Expandable reaming device
First Claim
1. A reaming device comprising:
- a reamer head;
a shaft operatively connected to the reamer head for rotating the reamer head on a reamer head axis;
wherein the reamer head comprises a moveable first blade having an outer edge on a first plane that is parallel to the reamer head axis, wherein the outer edge curves greater than 180 degrees on a first radius and the outer edge has a sharpened portion;
wherein the first blade is moveable in a direction perpendicular to said first plane out away from said reamer head axis, so that the effective cutting diameter of the rotating head is increased.
0 Assignments
0 Petitions
Accused Products
Abstract
An expanding reamer for reaming or cutting a concave surface, for example, for reaming an acetabulum in preparation for implanting a prosthetic component, such as an acetabular cup or socket, during a hip arthroplasty. The reamer includes a rotating shaft cooperating with a surgical drill or other power source at one end and rotating a reamer head at the other end, and a system adapted to expand one or more blades on the reamer head. In a preferred version, the reamer head comprises a plurality of generally circular, preferably substantially flat and parallel blades, the outer blades of which are radially expandable as segments of a cutting sphere to enlarge the effective diameter of the reamer head. A transverse blade may guide expansion of the blades to move upwards as well as outward to maintain a nearly perfect cutting sphere across a range of diameters. Upon rotation of the reamer head, the blades form a portion of an effective cutting sphere that is preferably greater-than-180-degrees in order to allow greater flexibility in placement of the shaft of the reamer relative to the surface being reamed, for example, relative to the center of axis of the acetabulum.
-
Citations
22 Claims
-
1. A reaming device comprising:
-
a reamer head;
a shaft operatively connected to the reamer head for rotating the reamer head on a reamer head axis;
wherein the reamer head comprises a moveable first blade having an outer edge on a first plane that is parallel to the reamer head axis, wherein the outer edge curves greater than 180 degrees on a first radius and the outer edge has a sharpened portion;
wherein the first blade is moveable in a direction perpendicular to said first plane out away from said reamer head axis, so that the effective cutting diameter of the rotating head is increased. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
- 18. A device for forming a concave surface, the device having a cutting head rotatable on a head axis, the cutting head having a first and second blade on opposite sides of the head axis, the first and second blades being moveable outward from the head axis from a contracted position to a expanded position, wherein said first and second blade are parallel to each other and to the head axis in both the contracted position and the expanded position.
Specification