Surgical sagittal saw with a drive assembly capable of displacing the attached blade in a crossed loop pattern

Patent metadata

Field	Value
Publication number	US-9232949-B2
Application number	US-201314069669-A
Country	US
Kind code	B2
Filing date	Nov 1, 2013
Priority date	May 4, 2011
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

A saw for pivoting a blade in a sagittal plane. The saw includes a drive assembly with at least one drive member. The drive assembly is configured to both reciprocate the blade in the sagittal plane and to simultaneously pivot the blade around an axis that extends through the sagittal plane. The drive assembly is configured to reciprocate and pivot the blade at different frequencies. Consequently the teeth ( 186 ) of the blade travel in a loop pattern that crosses itself.

First claim

What is claimed is:

1. A surgical sagittal saw, said saw including:
a body;
a motor disposed in said body, said motor having an output shaft that is rotated upon actuation of said motor;
a blade mount attached to said body that is configured to releasably receive a surgical sagittal saw blade, the saw blade having a distal end with teeth;
a drive assembly connected between said motor output shaft and the saw blade, said drive assembly including first and second actuating members that engage the saw blade, wherein:
said first actuating member is configured to undergo a motion that reciprocates the saw blade back and forth in a plane in which the blade is disposed;
said second actuating member is configured to undergo a motion that pivots the saw blade back and forth around an axis that extends through the plane in which the saw blade is reciprocated; and

said first and second actuating members are connected to said motor output shaft so that the rotation of said output shaft causes said actuating members to simultaneously reciprocate and pivot the saw blade such that the saw blade reciprocates at a first frequency and pivots at a second frequency that is different from the first frequency.

2. The surgical sagittal saw of claim 1 , wherein said drive assembly first and second actuating members are connected to said motor output shaft to reciprocate and pivot the saw blade at different frequencies so the teeth of the blade travel in a loop pattern that crosses over itself at at least one point.

3. The surgical sagittal saw of claim 1 , wherein:
a longitudinal axis extends between opposed proximal and distal ends of said body; and
said drive assembly first and second actuating members are further connected between said motor output shaft and the saw blade to reciprocate and pivot the saw blade so the teeth of the saw blade move in a loop pattern that crosses over itself at a point along an extension of the longitudinal axis that extends between opposed proximal and distal ends of said body.

4. The surgical sagittal saw of claim 1 , wherein said drive assembly first and second actuating members are further connected between said motor output shaft and the saw blade to reciprocate and pivot the saw blade at different frequencies so that the teeth of the blade travel in a loop pattern that crosses over itself at at least one point and that is symmetric around at least one axis that extends through the loop.

5. The surgical sagittal saw claim 1 , wherein said drive assembly first and second actuating members are further connected between said motor output shaft and the saw blade to reciprocate and pivot the saw blade at different frequencies so that the teeth of the blade travel in a loop pattern that crosses over itself at a single point.

6. The surgical sagittal saw claim 1 , wherein said blade mount is moveably attached to said body and is part of said drive assembly such that the blade mount is able to move so that the movement of said blade mount results in at least one of the reciprocating movement or pivoting movement of the saw blade.

7. The surgical sagittal saw of claim 1 , wherein:
said blade mount is moveably attached to said body and is part of one of said drive assembly first or second actuating members such that the movement of said blade mount results in one of the reciprocating movement or pivoting movement of the saw blade; and
said drive assembly includes a drive link that is moveably mounted to said blade mount that is part of the other one of said drive assembly second or first actuating members and that is shaped to engage the saw blade and the movement of which results in the other of the pivoting movement or reciprocating movement of the saw blade.

8. The surgical sagittal saw of claim 7 , wherein:
said blade mount is moveably mounted to said body to pivot the saw blade; and
said drive assembly drive link mounted to said blade mount is moveably mounted to said blade mount to reciprocate the saw blade.

9. The surgical sagittal saw of claim 1 , wherein said at least one of said drive assembly first or second actuating members is formed with a pin that is shaped to engage the saw blade and said pin is mounted to said body to pivot back and forth around an axis.

10. The surgical sagittal saw of claim 1 , wherein at least one of said drive assembly first or second actuating members is mounted to said body to rotate in a complete 360° circle.

11. The surgical sagittal saw of claim 1 , wherein said blade mount includes:
a surface on which the blade is seated for moveable movement; and
a static component mounted to the surface that engages the saw blade to constrain movement of the blade on the surface.

12. The surgical sagittal saw of claim 1 , wherein:
the saw blade is moveably mounted to said blade mount; and
a wear bar is removably mounted to said blade mount so as to be between the blade and an adjacent static feature of said blade mount.

13. The surgical sagittal saw of claim 1 , wherein said drive assembly first and second actuating members are connected to said motor output shaft and are configured to reciprocate the saw blade at frequency that is greater than the frequency at which the saw blade is pivoted.

14. The surgical sagittal saw of claim 1 , wherein said drive assembly first and second actuating members are connected to said motor output shaft and are configured to reciprocate the saw blade at a frequency that is two times the frequency at which the saw blade is pivoted.

15. The surgical saw of claim 1 , wherein said blade mount is mounted to a head that is located forward of said body.

16. The surgical saw of claim 1 , further including a cap that is moveably disposed over said blade mount to removable hold the saw blade to said blade mount.

17. The surgical sagittal saw of claim 1 , wherein:
said first actuating member includes a first coupling feature that releasably engages the saw blade so that the motion of said first actuating member results in the reciprocation of the saw blade; and
said second actuating member includes a second coupling feature separate from said first coupling feature that releasably engages the saw blade so that the motion of said second actuating member results in the pivoting of the saw blade.

18. The surgical sagittal saw of claim 1 , wherein:
a single one of said first actuating member or said second actuating member is connected to said motor output shaft for actuation upon the rotation of said output shaft; and
the other of said second actuating member or said first actuating member is connected to the said actuating member connected to said motor output shaft for actuation upon the actuation upon the actuation of said actuating member connected to said output shaft.

19. The surgical sagittal saw of claim 1 , wherein at least one of said drive assembly first actuating member or said second actuating member is a drive shaft that is connected to said motor output shaft to, upon rotation of said output shaft, rotate.

20. The surgical sagittal saw of claim 1 , wherein:
said drive assembly first actuating member is a first drive shaft that is rotatably mounted to said body;
said drive assembly second actuating member is a second drive shaft separate from said first drive shaft that is rotatably mounted to said body; and
both said first and second drive shafts are connected to said motor output shaft to, upon rotation of said output shaft, rotate.

21. A surgical sagittal saw said saw including:
a body;
a motor

Assignees

• Stryker Corp

Inventors

• Carusillo Steven
• Walen James G

Classifications

• A61B17/32002 Primary

  with continuously rotating, oscillating or reciprocating cutting instruments · CPC title

• A61B17/142 Primary

  with reciprocating saw blades, e.g. with cutting edges at the distal end of the saw blades · CPC title

• A61B17/14

  Surgical saws ({A61B17/1637 takes precedence;} dental saws for teeth A61C3/12) · CPC title

• A61B17/141

  Human Necessities · mapped topic

• A61B17/148 Primary

  Human Necessities · mapped topic