WO1996005876A1 - Dispositif de motorisation pour produire de tres faibles deplacements - Google Patents
Dispositif de motorisation pour produire de tres faibles deplacements Download PDFInfo
- Publication number
- WO1996005876A1 WO1996005876A1 PCT/FR1995/001123 FR9501123W WO9605876A1 WO 1996005876 A1 WO1996005876 A1 WO 1996005876A1 FR 9501123 W FR9501123 W FR 9501123W WO 9605876 A1 WO9605876 A1 WO 9605876A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluid
- chamber
- plate
- liquid
- deformable
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/015—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
- A61L9/04—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
- A61L9/12—Apparatus, e.g. holders, therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
- A61M5/148—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons flexible, e.g. independent bags
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16804—Flow controllers
- A61M5/16822—Flow controllers by controlling air intake into infusion reservoir
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/141—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor with capillaries for restricting fluid flow
Definitions
- the invention relates to a motorization device making it possible to vary the volume of a closed enclosure very slowly and, in particular, making it possible to move one of the walls constituting it.
- the invention also relates to the use of the motorization device for the production of a device for delivering very small quantities of fluids from flexible or hard tanks, another application is the production of very slow movements, another application is drug delivery by infusion.
- the existing processes for example textile wicks or soaked porous bodies have flow rates which are difficult to control.
- the flow they deliver is a function of the altitude of the injection point relative to that of the reservoir. It is therefore not possible to inject liquid at an altitude higher than that of the free surface of the tank.
- This variation in volume can be used to generate a flow of fluid or to move a wall supporting an object.
- the applications envisaged relate to the control of fluid flow rates and the position control of objects.
- the device will preferably be of reduced cost.
- the very slow motorization device making it possible to move at least one plate is characterized in that it comprises: a deformable chamber which can contain a fluid, said plate constituting a part of the wall of said chamber, said chamber comprising furthermore a flexible wall. a medium, external to said deformable chamber, containing the same fluid. means making it possible to vary the pressure of said chamber relative to that of said external medium,
- the pressure in the deformable chamber is imposed by a prestressed elastic body, a spring or strips of materials similar to rubber for example.
- the pressure in the deformable chamber is imposed by a mechanical load, the pressure in the environment external to this chamber being produced by a pressure regulating apparatus.
- the external medium is the atmosphere and the transferred fluid is air.
- the capillary is then connected to the ambient medium on one side and to the deformable chamber on the other.
- the pressure drop consists of the very long channel formed by the passage left free between a flat plate engraved with a spiral-shaped channel and a flat counterplate.
- This counterplate may be a flat seal which will be held in place on its opposite face by equally spaced pins which make it possible to ensure uniform pressure on the face of said seal in contact with the spiral.
- the deformable motor is placed in a closed rigid box. It delivers through a hole drilled in this box a flow of fluid controlled by the change in volume of said motor.
- the fluid escaping from the box is air which is admitted through a pipe to a container containing a liquid provided with a dip tube.
- the pressurization of said tank by the gas causes the release of the liquid at the same rate as the change in volume of the engine.
- the displacement of the motor causes the deformation of at least one flexible pocket which delivers a controlled fluid flow.
- said flexible pouch contains an injectable medicament.
- the deformable pocket is flexible and is compressed by a spring.
- the fluid it contains escapes through the laminar pressure drop and is used in the external environment. If said fluid is air, it will for example be used to empty a liquid contained in a bottle or a vial.
- a fluid delivery device which uses a motor device of the type defined above and which, moreover, includes a laminar pressure drop on the outlet of the delivered fluid, it is advantageous to provide specific provisions aimed at overcoming the effect of temperature variations on the flow of fluid delivered.
- the invention consists in distributing the pressure drop between the gas and the liquid.
- the two pressure drops operate in series and the total pressure difference between the two extreme pressures of the circuit thus formed is equal to the sum of the two pressure differences on each of the fluids.
- the viscosity of a liquid decreases with temperature while the viscosity of gas increases with temperature.
- the viscosity of a liquid decreases relatively faster than that of the gas increases.
- the pressure drop on the liquid is lower than that of the gas flow.
- two capillaries for example a capillary 1 m in length and 217 micrometers in diameter on the air and a capillary of lm in length and 565 micrometers in diameter on the water outlet.
