Surgical sagittal saw and blade cartridge, the blade cartridge having reinforcing ribs integral with the blade bar

Patent metadata

Field	Value
Publication number	US-9439655-B2
Application number	US-201414163092-A
Country	US
Kind code	B2
Filing date	Jan 24, 2014
Priority date	Jul 27, 2011
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

A surgical sagittal and a saw blade cartridge. The saw has a head to which the blade cartridge is releasably mounted and a clamping assembly that releasably hold the cartridge to the head. The blade cartridge includes a blade bar, a blade head mounted to the bar and at least one drive rod that actuates the blade head. A rib projects from the blade bar to stiffen the cartridge. The rib extends over the blade bar so as to extend both proximally and distally relative to where the clamp assembly bears against the blade bar. The rib reduces skiving of the cartridge when a load is applied to either the top or bottom surface of the blade bar.

First claim

What is claimed is:

1. A sagittal saw and blade cartridge assembly, including:
a saw having:
a head with a surface, the surface having opposed proximal and distal ends;
a lock assembly attached to said saw head that includes a clamping member mounted to said saw head that extends over the saw head surface at a location proximal to the distal end of the saw head surface and that is moveably mounted to said saw head so as to selectively bear against a blade bar disposed on the saw head surface so as to releasably hold the blade bar to the surface; and
an oscillating drive assembly mounted to said head that has a drive member shaped to engage at least one blade cartridge drive rod, the oscillating drive assembly configured to receive a rotational movement and convert the rotational movement into movement that oscillates the said drive member; and

a blade cartridge including:
a blade bar that has opposed proximal and distal ends that is releasably attached to the surface of said saw head so as to be disposed between the surface and said lock assembly clamping member so that the clamping member can releasably hold said blade bar to the saw head surface;
at least one rib that extends outwardly from an outer surface of said blade bar, said rib being located so that, when said blade bar is held to the surface of said saw head, said rib extends proximal to said lock assembly clamping member and distally forward of said clamping member and said at least one rib does not extend beyond the distal end of the saw head surface;
a blade head having a base disposed in said blade bar adjacent the distal end of said blade bar and a crown that extends forward from said base so as to be located forward of the distal end of said blade bar, said crown having teeth and having a thickness greater than that of said blade head base, so that a kerf cut by said teeth is of sufficient width to accommodate the distal end of said blade bar; and
at least one drive rod that is connected to said blade head base and extends from said blade head base towards the proximal end of the blade bar, said drive rod being configured for releasable attachment to said drive member of said saw oscillating drive assembly so that the actuation of said drive member results in reciprocation of said at least one drive rod which results in the oscillation of said blade head.

2. The surgical saw and blade cartridge assembly of claim 1 , wherein said blade cartridge is formed so that said at least one rib extends outwardly away from said blade bar so that when said blade cartridge is mounted to said saw, said at least one rib extends outwardly away from the saw head surface.

3. The surgical saw and blade cartridge assembly of claim 1 , wherein said blade cartridge is formed so that the at least one said rib is two said ribs and said ribs are located on opposed sides of said blade bar so that when said blade cartridge is attached to said saw, head, said ribs are located on opposed sides of said clamping member of said saw locking assembly.

4. The surgical saw and blade cartridge assembly of claim 1 , wherein said at least one rib of said blade cartridge extends distally forward along said blade bar from a location that is distal to the proximal end said blade bar and proximally rearward of said clamping element of said saw lock assembly.

5. The surgical saw and blade cartridge assembly of claim 1 , wherein said blade cartridge is further constructed so that:
said blade head base is disposed in said blade bar to pivot around a static surface internal to said blade bar; and
said at least one drive rod is two said drive rods internal to said blade bar, wherein said drive rods extend proximally from said blade head base on opposed sides of the static surface internal to said blade bar around which said blade head base pivots.

6. A sagittal saw and blade cartridge assembly, including:
a saw having:
a head having proximal and distal ends and a surface;
a lock assembly that includes a clamping member mounted to said saw head that extends over the saw head surface at a location proximal to the distal end of said saw head that is moveably mounted to said saw head so as to selectively bear against a bar disposed on the saw head surface so as to secure the bar to the surface; and
an oscillating drive assembly mounted to said head that has a drive member shaped to engage at least one blade cartridge drive rod, the oscillating drive assembly configured to receive a rotational movement and convert the rotational movement into movement that oscillates the drive member; and

a blade cartridge including:
a blade bar that has opposed proximal and distal ends, a length between the ends and that is releasably seated on the surface of said saw head so as to be disposed between the surface and said lock assembly clamping member so that said clamping member can releasably hold said blade bar to the saw head surface, said blade bar being formed with a first opening located distal to the proximal end of said blade bar through which, when said blade bar is seated on the surface of said head, said clamping member extends;
at least one rib that extends outwardly from an outer surface of said blade bar, said rib being located so that, when said blade bar is held to the surface of said blade bar, said at least one rib extends both proximally and distally away from the first opening in said blade bar and over said blade bar a distance less than one-half the length of said blade bar so as to terminate at a location proximal to the distal end of said blade bar;
a blade head having base disposed in said blade bar adjacent the distal end of said blade bar and a crown that extends forward from said base so as to be located forward of the distal end of said blade bar, said crown having teeth and a thickness greater than the thickness of said blade head base so that a kerf cut by said teeth is of sufficient width to accommodate the distal end of said blade bar; and
at least one drive rod that is connected to said blade head and extends from said blade head base towards the proximal end of said blade bar and that is configured for releasable attachment to said drive member of said saw oscillating drive assembly so that the actuation of said drive member results in reciprocation of said at least one drive which results in the oscillation of said blade head.

7. The sagittal saw and blade cartridge assembly of claim 6 , wherein, said at least one rib of said blade cartridge does not extend forward of the distal end of the saw head.

8. The surgical saw and blade cartridge assembly of claim 6 , where said blade cartridge is formed so that said at least one rib extends outwardly away from said blade bar so that when said blade cartridge is mounted to said saw, said at least one rib extends outwardly away from the saw head surface.

9. The surgical saw and blade cartridge assembly of claim 6 , wherein said blade cartridge is formed so that the at least one said rib is two said ribs and said ribs are located on opposed sides of said blade bar so that when said blade bar is seated on the surface of said saw head, said ribs are located on opposed sides of said clamping member of said saw clamping assembly.

10. The surgical saw and blade cartridge assembly of claim 6 , wherein said blade cartridge is further constructed so that the at least one said drive rod is two said drive rods.

11. The surgical saw and blade cartridge assembly of claim 6 , wherein
said blade bar is formed to have at least one second opening located distal to the proximal end of said blade bar and proximal to the first opening in said blade bar, where said blade cartridge at least one drive rod engages said drive member

Assignees

• Stryker Corp
• Stryker Ireland Ltd

Inventors

• Cosgrove Liam
• Walen James G
• White Frank

Classifications

• A61B2017/00734

  battery operated · CPC title

• A61B17/14 Primary

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

• A61B17/141 Primary

  Human Necessities · mapped topic

• A61B17/320068

  using mechanical vibrations, e.g. ultrasonic (A61B17/22012 takes precedence; dental tooth drilling devices operated by vibration A61C3/03; removing intra-ocular material using mechanical vibrations A61F9/00745) · CPC title

• A61B17/142 Primary

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