Heart valve prosthesis

FIELD: medicine.

SUBSTANCE: invention relates to field of medicine and can be applied in cardiosurgery in operations aimed at replacement of natural heart valves. Prosthesis includes ring-shaped body, limited with upper and lower butt-ends, installed in body with possibility of rotation in order to form clearing section and its blocking locking element made in form of convex-concave cusps, and fold movement limiting elements. In each cusp rectangular slot is made. Fold movement limiting elements are made in form of hook-like protrusions, which have rectangular cross-section for interaction with through slots of folds during their closing or opening. Elements limiting cusp motion are supplied with supports for limitation of fold turning, and in upper butt-end of the body turns are made for interaction with folds when opening or closing and formation of limited reverse blood flow in state of fold closed state.

EFFECT: increase of reliability of fold holding during travel.

6 cl, 4 dwg

 

The technical field

The present invention relates to medicine, in particular for cardiovascular surgery, and is intended to replace a diseased natural heart valves during cardiac operations.

The level of technology

The most popular design of the prosthetic heart valve at the present time remains the case with repeated inside bore leaves. Such prostheses have high reliability and provide satisfactory hemodynamics, improvements reduce acoustic noise, anxiety patients, increase uptime. Standard dentures include the housing has a circular shape. One or more valves are installed in the housing with the possibility of repetition between an open position to direct transmission of blood flow and a closed position for covering the channel and restrict the return flow of blood. In addition, the prosthetic heart valve includes a connecting mechanism for connecting the valve body with the surrounding tissues of the heart. Basically, this mechanism is made in the form of a cuff, which is attached to the tissues of the heart and covers the side surface of the housing of the valve prosthesis. An important problem is the problem of secure retention of the valves in the housing. For this purpose various types of hinges, rancitelli move and rotate the valves.

The prior art solutions that reduce the probability of valve failure due to inadequate fixation of the valves (see, for example, published application U.S. No. 2007193632). In the open here prosthesis sash rotate on an axis fixed in the body and intersecting the flow area at the center. However, in this valve is significantly distorted hemodynamics due to the overlap of the center bore in the open position of the valve.

The number of known structures (see U.S. patent 4274437, RF patent 2066984) ensuring primary zone flow area in the center. With this arrangement, it is obvious that the Central part of the flow through the valve remains weakly perturbed, and distortion introduced shutters, minimum. However, these valves in surgical practice are not applied due to the low reliability and a high probability of falling leaves. As it turned out, the main difficulties rearranges the development of such travel stop valves that would reliably and throughout the service life of valve kept sash and contributed to the smooth operation of the valve.

Thus, the obvious need for a new design of a prosthetic heart valve, the reliability of which could be combined with undistorted hemodynamics of blood flow.

The closest analogue to the present invention is an artificial heart valve(international publication WO 91/07148), containing the annular body and three leaf, placed in it can be rotated between the upper and lower flow of blood restrictors folds and formation of the primary zone flow area in the center, limited all portions of the inner walls of the casing and the lower downstream edges of the shutters.

The invention

The present invention is directed to solving the problem of creating an artificial heart valve that eliminates the disadvantages of the known analogues, namely, providing high reliability and durability with the primary zone flow area in the center of the prosthetic heart valve.

Technical result achieved when using the present invention is to improve the reliability of retention of the valves during the move.

The technical result is achieved due to the fact that the prosthetic heart valve including an annular housing, limited upper and lower ends mounted in the housing can be rotated for the formation of a bore and it is closed, the locking element made in the form of a convexo-concave valves and restrictors folds, each fold is made rectangular groove, the restrictors shutters made in the form of hook protrusions that have a rectangular piperacetazine to interact with through the slots of the valves when they are closed and opened, when the sash restrictors fitted with stops to limit rotation of the valves, and in the upper end of the body is made grooves for engagement with the sash during opening and closing and education limited reverse flow of blood in the closed state of the valves.

The technical effect is enhanced due to the fact that the locking element is designed as three folds. The restrictors shutters made in the form of three hook the tabs on the upper end of the body. Grooves are located under each hook protrusion of the stroke limiter.

