Hypodermic syringe barrel and needle structure

Claim 2

A hypodermic syringe barrel and needle structure comprising a one-piece molded plastic syringe barrel having a substantially uniform internal diameter, a base and an integrally molded tubular extension projecting outwardly from said base, said extension including means defining a frangible portion outwards of the base, and an internal surface including portions shaped to define a cannula accommodating bore portion and an outwardly flaring bore portion outwards of said cannula accommodating bore portion, a separately molded plastic cap member shaped to fit on said extension and spaced from said base of said barrel, said cap member having an inwardly directed flange at its outer end, means bonding said cap member to said extension, a cannula inserted within said extension in abutting contact with at least a portion of one of said bore portions of said extension, and a bonding composition disposed in surrounding relationship to said cannula in intimate engagement with and bonded to the outer surface thereof, said bonding composition at least substantially filling the space between said cannula and the surrounding bore portion and the inner surface of said inwardly directed flange to retain said cannula in fixed relation relative to said extension and cap member.

Claim 3

A hypodermic syringe barrel and needle structure as claimed in claim 1 and said inner surface of said inwardly directed flange on said cap member facing said outwardly flaring bore portion and including a surface portion that extends laterally outwards of the outer terminal end of said outwardly flaring bore portion.

Claim 4

A hypodermic syringe barrel and needle strucure as claimed in claim 1 in which said integral tubular extension of said plastic barrel member and said cap member have facing bonding surfaces.

Claim 5

A hypodermic syringe barrel and needle structure as claimed in claim 3 and the means bonding said cap member to said tubular extension comprising a sonically welded connection located at least at said facing bonding surfaces so that said cap member is effectively integrally combined with said tubular extension.

Claim 6

A hypodermic syringe barrel and needle structure as claimed in claim 4 and the bonding surface of said tubular extension comprising a laterally directed external shoulder surface located outwards of said frangible portion of said extension and the bonding surface of said cap member comprising a laterally directed external flange surface at the inner end of said cap member.

Claim 7

A hypodermic syringe barrel and needle structure as claimed in claim 5 and a pointed sonic energy directing means provided on and integral with one of said bonding surfaces.

Claim 8

A hypodermic syringe barrel and needle structure as claimed in claim 6 and said pointed sonic energy directing means comprising a pointed annular bead extending from the laterally directed flange surface at the inner end of said cap member.

Claim 9

A hypodermic syringe barrel and needle structure comprising a molded polypropylene syringe barrel having a base and an integral tubular extension projecting outwardly of said base, said extension including a first portion extending outwardly of said base and constituting a frangible portion for separating the extension from said barrel member, said frangible portion being defined between a first annular shoulder constituting a portion of said base and a second annular shoulder formed on the inner surface of said tubular extension, said shoulders being longitudinally offset from one another, said tubular extension having an external shoulder longitudinally offset from said second annular shoulder and constituting a bonding face, said tubular extension having an outer wall surface extending beyond said external shoulder and including a first surface portion that is cylindrical and a second surface portion extending from and beyond said first surFace portion and tapering inwardly to a terminal annular end surface on said exension, said extension having an inner bore surface that tapers inwardly to and merges with a transversely extending surface that in turn merges with a frusto-conically shaped portion formed with said tubular extension and that projects rearwardly into said bore, said frusto-conically shaped portion having a bore therethrough including a first, cylindrical surface portion for accommodating a cannula and an adjoining outwardly flaring surface portion that extends to said terminal annular end surface of said extension, a separately molded polypropylene cap member having an external flange at its inner end constituting a bonding surface and an internal flange at its outer end, said internal flange defining an opening substantially larger than the transverse dimensions of any cannula to be inserted therethrough, said cap member having an internal surface including joined portions complementary with said first and second surface portions of the outer wall surface of said extension, said external flange at the inner end of said cap member having a pointed bead means of the plastic material of said cap member constituting an energy director, said cap member being sonically welded via said bonding surface and energy director thereon to said bonding face on said extension to integrally unite the cap member and extension, the longitudinal distance between said bonding surface of said external flange and the inner surface of said internal flange on said cap member being greater than the longitudinal distance between said external shoulder and said end surface of said extension so that said internal flange on said cap member is spaced outwardly of said end surface of said extension, a cannula extending through the opening defined by said internal flange and operatively positioned relative to the bore surface of said frusto-conically shaped portion of said extension and said outwardly flaring bore surface portion, and a bonding material composition set within said integrally united extension and cap member in surrounding relation to said cannula and including an annular set portion of said composition extending between said end surface of said extension and the inner surface of said internal flange whereby said cannula is maintained in permanently fixed operative relation.

Claim 10

A hypodermic syringe barrel and needle structure comprising a molded polypropylene syringe barrel having a base and an integral tubular extension projecting outwardly of said base, said extension including a first portion extending outwardly of said base and constituting a frangible portion for separating the extension from said barrel member, said frangible portion being defined between a first annular shoulder constituting a portion of said base and a second annular shoulder formed on the inner surface of said tubular extension, said shoulders being longitudinally offset from one another, said tubular extension having an external shoulder longitudinally offset from said second annular shoulder and constituting a bonding face, said tubular extension having an outer wall surface extending beyond said external shoulder and including a first surface portion that is cylindrical and a second surface portion extending from and beyond said first surFace portion and tapering inwardly to a terminal annular end surface on said exension, said extension having an inner bore surface that tapers inwardly to and merges with a transversely extending surface that in turn merges with a frusto-conically shaped portion formed with said tubular extension and that projects rearwardly into said bore, said frusto-conically shaped portion having a bore therethrough including a first, cylindrical surface portion for accommodating a cannula and an adjoining outwardly flaring surface portion that extends to said terminal annular end surface of said extension, a separately molded polypropylene cap member having an external flange at its inner end constituting a bonding surface and an internal flange at its outer end, said internal flange defining an opening substantially larger than the transverse dimensions of any cannula to be inserted therethrough, said cap member having an internal surface including joined portions complementary with said first and second surface portions of the outer wall surface of said extension, said external flange at the inner end of said cap member having a pointed bead means of the plastic material of said cap member constituting an energy director, said cap member being sonically welded via said bonding surface and energy director thereon to said bonding face on said extension to integrally unite the cap member and extension, the longitudinal distance between said bonding surface of said external flange and the inner surface of said internal flange on said cap member being greater than the longitudinal distance between said external shoulder and said end surface of said extension so that said internal flange on said cap member is spaced outwardly of said end surface of said extension, a cannula extending through the opening defined by said internal flange and operatively positioned relative to the bore surface of said frusto-conically shaped portion of said extension and said outwardly flaring bore surface portion, and a bonding material composition set within said integrally united extension and cap member in surrounding relation to said cannula and including an annular set portion of said composition extending between said end surface of said extension and the inner surface of said internal flange whereby said cannula is maintained in permanently fixed operative relation.

Claim 11

A hypodermic syringe barrel and needle structure as claimed in claim 3 in which one of said facing bonding surfaces includes a circumferentially extending bead and the other bonding surface includes a cooperating circumferential groove to retain said cap member in position on said tubular extension.