What tool or technique do I need to fix this air hose fitting?

[Shiftless]

This is a supply line for a $2000 medical device that provides rhythmic compression waves to a patient’s legs by cycling air pressure into compartments of a system that wraps around the patient’s legs. It mitigates the problems associated with veinous insufficiency.

The air pressure is unknown but I’d guess it isn’t much.

It looks like the crimp attachment failed. It looks like there is a broken piece inside the rubber tube. This photo is all I have to go on.

Does anybody have a bright idea on how to fix this?

 

[paulsomlo]

I think the piece inside the tube may be a stiffening sleeve to strengthen the crimp.

 

[merkyworks]

Based on the grooves on the black fitting and the grooves on the green air line, the two are connected by a straight double sided barb fitting, like this.



Not sure on the barb size but since its medical I'm guessing it will be metric. Also since this is just supplying air to a prosthetic type device you shouldnt need to bother looking for "medical grade" replacement fitting.

 

[1982fxr]

I have the $100 version of that thing. Gives a great massage. Shocking how tight it gets if tighten the velcro too much.

 

[whitesco]

I don’t know if that’s for home/personal use or in a healthcare facility but I’d be nervous about even obviously good/adequate fixes due to potential liability.

If I wasn’t concerned the post above nailed it - any of several types of hose barbs would probably do, especially if it’s not high pressures.

 

[Shiftless]

I don’t know if that’s for home/personal use or in a healthcare facility

Home use.
If I was running a medical facility, I wouldn’t even consider a DIY repair.

 

[seber]

You might try epoxy but realistically, I think a new unit is in your future.

 

[Wamsutta]

The piece inside the tube is probably there to prevent the tube from collapsing under the pressure of being crimped.

What you're going to need is that special crimper they used to make the crimp and a new piece for the tube.

 

[wantedabiggergarage]

Home use.
If I was running a medical facility, I wouldn’t even consider a DIY repair.

In the hospital, they keep extra hoses for those. They put them on my legs the last two times I went in, because I was so weak when I went in, they were worried about several things from bed sores to lack of oxygen in my blood to extremeness.
Might see if you can get a package label.

 

[KnurledNut]

Knowing the hose diameter would help with suggestions.
Basically its a ferrule. Just a fancy one.
If the hose will go back in, I would try to crimp it again.
I have a Milton 1626 stationary crimper but their are cheaper options.
If that didn’t work, I might consider the vise-grip style locking plier crimper used for welding hoses.

 

[larry_g]

Do you know the cause of the failure? Was it blown out under pressure or physically pulled out by accident? I am in agreement with those above who say that the piece in the tube is just there to prevent the tube from collapsing under the crimp. If I had that in hand I would try to reinsert the tube in the fitting and then use some heavy heat shrink over the whole joint and maybe a tightly wound string over that.

lg
no neat sig line

 

[GeoBruin]

It looks to me like the gray plastic 90° piece in the picture had a hose barb on the end and it broke off inside the tube. If that part can't be replaced (it looks like it might be integrated inside the sleeve) I would try to drill out the housing and screw in a brass hose barb.

The one pictured below hasmachine threads which might work if it's some kind of soft plastic, but otherwise they make them with course threads.

Edit: I think the scenario Merkyworks presented is more plausible. The part in the picture just doesn't look like hard plastic so I must also mold over a barb fitting. Better for OP though as that's an easier fix.

 

[no704]

Does the fitting unscrew? What’s on the other end? I’d replace the circuit with push connect fittings and nylon tube.

 

[Shiftless]

Was it blown out under pressure or physically pulled out by accident? I am in agreement with those above who say that the piece in the tube is just there to prevent the tube from collapsing under the crimp. If I had that in hand I would try to reinsert the tube in the fitting and then use some heavy heat shrink over the whole joint and maybe a tightly wound string over that.

Must have been pulled out by accident. It’s been used for nearly 1000 cycles. When I get over there to look at it, I’ll see if the tube will go back in. I like the heavy duty shrink wrap idea. That‘s more than a bit more elegant than a piece of rubber hose and 2 metal hose clamps.

 

[WWheeler]

Here in podunk USA we have a hydraulic/pneumatic hose company, sort of like a Parker store for farmers, that I just take off any sort of hose of any kind, and take it to them and they make me up a new one that will work for the application, though it may not look exactly the same. I don't get into the weeds on that sort of thing. I'm certainly not going out and trying to get into any specialty crimping tools for a one time use. I'm just a parts swapper.