DE2358228A1 - INFUSION DEVICE - Google Patents

Description

59, avenue d'Echirollea

38320 EYBEKS / France

Our sign; V 690

Infusion device

The invention relates to a device for regulating and controlling the drop throughput for a well-known infusion line.

An infusion set consists of a clear tube that is several centimeters away at one of its ends a bulge called a drop chamber, and at the opposite end has a connection for the needle. In the known devices, the transparent tube partially inserted into a device and compressed by fingers in a peristaltic motion. Depending on the speed of this movement, there will be more or less at the exit of the needle Drop ejected. This change is caused by a motor whose speed is different from that of the

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User desired and set number of drops is dependent. This speed of the motor that Preselected by setting the number of drops desired may not be accurate as it from the friction. of the peristaltic system, the pressure exerted on the transparent tube and depends on the voltage drops that result at the input of the motor supply, search if they have been stabilized beforehand. To avoid this inaccuracy, an electronic system monitors the Number of drops passing through the drop chamber and constantly compares them with the set number and they continuously record the speed of the motor via a further electronic memory circuit corrected. The disadvantage of such constant correction systems is that the accuracy regarding the setting cannot be maintained because the speed of the motor is constant fluctuates around the speed that would be necessary to maintain this setting. A Another disadvantage is that the transparent hose is arranged by about ten side by side Finger is squeezed tightly together, constantly releasing and squeezing him and finally putting him in squeeze and destroy in a short time. A further disadvantage is that with such devices the air bubbles that may accidentally enter the pipe cannot be detected. As is well known however, these represent a great danger if they get into the patient's circulation. In the end become such devices because of their complicated electronic equipment and their numerous Security systems for hospitals are too expensive.

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The device according to the invention allows these disadvantages to be eliminated. According to the invention is namely the transparent tube for expressing the liquid contained in it through rollers on ball bearings are mounted, compressed against a wall. The rolling force exerted in this way claims the Hose very little and, since the rollers are driven by a motor, the number is the end of the line the needle exiting drops on the number of pulses that. the engine receives, depending. This number of pulses set by the operator is provided by an electronic timer. An electronic eye placed on the drop chamber gives the motor every time it passes Drop a stop signal. Such a device is very accurate because the periodic movement of the Liquid ejection is exactly a single drop per control pulse. The device is a Means for detecting the air bubbles incorporated immediately if any Gas bubble interrupts any liquid ejection movement.

The device according to the invention has a wheel which has rollers on its periphery which are on ball bearings are mounted. This part rotates in a hole whose diameter is twice the distance between the axis of the wheel and the outermost point of the rollers. In this way, any load on the axle of the motor avoided, as this drives the wheel directly at its center. The hole is on one Section of its circumference is interrupted and the runway that it forms for the rollers is on this Replaced by a moving part that supports the

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original drilling continues, the radius increasing by a few tenths of a millimeter. This moving Element, on which springs press, slides in a guide that contains this element and is pivoted away can be. This mechanical part allows a part to be inserted by folding it away of the infusion tube between the rotating rollers and the movable element, which compresses the infusion tube with its springs. The movable one The runway must be so long that two roles can rest on it at the same time, so that when dss wheel provided with rollers rotates, there is always at least one roller on the runway to one Compression of the hose and any flow of liquid when the device is at a standstill to prevent. Such a mechanical pump has the following characteristics:

A part that can be folded away allows the hose to be inserted easily.

The hose is partially inserted in a rectilinear axis, while in known devices must form a complete loop to lie against the entire circumference of the bore. A moving part compresses the hose by means of springs and thus allows a permanent seal and the compensation of play or mechanical wear.

The motor is controlled by electrical impulses from an electronic timer. This is provided with a scale on which the user can set the number of drops that are in a certain

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Time the line should go through.

An electronic eye provided on the drop chamber gives the motor a stop command every time a drop falls from the infusion container into the drop chamber. The device works as follows: the electronic timer sends out a signal that: puts the engine into gear. The wheel fitted with rollers is set in rotation and pushes the liquid further in the infusion line. The electronic eye sends a stop signal to the motor as soon as a drop passes its light beam. The. The device is stopped, the hose is compressed by at least one roller so that any additional flow of liquid is blocked, and it is waited until a second pulse comes from the electronic timer. The liquid movement at the drop chamber achieved in this way _? which allows visual control by the user is absolutely precise, since the desired setting is constantly indicated in the number of drops per minute.

At the entrance of the hose into the mechanical pump there is a device for detecting air bubbles incorporated, which interrupts the power supply to the motor as soon as a bubble passes the tube. At safety devices are provided for each organ. If a single organ fails, the supply of the motor is interrupted and an optical and acoustic warning signal is triggered »This signal appears even with every "deliberate switch-on, if the error is still present. The end of the infusion, i.e. blocked when the infusion container is empty

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likewise the motor by allowing the electronic eye at a time greater than that by the electronic Timer in the case of the longest interval between two pulses is set time, no more drop notices.

