Bands of heat shrink tubing can be used as micro hose clamps on balloon catheters
and other devices to reinforce bonds and help prevent failure under pressure. A
narrow band of heat shrink tubing is applied over the end of the balloon. The polyester
tubing, with its high hoop strength, grips the part much like a hose clamp, reinforcing
the bond and keeping it from lifting off. It also provides a smooth transition without
adding significantly to the bond diameter. The tubing can also be used to terminate
braiding, spring coils and other parts to provide a smooth transition.
Clear 1 mm bands of polyester shrink tubing are shrunk
over both ends of this latex balloon (shown uninflated and partially inflated).
The shrink tubing acts like hose clamps to reinforce the bonds and therefore prevent
the inflated balloon from peeling away from the catheter tube and leaking.
The key properties of polyester heat shrink tubing in micro hose clamp applications
are:
- Has substantial hoop strength to reinforce bonds and other areas
- Very thin so it does not add significantly to the device diameter
- Can help smooth diameter transitions
- Can be used to terminate braiding, springs, etc.
- Adhesive can be UV-cured through the clear tubing