Venous valve prosthesis

FIELD: medical engineering.

SUBSTANCE: device has cylindrical body and locking disk member mounted therein with rotation about axis displaced relative to diameter being in parallel to it. Disk member center of gravity is deviated relative to its geometrical center and set so that its rotation axis passes through the center of gravity and the member itself is engageable with opposite device body ends in closed state. The device body has locking disk member stroke stopper manufactured as prominence located between the locking disk member rotation axis and device body diameter arranged in parallel to the rotation axis.

EFFECT: enhanced effectiveness of operation; reduced force magnitude needed for opening the locking member; maximum effective cross-section in open position.

6 cl, 1 dwg

 

The invention relates to medicine, in particular to prosthetic devices for the circulatory system.

Famous prosthetic venous valve containing cylindrical body and placed in it the disk locking element provided with a return spring to ensure that the movement of the locking element for overlapping section of the valve (US 4851001, 11 /1/).

A disadvantage of the known valve is the complexity and unreliability of construction and the risk of blood clots on spring elements.

Famous prosthetic venous valve containing cylindrical body and placed inside two drop-down doors, fixed on the axis specified by the diameter of the circumference of the body (US 4851001, 3 /2/).

A disadvantage of the known valve is the instability of its mechanical characteristics, due to the method of attachment of the valves on the axis. This type hinges or have increased friction (small gaps), or have the backlash (with large gaps). In addition, with large gaps in them can get particles of blood, be damaged and cause difficulty in turning the leaves.

Closest to the claimed by its technical essence is a prosthetic venous valve, known from RU 2129847 /3/. Known prosthesis includes a circular casing and disk locking element mounted in the housing with the possibility of the chief is the one. The body is made open with the ability to track changes in size of the blood vessel, the axis of rotation of the locking element is displaced relative to its axis of symmetry at 1-15% of its diameter, and the locking element is made from a material whose density equal to the density of blood.

A disadvantage of the known valve is not sufficiently high efficiency, due to its design features. In particular, the resistance to opening of the shut-off element is relatively high due to the imbalance of its center of mass about the axis of rotation.

Claimed as the invention a prosthetic venous valve aims to increase its efficiency through reduction efforts at the opening of the shut-off element and providing the best possible living section in the open position.

This result is achieved in that the prosthetic venous valve comprises a cylindrical housing and mounted therein can be rotated around an axis that is offset parallel to the diameter, the locking disk element, which is made with a center of mass that is offset from its geometric center and installed so that the axis of rotation passes through the center of mass, and the element in the closed position in contact with the opposite ends of the housing, the housing provided with the imp is United in the form of a ledge limit switch shut-off element, located between the axis of rotation of the locking element and the diameter parallel to the axis of rotation.

This result is achieved by the fact that the limit switch is located inside the housing between its end and the center.

This result is achieved by the fact that the axis of rotation offset from the parallel diameter at 10-18% of its length.

This result is achieved in that the node rotation of the locking element is designed as two located on the locking element hemispherical protrusions included in the hemispherical recesses on the inner surface of the shell.

This result is achieved in that the axis of rotation of the locking element is in the plane of symmetry of the housing, perpendicular to its longitudinal axis.

This result is achieved in that on the outer surface of the body is covering its annular recess.

Execution of the stop disk element with a center of mass that is offset from its geometric center and install it in the housing in such a way that the axis of rotation of the element passes through its center of mass and is offset parallel to the diameter, and the element in the closed position in contact with the opposite ends of the housing minimizes the force required to open the valve, what is very important for this kind of devices.

The supply valve with stroke limiter valve element located between the axis of rotation of the locking element and the diameter parallel to the axis of rotation, allows for maximum opening of the valve and its return to the closed state.

The implementation of the limiter in the form of a projection is the most simple design and allows to make it in one piece with the housing. The protrusion may be placed on the end surface of the housing or shifted inside him. It was found that the best result is achieved if the limit switch is located inside the housing between its end and the center. It was also found that the best result is achieved if the axis of rotation of the locking element is displaced relative to the parallel diameter at 10-18% of the length of the diameter (or the corresponding axis of the ellipse, if the building will be made in the form of an elliptical cylinder, not circular).

Node rotation of the locking element may be chosen to be any of those known and used in various fields of technology, but the simplest seems to be doing it in the form of two located on the locking element hemispherical protrusions included in the hemispherical recesses on the inner surface is of resti corps.

