US 7,677,418 B2Granted

Bone cement cartridge with a releasably locked drive piston, the piston configured to be unlocked by a delivery device

AssigneeStryker Corporation

InventorsBruce D. Henniges, Jared P. Coffeen

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Abstract

A bone cement mixing and delivery system is provided. The system includes a mixing cartridge for receiving liquid and powder components of bone cement, a mixing blade for mixing the components, and a delivery gun for discharging the bone cement from the mixing cartridge. The mixing cartridge comprises a cylinder having proximal and distal ends with a cylinder wall extending between the ends. A piston is locked at the distal end by a locking member that includes a pair of locking tabs protruding into slots in the cylinder wall. With the piston in the locked position, the mixing blade mixes the components. After mixing, the cartridge is placed in the delivery gun and release buttons on the locking member are engaged by a release mechanism on the delivery gun to release the piston from the locked position.

Claims20

Dependent claims

A cartridge in which bone cement is mixed and from which bone cement is discharged, said cartridge including:

a sleeve having opposed proximal and distal ends and that defines a mixing chamber that extends between the ends;
a cap separate from said sleeve that is releasably secured over the proximal end of said sleeve, said cap having an orifice that opens into the sleeve mixing chamber;
a piston slidably disposed in the sleeve mixing chamber, said piston having an outer perimeter;
at least one lock tab separate from and slidably mounted to said piston so as to move from a locked state in which said at least one lock tab engages said sleeve to prevent proximal movement of said piston through the sleeve mixing chamber and a release state in which said at least one lock tab is spaced away from said sleeve so as to allow proximal movement of said piston through the sleeve mixing chamber;
and
a release button integral with said at least one lock tab and located inwardly from the piston outer perimeter, said release button having a feature shaped to be engaged by a ram such that when the release button is so engaged and the ram is moved toward said piston, said release button undergoes a displacement that moves said at least one lock tab from the locked state to the release state.

3 more elements

A cartridge in which bone cement is mixed and from which bone cement is discharged, said cartridge including:

a sleeve having opposed proximal and distal ends and that defines a mixing chamber that extends between the sleeve ends;
a cap separate from said sleeve that is releasably secured over the proximal end of said sleeve, said cap having an orifice that opens into the sleeve mixing chamber;
a piston slidably disposed in the sleeve mixing chamber, said piston having:
a proximal face that is directed towards the sleeve proximal end;
a distal end opposite the proximal face;
and a closed-end bore that extend inwardly from the distal end towards the proximal face;
at least one tab separate from and slidably mounted to said piston so as to move from a locked state in which said at least one tab engages said sleeve to prevent movement of said piston through the sleeve mixing chamber and a release state in which said at least one tab is spaced away from said sleeve so as to allow movement of said piston through the sleeve mixing chamber;
and
a release button integral with said at least one tab that is located inwardly of said sleeve and outwardly of the piston bore, said release button having a feature shaped to be engaged by a release member such that when the release button is so engaged and the release member is actuated, said release button undergoes a displacement that moves said at least one tab from the locked state to the release state.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/138,620Filed 13 Jun 2008 · division
Priority: 12 May 2003
Published: US 2008/0025140 A19 Oct 2008
Granted: 16 Mar 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

A61B 17/8822
For introducing fluid filler into bone or extracting it: characterised by means facilitating expulsion of fluid from the introducer, e.g. a screw…
A61B 17/8827
For introducing fluid filler into bone or extracting it: with filtering, degassing, venting or pressure relief means
B01F 31/40
Mixers with shaking, oscillating, or vibrating mechanisms: with an axially oscillating rotary stirrer
B01F 33/5011
Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use: portable during use, e.g. hand-held

Family

Application60/469,651Us provisional application · filed 12 May 2003
Application60/520,877Us provisional application · filed 18 Nov 2003
Application10/843,813Parent of this division · filed 12 May 2004
Application11/837,649Parent of this division · filed 13 Aug 2007
US 2008/0247262 A1Pre-grant publication · published 9 Oct 2008
US 7,393,342 B2Parent of this division
US 2004/0267272 A1Published application
US 2008/0025140 A1Published application
US 7,677,418 B2This patent

From the US filing history. Foreign family members aren’t listed.