DE8524283U1 - Guidewire for catheters for blood vessels - Google Patents

Description

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Guidewire for catheters for blood vessels

The innovation relates to a guide wire for catheters for Blood vessels.

It is used to introduce flexible catheter tubes into blood vessels

, necessary to use guidewires. These guidewires are in the

10 Usually stiffer than the catheter tube. The catheter tube is * Neither with the internal guide wire together in the air vessel in

the desired end position or the guide wire is pushed first alone advanced to the desired end position and the catheter [ tube is then pushed onto the guide wire. After reaching the

The guide wire is moved backwards out of the catheter tube, that is, in the direction of the examiner, pulled out. It is at'ch common to combine both approaches, e.g. in the presence of Narrow points or tight bends in the vessel to be catheterized, the guide wire is pushed forward until the difficult Passage is overcome, and then the catheter tube is fed.

The slight mutual limitation is important in these approaches sliding between guide wire and catheter tube.

It is well known that narrow-lumen catheters can be moved to one side 25 tubes and internal guide wire either by adding its lubricant or by roughening the surface of the guide wire to improve. In DE-GM 73 39 112, for example, a catheter tube is used

disclosed with an inner mandrel which is provided with micro-roughness, which are produced, for example, by corrugation, in US Pat. No. 3,948,273, an endotracheal probe with an internal suction catheter tube is described. For better mutual displacement, the sonic tube has longitudinal grooves on the inside, which are separated from one another by sharp-edged ridges. Lubricating by adding a lubricant is regarded as disadvantageous, since there is a risk that foreign substances are supplied to the patient's body 35, The roughening of the FDhrufigs- ψ wiry and sharp edges carry the risk of increased thrombi "

r education in itself.

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It has now been found that the mutual displaceability of the catheter tube and Mandfin thereby considerably improved in a simple manner without increasing the risk of thrombus formation by the The stylet has a polygonal cross-section, below a polygonal one In connection with the present innovation, the cross-section is a four- to twelve-cornered, preferably six- to octagonal, cross-section understood, wherein all angles of the cross-sectional polygon are less than 160 °. The cross-sectional polygons are preferably equilateral. To further The edges of the can reduce the risk of thrombus formation

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The subject of the innovation is therefore a guide wire for catheters for Blood vessels, which are characterized by their polygonal cross-section. Preferred subjects emerge from the subclaims.

Practical tests have shown that the catheters with guide wire known problems of poor displaceability with the newly designed polygonal guide wire do not even occur, when the catheter is inserted into blood vessels with sharp curves.

The production of a guide wire according to the invention can be based on known manner, for example by extrusion from a nozzle shaped according to the polygonal cross-section of the guide wire. Intended to a guide wire according to the invention can be equipped with a stiffening core (wire core), so this can be produced by co-extrusion will. Alternatively, it is possible to manufacture a plastic hose with a polygonal cross-section into which a stiffening core, e.g. a steel wire is inserted.

The length and diameter of a guide wire according to the invention are arbitrary variable and adapted to the desired purpose. For the guiding properties of a guidewire is the design of the user-remote end piece is of particular importance. For example, a guide wire with a stiffening core (wire core) can be produced in which the stiffening core is a certain distance in front of the examiner End of the guide wire ends. Such a guide wire with a stiffening core is described in DE-PS 31 09 402. It

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can also be a guide wire with an approximately semicircular curved uni'ersucherfernem End piece are produced, as it is contained, for example, in the catheter set according to EP-Ai-0 082 504.

The new guidewire is all medical Jiwecke suitable extrudable plastics, such as polyolefins, Polyamides, especially polyamide 11W, as well as fluorinated plastics Ütoffe, such as TEF, PVDF, PTFE or ETFE, in question.

The innovation is explained in greater detail below with the aid of exemplary embodiments explained.

Fig. 1 shows schematically a guide wire in perspective

2 shows the bent end of a guide wire remote from the examiner

Fig. 3 shows a cross section through a hexagonal guide wire.

The cross section of the guide wire 1 in Fig. 1 is a regular one Hexagon, the distal end 2 remote from the examiner being rounded. The hexagonal cross section goes near the distal end 2 in a circular cross-section across. The (proximal) end 3 is designed as a handle button.

In Fig. 2, the distal end piece of a guide wire 1 is shown, the has an approximately semicircular bend 5. Guide wires with a curved distal end are known as J-Guide. Of the hexagonal cross-section merges into a circular cross-section before the beginning of the bend 5. The guide wire 1 is through a stiffening core 4 reinforced, which ends before the beginning of bend 5.

Fig. 3 shows a section through a guide wire 1 with a hexagonal Cross section which has a stiffening core 4.

Claims (9)

S3g DEG .'... '' "'' - ♦" - '··' ··· '08850 claims 1. Guide wire for catheters for blood vessels, characterized in that that the guide wire 1 has a polygonal cross section. 2. Guide wire according to claim 1, characterized in that the cross-section is quadrangular to twelve-sided. 3. Guide wire according to claim 2, characterized in that the cross-section is hexagonal to twelve-sided. 4. Guide wire according to one of claims 1 to 3, characterized in that that the cross-sectional polygon is equilateral. 5. Guide wire according to one of claims 1 to 4, characterized in that that the corners of the cross-sectional polygüne are rounded. 6. Guide wire according to one of claims 1 to 5, characterized in that that the guide wire (1) has a stiffening core (4). 7. guide wire according to claim 6, characterized in that the stiffening core (4) ends in front of the end of the guide wire (1) remote from the examiner. 8. Guide wire according to one of claims 1 to 7, characterized in that that the end of the guide wire (1) remote from the examiner has an approximately semicircular bend (6). 9. Guide wire according to one of claims 1 to 8, characterized in that that the end of the guide wire distant from the examiner! 1) is rounded. 10, guide wire according to one of claims 1 to 9, characterized in that that the polygonal cross-section of the guide wire (1) in front of the end to be examined in a circular cross-section over = goes.