Surgical measurement systems and methods
First Claim
1. A system comprising:
- A first measurement tool comprising;
A registration interface configured to be coupled to a first bone portion to limit relative translation between the registration interface and the first bone portion along three nonparallel directions, wherein the registration interface comprises a bore having a noncircular shape configured to restrict relative rotation between the registration interface and the first bone portion;
A contact feature positionable in contact with a bony landmark;
A displacement structure that couples the contact feature to the registration interface such that the contact feature is translatable with respect to the registration interface along three nonparallel axes to indicate displacements between the registration interface and the bony landmark along each of the nonparallel axes, wherein the displacement structure comprises;
At least one sliding joint;
At least one rod comprising a stop feature configured to prevent accidental withdrawal of the rod from the sliding joint;
Wherein the stop feature comprises an intrinsic spring integrally formed with an end of the rod; and
A frame attachable directly to the first bone portion such that the frame abuts the first bone portion, the frame comprising a post insertable into the bore to couple the registration interface to the first bone portion.
5 Assignments
0 Petitions
Accused Products
Abstract
A measurement tool is designed to measure the relative displacements between two bony landmarks of a spine, such as pedicles and facet surfaces. The measurement tool may have a registration interface designed to be registered to a first bony landmark, and a contact feature shaped to contact a second bony landmark. The registration interface may be registered to a frame rigidly coupled relative to the first bony landmark. The measurement tool also has a displacement structure that permits motion of the contact feature relative to the registration interface along multiple dimensions. The displacement structure may have two or three sliding joints that enable relative translation along orthogonal axes. Each sliding joint may have a rod with a plurality of markings that can easily be read to acquire measurements from the displacement structure.
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Citations
23 Claims
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1. A system comprising:
A first measurement tool comprising; A registration interface configured to be coupled to a first bone portion to limit relative translation between the registration interface and the first bone portion along three nonparallel directions, wherein the registration interface comprises a bore having a noncircular shape configured to restrict relative rotation between the registration interface and the first bone portion; A contact feature positionable in contact with a bony landmark; A displacement structure that couples the contact feature to the registration interface such that the contact feature is translatable with respect to the registration interface along three nonparallel axes to indicate displacements between the registration interface and the bony landmark along each of the nonparallel axes, wherein the displacement structure comprises; At least one sliding joint; At least one rod comprising a stop feature configured to prevent accidental withdrawal of the rod from the sliding joint; Wherein the stop feature comprises an intrinsic spring integrally formed with an end of the rod; and A frame attachable directly to the first bone portion such that the frame abuts the first bone portion, the frame comprising a post insertable into the bore to couple the registration interface to the first bone portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
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a measurement tool comprising; a registration interface configured to be coupled to a first bone portion to limit relative translation between the registration interface and the first bone portion along three nonparallel directions, wherein the registration interface comprises a bore having a noncircular shape configured to restrict relative rotation between the registration interface and the first bone portion in response to coupling of the registration interface to the first bone portion; a contact feature positionable in contact with a bony landmark; and a displacement structure that couples the contact feature to the registration interface such that the contact feature is movable with respect to the registration interface along three orthogonal axes to indicate displacements between the registration interface and the bony landmark along each of the three orthogonal axes; and a frame attachable directly to the first bone portion such that the frame abuts the first bone portion, the frame comprising a post insertable into the bore to couple the registration interface to the first bone portion. - View Dependent Claims (10, 11, 12)
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13. A system comprising:
A first measurement tool comprising; A registration interface configured to be coupled to a first bone portion to limit relative translation between the registration interface and the first bone portion along three nonparallel directions, wherein the registration interface comprises a bore having a noncircular shape configured to restrict relative rotation between the registration interface and the first bone portion; A contact feature positionable in contact with a bony landmark; A displacement structure that couples the contact feature to the registration interface such that the contact feature is movable with respect to the registration interface to indicate displacements between the registration interface and the bony landmark along at least two axes, wherein the displacement structure comprises; At least one sliding joint; At least one rod comprising a stop feature configured to prevent accidental withdrawal of the rod from the sliding joint; Wherein the stop feature comprises an intrinsic spring integrally formed with an end of the rod; and A frame attachable directly to the first bone portion such that the frame abuts the first bone portion, the frame comprising a post insertable into the bore to couple the registration interface to the first bone portion. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A system comprising:
A measurement tool comprising; A registration interface configured to be coupled to a first bone portion on a first vertebra of a spine to limit relative translation between the registration interface and the first bone portion along three nonparallel directions, wherein the registration interface comprises a bore having a noncircular shape configured to restrict relative rotation between the registration interface and the first bone portion; A contact feature positionable in contact with a bony landmark on a bone selected from a group consisting of the first vertebra and a second vertebra adjacent to the first vertebra; A displacement structure that couples the contact feature to the registration interface such that the contact feature is movable with respect to the registration interface to indicate displacements between the registration interface and the bony landmark along at least two mutually perpendicular axes; A frame attachable directly to the first bone portion such that the frame abuts the first bone portion, the frame comprising a post insertable into the bore to couple the registration interface to the first bone portion; and At least two prostheses shaped to replace two natural facets of a vertebra selected from the group consisting of the first vertebra and the second vertebra; and
a cross-linking member attachable to the prostheses to couple the prostheses together substantially symmetrically across a sagittal plane of a patient.- View Dependent Claims (21, 22, 23)
Specification