DK172848B1 - Syringe for catheter connection - Google Patents

Description

in DK 172848 B1 o

The invention relates to a syringe of the kind specified in the preamble of claim 1 for checking the position of a venous catheter during insertion and use.

Checking the position of a vein catheter is already necessary during catheter insertion. After the vein is punctured and the catheter is inserted, the catheter is pushed forward toward the heart under continuous ECG control until the potential of the cardiac chamber is visible on the monitor. Continued insertion would be dangerous as the catheter tip could penetrate the ventricles and trigger rhythm disturbances. The catheter is then pulled approx. 2 to 3 cm left. Hereby, the special anterior chamber potential disappears again, and the user now knows that the catheter tip is in front of the anterior chamber * This is the correct position 15 for a central venous catheter. It has been found that there is a need to improve the state-of-the-art apparatus for measuring the ECG potential of the cardiac chamber in terms of manufacture and convenient use.

To achieve a really good usability, the following requirements must be set for an apparatus for transmitting intracranial ECG potential over a central venous catheter for position control:

Preparation as a disposable sterile article, the insertion of the catheter, including the measurement, must be possible under completely sterile conditions, for later control (testing the position of the catheter, for example, every other day), the measurement process must be possible on the conventional infusion line systems heretofore. Due to the risk of forming air plugs, it is not necessary to unscrew the infusion line parts.

Between the infusion line and the catheter no additional residual part may be incorporated, as each connection point during use carries a risk of unintentional loosening, and each connection site in particular represents a possible penetration opening for germs.

For the sake of safety during use, the position check during insertion of the catheter must be able to be performed with the same grip as the catheter insertion process itself.

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DK 172848 B1 cess.

When using the ECG position control device, no disturbing side effects, e.g. from extra, around hanging cables, which may be inconvenient during the care of the patient and may possibly cause accidental tearing of the catheter.

Additional parts introduced into the infusion system (e.g., metallic contacts for transferring the potential) may interfere with a smooth, unobstructed flow. Any disruption of the smooth surface involves the risk of blood clotting (since the catheter can also be given blood transfusions, just as blood can be taken through the catheter for diagnostic purposes). The koa-15 yellow blood could partly be flushed to the heart through the catheter and partly be stuck in very small scratches, thus forming an excellent breeding ground for bacteria.

In the case of blood sampling, laboratory values should not only be distorted (eg iron, copper).

For the sake of cost, the device must be manufactured in the simplest possible way.

These complex requirements do not yet sufficiently satisfy the prior art apparatus.

25 One from the description to German usage pattern no.

82 29 899 known connection of an insulated adapter with electrical connection lead between the infusion line and the catheter may have a simple design, but causes problems with separation of the infusion line and the associated possibilities of complications. Such separation, in particular, requires different handles and can also cause problems in terms of sterility and the risk of infusion.

An adapter that can be connected to a syringe 35 is discussed in Anasthesia und Analgesia, Volume 61, No. 10, October 1982, page 884 ("New Intravascular Adapter"

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3 DK 172848 B1

Electrocardiogram "). This adapter contains a tubing system with internal wires forming the contact portion and, according to the authors, seems to make the use of heparinized solutions advisable in order to provide unobstructed blood flow back at the position check after insertion of the catheter. the electrically conductive system between catheter and ECG cable also causes an antenna effect, where interference signals are recorded which then overlay the derived ECG curve on the monitor.

The object of the invention is to improve a syringe for connection with a venous catheter for position control thereof during insertion and use in such a way that it optimally meets the complex requirements set out above.

This is achieved according to the invention in that the syringe, a contact part located in its fluid body and the conduit serving to connect the ECG apparatus form an independent, sterile unit.

Claims 2 and 3 disclose advantageous embodiments, wherein the syringe has a one-way three-way path between an infusion line and the venous catheter connectable cone, respectively. is designed for direct connection with the vein catheter connection.

Claims 4, 5 and 6 deal with advantageous possibilities for placing the electrical connection line and its contact part on the syringe.

In all cases, it is ensured by the invention that the parts 30 required in the course of the position check in sterile condition are available to the user and that the sterile area cannot be broken due to externally supplied non-sterile parts.

However, the design of the syringe according to the invention also ensures that blood can easily and unobstructed pass through the venous catheter. The user can thus safely prevent the catheter with the tip from touching the vein wall or the hinge. DK 172848 B1

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4 clings to a small side branch. Internal damage to the vein wall with subsequent thrombosis is thereby excluded.

While so far, special electrolyte solutions, especially boiling salt solution for ECG position control, have been recommended, comparative conductivity measurements for the most diverse infusion solutions have shown that besides virtually all electrolyte-containing infusion solutions, blood is equally suitable. Thus, the blood collected for control of blood flow can be utilized at the same time to measure the intracardiac potential. The syringe of the invention enables this effect to be utilized without the risk of thrombosis and other disadvantages.

While the syringe is aspirated with blood for testing the reflux, the ECG potential is simultaneously diverted from the tip of the catheter and becomes visible on the monitor, ie. that the position check can be performed with exactly the same grip as those used so far in the insertion of the catheter.

20 The later control of the position is carried out just as easily. In addition to the free path through the three-way cock through which blood collection for laboratory control usually occurs, blood with the syringe of the invention can also be drawn up so that the ECG potential through the blood column can be transferred from the tip of the catheter. Since also the third path towards the infusion line is usually closed during this process, an optimal protection against interfering effects from an antenna effect is thus obtained.

