Method of making an elongate syringe barrel

• US 7,922,958 B2
• Filed: 06/30/2010
• Issued: 04/12/2011
• Est. Priority Date: 08/03/2006
• Status: Active Grant

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: Becton, Dickinson & Co
• Inventors: Schiller, Eric, D'Arrigo, Christina Joy, Economou, Anthony
• Primary Examiner(s): HEITBRINK, JILL LYNNE
• Application Number:
  US12/827,293
• Publication Number:
  US 20100314796A1
• Time in Patent Office: 286 Days
• Field of Search: 264/318, 264/328.1, 425/DIG.58, 249/59
• US Class Current: 264/318
• CPC Class Codes: A61M 2005/31516 reducing dead-space in the syringe barrel after delivery
• CPC Class Codes: A61M 5/3202 Devices for protection of the needle before use, e.g. caps A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001
• CPC Class Codes: A61M 5/347 rotatable, e.g. bayonet or screw A61M5/344 takes precedence
• CPC Class Codes: B29C 45/33 having transversely, e.g. radially, movable mould parts
• CPC Class Codes: B29C 45/44 for undercut articles
• CPC Class Codes: B29L 2031/7544 Injection needles, syringes

Abstract

A syringe and detachable needle assembly having binary attachment features include an elongate syringe barrel having a longitudinal axis, an open proximal end and an open distal end including a collar. The collar includes the cylindrically shaped sidewall having an inside surface and an outside surface. A needle assembly includes the hub having a body portion including a proximal end, a distal end and a conduit therethrough. A cannula having a distal end, a proximal end and a lumen therethrough is attached to the distal end of the hub so that the lumen is in fluid communication with the chamber. A lug is provided on one of the collar and the hub and a ramp and a rest surface is provided on the other of the collar and the hub. The ramp is oriented at an acute angle with respect to longitudinal axis for guiding the lug during needle assembly attachment, to the rest surface forcing the hub to contact the barrel to form a seal the hub and the barrel.

Claims

1. A method of making an elongate syringe barrel for use with a needle assembly having a hub, said hub including a body portion having an outwardly projecting lug and a proximally facing annular surface, said barrel having a longitudinal axis, an outside surface and an inside surface defining a chamber for retaining fluid, an open proximal end, and open distal end including a collar and a distally facing annular surface projecting into said open proximal end, a portion of said collar including a cylindrically shaped sidewall having an inside surface and an outside surface, a ramp and a rest surface projecting inwardly from said inside surface, said ramp oriented at an acute angle with respect to said longitudinal axis for guiding said lug, during needle assembly attachment, to said rest surface forcing said annular surface on said hub to contact said annular surface in said open proximal end of said barrel, to form a seal between said hub and said barrel, said rotation of said hub with respect to said barrel being less than 180°

while said lug travels along said ramp during installation of said needle assembly to said barrel, said method comprising the steps of;

providing an injection mold having a cavity defining a syringe barrel, said mold including a fixed portion defining said outside surface of said barrel, a proximal core pin defining said chamber, a movable split cavity defining said outside surface of said collar and including a raised projection for forming an aperture in said collar and portions of said ramp and said rest surface, and a distal core pin which contacts said raised projection on said movable split cavity when said mold is closed to define remaining portions of said inside surface of said collar;

injecting molten thermoplastic material into said cavity of said mold;

allowing said thermoplastic material to solidify enough to allow movement of said barrel with respect to said mold cavity;

opening said split cavity so that said raised projection is outside of said collar;

removing said proximal core pin and said barrel axially from said fixed portion of said mold without rotation of said distal core pin.

2. The method of claim 1 wherein said thermoplastic material is selected from the group consisting of polypropylene, polyethylene, polycarbonate, PET and combinations thereof.

3. The method of claim 1 wherein said raised projection on said split cavity is configured to cooperate with said distal core pin to form a guide surface running along and spaced from said ramp for guiding said lug during removal of said needle assembly from said barrel.

4. The method of claim 1 wherein said split cavity includes a second projection, and said core pin is configured to cooperate with said second projection to form a second aperture in said collar and a second rest surface.