Rebecca A Gibbs

US Patent:

49940651, Feb 19, 1991

Filed:

May 18, 1990

Appl. No.:

7/524793

Inventors:

Rebecca Gibbs - Carrboro NC
Jan J. Krygier - St. Constant, CA
Joseph E. Miller - late of Carrboro NC
by L. A. Desrochers - Edmonton, CA
by Bryan O'Donnell - Edmonton, CA
by Patricia Miller - Westmount, CA

Assignee:

Zimmer, Inc. - Warsaw IN

International Classification:

A61F 504

US Classification:

606 92

Abstract:

An injection gun especially useful for injecting low volume, high pressure shots of bone cement. The gun includes a cylindrical housing with a plunger including a plunger rod extending axially through the housing. The plunger rod includes a segment which is provided with an axial series of notches. A ratchet block is slidable axially within the cylindrical housing and is concentric with the plunger rod. The ratchet cylinder mounts at least a ratchet pawl urged against the plunger rod and adapted to engage and lock into the series of notches for forward movement. A pistol grip extends from the cylindrical housing, and a lever is pivoted thereto with an extension of the lever engaging the ratchet cylinder for advancing the plunger. A second ratchet pawl is mounted on a fixed member of the cylindrical housing for retaining the plunger against rearward movement when the pawl in the ratchet cylinder is disengaged from the rod.