Topic
Progressive cavity pump
About: Progressive cavity pump is a research topic. Over the lifetime, 6045 publications have been published within this topic receiving 63212 citations.
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TL;DR: A new valveless fluid pump has been designed and tested that consists of two fluid diffuser/nozzle elements on each side of a chamber volume with an oscillating diaphragm that creates a one-way fluid flow.
Abstract: A new valveless fluid pump has been designed and tested. The pump consists of two fluid diffuser/nozzle elements on each side of a chamber volume with an oscillating diaphragm. The vibrating diaphragm produces an oscillating chamber volume, which together with the two fluid-flow-rectifying diffuser/nozzle elements, creates a one-way fluid flow. A micropump prototype with a chamber diameter of 19 mm with conical diffuser/nozzle elements has been built and tested. The maximum liquid flow rate is 16 ml/min and the maximum pump pressure is 2 m H 2 O. The pump frequency is of the order of 100 Hz.
717 citations
Patent•
10 Sep 1980
TL;DR: In this article, a small, accurate, reliable and economical pump which is particularly useful in intravenous (IV) feeding includes a disposable pump chamber and a pump housing, and the first and second cylinders in the pump housing are positioned to receive the first two flexible rolling diaphragms of the pump chamber.
Abstract: A small, accurate, reliable and economical pump which is particularly useful in intravenous (IV) feeding includes a disposable pump chamber and a pump housing. The disposable pump chamber has an inlet, an outlet, and first and second flexible rolling diaphragm pumping chambers. First and second cylinders in the pump housing are positioned to receive the first and second flexible rolling diaphragms of the disposable pump chamber. First and second pistons are movable in the first and second cylinders, respectively. In addition, first and second valves are provided in the pump housing. The first valve controls fluid flow between the inlet and the first flexible rolling diaphragm pump chamber, while the second valve controls fluid flow between the first flexible rolling diaphragm pumping chamber and the second flexible rolling diaphragm pumping chamber. A motor and cam shaft drive the first and second pistons and the first and second valves. The first and second valves are controlled so that one valve is closed at all times, thereby providing fail safe operation of the pump.
337 citations
TL;DR: A new planar fluid pump based on the valve-less diffuser/nozzle pump principle is presented, which shows pump flows and pump pressures which are more than twice as high as those of the in-phase oscillation mode.
Abstract: A new planar fluid pump based on the valve-less diffuser/nozzle pump principle is presented. The pump consists of two pump chambers, each with two flow rectifying diffuser/nozzle elements with rectangular cross sections, one at the inlet and one at the outlet. The pump chambers are arranged in parallel for high pump flow. Each pump chamber has two piezoelectrically vibrated diaphragms. The planar pump is fabricated in brass with a total thickness of 1 mm. The pump chamber diameter is 13 mm and the diffuser/nozzle element neck dimensions are 0.3×0.3 mm. Simplified theoretical analyses of the maximum pump flow and resonance frequency are given. The flow rectifying ability of the diffuser/nozzle elements is demonstrated in a stationary flow situation and the pump performance is verified in two different pump mode configurations: anti-phase and in-phase chamber volume excitation. The measurements in the anti-phase mode show pump flows and pump pressures which are more than twice as high as those of the in-phase oscillation mode. The anti-phase mode has a pump capacity of about 16 ml/min and a maximum pump pressure of about 1.7 m H2O with the pump diaphragm vibration frequency set to the pump resonance frequency of 540 Hz.
300 citations
Patent•
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04 Dec 2007
TL;DR: In this paper, a rotary pump with hydrodynamic and magnetic bearing mechanisms is described, where the first and second magnets are arranged proximate each other with their respective magnetic vectors opposing each other, which enables longer life pump operation and less damage to working fluids such as blood.
Abstract: Various “contactless” bearing mechanisms including hydrodynamic and magnetic bearings are provided for a rotary pump as alternatives to mechanical contact bearings. In one embodiment, a pump apparatus includes a pump housing defining a pumping chamber. The housing has a spindle extending into the pumping chamber. A spindle magnet assembly includes first and second magnets disposed within the spindle. The first and second magnets are arranged proximate each other with their respective magnetic vectors opposing each other. The lack of mechanical contact bearings enables longer life pump operation and less damage to working fluids such as blood.
273 citations
Patent•
03 Feb 1986
TL;DR: A positive pressure positive displacement implantable infusion pump as discussed by the authors is an implantable implantable pump that maintains infusate for delivery by a positive pressure displacement pump, which is drawn by the pump into a drug pressurant chamber.
Abstract: A positive pressure positive displacement implantable infusion pump. A positive pressure fluid reservoir maintains infusate for delivery by a positive pressure displacement pump. Infusate is drawn by the pump into a drug pressurant chamber. A check valve prevents backflow into the reservoir. The check valve may independently establish a basal flow rate by not completely sealing in the forward flow direction. The pump pulses to expel and fill the chamber thereby establishing the flow rate, basal or bolus through a restrictor interposed between the chamber and the infusion site. The pump may run in open loop, pre-programmed or externally programmed modes of operation.
253 citations