Orthognathic biomechanical simulation
Inventors
MURPHY, RYAN • Basafa, Ehsan • Armand, Mehran • Gordon, Chad • GRANT, Gerald • LIACOURAS, Peter
Assignees
Johns Hopkins University • US Department of Navy • US Department of Defense
Publication Number
US-10631877-B2
Publication Date
2020-04-28
Expiration Date
2034-11-26
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Abstract
Disclosed is a method of simulating mastication. The method includes obtaining computer-readable three-dimensional representations of a first skeletal fragment including a portion of at least one of a mandible and a maxilla and of a recipient skeletal fragment including a portion of at least one of a mandible and a maxilla. The method also includes obtaining placement data and obtaining muscle insertion data. The method also includes simulating a contraction of a muscle positioned according to the muscle insertion data in a representation of a surgical hybrid comprising at least a portion of the first skeletal fragment positioned according to the placement data relative to at least a portion of the recipient skeletal fragment. The method also includes outputting a representation of mastication represented by the simulating.
Core Innovation
The invention relates to a method and system for simulating mastication by obtaining computer-readable three-dimensional representations of donor skeletal fragments or osseointegrative implants and recipient skeletal fragments, which include portions of at least one of a mandible and a maxilla. The method obtains placement data representing the position of the donor fragment or implant relative to the recipient fragment and muscle insertion data. It simulates muscle contraction positioned according to the muscle insertion data in a representation of a surgical hybrid comprising the positioned donor fragment or implant relative to the recipient fragment and outputs a representation of mastication based on the simulation.
The invention further includes tracking the position of the skeletal fragments or implants during surgery, acquiring real-time cephalometric landmark locations, calculating orientation values of the fragments or implants with respect to the recipient skeletal fragment during surgery, and outputting this information in real time. The system allows for obtaining muscle activation data to simulate muscle contractions during mastication accurately. This integrated method and system provide biomechanical simulation and real-time cephalometrics to predict post-operative function, addressing common shortcomings of existing computer-assisted surgery systems.
The problem being solved addresses challenges in craniomaxillofacial surgery, particularly facial transplantation, where donor and recipient skeletal, aesthetic, and dental discrepancies complicate surgical outcomes. Existing computer-assisted surgery systems lack integrated platforms that provide both pre-operative planning and real-time intraoperative feedback, are not designed to handle complex three-dimensional facial skeleton guide placements effectively, and do not offer validated methods for optimizing facial, skeletal, and occlusal inconsistencies or predicting post-operative functional outcomes like mastication. This invention provides a fully integrated solution that combines planning, navigation, dynamic feedback, and biomechanical simulation to improve accuracy, precision, and functional prediction in such surgical scenarios.
Claims Coverage
The patent includes four independent claims related to methods and systems for simulating mastication using three-dimensional skeletal data and real-time tracking during surgery. Four main inventive features can be identified from these claims.
Simulation of mastication using tracked skeletal fragment positioning and cephalometric landmark evaluation
Obtaining 3D representations of donor and recipient skeletal fragments, positioning a tracker to track the donor skeletal fragment during surgery, obtaining placement data from the tracker, real-time acquisition of cephalometric landmarks during surgery, calculating and outputting an orientation value of the donor skeletal fragment relative to the recipient during surgery, obtaining muscle insertion data, simulating muscle contraction in a surgical hybrid model, and outputting mastication simulation.
Simulation of mastication incorporating osseointegrative implant tracking and real-time cephalometrics
Obtaining 3D representations of osseointegrative implants and recipient skeletal fragments, tracking the implant position during surgery, acquiring placement data, calculating and outputting orientation values based on cephalometric landmarks in real time, obtaining muscle insertion data, simulating muscle contraction in the surgical hybrid comprising the implant and recipient fragment, and outputting a mastication representation.
Computer-implemented system for simulation of mastication with real-time tracking and cephalometric analysis
A system comprising electronic memory and processors configured to obtain 3D representations of donor and recipient skeletal fragments, position and use a tracker for surgical fragment tracking during surgery, obtain placement data, receive real-time cephalometric landmarks, calculate and output orientation values during surgery, obtain muscle insertion data, simulate muscle contraction in a surgical hybrid model, and output the mastication simulation.
Computer-implemented system for simulation of mastication with implants and real-time tracking and cephalometric feedback
A system with memory and processors configured to obtain 3D representations of an osseointegrative implant and recipient skeletal fragment, track implant position during surgery, obtain placement data, real-time cephalometric landmark acquisition, orientation calculation and output, obtain muscle insertion data, simulate muscle contraction in a representation of the surgical hybrid, and output mastication simulation.
The independent claims cover methods and systems that integrate real-time tracking of skeletal fragments or implants relative to recipient anatomy during surgery, cephalometric landmark assessment, orientation determination, muscle insertion data acquisition, and biomechanical simulation of mastication with output of results, addressing preoperative planning and intraoperative navigation in orthognathic and craniomaxillofacial surgeries.
Stated Advantages
Provides a fully integrated platform combining pre-operative planning, intraoperative navigation, and real-time feedback including biomechanical simulation and cephalometric data.
Improves accuracy and precision in complex craniomaxillofacial surgeries such as facial transplantation by compensating for donor-to-recipient skeletal mismatches.
Enables real-time intraoperative updates and dynamic assessment to improve surgical outcomes related to facial aesthetics, skeletal alignment, and masticatory function.
Uses patient-specific models and tracking systems to optimize bone fragment placement and implant positioning reducing operative time and need for revision surgeries.
Documented Applications
Craniomaxillofacial surgery including facial transplantation with donor-to-recipient skeletal mismatch.
Orthognathic surgical procedures affecting dental alignment and jaw repositioning.
Implantation of osseointegrative dental and craniofacial implants for function and aesthetics.
Craniomaxillofacial trauma reconstruction involving fracture reduction and fixation.
Neurosurgical procedures requiring real-time tracking and navigation without bulky skull clamps.
Correction of congenital craniofacial deformities and craniosynostosis.
Head and neck facial reconstruction including post-tumor resection and free tissue transfer planning.
Computer-assisted cranioplasty including single-stage customized cranial implant placement and tumor-related skull defect reconstruction.
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