Passive reuse prevention syringe that uses a flange lock
First Claim
1. A syringe assembly, comprising:
- a syringe barrel having an inside surface defining a chamber, an open proximal end, a distal end, and an outlet disposed adjacent the distal end in fluid communication with the chamber;
plunger assembly disposed at least partially within the syringe barrel, comprising an elongate plunger rod having a proximal end, a distal end, a locking flange formed thereon between the proximal and distal ends, and a plunger head, the plunger rod being engageable with the plunger head such that the plunger rod is adapted to move the plunger head within the chamber of the syringe barrel through an injection cycle; and
a flange lock disposed at the open proximal end of the barrel,wherein the plunger rod has a cylindrical shape defining an outer surface extending from the distal end of the plunger rod to the proximal end of the plunger rod and the locking flange is formed on the outer surface of the plunger rod,wherein the flange lock is integral with the open proximal end of the syringe barrel,wherein during the injection cycle, the flange lock engages the locking flange of the plunger rod so as to prevent removal of the plunger rod from the syringe barrel, andwherein the flange lock includes a plurality of flexible protrusions distributed around a periphery of the open proximal end of the syringe barrel.
1 Assignment
0 Petitions
Accused Products
Abstract
A syringe assembly includes a syringe barrel having an inside surface defining a chamber, an open proximal end, a distal end, and an outlet; a plunger assembly disposed at least partially within the syringe barrel, including an elongate plunger rod having a locking flange formed thereon; and a plunger head having a distal sealing surface, the plunger rod being engageable with the plunger head such that the plunger rod is adapted to move the plunger head within the chamber of the syringe barrel through an injection cycle; and a flange lock disposed at the open proximal end of the barrel. The flange lock is integral with the open proximal end of the syringe barrel. During the injection cycle, the flange lock engages the locking flange of the plunger rod so as to prevent removal of the plunger rod from the syringe barrel.
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Citations
17 Claims
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1. A syringe assembly, comprising:
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a syringe barrel having an inside surface defining a chamber, an open proximal end, a distal end, and an outlet disposed adjacent the distal end in fluid communication with the chamber; plunger assembly disposed at least partially within the syringe barrel, comprising an elongate plunger rod having a proximal end, a distal end, a locking flange formed thereon between the proximal and distal ends, and a plunger head, the plunger rod being engageable with the plunger head such that the plunger rod is adapted to move the plunger head within the chamber of the syringe barrel through an injection cycle; and a flange lock disposed at the open proximal end of the barrel, wherein the plunger rod has a cylindrical shape defining an outer surface extending from the distal end of the plunger rod to the proximal end of the plunger rod and the locking flange is formed on the outer surface of the plunger rod, wherein the flange lock is integral with the open proximal end of the syringe barrel, wherein during the injection cycle, the flange lock engages the locking flange of the plunger rod so as to prevent removal of the plunger rod from the syringe barrel, and wherein the flange lock includes a plurality of flexible protrusions distributed around a periphery of the open proximal end of the syringe barrel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A syringe assembly, comprising:
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a syringe barrel having an inside surface defining a chamber, an open proximal end, a distal end, and an outlet disposed adjacent the distal end in fluid communication with the chamber; a plunger assembly disposed at least partially within the syringe barrel, comprising an elongate plunger rod having, a proximal end, a distal end, a locking flange formed thereon between the proximal and distal ends, and a plunger head, the plunger rod being engageable with the plunger head such that the plunger rod is adapted to move the plunger head within the chamber of the syringe barrel through an injection cycle; and a flange lock disposed at the open proximal end of the barrel, wherein the plunger rod has a cylindrical shape defining an outer surface extending from the distal end of the plunger rod to the proximal end of the plunger rod and the locking flange is formed on the outer surface of the plunger rod, wherein the flange lock is integral with the open proximal end of the syringe barrel, wherein during the injection cycle, the flange lock engages the locking flange of the plunger rod so as to prevent removal of the plunger rod from the syringe barrel, wherein the plunger rod has a variable diameter, and wherein the plunger rod tapers inwardly toward the flange lock.
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9. A syringe assembly, comprising:
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a syringe barrel having an inside surface defining a chamber, an open proximal end, a distal end, and an outlet disposed adjacent the distal end in fluid communication with the chamber; a plunger assembly disposed at least partially within the syringe barrel, comprising an elongate plunger rod having a proximal end, a distal end, a locking flange formed thereon between the proximal and distal ends, and a plunger head, the plunger rod being engageable with the plunger head such that the plunger rod is adapted to move the plunger head within the chamber of the syringe barrel through an injection cycle; and a flange lock disposed at the open proximal end of the barrel, wherein the plunger rod has a cylindrical shape defining an outer surface extending from the distal end of the plunger rod to the proximal end of the plunger rod and the locking flange is formed on the outer surface of the plunger rod, wherein the flange lock is integral with the open proximal end of the syringe barrel, wherein during the injection cycle, the flange lock engages the locking flange of the plunger rod so as to prevent removal of the plunger rod from the syringe barrel, and wherein the plunger head further comprises; a distal wall, the distal wall having a distal sealing surface defined thereon; a proximal wall, spaced from the distal wall; and a central portion extending between the distal wall and the proximal wall, the central portion having a cylindrical core portion and a plurality of fin portions extending radially from the cylindrical core portion, and wherein the distal wall of the plunger head perimetrically engages the inner surface of the barrel so as to seal the chamber of the barrel.
