Self-aligning plunger rod

Details Self-aligning plunger rod Self-aligning plunger rod

2000-03-17

2000-11-07

Kennedy, Sharon

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

A61M 5315

Patent

active

061429783

ABSTRACT:
A self-aligning reinforced plunger rod and a non-elastomeric plastic plunger insert assembly for use with an elastomeric plunger in a cartridge or syringe barrel, the plunger rod having a first, second, third and fourth sides, a distal end with an end disc, a proximal end with a thumb rest, and a plunger rod tip integral with the end disc and having a neck portion and a ball portion for engagement with a cavity in the non-elastomeric plastic plunger insert. Connecting the end disc and thumb rest there are: four longitudinal radially extending rectangular vanes spaced about 90.degree. from each other; on the first side of the plunger rod a first pair of longitudinal radially extending reinforcing vanes, and a second pair of longitudinal radially extending reinforcing vanes; on the third side opposite to the first side of the plunger rod, a first pair of longitudinal radially extending reinforcing vanes, and a second pair of longitudinal radially extending reinforcing vanes; each of the first pair and each of the second pair of longitudinal radially extending reinforcing vanes on the first side of the plunger rod and each of the first pair and each of the second pair of the longitudinal radially extending reinforcing vanes on the third side of the plunger rod forms an obtuse triangle with one of the longitudinal radially extending reinforcing vanes; on the second side of the plunger rod, a first pair of longitudinal radially extending reinforcing vanes forms a two-dimensional hourglass-shaped surface, and on the fourth side of the plunger rod, a second pair of longitudinal radially extending reinforcing vanes forms a two-dimensional hourglass-shaped surface. The non-elastomeric plastic plunger insert contains a cavity defined by its inside surface to receive the plunger rod tip. The combination directs the force exerted on the plunger rod in an axial direction.

REFERENCES:
patent: 4543093 (1985-09-01), Christinger
patent: 4840616 (1989-06-01), Banks
patent: 4890626 (1990-01-01), Wang
patent: 5215536 (1993-06-01), Lampropoulos et al.
patent: 5222942 (1993-06-01), Bader
patent: 5358497 (1994-10-01), Dorsey et al.
patent: 5485853 (1996-01-01), Stubbs
patent: 5700247 (1997-12-01), Grimard et al.
patent: 6030367 (2000-02-01), Balestracci

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