DE8610008U1 - Vascular access with short-circuit connection for arterio-venous hemofiltration - Google Patents

Description

Mr. Manfred Härdtlein, 8561 Pommelsbrunn

Vascular access with short-circuit connection for the arteriovenous Hemofiltration

State of the art

The invention is based on a vascular access with a short-circuit connection for arterio-venous hemofiltration according to the species of the main claim. At the arteriovenous Hemofiltration takes a patient's artery and vein through a hose system to a hemofilter connected to know to make a blood filtering. There are several ways to make this possible known methods can be used. One possibility is the well-known "Scribner shunt", with one collaf

Teral artery and vein of an arm or leg by surgical measures using special vessel tips connected to a flexible silicone tube and sewn. The two silicone hoses are each carried outwards through tissue and skin

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leads and are then available to extracorporeal To connect circuits, e.g. for arterio-venous hemofiltration *

To do this, push the silicone tubing onto the slightly conical ends of the connectors of the blood tubing system, that leads to the filter. Although such a connection is liquid-tight due to the tolerances, it is only relatively low axial loads exposed. The nursing staff working with it tries this weak point to compensate with bandages. Unfortunately, this does not provide optimal security against disconnection guaranteed. If the intensive care patient moves and unconsciously pulls the connection apart, his blood flows unhindered, and he will bleed to death if not detected and remedied very quickly. In addition, that the trimming of the connection and also the production of the same is not possible without a certain expenditure of force, wherein it is usually unavoidable that these tensile or shooting forces are transferred to the implanted part and lead to its loosening or to pain in the patient.

If no extracorporeal treatment is to be carried out, the known Scribner shunt is closed short both silicone hoses by placing them on both sides of a short cylindrical plastic tube pushes. In this state, too, the problem remains the same as just described, since it affects the tube Pushed hoses are difficult to secure and are not to be regarded as pressure-resistant.

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Advantages of the invention

The vascular access according to the invention with short-circuit connection with the characterizing features of the main claim has the advantage that an unintentional and independent loosening of the connection to the extracorporeal Circuit or the short-circuit connection is no longer possible. This security is provided by the screw connection guaranteed / whereby due to the relative rotatability of the screwing means to the connected system or for a short-circuit connection, it is prevented that the latter opens again by itself after installation, if the connected hose to the filter or the short-circuit connector would twist, so there would be the risk that the screw nipple would be unintentionally due to the entered torsional stress and could be untwisted again by itself, or the twisting leads to a narrowing of the tube lumen and thus to a reduction in blood flow (possibly up to stasis!) can come.

Another advantage is that this connection according to the invention can be produced quickly and cleanly and is trimmable again. Particularly when trimming, uncontrollable movements are avoided unwanted blood loss occurs. When making the connection, a "venting" can be achieved in which almost no blood is lost.

It is known to use screw-plug connections of this type for connecting cannulas in surgery use without anyone having the idea to use this

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binding also for implanted vascular access and arteriovenous Use shunts.

-According to an advantageous embodiment of the invention consist at least the connecting pieces and the short-circuit connection made of silicone material, so that a certain Elasticity is given. Otherwise a material j its use in the known short-circuit connections is common.

In a further embodiment of the invention, both connection pieces for the vein and artery are used as nut pieces formed and the corresponding ends of the short-circuit cannula as father's pieces. Corresponding father pieces are also on the ski systems for the arterial

! to find venous hemo filters. The vascular access

> both in the used and in the short-circuited

State secure and clearly connected.

Further advantages and advantageous refinements of the invention are given in the following description of the Drawing and claims can be taken.

drawing

An Äüsführungsbeispiel the subject matter of the invention is shown in the drawing and is described in more detail below. Show it:

Fig. 1 arterio-venous vascular access with installed short-circuit connection and

2 shows the screw-plug connection in an exploded view .

