Surgical saw blade

• US 5,423,845 A
• Filed: 03/10/1994
• Issued: 06/13/1995
• Est. Priority Date: 03/07/1991
• Status: Expired due to Term

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: McDaniel, John M.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US08/212,393
• Time in Patent Office: 460 Days
• Field of Search: 606/176, 606/177, 606/82, 606/178, 30/355, 83/835, 83/846, 83/848, 83/851
• US Class Current: 606/176
• CPC Class Codes: A61B 17/14 Surgical saws A61B17/1637 takes precedence; tooth saws A61C3/12 ; Accessories therefor
• CPC Class Codes: A61B 17/142 with reciprocating saw blades, e.g. with cutting edges at the distal end of the saw blades
• CPC Class Codes: B23D 61/121 Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor
• CPC Class Codes: Y10T 83/935 Plural tooth groups

Abstract

A blade for a surgical saw has an elongate body with distal and proximal ends, and a plurality of teeth formed on an outwardly facing edge surface of the distal end. The spaces between adjacent teeth are defined by surfaces which lie in planes which are non-perpendicular to the substantially flat surfaces which define the body of the blade. These non-perpendicular surfaces guide cuttings generated by the teeth laterally toward the flat surfaces of the blade and outwardly toward the proximal end of the blade as the blade advances in a cut. Each of the teeth formed on the edge of the blade has a pointed form. Approximately half of the teeth lie in a row in which the respective points lie in a first cutting plane which extends in parallel with, and lies adjacent a first side of, a plane which extends longitudinally through the center of the blade body. The remaining teeth have points which lie in a second row in a second cutting plane which extends in parallel with, and lies adjacent a second side of, the plane which extends longitudinally through the blade body. The teeth have triangular cross-sections and are formed on alternatingly intersecting angled surfaces formed on the distal edge. The base of each tooth lies in the same plane as the surface upon which the tooth is formed. Each tooth has two side surfaces extending upwardly from the base and intersecting above the base to form a point. In the embodiment illustrated, the side surfaces are shaped as parallelograms and share a common side so as to form a knife-edge cutting surface which extends from the point backwardly toward the proximal end of the blade.

Claims

1. A blade for a surgical saw, comprising an elongate body having first and second substantially flat surfaces, and having a proximal end and a distal end and a plurality of teeth formed on an outwardly facing edge surface of said distal end, each of said teeth having a base and at least two surfaces which intersect to define a cutting edge, and wherein the bases of adjacent teeth are separated by a space, each of the spaces between the bases of adjacent teeth being defined by at least two, substantially flat intersecting surfaces which lie in intersecting planes which are non-perpendicular to the first and second substantially flat surfaces, wherein each of said intersecting surfaces defining said spaces is angled relative to each of said surfaces which intersect to define the cutting edges wherein one of said intersecting surfaces defining said space intersects said first flat surface at an angle so as to guide cuttings generated by the adjacent teeth laterally toward said first surface, and wherein the other of said intersecting surfaces defining said space intersects said second flat surface at an angle so as to guide cuttings laterally toward said second surface, as the blade advances in a cut.

2. A blade for a surgical saw according to claim 1, wherein said plurality of teeth comprise a first set of teeth spaced apart in a first row and a second set of teeth spaced apart in a second row, each tooth of said first set having a point which lies in a first cutting plane which extends in parallel with, and lies adjacent a first side of, a plane which extends longitudinally through the center of the body, each tooth of said second set having a point which lies in a second cutting plane which extends in parallel with, and lies adjacent a second side of, the plane which extends longitudinally through the center of the body, said plurality of teeth being disposed in alternating relation such that each tooth in the first set is disposed between two teeth of the second set, and vice versa.

3. A blade for a surgical saw according to claim 2, wherein the first and second cutting planes are substantially parallel to, and are spaced outwardly from, the first and second substantially flat surfaces of the blade.

4. A blade for a surgical saw according to claim 1, wherein at least one of said surfaces which define the spaces between adjacent teeth intersects a longitudinal plane which extends through the center of the blade at an angle of approximately 45°

.

5. A blade for a surgical saw according to claim 1, wherein said at least two intersecting surfaces lie in planes which intersect a longitudinal plane which extends through the center of the blade at angles of approximately 45°

, and intersect each other at an angle of approximately 90°

.

6. A blade for a surgical saw according to claim 1, wherein said intersecting surfaces which lie in intersecting planes intersect at substantially equal acute angles.

7. A blade for a surgical saw according to claim 6, wherein each of said teeth has a triangular cross-section and wherein the base lies in the same plane as the adjacent surface which defines a portion of the adjacent space.

8. A blade for a surgical saw according to claim 7, wherein each of the side surfaces of the tooth is shaped as a parallelogram, and wherein the parallelogram-shaped surfaces share a common side so as to form the cutting edge extending from the point backwardly toward the proximal end of the blade.

9. A blade for a surgical saw according to claim 8, wherein at least one of said substantially flat intersecting surfaces is substantially parallel to said cutting edge.

