until the moment of puncture?
I used this mechanism.
When the tip of the device
is pressed against tissue,
the mechanism expands outwards
and wedges in place against the wall.
And the friction that's generated
locks it in place and prevents
the spring from retracting the tip.
But right at the moment of puncture,
the tissue can't push back
on the tip anymore.
So the mechanism unlocks
and the spring retracts the tip.
Let me show you that
happening in slow motion.
This is about 2,000 frames a second,
and I'd like you to notice the tip
that's right there on the bottom,
about to puncture through tissue.
And you'll see that
right at the moment of puncture,
right there, the mechanism unlocks
and retracts that tip back.
I want to show it to you again, a little closer up.
You're going to see the sharp bladed tip,
and right when it punctures
that rubber membrane
it's going to disappear
into this white blunt sheath.
Right there.
That happens within four 100ths
of a second after puncture.