Pelvis registration instrument and method
AssigneeArthromeda, Inc.
InventorMehran S. Aghazadeh
Life of this patent
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Abstract
A pelvis registration apparatus includes a body extending along a longitudinal axis and an engagement assembly coupled to a distal end of the body. The engagement assembly includes three or more contact points that are selectively movable radially with respect to the longitudinal axis of the body to position the contact points at a desired distance relative to a centerline of the body and selectively movable about the body to position the contact points at desired circumferential locations. The pelvis registration apparatus can be provided in a system that further includes position sensors and a controller, where the controller is configured to receive position and orientation data from the position sensors and calculate angular relationships derived from the position and orientation data.
Claims21
A pelvis registration apparatus comprising:
- a body having a distal end and a proximal end, the body extending along a longitudinal axis;
- and
- an engagement assembly coupled to the distal end of the body and comprising three or more contact points, wherein the contact points are:
- selectively movable radially with respect to the longitudinal axis to position the contact points at a desired distance relative to a centerline of the body;
- and
- selectively movable about the body to position the contact points at desired circumferential locations relative to one another:
- wherein:
- the engagement assembly comprises a plurality of leg linkages coupled to the body, each leg linkage providing one or more of the contact points, the leg linkages each comprising a leg member having a proximal end and an opposite, distal end;
- the proximal ends of the leg members are pivotably coupled to the body about a pivot axis perpendicular to the longitudinal axis to position the distal ends of the leg members at the desired distance;
- the leg linkages are rotatable about the body to selectively position the leg assemblies at desired circumferential locations;
- each leg linkage further comprises a support member having a proximal end pivotably coupled to the body and a distal end pivotably coupled to an intermediate portion of the leg member;
- and
- the body comprises an outer shaft and an inner shaft extending within the outer shaft, the proximal ends of the support member are coupled to the inner shaft;
- and further comprising a handle coupled to the inner shaft and threadingly engaged with the outer shaft, such that rotation of the handle causes the inner shaft to move longitudinally with respect to the outer shaft, movement of the inner shaft causing the support member to move the distal ends of the leg members radially with respect to the body.
A pelvis registration apparatus comprising:
- a body having a distal end and a proximal end, the body extending along a longitudinal axis;
- an engagement assembly coupled to the distal end of the body and comprising three or more contact points, wherein the contact points are:
- selectively movable radially with respect to the longitudinal axis to position the contact points at a desired distance relative to a centerline of the body;
- and
- selectively movable about the body to position the contact points at desired circumferential locations relative to one another;
- and
- acetabulum data from one or more computed tomography scans of a patient, the desired distances relative to the centerline of the body and the desired circumferential locations for the contact points of the engagement assembly being determined based on the acetabulum data.
A system for use in implanting a prosthesis, the system comprising:
- a pelvis registration apparatus comprising:
- a body having a distal end and a proximal end, the body extending along a longitudinal axis;
- and
- an engagement assembly coupled to the distal end of the body and comprising three or more contact points, wherein the contact points are:
- selectively movable radially with respect to the longitudinal axis to position the contact points at a desired distance relative to a centerline of the body;
- and
- selectively movable about the body to position the contact points at desired circumferential locations relative to one another;
- a controller;
- and
- first and second position sensors capable of reporting position and orientation data to the controller, the first position sensor being removably coupled to the pelvis registration apparatus and the second position sensor disposed in a fixed, spaced relation relative to the first position sensor, wherein the second position sensor is configured to be coupled to a patient's bony anatomic structure;
- wherein the controller is configured to:
- receive the position and orientation data from the first and second position sensors;
- and
- calculate angular relationships derived from the position and orientation data.
Dependencies are inferred from the claim text.