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10. A syringe assembly, comprising:
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a syringe barrel having an inside surface defining a chamber, an open proximal end, a distal end, and an outlet disposed adjacent the distal end in fluid communication with the chamber; a plunger assembly disposed at least partially within the syringe barrel, comprising an elongate plunger rod having a proximal end, a distal end, a locking flange formed thereon between the proximal and distal ends, and a plunger head, the plunger rod being engageable with the plunger head such that the plunger rod is adapted to move the plunger head within the chamber of the syringe barrel through an injection cycle; and a flange lock disposed at the open proximal end of the barrel, wherein the plunger rod has a cylindrical shape defining an outer surface extending from the distal end of the plunger rod to the proximal end of the end plunger rod and the locking flange is formed on the outer surface of the plunger rod, wherein the flange lock is integral with the open proximal end of the syringe barrel, wherein during the injection cycle, the flange lock engages the locking flange of the plunger rod so as to prevent removal of the plunger rod from the syringe barrel, wherein the distal end of the plunger rod is slidably connected to the plunger head, wherein the plunger head includes a cylindrical connecting portion extending from a proximal wall of the plunger head, the cylindrical connecting portion having an annular lip at a proximal end thereof, the plunger rod has a hollow cylindrical shape defining an outer surface and an inner diameter, the inner diameter of the plunger rod having an internal annular ring adapted to engage the annular lip of the cylindrical connecting portion such that the internal annular ring of the plunger rod is able to slide over the annular lip in the distal direction and retain the annular lip of the cylindrical connecting portion within the plunger rod, and the plunger rod slides with respect to the cylindrical connecting portion of the plunger head such that the internal annular ring of the plunger rod engages the annular lip of the cylindrical connecting portion during aspiration and the distal end of the plunger rod engages the proximal wall of the plunger head during injection. - View Dependent Claims (11, 12)
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13. A plunger assembly for a syringe, the plunger assembly comprising:
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an elongate plunger rod having a proximal end, a distal end, and a locking flange formed thereon between the proximal and distal ends; and a plunger head, the plunger head including a cylindrical connecting portion, wherein the plunger rod is engageable with the plunger head such that the plunger rod is adapted to move the plunger head within the chamber of as ne barrel through an injection cycle, wherein the distal end of the plunger rod is slidably connected to the plunger head, wherein during the injection cycle, the locking flange of the plunger rod is configured to engage a flange lock on the syringe so as to prevent removal of the plunger rod from the syringe barrel, wherein the plunger rod has a hollow cylindrical shape defining an outer surface and an inner diameter, and the cylindrical connecting portion of the plunger head fits within the inner diameter of the plunger rod, and wherein the plunger head further comprises; a distal wall, the distal wall having a distal sealing surface defined thereon; a proximal wall, spaced from the distal wall; and a central portion extending between the distal wall and the proximal wall, the central portion having a cylindrical core portion and a plurality of fin portions extending radially from the cylindrical core portion, wherein the distal wall of the plunger head is configured to perimetrically engage an inner surface of the syringe barrel so as to seal a chamber of the syringe barrel. - View Dependent Claims (14, 15)
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16. A plunger assembly for a syringe, the plunger assembly comprising:
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an elongate plunger rod having a proximal end, a distal end, and a locking flange formed thereon between the proximal and distal ends; and a plunger head, the plunger head including a cylindrical connecting portion, wherein the plunger rod is engageable with the plunger head such that the plunger rod is adapted to move the plunger head within the chamber of a syringe barrel through an injection cycle, wherein the distal end of the plunger rod is slidably connected to the plunger head, wherein during the injection cycle, the locking flange of the plunger rod is configured to engage a flange lock on the syringe so as to prevent removal of the plunger from the syringe barrel, wherein the plunger rod has a hollow cylindrical shape defining an outer surface and an inner diameter, and the cylindrical connecting portion of the plunger head fits within the inner diameter of the plunger rod, and wherein the cylindrical connecting portion of the plunger head extends from a proximal wall of the plunger head and has an annular lip at a proximal end thereof, the inner diameter of the plunger rod has an internal annular ring adapted to engage the annular lip of the cylindrical connecting portion such that the internal annular ring of the plunger rod is able to slide over the annular lip in the distal direction and retain the annular lip of the cylindrical connecting portion within the plunger rod, and the plunger rod slides with respect to the cylindrical connecting portion of the plunger head such that the internal annular ring of the plunger rod engages the annular lip of the cylindrical connecting portion during aspiration and the distal end of the plunger rod engages the proximal wall of the plunger head during injection. - View Dependent Claims (17)
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Specification