Flow pulsatility dampening devices for closed-loop controlled infusion systems
First Claim
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1. A flow monitoring infusing system, comprising:
- a liquid pathway for containing a liquid pumped at a non-continuous fluid flow;
a dampening chamber in communication with the liquid pathway, the dampening chamber configured to hold a compressed gas that absorbs pressure fluctuations of the non-continuous fluid flow to smoothen the non-continuous fluid flow, wherein the compressed gas is in direct fluid communication with the pumped liquid; and
a fluid flow sensor disposed along the liquid pathway downstream of the dampening chamber to measure the flowrate of the smoothened fluid flow.
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Abstract
A flow monitoring infusion system that includes an infusion circuit having a fluid with a pulsatile fluid flow flowing therethrough. The infusion circuit includes a dampening element having a dampening chamber that absorbs the pressure fluctuations of the pulsatile fluid flow to transform the pulsatile fluid flow to a more smooth fluid flow. A fluid flow sensor that measures the flowrate of the more smooth fluid flow is disposed along the infusion circuit downstream of the dampening element.
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Citations
17 Claims
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1. A flow monitoring infusing system, comprising:
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a liquid pathway for containing a liquid pumped at a non-continuous fluid flow; a dampening chamber in communication with the liquid pathway, the dampening chamber configured to hold a compressed gas that absorbs pressure fluctuations of the non-continuous fluid flow to smoothen the non-continuous fluid flow, wherein the compressed gas is in direct fluid communication with the pumped liquid; and a fluid flow sensor disposed along the liquid pathway downstream of the dampening chamber to measure the flowrate of the smoothened fluid flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An infusion system comprising:
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a fluid pathway; an infusion pump for pumping a non-continuous flow of fluid through the fluid pathway; a generally tubular shaped member defining a chamber that is in communication with the fluid pathway, the chamber containing a compressed gas that absorbs pressure fluctuations of the non-continuous fluid to smoothen the non-continuous flow, wherein the compressed gas is in direct fluid communication with the non-continuous flow of fluid; a fluid flow sensor disposed along the fluid pathway downstream of the tubular shaped member, the flow sensor configured to measure a flowrate of the smoothened fluid flow, the fluid pathway extending from the pump, through the fluid sensor and downstream from an outlet of the fluid sensor; and a control member operable with the flow sensor and the infusion pump, the control member configured to receive flowrate information from the flow sensor and to adjust the infusion pump based on the flowrate information. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A flow monitoring infusing system, comprising:
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a fluid pathway for containing a fluid pumped at a non-continuous fluid flow; a dampening chamber in communication with the fluid pathway, the dampening chamber configured to hold a gas that absorbs pressure fluctuations of the non-continuous fluid flow to smoothen the non-continuous fluid flow, wherein the compressed gas is in direct fluid communication with the pumped fluid; and a fluid flow sensor disposed along the fluid pathway downstream of the dampening chamber to measure the flowrate of the smoothened fluid flow that flows through the fluid flow sensor.
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Specification