US 6,994,465 B2Granted

Mixing assembly for mixing bone cement

AssigneeStryker Instruments

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

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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.

Claims64

Dependent claims

A mixing assembly for mixing bone cement, said mixing assembly comprising:

a housing having at least one interior wall;
a lid removably attachable to said housing and movable between an open position where the bone cement can be added to said housing and a sealed position where said lid is hermetically sealed to said housing to define a sealed mixing chamber between said lid and said interior wall of said housing for mixing the bone cement;
a handle having a portion extending through said lid and being rotatable about said lid for mixing the bone cement;
a mixing paddle operatively coupled to said portion of said handle for rotating with said portion wherein said mixing paddle is movable between an extended position when said lid is in said open position and a retracted position where said mixing paddle is adapted to scrape the bone cement from said interior wall when said lid is in said sealed position;
and
a resilient member disposed between said portion and said mixing paddle, said resilient member normally-biasing said mixing paddle into said extended position and said resilient member compressing in response to contact between said mixing paddle and said interior wall as said lid is moved from said open position to said sealed position thereby permitting said mixing paddle to retract into said retracted position such that said lid can be hermetically sealed to said housing in said sealed position, yet said mixing paddle can still scrape the bone cement from said interior wall.

3 more elements

A mixing assembly for mixing bone cement, said mixing assembly comprising:

a housing having at least one interior wall;
a lid removably attachable to said housing;
a handle having a portion extending through said lid and being rotatable in a first rotational direction;
a first mixing paddle operatively coupled to said portion of said handle and having a first fixed axis of rotation, said first mixing paddle rotating with said portion in said first rotational direction about said first fixed axis of rotation;
a second mixing paddle having a second fixed axis of rotation that is different from said first fixed axis of rotation of said first mixing paddle;
a gear set disposed between said first and second mixing paddles to operatively couple said second mixing paddle to said first mixing paddle such that said second mixing paddle rotates opposite said portion in a second rotational direction, opposite said first rotational direction, and about said second fixed axis of rotation when said portion and said first mixing paddle rotate in said first rotational direction wherein said gear set includes a first gear associated with said first mixing paddle and a second gear associated with said second mixing paddle, with said first gear mating with said second gear to rotate said second mixing paddle in said second rotational direction when said portion and said first mixing paddle rotate in said first rotational direction;
and
a first sleeve defined within and extending entirely through said lid for supporting said portion of said handle.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/388,015Filed 13 Mar 2003 · us provisional application
Priority: 14 Mar 2002
Published: US 2003/0174576 A118 Sep 2003
Granted: 7 Feb 2006
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