Showing posts with label Duncan Graham-Rowe. Show all posts
Showing posts with label Duncan Graham-Rowe. Show all posts

Thursday, May 03, 2007

Turn Up The Happy Gas

Here's another slightly strange, but cool, medical breakthrough for you. This time around, our breakthrough involves upgrading techniques for abdominal surgery. Most of us are probably aware of how some surgeries have changed in recent years. Procedures that used to involve cutting a patient's abdominal wall clean open, to gain access to those reclusive internal organs, have been improved with the advent of laparoscopic surgery, where abdominal incisions are tiny, scars are miniscule and recovery time is much shorter than with traditional surgical methods. Such surgeries involve a laparoscope, a tiny camera inserted to examine the abdominal cavity so doctors can see what's going on and repair or remove damaged organs, via other tiny little incisions and long, flexible instruments. Such "keyhole" surgery has made necessary operations much easier for many a grateful patient. There's a new kind of surgery coming to operating rooms around the world, however, that eliminates the external incisions completely, leaves no visible scars, has minimal recovery time and doesn't even require general anesthetic.

Duncan Graham-Rowe, at NewScientist.com, says this revolutionary new technique is called transgastric surgery, or natural orifice translumenal endosurgery--NOTES for short. NOTES takes a whole new approach to the problem of getting inside a patient, quite literally. Instead of entering the abdomen through surgical incisions made externally in the skin and muscle walls, the cameras and surgical tools find their way into the abdominal cavity via the patient's mouth. An incision is made in the stomach from the inside; the surgical instruments pass into the abdomen through this opening, and tissue that needs to come out does so via exactly the same route that food goes in--in reverse, of course:

To some it may sound disgusting, to others the prospect of scar-free surgery may sound too good to be true. Either way it's coming. In the past couple of weeks three separate surgical teams say they have carried out NOTES procedures on humans - surgical firsts for both Europe and the US. And doctors in India say they have performed appendectomies through the mouth.

This transgastric procedure offers a lot of advantages to conventional, or even keyhole surgery: less pain (the stomach apparently has fewer nerve endings than the skin), less sedation (which Duncan-Rowe points out is good for the elderly and infirm), less risk of infection (theoretically), due to avoiding the bad bugs that live on the skin, as well as the disinfecting power of stomach acid, and--an important gain for the workaholics of the world--by far less recovery time:

"Even with keyhole surgery, patients stay off work for several days," says Lee Swanstrom, director of the Oregon Clinic in Portland, US, which specialises in gastrointestinal and keyhole surgery. "With NOTES they could go back to work the same day."

Good grief, that's fast. Gives a whole new meaning to "same day service." Now this last "advantage" might be a mixed blessing for some people who, for example, were hoping that their gall bladder surgery would help them avoid the big cubicle shuffle at the office, or going to the boss' daughter's ballet recital. Be that as it may, most of us would see a rapid spring back to full strength as a big plus. A few years ago, a friend and I had the same surgery performed, only mine was laparoscopic and hers was a full stomach incision. Her surgery came first, and I watched her long and painful recovery with a great deal of sympathy, because it was really hard. She suffered a lot. When it came time for my surgery, I was dreading a similarly unpleasant experience, but all that dread was wasted. While I still had a fairly long recovery time, mostly due to the five-and-a-half hours of general anesthesia the surgery entailed, there was very little pain, because of the tiny, tiny, unbelievably small incisions my doctor used to get at my innards. I'd take my surgery over my friend's hands down; if you added the less intense anesthesia, so the recovery could proceed even faster, that would just be all that much better.

Needless to say, the downside is the "ick" factor. Who really wants to have their appendix come out of their mouth? While they're somewhat awake, no less? I might request that the docs turn on the happy gas for that part of the procedure, although, now that I think about it, even that might not be necessary. When I had my surgery they put something in my IV to make me forget everything that happened from the time they wheeled me out of the waiting room till when I woke up in recovery. If you can't remember the icky bits, there's not really a need for the happy gas, is there? It was actually very frustrating to me that they stripped me of memories that I wanted. I find all this medical stuff fascinating, and probably would have watched the whole surgery, if that had been an option. To have a complete blank in my memory, when I had a prime opportunity for first-hand knowledge of what goes on behind the scenes in Surgery World is very frustrating. They didn't even film it for me, so that I could watch it after the fact!! To give the doctor credit, though, she did take some lovely photos of my insides, which I perused with great interest once the drugs wore off. That was of some comfort to me, even if I'd rather have the memories. I have to confess, though, I don't think even I would want to remember having my spleen come out my mouth. Turn up the happy gas, please (but shoot some video in case I change my mind.)

