I had a poor feline with a very blocked proximal urethra, and numerous attempts to pass various kinds of [feline] urinary catheter proved unfruitful.
I’m indebted to a young colleague who helped by using two stay sutures through the prepuce to hold the penis in position – this puss was in good body condition, and this really helped expose and stabilise the penis.
My colleague then used a 22G venous catheter inserted to the level of urolith, and a bit of hydro-propulsion, and we had easily passed a catheter.
I must remember that one – thanks Dan (Preece).
The standard (Jackson-type) tomcat catheter (A) is stiff with a metal stylet and has rough side holes, so is traumatic.
The Slippery Sam (B) has end hole or side holes, is atraumatic and stiff, so good for initial unblocking. The Little Herbert adapter (C) is also shown as it makes it easier when attaching the catheter (B) to a closed collection system.
The hub of the Slippery Sam catheter is not firmly attached to the insertion tube, so it is recommended not to be left in situ more than six hours. The Fioniavet tomcat catheter (D) has an end hole, is atraumatic and stiff, so good for initial unblocking.