RU174969U1 - FRAME OF BIODESINE INTEGRATED INTRAVENOUS FILTER - Google Patents

Abstract

The utility model relates to medicine, namely to the frames of biodegradable intravenous filters, and can be used in x-ray surgery to capture blood clots in blood vessels. The proposed framework of a biodegradable intravenous filter is formed by a zigzag element (as shown in Fig. 2) with at least four bends having through holes in the upper part of the bends on one of the sides, as well as at least one thread threaded through these holes with the formation of weaving (as shown in Fig. 3).

Description

FIELD OF TECHNOLOGY

The utility model relates to medicine, namely to the frames of biodegradable intravenous filters, and can be used in x-ray surgery to capture blood clots in blood vessels.

BACKGROUND

A frame of an intravenous filter (CN202908879 U) is known, in which the frame has an upper part and a lower part, a part where the lower part contains a set of elements bent at an angle, and the upper part contains threads comparable in number to the ends of one of which are connected to two ends from two different curved elements at one point, and the ends of the other side of the threads are interconnected at one point. A well-known utility model is selected as a prototype. Also, the technical solution chosen as a prototype was disclosed by the inventors in the DOI article: http://dx.doi.org/10.1016/j.asjsur.2015.05.002).

A disadvantage of the known framework is that the threads used are thick and form turbulent blood flow. In addition, the frame contains a large number of nodes for mounting threads both to each other and to curved elements, which degrades and distorts the physicomechanical properties of the stretched thread.

The proposed utility model avoids the above disadvantages of the prototype.

DISCLOSURE OF A USEFUL MODEL

 The problem to which the proposed utility model is directed is to create a new framework for a biodegradable intravenous filter containing threads of a simpler design that provide effective trapping of thrombotic masses, but do not form turbulent blood flow.

  The technical result achieved when using the utility model is to provide a minimal effect on hemodynamics in the vessel while maintaining filtration and retention of thromboembolas, as well as increasing the reliability of fixing the filter frame in the vessel.

The task and the required technical result are achieved by the fact that

BRIEF DESCRIPTION OF THE DRAWINGS

In FIG. 1 - presents the construction of a frame known from the prior art (DOI article: http://dx.doi.org/10.1016/j.asjsur.2015.05.002).

In FIG. 2 - presents a view of the proposed frame without threads.

In FIG. 3 - presents a view of the proposed frame with threads 3.

IMPLEMENTATION OF A USEFUL MODEL

The frame (FIG. 2) is formed by a Z-shaped curved element 1 with through holes 2 in the upper part into which at least one thread 3 is inserted as shown in FIG. 3. The threaded thread 3 lies in the same plane and intersects with itself in the region of the central longitudinal axis of the frame. All frame elements are made of biodegradable material.

Used threads have a diameter of 0.15-0.199 mm, which allows them not only to effectively capture thrombotic masses, but also not to form turbulent blood flow. A special pattern of weaving yarn 3 is proposed in order to reduce the number of nodes that degrade and distort the physical and mechanical properties of the stretched yarn. In FIG. 3, the end point of the thread is not shown for ease of display. One node can fix the thread 3 to the Z-shaped curved element 1 in one place.

The frame design of the proposed option biodegradable intravenous filter provides a uniform tight fit of the Z-shaped curved element 1 to the walls of the vessel. Reliable fixation of the frame excludes the presence of peristalsis and skew of the frame in the bloodstream.

The design of the frame and the use of threads allows you to achieve a minimal effect on hemodynamics in the vessel while providing filtration and retention of thromboembolas.

The proposed frame design of a biodegradable intravenous filter allows, if necessary, prolongation (prolongation) of anticoagulant therapy by installing an additional, identical to the described, biodegradable intravenous filter inside the already implanted, and not sequentially. A similar technique can also be used to create a denser mesh of surgical sutures if necessary or in case of resorption of sutures, if necessary, filtering and holding thromboembolas.

Parameter Name Value 1. The length of the frame, mm (20 ... 40) 2. The diameter of the cross section of the frame, mm (20 ... 40) 3. The diameter of the Z-shaped curved element 1, mm (0.2 ... 0.5) 4. The bending angle of the Z-shaped element 1, degrees 45-85

The intravenous filter frame is synthesized from a biodegradable amorphous or partially crystalline polymer material based on L-lactide and / or D-lactide and / or glycolide and / or e-caprolactone and / or p-dioxanone and / or trimethylene carbonate with a molecular weight of from 50,000 up to 400,000 Yes. Products from the material have elasticity, due to which the frame of the intravenous filter is fixed inside the vein and its degradation in the bloodstream. Micro- and nanoparticles of biocompatible fillers of various nature can be introduced into the polymeric material, giving higher physical and mechanical characteristics and / or X-ray contrast properties.

Fabrication of the structure is carried out using additive manufacturing technologies and / or using a laser and / or injection molding of products in a mold. The structure is cleaned of support material manually. Through holes 2 can be produced by laser firmware or by contact method (drilling, hot flashing). Threading of thread 3 or thread 3 will be carried out, in the conditions of serial and mass production, with special knitting machines. Next, the frame of the intravenous filter is inserted into the catheter-introducer sheath with a diameter of 5 F - 20 F (french) and the device is sterilized, both assembled and opened. Prior to sterilization, the device is packaged in a sealed sterilization package.

Implantation of the intravenous filter cage is carried out after a diagnostic study that established pulmonary embolism or float thrombosis of the lower hollow, deep veins of the lower limb, iliac or femoral veins, as well as in patients with repeated pulmonary embolism with an undetected source of relapse.

An intravenous filter is implanted in the inferior vena cava with the lumen of the catheter cap downward so that the bends of the zigzag element (they can also be described as “spacer rods”) are located below the mouth of the renal veins at the level of the intervertebral disc L1-L2 and the upper edge L2 of the vertebra. When implanting the device, percutaneous catheterization of the subclavian, right internal jugular or femoral veins is used.

A wired Teflon cannula is installed below the mouth of the renal veins. In the case of emergency access, the IF is inserted into the conduction cannula with the legs forward, in the case of extra-subclavicular or extrajugal access, the lumen of the metal cap is facing down. When pushed through an implant catheter, the intravenous filter is in a compressed state. When the inferior vena cava reaches the loop-pusher, the filter is passed through the lumen of the cap into the vascular bed, where it opens, and the bends of the zigzag element (they can also be described as “spacer rods of the upper and lower tier”) abut against the walls of the vein. Then, by moving in the opposite direction, the filter is fixed with hooks to the vein wall. Then the extractor is removed, and a control contrast of the inferior vena cava is performed.

The wire cannula is removed, the bleeding is stopped by finger pressing of the puncture site.

Although the present utility model has been described in detail with examples of options that appear to be preferred, it must be remembered that these embodiments of the utility model are provided only to illustrate the utility model. This description should not be construed as limiting the scope of the utility model, since the described construction of the frame and the stages of its preparation by specialists in the field of medicine, chemistry, physics, etc. can be amended to adapt them to specific frame designs or situations, and not beyond the scope of the attached utility model formula. The person skilled in the art understands that within the scope of the utility model, which is determined by the claims of the utility model, various options and modifications are possible, including equivalent solutions.

Claims (1)

The frame of a biodegradable intravenous filter formed by a zigzag element (as shown in Fig. 2) with at least four bends having through holes in the upper part of the bends on one of the sides, as well as at least one thread threaded through these holes with the formation of weaving (as shown in Fig. 3).

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