Saturday, August 26, 2006

Next Step: The Holodeck

The world is getting more complex all the time, and an ever-increasing list of technologies can fool us into thinking something is a tangible, physical object, that doesn't actually exist, or make us believe something occurred that never happened, or cause us to experience something that seems so real, but turns out to be total illusion. 3D holographic images like the ones in the Haunted Mansion at Disneyland, can make us think something is right in front of our faces that is nothing more than clever video projection. Other amusement park rides can have us screaming in terror as we fly down the mouth of a giant dinosaur, or find ourselves in the middle of a battle with a Death Star; and, of course, we all know from recent journalistic experience that photographs can be altered to convince us that something occurred which actually didn't. However, the thing that all these illusions have in common is that they are primarily visual in nature. Some amusement park rides combine visual illusion with motion to make us believe we are flying and swooping at great speeds over treacherous terrain, but our brains wouldn't really buy it, if our eyes weren't seeing it. Seeing is believing, as far as our bodies are concerned.

So, would you believe that it's possible for the genius computer nerds to come up with ways to make your body and brain feel sensations that have you completely convinced you are physically touching shapes and textures that are nothing but computer generated fakes?--not something you see that convinces you it's real, but something you feel with your skin, and would even if your eyes were closed--like making your hand experience the sensation that it is petting a porcupine, or stroking sandpaper, when really it's stroking a smooth surface? Okay, from what I read today, they are doing this kind of thing. Maybe not at such a level that you'd believe you were petting a porcupine, but enough to make you feel like you were touching something sharp or pointy, when it was really all in your mind.

I don't get this at all. I think it's totally cool, but I really don't understand how it works. What I've been reading about are new developments in haptics, which, according to Encarta online dictionary is: "the science of applying tactile sensation to computer applications in order to enable users to receive feedback in the form of felt sensations. Haptics technology is used to train hand-eye coordination in tasks such as keyhole surgery and spaceship maneuvers." MIT's Technology Review has an article by Duncan Graham-Rowe, in which he looks at advances in the field of making computer's fool your brain into believing that your hand is feeling something other than it is. Graham-Rowe looks at research where they're using mechanical devices to simulate different surfaces, not by changing the shape of the device, but by varying the force the device applies to the hand that's touching it:

To create this illusion of sharpness, Robles-De-La-Torre, working with Carlo Alberto Avizzano and colleagues at the Scuola Superiore Sant'Anna in Pisa, Italy, used a haptic interface called GRAB, which consists of a thimble connected to the end of a motorized, extendable arm. A user is able to move the thimble freely when placing their forefinger in it. Then carefully controlled motors provide force feedback, so the thimble's movement is impeded in ways that create "virtual" surfaces.

By setting up the system so subjects can move only their finger along one axis, from left to right, the researchers were able make people feel like they were running a finger over a range of different sharp and pointed edges, just by applying lateral resistance to their movement. The sensation was so convincing that the subjects were even able to match the shapes of the edges to images of them, such as a saw tooth or a hump with a pointed peak.

I'm really not entirely comprehending this, but it sounds like we're one step closer to the holodeck from Star Trek: The Next Generation. If they can get our minds to believe illusions we feel as well as illusions we see, how far off can we be from the ability to completely immerse ourselves in totally illusory worlds? I'm not sure how I feel about all this. I mean, a vacation toy is one thing, but what are the more nefarious uses to which such technology could be put? Virtual torture chambers? Virtual coersion tool, say convincing a head of state that his family is being killed before his eyes, in order to make him agree to your terms? Of course, there are much more benificent uses of such technology. If the technology gets advanced enough, the physically impaired could know what it's like to experience things the rest of us take for granted. How about a walk on the beach for a paraplegic, or maybe skydiving? Of course, right now we're still looking at feeling sharp and pointy edges, not complete environmental transformation. I do wonder what's next, though. Don't you?

Hat tip: Futurismic