Medical Nebulisers

A nebuliser converts a liquid into an aerosol that is inhaled through a mask or mouthpiece. This section covers compressor nebulisers for clinical and home use, along with the masks, cups, tubing and filters that they consume.

Which device is appropriate, what it is used with and how it is used are matters for the healthcare professional responsible for the patient. This page describes the equipment and how models differ. It sits within the medical devices range.

How a compressor nebuliser is built

Four parts make up the system, and only one of them is the machine.

The point that this makes clear is the one that decides the real cost: the compressor is the durable part and everything it touches is consumable. A unit compared only on purchase price ignores four items that are replaced on a schedule.

The cup is the part that determines performance

It is the component least discussed and the one that most affects how the device behaves.

The nebuliser cup — the chamber where the liquid sits — is where the aerosol is actually formed, by air passing through a narrow jet. That jet is a precision opening, and with repeated use and cleaning it widens. When it does, the aerosol characteristics change while the machine appears to run exactly as before.

Manufacturers state a replacement interval for the cup, usually in months of normal use rather than in sessions. It is the figure to look for, because a device running with a worn cup has no visible symptom: it still hums, it still produces mist.

The same applies to the air filter: a saturated filter restricts intake and makes the compressor work harder, which shortens its life. Both are supplied as separate references and should be confirmed as available before standardising on a model.

Continuous duty and clinical use

This is the specification that separates a unit built for a clinic from one built for a household, and it appears in the product name rather than in a table.

A nebuliser rated for continuous operation can run back to back without a cooling pause. One rated for intermittent use will need to rest between sessions, which in a clinic with successive patients means the second one waits.

Alongside it, the two figures that matter in a clinical setting are the noise level, because the device runs in a consulting room, and whether the cup and tubing can be disinfected or are single-patient. Where the unit serves more than one patient, that determines the whole cleaning routine.

Portable and mains-powered units

Portable models run on a rechargeable battery and are chosen for use away from a socket.

Two things are worth confirming beyond the battery itself: the runtime per charge relative to a full session, since a session that outlasts the battery is a session interrupted, and whether the battery is available as a spare. On any battery device, the cell is the component that ages regardless of use, and one that cannot be replaced turns the whole unit into a consumable.

Mains-powered units have no such limit and are the standard where the device stays in one place.

Masks and mouthpieces

The interface is chosen for the patient rather than for the machine, and the sizes are not interchangeable.

Masks are supplied in adult and child sizes, in soft and rigid materials, and some models are specific to a given manufacturer's cup. A mouthpiece is the alternative interface where the patient can hold it, and a nasal piece covers a third configuration.

What to confirm before ordering a batch is the compatibility with the cup in use: the connector diameter varies, and a mask that does not seat properly leaks at the joint. As with everything downstream of the compressor, these are references specific to a model rather than universal.

Cleaning between uses

The cup, mask and mouthpiece are in contact with the patient and with the liquid, which puts them in a different category from the compressor.

Each manufacturer specifies the cleaning method and whether the parts can be disinfected, boiled or only rinsed. What is worth confirming is whether they tolerate the process the setting already uses, because a part that cannot go through it needs a separate routine.

The tubing is the item most often overlooked: it cannot be cleaned internally in any practical way, which is why it is replaced rather than disinfected.

Related equipment

In a consulting room, nebulisers are commonly found alongside other respiratory and monitoring equipment: spirometers for lung function assessment, pulse oximeters for oxygen saturation, and suction units where aspiration is required.

Power supply and installation

Medical equipment is largely manufactured in continental Europe, so a unit may be supplied with a European Schuko plug rather than a UK three-pin BS 1363. Confirming the plug type with each model and arranging an adaptor or a fitted UK plug in advance avoids a device that cannot be used on the day it arrives.

What to check before buying

• Continuous or intermittent duty, according to how many patients follow one another
• Replacement interval for the cup, and its availability as a separate reference
• Filter and tubing availability, and the replacement schedule
• Mask and mouthpiece compatibility with the cup in use, and the sizes supplied
• Cleaning method the manufacturer specifies for the patient-contact parts
• Battery runtime and spare availability on portable models
• Plug type on mains-powered units

Nebulisers are medical devices. Their indication, what is used with them, dosage and frequency are determined by the healthcare professional responsible for the patient, and each manufacturer states the operating conditions and limitations for its device in the accompanying documentation.

Frequently asked questions

What is a medical nebuliser?

A device that converts a liquid into an aerosol which is then inhaled through a mask or mouthpiece. A compressor nebuliser does this by passing air through a jet inside a cup that holds the liquid. Its indication and use are determined by the healthcare professional responsible for the patient.

What is the difference between a nebuliser and an inhaler?

They are different delivery devices. An inhaler is a self-contained handheld unit that releases a measured amount in a single actuation. A nebuliser is a powered device that produces a continuous aerosol over several minutes, delivered through a mask or mouthpiece. Which is appropriate in a given case is a clinical decision.

Which parts of a nebuliser are consumable?

Everything downstream of the compressor: the cup, the mask or mouthpiece, the air tubing and the air filter. The compressor unit lasts years; the parts it connects to are replaced on a schedule the manufacturer states. A device compared only on purchase price ignores four items that are replaced periodically.

How often should the nebuliser cup be replaced?

Manufacturers state an interval, usually in months of normal use. The reason it matters is that the cup contains a precision jet which widens with repeated use and cleaning, changing the aerosol characteristics while the machine appears to run exactly as before. There is no visible symptom: it still runs and still produces mist.

What does continuous operation mean?

That the unit can run back to back without a cooling pause. One rated for intermittent use needs to rest between sessions, which in a clinic with successive patients means the next one waits. It is the specification that separates a device built for a clinic from one built for a household.

Are masks interchangeable between nebulisers?

Not necessarily. Connector diameters vary and some masks are specific to a given manufacturer's cup, so a mask that does not seat properly leaks at the joint. Masks come in adult and child sizes and in soft or rigid materials, and compatibility should be confirmed with the cup in use before ordering a batch.

How are the parts cleaned?

Each manufacturer specifies the method and whether the parts can be disinfected, boiled or only rinsed, and what is worth confirming is whether they tolerate the process the setting already uses. The tubing is the exception: it cannot be cleaned internally in any practical way, which is why it is replaced rather than disinfected.

Can a portable nebuliser be used away from a socket?

Yes, portable models run on a rechargeable battery. Two things are worth confirming: the runtime per charge relative to a full session, since a session that outlasts the battery is a session interrupted, and whether the battery is available as a spare, because the cell ages regardless of use and one that cannot be replaced turns the whole unit into a consumable.

Does the nebuliser come with a UK plug?

Medical equipment is largely manufactured in continental Europe, so a unit may be supplied with a European Schuko plug rather than a UK three-pin BS 1363. It is worth confirming the plug type with each model and arranging an adaptor or a fitted UK plug in advance.