Injection device having anti-coring needle

• US 5,868,721 A
• Filed: 05/01/1997
• Issued: 02/09/1999
• Est. Priority Date: 10/19/1995
• Status: Expired due to Term

• Current Assignee: Survival Technology, Inc. (Meridian Medical Technologies Incorporated)
• Original Assignee: Meridian Medical Technologies Incorporated
• Inventors: Pearson, William Robert, Spady, David Edward, Marinacci, Robert A., Dalling, N. Lawrence
• Primary Examiner(s): Stright, Jr., Ronald
• Assistant Examiner(s): Nguyen, A. T.
• Application Number:
  US08/850,220
• Time in Patent Office: 649 Days
• Field of Search: 604/87, 604/117, 604/232, 604/234, 604/239, 604/244, 604/272-274, 604/411, 604/413
• US Class Current: 604/272
• CPC Class Codes: A61M 5/2033 Spring-loaded one-shot injectors with or without automatic needle insertion multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287
• CPC Class Codes: A61M 5/24 Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic ampoules or carpules A61J1/06
• CPC Class Codes: A61M 5/2466 by piercing without internal pressure increase A61M5/2429 takes precedence
• CPC Class Codes: A61M 5/3286 Needle tip design, e.g. for improved penetration
• CPC Class Codes: A61M 5/3291 Shafts with additional lateral openings

Abstract

An injection device which includes a container constructed and arranged to contain a medicament, a medicament disposed within the container, a seal constructed and arranged to seal the medicament in the container, and a hypodermic needle. The hypodermic needle has a tubular, elongated, generally cylindrical wall defining an internal longitudinal bore extending longitudinally through the cylindrical wall along a longitudinal axis. The cylindrical wall forms a forward end defining a forward opening of the bore and a rearward end defining a rearward opening of the bore, the cylindrical wall having a laterally facing opening spaced closer to the rearward opening of the longitudinal bore than the forward opening of the longitudinal bore. The longitudinal bore is restricted at a position between the rearward opening and the laterally facing opening. The forward end has a point constructed and arranged to pierce an individual'"'"'s flesh, the rearward end having a point constructed and arranged to pierce the seal so that the rearward opening and the laterally facing opening establish fluid communication with the medicament to enable the medicament to be dispensed through the bore and into the individual'"'"'s flesh.

Claims

1. An injection device comprising:

a container constructed and arranged to contain a medicament;

a medicament disposed within said container;

a seal constructed and arranged to seal the medicament in the container; and

a hypodermic needle comprising a tubular, elongated, generally cylindrical wall defining an internal longitudinal bore extending longitudinally through the cylindrical wall along a longitudinal axis,

said cylindrical wall forming a forward end defining a forward opening of said bore and a rearward end defining a rearward opening of said bore, said cylindrical wall having a laterally facing opening spaced closer to the rearward opening of said longitudinal bore than the forward opening of said longitudinal bore,

said longitudinal bore being restricted at a position between said rearward opening and said laterally facing opening,

said forward end having a point constructed and arranged to pierce an individual'"'"'s flesh, said rearward end having a point constructed and arranged to pierce said seal so that said rearward opening and said laterally facing opening establish fluid communication with said medicament to enable said medicament to be dispensed through said bore and into the individual'"'"'s flesh.

2. The injection device according to claim 1, wherein:

said rearward end of said needle terminates in an annular end surface having a rearwardmost point lying in an imaginary plane disposed perpendicularly to said longitudinal axis, said annular rearward end surface defining an imaginary plane inclined with respect to said imaginary plane perpendicular to said longitudinal axis, and

wherein said laterally facing opening is generally in longitudinal alignment with said rearwardmost point so that when said rearward end pierces said seal, any tethered particle formed in said seal as a result will be disposed on a side of said hypodermic needle generally opposite a side on which said laterally facing opening is disposed.