SURGICAL SAW BLADE HAVING AT LEAST ONE PAIR OF OPPOSED TEETH SHAPED AS RIGHT TRIANGLES

• US 20090093815A1
• Filed: 12/08/2008
• Published: 04/09/2009
• Est. Priority Date: 05/30/1991
• Status: Active Grant

• Current Assignee: Synvasive Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Synvasive Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: FLETCHER, Henry Hasbrouck, Fisher, Michael Gerard
• Granted Patent: US 7,998,158 B2
• Time in Patent Office: Days
• US Class Current: 606/82
• 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 51/10 for hand-held or hand-operated devices
• CPC Class Codes: B23D 61/006 Oscillating 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: B27B 19/006 with oscillating saw blades; Hand saws with oscillating saw blades

Abstract

A cutting saw blade for use with an oscillatory power tool used in surgical bone cutting procedures including a blade having a distal end provided with teeth whose tips are located on a tangent line perpendicular to the long axis of the blade. The teeth are configured substantially as right triangles with their hypotenuses facing either towards the center of the blade or away from the center of the blade. A central tooth can be optionally provided. The surgical saw blade may have a distal end having at least one pair of teeth configured to be adjacent to each other and each of the pair of teeth is configured as a right triangle each having a hypotenuse which is oriented at least one of towards and away from the centrally positioned long axis.

Claims

1. A surgical saw blade for penetrating bone when said surgical saw blade is operatively coupled to an oscillatory power tool, comprising:

a surgical saw blade having a proximal end and a distal end;

said proximal end having a hub for attachment to an oscillatory power tool for driving engagement thereby;

said distal end having a plurality substantially identically shaped cutting teeth ending in a distal tip configured to be placed substantially on a tangent which is perpendicular to a radial line extending from the center line of the power tool cutting axis that bisects the arc of travel within which the blade travels such that said teeth contact the bone to be cut thereby to provide better tracking of said surgical saw blade when forming a kerf in the bone, whereupon said teeth cut both progressively and sequentially as the kerf begins to form to provide faster aggressive cutting and efficient chip removal; and

a lubricious coating material having a Rockwell hardness of about 65 to about 90 being applied to the outer surface of the surgical saw blade.

2. The surgical saw blade of claim 1 wherein said distal end has extending from each of said pair of teeth at least two additional teeth for cutting bone each of which are substantially identically shaped as a right triangle including a hypotenuse and an angle opposite the hypotenuse with the hypotenuse is oriented in the same direction as the hypotenuse of the adjacent tooth defining said pair of teeth and wherein the tips of all of the teeth are arrayed substantially on a tangent perpendicular to the centrally positioned long axis.

3. The surgical saw blade of claim 1 wherein said distal end has extending from each of said pair of teeth at least three additional teeth for cutting bone each of which are substantially identically shaped as a right triangle including a hypotenuse and an angle opposite the hypotenuse with the hypotenuse is oriented in the same direction as the hypotenuse of the adjacent tooth defining said pair of teeth and wherein the tips of all of the teeth are arrayed substantially on a tangent perpendicular to the centrally positioned long axis.

4. The surgical saw blade of claim 1 wherein said distal end has extending from each of said pair of teeth at least four additional teeth for cutting bone each of which are substantially identically shaped as a right triangle including a hypotenuse and an angle opposite the hypotenuse with the hypotenuse is oriented in the same direction as the hypotenuse of the adjacent tooth defining said pair of teeth and wherein the tips of all of the teeth are arrayed substantially on a tangent perpendicular to the centrally positioned long axis.

5. The surgical saw blade of claim 1 wherein said distal end has extending from each of said pair of teeth at least five additional teeth for cutting bone each of which are substantially identically shaped as a right triangle including a hypotenuse and an angle opposite the hypotenuse with the hypotenuse is oriented in the same direction as the hypotenuse of the adjacent tooth defining said pair of teeth and wherein the tips of all of the teeth are arrayed substantially on a tangent perpendicular to the centrally positioned long axis.

6. The surgical saw blade of claim 1 wherein the coefficient of friction of the lubricious coating material is in the range of about 0.08 to about 0.25.

7. The surgical saw blade of claim 1 wherein the lubricious coating material is selected from a group consisting of Composite Diamond, a Teflon/Nickel Composite, an Inorganic Powder/Nickel, a Fluoropolymer, a Fusion bonded fluoropoly, a Thermal Spray Polymer, a PVD Matrix, polytetrafluoroethylene, Fluorinated Ethylene Propylene, Perfluoroalkoxy, Ethylene/Tetrafluoroethylene Copolymer and Anti-microbial Material.