Other

Queen's University at Kingston

Charles A Mulvenna

Timothy J Smith

Alois J Van Eyken

A pulsed liquid injection device for injection of predetermined dosage volumes of medication at predetermined intervals of time over an extended period is described. A relatively large supply of medication is maintained in a bag under pressure, and metered portions thereof are released at time intervals by an electronically controlled metering device. The metering device includes a simple valve arrangement containing three flexible resilient elements arranged and controlled in such a way as to provide shut off of medication supply in the event of a malfunction, either electrical or mechanical.

Ambulatory infusion pump

An energy transfer device comprising a tube coiled in the form of an open helix and anchored permitting bending of the tube about the axis of the helix. The tube is bent by being oscillated about the axis of the helix alternately increasing and decreasing the diameter of the helix resulting in a progressive change in axial tube velocity. This effectively squeezes and releases the fluid in the conduit causing the fluid to flow. Unidirectional flow is obtained by locating two one-way flow control valves in the flow path at respective ones of first and second positions spaced apart from one another and having the oscillated portion of the tube located between such valves. The amount of energy transferred is increased substantially when the system is tuned and this is accomplished by having the tube of selected length between the two flow control valves co-related to the fluid wave propagated along the tube with the velocity of sound in the fluid relative to the fluid. The squeezing or pressure increase in the fluid is transmitted along the fluid column at sound velocity until it is reflected by a restriction. The pressure increase then moves back along the fluid column past its starting point until it is again reflected by another restriction and when the system is perfectly tuned the wave arrives back at the starting point exactly one revolution later to be squeezed again.

Energy transfer device

The specification describes a fluid energy transfer device, comprising: a body means having at least one fluid chamber and fluid inlet and outlet passages for delivering fluid to and from the chamber; means for continuously accelerating the body means; whereby acceleration of the body means causing fluid flow inwardly and outwardly of the chamber and a change in fluid flow rate being effective to change the acceleration of the body means.

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Kingston, Canada

Charles A Mulvenna