Apparatus and method for analysis of dry powder inhaler products
An apparatus and method are provided for collection and analysis of dry powder inhaler products to determine foreign particulate matter found therein. The apparatus includes a collection chamber that communicates directly with the mouthpiece of a dry powder inhaler device. The collection chamber is used to both collect product samples, as well as to mix the samples with a diluent that places the active pharmaceutical components and excipients in solution, while the foreign particulate matter remains suspended. Analysis of a sample is preferably conducted by light obscuration wherein a probe is inserted directly within the collection chamber of the apparatus. An integral magnetic stir-bar incorporated within the apparatus eliminates the need to transfer the collected sample to a secondary vessel for mixing or analysis.
1. A particulate matter collection apparatus comprising:
a body defining a collection chamber therein;
a vacuum adapter removably connected to a first end of said body, said vacuum adapter having an orifice communicating with a vacuum source, and said vacuum adapter having a filter seat disposed therein;
a filter placed on said filter seat of said vacuum adapter;
an end cap removably connected to a second end of said body; and a stir-bar assembly mounted in said collection chamber, said stir-bar assembly including a rotatable magnetic stir-bar suspended in said collection chamber.
2. An apparatus, as claimed in claim 1 , wherein:
said collection chamber is cylindrical shaped.
3. An apparatus, as claimed in claim 1 , wherein:
said filter seat protrudes from a base of said vacuum adapter, said filter seat including an upper surface with a plurality of grooves formed thereon and communicating with said orifice thereby distributing a vacuum across said filter when said vacuum source is activated.
4. An apparatus, as claimed in claim 1 , wherein:
said second end of said body has a flange extending beyond said body to receive said end cap.
5. An apparatus, as claimed in claim 1 , wherein:
said stir-bar assembly further includes;
at least one support extending transversely across said chamber to mount said stir-bar assembly within said chamber;
a base secured to said support and said rotatable magnetic stir-bar extending from said base;
a pin mounted in said base and connected to said magnetic stir-bar thereby facilitating rotation of said magnetic stir-bar.
6. An apparatus, as claimed in claim 1 , wherein:
said magnetic stir-bar includes four stir-bar sections disposed in spaced relation to one another within said collection chamber.