Liquid Dosing Arrangement
First Claim
1. A liquid dosing arrangement, comprising:
- a liquid supply system comprising a first pressure sensor that measures a first pressure p1;
a liquid delivery system comprising a second pressure sensor that measures a second pressure p2; and
an injection valve between the liquid supply system and the liquid delivery system comprising a restricting member through which said liquid flows, and a pulsed opening and closing valve mechanism that operates said restricting member with opening pulses having frequency fo and width to, wherein the pressure drop Δ
p over the injection valve (2) is Δ
p=p1−
p2;
with the pressure drop Δ
p, and the dimensions (b, d1) of the restricting member in the injection valve making the velocity ν
of the liquid flowing through the restricting member sufficiently high to make the flow Φ
of liquid through the liquid delivery system essentially independent of the viscosity of the liquid.
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Accused Products
Abstract
A liquid dosing arrangement has a liquid supply system with a first pressure sensor for measuring a first pressure p1; a liquid delivery system, with a second pressure sensor for measuring a second pressure p2; and an injection valve, which is arranged so that the liquid is supplied through a restricting member in the injection valve and let through the restricting member by a pulsed opening and closing valve mechanism. The pressure drop, and the dimensions of the restricting member in the injection valve, are selected to make the velocity ν of the liquid flowing through the restricting member is high enough to make the flow of liquid through the liquid delivery system independent of the viscosity of the liquid.
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Citations
18 Claims
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1. A liquid dosing arrangement, comprising:
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a liquid supply system comprising a first pressure sensor that measures a first pressure p1;
a liquid delivery system comprising a second pressure sensor that measures a second pressure p2; and
an injection valve between the liquid supply system and the liquid delivery system comprising a restricting member through which said liquid flows, and a pulsed opening and closing valve mechanism that operates said restricting member with opening pulses having frequency fo and width to, wherein the pressure drop Δ
p over the injection valve (2) is Δ
p=p1−
p2;
with the pressure drop Δ
p, and the dimensions (b, d1) of the restricting member in the injection valve making the velocity ν
of the liquid flowing through the restricting member sufficiently high to make the flow Φ
of liquid through the liquid delivery system essentially independent of the viscosity of the liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. (canceled)
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12. A method of dosing liquid in a liquid dosing arrangement comprising a liquid supply system, a liquid delivery system, and an injection valve between the liquid supply system and the liquid delivery system, the method comprising the steps of:
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measuring a first pressure p1 in the liquid supply system with a first pressure sensor;
measuring a second pressure p2 in the liquid delivery system with a second pressure sensor; and
supplying liquid through a restricting member in the injection valve by a pulsed opening and closing valve mechanism with opening pulses having frequency fo and width to, the pressure drop Δ
p over the injection valve being Δ
p=p1−
P2; and
selecting the pressure drop Δ
p=p1−
p2 over the injection valve, and the dimensions (b, d1) of the restricting member in the injection valve, so that the velocity ν
of the liquid flowing through the restricting member insufficiently high to make the flow Φ
of liquid through the liquid delivery system essentially independent of the viscosity of the liquid. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An apparatus for intravenous infusion comprising
a liquid dosing arrangement comprising a liquid supply system comprising a first pressure sensor that measures a first pressure p1, a liquid delivery system comprising a second pressure sensor that measures a second pressure p2, and an injection valve between the liquid supply system and the liquid delivery system comprising a restricting member through which said liquid flows, and a pulsed opening and closing valve mechanism that operates said restricting member with opening pulses having frequency fo and width to, wherein the pressure drop Δ - p over the injection valve (2) is Δ
p=p1−
p2; and
a liquid delivery interface connected to said liquid delivery system and configured to interact with a patient to deliver said liquid to the patient.
- p over the injection valve (2) is Δ
Specification