Some spacer devices have universal adaptors that allow them to be used with any pMDI actuator mouthpiece, while others have rigid adaptors that will only fit one shape of mouthpiece. These design features are sometimes reinforced by consideration of whether the spray from a particular pMDI matches the shape of the spacer, but may also be influenced by marketing considerations.
Advantages:
less impaction
less cooling of mucosa
no hand-breathing coördination necessary. One-way valve opens only with the onset of the inspiration
reduction of the local side-effects.
Disadvantage:
size inhalationroom : not practical
to long waiting between activation and inhalation, coördination is no longer necessary but there is evidence of reduction in percentage of aerosolparticles when patiënts are waiting to long
Wrong use of the spacer : starting of inspiration before aerosol is activated
variable dose
The material from which spacers are made of have a strong influence on the quantity and quality of the aerosolparticles. The inner wall of plastic inhalationrooms are strongly electrostatic loaded, hereby aerosolparticles are attracted to the wall of the chamber and become no more available for inspiration. This can result in variable dose. Different techniques are examined tot solve this problem. Use of anti-static cloath, priming , application of metal coating of the inner wall.
Some spacer devices have universal adaptors that allow them to be used with any pMDI actuator mouthpiece, while others have rigid adaptors that will only fit one shape of mouthpiece. These design features are sometimes reinforced by consideration of whether the spray from a particular pMDI matches the shape of the spacer, but may also be influenced by marketing considerations.
Advantages:
less impaction
less cooling of mucosa
no hand-breathing coördination necessary. One-way valve opens only with the onset of the inspiration
reduction of the local side-effects.
Disadvantage:
size inhalationroom : not practical
to long waiting between activation and inhalation, coördination is no longer necessary but there is evidence of reduction in percentage of aerosolparticles when patiënts are waiting to long
Wrong use of the spacer : starting of inspiration before aerosol is activated
variable dose
The material from which spacers are made of have a strong influence on the quantity and quality of the aerosolparticles. The inner wall of plastic inhalationrooms are strongly electrostatic loaded, hereby aerosolparticles are attracted to the wall of the chamber and become no more available for inspiration. This can result in variable dose. Different techniques are examined tot solve this problem. Use of anti-static cloath, priming , application of metal coating of the inner wall.
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