US 7,967,499 B2Granted

Bone cement mixer with two paddles, the paddles arranged to limit longitudinal movement

AssigneeStryker Corporation

InventorsChristopher Matthew Tague, Richard F. Huyser, Jared Paul Coffeen, Christopher Scott Brockman

Life of this patent

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Abstract

A mixing assembly for mixing bone cement includes a housing, a lid, a handle, and two mixing paddles, a first and a second mixing paddle. The lid is removably attachable to the housing. The handle has a portion that extends through the lid and that is rotatable in a first rotational direction. The first mixing paddle is operatively coupled to the portion of the handle. As a result, the first mixing paddle rotates with the portion of the handle in the first rotational direction. The second mixing paddle is operatively coupled to the first mixing paddle for rotating opposite the portion. As such, when the portion of the handle and the first mixing paddle rotate in the first rotational direction, the second mixing paddle rotates in a second rotational direction that is opposite the first rotational direction.

Claims20

Dependent claims

A mixer for mixing bone cement, said mixer including:

a housing including a bottom surface and a side wall that extends upwardly from and circumferentially around said bottom surface, said side wall defining an open top of said housing;
a lid removably attachable to said top of said housing;
a first paddle disposed in said housing, said first paddle including:
a shaft that is rotatably mounted to said lid and able to move longitudinally relative to said lid;
and at least one vane that extends from said first paddle shaft so to be located adjacent said bottom surface of said housing;
a second paddle disposed in said housing, said second mixing paddle including:
a shaft that is rotatably mounted to said lid and able to move longitudinally relative to said lid;
a vane that extends from said second paddle shaft and is located above said at least one vane of said first paddle;
and a head that extends around said second paddle shaft and is positioned to extend over and abut a component of said first paddle so as to limit movement of said second paddle vane towards said first paddle at least one vane;
at least one biasing member that extends between said lid and said paddles for urging said paddles downwardly so that said first paddle at least one vane is urged toward said housing bottom surface and said second paddle vane is urged towards said first paddle at least one vane;
and
a handle connected to said paddles for simultaneously rotating said paddles.

9 more elements

A bone cement mixer, said mixer including:

a housing having a bottom surface from which a side wall circumferentially extends upwardly so as to define an open end of said housing;
a lid shaped to seat over said open end of said housing and be removably attachable to said housing;
a first paddle, said first paddle having:
a shaft that is rotatably mounted to said lid that extends towards said housing bottom surface and is further mounted to said lid to move longitudinally relative to said lid;
a gear that extends around and is integral with said shaft;
a flange that extends outwardly from and circumferentially around said shaft, said flange being located below said first paddle gear;
and at least one vane that extends from said shaft that is located adjacent said bottom surface of said housing;
a second paddle, said second paddle having:
a shaft that is rotatably mounted to said lid that extends towards said housing bottom surface and is further mounted to said lid to move longitudinally relative to said lid, a gear that extends around and is integral with said shaft, said second paddle gear configured to cooperate with said first paddle gear so as to cause simultaneous rotation of said first paddle shaft and said second paddle shaft;
and a vane that extends outwardly from said shaft that is located above said first paddle at least one vane, wherein said second paddle gear is further positioned to extend at least partially over and abut said first paddle flange so that the abutment of said second paddle gear against said first paddle flange limits longitudinal movement of said second paddle vane towards said first paddle at least one vane;
a biasing assembly that extends between said lid and said paddles that urges said paddles downwardly so that said vanes of said first and second paddles are urged towards said housing bottom surface;
and
a handle rotatably mounted to said lid outside of said housing that is connected to paddles for rotating said paddles.

10 more elements

A bone cement mixer, said mixer including:

a housing, said housing shaped to define a bottom surface;
a side wall that extends upwardly and circumferentially around said bottom surface to define an open top;
and a depression formed in and that extends downwardly from said bottom surface;
a lid removably attachable to said open top of said housing;
a first paddle disposed in said housing, said first paddle including:
a shaft that is mounted to said lid so as to be able to rotate and move longitudinally relative to said lid;
a tip that extends from an end of said first paddle shaft distal to said lid, said tip shaped to seat in said housing depression;
and a first vane that extends outwardly from said shaft, said first vane being located above said shaft tip;
a second paddle disposed in said housing, said second paddle including:
a shaft that is mounted to said lid so as to be able to rotate and move longitudinally relative to said lid;
a vane that extends from said second paddle shaft is located above said first paddle first vane;
and a head that extends around said second paddle shaft and is positioned to abut a component of said first paddle so as to limit movement of said second paddle vane towards said first paddle first vane;
a handle rotatably mounted to said lid that is connected said paddles for simultaneously rotating said paddles;
and
a biasing assembly that extends between said lid and said paddle shafts for urging said paddle shafts away from said lid so that;
said first paddle shaft tip is urged into said housing depression;
said first paddle first vane is pressed against said housing bottom surface;
and said second paddle vane is urged towards said first paddle vane.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/686,146Filed 12 Jan 2010 · division
Priority: 14 Mar 2002
Published: US 2010/0124143 A120 May 2010
Granted: 28 Jun 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

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
B01F 27/85
With stirrers rotating about a substantially vertical axis: with two or more stirrers on separate shafts
B01F 33/5014
Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use: movable by human force, e.g.…
A61F 2002/302
Three-dimensional shapes: toroidal, e.g. rings

Family

Application60/364,171Us provisional application · filed 14 Mar 2002
Application10/388,015Parent of this division · filed 13 Mar 2003
Application11/301,177Parent of this division · filed 12 Dec 2005
US 6,994,465 B2Parent of this division · filed 7 Feb 2006
US 7,645,066 B2Parent of this division · filed 12 Jan 2010
US 2010/0124143 A1Pre-grant publication · published 20 May 2010
US 2003/0174576 A1Published application
US 2006/0087912 A1Published application
US 7,967,499 B2This patent

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