DE2918282A1 - Plastic catheter hose - with outer metal tape spiral for better torsional stiffness - Google Patents

Abstract

A catheter hose, for example for the kidney diagnostic, is made of a mixture of polyethylene and a filler material such as lead oxide which is opaque to X-rays. The catheter hose carries on the outside a metal spiral, preferably made of chrome tape, applied in a thickness of 5 to 10 u, preferably in two stages, first chemically and then by galvanoplasty. The metal spiral can finally be covered by a pigmented layer of polyethylene or polyurethane to a thickness of 0.1 mm. Such a catheter hose is torsion-resistant yet can follow all bends of the track of insertion.

Description

Plastic hose

The invention relates to a plastic tube, in particular a catheter tube for insertion into a patient.

A plastic catheter tube for kidney catheterization is known from D g 18 18 183.

This kidney catheter shows, in addition to its insertion On the side end near this end and laterally an opening through which the contrast medium flows. Such a catheter is relatively long and elastic so that when inserted into a patient it can easily reach the natural routes to the area to be examined. With this catheter it is difficult to bring the laterally arranged opening into the desired position when the catheter is inserted.

It is further through the prospectus Dlagnostic and Intervention Products for the Radiologist and Surgeon 1977 - 1980 by the William Cook company Europe Asp. Known to insert a wire mesh covering into a catheter wall, to thereby increase the torsional rigidity so that the catheter is easily adjusted can be. However, this is complex and the flexibility of the catheter is thereby negatively influenced.

The invention is based on the object of a plastic hose of the type mentioned at the beginning, which is torsion-resistant at the same time can be bent easily.

The object is achieved according to the invention in that the plastic hose is provided with a metal helix to increase torsional rigidity, which extends over its entire length. Because of the helical metal plating or insert, the catheter tube is torsion-resistant, whereby its flexibility preserved. The catheter tube is also given a because of the metal coil Semiconductor property and can discharge leakage currents. This eliminates the risk that current is supplied to the patient via the catheter tip in the event of an electrical fault will.

In an advantageous embodiment of the invention it is proposed that that the plastic catheter tube with two opposing coils is provided, with an insulating layer being present between the metal coils. This achieves a particularly high torsional stiffness and yet very good flexibility is achieved. Due to the insulating layer between the Metal coils can shift the coils a little with respect to one another. This will maintain good flexibility of the catheter.

Further details of the invention emerge from the subclaims.

The invention is illustrated below with the aid of two exemplary embodiments Connection with the drawing explained in more detail. They show: FIG. 1 a plastic catheter tube according to the invention, without an insulating layer, Fig. 2 shows a plastic catheter tube according to FIG. 1 with an insulating layer and FIG. 3 shows a further embodiment of a Plastic catheter tube after the Er-.

finding.

FIG. 1 shows a catheter tube 1 made from a mixture made of polyethylene and a radiopaque filler, e.g. lead oxide.

The catheter tube 1 has a metal helix on its outside 2 coated. The metal coil 2 can for example consist of a metal strip made of chrome.

The torsional stiffness can depend on the width and thickness of the tape can be increased compared to a hose without a metal helix. The metal spiral covering can be applied in two steps, first chemically and then galvanically will. The layer thickness can be about 5 to 10 μm. The metal coil 2 can then with an insulating layer 3 (Fig. 2) made of a suitably pigmented polyethylene or Polyurethane material to be covered with a thickness of about 0.1 mm.

Figure 3 shows that the catheter tube 1 with two opposite directions mutually lying coils 4, 5 is provided. This significantly increases the torsional stiffness.

A very thin insulating layer is located between the metal coil layers 4, 5 available. Because of this insulating layer, the coils 4, 5 can mutually move something. This gives the catheter particularly good flexibility.

The metal coils of the catheter tube increase the strength against Liquid pressures and allow a relatively thin wall thickness at a given load.

The invention does not apply to catheter tubes for medical purposes limited, but also refers to plastic tubing used in other areas be used, e.g. on tubes for ventilators or other tubes, where a high flexibility, combined with a high torsional stiffness, required, e.g. water hoses.

Claims (6)

Claims ç plastic tubing, in particular catheter tubing for introduction into a patient, that is not indicated he to increase the torsional stiffness with a helix (2) made of a metal is provided, which extends over its entire length. 2. Plastic hose according to claim 1, d a d u r c h g e k e n n z e i c-h n e t that the hose (1) has a plastic core on its Outside is covered with the metal coil (2) and that the metal coil (2) through an insulating layer (3) is covered. 3. Plastic hose according to claim 1 or 2, d a -d u r c h g e k It is noted that it has two coils lying opposite one another (4, 5) is provided, between which there is an insulating layer. 4. Plastic hose according to one of claims 1 to 3, d a d u r c h g e k e n n n z e i c h n e t that the metal helix (2, 4, 5) consists of a metal band consists. 5. Plastic hose according to one of claims 1 to 4, d a d u r c h e k e n n n n e i c h n e t that the metal helix (2, 4, 5) is made of chrome. 6. Plastic hose according to one of claims 1 to 5, d a d u r c h g e k e n n n n e i c h n e t that the metal coil consists of two layers, of which the first is applied chemically and the second is electroplated.