Method of making a cartridge for a medicament respiratory delivery device
A medicament respiratory delivery device including a housing having a chamber, an inlet and an outlet generally coaxially aligned with the chamber, wherein the chamber includes a medicament cartridge having a body including a generally cylindrical passage extending through the opposed ends of the cartridge generally coaxially aligned with the inlet and outlet of the housing having thin burstable polyolefin membranes having a burst pressure of between 1.2 and 10 atmospheres stretched taut over the ends of the cartridge, such that fluid delivered to the inlet ruptures the membranes, entraining medicament contained within the cartridge passage which is delivered to the patient's respiratory system through the outlet. The method of forming the cartridge includes stretching out and bending a membrane to one end of the cartridge, preferably by heat bonding, filling the cartridge with a medicament and sealing the opposed end preferably with a second burstable membrane by stretching out a membrane over a convex surface and heat bonding.
1. A method of making a cartridge for a medicament respiratory delivery device comprising the following steps:
forming a cartridge having first and second ends and a passage through said first and second ends of said cartridge comprising a convex surface surrounding said passage on said second end of said cartridge;
forming a thin polymeric film over said passage through said first end of said cartridge, sealing said passage through said first end;
inserting a medicament into said passage through said second end of said cartridge; and
stretching a thin polyolefin film having a burst pressure of less than 10 atmospheres taut over said passage and said convex surface surrounding said passage at second end of said cartridge and
bonding said thin polyolefin film to said convex surface at said second end of said cartridge, sealing said passage through said second end.
2. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 1 , wherein said method includes
bonding said thin polyolefin film to said convex surface by applying a heated die to said thin polyolefin film, heat bonding said thin polyolefin film to said convex surface.
3. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 1 , wherein said
thin polyolefin film has a thickness of between 0.3 and 1.5 mils and a burst pressure of between 1.2 and 10 atmospheres.
4. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 3 , wherein said method includes
forming said cartridge having generally conical surfaces at said first and second ends surrounding said passage and
stretching thin polyolefin films taut over said generally conical surfaces at said first and second ends of said cartridge and bonding said polyolefin films to said generally conical surfaces.
5. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 4 , wherein said method includes
heat bonding of said polyolefin films.
6. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 1 , wherein said method includes
forming a generally cylindrical passage through said cartridge through said first and second ends.
7. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 1 , wherein said method includes
stretching a thin preferentially oriented polyethylene film over said second end of said cartridge and heat bonding said preferentially oriented polyethylene film on said second end of said cartridge.
8. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 7 , wherein said method includes
sealing said passage through said first end of said cartridge by stretching a thin preferentially oriented polyethylene film over said first end of said cartridge,
wherein said thin preferentially oriented polyethylene film over said first end of said cartridge is oriented at approximately right angles to said thin preferentially oriented polyethylene film stretched over said second end of said cartridge.
9. A method of making a cartridge for a medicament respiratory delivery device comprising the following steps:
providing a medicament;
forming a polymeric cartridge having opposed first and second ends, a passage through said cartridge and a convex surface surrounding said passage through said second end of said cartridge and said passage extending through said cartridge through said first and second ends for receipt of said medicament;
forming a first thin polymeric film over said passage through said first end of said cartridge, sealing said passage through said first end; and
stretching a second thin polyolefin film having a burst pressure of less than 10 atmospheres taut over said convex surface at said second end and heat bonding said thin burstable polyolefin film to said second end of said polymeric cartridge.
10. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 9 , wherein said method includes
forming said convex surface at said second end of said polymeric cartridge with a frustoconical surface surrounding said passage and
stretching taut said thin burstable polyolefin film over said frustoconical surface and heat bonding said polyolefin film on said frustoconical surface.
11. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 9 , wherein said method includes
heat bonding said polymeric film to said first end of said cartridge.
12. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 11 , wherein said first thin polymeric film is a preferentially oriented polyethylene film and said second thin polyolefin film is a preferentially oriented polyethylene film wherein said first and second preferentially oriented polyethylene films on said opposed first and second ends of said cartridge are oriented at an angle other than parallel.
13. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 12 wherein said first and said second thin polymeric films are different materials.
14. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 12 , wherein said method includes
orienting said first and second preferentially oriented polyethylene films on said first and second ends of said cartridge at approximately 90 degrees.
15. The method of making a cartridge for a medicament respiratory delivery device as defined in claim 14 wherein said first and said second thin polymeric films are different materials.