RESURFACING REAMER WITH CUTTING STRUTS

• US 20080300600A1
• Filed: 06/16/2008
• Published: 12/04/2008
• Est. Priority Date: 12/29/2006
• Status: Active Grant

• Current Assignee: Viant AS&O Holdings, LLC (Viant Medical, LLC)
• Original Assignee: Greatbatch Medical SA (Integer Holdings Corporation Inc)
• Inventors: Lechot, Andre, Guelat, Didier
• Granted Patent: US 8,075,563 B2
• Time in Patent Office: Days
• US Class Current: 606/80
• CPC Class Codes: A61B 17/1617 with mobile or detachable parts
• CPC Class Codes: A61B 17/162 Chucks or tool parts which are to be held in a chuck
• CPC Class Codes: A61B 17/1637 Hollow drills or saws producing a curved cut, e.g. cylindrical A61B10/025, A61B17/1695 take precedence
• CPC Class Codes: A61B 17/1668 for the upper femur A61B17/164 takes precedence
• CPC Class Codes: A61B 17/1684 for the shoulder
• CPC Class Codes: A61B 17/175 for preparing the femur for hip prosthesis insertion
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself

Abstract

Disclosed is a guided orthopedic bone reamer (10a) for cutting a profile relief shape (21a) into a joint bone (20). The reamer (10a) has a cutting head (30a) and an axial guide assembly (70). The cutting head (30a) has a profile cutting form (24a) with a rim (34) and an apex (38a). The apex (38a) connects to the cutting form (24a) by a set of struts (94). An axial guide assembly (70) has one end (44a) fixed to the apex (38a) and at the other end has a bayonet mechanism (76) connectable to a drive handle. Rim cutting teeth (36a) are set into the rim (34) to cut a cylindrical profile (21a), and bevel cutting teeth (96) integral to the struts (94) cut a bevel (25) onto the cylindrical form (21a) cut into the bone (20). A guide pin bore (12a) passes through the apex (38a)and the guide assembly (70) concentric with the axis of rotation (18) to receive a guide pin (14) to guide the reamer (10a) in cutting alignment relative to the joint bone (20) to be cut.

Claims

1. A guided orthopedic bone reamer (10a) for cutting a profile shape (21a) in relief into a bulbous joint bone (20), the reamer (10a) comprising:

a cutting head (30a) having a relief profile cutting form (24a) with a rim (34) and an apex (38a) with the apex (38a) connected to the cutting form (24a) by a set of at least two struts ((94), and the cutting head (30a)having an axis of rotation (18);

an axial guide assembly (70) having a first end (44a) fixed to the apex (38a) of the profile cutting form (24a) and having disposed proximate a second end (45) a drive interface (72) adapted to communicate with a means providing rotational force to the drive interface (72), and the guide assembly (70) having the axis of rotation 18 in common with the cutting head (30a);

rim cutting teeth (36a) set into the rim (34) of the cylindrical portion (106) of the cutting form (24a) to cut a cylindrical profile relief form (21a), and bevel cutting teeth (96) integral to the struts (94) to cut a beveled profile (25) onto the cylindrical form (21a) cut into the bone (20); and

a guide pin bore (12a) passing through the apex (38a)and at least partially into the guide assembly (70), the guide pin bore (12a) being concentric with the axis of rotation (18) and adapted to closely and rotatably receive a guide pin (14) to guide the reamer (10a) in an alignment relative to the joint bone (20) to be cut.

2. The guided orthopedic bone reamer (10a) of claim 1, wherein the cutting head (30a) further comprises the profile cutting form (24a) having a cylindrical portion (106) with a substantially cylindrical cross-section having a diameter D and a depth d.

3. The guided orthopedic bone reamer (10a) of claim 1, wherein the cutting form (24a) has a cutting rim (34), an inner surface (32a) and an apex (38a), with the apex (38a) being parallel to, spaced apart from and concentric with a rotational axis (18) of cutting form (24a).

4. A self-guiding bone reamer (10a) for cutting into a bone a shape in relief having a defined profile, the bone reamer (10a) comprising:

an axial guide assembly (70) having a boss (26b) adapted for attaching to a drive member (74) for imparting rotation to the reamer (10a), a distal cutter interface (30a), and an axial guide bore (12a) disposed on an axis (18) of the boss (26b) and adapted to receive a guide pin (14);

the cutter interface (30a) having a profile cutting form (24a) portion with a cylindrical cutting head (106) with a cutting rim (34) having a plurality of rim cutting teeth (36a) formed therein for cutting a cylindrical form (21a), and with a set of at least to struts (94) connecting the cutter interface (30a) to the boss (26a); and

the struts having bevel cutting teeth (96) integral to the edges of the struts (94), the bevel cutting teeth (96) cutting a beveled portion (25) on the cylindrical form (21a) cut into the bone 20.

5. The guided bone reamer (10a) of claim 4, wherein the rim cutting teeth (36a) are disposed to cut the cylindrical form (21a) with an outside diameter (D) substantially equal to inside diameter (D) of the profile cutting form (24a), allowing a cut bone wall to serve as an additional alignment guide for the bone reamer (10a).