DE2541892A1 - ELECTROMECHANICAL INFUSION PUMP - Google Patents

Description

59, avenue d'Echirolles

38520 EYBENS / France

Our reference: Y 711

Electromechanical infusion pump (add to the patent (patent application P 23 58 228.7))

The invention relates to an electromechanical infusion pump, which in particular consists of a with EoI-len provided wheel that moves in a cylindrical bore of a housing, the is cut out on a section of its circumference and at this point by a movable one Part is replaced, which complements the bore with its shape and is elastic inside an insert is arranged.

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254189

The tube through which the infusion fluid flows is inserted linearly into the pump and is located between the rollers and the moving part.

Such a pump works satisfactorily in the case of ordinary infusions. It was, however found that they are in the case of very special infusions, such as blood infusions or when using sterile tubing, has certain disadvantages. In this case the Throughput control carried out by the user in a drop chamber. It is therefore necessary that the drops traversing the drop chamber exactly reflect the throughput behind the pump. In all systems where rollers are used to compress the hose, does not meet this condition. Any roll entering or exiting the compression path namely changes the throughput through a so-called dead center, which is the volume of the part of the Role corresponds to that compresses the hose or can be expanded again. Consequently the pumps equipped with such a system actually show a total flow rate, but this changes each time a roll enters or leaves the compression path, so that in the drop chamber a false Display takes place. For example, when a roll enters the compression path, it drips Drip chamber not a drip, while in reality behind the drip chamber (and thus in the Vein of the patient) there is a flow.

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The opposite takes place when a roll leaves the compression trajectory: a drop passes through the drop chamber, while there is no throughput behind the drop chamber.

The same problem of precision arises in the case of blood infusions, but with another problem There is a problem with the quality of the blood injected into the patient. It was found that that in the previously known devices that consist of rollers that the hose on a Compress compression tract, numerous platelets are crushed.

The aim of the invention is to eliminate these disadvantages and to provide an infusion pump with high precision to ensure that the quality of the product injected into the patient, especially in the case of Blood not affected.

The pump according to the invention has an insert on which the infusion tube compressing Support rollers, and is particularly characterized in that the profile of the insert in three Zones, an entry path, a compression path and an exit path, is divided.

Another feature of the invention is that the three zones have a circular profile.

According to another characteristic, the drawer has means which give it elasticity.

Further features and advantages of the invention will become apparent from the following description of a Embodiment, with reference to the enclosed

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Reference is made to the drawing. Show it: .

1 shows a section through part of an infusion pump with a known insert,

Pig. 2 shows a schematic representation of the insert according to the invention and

Pig. *> a section through part of an infusion pump with an insert according to the invention.

Fig. 1 shows in section a part of the infusion pump according to the main patent. This has in particular a housing 1 with a cylindrical bore 2. In this bore, rollers 3, which are arranged on a wheel (not shown) rotate, pressing a hose 4 against the movable part 6 of a window 5 and compressing it in the process. The profile of this part 6 corresponds to the curvature of the bore so that it is completed in this part of the device. With springs 7 or the like it is achieved that the part 6 can press more or less strongly against the hose if, for example, its diameter changes. The unit consisting of parts 5, 6 and 7 forms an element called the "drawer" ¹ .

In the case of FIG. 1, the usable profile of the insert is circular, with the usable profile being the Part of the insertion is understood in which the hose is compressed by the rollers.

Fig. 2 shows the useful profile of the invention

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Inset. It was found that the useful profile to avoid the aforementioned Disadvantages must have three zones; A zone AG or entry section, a zone AB or Compression zone and a zone BD or exit path.

Various embodiments are possible here. However, the three zones preferably have circular profiles, the center of the compression zone coinciding with the center 0 of the wheel carrying the rollers and the entry and exit sections having the centers O ¹ and O ¹ '.

It is also possible for the entry section and the exit section to be symmetrical with respect to the compression zone, the midpoints O ¹ and O ¹¹ possibly coinciding.

iig. 3 shows a representation according to FIG however, instead of the known insert, an insert 8 according to the invention is provided. Here the rollers 3 compress the hose 4 on the usable profile which is designed according to FIG.

Zone AB is the actual working zone, which corresponds to the movement of the liquid in the hose .

The lines AC and BD are designed so that the role that enters the compression zone AB or it leaves, on the respective route AG or BD depending on their rotational movement introduces or pushes away a constant volume.

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In other words, the failure of the other systems caused by suddenly entering the compression zone AB and the sudden exit from the compression zone is caused by eliminates progressive entry and exit. When the roller G is on the Konrorimierungszone AB arrives, the following roller H begins to compress the hose. The same happens when you leave the Compression zone AB instead.

The advantages of this device are, in particular, greater precision in infusions where sterile tubes provided with droplet chambers and, on the other hand, maintaining the quality of the product injected into the patient, especially if it is blood. In this case, the insert must have high elasticity in all directions in order to be crushed avoid some elements of the blood, such as platelets. To this end are eight grooves 9 (Fig. 3) are provided in the body of the insert.

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Claims (8)

Claims Electromechanical infusion pump with a Slide-in unit on which a wheel-borne clump is supported, which leads one linearly into the infusion pump Compress introduced infusion tube, characterized in that the profile of the insert is divided into three zones, namely an entry path, a compression path and an exit sstr ecke, with the number of roles and the dimensions of the insert and the zones chosen are that a roller is always in contact with the compression web. 2. Infusion pump according to claim 1, characterized in that the three zones have circular profiles. 3. Infusion pump according to claim 2, characterized characterized in that the entry section and the exit section have circular profiles that have a common center. 4-. Infusion pump according to one of the preceding claims, characterized in that that the entry section and the exit section are symmetrical with respect to the compression path Have profiles. 609815/0922 5. Infusion pump according to claim 4 ·, characterized characterized in that the midpoints of the entry path, the compression path and the exit section lie on a straight line. 6. Infusion pump according to claim 5j thereby characterized in that the midpoints of the entry path, the compression path and the Exit path lie on a straight line through the pivot point of the wheel provided with rollers runs. 7. Infusion pump according to one of the preceding claims, characterized in that that the insert is provided with devices that give it elasticity. 8. Infusion pump according to claim 7, d a d u ro h characterized in that the means consist of grooves formed in the body of the drawer are provided. 609815/0922