the same direction as that of the piston outside the vacuum pump barrel; and
a second structure having a liquid syringe which has a liquid port at its front end and an open rear end, and a piston fitted into the liquid syringe liquid-tightly, whereinsaid first structure and said second structure are removably connected, andsaid first structure and said second structure are connectable in a state in which the front end of the vacuum pump barrel of said first structure extends further forward than the front end of the liquid syringe.
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Accused Products
Abstract
The invention relates to a continuous liquid infusion device which can be easily prepared for operation with small force, and can infuse liquid at constant infusion rate and amount over a long time. It comprises a liquid syringe section and a driving pump section mounted on the liquid syringe section, wherein sliding the pressing arm of the driving pump section upward leads to axially slides the piston in the negative pressure chamber to produce a negative pressure therein; and using returning force of the piston under the negative pressure, the liquid pushout plunger barrel is biased toward the upper edge of a pressing member through a locking member engaged with the piston so as to push out liquid in the liquid syringe from the liquid infusion port. Further, only the liquid syringe is disposable while the vacuum pump barrel on the driving side is good for repeated use (reusable).
36 Citations
8 Claims
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1. A continuous liquid infusion device, comprising:
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a first structure having a vacuum pump barrel which has an open/close valve at its front end and an open rear end, a piston fitted into the vacuum pump barrel air-tightly, a stopper capable of locking the piston at the rear end of the vacuum pump barrel against atmospheric pressure, and a pusher movable in the same direction as that of the piston outside the vacuum pump barrel; and a second structure having a liquid syringe which has a liquid port at its front end and an open rear end, and a piston fitted into the liquid syringe liquid-tightly, wherein said first structure and said second structure are removably connected, and said first structure and said second structure are connectable in a state in which the front end of the vacuum pump barrel of said first structure extends further forward than the front end of the liquid syringe. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A continuous liquid infusion device for the transfusion of drug or chemical solution, such as anesthesia compounds and analgesic preparation, into patients'"'"' bodies, comprising:
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a first structure having a vacuum pump barrel which has an open/close valve at its front end and an open rear end, a piston fitted into the vacuum pump barrel air-tightly, a stopper capable of locking the piston at the rear end of the vacuum pump barrel against atmospheric pressure, and a pusher movable in the same direction as that of the piston outside the vacuum pump barrel; and a second structure having a liquid syringe, having the drug or chemical solution pre-stored therein, which has a liquid port at its front end and an open rear end, and a piston fitted into the liquid syringe liquid-tightly, wherein said first structure and said second structure are removably connected, and a vacuum is generated manually in the vacuum pump barrel, whereby atmospheric pressure drives the piston inside the vacuum pump barrel.
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Specification