Why is there no urine in the collection bag? http://www.vitalitymedical.com/external-catheter.html
- The condom catheter might be twisted or dislodged, preventing proper flow of urine to the bag.
- Tubing might be kinked or obstructed. Make sure to regularly inspect the tubing accessory.
- The external catheter may be too tight. If this is the case, the pressure would obstruct the urethra, preventing urine to freely flow into the collection bag.
- A vacuum can sometimes occur at the end of the condom catheter and can inhibit drainage. You can break the vacuum by briefly disconnecting the drainage device.
Vacuum relief valve http://www.hollister.com/en/continen...inenceglossary
A feature on Hollister Incorporated leg bag tubing, which helps prevent collapse of the tubing.
Vented leg bag
A special vacuum-relief mechanism featured on Hollister Incorporated oval kink-resistant tubing and the companion pouch, which also features an air vent. These combined features help to minimize a vacuum in the leg bag, as well as in the tubing. A vacuum is created as the urine cools outside the body. The vacuum may stall urine drainage through the tubing and/or prevent the leg bag from emptying completely.
Urine must be able to flow freely from the catheter, through the tubing, and into the bag. Before use, bags should be pulled apart gently. Aspirating the bag eliminates positive vacuum pressure. Thus, once the tube is assembled, urine will flow freely to the bag.
Vaccum Effect: Some men have an issue with the leg bag and urine is retaining in the tubing and the catheter is collapsing while on the penis. What is happening is a vacuum effect when the leg bag is drained. When the urine is draining it is pulling the air with it creating the vacuum effect. This collapses the catheter and will not allow all the urine to drain from the tubing and the bag will appear to be stuck together.
An easy way to alleviate this is to first make sure that there is a small pocket of air in the collection bag before the bag is used for the first time of the day. This can be done by blowing into the tubing before inserting the catheter in it. Then when the bag is drained do not drain the entire amount from the bag. Leave a small amount of urine in the bag ( an ounce or so) and this will prevent the vacuum you may experience. It should not interfere with the operation of the bag, but it’s better to not have this.
See Page 29 of this PDF: http://files.sld.cu/urologia-enferme...en_2008_lr.pdf
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