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AssigneeZimmer, Inc.
InventorsRebecca Gibbs, Jan J. Krygier, Joseph E. Miller, deceased, by L. A. Desrochers, executor, by Bryan O'Donnell, executor, by Patricia Miller, executor
Estimating the term…
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.
A feeding device for delivering a low viscosity paste material under pressure comprising a housing adapted to engage the end of a cartridge from which the low viscosity paste material can be dispensed, a plunger including a rod adapted to slide axially of the housing for engagement within the cartridge, the rod being provided with an axially extending series of notches forming teeth and the notches being discontinuous at least in a circumferential segment of the rod leaving a smooth axial rod surface segment) an annular ratchet cylinder slidable within the housing, the ratchet cylinder including a bore through which the rod is to pass, a pistol grip extending from the housing at an angle to the axis of the housing, and a lever pivotally mounted to the pistol grip with the lever extending beyond the pivot point thereof to engage the ratchet cylinder, the ratchet cylinder including a pawl pivotally mounted therein and being spring biased to engage the series of teeth on the rod in order to advance the plunger.
Dependencies are inferred from the claim text.