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US 5,551,416 AGranted
Nebuliser and nebuliser control system
AssigneeMedix Limited
InventorsPhilip G. Stimpson, Andrew D. Hopkins
Life of this patent
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Abstract
A nebulizer for use in administering a medicament to a patient undergoing treatment for example, comprises an ultrasonic piezo-electric transducer (60) and a transducer drive system (D) which is caused to drive said transducer at or near its anti-resonant frequency. There is also provided means to optimize nebulized fluid particle size and transfer to the patients lungs for example, by operating at an anti-resonant frequency in the range of 1.36 to 1.56 MHz and having a single outlet baffle and relatively short outlet tube (24) arrangement.
Claims8
A nebuliser, comprising:
- an electrically-energisable ultrasonic transducer in the form of a piezo-electric crystal;
- a transducer drive system;
- and
- a high-frequency drive signal generated by the drive system for energising the transducer,
- the transducer being connected to the drive signal to receive said drive signal and the transducer, when energised by the drive signal, being operative to cause physical vibrations in a fluid to be nebulised,
- the transducer having a frequency-dependent impedance characteristic exhibiting a maximum impedance at an anti-resonance frequency corresponding to an anti-resonance condition of the crystal, the drive system further comprising frequency control means operable to adjust the frequency of the drive signal so as to be maintained substantially equal to the anti-resonance frequency.
3 more elements
Dependencies are inferred from the claim text.