Further details of the invention emerge from the The following description of an exemplary embodiment, reference being made to the accompanying drawings. It demonstrate:

1 shows an overall view of the infusion device,

Pig. 2 shows a vertical section through the infusion device,

Pig. 3 shows a horizontal section through the infusion device and

Pig. 4 shows a section through an exemplary embodiment of an electronic eye.

The one in Pig. The infusion device shown in FIG. 1 is on a The stand 1 is attached and has a vent 2 which is provided with an air inlet and opens into the drop chamber 9. These Droplet monitor is used to visually check the passage the drop 7 in the infusion tube 10, at the end of which a needle 5 is provided. The pump 6 clamps the Infusion tube 10 over a short length. An electronic eye 11 scans and scans the drops electronic timer 23 indicates the desired number of drops. The pump is connected to the mains with plug S.

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The device ″ has a wheel 12 with ball bearings 13 is provided and is fixed on the shaft of the motor 14, the ball bearings run, except on a section that the fold away door 16 corresponds to the hole 15. The Door 16 is folded away by rotating about the two axes 17 and contains the movable part 18 and compression springs 19, which have the task of pressing the movable part 18 against the ball bearings 13 when the door is closed. A lid 20 keeps the door closed by the hook 21. The infusion tube 22 is located between the ball bearings 13 and the moving part 18.

An electronic timer 23 supplies the pulses for starting the motor. Pig. 4 shows the electronic Eye that is attached to the drop chamber 9 by means of two peacock-shaped Recesses 24 is attached, which are provided opposite each other in two parts 25 and 26, wherein the part 25 is fixed and the other part 26 is movable. The guide is by a with a spring 28 provided rod 27 guaranteed. The lamp 29 inserted in the part 26 sends a light beam to the one opposite it Cell 30. As soon as a drop passes the light beam, a signal is issued to interrupt the Motor supply sent out. In the mechanical part there is one at the entrance of the infusion tube Device 31 is provided for detecting air bubbles. A block 32 contains all security devices that trigger acoustic and optical warning signals.

The device according to the invention can be used for all types of infusions, in particular for infusions, . which require a very low liquid throughput and a high level of accuracy of the injected volume.

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Claims (1)

Claims 1. ^ device for regulation and control of the Drop throughput for an infusion line, characterized by a mechanical Roller pump. 2. Apparatus according to claim 1, characterized that the infusion tube is partially insertable into the roller pump. 3. Apparatus according to claim 2, characterized in that the introduction of the Infusion tube into the roller pump is going on in a straight axis. 4. Apparatus according to claim 1, characterized characterized in that the mechanical roller pump consists of a wheel provided with rollers, that rotates in a bore that has the same diameter as its outer circumference, making each Force action on the shaft of the motor driving the wheel is avoided. 5. Apparatus according to claim 4-, characterized in that the bore on a section interrupted and eats in the area the interruption has a rectilinear movable part which is counteracted by an elastic device the rollers is pressed and the insertion of infusion tubes with different diameters between itself, and the rollers, with the axis of this rectilinear movement passing through the center of the wheel runs. AO9822 / 0879 6. Device according to. Claim. 5, thereby marked η. et that the rectilinear movable part is so long that with the rotation of the Rolls provided wheel is at least one role facing the gewegliehen part and rests on the infusion tube, so that any flow of liquid is blocked when the device stops. 7. Apparatus according to claim 5, characterized in that the rectilinear movable part compensates for the possibly existing Machining inaccuracies and mechanical Allows wear and tear. 8. Apparatus according to claim 5, characterized characterized in that the linearly movable Part is provided in a door that can be opened and thereby convenient insertion of the infusion tube permitted * 9 * Device according to claim 1γ ge k e η η draws through tax series, which successively cause the device to operate and stop * 1-0 «device according to claim 9, g e k e η η draws through one facility for Setting the desired work frequency a signal to start the rotation of the roller pump delivers * ΊΊ * Device according to claim % dadus? ö h geke η η ζ eieh η e ü that a scanning device provided on 4§r drop chamber gives the set pump a stop command for each drop delivered. 4098 22/0879 12. Device according to one of claims 1 to 11, characterized in that the mechanical roller pump has a device for detecting air bubbles opposite the infusion tube is incorporated. 13. Device according to one of claims 1 to 12, characterized in that if a single electrical or mechanical organ fails, an acoustic and visual warning signal which can only be eliminated after the original error has disappeared. 409822/0879 J4 Blank page