Pen needle assembly for intradermal injection
AssigneeBecton, Dickinson and Company
InventorMin Wei
Life of this patent
Estimating the term…
Abstract
A pen needle assembly (111) includes an outer shell (151) having a first end adapted to contact a patient's skin at an injection site. A hub (131) is movably disposed within the outer shell. A needle (121) is fixed to the movable hub and has a patient end for piercing the skin at the injection site. An inner shell (171) is disposed within the outer shell and adapted to engage the pen needle assembly with a drug delivery pen (100). A first spring (141) has a first end connected to the outer shell and a second end connected to the inner shell. A second spring (161) has a first end connected to the inner shell and a second end connected to the hub. An adhesive layer (191) is disposed on the movable hub for contacting and raising the skin at the injection site.
Claims22
A pen needle assembly, comprising:
- an outer shell having a first end configured to engage the skin of a patient and a second end;
- an inner shell disposed within said outer shell and engageable with a drug delivery device, said inner shell being slidable within said outer shell and having a first end and a second end,
- a hub movably disposed within said outer shell and being movable relative to said outer shell and inner shell;
- a needle rigidly fixed to said hub;
- an adhesive layer disposed on said hub;
- a first spring coupled to said outer shell and to said inner shell to retract said inner shell toward said second end of said outer shell;
- a second spring extending between said inner shell and hub to bias said hub away from said first end of said inner shell;
- wherein said hub and inner shell move downwardly relative to said outer shell during an injection to adhere said adhesive layer on a patient's skin and move upwardly relative to said outer shell to raise the patient's skin to facilitate the injection.
A pen needle assembly, comprising:
- an outer shell having a first end adapted to engage a patient's skin at an injection site;
- a hub movably disposed within said outer shell;
- a needle fixed to said hub and having a patient end for piercing the skin at the injection site;
- an inner shell disposed within said outer shell and engageable with a drug delivery pen, said hub being movable relative to the inner shell;
- a first spring having a first end connected to said outer shell and a second end connected to said inner shell;
- a second spring having a first end connected to said inner shell and a second end connected to said hub;
- an adhesive layer disposed on said movable hub for contacting and raising the skin at the injection site;
- and
- a retaining latch disposed between said hub and said inner shell to prevent movement of said hub relative to said inner shell when said retaining latch is engaged with said inner shell.
A drug delivery pen, comprising:
- a medicament cartridge;
- an outer shell having a first end adapted to engage a patient's skin at an injection site;
- a hub movably disposed within said outer shell;
- a needle fixed to said movable hub and having a patient end for piercing the skin at the injection site;
- an inner shell disposed within said outer shell and adapted to engage said a lower housing of the drug delivery pen;
- a first spring having a first end connected to said outer shell and a second end connected to said inner shell to retract said inner shell and hub with respect to said outer shell;
- a second spring having a first end connected to said inner shell and a second end connected to said hub to bias said hub away from said inner shell;
- and
- an adhesive layer disposed on said movable hub for contacting and raising the skin at the injection site.
A method of facilitating medicament injection, comprising the steps of:
- moving an outer shell of a pen needle assembly upwardly relative to an inner shell and a needle hub by pushing downwardly on a pen needle assembly on a patient's skin at an injection site;
- flexing a projection of the hub of the pen needle assembly inwardly responsive to the upward movement of the outer shell to unlock the hub from the inner shell;
- moving the hub downwardly responsive to the unlocking of the hub relative to the inner shell and outer shell to contact an adhesive layer disposed on the hub with the patient's skin at the injection site;
- and
- retracting the inner shell and hub relative to the outer shell and raising the skin at the injection site upwardly, thereby facilitating the injection.
Dependencies are inferred from the claim text.