Bone cement mixing device
AssigneeSummit Medical Limited
InventorPeter Seddon
Life of this patent
Estimating the term…
Abstract
An orthopaedic bone cement mixing device comprising a mixing bowl (1) and a lid (3), said lid (3) having a handle (4) extending outwardly therefrom. A mixing paddle (7) comprising a shaft (8) and vanes (9) extending outwardly therefrom extends into the bowl (1) from the lid (3) and is anchored in a groove (10) running around the base (2) of the bowl. A step-up gear mechanism (5, 11) is provided between the paddle (7) and the lid (3) such that, as the handle (4) is rotated the lid (3) rotates, causing the paddle (7) to rotate around the bowl (1). The drive wheel (5) of the gear mechanism is also caused to rotate and drives the driven wheel (11) which causes the shaft (8) of the paddle (7) to rotate about its own axis as the paddle (7) moves around the bowl (1).
Claims14
Apparatus for manually mixing bone cement comprising means defining a hermetically sealable mixing chamber, said chamber defining means including a wall and a base, means for evacuating said chamber, said evacuating means including a port in said wall of said chamber for connection to a vacuum source to enable a vacuum to be created in said chamber, a mixing paddle extending into said chamber, said paddle defining a paddle axis of rotation, and drive means for said paddle, said drive means including a rotatable handle and gear means for coupling said handle to said paddle, rotation of said handle causing said paddle to rotate about said paddle axis and also causing simultaneous displacement of said paddle axis within said chamber whereby said paddle is moved around substantially the entire region of the interior of said chamber where the constituents of a bone cement will be located.
A mixing system for bone cement comprising means defining an enclosed mixing chamber, a vacuum pump, said vacuum pump communicating with said chamber for removing air from the chamber, and means for mixing the constituents of a bone cement which are delivered into said chamber, said mixing means comprising a mixing paddle, said mixing paddle defining a paddle axis of rotation, said mixing means also comprising means for manually causing rotation of said paddle about said paddle axis and simultaneously causing movement of said paddle axis within said chamber.
Dependencies are inferred from the claim text.