RU94453U1 - CORONARY STENT DELIVERY - Google Patents

Abstract

 A delivery device for a coronary stent in the form of a catheter tube with radiopaque marks having a dilatation segment, a shaft for the first coronary conductor, a shaft for contrast medium, a through passage extended for the second coronary conductor, characterized in that the latter is made in the form of a flexible tube with a length of about 20-30 cm with the entrance from the proximal side of the dilatation segment directly in front of it.

Description

The utility model relates to medical equipment, namely to medical and surgical instruments and cardiac surgery. It can be used to eliminate stenosis of coronary arteries in a hospital of cardiological and cardiosurgical units while providing highly professional surgical care in emergency conditions.

The delivery device for the coronary stent is a balloon catheter on which the coronary stent is fixed.

Known delivery devices for coronary stents used in endovascular cardiac surgery [Coronary angioplasty. Babunashvili A.M., Rabkin I.Kh., Ivanov V.A. - M .: DIA Publishing House, 1996. - 352 pp., Ill.], Which have two lumens: a central one for introducing a coronary conductor and an additional one communicating with the balloon segment of the catheter for introducing a contrast medium. The diameter of the base catheter ranges from 1.5 F (for single lumen balloon catheters to 4.3 F (for double lumen catheters). The length of balloon catheters varies from 115 to 135 cm.

The balloon catheter has a balloon segment at the distal end, its length is from 10 to 40 mm, the diameter of the balloon segment of the catheter ranges from 1.5 to 4.2 mm. The main materials used for the manufacture of balloon segments of catheters are polyethylene (PET) and polyvinyl chloride (PVC). An important characteristic of a balloon catheter is the ratio of the balloon segment (in the collapsed state of the balloon) and the diameter of the base catheter. The main types of delivery devices used in clinical practice can be divided into two groups:

- double-lumen balloon catheters (“balloon on the conductor”), when using which it is possible to separately conduct the coronary conductor into the central lumen of the catheter and independently control the conductor.

- monorail balloon catheters that do not have a double lumen throughout, their conductor shaft ends at a distance of 6-8 cm from the distal tip of the catheter.

With all the variety of design features, all balloon catheters have one common detail: the presence of a single shaft for the coronary conductor.

A double-lumen balloon catheter is also known [Coronary Angio-Plastic. Babunashvili A.M., Rabkin I.Kh., Ivanov V.A. - M .: DIA Publishing House, 1996. - 352 p.]. It has a central guide shaft extending along the entire length of the balloon catheter, and a shaft for supplying contrast medium to the balloon segment.

However, it also excludes the possibility of stent delivery to the site of stenosis simultaneously along two coronary conductors.

The closest analogue to the claimed utility model is a delivery device for a coronary stent [RU patent for utility model No. 23561]. It is made in the form of a catheter tube with radiopaque marks having a dilatation segment, a shaft for a coronary conductor, a shaft for a contrast medium and a through longitudinal elongated passage for a second coronary conductor. The latter serves during the doctor’s manipulation of installing the stent with an improvised passage under the mesh of the stent on the outer shell of the delivery device in the form of a longitudinal groove deepened into the body of the dilatation segment along its entire length.

The disadvantage of this device is the ability to use it only to eliminate bifurcation stenosis of the coronary artery.

The objective of the utility model is to develop a device that acts as a delivery for the coronary stent in the places of the mouth stenosis of the coronary arteries, ensuring the accuracy of the stent positioning.

The essence of the claimed utility model is that in the delivery device for the coronary stent in the form of a catheter tube with radiopaque marks having a dilatation segment, a shaft for the first coronary conductor, a shaft for contrast medium, a through passage extended for the second coronary conductor, the latter is made in in the form of a flexible tube with a length of about 20-30 cm with an entrance from the proximal side of the dilatation segment directly in front of it.

The technical result of the proposed solution is the ability to accurately position the stent directly at the mouth of the artery, or in place immediately after the departure of the lateral artery. The technical result is achieved by the technical method, which consists in the development of a special construct: the implementation of a through long passage for the second coronary conductor in the form of a tube with an entrance from the proximal side of the dilatation segment directly in front of it. In addition, unlike the closest analogue, the through passage is not made in the stent, not in its cell, but is moved outside it, which does not deform the stent and does not increase its transverse profile. The tube for the second conductor is located on the base tube, inside which there are two shafts, one for the first coronary conductor and the second for the contrast medium. The tube length for the second conductor is shorter than the shaft for the first coronary conductor.

The inventive delivery device for a coronary stent is illustrated using Fig., Where the positions denote: 1 - coronary conductor, 2 - shaft for the first coronary conductor, 3 - stent, 4 - dilatation (balloon) segment, 5 - flexible tube for the second coronary conductor, 6 - place of entry of the second coronary conductor.

The inventive delivery device for a coronary stent includes a catheter tube with radiopaque marks made of polyethylene or polyvinyl chloride. The catheter tube has a shaft 2 for the first coronary conductor 1, a shaft for contrast medium, a dilatation segment 4 added to the device in the claimed solution, the flexible tube 5 for the second coronary conductor, located on the base tube. The length of the flexible tube 5 is 20-30 cm. The introduced tube 5 has an entrance from the proximal side of the dilatation segment 4 directly in front of it.

In the process of using it in practice, the inventive delivery device with a stent 3 fixed on it is installed in the place of stenosis of the coronary artery along two coronary conductors, one of which 1 is carried into the main artery, and the second into the lateral artery. The coronary conductor 1, standing in the main artery, passes through the shaft 2 for the first coronary conductor 1, and the conductor, standing in the lateral artery, passes through the flexible tube 5. Then, the delivery device with the stent 3 fixed on it is delivered to the stenosis of the main artery and stent 3 is implanted into the main artery by swelling of the dilatation segment 4 of the catheter tube. After the implantation of the stent 3 is completed, the procedure is completed by removal of the catheter tube with the flexible tube on it and two conductors from the coronary arteries added in this solution.

Example.

The inventive utility model is additionally constructively worked out as a model in the conditions of the scientific laboratory of the Saratov Scientific Research Institute of Cardiology.

Claims (1)

A delivery device for a coronary stent in the form of a catheter tube with radiopaque marks having a dilatation segment, a shaft for the first coronary conductor, a shaft for contrast medium, a through passage extended for the second coronary conductor, characterized in that the latter is made in the form of a flexible tube with a length of about 20-30 cm with the entrance from the proximal side of the dilatation segment directly in front of it.