[HSF] ATS valve

[Nasser F. Abou'Seada]

Dear Bob ...
that is grave !!! .... is that effect along the edge of the leaflet related
to the degree of opening of the leaflets ?? ....... does the design of the
hinge complex affect the degree of opening of the leaflet ??? .....  I mean
.. would such effects be different on a leaflet that open to 80 degrees vs a
leaflet thet open to 70 degrees ??? ...... and how would that degree of
opening, as a function / affected by heart rate ... or rate of opening of
leaflets in a minute, be affected by the design of the hinge complex ???
...... ....

Thank you for your very informative scientific comments

NFA


On 6/19/07, Rwmfglycar at aol.com <Rwmfglycar at aol.com> wrote:
>
>
> Yes there will be effects from a projection into the flow
> path.  Acceleration
> of flow followed by vortices and slowing of flow is what
> produces  effects:
> acceleration of flow over a projection may damage red cells or activate
> platelets. The slowing of flow gives time for actvated platelets to
> form  aggregates
> with fibrin. This phenomenon can take place at the edge of the  housing or
> along the edge of a leaflet as well as at the hinge area..  Note the fact
> that
> there is  hemolysis (at a low level) in all  pyrolytic carbon valves. I
> will
> eventually get some comparative data  together
> Bob
> In a message dated 6/19/2007 5:44:04 P.M. Eastern Daylight Time,
> nfaabouseada at gmail.com writes:
>
> would  not that interfere with sI will eventually get tream flow ? ....
> how
> about  resultant
> turbulence due to projections in the flow stream ? ... any  significance?
> any
> effects?
>
> NFA
>
>
> On 6/19/07,  Rwmfglycar at aol.com <Rwmfglycar at aol.com> wrote:
> >
> > Open  pivot design.
> > Most bileaflet valves have have rounded hinges on the  leaflets
> which  fit
> > into a recess. The ATS has projections from  the rounded inner wall of
> the
> > housing which engage with the  leaflet.
> > Bob
> >
> >
> >
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> --
> Nasser  F.  Abou'Seada,
> MB,ChB,MD,FRCSEd,ChM,ChD  C/Th,
> FICS,FISCVS,FSSRCTS,FHMS,MESC
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-- 
Nasser  F.  Abou'Seada,
MB,ChB,MD,FRCSEd,ChM,ChD C/Th,
FICS,FISCVS,FSSRCTS,FHMS,MESC