- the viscosity of water at 20 * C is 10 " 3 Pa.s.
- the method according to the invention does not imply that the pressure is decreasing when passing from the first tank to the second, then to the third.
- the total pressure drop is the algebraic sum of the two successive pressure drops. This means that in certain arrangements, the pressure can be the same in the upstream reservoir and at the outlet of the liquid.
- the above system of equations is then solved by considering the absolute values of the pressure drops between the first and the second tank, then between the second tank and the outlet ⁇ p is then the sum of the absolute values of these pressure drops. It will be appreciated that this aspect of the invention provides a great deal of flexibility in the use of liquid metering devices from pressurized air tanks.
- one application of this device relates to the dosing of drugs in ambulatory medicine, an operation which requires great consistency in the flow rates of the injected liquid.
- Another application relates to the injection of perfumes or antiseptic products into an automobile whose cabin constitutes an environment subjected to very large temperature variations.
- By relatively decreasing the pressure drop on the liquid there is a tendency to decrease the flow rate when the temperature increases.
- the relative proportion of pressure drop of the liquid will be increased.
- Figure 8 gives another embodiment of a low liquid flow diffuser;
- Figure 9 sounds a third embodiment of a diffuser;
- Figure 10 gives a fourth embodiment of a diffuser;
- FIG. 11 gives an example of application of the previous system to toilet bowls;
- FIG. 12a and 12b give a fifth embodiment of the diffuser;
- - Figure 13 gives an application of the system to the perfusion of medical patients;
- - Figure 14 gives a preferred mode of commissioning of the device in the case of a flexible joint type capillary;
- FIG. 16 shows a first embodiment of a diffuser with compensation for the temperature effect by the use of two laminar pressure drops
- Figure 17 shows a second embodiment of the diffuser of the type of Figure 16
- Figure 18 shows a third embodiment of the diffuser of the type of Figure 16
- - Figure 19 shows an embodiment of a diffuser comprising a capillary tube on the liquid outlet.
- FIG. 1a shows a motor 1 in the closed position of the fluid distributor block 2 and of the movable plate 3 connected together by the deformable membrane 4 and by the spring 5 which tends, in this figure, to separate the assemblies 2 and 3.
- the distributor block 2 consists of a flexible seal 6 pressing through a plate 7 provided with pins 20 on a plate 8 engraved with a groove 9, so that a channel is formed between the seal and the engraved plate of great length and small section. This channel constitutes a laminar pressure drop which limits the flow rate of the fluid passing through it.
- Figure 6 shows this arrangement in more detail.
- the section of the channel is less than 1 mm ⁇ and preferably less than 0.2 mm ⁇ .
- FIGS. 2a and 2b give another embodiment of the motor in which the spring has returned to the distributor block, which makes it possible to obtain a unit which is a little more compact than in the previous case.
- the springs are 4 in number and are located outside the deformable chamber. A very flat motor is thus obtained when it is at rest.
- elastic bands 14 have been put in place instead of the springs, their mode of action is comparable, the choice between the two systems involving implementation criteria, quality and price.
- the strips 14 are integral with the plate 3 and a rigid support 14.
- the cross section of the motor chamber has a relatively large equivalent diameter relative to the length of the spring at the end of its travel, that is to say when the chamber has reached its maximum volume.
- This arrangement makes it possible to control the movement of a plate having a relatively large surface area while limiting the stroke of the spring. Limiting the spring stroke is important because it is in this operating zone that the relationship between the force applied to the spring and its elongation is most linear. It will also be understood that the larger the surface area of the plate, the more efficient the "motor”.
- the ratio between the equivalent diameter of the plate and the total stroke of the spring is greater than 1 and more preferably still greater than 1.5.
- the fluid allowing the deformation of the chamber comes from an external pressurized reservoir 15 connected to the engine by a pipe 19 comprising a laminar pressure drop 16.
- the flexible membrane is, in this example, replaced by a bellows 17 in steel.
- the pressure in this bellows is controlled by the spring 18 which tends, in this example, to close the bellows.
- the device represented in this figure makes it possible to very precisely control the displacements of the movable plate 3, the assembly possibly constituting a linear actuator according to the direction of the arrow FI of great precision.
