Arlyn, those look like Felco springs. Fiskers also uses that type of spring on one of their models.
Corona's have a fairly common spring. This is basically the same as my old Craftsman pruners. They are probably one of the most commonly used pruning shears. One of the nurseries I worked at gave us these to uses. The springs fell out a lot. Here's a replacement:
http://www.coronatools.com/ite...
The spring on the ARS is a little different than I've seen on other pruners.. It's a little looser/fatter coil than the Corona. They too have replacement parts:
http://www.growtech.com/HandPr...
If you do a lot of pruning, please treat yourself to a good pair of shears. The Felco and ARS models are a lot easier on your hands. I've tried many kinds, including cheaper look-alikes. My ARS clippers held a good sharp blade for months and months of heavy pruning. The downside is I need to have them professionally sharpened. Even being on the dull side, they still cut woody stuff amazingly well. The Felcos get dull faster, but are easier for me to sharpen, and replacement blades are available too. I use the smaller model (Felco and ARS) as the arc isn't as big, and I find it less fatiguing on the hands. Most of the pro-pruners I know use either, or both of these brands, although the Aesthetic Pruners have mostly gone to the ARS camp.