US 8,075,563 B2 · Resurfacing reamer with cutting struts

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.

Claims25

Dependent claims

A reamer, which comprises:

a) a cylindrically-shaped cutting form having a constant diameter perpendicular to and extending along a longitudinal axis thereof from a proximal cutting form portion to a distal cutting rim provided with a plurality of distal cutting teeth;
b) at least two struts spaced about and disposed at an acute angle with respect to the longitudinal axis, wherein there is open area intermediate adjacent struts connecting between the proximal cutting form portion and a base;
c) an axial guide having a guide length extending from a distal guide end connected to the base to a proximal guide end, wherein an open cannulation passes through the axial guide from the distal guide end to and through the proximal guide end;
and
d) at least two radial bars, each having a proximal radial bar end attached to the axial guide and a distal radial bar end that is not connected to either the axial guide or the cutting form.

2 more elements

A reamer system, which comprises:

a) a reamer, comprising:
i) a cylindrically-shaped cutting form having a constant diameter perpendicular to and extending along a longitudinal axis thereof from a proximal cutting form portion to a distal cutting rim provided with a plurality of distal cutting teeth;
ii) at least two struts spaced about and disposed at an acute angle with respect to the longitudinal axis, wherein there is open area intermediate adjacent struts connecting between the proximal cutting form portion and a base;
iii) an axial guide having a guide length extending from a distal guide end connected to the base to a proximal guide end, wherein an open cannulation passes through the axial guide from the distal guide end to and through the proximal guide end;
and
iv) at least two radial bars, each having a proximal radial bar end attached to the axial guide and a distal radial bar end that is not connected to either the axial guide or the cutting form;
and
b) a reamer holder having a bayonet locking mechanism capable of locking the holder to the reamer at the radial bars.

5 more elements

Dependencies are inferred from the claim text.

Resurfacing reamer with cutting struts

Life of this patent

Resurfacing reamer with cutting struts

Life of this patent

Abstract

Claims25