- the pressure in the tank 15 is 2 bar
- the pressure in the deformable tank is 1 bar
- the working fluid is water
- the section of the deformable chamber of 5 cm 2
- the speed would be 16 times greater under the same conditions.
- this particularly simple apparatus to implement constitutes an actuator of extreme precision whose stroke can be several centimeters with a resolution of the order of a nanometer. It is therefore a particularly interesting application of the device. By associating, moreover, several devices of this type, one can easily carry out complex movements in space, going so far as to position a body according to the six components of the displacement torsor.
- FIG. 6 represents an arrangement for mounting a flat flexible seal 16 allowing it to be pressed perfectly onto a flat or slightly deformed surface.
- This technique is used in the various pressure drop blocks presented in the figures illustrating this text.
- One of the faces of the seal 6 is applied against the spiral 9 etched in the upper flat plate 8.
- the other face is in contact with the pins 20 of the lower plate, these being slightly pressed into the joint so that they apply a force in the form of very localized pressures.
- the seal is free to deform and the pressure that it exerts on the upper plate 9 is well distributed, but fairly low, so that said seal does not tend to close the channels of the spiral.
- Figures 7a and 7b show an arrangement for slowly diffusing a fluid, for example a room fragrance.
- the device consists of three assemblies, a lower part, an intermediate part and an upper part forming a cover.
- the lower part comprises the motor with deformable walls described in FIGS. 2a and 2b on which is fixed in a sealed manner by welding a box d21 provided with an outlet orifice 22 on which is fixed a tube 23.
- a tank 24 in which is finds the liquid to be dispersed is put in place on the previous motorized assembly.
- the tube 25 sinks onto the tube 23 and the assembly of these tubes is sealed.
- the reservoir is provided with a dip tube 27 allowing to evacuate the liquid from the bottom of the tank in which a low point 28 has been formed.
- This tube 27 is extended in its lower part by a bulge 29 which makes it possible to compensate for possible temperature variations and the resulting expansions of the air contained in the deformable chamber and the upper part of the reservoir.
- the reservoir is surmounted by a cover carrying a dip tube 26 which is introduced into the tube 27 in order to prevent the liquid from spilling in the event of the assembly falling.
- Said liquid can then spread over the cellulose wadding 32 and diffuse into the atmosphere through the orifices 31 of the cover.
- the bulge 29 of the piping 27 allows storage of the air drawn back by the piping 27 which can result from the cooling of the air contained in the deformable chamber and the upper part of the tank. If we imagine a heating of the air during operation of the device, its expansion will produce a peak flow of liquid. When this air cools again, it retracts and tends to suck atmospheric air through the pipe 27. If the pipe 27 was a capillary, the air thus sucked would immediately go into the sky of the tank. Subsequent heating would therefore immediately expel liquid. On the contrary, with the proposed arrangement, the sucked air is stored in the pipe 27 and in its bulge. A untimely heating after the device has cooled will only replace this quantity of air with the liquid. The total flow of liquid will therefore not be disturbed in the event of cyclic temperature variations thanks to this air buffer reserve which prevents too rapid alternating emptying of the liquid tank.
- Figure 7b gives a separate sectional view of the various components of the device, the lower technical device containing the engine, the tank, the cover and the cellulose wadding.
- FIG. 8 is also a device for diffusing liquid from a bottle, the cap of which is provided with an air inlet and a dip tube provided at its base with a bulge making it possible to compensate for the thermal effects of the same way as above.
- the operation is identical to that of the previous device, except that the air extracted from the box 24 is introduced into the bottle 33 through the cap 34 via the capillary flexible pipe 35.
- the advantage of this arrangement is that it is possible to diffuse liquids contained in containers made of any material and, in particular, crystal or glass for cosmetic or medical applications.
- FIG. 9 gives another embodiment of the device according to the invention.
- the motor 1 pushes a flexible pocket containing the liquid to be dispersed.
- said flexible tank consists of a flexible membrane 37 welded to a plate 38
- This plate is itself linked to a plate 39 cooperating provided on the one hand with a plug 40 in the wall of which is formed a groove 41 of small diameter and on the other hand of a spiral also of small diameter which, in contact with the plate 38 creates a channel drainage for drainage.
- the role of these small channels is to prevent air from returning to the reservoir under the effect of a contraction of the deformable chamber resulting from a drop in temperature.
