Material and Design:
The core of the injection pen cartridge is composed of high-quality borosilicate glass, chosen for its chemical stability, transparency, and resistance to thermal shock. Borosilicate glass ensures that the medication inside remains uncontaminated and unchanged over its shelf life. The 3ml capacity is a common size, suitable for a typical dosage range, allowing patients to carry a sufficient volume of medication while maintaining portability.
The cartridges are designed to be compatible with various injection pens, facilitating easy installation and replacement. The cylindrical shape and smooth surface of the cartridge enable a secure fit into the pen mechanism, ensuring precise dose dispensing without leaks.
Aluminum Lid and Rubber Stopper:
Sealing the cartridge is critical in maintaining sterility and preventing leakage. The cartridges are capped with an aluminum lid that provides a durable, tamper-evident seal. Aluminum lids are lightweight, corrosion-resistant, and compatible with various sealing techniques such as crimping, which tightly secures the lid to the cartridge flange.
Underneath the aluminum lid lies a rubber stopper, typically made from medical-grade elastomers such as bromobutyl or chlorobutyl rubber. These materials are chosen for their excellent chemical compatibility, low permeability to gases and vapors, and ability to maintain a secure seal while allowing the cartridge to be pierced by the pen's needle or dosing mechanism without fragmenting or degrading.
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