The casing from the outer side has an annular groove for fastening sewn cuffs. The body and wings are made of pyrocarbon.

The list of drawings.

The invention will be clearer from the description below with reference to the positions of the drawings, where

figures 1 and 2 show the prosthetic heart valve with closed doors, respectively, a front view and a top view,

figure 3 and 4 shows the prosthetic heart valve with open shutters, respectively the front view and top view.

Information confirming the possibility of carrying out the invention

The prosthetic heart valve includes an annular casing 1, made of pyrocarbon and having three convex-concave sash 2, also made of pyrocarbon and with the possibility p. the gate and education primary zone flow area in the center, installed in the housing 1. The annular body 1 is limited to two upper 4 and lower 5 ends (the direction is determined in accordance with the direct blood flow through the valve). Each of the leaf 2 has a rectangular cross-cutting groove 6. Limiters 3 stroke 2 folds made in the form of three hook projections 7, which in cross section are rectangular in shape and interact with through the slots 6 of the respective valves 2 are opened and closed. The stops 3 are located on the top end 4 of the housing 1 and provided with lugs 8 to limit rotation of the valves 2. On the upper 4 end of the body 1, there are three grooves 9 that are essential for interaction with a corresponding shutter opening and closing and education limited reverse flow of blood in the closed state of the valve.

The housing 1 from the outer side has an annular groove (not shown) for fastening sewn cuffs. Grooves 9 are located under each hook protrusion of the stroke limiter.

The prosthetic heart valve operates as follows.

When opening the valve prosthesis under the action of the direct flow of blood is turning the valves 2, they are held securely hook the tabs 7, interacting with rectangular grooves 6 each sash 2. Turn the sash 2 limit stop 8, which interacts with the outer surface the values of the sash 2. This rotation occurs to the position of the equilibrium state. While the blood flows in the forward direction, the Central part of the valve housing 1 of the valve freely without distortion skip the thread. Shutters are arranged almost vertically and do not create resistance to flow. The stops 8 and grooves 9 securely hold the sash in the open position. Perform exterior shutters convexo-concave provides a still further opening of the valve. At the termination of the direct flow of the leaf 2 begins to turn around and return to its original position before touching each other. The outer bottom edge of the valves communicate with the grooves 9, which are made each hook protrusion 7, limited reverse flow of blood that occurs when closing the valve, washes the inner part of the hook protrusions 7 and the upper end face 4.

The declared design of artificial heart valve has the following advantages:

1. Completely eliminates the loss of the valves by performing the restrictors hook with stops.

2. Provides high efficiency orifice valve, almost without resistance to flow in the open position of the valves.

3. Eliminates the formation of stagnant zones due to washing of the layout areas of the limiters is Otok and stops the forward and backward flow of blood.

4. Significantly reduces the factor of thrombosis.

5. Eliminates the instability of the valve when opened by performing external surfaces of the valves convex-concave.

7. Has high reliability and durability, good compatibility with natural fabrics.

1. The prosthetic heart valve including an annular housing, limited upper and lower ends mounted in the housing can be rotated for the formation of a bore and it is closed, the locking element made in the form of a convexo-concave valves and restrictors of the valves, wherein each fold is made rectangular groove, the restrictors shutters made in the form of hook protrusions that have a rectangular cross-section for interaction with end-to-end grooves of the valves when they are closed and opened, the sash restrictors fitted with stops to limit rotation of the valves, and in the upper end of the body is made grooves for interaction with leaves when opening and closing and education limited reverse flow of blood in the closed state of the valves.

2. The prosthesis according to claim 1, characterized in that the locking element is designed as three folds.

3. The prosthesis according to claim 1, characterized in that the restrictors shutters made in the form of three hook protrusions, RA is displaced on the upper end of the body.

4. The prosthesis according to claims 1 and 3, characterized in that the grooves are located under each hook protrusion of the stroke limiter.

5. The prosthesis according to claim 1, characterized in that the housing from the outer side has an annular groove for mounting sew cuffs.

6. The prosthesis according to claim 1, characterized in that the casing and sash made of pyrocarbon.



 

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