Attach a giving set (which is attached to an empty drip bag) to the end of the catheter and ensure the giving set is 'open'. This will ensure the patient stays clean and dry from urine as all bladder contents will go into the drip bag.
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urine passes through the drip chamber fine, sometimes u need to squeeze it through.
i generally use a peg and peg the bag to the lower kennel or lie it on the floor.
finally one more tip, either tape or coflex the line to the cats tail, this means there is no pulling directly on the urinary catheter and the tension is taken up by the cats tail. i normally tape it in 2 places one lower down than the other.