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:
Method for detecting failure including possible under or over delivery of a micropump having at least an inlet valve, a pumping chamber with an inner pressure sensor and an outlet valve, said method comprising the determination of the pump tightness via the measurement of the pressure by said inner pressure sensor in said pumping chamber at least at certain intervals when the pump is inactive and the comparison with a value of reference.
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:
Method for detecting failure including possible under or over delivery of a micropump having at least an inlet valve, a pumping chamber with an inner pressure sensor and an outlet valve, said method comprising the determination of the pump tightness via the measurement of the pressure by said inner pressure sensor in said pumping chamber at least at certain intervals when the pump is inactive and the comparison with a value of reference.
摘要:
The regulator comprises at least a cylinder (2) with a fluid inlet connector (1) for receiving fluid at an inlet pressure and a fluid outlet connector (4) for delivering fluid, at least one chamber (3), a rod (5) in said cylinder with one side submitted to the inlet pressure and the other side submitted to the outlet pressure generating a net force counter-balanced by at least one spring means (7) acting on one side of said rod (5) against said inlet pressure, wherein a fluidic pathway is formed between said rod (5) and said cylinder (2) as the major fluidic resistance of the device, wherein a change of the inlet pressure induces a move of the rod along the axis of the cylinder thereby modifying the fluidic resistance of said fluidic pathway, wherein the fluidic resistance of said pathway varies with the applied pressure at the inlet in a predefined range of pressure, inducing a regulated flow rate in the considered range of pressure.
摘要:
Flow regulator for the infusion of medicaments, comprising, in succession, a substrate (1), a channel (5), a spacer (3) and a membrane (4), the latter having at least one hole (6) communicating with the channel (5), characterized in that the regulator is produced from at least two separate elements (1-4), the first element comprising the membrane (4) and the second element comprising the spacer (3).
摘要:
The invention relates to a method of measuring a volume in a fluid flow micromechanical device (100) by optically measuring the profile of a surface therein, the method comprising the following steps: a) providing and positioning an optical apparatus (10; 50; 30; 70) for measuring the profile of a surface; b) providing means (24; 44; 64; 84) for acquiring and processing the images coming from the optical apparatus for measuring a profile; c) placing said moving member (133) in a first position and then in a second position, and activating said optical apparatus for measuring the profile of the surface to direct a light beam on said reference face, and activating the image acquisition and processor means to obtain a first image in said first position of the moving member (133) and a second image in said second position; and d) comparing said second image with said first image of said reference face to determine the variation in the volume of the cavity (138) generated by the deformation of the moving member.
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:
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.