JPS60116364A - Artificial valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an artificial valve and the materials constituting it.

In addition to having good blood compatibility, the conditions required for an artificial valve include the ability to open and close in a short time, a large flow path area when fully open, and a valve plate that does not come in contact with the blood vessel wall or other surfaces. It has become an important location.

Therefore, the shape of the valve may be oval in addition to circular, and the valve plate constituting the valve may be divided into two to four pieces instead of one. Further, it is necessary to devise ways to improve blood flow in the valve plate supporting portion where blood tends to stagnate and therefore there is a high risk of thrombus formation, thereby improving antithrombotic properties.

The present invention has been developed in view of the above circumstances, uses a material with good blood compatibility, and has a relatively simple valve plate support mechanism.

The present invention will be explained below based on the drawings.

FIG. 1 is a partially cutaway plan view of the first embodiment, and FIGS. 2 and 3 are side views of essential parts showing the structure of the hemispherical protrusion and guide groove.

This is the case where there is only one valve plate 1 and the housing is circular.

The valve plate 1 is supported in a guide groove 5.5' formed in the housing 4 by hemispherical projections 2.3.2', 3'.

FIG. 2 shows a side view of the valve when it is closed, and FIG. It is possible to move within the groove 5, maintain the appropriate position and angle of the valve plate 1 relative to the opening degree of the valve, and adjust the protrusion amount of the one-sided groove (lower piece) of the valve plate 1 to an appropriate value when fully opened. and a hemispherical protrusion 2.
3 has a function of eliminating blood stagnant inside the guide groove 5 and preventing thrombus formation.

By appropriately selecting the shape of the guide groove as shown in FIG. 4, for example, it is possible to arbitrarily define the movement position of the valve plate.

Figure 4 (a) shows one with a single guide groove in a dogleg shape, (b) shows one in which the position of the rotation axis of the valve plate does not change, and (C) shows one in which the angle of opening and closing of the valve changes. Among the smaller ones, (d) is one in which the valve plate moves significantly with the valve opening degree.

The above is for the case where there is one valve plate and the flow path is circular in shape.
Even when the shape of the flow path is oval, the configuration, mechanism, and function are the same.

Next, as a second embodiment of the present invention, a valve plate having four valve plates will be described.

FIG. 5 is a partially cutaway plan view, and FIGS. 6 and 7 are side views of essential parts showing the structure of the hemispherical protrusion and guide groove.

A hemispherical protrusion 2 in which four valve plates 1 protrude to the left and right, respectively.
．． 3.2', 3'' are supported by guide grooves 5.6.5', 6' formed in the housing 4. Figure 6 shows the valve closed, Figure 7 shows the valve open This is where I am.

The movement of the four valve plates 1 is controlled by hemispherical protrusions 2, 3, 2', 3'
& Guide groove 5. Defined by the shape of 6.5″, 6′,
By suitably selecting the shape of the guide groove, the required movement of the valve plate is achieved.

Other mechanisms, functions, etc. are the same as in the first embodiment.

Furthermore, even when the number of valve plates is two or three, and even when the shape of the flow path is oval, the configuration, mechanism, and function are the same as those of the second embodiment, so a description thereof will be omitted. do.

As mentioned above, the material constituting the valve described above is required to have excellent blood compatibility, but the valve plate and housing of the artificial valve of the present invention are made of single crystal alumina ceramic (
Artificial sapphire), polycrystalline alumina ceramic, silicon carbide ceramic, silicon nitride ceramic, titanium nitride, or other ceramic material, or made of metal such as stainless steel or titanium, and the above-mentioned ceramic, etc. is deposited on the surface. An artificial valve with excellent blood compatibility can be produced by coating with the above method or other methods.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of a first embodiment of the present invention;
2 and 3 are side views showing the main parts, FIG. 4 is an explanatory diagram of the guide groove provided in the housing, and FIG. 5 is a partially cutaway plan view of the second embodiment. 6 and 7 are side views showing the main parts thereof. 1 - valve plate, 2.3.2', 3° - hemispherical projection, 4 - housing, 5.6.5', 6' - guide groove. Patent Applicant: Senko Medical Industry Co., Ltd. Representative Director Yukio Aoki Figure 1 Figure 2 Figure 3 Figure 1 I Figure 4 ゛Figure 5 ■ Figure 6 Figure 7

Claims (5)

[Claims] (1) An artificial valve characterized in that one to four valve plates each having two hemispherical protrusions on the left and right sides are supported by the protrusions inside a circular or oval housing. (2) Claim 1 characterized in that two hemispherical protrusions on each of the left and right sides of the valve plate of the artificial valve slide and move within the guide groove of the housing as the valve opens. artificial valve. (3) When the two hemispherical projections on the left and right sides of the valve plate of the artificial valve slide and move within the guide groove of the housing, the position of the rotation axis of the valve plate moves with the opening degree of the valve. The artificial valve according to claims 1 and 2, characterized in that the amount of unilateral angular protrusion of the valve plate when the valve is fully opened is reduced. (4) The valve plate of the artificial valve is 50 mm relative to the horizontal plane when closed.
degree to 65 degrees, 60 degrees to 90 degrees relative to the horizontal plane when open
Claims 1 and 2 are characterized in that:
and the artificial valve described in paragraph 3. (5) The valve plate and housing of the artificial valve are made of single-crystal alumina ceramic, polycrystalline alumina ceramic, titanium nitride, or other ceramic materials, or made of stainless steel or metal such as titanium. The artificial valve according to claims 1, 2, 3, and 4, characterized in that the surface KII of the ceramic or the like is deposited by vapor deposition or other method. .