Two-chamber cartridge for propellant-free metering aerosols
View Patent ↗A cartridge for propellant-free administration of a liquid pharmaceutical composition by inhalation includes: an elongate displacing device including an upper end and a lower end, the lower end for at least partial insertion into a container; a cartridge chamber disposed at the lower end of the displacing device and operable store a pharmaceutical formulation, the cartridge chamber including at least one pierceably sealed opening; and a cannula guide extending from the upper end of the displacing device to the cartridge chamber, wherein insertion of a cannula through the guide pierces the sealed opening and releases the pharmaceutical formulation into a liquid solvent in the container to form the liquid pharmaceutical composition.
1. A cartridge for propellant-free administration of a liquid pharmaceutical composition by inhalation, comprising:
an elongate displacing device including an upper end and a lower end, the lower end for at least partial insertion into a container;
a cartridge chamber disposed at the lower end of the displacing device and operable to store a pharmaceutical formulation, the cartridge chamber including at least one pierceably sealed opening;
a cannula guide extending from the upper end of the displacing device to the cartridge chamber;
a first pierceably sealed opening disposed between the cartridge chamber and the guide; and
a second pierceably sealed opening disposed between the cartridge chamber and the container, which is sealed with a sealing film including one or more frangible points between the sealing film and a periphery of the second opening such that when the first opening is pierced by pressure, the sealing film tears at the one or more frangible points,
wherein insertion of a cannula through the guide pierces the first pierceably sealed opening causing the second pierceably sealed opening to open and releases pharmaceutical formulation into a liquid solvent in the container to form the liquid pharmaceutical composition.
2. The cartridge of claim 1 , wherein the displacing device is adapted to displace a portion of a solvent in the container when at least the lower end of the displacing device is inserted into the container.
3. The cartridge of claim 1 , wherein first opening is sealed by a septum and the second opening is sealed with a sealing film.
4. The cartridge of claim 3 , wherein the septum is made from a resilient material such that after piercing by the cannula, it is sealed off.
5. The cartridge of claim 1 , wherein a lower end of the displacing device is chamfered.
6. The cartridge of claim 5 , wherein the chamfering of the displacing device is between about 20° to its vertical axis.
7. The cartridge of claim 1 , wherein the active, pharmaceutical substance is in one of dry form and liquid form.
8. The cartridge of claim 7 , wherein the active pharmaceutical substance is in the form of a tablet.
9. The cartridge of claim 8 , wherein the tablet is between 2 and 3 mm in diameter and between 1.0 and 4.0 mm long.
10. The cartridge of claim 8 , wherein the tablet has a hardness of between 2 and 10 N/mm 2 .