Method for designing a registration instrument for osteosynthesis and a system comprising the registration instrument
Inventors
FÜRNSTAHL, Philipp • NAGY, Ladislav • Schweizer, Andreas
Assignees
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Publication Number
US-12056834-B2
Publication Date
2024-08-06
Expiration Date
Abstract
The invention relates to a method for designing a patient-specific registration instrument for use in osteotomies and a surgical tool system comprising a registration instrument and an osteosynthesis plate.
Core Innovation
The surgical tool system registers a fractured bone fragment in a predefined healing position using first and second contact surfaces that are inverse surfaces of portions of the fragment and meet along an edge. A guiding channel provides guidance to a surgical tool for drilling pilot holes at predefined orientations and positions into the fractured bone fragment.
The system includes an osteosynthesis plate with openings corresponding to the positions and orientations of the pilot holes when the fragments are repositioned in the predefined healing position. A post-registration instrument aligns the fragments and the plate, while its centering channels receive surgical pins to center them with respect to the plate openings based on a three-dimensional bone model.
Claims Coverage
The independent claim covers a surgical tool system for osteosynthesis of a fractured bone comprising four inventive features.
Inverse contact surfaces for fragment registration
The registration instrument has first and second contact surfaces that are inverse surfaces of first and second surface portions of a fractured bone fragment and meet along an edge, for registering the fragment in a predefined healing position.
Guiding channel for pilot holes
At least one guiding channel provides guidance to a surgical tool for drilling pilot holes at predefined orientations and positions into a bone fragment.
Osteosynthesis plate openings corresponding to pilot holes
The osteosynthesis plate rigidly fixes the fragments together in a predefined healing position and has openings for receiving surgical tools that correspond to the positions and orientations of the pilot holes when the fragments are repositioned.
Post-registration alignment with pin-centering channels
The post-registration instrument aligns the fragments with the osteosynthesis plate and aligns the pilot-hole positions with the centers of the plate openings. Its centering channels receive surgical pins attached to different fragments and center the pins with respect to the openings.
Claim 1 combines fragment registration through inverse contact surfaces and pilot-hole guidance with plate openings corresponding to the pilot holes and a post-registration instrument that aligns the fragments, plate, and surgical pins.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Osteosynthesis of a fractured bone, including rigidly fixing bone fragments together in a predefined healing position.
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