10. A blade for a surgical saw, comprising an elongate body having first and second substantially flat surfaces, and having a proximal end and a distal end and a plurality of teeth formed on an outwardly facing edge surface of said distal end, wherein said plurality of teeth comprise a first set of teeth spaced apart in a first row and a second set of teeth spaced apart in a second row, each tooth of said first set having a point which lies in a first cutting plane which extends in parallel with and lies adjacent a first side of a plane which extends longitudinally through the center of the body, each tooth of said second set having a point which lies in a second cutting plane which extends in parallel with and lies adjacent a second side of the plane which extends longitudinally through the center of the body, said plurality of teeth being disposed in alternating relation such that each tooth in the first set is disposed between two teeth of the second set, and vice versa, and wherein said outwardly facing edge comprises a plurality of alternating, substantially flat surfaces which lie in alternately intersecting planes, which planes also intersect a longitudinal plane which extends through the center of the blade at substantially equal acute angles, as measured from a point on said plane which extends longitudinally through the center of the body, and wherein each of said plurality of teeth comprises at least two surfaces which intersect to define a cutting edge, and wherein each of said plurality of teeth is formed on a respective one of said alternating surfaces, and wherein adjacent teeth are spaced apart on said alternating surfaces such that each space is defined by intersecting portions of adjacent alternating surfaces, and wherein each of said alternating surfaces is angled relative to each of said surfaces which intersect to define the cutting edges.

11. A blade for a surgical saw according to claim 10, wherein each of said teeth has a triangular cross-section and comprises a base, which lies in the same plane as the surface upon which the tooth is formed, and two side surfaces extending upwardly from the base and intersecting above the base to form the point.

12. A blade for a surgical saw according to claim 11, wherein each of the side surfaces of the tooth is shaped as a parallelogram, and wherein the parallelogram-shaped surfaces share a common side so as to form a knife-like cutting edge extending from the point backwardly toward the proximal end of the blade.

13. A blade for a surgical saw according to claim 12 , wherein at least one of said plurality or alternating surfaces is substantially parallel to the knife-like cutting edge.

14. A blade for a surgical saw according to claim 10, wherein the surfaces which define the spaces between adjacent teeth lie in planes which are non-perpendicular to the first and second substantially flat surfaces, whereby said non-perpendicular surfaces guide cuttings generated by the teeth laterally toward the flat surfaces of the blade and outwardly toward the proximal end of the blade as the blade advances in a cut.

15. A blade for a surgical saw according to claim 14, wherein at least one of said surfaces which define the spaces between adjacent teeth intersects the longitudinal plane which extends through the center of the blade at an angle of approximately 45°

.

16. A blade for a surgical saw according to claim 14, wherein each space between adjacent teeth is defined by at least two surfaces which lie in planes which intersect the longitudinal plane which extends through the center of the blade at angles of approximately 45°

, and intersect each other at an angle of approximately 90°

.

17. A blade for a surgical saw, comprising an elongate body having first and second substantially flat surfaces, and having a proximal end and a distal end and a plurality of teeth formed on an outwardly facing edge surface of said distal end, each of said teeth having a triangular cross-section, as viewed from a plane which extends longitudinally through the body of the blade, said cross-section having a base and a height, and each of said teeth having a length as measured transversely through said plane, said length being substantially greater than said height and base, and wherein the bases of adjacent teeth are separated by a space defined by at least two intersecting surfaces which are non-perpendicular to the first and second substantially flat surfaces, wherein one of said intersecting surfaces defining said space intersects said first flat surface at an angle so as to guide cuttings generated by the adjacent teeth laterally toward said first surface, and wherein the other of said intersecting surfaces defining said space intersects said second flat surface at an angle so as to guide cuttings laterally toward said second surface, as the blade advances in a cut and wherein each of said teeth comprises a pair of side surfaces extending upwardly from said base and intersecting along a common side to form a cutting edge and wherein each of said intersecting surfaces defining said spaces is angled relative to each of said side surfaces.

18. A blade for a surgical saw according to claim 17, wherein said side surfaces are shaped as parallelograms, and wherein adjacent corners of said pair of surfaces intersect to form a point at a distal end of each tooth.

19. A blade for a surgical saw according to claim 17, wherein the intersecting surfaces which define the spaces between the bases of adjacent teeth are substantially flat, planar surfaces.

20. A blade for a surgical saw according to claim 19, wherein at least one of said surfaces which define the spaces between adjacent teeth intersects the longitudinal plane which extends through the center of the blade at an angle of approximately 45°

.

21. A blade for a surgical saw according to claim 19, wherein said at least two intersecting surfaces lie in planes which intersect the longitudinal plane which extends through the center of the blade at angles of approximately 45°

, and intersect each other at an angle of approximately 90°

.

22. A blade for a surgical saw according to claim 17, wherein said cutting edge extends in substantially parallel relation to at least one of said intersecting surfaces which define the space between adjacent teeth.

23. A blade for a surgical saw, comprising an elongate body having first and second substantially flat surfaces, and having a proximal end and a distal end, a plurality of alternating surfaces formed on an outwardly facing edge surface of said distal end, said surfaces alternatingly arranged to intersect respective ones of said first and second substantially flat surfaces at first and second angles, respectively, and a plurality of teeth formed, respectively, on said alternating, intersecting surfaces, each tooth having a narrow base disposed in a central region of the respective surface so as to leave substantial portions of said surface exposed on either side of said base, wherein said exposed portions of adjacent surfaces guide cuttings generated by adjacent teeth laterally toward said first and second surfaces, respectively, and away from the distal end of the blade as the blade advances in a cut.

24. A blade for a surgical saw according to claim 23, wherein each of said teeth comprises a pair of side surfaces extending upwardly from said base and intersecting along a common side to form a cutting edge.

25. A blade for a surgical saw according to claim 24, wherein said side surfaces are shaped as parallelograms, and wherein adjacent corners of said pair of surfaces intersect to form a point at a distal end of each tooth.

26. A blade for a surgical saw according to claim 23, wherein said actuating surfaces intersect said first and second substantially flat surfaces at approximately 45°

.

27. A blade for a surgical saw according to claim 23, wherein each of said teeth are triangular in cross-section, as viewed from a longitudinal plane extending through the center of the blade, and wherein a length of each tooth as measured transversely to said longitudinal plane is substantially greater than a width of said base.