CN2055372U - Short-pillar type artificial cardiac valves - Google Patents

Abstract

The utility model discloses novel short-pillar type artificial cardiac valves. Valve frames for the cardiac valves are formed by integrally processing steel alloys; the short-pillar type artificial cardiac valves are provided with a valve pillar and two short valve pillars which comprise linear supporting points to support and hang valve pieces. The valve pieces present circular disk shapes; the edges of the concave surfaces of the valve pieces are provided with small flat rings which are used for the contact and the support of the short valve pillar. The convex surfaces of the valve pieces are provided with the concave disc pools of the circular disks which can be used for hanging and hooking the small valve pillar. The valve pieces make the opening and closing movement in the valve frame, and can not fall, and act the function of a check valve. The opening angles of the valve pieces can reach 70 DEG, and the closing angles of the valve pieces is 0.5 DEG-2 DEG; the number of the hole of the blood stream area of the valve pieces are reduced to three holes, which enlarges the cross section of the blood stream; the back-streaming volume is small; the fluency of the blood stream is improved; therefore, the transvalvular pressure gradient is reduced; the thromboembolism rate is reduced. The utility model has the advantages of high stability, and high reliability. The abuse of the fracture of the valve pillar is solved from the structure.

Description

Short-pillar type artificial cardiac valves

This utility model belongs to the artificial organ of biomedical engineering, is a kind of Cardiac valve prosthesis.

The cardiac valve of human body plays a part check valve body in heart, the flow of its control blood and the direction of blood flow.Valvular heart disease is a kind of commonly encountered diseases, the lighter's disablement, and weight person is with life-threatening.Serious case must be replaced the cardiac valve of pathological changes in patient's body with Cardiac valve prosthesis by operation, could save patient's life.Cardiac valve prosthesis is a kind of artificial organ, and it makes bioengineering stride forward a step again.

From the sixties in this century, the development and the application of Cardiac valve prosthesis have been carried out.Nearly tens of types Cardiac valve prosthesis comes out in decades, but a kind of ideal prosthetic heart valve is not arranged so far as yet.Several times eliminate, in clinical practice, have the artificial heart mechanical valve prosthesis of considerable influence to have so far: one, spherical artificial cardiac valve; Two, the dish-like Cardiac valve prosthesis of inclination; Three, full charcoal bifolium Cardiac valve prosthesis.Ball-type valve is a blood flow type on every side, and is bigger to the resistance of blood flow, the pressure gradient height, and the thromboembolism rate is higher.Seldom adopt at present.For the dish-like Cardiac valve prosthesis of inclination, its typical products is U.S. Bjork-Shiley(BS) lellihei-Kaster valve, in clinical practice first in 1969, done some improvement again in using later on, BS concave-convex type valve and BS single column valve have released one after another.BS single column valve is comparatively popular at present a kind of, be applied to clinical existing 35000 surplus example.The advantage of the dish-like artificial lobe of inclination is simple in structure, and function is better, and especially the single-column lobe after the improvement is opened 70 degree, is half center blood flow type, and is easy to use, cheap.So this kind lobe is used in the whole world about about 60%, shortcoming is the mechanical failure that easily forms thrombosis and occur the fracture of lobe post individually.The structure of full charcoal bifolium valve is a center blood flow type, but because of technology is comparatively complicated, costs an arm and a leg and some structural shortcomings, uses not general.

Most popular in the world at present BS single column valve is to come out nineteen eighty-two, is characterized in changing the bow type valvula post of original valve into single-column, increases fastness, has avoided the shortcoming of valvula post easy fracture.Open angle changes 70 degree into by 60 original degree, has reduced resistance of blood flow, has improved the flow field.But the big lobe post of this valve still is arc, does not change original profile, and the flow export of blood flow still has five, and two microstomes are wherein arranged, and blood flow will cause the blood flow flow field to disturb by microstome, easily form thrombosis.And the danger that can't avoid big lobe post to rupture.In addition, because big lobe post and valvula post support the centre of putting forth effort on limb simultaneously in keying, be easy to wearing and tearing.And limb has vacillates now to the left, now to the right and the phenomenon of play up and down, and energy consumption is bigger in opening-closing process, and backflowing of blood flow is also corresponding bigger.

The purpose of this utility model is to provide a kind of improved short column type dish-like Cardiac valve prosthesis that inclines.Overcome the big lobe rod structure shortcoming of single column Cardiac valve prosthesis, improve the flow field of its blood flow and the function that limb opens and closes, strengthen the intensity of lobe frame and limb, increase the service life.

For setting forth conveniently, earlier this utility model accompanying drawing is made simple explanation.

Fig. 1 is the schematic perspective view of this utility model short column type Cardiac valve prosthesis opening.Shown in the figure: seam ring 1, lobe frame 2, lobe frame valvula post 3, two short lobe posts 4 of lobe frame and limbs 5.

Fig. 2 is in the generalized section of opening for this utility model short column type Cardiac valve prosthesis.There is shown the opening of seam ring 1, lobe frame 2, valvula post 3, short lobe post 4 and limb 5.

Fig. 3 is the vertical view of the lobe frame of this utility model short column type Cardiac valve prosthesis.In the middle of among the figure is valvula post 3, and both sides are two short lobe posts 4, and obviously visible its colludes the contact site that hangs and support limb and be a linearity.

Fig. 4 is the cutaway view of the limb of this utility model short column type Cardiac valve prosthesis.Limb is by being the dish that concavo-convex garden sphere is formed.The periphery of visible spill sphere has a facet ring 7 among the figure, to contact with the short lobe post 4 of lobe frame; In convex spherical central authorities plate-like spill video disc pond, one garden 6 is arranged, collude to hang for the short lobe post 3 of valvula frame and use.

