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Yes, there is the rare potential for a catheter that was inserted dramatically to cause damage to the urethra. This can lead to scarring of the penis on rare occasion which can cause curvature to the penis. However, this would not cause any problems to interfere with your erections. I can't determine why your erections are suffering at this point but it sounds like you need to see a urologist for an examination to figure this out. You may need to be placed on medication such as Viagra or Cialis to help improve the blood flow to improve your erection. Your urologist can also evaluate your penis and urethra to see how much damage has occurred and whether not this will cause any further harm. Hope this helps and let me know if you have questions.