- the surface tension of the liquid makes it possible to create a pressure difference sufficient for the tank to retract under its own weight without sucking in air. This is another form of thermal compensation.
- these capillaries make it possible to prevent the liquid from being drained under the effect of accelerations of the container support. It is thus possible to place such a container in a vehicle in order to deodorize it or to perfume it without fear of seeing its contents overturn under the effect of gravity.
- the envelope comprising the plate 39 is provided with orifices 31 allowing the diffusion of the liquids deposited on the wadding 32.
- FIG. 10 gives yet another application of the invention which differs from the previous one in that the movable wall no longer pushes one, but two pockets, both welded to the plate 38.
- the first pocket 36 discharges the fluid which it contains through a capillary tube 43, while the interior pocket 42 discharges its liquid in the same manner as in the previous case by moistening a cotton wool 32, which re-diffuses by evaporating through orifices 31.
- FIG 11 gives an application of this double pocket device to the treatment of toilets.
- the bag 37 evacuates the fluid which it contains under in the form of drops 46 in the toilet bowl 44 in order to descale and disinfect it.
- the pocket 42 for its part, evacuates the fluid which it contains, a room fragrance, on a cotton wool which diffuses the odors in the rooms.
- the device is hung outside the toilet bowl by means of a bent piece 45 which includes the capillary 43.
- FIGS. 12a and 12b show an application of the invention in which the reservoir of fluid to be diffused is comprised between the rigid wall 21 welded to the distributor block 1 and the membrane 4.
- FIG. 12a shows this device filled with liquid
- FIG. 12b the same device emptied of its fluid.
- the membrane follows the shape of the container.
- the temperature compensation is carried out by placing in the tank when it contains a liquid, a small very flexible membrane bag 47 which shrinks when the temperature of the air in the deformable chamber of the engine increases and on the contrary sucks atmospheric air when said air in the deformable chamber shrinks.
- liquid outlet circuit passes through a small section tube formed in the part 60 which makes it possible to create a difference in static pressure under the effect of the surface tension, similar to the bleeding. 41 and to the spiral of FIG. 9.
- the length of the tube is equal to at least ten times its hydraulic diameter.
- Figure 13 is an application of the invention for injecting a drug initially contained in a flexible bag 48 as regularly as possible.
- the motor 1 driven by a spring which allows the movable plate 3 to be moved slowly.
- the pocket 48 is provided with a catheter 49, itself linked to a needle 50. This arrangement makes it possible to produce ambulatory perfusion devices with a quasi-constant flow rate.
- FIG. 14 shows a mode of arming the engine by evacuating the deformable chamber 13.
- a vacuum pump 51 is connected to the air inlet 11 of the engine by means of a pipe 52.
- the air contained in the deformable chamber 13 first tends to pass into the capillary 9. Then, as the vacuum is high, we tend to take off the seal 6 which sinks into the pins 20. Therefore, said seal is takes off from plate 8, leaving an important passage which lets air pass quickly.
- the deformable chamber then forces the spring to be crushed in the direction of the arrows FI, while the membrane contracts in the direction of the arrows F2. The process stops when the spring is completely flattened. It then suffices to place a plug in the orifice 11 to maintain the device in this armed state. By removing said plug, the engine is automatically started.
- FIG. 15 finally, also gives an embodiment of the motor in which the spring 5 expels the fluid contained in the flexible pocket 36 which is sealed, except for an orifice 12 in the plate 7 carrying the pins .
- Said fluid contained in said flexible pocket 36 passes into the clearance existing between the pins 20 and the seal 6, then into the spiral 9, and is expelled through the orifice 11 towards the outside, for example in a capillary intended for transfer air to expel a liquid contained in a tank.
- the movable plate 3 is provided with a click device enabling the spring to be held in the banded position. before the device is started.
- the bag can be filled with fluid in a similar manner to the previous case illustrated in FIG. 14 by injecting said fluid under pressure through the orifice 11.
- FIG. 16 an embodiment of the invention has been represented. with temperature compensation in which a flexible gas pocket 114 is compressed by a spring 115, which has the effect of increasing the pressure of the gas it contains. It is connected to a second flexible bag 116 contained in a rigid tank 117 by means of a distributor block 118 of the type described in FIG. 6 which includes a laminar pressure drop. A pocket 119 of liquid 140 is also enclosed in the tank 117. Under the effect of the increase in volume of the pocket 116, the liquid flows outside through the laminar loss distributor block 120. The together therefore constitutes a liquid generator with controlled flow rate in a predefined temperature range as soon as the pressure drops 118 and 120 are dimensioned according to the procedure described above.
