(Diane Sawyer:) Who needs these exactly anymore, when you can put them in and work them through a Da Vinci robot. The surgeon you just met, Doctor Michael Stifelman, director of robotic surgery at NYU Langone Medical Center is here right now. Let me see if I understand this right, less blood loss this way, if you do it this way?

(Dr. Michael Stifelman:) “Yes.”

(Diane Sawyer:) If you do it through the navel, you're not cutting muscle because the muscle is what's so painful when you cut it.

(Dr. Michael Stifelman:) “Absolutely.”

(Diane Sawyer:) And you can be out of the hospital in the same day?

(Dr. Michael Stifelman:) “A day or two. Patient-driven.”

(Diane Sawyer:) And there are about 930 of these in hospitals around the country right now?

(Dr. Michael Stifelman:) “Yes, there are.”

(Diane Sawyer:) Now, you were saying that it actually has less tremor than the human hand does. So, these machines correct for any tremor that you might have in your own hands?

(Dr. Michael Stifelman:) “It's incredible. And that is absolutely true. The Da Vinci system is built in, so even the slightest tremor or a large tremor gets completely dampened.”

(Diane Sawyer:) And I didn't believe it when they told me you were going to peel a grape. But, we have you with this instrument peeling a grape, little bitty skin coming, look at that. Look at the fineness of that. Now, can you thread a needle, as well?

(Dr. Michael Stifelman:) “Absolutely.”

(Diane Sawyer:) Are you going to do it for me?

(Dr. Michael Stifelman:) “I'm going to do it for you. I'm going to have you do a couple of things too.”

(Diane Sawyer:) Okay, I'm getting right here, I'm sitting down, getting myself ready. You do not want to get your surgery by me today in the studio, let me tell you.

(Dr. Michael Stifelman:) “So, here, look at the vision. I can zoom in very closely.”

(Diane Sawyer:) Right.

(Dr. Michael Stifelman:) “I can grab this skin. And gently, I can peel this. Amazing, isn't it?”

(Diane Sawyer:) It's astonishing.

(Dr. Michael Stifelman:) “Now, imagine if you could take this technology and this vision and you can put it essentially anywhere in the body that you want to. Let me show you how we thread a needle.”

(Diane Sawyer:) Okay.

(Dr. Michael Stifelman:) “So, this is the fourth arm. I'm releasing the grape. So, again, it takes a two-arm surgeon. And now I have four arms to work with.”

(Diane Sawyer:) Right.

(Dr. Michael Stifelman:) “And I can control the camera. I control four different arms. I'm going to grab this needle right here and this thread. I'm going to then place it into the needle.”

(Diane Sawyer:) Oh, look at that.

(Dr. Michael Stifelman:) “And again, look at the visualization I have. Look how easy I can bring this up. And I must say, I'm a little nervous and I'm shaking right now. But you can't see a thing.”

(Diane Sawyer:) Okay, what is it...

(Dr. Michael Stifelman:) “I'm going to switch it over to you. What I want you to do, since we're running short of time, I want you to actually work this. So, I'm going to pass a couple instruments to you.”

(Diane Sawyer:) Oops, I squeezed.

(Dr. Michael Stifelman:) “So, now, just squeeze.”

(Diane Sawyer:) Yeah.

(Dr. Michael Stifelman:) “Perfect. And now, you can move. So, let's go grab this rubber band, right over here. There you go. You're doing great.”

(Diane Sawyer:) I got it.

(Dr. Michael Stifelman:) “Good. And you can put it anywhere. Put it right there.”

(Diane Sawyer:) All right.

(Dr. Michael Stifelman:) “And look with the two consoles, we can work together. So, you can have two surgeons working at the same time. So, imagine I'm trying to teach you, I can help you.”

(Diane Sawyer:) I love this.

(Dr. Michael Stifelman:) “Isn't this great?”

(Diane Sawyer:) It's really an extension of your own arms as if, if your own arms were a little more precise.

(Dr. Michael Stifelman:) “Were little tiny, exactly. And it really enhances the ability of the surgeon to do things.”