Cannula Assembly for Higher Viscosity Injectable Drugs
OwnerMinhong Yuinventor
Life of this patent
Estimating the term…
Abstract
A cannula needle for reducing injection force in connection with high viscosity fluid medications or medications with wide viscosity ranges. The cannula needle includes a skin penetrating segment, an enlarged rear end segment, and a transition segment disposed between the skin penetrating segment and the enlarged rear end segment. The skin penetrating segment includes a substantially uniform outer diameter and a substantially uniform inner diameter for patient comfort. The enlarged rear end segment has an inner diameter that is greater than the inner diameter of the skin penetrating segment. The transition segment includes a funnel shape for fluidly connects the inner diameter of the enlarged rear end segment and the inner diameter of the skin penetrating segment.
Claims19
A cannula assembly comprising:
- a syringe barrel defining a chamber, the chamber extending from a first end to a second end;
- a syringe hub disposed adjacent the second end of the chamber;
- and
- a needle including:
- a skin penetrating segment having a substantially uniform outer diameter and a substantially uniform inner diameter,
- an enlarged rear end segment having an inner diameter that is greater than the inner diameter of the skin penetrating segment, at least a portion of the enlarged rear end segment being disposed within the syringe hub such that the needle is in fluid communication with the chamber of the syringe barrel, and
- a transition segment disposed between the skin penetrating segment and the enlarged rear end segment for fluidly connecting the inner diameter of the enlarged rear end segment and the inner diameter of the skin penetrating segment, the transition segment including a funnel shaped inner diameter.
A cannula needle comprising:
- a skin penetrating segment having a substantially uniform outer diameter and a substantially uniform inner diameter;
- an enlarged rear end segment having an inner diameter that is greater than the inner diameter of the skin penetrating segment, the enlarged rear end segment being dimensioned and configured to be disposed within a syringe hub for fluidly connecting the cannula needle to a cannula assembly;
- and
- a transition segment disposed between the skin penetrating segment and the enlarged rear end segment for fluidly connecting the inner diameter of the enlarged rear end segment and the inner diameter of the skin penetrating segment, the transition segment including a funnel shaped inner diameter.
Dependencies are inferred from the claim text.