The axis of rotation of the locking element may be located anywhere on the body between its ends, but the best would be, if it were to be in the plane of symmetry of the housing, perpendicular to its longitudinal axis. In this case, will be provided for the maximum overlap section of the valve in the closed position under the application of a minimum of effort.

Running on the external surface of the shell covering its annular recess creates an additional result facilitates reliable anchoring of the prosthesis in Vienna. Simply enter the valve prosthesis at the desired location within the vein and cut around the outside thread vein in the body of the prosthesis so that it is accommodated in this recess.

The essence of the proposed prosthetic venous valve is illustrated by implementing measures and drawing, which schematically shows a longitudinal incision is the most preferred option for implementation.

The prosthetic venous valve comprises a cylindrical housing 1 (circular or elliptical), made of a suitable material (for example, of titanium or of pyrocarbon or other). In the housing is installed with the possibility of rotation around the axis that is offset parallel to the diameter, the locking disk element 2. The locking element may also be made of any of the materials listed above. If e is ω locking element is made thus to its center of mass was offset from its geometric center. The locking element installed in the housing so that the axis of rotation is offset from the diameter, passes through its center of mass. Accordingly, the node rotation of the locking element, which is made in the form of two symmetrically located on the locking element hemispherical protrusions included in the hemispherical recesses on the inner surface of the housing (not shown, as known from the prior art) is made in such a way as to provide the desired axis of rotation relative to the housing. For example, as described in the claims, slip parallel to the diameter at 10-18% of its length. In the drawing the prosthesis shown in the closed position, the dotted lines show the “open”position. The case is supplied in the form of protrusion of the stopper 3 move the locking element located between the axis of rotation of the locking element and the diameter parallel to the axis of rotation. On the outer surface of the body is covering its annular recess 4.

The prosthesis is made known by means of casting, the use of machine tools (e.g. milling, grinding, etc.)

The prosthesis works as follows. Under the influence of pulse blood (direction is enhancing blood flow in the drawing is shown by an arrow) of the closing element 2 is rotated about its axis of rotation in the “open” position (in the drawing shown by the dotted line) until it stops at the stopper 3 is in progress and this position till the end of the pulse. After completion of the pulse shut-off element is returned to the closed position, as shown in the drawing.

1. The prosthetic venous valve containing a cylindrical housing and mounted therein can be rotated around an axis that is offset parallel to the diameter, the locking disk element, which is made with a center of mass that is offset from its geometric center, and installed so that the axis of rotation passes through the center of mass, and the element in the closed position in contact with the opposite ends of the housing, the housing is supplied in the form of protrusion of the restrictor valve element located between the axis of rotation of the locking element and the diameter parallel to the axis of rotation.

2. The prosthesis according to claim 1, characterized in that the limit switch is located inside the housing between its end and the center.

3. The prosthesis according to claim 1, characterized in that the axis of rotation offset from the parallel diameter at 10-18% of its length.

4. The prosthesis according to claim 1, characterized in that the node rotation of the locking element is designed as two located on the locking element hemispherical protrusions included in the hemispherical recesses on the inner surface of the shell.

5. The prosthesis according to claim 1, characterized in that the axis of rotation of supernovalatente is located in the plane of symmetry of the hull, perpendicular to its longitudinal axis.

6. The prosthesis according to claim 1, characterized in that on the outer surface of the body is covering its annular recess.



 

Same patents:

FIELD: medical engineering.

SUBSTANCE: device has ring-shaped body, fixing members 3 manufactured as protrusions and rotatable cusps mounted in the ring-shaped body. Slots are available on lateral surfaces of body fixing members mainly arranged along central axis of the device body. Protrusions are available on lateral surfaces of slots produced on lateral surfaces of cusp. The protrusions are engageable with slots in device body.

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FIELD: medical engineering.

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FIELD: medical engineering.

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FIELD: medical engineering.

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4 cl, 2 dwg

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FIELD: medical engineering.

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EFFECT: high operation reliability and reduced hemolysis.

4 cl, 2 dwg

FIELD: medical engineering.

SUBSTANCE: device has two leaflets. The leaflets are mounted on finger member allowing rotation about artery axle and have working ends and shank. The working ends have fitting surfaces restricted with thrusting and holding ribs. A holding rib has internal and external end surface. The external end surface of holding rib of each leaflet has protrusions having centering surfaces manufactured as portions of the same revolution surface having diameter of Dc. Revolution surface axis coincides with the central axis of the holder.

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3cl, 4 dwg

FIELD: medical engineering.

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FIELD: medical engineering.

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FIELD: medical engineering.

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1 dwg

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2 ex

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