ACETABULAR CUP PROSTHESIS POSITIONING INSTRUMENT AND METHOD
First Claim
1. A cup impactor assembly comprising:
- a shaft;
a cup coupler at a cup end of the shaft adapted to releasably connect a cup in fixed relation for subsequent impacting;
a handle at an impacting end of the shaft;
a visual guide mounted to at least one of the shaft and the handle, the visual guide producing visual guidance toward at least one anatomical landmark of a pelvis;
an inertial sensor unit adapted to produce at least an orientation output related to an orientation of the cup impactor assembly and having a patient-specific file comprising;
calibration data based on a planned geometric relation between an initial reference orientation of the cup impactor assembly and the at least one anatomical landmark of the pelvis via the visual guidance of the visual guide, the calibration data for calibrating the inertial sensor unit relative to the pelvis for the inertial sensor unit to produce said orientation output; and
a desired acetabular cup orientation data based on preoperative planning.
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Accused Products
Abstract
A method for assisting in positioning the acetabular cup comprises orienting a cup positioning instrument with a cup thereon in an initial reference orientation relative to an acetabulum of a pelvis with the cup forming a joint with the acetabulum, the cup positioning instrument comprising an inertial sensor unit with pre-planned orientation data for a desired cup orientation based on at least one landmark of the pelvis, The cup positioning instrument is rotated to a desired abduction angle as guided by an interface of the cup positioning instrument, based on movements relative to at least one landmark. The cup positioning instrument is rotated to a desired anteversion angle as guided by the interface of the cup positioning instrument, based on movements relative to the at least one landmark. Upon reaching the desired cup orientation as indicated by the interface, the cup is impacted into the acetabulum.
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Citations
5 Claims
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1. A cup impactor assembly comprising:
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a shaft; a cup coupler at a cup end of the shaft adapted to releasably connect a cup in fixed relation for subsequent impacting; a handle at an impacting end of the shaft; a visual guide mounted to at least one of the shaft and the handle, the visual guide producing visual guidance toward at least one anatomical landmark of a pelvis; an inertial sensor unit adapted to produce at least an orientation output related to an orientation of the cup impactor assembly and having a patient-specific file comprising; calibration data based on a planned geometric relation between an initial reference orientation of the cup impactor assembly and the at least one anatomical landmark of the pelvis via the visual guidance of the visual guide, the calibration data for calibrating the inertial sensor unit relative to the pelvis for the inertial sensor unit to produce said orientation output; and a desired acetabular cup orientation data based on preoperative planning. - View Dependent Claims (2, 3, 4, 5)
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Specification