This could get confusing, so if you have any questions, just ask.
The farrell bag is a bag with a special valve at the top that lets gas out but not liquid.
Hanging on Linden's back pack.
Here is a picture of the
gas relief valve thing. That is what the farrell valve is.
Please disregard the stomach goo, sorry about that.
It has two clamps. You can open both and have flow both ways. Or you cna clamp the one to the bag and nothing can go into or out of the farrell bag, but the feed can still go through the Y port connector. If you clamp it from the stomach to the y-port, nothing can go in or out and it's totally clamped off. If you want to take a feed out of the port, clamp both so nothing leaks while not attached.
Here is a
close up of the y-port.
There are a few different ways you can hook it up if you have a GJ tube, but only one way to hook it up for a G-tube. For a G-tube you'd just hook the orange adaptor end into the extension and then put the feed through the y-port on the farrell bag.
For GJ tube, you can either hook the feed up to the y-port for a
g feed and decompression at the same time. or you can hook the feed up to the J port on the actual feeding tube and connect the farrell bag into the other port (the G port) on the feeding tube.
This way you can do a J feed and decompress the stomach at the same time.
If the bag is below the stomach (like on the floor) the stomach will drain and nothing will go back in.
If the bag is at the same level as the stomach the extra volume that the stomach doesn't handle easily will go out but will very slowly go back in but the gas will go out the farrell valve.
If the bag is hung on an IV pole, the gas and some very pressurized stomach contents will go into the back but will fairly quickly drain back in if the stomach can handle it. The gas will go out the farrell valve and not back in.
So if you wanted to make sure the stomach was always empty you would feed through the J port and hook the farrell bag up to the g port. You'd then make sure the bag was on the floor well below the stomach. Nothing would go back into the stomach.
If you you just want to vent during a feed but it is tolerated fairly well, you'd hang the bag on the IV pole and what was tolerated would go back in fairly fast but all the gas would come out.
If you want to make sure that anything that is slightly over pressurized comes out, you hang the bag a little over the stomach height. The feed can take forever to go back in, but you won't have reflux since it "refluxes" into the bag instead of out the mouth.
We put Linden's stomach to drain at night (so farrell bag on the floor). During the day I don't hook him up till he starts refluxing or having pain. I adjust the height of the bag on the IV pole (lower goes slower) based on how well he's doing. If he has a lot of pain like today, we hook the farrell bag to the outside of his back pack or onto a baby doll stroller that he uses to push his feed around. Once he is more comfortable, I give him a while and then start slowly raising the height of the bag. If he starts having more pain or reflux, I lower the bag a bit till he's okay.
It's pretty neat to see how much or how little comes out. Sometimes a whole feed will come out and just stay there for a while then suddenly it'll start going back in really fast. I have no idea why he does this. Other times just a bit comes into the bag and stays at about that level for the whole feed. His motility seems to vary quite a lot.
If you have any other questions or want any other pictures, just let me know. I really like the farrell bag because it can be used so many different ways based on how he's doing at that exact moment.