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Description of the embodiment

In Fig. 1, the lower leg 1 of a patient is shown with implanted vessel tips 2, of which one is inserted into a vein, the other into an artery and each has a connection point 3 are firmly connected with vascular access 4. These vascular accesses 4, like the vascular tips 2, remain firmly attached to the patient connected as long as this is under appropriate treatment. There may be flanges at the vascular access 4 5 arranged in order to be able to anchor vascular accesses and vascular tips better to the patient. With the implanted Vessel tip 2 is firmly connected to the vascular access 4 at 3 in the manner customary for such implants. That is, the silicone end of the vascular access 4 is pushed over the end of 2 protruding from the blood vessel and tied tightly with appropriate threads by the implanting surgeon.

The two vascular accesses 4 are screw-plug connections 6 with one serving as a short-circuit connection Short-circuit line 7 detachably connected, always when the patient is not using a filtration device connected is. For treatment with the filtration device, the short-circuit line is via the Screw-plug connections 6 removed from the vessel access 4 and the latter connected to the filtration device via hoses.

In Fig. 2, this screw-St <i: k connection 6 is enlarged Scale and shown in Explot.j.onsform.

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The vascular access 4 is at that facing away from the vascular tip 2 End section designed as a nut piece 8 into which either a plug 9 or the end 10 of the short circuit connection 7 can be plugged in as a male piece. The free end of this nut piece 8 has a flange 11, on which an external thread 12 is arranged, into which an internal thread 13 of a screw cap 14 engages. At the other, The end of the nut piece 8 facing away from the plan 11 is provided with an annular bead 16 over which to produce a form-fitting connection of the vascular access, the silicone tube part of which is pushed over the bead 16 is.

In the plug version, the plug 9 is firmly connected to the screw cap 14, so that after insertion of the plug 9 in the nut piece 8 of the vascular access, the thread 13 can be screwed into the thread 12, wherein the plug 9 is rotated in the bore.

It is different when connecting the short-circuit connection 7. Here is at the end section of the short-circuit connection 7, a splash 15 is provided on which the union nut formed screw cap 14 engages so that when the short-circuit connection 7 whose cannula does not turn.

All of the features presented in the description, the following claims and the drawing can both be essential to the invention individually as well as in any combination with one another.

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Claims (6)

■ · * · • · t 4 ff • t · nil G 1287 / Sü / wi 10.4.86 Mr. Manfred Härdtlein, 8561 Pommelsbrunn Vascular access with short-circuit connection for arteriovenous hemofiltration claims 1. Vascular access with short-circuit connection for the arteriovenous Hemofiltration with two connected via vessel tips Vessel accessor, and with one the two Detachable short-circuit connection connecting vessel accesses, characterized in that between the vessel accesses (4) and the short-circuit connection (7) each have a screw-plug connection (6) (luer lock) whose screw nipple (14) can be rotated relative to the short-circuit cannula (7). 2. Vessel access with short-circuit connection according to claim 1, characterized in that at least the vascular accesses (4) and the short-circuit connection (7) are made of silicone material. 3. Vessel access with short-circuit connection according to claim 1 ! ■ · ■■ ·· re · * · ι · G 1287 / SU / wi 1 + .4.86 - 2 - oder.2, characterized in that both vascular accesses (4) are designed as nut pieces for the vein and artery and accordingly the ends of the short-circuit connection (7) as father pieces. 4. Vascular access with short-circuit connection according to claim 3, characterized in that the ends of the Kur ^ circuit connection (7) are tightened on each of the vascular accesses (4) by a union nut (14). 5. Vascular access with short-circuit connection according to one of the preceding claims, characterized in that that between the nut piece (8) and the vascular access (4) there is an overplaced hose connection with an annular bead (16) on the end of the nut piece. 6. vascular access with short-circuit connection according to any one of claims 3-5, characterized in that the connection between short-circuit extension (7) and its two terminal father pieces (10) as Pulled-over hose connection is formed with a Rinabulst on each male end.