ES2572733B1 - Temporary stent catheter - Google Patents

Abstract

This invention consists of a catheter comprising a stent (5) associated with a rigid cannula (1) in which two sections are distinguished, one with a smaller wall thickness (2) corresponding to the area of the catheter that is inserted into the catheter. artery (7), and a section with a greater wall thickness (3) that incorporates a path or coupling (4) for the suction line.

Description

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DESCRIPTION

Catheter with temporal endoprotesis OBJECT OF THE INVENTION

The object of the present invention is a catheter that incorporates a temporary endoprotesis, commonly called Stent, usable in those surgeries in which it is necessary to conduct the blood from the patient's body to a bypass equipment, from which it is re-entered into the body.

BACKGROUND OF THE INVENTION

In coronary surgery and related surgeries, venous cannulas are used to conduct blood from the body to a shunt, whose outer diameter must be in order with the blood vessels in which the intervention is to be performed.

These cannulas are constituted by a narrow and elongated tube that can be introduced into the vein or artery, and have a plurality of perforations through which blood enters the cannula to be extracted.

These cannulas have the disadvantage of limiting the flow of blood in the artery, by occupying part of their space.

The solution conventionally applied to this problem is to perform the extraction under the action of a vacuum or suction in the artery. However, this technique has limitations in terms of the extractable volume per unit of time, since without changing the lumen of the cannula, the only possibility of increasing the volume of blood drawn is by increasing the flow rate, and this increase cannot be made indiscriminately, since the depression produced inside the vein causes the tissue to adhere to the outer surface of the cannula and obstruct its perforations.

On the other hand, an endoprotesis or stent is a device that is used to open veins that have been previously blocked or blocked. An example of this technology is the MXPA03008465 patent.

DESCRIPTION OF THE INVENTION

The novel catheter presents an ingenious configuration that allows to increase the volume of blood drawn from an artery to equal suction values.

The proposed technical solution is highly ingenious and consists in inducing a temporary increase in diameter in a section of the artery also increasing resistance to

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throttling of this, so that the area acts as a deposit of blood accumulation in which the suction acts eliminating the possibility of obstruction of the catheter with arterial tissue.

For this, the new catheter includes:

• A rigid cannula in which a section with a smaller wall thickness corresponding to the area of the catheter that is introduced into the artery is established, and a section with a thick wall thickness that incorporates a path or coupling for the suction line .

• An endoprotesis constituted by a double metal spiral, the spirals being arranged in the opposite direction, one with a direction of rotation to the left and another with a sense of rotation to the right, said helices crossing perpendicularly when they adopt their extended position and presenting their distal end braided and encapsulated in a conical terminal.

The endoprotesis is associated with the cannula immovably, its wall being embedded along the entire section of smaller thickness, with which the endoprotesis itself reinforces its stiffness, and in a part of the thick wall section.

The structure of the double spiral allows the diameter of this can decrease by flexing the metal rods that compose it, so that when the flexion force is stopped exerting, they recover their original position by applying against the internal walls of the vein and expanding these along the entire scope of the endoprotesis, which significantly increases the internal volume of the section of the affected artery as well as its stiffness to crushing.

This increase in volume causes a significant amount of blood to accumulate that can be absorbed more advantageously than in a conventional cannula.

DESCRIPTION OF THE DRAWINGS

Figure 1 shows a preferred embodiment of the new catheter advantageously applied in an artery.

Figure 2 shows a detail of the crossing of the spirals of the endoprotesis.

PREFERRED EMBODIMENT OF THE INVENTION

According to the principles of the invention, the novel catheter comprises a rigid cannula (1) with a first section with a smaller wall thickness (2) and a second section with a larger wall thickness (3) incorporating a coupling (4) for the suction line.

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It also comprises an endoprosthetic (5) constituted by a double metal spiral, the spirals being arranged in the opposite direction, some with a direction of rotation to the left (5a) and another with a sense of rotation to the right (5b), said helices crossing in a way perpendicular when they adopt their extended position and presenting their braided and encapsulated distal end in a conical terminal (6).

The endoprotesis (5) is associated with the cannula (1) immovably, its wall being embedded along the entire section of smaller thickness (2) and in a part of the thick wall section (3).

The catheter is inserted inside the artery (7) through an incision made in it, introducing the entire section of smaller thickness (2).

The endoprotesis (5) is applied against the internal walls of the artery (7) by exerting pressure on them, resulting in a sensitive widening of the vein (8) along the entire section affected by the endoprotesis (5), while the suction point (9) of the cannula (1) is protected from any possible obstruction with the vein tissue.

REFERENCE LIST

1. Rigid cannula

2. Lower wall section

3. Major wall section

4. Coupling

5. Endoprotesis 5a. Spirals to the right 5b. Left spirals

6. Conical terminal

7. Artery

8. Widening vein

9. Cannula suction point

Claims (1)

1.- Catheter with temporal endoprotesis characterized essentially because it comprises: • A rigid cannula (1) in which a section with a smaller wall thickness (2) corresponding to the area of the catheter that is introduced into the artery (7), and a section is established 5 with a greater wall thickness (3) incorporating a track or coupling (4) for the suction line. • An endoprotesis (5) consisting of a double metal spiral, the spirals being arranged in the opposite direction, one with a direction of rotation to the left (5a) and another with a direction of rotation to the right (5b), said helices crossing perpendicularly 10 when they adopt their extended position and presenting their braided distal end and encapsulated in a conical terminal (6). Since the endoprotesis (5) is associated with the cannula (1) immovably, its wall being embedded along the entire section of smaller thickness (1) and in a part of the greater wall section (3).