Pen needle assembly
A pen needle, comprising a reusable adapter configured for attachment to a distal end of a medication pen, the adapter having a proximal needle for accessing the interior of the pen injector and a fitting on the distal side for mating with a patient end needle assembly, and a disposable patient-end needle assembly having a base configured for mating with the fitting on the distal side of the adapter and a patient-end needle extending from a distal end of the base.
1. A pen needle, comprising:
a reusable adapter configured for attachment to a distal end of a medication pen, the adapter having a proximal adapter needle for establishing fluid communication with an interior of the medication pen and a fitting on a distal side for mating with a disposable patient end needle assembly; wherein
the disposable patient-end needle assembly includes a base configured for mating with the fitting on the distal side of the adapter and a patient-end needle extending from a distal end of the base; and
the adapter includes a valve or septum to prevent fluid leakage from the interior of the medication pen.
2. The pen needle according to claim 1 , further comprising a cover on the disposable patient-end needle assembly, mating with the base and forming a sterile enclosure around the patient-end needle prior to use.
3. The pen needle according to claim 2 , wherein the disposable patient-end needle assembly further includes a peelable label as part of the sterile enclosure around the patient-end needle prior to use.
4. The pen needle according to claim 1 , wherein the fitting on the adapter is tapered and the disposable patient-end needle assembly engages and locks onto the tapered fitting for a leak-free engagement of the disposable patient-end needle assembly and the adapter.
5. The pen needle according to claim 4 , wherein the disposable patient-end needle assembly includes a portion corresponding to the taper on the fitting of the adapter.
6. The pen needle according to claim 1 , wherein the fitting surrounds an orifice of the adapter.
7. The pen needle according to claim 1 , wherein the adapter is provided with a cap to cover an orifice on the distal side of the adapter when the disposable patient-end needle assembly is not present.
8. The pen needle according to claim 1 , wherein the adapter needle comprises a plastic non-patient end needle integrally molded with a hub of the adapter.
9. The pen needle according to claim 1 , wherein the fitting of the adapter is configured to mate with locking protrusions of the disposable patient-end needle assembly.
10. The pen needle according to claim 9 , wherein the locking protrusions locks a distal end of the fitting located on an inside of the adapter so that a corresponding portion engages the fitting for a leak-free engagement of the disposable patient-end needle assembly and the adapter.