FLOW REGULATOR FOR INFUSION PUMP AND METHOD OF MANUFACTURING THE SAME
First Claim
1. A drug infusion flow regulating apparatus comprising:
- an inlet configured to receive liquid into the apparatus;
an outlet configured to discharge the liquid from the apparatus;
a cylinder assembly comprising a first cylinder, a second cylinder and a third cylinder that are arranged substantially coaxially along an axial direction;
the first cylinder comprising a first interior surface;
a continuous spiral thread formed into the first interior surface of the first cylinder;
the second cylinder fitted into the first cylinder and comprising a second interior surface and a second exterior surface;
a spiral liquid-flow channel formed between the first cylinder and the second cylinder through the continuous spiral thread, the spiral liquid-flow channel being in fluid communication with the inlet;
a plurality of longitudinal grooves extending substantially parallel to the axial direction and formed into the second cylinder on the side of the second interior surface;
a plurality of through-holes formed in the second cylinder and in fluid communication with the spiral liquid-flow channel;
the third cylinder fitted into the second cylinder and comprising a third exterior surface;
a plurality of independent liquid-flow passages formed between the second cylinder and the third cylinder, wherein each of the plurality of independent liquid-flow passages is in fluid communication with the spiral liquid-flow channel via at least one of the plurality of through-holes; and
a diaphragm valve configured to regulate fluid communication between the spiral liquid-flow channel and the outlet.
1 Assignment
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Accused Products
Abstract
An ambulatory drug infusion system includes a disposable ambulatory infusion pump and a flow regulator for regulating flow of the drug supplied from the disposable ambulatory infusion pump. The flow regulator includes a cylinder assembly of first, second and third cylinders arranged coaxially. The flow regulator includes a continuous spiral liquid-flow channel formed between the first cylinder and the second cylinder fitted into the first cylinder. The regulator includes bypass through-holes in communication with the spiral channel and formed in the second cylinder. The regulator further includes liquid-flow passages formed between the second cylinder and the third cylinder fitted into the second cylinder. The through-holes are in communication with the passages, respectively. One of the passages can be selected to choose a predetermined flow rate. The regulator further includes a diaphragm valve which can regulate fluid communication between the spiral liquid-flow channel and an outlet.
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Citations
20 Claims
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1. A drug infusion flow regulating apparatus comprising:
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an inlet configured to receive liquid into the apparatus; an outlet configured to discharge the liquid from the apparatus; a cylinder assembly comprising a first cylinder, a second cylinder and a third cylinder that are arranged substantially coaxially along an axial direction; the first cylinder comprising a first interior surface; a continuous spiral thread formed into the first interior surface of the first cylinder; the second cylinder fitted into the first cylinder and comprising a second interior surface and a second exterior surface; a spiral liquid-flow channel formed between the first cylinder and the second cylinder through the continuous spiral thread, the spiral liquid-flow channel being in fluid communication with the inlet; a plurality of longitudinal grooves extending substantially parallel to the axial direction and formed into the second cylinder on the side of the second interior surface; a plurality of through-holes formed in the second cylinder and in fluid communication with the spiral liquid-flow channel; the third cylinder fitted into the second cylinder and comprising a third exterior surface; a plurality of independent liquid-flow passages formed between the second cylinder and the third cylinder, wherein each of the plurality of independent liquid-flow passages is in fluid communication with the spiral liquid-flow channel via at least one of the plurality of through-holes; and a diaphragm valve configured to regulate fluid communication between the spiral liquid-flow channel and the outlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification