Syringe plunger rod mount

• US 5,490,842 A
• Filed: 02/16/1995
• Issued: 02/13/1996
• Est. Priority Date: 07/18/1989
• Status: Expired due to Fees

• Current Assignee: Tri/West Systems Incorporated
• Original Assignee: Tri/West Systems Incorporated
• Inventors: Michaels, Thomas, Volk, John F.
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): STRIGHT, RONALD K
• Application Number:
  US08/389,510
• Time in Patent Office: 362 Days
• Field of Search: 604/110, 604/201, 604/226, 604/228, 604/218, 604/222, 604/221, 604/232, 604/263, 604/193, 604/234, 604/227, 604/194, 128/919
• US Class Current: 604/110
• CPC Class Codes: A61M 2005/247 with fixed or steady piercing means, e.g. piercing under movement of ampoule
• CPC Class Codes: A61M 2005/3139 Finger grips not integrally formed with the syringe barrel, e.g. using adapter with finger grips
• CPC Class Codes: A61M 2005/31518 designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members
• 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 5/28 Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle
• CPC Class Codes: A61M 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence
• 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 5/3213 Caps placed axially onto the needle, e.g. equipped with finger protection guards axially-extensible protective sleeves A61M5/3243
• CPC Class Codes: A61M 5/348 snap lock, i.e. upon axial displacement of needle assembly A61M5/344 takes precedence
• CPC Class Codes: A61M 5/50 having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile retractable needles or needle protectors with means for preventing re-use A61M5/321
• CPC Class Codes: A61M 5/5086 for indicating if defective, used, tampered with or unsterile

Abstract

A syringe device has a vial for medicaments having a first open end at a scaled second end. The first end having a plunger tip for sealing the end and has a finger grip means mounted adjacent the first. The needle and hub is slidably mounted on a needle on the second end in axial alignment with the sealed end to position said needle for access to the vial. The plunger rod has a first engagement on one end for engagement with the plunger tip and mounting means for detachably mounting the plunger between the finger grip and the hub to prevent access to the vial when the plunger is mounted thereon.

Claims

1. A syringe device, comprising:

a vial for medicaments having a first open end and a penetratable seal at its opposite second end, said first end having a plunger tip;

finger grip means mounted adjacent said first end;

an elongated hollow plunger rod movable axially in the vial to a final discharge position when medicament is discharged, said hollow plunger rod having a first engagement means on one end for engagement with said plunger tip, said hollow plunger rod having first locking means located adjacent its open end for inserting a spent needle interiorly of the hollow plunger rod;

needle hub means for mounting a needle on said second end in axial alignment with said seal actuatable axially between an unarmed position spaced from said seal and an armed position penetrating said seal to access contents of said vial; and

means defining a cavity and an annular rib in said finger grip means and said hollow plunger rod having a radially outwardly directed disk portion which is sized to snap fit into said cavity behind said rib when said hollow plunger rod is actuated to said final discharge position such that the end of said hollow plunger rod is flush with said finger means grip.

2. A syringe device, comprising:

a vial for medicaments having a first open end and a penetratable seal at its opposite second end, said first end having a plunger tip;

finger grip means mounted adjacent said first end;

needle hub for mounting a needle on said second end in axial alignment with said seal actuatable axially between an unarmed position spaced from said seal and an armed position penetrating said seal to access contents of said vial;

an elongated hollow plunger rod movable axially in the vial to a final discharge position when medicament is discharged, said hollow plunger rod having a first engagement means on one end for engagement with said plunger tip, said hollow plunger rod having first locking means located adjacent its open end and said needle hub means having complementary second locking means whereby a spent needle can be inserted interiorly of the hollow plunger rod and the locking means interengaged to safely hold the spent needle in place in the hollow plunger rod; and

means defining a cavity and an annular rib in said finger grip means and said hollow plunger rod having a radially outwardly directed disk portion which is sized to snap fit into said cavity behind said rib when said hollow plunger rod is actuated to said final discharge position such that the end of said hollow plunger rod is flush with said finger grip means.

3. A syringe device, comprising:

a vial for medicaments having a first open end and a penetratable seal at its opposite second end, said first end having a plunger tip;

finger grip means mounted adjacent said first end;

needle hub for mounting a needle on said second end in axial alignment with said seal actuatable axially between an unarmed position spaced from said seal and an armed position penetrating said seal to access contents of said vial;

an elongated hollow plunger rod movable axially in the vial to a final discharge position when medicament is discharged, said hollow plunger rod having a first engagement means on one end for engagement with said plunger tip, said hollow plunger rod having first locking means located adjacent its open end and said needle hub means having complementary second locking means whereby a spent needle can be inserted interiorly of the hollow plunger rod and the locking means interengaged to safely hold the spent needle in place in the hollow plunger rod; and

means defining a cavity and an annular rib in said finger grip means and said hollow plunger rod having a radially outwardly directed disk portion which is sized to snap fit into said cavity behind said rib when said hollow plunger rod is actuated to said final discharge position such that the end of said hollow plunger rod is flush with said finger grip means.