- FIG. 17 gives another embodiment of the invention with thermal compensation in which a pocket of flexible gas 121 is placed under vacuum by the plate 150 under the action of the springs 122 and 122 '.
- the air 2 coming from the atmosphere 123 passes into the distributor block 124 with a laminar pressure drop and enters the flexible bag 121 consisting of the walls of the rigid container 125 and a membrane 126.
- This bag 121 is in contact with a flexible bag 127 filled with liquid 140 which is connected to the outside through a laminar pressure drop block 128 through which the liquid passes.
- the operation of the assembly is then as follows. Air 2 from the atmosphere 123 feeds the flexible pocket 121 through the distributor block 124.
- the flexible pocket 121 pushes the flexible pocket 127 filled with liquid 140, said liquid flowing outside through the distributor block 128, from a catheter 129 and a needle 130 in the form of drops 7.
- There is also an all-or-nothing valve 131 on the air supply which can be controlled manually to ensure the on-off function of the metering device or automatically according to a predefined rate to allow regulation of the liquid flow rate.
- the average flow of liquid will indeed be proportional to the flow of the device when the valve is open multiplied by the ratio of the sum of the opening times to the total time.
- This all-or-nothing mode of regulation is particularly simple and effective.
- the distributor blocks 124 and 128 are calculated to compensate for the effects of temperature variations on the delivered flow.
- two all-or-nothing valves are used, one on the liquid the other on the gas. When they are simultaneously closed, the liquid flow is immediately stopped, which may be of interest in certain applications. In other applications, only the valve located on the liquid outlet will be closed. At least one of these valves can be opened automatically, for example from an electronic and electromechanical device.
- FIG. 18 gives another preferred embodiment of the invention for which no spring is used, but where the power source is compressed gas 2 in the bottle 337.
- the gas After percussion of said bottle allowing the start-up, the gas passes through the tube 338 and enters the chamber 339. It then passes into the constant pressure chamber through the clearance provided between the valve 334 and the seat 335 of the flow regulator 341 consisting of the bellows 333, the spring 332 and of the vent 336.
- the arrangement of this pressure regulator allows gas from the bottle 337 to be admitted into the chamber 301 as soon as the pressure becomes less than a certain value depending on the spring and its tension, and of the dimensions of the bellows 333 and the shutter 334.
- the gas coming from the chamber 301 passes into the laminar loss 324, then into the chamber 321 limited by the flexible wall 326 and the solid wall 325.
- This chamber being indefor fluid, the liquid 340 contained in the pocket 327, itself contained in the pocket 321 is discharged from said pocket 327 through the laminar pressure drop block 328, then from the catheter 329 and the needle 330.
- a drop 307 which escapes from said needle.
- the two laminar pressure drops 324 and 328 are calculated to compensate for the effects of temperature variations.
- the supply of compressed gas to the reservoir 337 is done using a manual pump, for example a syringe provided with a suitable nozzle.
- a manual pump for example a syringe provided with a suitable nozzle.
- Special provisions can be added to the device, including the installation of a valve, not shown, manually controlled, which connects the chamber 301 and the chamber 321 and which allows a part of the liquid to be evacuated to start the system.
- FIG. 19 illustrates another embodiment of the diffuser using the motorization device in which the compensation of the thermal effects on the liquid flow rate is carried out using a long capillary tube mounted on the outlet of the liquid.
- the motorization device is constituted by the rigid wall 200, 202 and by the flexible envelope 204 containing the liquid to be diffused which defines an air chamber 206 having a flexible wall.
- a movable plate 208 In the chamber is mounted a movable plate 208 on which the spring 210 acts.
- the maximum stroke of the spring 210 and the equivalent diameter of the plate 208 satisfy the conditions set out above.
- the air entry into the chamber 206 is controlled by a block 212 forming a laminar pressure drop of the type shown in FIG. 6.
- the air enters at 214 in the channel of the control block and enters the chamber 216.
- the liquid contained in the flexible bag 204 exits through the tubing element 218 under the effect of the plate 208 and of the spring and of the air intake in the chamber 206.
