Arrangement for monitoring fluid flow during intravenous supply to a patient
First Claim
1. An arrangement for monitoring the pressure of a fluid flowing through a pliant tubing, comprising:
- first means for applying force to at least two spaced apart portions of said tubing for causing said tubing to assume an elongate cross-section over a length of said tubing between said at least two spaced apart portions; and
second means for applying a pressure unrelated to the force applied by said first means to an area between said at least two spaced apart portions of said tubing within said length and responsive to movement of said area to provide indications of variations in the pressure of said fluid.
1 Assignment
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Accused Products
Abstract
An arrangement for monitoring the pressure of fluid flowing through pliant tubing forming part of a system for the intravenous supply of fluids to a patient under medical treatment in which the tubing is caused to assume an elongate cross-section and a linear voltage displacement transducer having a spring loaded plunger is arranged to apply pressure in a flattened region of the tubing wall to provide indications of contact area movement and thus variations in fluid pressure. Compensation for movement of the contact area after pressure is applied due other than to variations in pressure is provided by a sampler which regularly samples the output of tranducer and provides inputs to a comparator directly and via a shift register so that one sample is compared with an immediately preceding sample. If the difference exceeds the threshold of a threshold circuit, which is indicative of fluid pressure change, an alarm is sounded.
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Citations
20 Claims
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1. An arrangement for monitoring the pressure of a fluid flowing through a pliant tubing, comprising:
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first means for applying force to at least two spaced apart portions of said tubing for causing said tubing to assume an elongate cross-section over a length of said tubing between said at least two spaced apart portions; and second means for applying a pressure unrelated to the force applied by said first means to an area between said at least two spaced apart portions of said tubing within said length and responsive to movement of said area to provide indications of variations in the pressure of said fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device for monitoring the pressure of a fluid flowing through a plaint tubing, comprising:
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first means for applying force to at least two spaced apart portions of said tubing for causing said tubing to assume an elongate cross-section over a length of said tubing between said at least two spaced apart portions; and second means for applying a pressure unrelated to the force applied by said first means to an area between said at least two spaced apart portions of said tubing within said length and responsive to movement of said area to provide indications of variations in the pressure of said fluid. - View Dependent Claims (17, 18, 19, 20)
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Specification