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US 6,484,954 B2Granted
Method and device for surgical bone grinding
AssigneeLenox-MacLaren Surgical Corp.
InventorLinda Lenox
Life of this patent
Estimating the term…
Abstract
A method and apparatus for grinding bone for use in orthopaedic procedures includes a bone shoot for receiving bone segments which are fed into a grinding assembly rotatable about an axis such that a plurality of cutting plates rotate about such axis to grind bone into uniform and desirable sized portions suitable for use in cementing of bone implants.
Claims34
A bone grinder, comprising:
- a housing having a bone chute therethrough and a chamber intersecting said bone chute, wherein said bone chute has a bone segment entry portion for receiving bone segments, and an exit opening for exiting bone fragments of a predetermined size produced from said received bone segments;
- a grinding assembly provided in said chamber, said grinding assembly rotatable about an axis traversing an extent of said bone chute, wherein said grinding assembly includes:
- (a) a shaft rotatable about said axis, and
- (b) a plurality of cutting plates, each plate having opposed first and second sides, a corresponding thickness therebetween and an opening through said thickness of the plates between said opposed sides for matingly receiving said shaft, and at least one cutting edge between said opposed sides for fragmenting said bone segments within said entry portion when said cutting plate rotates with said shaft;
- wherein at least two of said cutting plates are adjacent on said shaft so that for said adjacent cutting plates:
- (c) said at least one cutting edge on each of said adjacent cutting plates have contiguous cutting paths, and,
- (d) said at least one cutting edge on both of said adjacent cutting plates are oriented in a same direction for fragmenting said bone segments.
4 more elements
A bone grinder, comprising:
- a bone chute having an entry portion for receiving bone segments, and an exit opening for exiting bone fragments of a preferred size produced from said received bone segments;
- a grinding assembly provided in said chamber, said grinding assembly rotatable about an axis traversing an extent of said bone chute, wherein said grinding assembly includes:
- (a) a shaft rotatable about said axis, and
- (b) at least one cutting plate having a rim with a plurality of cutting edges thereon for cutting fragments of said bone segments within said entry portion when said at least one cutting plate rotates with said shaft;
- wherein for a consecutive two of said cutting edges, E1 and E2, there is a leading face (L2) for E2 therebetween, wherein L2 is contiguous to E2, and L2 leads E2 when said cutting plate rotates for grinding;
- and
- wherein the following conditions (i) through (iv) hold:
- (i) L2 is non-convex, and includes a concave portion of said rim, wherein said concave portion is contiguous to E2;
- (ii) substantially all of L2 is on a side, S, of a radius from a center of said cutting plate to E2, wherein S leads E2 when said cutting plate rotates for grinding;
- (iii) for C being a maximal non-concave curvature of said rim between E1 and L2, and for a portion P on said rim between E1 and L2, wherein said rim has said maximal non-concave curvature C at P, then from P to E1, said rim has no concave portion that has a curvature greater than or equal to C;
- (iv) said curvature C is less than a curvature of said concave portion of L2.
8 more elements
A bone grinder, comprising:
- a housing having a bone chute therethrough and a chamber intersecting said bone chute, wherein said bone chute has a bone segment entry portion for receiving bone segments, and an exit opening for exiting bone fragments of a predetermined size produced from said received bone segments;
- a grinding assembly provided in said chamber, said grinding assembly rotatable about an axis traversing an extent of said bone chute, wherein said grinding assembly includes:
- (a) a shaft rotatable about said axis, and
- (b) a plurality of cutting plates, each plate having opposed first and second sides, a corresponding thickness therebetween and an opening through said thickness of the plates between said opposed sides for matingly receiving said shaft, and at least one cutting edge between said opposed sides for fragmenting said bone segments within said entry portion when said cutting plate rotates with said shaft;
- wherein at least two of said cutting plates are adjacent on said shaft so that for said adjacent cutting plates
- (c) said at least one cutting edge on each of said adjacent cutting plates provides a contiguous cutting path with said at least one cutting edge on the other of said adjacent cutting plates, and, and
- (d) said at least one cutting edge on both of said adjacent cutting plates are oriented in a same direction for fragmenting said bone segments.
4 more elements
A method for grinding bone, comprising:
- providing a housing having a bone chute therethrough and a chamber intersecting said bone chute, wherein said bone chute has a bone segment entry portion for receiving bone segments, and an exit opening for exiting bone fragments of a predetermined size produced from said received bone segments;
- providing a grinding assembly provided in said chamber, said grinding assembly rotatable about an axis traversing an extent of said bone chute, wherein said grinding assembly includes:
- (a) a shaft rotatable about said axis, and
- (b) a plurality of cutting plates, each plate having opposed first and second sides, a corresponding thickness therebetween and an opening through said thickness of the plates between said opposed sides for matingly receiving said shaft, and at least one cutting edge between said opposed sides for fragmenting said bone segments within said entry portion when said cutting plate rotates with said shaft;
- wherein at least two of said cutting plates are adjacent on said shaft so that for said adjacent cutting plates:
- (c) said at least one cutting edge on each of said adjacent cutting plates have contiguous cutting paths in said bone chute;
- (d) said at least one cutting edge on both of said adjacent cutting plates are oriented in a same direction for fragmenting said bone segments;
- and
- (e) grinding bone by placing said bone segments in said bone chute.
6 more elements
Dependencies are inferred from the claim text.