RU2352291C2 - Device for implantation in blood vessels and its versions - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: invention concerns medicine, in particular to vascular surgery. The device for implantation in blood vessels is executed in the form of a body of rotation of cellular structure with a filtering element and an agent for extraction. The device contains the additional filtering element executed from a blood-permeable material and densely bridged to an internal surface of the filtering element. In the second version of the performance the additional filtering element is densely bridged to the filtering element on a circle of its basis.

EFFECT: invention allows counteracting reliably to penetration of thrombembols in distally located vessels at the expense of increased filtering ability.

3 cl, 3 dwg

Description

The invention relates to medicine, in particular to vascular surgery.

A known design of a cava filter made in the form of two coaxially mounted elastic spirals with catching threads of absorbable material intersecting each other in the center / cm. RU patent No. 2094063, 1997 /.

Known intravenous filter, made in the form of a body of revolution from the wire elements forming the cell, and having traction for its extraction / see Description of the invention to the application RU No. 94014593, 1993 /.

Known intravascular stent filter, made in the form of a body of rotation of the cellular structure with the possibility of the formation of a filter element located either inside the stent or outside, and having a means for extraction / see patent RU No. 2143246, 1999, prototype /.

A common disadvantage of the known devices is the low capture / filtering / ability of the smallest thromboembolas with a size of 100-200 microns. As a result, the latter can penetrate through the cells of the body of revolution into the vascular bed. This in turn can lead to embolism of distally located vessels, causing thrombosis of the arteries of the head, heart, kidneys, lower extremities or pulmonary thromboembolism.

The objective of the claimed technical solution is to create a device that will eliminate the disadvantages of the known solutions and increase the technical characteristics by increasing the filtering ability of the device, which will favorably affect the quality of operations of angioplasty and stenting of the carotid and coronary arteries, arteries of the kidneys and lower extremities and with pulmonary thromboembolism .

To solve this problem, the known device for implantation in blood vessels, made in the form of a body of revolution with a cellular structure with a filter element and means for extraction, has an additional filter element, which is made of a blood-proof material, is located inside the main filter element and is tightly connected to it. Alternatively, the additional filter element can be tightly connected to the filter element around the circumference of its base. To remove the device from the vascular bed, flexible traction is used with a loop or hook at its end, interacting with the extraction tool.

This embodiment of the device significantly increases its technical characteristics due to the possibility of trapping microembolism.

Figure 1 shows the claimed device, a General view. The additional filter element is tightly connected to the inner surface of the filter element.

On figa - the same. The additional filter element is tightly connected to the filter element around the circumference of its base.

Figure 2 - flexible traction with a loop at its end.

Figure 3 is the same with the hook.

The device for implantation into blood vessels is made in the form of a honeycomb structure rotation body 1 with a main filter element 2 and extraction means 3. An additional filter element 4 made of blood-tight material is located inside the main filter element 2 and is tightly connected to its inner surface. Alternatively, the additional filter element 4 can be tightly connected to the main filter element 2 around the circumference of its base. To remove the device from the vascular bed, a flexible traction 5 with a loop 6 or a hook 7 at its end is used to interact with the extraction tool 3.

Work with the device for implantation is as follows.

The device is placed in a hollow tube (not shown) and delivered through the puncture of the vessel distal to the affected segment (if used in the arterial system), then the device is pushed out of the tube into the lumen of the vessel, where it is self-fixed in the planned place. Then angioplasty and stenting of a proximal located vessel lesion are performed without fear of distal thromboembolism. The removal of the device is carried out by the interaction of the flexible rod 5 with a loop 6 or hook 7 with a means for extracting 3.

The presence of an additional filter element 4 allows you to reliably counteract the penetration of thromboembolas into distally located vessels, thereby ensuring the quality of the operation and increasing the safety of the patient.

Claims (3)

1. Device for implantation in blood vessels, made in the form of a body of revolution of the cellular structure with a filter element and a means for extraction, characterized in that it has an additional filter element made of a blood-proof material and tightly connected to the inner surface of the filter element. 2. A device for implantation into blood vessels, made in the form of a body of revolution of a cellular structure with a filter element and extraction means, characterized in that it has an additional filter element made of a blood-proof material and tightly connected to the filter element around the circumference of its base. 3. The device according to any one of claims 1, 2, characterized in that the extraction is carried out by interacting with a flexible rod with a loop or hook at its end with extraction means.

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