Abstract:
There are disclosed pressurised aerosol compositions comprising a medicament, a hydrofluorocarbon propellant and a polyethoxylated surfactant, the compositions containing substantially no solvent, other than the propellant, capable of increasing the solubility of the surfactant in the propellant. The compositions according to the invention are advantageous in that the solubility of the surfactant is such as to ensure good dispersion of the medicament and smooth operation of the aerosol valve.
Abstract:
A quadrupole mass filter (1) includes a controllable RF oscillator (7) which follows any drift in the resonant frequency of a resonant circuit means (8), this circuit means (8) amplifying an alternating RF potential from the oscillator (7) and supplying it to the filter electrodes (2, 3, 4, 5). To ensure that the charge to mass ratio of the particles transmitted by the filter remains constant, a signal for controlling the amplitude of the oscillator (7) is corrected in response to any resonant frequency shift. This signal is also fed to DC supply means (12, 13, 15), to ensure that the amplitude of the DC potential applied to the electrodes (2, 3, 4, 5) remains in the correct ratio to the RF potential amplitude so that the filter resolution remains constant.
Abstract:
An apparatus for the production of aerosols from liquid samples for elemental analysis comprises means for generating droplets of the liquid sample (1), and means for subjecting the droplets so formed to rapid radiative heating (2, 21, 22) so as to evaporate liquid from the sample droplets. The heating means preferably comprises a heating chamber (2) positioned at one focus of a reflector (22) and a heat-bar (21) positioned at the other focus.
Abstract:
A medicament inhalation device includes a housing (1) having a through-going pathway (2) connecting an air inlet (3) with an air outlet (4), a medicament reservoir (7) adapted to receive a compacted body of powdered medicament (8), and metering means for dispensing a predetermined dose of medicament from the reservoir (7) into the through-going pathway (2), the metering means including means (18) for abrading the compacted body (8); the device is provided with a shutter (9) movable between a first position in which the compacted body (8) is isolated from the through-going pathway (2) and a second position in which the compacted body (8) is in communication with the through-going pathway (2) such that a dose of medicament can be dispensed from the reservoir (7) into the through-going pathway (2).
Abstract:
Pressurised aerosol composition comprising a liquified hydrofluorocarbon propellant containing substantially no non-hydrofluorocarbon solvent, having dispersed therein a medicament and a fluorinated surfactant. Preferred surfactants include FC 430 and FC 431.
Abstract:
Un appareil pour l'analyse d'un composé chimique ou biochimique comprend un biodétecteur optique résonant (1-4) disposé sur le trajet optique entre une source de lumière monochromatique (5) montée pivotante et un détecteur stationnaire (12) conçu pour mesurer une caractéristique particulière de la lumière. On prévoit un moyen (7) pour assurer le mouvement de pivotement de la source de lumière (5) permettant de faire varier l'angle d'incidence de la lumière arrivant sur le détecteur (1-4). On fournit également un moyen pour mesurer l'angle d'incidence instantané. Le moyen pour faire varier l'angle d'incidence de la lumière arrivant sur le détecteur peut être un dispositif à came (7) agissant sur un élément pivotant (6) portant la source de la lumière (5) et le moyen pour mesurer l'angle d'incidence instantané de la lumière arrivant sur le détecteur (1-4) peut comporter un moyen pour compter le nombre de pas effectués par un moteur pas-à-pas entraînant le dispositif à came (7).
Abstract:
Composition pour aérosol sous pression, comprenant un hydrofluoralcane liquéfié, un médicament en poudre pouvant y être dispersé ainsi qu'un polymère soluble dans l'hydrofluoralcane liquéfié, le polymère comprenant des unités structurales récurrentes choisies parmi des unités contenant un amide et des unités contenant un ester d'acide carboxylique.
Abstract:
The invention provides methods and apparatus for atomic emission spectroscopy and for mass spectrometry which make use of an inductively coupled radio-frequency plasma torch. A radio-frequency power supply supplies energy to a plasma induction coil via reflectometer means and a matching network. A signal indicative of reflected power generated by the reflectometer is used to set the frequency of the power supply to the resonant frequency of the matching network and plasma induction coil, thereby ensuring the maximum efficiency of power transfer irrespective of the state of the plasma. Preferably a solid state power amplifier is employed in conjunction with a lower power variable frequency oscillator. Means for ensuring proper ignition of the plasma while maintaining the frequency of the power generator within a governmentally specified frequency band are also provided.