Non-imaging tracking tools and method for hip replacement surgery
First Claim
1. A method of determining a surgical patient'"'"'s pelvic position and inputting that position into a computer via a tracking system, suitable for use in navigating partial or total hip replacement surgery, comprising the steps of:
- aligning the patient in relation to a patient positioning frame with pelvic anatomical features of the patient disposed in secure mechanical relationship with corresponding locating features on said positioning frame;
acquiring with a tracking system the positions of a plurality of index points, wherein each of said index points is respectively disposed at a previously known displacement relative to a corresponding one of said locating features; and
defining a pelvic plane by calculation from the acquired positions of said index points, said calculation including;
compensating for the previously known displacement of each said index point relative to its corresponding locating feature, thereby finding the locations of said locating features from the acquired positions of said index points; and
defining a plane from the calculated positions of the locating features.
1 Assignment
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Accused Products
Abstract
The invention includes a method of determining a surgical patient'"'"'s pelvic position and inputting that position into a computer via a tracking system, suitable for use in navigating partial or total hip replacement surgery. The patient is first aligned with anatomical reference points in relation to corresponding locating features on a patient positioner. The positions of index features on the patient positioner are then acquired via a tracking system. Based on the positions of the index features and their known relationship to the locating features, the locations of the anatomical reference features are calculated and a pelvic plane is defined therefrom. The invention also includes a surgical tool for mounting a trackable target to a human bone, suitable for fixation to a human femur. This tool includes a removable bone clamp and a releasable coupling member, integrated with said removable bone clamp.
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Citations
23 Claims
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1. A method of determining a surgical patient'"'"'s pelvic position and inputting that position into a computer via a tracking system, suitable for use in navigating partial or total hip replacement surgery, comprising the steps of:
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aligning the patient in relation to a patient positioning frame with pelvic anatomical features of the patient disposed in secure mechanical relationship with corresponding locating features on said positioning frame;
acquiring with a tracking system the positions of a plurality of index points, wherein each of said index points is respectively disposed at a previously known displacement relative to a corresponding one of said locating features; and
defining a pelvic plane by calculation from the acquired positions of said index points, said calculation including;
compensating for the previously known displacement of each said index point relative to its corresponding locating feature, thereby finding the locations of said locating features from the acquired positions of said index points; and
defining a plane from the calculated positions of the locating features. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A surgical tool for mounting a trackable target to a human bone, suitable for fixation to a human femur, comprising:
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a removable bone clamp; and
a releasable coupling member, integrated with said removable bone clamp and arranged to mate with a compatible coupling member mounting the trackable target to establish a predetermined spatial relationship between said bone clamp and said trackable target;
wherein said coupling member comprises a releasable connection between said target and said bone clamp, to remove said trackable target;
and wherein said connection is capable of re-engaging in a re-engaged position which accurately recaptures said spatial relationship between the bone and said trackable target. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23)
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21. The surgical tool of 20, wherein said sleeve is arranged to slidably engage said dovetailed joint while causing said first and second members to tend toward a centered position;
said sleeve having an interior shape which snugly encloses the exterior shape of said dovetailed joint when said first and complementary members are assembled in a centered position.
Specification