- the tubing element 218 is connected to a long capillary tube which, in the example described is constituted by the spiral tube 220 itself connected to the helical tube 222.
- This arrangement makes it possible to reduce the bulk while obtaining a great length of tubing.
- the outlet of the tube 222 constitutes the outlet of the liquid to be diffused.
- a porous piece 226, for example of cotton wool, allows the diffusion of the liquid leaving the tube 222.
- the tubes 220 and 22 define a capillary tube of diameter of the order of 1 to 2 mm and of great length, for example 50 to 100 cm. This defines a volume for the relatively large liquid of the order of 1 cm 3 in which the liquid is subjected to the effects of capillarity. This volume of liquid makes it possible to ensure a regular flow thereof despite the effects of temperature variations on the air contained in chamber 206.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Anesthesiology (AREA)
- Hematology (AREA)
- Heart & Thoracic Surgery (AREA)
- Biomedical Technology (AREA)
- Engineering & Computer Science (AREA)
- Vascular Medicine (AREA)
- Epidemiology (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU32610/95A AU3261095A (en) | 1994-08-25 | 1995-08-25 | Motorisation device for producing very short displacements |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR94/10451 | 1994-08-25 | ||
FR9410451A FR2723851A1 (fr) | 1994-08-25 | 1994-08-25 | Dispositif pour delivrer de tres faibles debits de fluides |
FR9501637A FR2730325A1 (fr) | 1995-02-08 | 1995-02-08 | Dispositif pour delivrer de tres faibles debits de fluides de maniere controlee |
FR95/01637 | 1995-02-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996005876A1 true WO1996005876A1 (fr) | 1996-02-29 |
Family
ID=26231382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1995/001123 WO1996005876A1 (fr) | 1994-08-25 | 1995-08-25 | Dispositif de motorisation pour produire de tres faibles deplacements |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU3261095A (fr) |
WO (1) | WO1996005876A1 (fr) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3951147A (en) * | 1975-04-07 | 1976-04-20 | Metal Bellows Company | Implantable infusate pump |
DE2849518A1 (de) * | 1978-11-15 | 1980-05-29 | Horst Dr Med Kief | Medizinisches geraet zum durchfuehren von infusionen und transfusionen |
US4443218A (en) * | 1982-09-09 | 1984-04-17 | Infusaid Corporation | Programmable implantable infusate pump |
DE3634725A1 (de) * | 1986-10-11 | 1988-04-14 | Holzer Walter | Dosierpumpe z.b. fuer insulin |
US4744786A (en) * | 1986-06-17 | 1988-05-17 | Cordis Corporation | Infusion pump |
DE4222470A1 (de) * | 1991-07-08 | 1993-01-14 | Baxter Int | Geraet zur infusion von fluid in einen patienten |
WO1994017850A1 (fr) * | 1993-02-03 | 1994-08-18 | Flora Inc. | Procede et ensemble electrochimique de distribution regulee |
-
1995
- 1995-08-25 WO PCT/FR1995/001123 patent/WO1996005876A1/fr active Application Filing
- 1995-08-25 AU AU32610/95A patent/AU3261095A/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3951147A (en) * | 1975-04-07 | 1976-04-20 | Metal Bellows Company | Implantable infusate pump |
DE2849518A1 (de) * | 1978-11-15 | 1980-05-29 | Horst Dr Med Kief | Medizinisches geraet zum durchfuehren von infusionen und transfusionen |
US4443218A (en) * | 1982-09-09 | 1984-04-17 | Infusaid Corporation | Programmable implantable infusate pump |
US4744786A (en) * | 1986-06-17 | 1988-05-17 | Cordis Corporation | Infusion pump |
DE3634725A1 (de) * | 1986-10-11 | 1988-04-14 | Holzer Walter | Dosierpumpe z.b. fuer insulin |
DE4222470A1 (de) * | 1991-07-08 | 1993-01-14 | Baxter Int | Geraet zur infusion von fluid in einen patienten |
WO1994017850A1 (fr) * | 1993-02-03 | 1994-08-18 | Flora Inc. | Procede et ensemble electrochimique de distribution regulee |
Also Published As
Publication number | Publication date |
---|---|
AU3261095A (en) | 1996-03-14 |
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