30 The apparatus can be manufactured as a cheap disposable article, because precisely because of this disposable use, no special requirements are required for the execution of the contact part.

Since the lead for connection to the ECG apparatus 35 is attached directly to the syringe, the insertion of the catheter and the simultaneous position check are required.

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5 DK 172848 B1 is under completely sterile conditions, with no outside sterilized parts to be inserted into the sterile working area.

Because of its small size and simple construction, the entire apparatus can be sterilically packed into a catheter set, so that the entire process of inserting the catheter includes the control of its position by one person. A helper to sterilize various extra parts can be avoided.

10 It should be mentioned that it is common practice to place a three-way cock in the connecting line between the venous catheter and the infusion vessel. With the present invention, this known arrangement can be utilized in a particularly favorable manner for position control of a venous catheter by means of an electric contact part syringe.

In the following, some embodiments of the invention are described with reference to the drawing, in which: FIG. 1 shows an apparatus for catheterizing veins with a syringe with a conduit connected to an ECG apparatus and with a three-way tap connecting a venous catheter, an infusion tube and the syringe to each other; and FIG. 2 shows another embodiment of the syringe.

In FIG. 1, a venous catheter 1 of the usual type 25 is seen with a tapered connection groove.

The venous catheter may e.g. be a thin plastic tube which, after puncturing the vein, is inserted in a known manner and pushed forward to the heart. To check the position of the vein catheter's position at insertion into the heart, the venous catheter is filled in known manner with electrolyte fluid, and also in known manner, the electrical heart pulses passed through the electrolyte fluid are passed over connecting leads to an ECG apparatus.

The conical connection sleeve 3 of the venous catheter 35 is of the standardized design, so that as required in FIG. 1 diagrammatically shown in three steps 6

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DK 172848 B1 cock 7 with a standard conical connection pin 9 or directly an injection syringe corresponding to the syringe 11 shown in the drawing. One of the three ways of the three-way cock 7 is one in conjunction with a conical connection sleeve 13 which is connected to a conical connection pin 15 on a An infusion tube 17, which extends from an infusion container 17. A tapered connecting sleeve 19 for the third path of the three-way tap 7 is connected to a connection pin 21 for the syringe 11, which is provided with an electrical contact part.

For this purpose, an electrical connection line 5a may, in the manner shown, open into the fluid compartment of the syringe with a contact part 23 on the inside of the syringe cylinder, or an electrical connection line 5b may be inserted with a contact part 25 to the inner end of the syringe plunger 27. .

In yet another possible embodiment, also shown in FIG. 1, an electrical connection line 5c for connection to the ECG apparatus may have a contact portion 29 riveted to a metal plate 30 at the front end of the interior of the syringe 20.

FIG. 2 shows another embodiment in which the electrical connection line 5d leading to the ECG apparatus, with its contact part, ends in an extension part 33 which can be inserted into the conical tip of the syringe. The extender portion 33 and the tip of the syringe may be welded together or may be joined together by a snap joint or similar. In any case, the syringe, contact part and connection line of the ECG apparatus form a sterile unit which, owing to the independence of other parts, enables a very easily manageable position control and can be readily available in sterile form. The flexibility of the connection line also contributes to this.

By means of the three-way tap 7, the fluid connection between the venous catheter 1 and the infusion tube 17 coming from the infusion container can be disconnected and the syringe 11 with

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7 DK 172848 B1 the electrical contact part 23 and the connection line 5a of the ECG apparatus instead of being connected. The syringe may be of the same type as that normally used for insertion of a vein catheter to determine if blood has been aspirated if the vein has been punctured so that the vein catheter can penetrate the vein.

The fluid connection between the venous catheter 1 and the syringe 11 can then be blocked from the infusion vessel for control of the catheter position by the three-way valve.

This is also important when the infusion fluid is not electrolytic, since electrolyte fluid can then be injected into the vein catheter with syringe 11.

In cases where a larger amount of infusion fluid or any electrolytic conductive infusion fluid is not to be used, the electrically conductive syringe 11 over its tapered portion 21 or its extender 33 may also be directly connected to the tapered connecting sleeve 3 of the vein catheter 1 to connecting the electrolytic fluid in the vein catheter to the ECG apparatus over the electrical connection line 5a or a corresponding line for checking the position of the vein catheter.

25 30 35

Claims (6)

An electrically insulating syringe for connecting a vein catheter for aspirating and spraying fluids and connecting to an ECG apparatus line 5 for measuring the electrical potential of the fluid column in the vein catheter for checking the position of the vein catheter during its insertion and use, characterized in that the syringe (11), a contact part (23,25,29) located in the liquid compartment of the syringe and a conduit serving to the ECG apparatus (5a, 5b, 5c, 5d) form an independent, sterile device. Syringe according to claim 1, characterized in that it has a tapered connecting pin (21) which can be connected to a three-way tap (7) between an infusion line (17) and the vein catheter (1). Syringe according to claim 1, characterized in that the syringe is arranged to be connected directly to a conical connection sleeve (3) on the vein catheter (1). Syringe according to claim 2 or 3, characterized in that the electrical connection line (5a and 5c), respectively, with its contact part (23 and 29, respectively) ends on the inside of the liquid compartment of the syringe. Syringe according to claim 2 or 3, characterized in that the electrical connection line (5b) with its contact part (25) ends on the inner end of the syringe plunger. Spray according to claim 2 or 3, characterized in that the electrical connection line (5d) with its contact part (31) ends in an extension (33) which can be inserted into the conical connection pin (21) of the syringe. 35