摘要:
A device for delivering a liquid including a pump, and an anti-siphon valve external to the pump is disclosed. The anti-siphon valve includes an inlet channel connected to the outlet duct of the pump, and an outlet channel, between which a seat and a moving member are disposed that are suitable for co-operating together and that define, between the inlet channel and the outlet channel, a leaktight liquid flow zone. The moving member is suitable for going from an opening position making it possible for liquid to flow through the flow zone, to a closure position in which the moving member comes into contact with the seat of the valve and prevents any flow through the flow zone, the moving member being subjected to the pressure of a reference chamber that is not in fluid communication with the outlet channel.
摘要:
The invention relates to a device for delivering a liquid, which device comprises a pump, and an anti-siphon valve external to the pump and having an inlet channel connected to the outlet duct of the pump, and an outlet channel, between which channels a seat and a moving member are disposed that are suitable for co-operating together and that define, between the inlet channel and the outlet channel, a leaktight liquid flow zone, said moving member being suitable for going from an opening position making it possible for liquid to flow through said flow zone, to a closure position in which the moving member comes into contact with the seat of the valve and prevents any flow through said flow zone, said moving member being subjected to the pressure of a reference chamber that is not in fluid communication with the outlet channel. Application to obtaining a pump for injecting liquid medication.
摘要:
A micropump in the form of a stack comprising, in succession, a flexible diaphragm, a pumping chamber and a closing-off plate, said pumping chamber communicating with the outside, for example via the flexible diaphragm; said diaphragm being furthermore secured to an actuator arranged outside the micropump, characterized in that said diaphragm is secured to the actuator by way of at least one element in the form of a strip, which is rigid along its main axis and flexible in the direction perpendicular to its main axis.
摘要:
The invention concerns a pumping device that includes a pump having a pumping chamber with a variable volume, an inlet that communicates with the pumping chamber and a valve, an outlet that communicates with the pumping chamber and a valve, and an actuator adapted to change the volume of the pumping chamber. A fluidic pathway in the pumping device includes the inlet, the pumping chamber, the outlet, and a downstream line situated downstream of the outlet valve. The pumping device also includes a pressure sensor for measuring the pressure between the valves of the pathway, and a processing means for processing the received pressure data from the pressure sensor. The invention also concerns a method for detecting a dysfunction in the pumping device.
摘要:
A micropump in the form of a stack comprising, in succession, a flexible diaphragm, a pumping chamber and a closing-off plate, said pumping chamber communicating with the outside, for example via the flexible diaphragm; said diaphragm being furthermore secured to an actuator arranged outside the micropump, characterized in that said diaphragm is secured to the actuator by way of at least one element in the form of a strip, which is rigid along its main axis and flexible in the direction perpendicular to its main axis.
摘要:
The invention relates to a pumping device including a pump (1) comprising—a pumping chamber (11) having a variable volume,—an inlet (2) communicating with the pumping chamber (11) and comprising a valve,—an outlet (5) communicating with the pumping chamber and comprising a valve,—an actuator adapted to change the volume of the pumping chamber,—a fluidic pathway comprising said inlet (2), said pumping chamber (11), said outlet (5) and a downstream line (7) situated downstream of the outlet valve,—a pressure sensor (4) for measuring the pressure between the valves of said pathway,—processing means for processing the received pressure data from the pressure sensor (4). The invention also covers a method for detecting a dysfunction in a pumping device as defined above.
摘要:
The invention concerns a flow regulator, made of a stack of 3 plates, respectively a top plate including a flexible membrane (1), a middle plate (2) with pillars and through holes and a bottom plate (3) with fluidic ports, micro channels and through holes (8,9,12). The principle is based on the deformation of the membrane due to the pressure of the liquid. The membrane goes in contact with the pillars of the middle plate, obstructing gradually the through holes of the pillars. The device is designed to keep the flow constant in a predefined range of pressure. The device is dedicated to ultra low flow rate up to 1 ml per day or below, typically for drug infusion. Plastic flow regulators comprise preferably several independent valves coupled in parallel. The membrane plate is therefore made of several flexible membranes obstructing gradually the flow by increasing the pressure. Stress limiters are used to avoid plastic deformation of the membrane. For implanted pump, the use of a flow regulator instead of a flow restrictor has several advantages, including the possibility to reduce significantly the reservoir pressure and to generate directly the pressure during the pump filling by using an elastic drug reservoir.
摘要:
The present invention describes the improvements due to alternated actuation cycles to reduce the delivery errors related to the pumping chamber elasticity, the actuator relaxation or hysteresis. The method actuates a pumping device with an optimal driving voltage profile, wherein the pumping device comprises a pumping chamber including a pumping membrane and a voltage controlled actuator connected to said membrane; the movement of said membrane being defined by three positions, namely a rest, a bottom and a top position. The method includes the actuation of the membrane with a pumping pattern including at least two different cycles: Cycle A: rest-bottom-rest-top-rest Cycle B: rest-top-rest-bottom-rest. The invention also relates to a device to carry out the method.
摘要:
A method for actuating a pumping device with an optimal driving voltage, wherein the pumping device comprises a pumping chamber (4) having a pumping membrane (1), an inlet (3) and an outlet chamber (5), a voltage controlled actuator (6) connected to said pumping membrane (1), said pumping membrane reaching a stop position defined by a mechanical stop (2) a sensor for determining whether the pumping membrane has reached said mechanical stop (2); said method comprising a learning and working phase, wherein the learning phase comprises the following steps actuation of the pumping membrane (1) by applying a predetermined actuation voltage Vact to the actuator (6) said pumping membrane (1) reaching said position in an over-actuation step or not reaching said mechanical stop (2) position in an under-actuation process; after the over-actuation step, decreasing the voltage so that the pumping membrane (1) has left said mechanical stop (2) position and storing as the optimal voltage Vact optimal or in the under-actuation step, increasing the voltage so that the pumping membrane (1) reaches said mechanical stop (2) position and storing as the optimal voltage Vact optimal actuating the pumping device in the working phase with the determined optimal voltage value Vact optimal.
摘要:
A fluid flow regulator (1) of the passive type is disclosed which has a fluid inlet adapted to be connected to a fluid reservoir and a fluid outlet (13) adapted to be connected to a patient's body. The regulator comprises a rigid substrate (2) and a resilient membrane (3) tightly linked together so as to define a cavity (6) there between which is disconnected to the fluid outlet while the membrane has a first surface (12) opposite the cavity which is connected to the fluid inlet. The membrane has a plurality of through holes (15) contiguous with the cavity, to define a pathway for a fluid from the fluid inlet to the fluid outlet, and is flexible so as to be able to come into contact with the substrate as a fluid applies a sufficient pressure on the first surface. The through holes are arranged such that, when the fluid pressure increases, they close one after the other to increase the regulator fluidic resistance so that a fluid flow rate would be substantially constant as a function of the pressure applied on the first surface within a predefined pressure range.