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Big misunderstanding! It turns out that the foley catheter really cannot be lubricated with paraffin oil!

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Author : Joe Wong
Update time : 2021-02-12 21:31:46
Big misunderstanding! It turns out that the foley catheter really cannot be lubricated with paraffin oil!

Not only do patients with urinary retention need a foley catheter, but almost all patients after surgery need an foley catheter, and even a large part of emergency consultations in urology is difficult to handle catheterization.

Catheterization can be said to be the basic operation of medical care.

It is common sense to lubricate the foley catheter with lubricant before catheterization. If you are using a disposable catheterization kit, the catheterization kit comes with a lubricant. According to the feel, most people assume that the lubricant is paraffin oil.

If you are using a single-packed foley catheter, and there is no ready-made lubricant, many people will shout before catheterization: some oil! Did the nurse really give you paraffin oil? (This may really be paraffin oil...)

What is the lubricant that comes with the catheterization kit?

Is it really paraffin oil?

In fact, the lubricant in the catheterization kit is usually simethicone. Foley catheters are mostly latex or silica gel components. According to the principle of organic matter compatibility, if you encounter paraffin oil, it will have a swelling effect, which may cause the air sacs in front of the catheter to rupture by itself. This situation is not uncommon in clinical practice.


On the one hand, the rupture of the airbag causes the catheter to fall off easily. On the other hand, the water in the airbag is drawn before the catheter is pulled out. The airbag ruptures naturally cannot extract the water. Inexperienced people will inevitably panic at this time and dare not easily extubate the catheter.

The effect of liquid paraffin on the urinary catheter balloon in descending order is latex catheter, lightly siliconized latex catheter, severely siliconized latex catheter, rubber catheter, and silicone catheter.

The State Drug Administration has issued an announcement stating that the rupture of the disposable urinary catheter balloon is mainly made of latex. The main reason for the rupture of the balloon of the catheter is that the petroleum-based lubricant is not used in accordance with the instructions. .


Screenshot of the official website of the State Drug Administration

What is used for catheterization when there is no lubricant?

Known paraffin oil is not available

There is a kind of urinary catheter called Ultra-Smooth Latex Urinary Catheter. It has a lubricating coating and is very slippery when it is soaked in saline. If you don't understand it, applying paraffin oil will be very astringent, and it will be superfluous.

How to lubricate the common urinary tube without lubricant?

Many people choose iodophor. After all, the iodophor cotton ball is used for disinfection before catheterization. The remaining iodophor cotton ball is at hand, so it is natural to make full use of it. Iodophor is indeed slippery, but can it replace lubricants? It is safe and effective in most cases.

But note: Very few people are allergic to iodophor. It has been reported that when doing laparoscopy in gynecology department, the pelvic cavity was washed with iodophor under the microscope, which resulted in anaphylactic shock. In one patient, the doctor directly injected iodophor into the pelvic cavity during the operation. As a result, he suffered shock. Fortunately, he was rescued. The post-mortem analysis also considered the anaphylactic shock caused by iodophor.

In order to improve the comfort of indwelling a urinary catheter, it can be considered to apply local anesthetics such as lidocaine gel, tetracaine gel, or bucaine gel on the urinary tube, which can have the dual effect of analgesia and lubrication.

Dimethicone is commonly used in gastrointestinal endoscopy, and it can also have a better lubricating effect when applied during catheterization, but the premise is latex catheter.

Silicone urinary catheters cannot be lubricated with methyl silicone oil, because methyl silicone oil can reduce the force between the molecular chains of silicone rubber, thereby reducing the pulling degree of the rubber catheter and increasing the rupture of the silicone catheter and balloon rupture risks of.

Those who are interested can pay attention to the fact that there is a sentence on the outer packaging of the catheter: Do not use lubricants containing petroleum bases!