GB2281371A

GB2281371A - A prosthetic trileaflet heart valve

Info

Publication number: GB2281371A
Application number: GB9317783A
Authority: GB
Inventors: Nasser Rasmi Hassan Rasmi
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-08-26
Filing date: 1993-08-26
Publication date: 1995-03-01
Also published as: GB9317783D0

Abstract

A prosthetic heart valve has three leaflets (7) pivoted on internal projections (3) of triangular or flattened triangular form on a metal ring (1). The pivots are received in recesses (2) in the projections, the recesses being formed as circles lacking a 95 DEG segment so as to limit the pivotal angle. The metal ring (1) is formed with a lip (7) and the cooperating edges of the leaflets and projections are bevelled (4). <IMAGE>

Description

" PANEL 'A' " THE PROTHETIC TRILEAFLET HEART VALVE." ** This invention relates to a prothetic heart valve that is used in human heart valve replacement operations.

** Since the first insertion of a prothetic heart valve in the aortic site was done by Albert Starr, in 1961, many valves were designed. The most commonly used nowaday are the ball-caged, the disc, and the bileaflet valves in addition tothe bioprothetic valves.

All the prothetic heart valves used had a major complication which is a thrombogenicity which vary between the different types and models. It is well known that the turbulance of the blood stream and the breakdown of the red cells that result in such complication. Whichever the design and the material are,the main design needed is to have a central flow to allow for a none turbulant flow.

** According to the present invention the prothetic heart valve presented is a trileaflet valve, this is to allow for a central flow of blood and in consequence it decreases the turbulance of the blood and the break down of its cells.

These leaflets are supported by three projections which hold them through a groove containing the pivots of the leaflets.

Fig:l; shows the valve consisting of '4' parts,the metal ring'l' incorpo (run) rating in it the three projections'3',the dacronlsewing ring'2',and the three leaflets'7'.

Fig:2 & -3 ; show the design for the projecting part of the metal ring,in Fig:2 the projection is triangular in shape with three sides and a thickness of the metal ring, and contain the groove for the leaflet pivot. One side is in fact the peremeter of the metal ring,and two sides with an angle of 90'. Fig:3 ;shows that the projection is in the form of a triangle without its apex and a slanting side to incorporate in the system of closure of the valve.

Fig:5 & 6 ; show the corresponding leaflet to the different projection in Fig:2 & 3.

PANEL 'A' The groove that hold the pivot of the leaflets is shown in Fig:7, this groove is designed to hold and prevent the leaflet from being more than 85'in the opening position, which allow for a 5' to accumulation of the stream in, and start the closure fase, while in the closure position it is horizontal or nearly horizontal as that the main point is to the coaptation of the leaflet in the closure position.

The inside edge of the metal ring is in fact a ridge to hold the leaflet in closure as in Fig:2,3 & 4, this ridge is also a slanting edge as in fig:9.

Fig:5 & 6 ;show the different shape of the leaflet ;in fig:5,the leaflet in coapting with the fig:2, and it formed of 5 sides , one paralell to the metal ring ,two are paralell to the sides of the triangular projection and it carry the pivot which is in the form of pivoting shelf to be embeded in the groove of the triangular projection ,and the last to sides are a meeting sides to form the summit of the leaflet at a 120' angle.

In fig:6, there are two additional sides to replace the lost part or apex of the triangular projection, these sides are slanting in the reverse way of the inside slanting edge of the metal ring, as to distribute the power of closure position and to act as a counter action decreasing the pressure on the pivot in groove.

Also, the leaflet are cup-like to allow for accumulation of the stream and help the closure initiation mechanism.

THE CLOSURE AND OPENING POSITIONS : The opening mechanism is initiated by the rising of pressure gradient across the valve, so, in the position of opening the valve is prevented from being in an angle more than 85', and supported by the groove and the hinged pivot.

The closure mechanism is initiated by the drop of pressure and the reverse of stream and the power is distributed throughout the edges and sides of the leaflets; the meeting sides of the leaflets together, the meeting sides with projections and the pivot and the inside edge of the metal ring.

PANEL 'B' FIG: 1 ; the valve in closing position with a triangular projections.

1- metal ring.

2- tissue sewing ring.

3- the tringular projection.

4- the rounded side of the projection.

5- two side of the triangular projection with an angle of 90'.

6- the summit of the projection which is in 90' 7- the three leaflets.

FIG:1 ; the valve in closing position without the apical part of the projections.

1- cut section in the valve to be FIG:4.

2- the leaflet according to the projection.

3- the projection.

FIG:2 ; cut section of the valve with triangular projection.

1- the metal ring.

2- the inside ridge.

3- the groove for pivot.

4- the sewing ring.

5- the triangular projection with three sides and summit.

FIG:3 ; cut section of the valve with the modified projection.

1- the metal ring.

2- the inside ridge.

3- the groove 4- the slanting edge of the projection for the closure position.

FIG:4 ; cut section of fig 10.

1- the metal ring at the projection.

2- the groove.

3- the slanting edge of the projection.

4- the slanting edge of the leaflet.

5- the main metal ring.

6- the leaflet.

7- the edge of the metal ring.

FIG:5 ; the leaflet of the valve.

1- the side paralell to the metal ring.

2 & 3- the side paralell to the sides of the projection.

4 & 5- the meeting sides with an angle of 120'.

6- the pilfi t shelf.

PANEL 'B"' FIG:6 ; the leaflet with the modified projection.

1- the side paralell to the metal ring.

2 & 3- the sides paralell to the sides of the projection.

4 & 5- the meeting sides of the leaflets at an angle of 120'.

6 & 7- the sides coapting with slanting side of the projection and for the closure.

8- the pivot shelf.

FIG:7 ; the groove in the projection.

1- the circumference.

2- the pivot in the opening position.

3- the pivot in the closing position.

4- the angle of limiting part of the groove.

FIG:8 ; the valve in the opening position.

FIG:9 ; cut section of the valve with slanting inside edge of the metal ring.

1- the metal ring with its slanting edge for the closing mechanism.

2- the metal ring.

3- the sewing ring.

4- the edge of the leaflet in the slanting shape.

Claims

"PANEL 'C'"

*CLAIMS* CLAIM 1: the invented prothetic heart valve is a trileaf let valve with three leaflets as in fig 5 or 6 or any valve having more than two leaflets as a mean for opening and closing.

CLAIM 2: the invented prothetic heart valve as in claim 1 where the leaflets movement are through a joint in the projecting part of the metallic ring.

CLAIM 3: the invented prothetic heart valve as in claim 1 & 2 where the joint which is a noncomplete circle by a 95', and the pivot shelf of the leaflets are embeded in the groove.

CLAIM 4: the invented prothetic heart valve as in claim 1 to 3 where the principle claim is in the idea that the leaflets movement are through the pivot shelf of the leaflets in the joints present in the projecting parts of the metallic ring, the projecting part of the metal ring may be with a slanting edge and the inside slanting edge of the metal ring together with the apposition of the meeting sides of the leaflets are all the mechanism of closure position support of the valve.

CLAIM 5: the invented valve as claimed in any preceding claim, where in the cup-like leaflets, which there movement is carried by pivots in an inside projection that contain the pivot holding groove.

CLAIM 6: the invented valve as claimed in any preceding claim, where is the summit of closure of the leaflets is in the center of the valve.

CLAIM 7: the invented trileaflet prothetic heart valve substantially as described herein with reference to figures 1 to 10 of the accompanying drawings.