The purpose of this utility model reaches like this, a kind of improved Cardiac valve prosthesis that designed short column type Cardiac valve prosthesis is made up of seam ring 1, lobe frame 2, limb 5.It is characterized in that said lobe frame 2 adopts high strength elastic steel alloy integral body to process.The shape of lobe frame is a garden shape, a valvula post 3 that stretches to the center is arranged on the framework, being positioned at the valvula post is that two ends of the string of sagitta have two short lobe posts 4 that stretch out vertical with the valvula post, the valvula post can collude the video disc pond 6 that is hung on limb 5, two short lobe posts 4 can be supported in facet ring 7 positions of the dish face periphery of limb 5, are a straight line fulcrum and support video disc.Can make limb 5 in opening-closing process, can from lobe frame 2, not come off out.The length of two short lobe posts 4 is controlled between the 4-6 millimeter and is streamlined, so that both guaranteed its intensity, reduce in the not obvious again blood flow cross section that makes.

Limb 5 of the present utility model is by being the dish that concavo-convex garden sphere is formed.Spill sphere periphery has the facet ring 7 of a 1-2 mm wide, and this has plate-like spill video disc pond, a garden 6 for the support zone of 4 pairs of limbs of short lobe post at protruding sphere, and it is the hang part position of valvula post 3.The material of limb 5 is isotropic graphite matrixes, is coated with the isotropic pyrolytic carbon of 0.35 millimeters thick outward, forms through machining.

Seam ring 1 usefulness terylene filament fabric manual suture ligation of the present utility model, and form through setting treatment.

This utility model valve can only unidirectionally be opened, and limb 5 is 70 degree with the maximum angle of lobe frame 2 during unlatching, and valve is closed, and limb 5 is the 0.5-2 degree with the angle of lobe frame 2 when closing.

This utility model short column type Cardiac valve prosthesis has 5 kinds of models that vary in size, and its lobe mouth internal diameter is respectively: 16 millimeters, 18 millimeters, 20 millimeters, 22 millimeters and 24 millimeters.The seam ring width is controlled at the 4-6 millimeter.

The utlity model has following advantage and good effect:

One, compare with BS single-column valve, BS single-column valve is an arc big lobe post in order to what support limb, is supporting the centre of limb.And this utility model supports the periphery facet ring portion position of limbs with two short lobe posts, and with control limb unlikely coming off in opening and closing motion, limb has opened and closed the effect of one-way cock.Such improvement makes when valve is opened, and the zone of blood flow institute flow path reduces to three holes by five holes, has increased the cross-sectional area in flow field, has reduced the eddy current that blood flow forms, thereby can reduce the formation of thrombosis, has also reduced pressure gradient simultaneously.The stress point of lobe post is shifted to the edge of framework by the center, has reduced the moment of flexure of lobe post root, has improved the load intensity of lobe post.Because three fulcrums of valvula post 3 and two short lobe post 4 support limbs are a straight line, limb 5 is tended to be steady in opening-closing process simultaneously, keying speed improves greatly, has reduced energy consumption.So this utility model good stability, the reliability height, obviously improve in the blood flow flow field, and function has improvement greatly.

Two, short column type lobe of the present utility model sets up meter rationally, adopts the retrofit of whole little surplus micro-cutting to form, and bulk strength improves greatly, has high fatigue resistance, has fundamentally solved the drawback of lobe post fatigue fracture, and easily manufactured.

Three, limb of the present utility model adopts the isotropic graphite matrix, is coated with isotropic pyrolytic carbon outward and makes, and is excellent material of manufacture of intraocular cardiac valve and technology in the world at present.

Four, this utility model valve is in opening-closing process, and lobe frame and limb contact surface increase, and the pressure gradient of valve is little, and energy consumption reduces, and noise is little, and limb does not have the phenomenon of waving in opening-closing process, and regurgitation volume is little.

Five, the cross section through the blood flow of valve increases, and the hole count in the zone of flowing through reduces, and the eddy current of blood flow reduces, thereby reduces the thromboembolism rate.

Six, this utility model has increased the facet ring of 1-2 millimeter width at the sphere edge, recessed garden of limb, and the contact surface that has increased limb and lobe frame in opening-closing process is not and easy to wear, and the life-span of valve has obtained prolongation.

Claims (2)

1, a kind of Cardiac valve prosthesis of being made up of seam ring 1, lobe frame 2, limb 5 is characterized in that:

A) said lobe frame 2 adopts high strength elastic steel alloy integral body to process, the shape of lobe frame is on the framework of garden shape a valvula post 3 that stretches to the center to be arranged, being positioned at the valvula post is that two ends of the string of sagitta have two short lobe posts 4 that stretch out vertical with the valvula post, valvula post 3 can collude the video disc pond 6 that is hung on limb 5, two short lobe posts 4 can be supported in the position of the dish face periphery facet ring 7 of limb 5, three fulcrums are a straight line, make limb 5 do to open and close motion therein and unlikely coming off.

B) said limb 5 is by being the dish that concavo-convex garden sphere is formed, and spill sphere periphery has the facet ring 7 of one 1 to 2 mm wide, and this is the support zone of 4 pairs of limbs of short lobe post.At protruding sphere the recessed video disc of garden plate-like pond 6 is arranged, valvula post 3 just colludes and is hung on this.The material of limb 5 is isotropic graphite matrixes, is coated with isotropic pyrolytic carbon outward and forms through machining;

C) seam encircles 1 usefulness terylene filament yarn fabric manual suture's ligation and forms through setting treatment.

2, Cardiac valve prosthesis according to claim 1, limb 5 is 70 degree with the maximum angle of lobe frame 2 when it is characterized in that the valve unlatching, its angle is the 0.5-2 degree when closing.

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