Integrated cutting guide and surgical saw blade assembly, the cutting guide including a moveable head that constrains the movement of the blade assembly

Patent metadata

Field	Value
Publication number	US-9848887-B2
Application number	US-201715418122-A
Country	US
Kind code	B2
Filing date	Jan 27, 2017
Priority date	Jul 9, 2004
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A surgical sagittal saw blade assembly and cutting guide for use with the blade assembly. The blade assembly includes a static bar from which a moving blade head protrudes. The blade head is reciprocated by a drive link internal to the bar. The cutting guide has a body that is positioned adjacent where the blade is to be used to cut tissue. The cutting guide has an outer surface over which the blade assembly is positioned. The cutting guide has a constraining feature. The constraining feature holds the blade bar to the body of the guide so the blade assembly can move over the body while being constrained from movement above the outer surface of the body. The constraining feature is mounted to the body of the cutting guide so as to be able to move while constraining guide retains the blade bar.

First claim

What is claimed is:

1. A saw blade and cutting guide assembly, said assembly including:
a saw blade assembly, said saw blade assembly including:
an elongated blade bar having opposed proximal and distal ends, the proximal end shaped to be attached to a saw and the distal end having a thickness;
a blade having a base that is movably mounted in said blade bar adjacent the bar distal end and teeth that extend from said base and that are located outside of said blade bar wherein said head is formed with teeth, said teeth having a thickness so that a kerf cut by said teeth is able to receive the distal end of said blade bar; and
at least one drive rod movably disposed in said blade bar, said at least one drive rod having a proximal end shaped to be attached to a driver integral with the saw and a distal end connected to said blade base so that the actuation of said drive rod by the saw driver results in said drive rod reciprocating said blade; and

a cutting guide, said cutting guide including:
a body, said body shaped to have: an outer surface over which said blade bar is disposed; and a feature that facilitate holding said body static relative to bone;
a constrainment member having a constraining head that is disposed above the outer surface of said body so that said blade bar of said saw blade assembly is disposed between the outer surface of said body and said head, said constrainment further formed to retain said blade bar assembly so that said constrainment member allows said blade bar to pivot relative to said constrainment member and move forward relative to said body while said constraining head simultaneously constrains movement of said blade bar away from the outer surface of said body; and
coupling features integral with said body and said constrainment member that allow said constrainment member to move over the outer surface of said body while said constrainment member retains said blade bar of said saw blade assembly.

2. The saw blade and cutting guide assembly of claim 1 , wherein said cutting guide is further formed so that:
said constrainment member is a pin, said pin having a base with a width, a stem that extends outwardly from said base, said stem having a width, the width of said stem being less than the width of said base, and said head extends outwardly from an end of said stem opposite an end of said stem to which said base is attached; and
said body of said cutting guide is formed with a groove that extends inwardly from the outer surface of said body and said groove is dimensioned to slidably receive said base and said stem of said pin so as to allow the movement of said pin in said groove while preventing movement of said pin above the outer surface of said body so that said base and said stem of pin function as said coupling features of said constraining member and said groove functions as said coupling feature of said body.

3. The saw blade and cutting guide assembly of claim 1 , wherein the outer surface of said body of said cutting guide is planar.

4. The saw blade and cutting guide assembly of claim 1 , wherein said saw blade assembly is further formed so that said teeth of said blade extend forward from distal end of said blade bar.

5. The saw blade and cutting guide assembly of claim 1 , wherein said saw blade assembly is further formed so that:
said blade bar has at least one side edge that extends proximally from the distal end of said blade bar; and
said blade is formed and mounted in said blade bar so that said teeth of said blade extend outwardly from the side edge of said blade bar.

6. The saw blade and cutting guide assembly of claim 1 , wherein:
said blade bar has at least one side edge that extends proximally from the distal end of said blade bar; and
said blade is formed and mounted in said blade bar so that said teeth of said blade extend outwardly from the side edge of said blade bar and said at least one drive rod is integrally formed with said blade.

7. The saw blade and cutting guide assembly of claim 1 , wherein said saw blade assembly is formed so that said blade is mounted in said blade bar and said at least one drive rod is connected to said blade so as to pivot said blade in said blade bar.

8. The saw blade and cutting guide assembly of claim 1 , wherein said saw blade assembly includes two said drive rods that are connected to said blade so reciprocate said blade.

9. The saw blade and cutting guide assembly of claim 1 , wherein said blade and said at least one drive rod of said saw blade assembly are separate components and said drive rod is pivotally connected to said blade.

10. The saw blade and cutting guide assembly of claim 1 wherein said blade and at least one drive rod of said saw blade assembly are a single-piece assembly.

11. The saw blade and cutting guide assembly of claim 1 , wherein:
said blade bar of said saw blade assembly is formed with an opening; and
said constraining member of said cutting guide is seated in the opening of said blade bar.

12. The cutting guide of claim 1 , wherein said feature of said body that facilitates holding said body static relative to bone is at least one bore formed in said body, said at least one bore dimensioned to receive a pin that holds said body to bone.

13. The saw blade and cutting guide assembly of claim 1 , wherein:
said blade bar of said saw blade assembly is formed with an opening; and
said constrainment member of said cutting guide is seated in the opening of said blade bar.

14. A saw blade and cutting guide assembly, said assembly including:
a saw blade assembly, said saw blade assembly including:
an elongated blade bar having opposed proximal and distal ends, the proximal end shaped to be attached to a saw and the distal end having a thickness;
a blade having a base that is movably mounted in said bar adjacent the bar distal end and teeth that extend from said base that are located outside of said bar wherein said teeth have a thickness so that a kerf cut by said teeth is able to receive the distal end of said blade bar; and
at least one drive rod movably disposed in said blade bar, said at least one drive rod having a proximal end shaped to be attached to a driver integral with the saw and a distal end connected to said blade base so that the actuation of said drive rod by the saw driver results in said drive rod reciprocating said blade;

a cutting guide, said cutting guide including:
a body, said body shaped to have: an outer surface over which said blade bar is disposed; a groove that extends inwardly from the outer surface; and a feature that facilitate holding said body static relative to bone; and
a constrainment unit, said constrainment unit having a base anchor disposed in the groove of said body of said cutting guide and a head that is connected to said base anchor that is spaced above the outer surface of said body so that said blade bar of said saw blade assembly is disposed between the outer surface of said body and said head of said constrainment unit, wherein said constrainment unit is configured to allow said blade bar to both pivot relative to said constrainment unit and move forward over the outer surface of said body while, simultaneously, said constraining head simultaneously constrains movement of said blade bar away from the outer surface of said body and said slot of said body and said base anchor are collectively configured to allow said base anchor to move within the slot while restraining outward movement of said base anchor so that, while said blade bar is disposed between the outer surface of said body and said constrainment head, said constrainment unit and said blade bar are

Assignees

• Stryker Corp

Inventors

• Carusillo Steve
• Plaskon Gregory
• Collazo Carlos
• Canonaco Alessandro
• Neal David

Classifications

• A61B17/149

  Chain, wire or band saws · CPC title

• A61B17/142 Primary

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

• B27B19/006

  with oscillating saw blades; Hand saws with oscillating saw blades · CPC title

• A61B17/157

  Cutting tibia · CPC title

• A61B17/144

  with cutting edges at the side of the saw blades · CPC title