HMD Surgical Navigation Registration for Bone Model Alignment
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Solution Overview
Problem
Surgical navigation systems face challenges with cumbersome registration processes and misalignment issues when integrating head-mounted displays (HMDs), leading to awkward visualization for surgeons during surgeries.
Innovation Solution
A system and method for registering a head-mounted display (HMD) coordinate system with a surgical navigation localizer coordinate system using registration markers and sensors, allowing for precise alignment and error indication through virtual and real calibration markers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a display is used for surgical navigation visualization, then the surgeon can see the relative positions and orientations of surgical tools and anatomy, but the display is located remotely from the surgical site and the view is not aligned with the surgeon's point of view, making the visualization awkward
Solution Approach 1:
The patent transitions from a traditional remote display to a head-mounted display that presents visualization in the surgeon's field of view. By moving the display from a separate spatial location to being integrated with the surgeon's vision through HMD technology, the system eliminates the need to switch gaze between display and surgical site, directly resolving the contradiction between visualization accuracy and operational comfort.
Solution Approach 2:
The head-mounted display acts as an intermediary device that bridges the gap between the surgical navigation system and the surgeon's natural viewpoint. The HMD overlays or presents navigational information directly in the surgeon's visual field, serving as a mediator that combines the benefits of precise visualization with natural surgical observation without requiring the surgeon to look away at a remote display.
2Adaptability or versatility
If head-mounted displays are integrated into surgical navigation systems, then mixed reality visualization can be provided, but the registration process becomes more complex requiring registration of HMD, surgical tools, and anatomy to the common coordinate system
Solution Approach 1:
The patent combines multiple registration functions into a unified process. The HMD and surgical navigation system share a common coordinate system framework, allowing registration of the HMD, surgical tools, and anatomy to be performed within the same computational space. This merging of registration processes reduces the overall complexity compared to treating them as separate systems requiring independent calibration.
Solution Approach 2:
The surgical navigation system is designed with universal registration capabilities that can handle multiple objects (HMD, surgical tools, anatomy) within a single common coordinate system. This multi-functional registration approach allows the system to adapt to different registration scenarios without requiring separate specialized procedures for each device, thereby managing complexity while maintaining versatility.
3Device complexity
If registration is performed with little visualization assistance in traditional systems, then the process is simple, but registration becomes cumbersome and difficult to quickly verify
Solution Approach 1:
The head-mounted display provides real-time visual feedback during the registration process. As the surgeon performs registration operations, the HMD displays the current alignment status, coordinate system relationships, and registration progress directly in the surgeon's field of view. This immediate feedback allows the surgeon to quickly verify registration accuracy without removing gloves or seeking external visual confirmation, reducing verification time while maintaining process simplicity.
Data Source
AI summary
Surgical systems and methods for co-registering a virtual bone model and a physical bone involve a navigation system with a localizer to detect markers of a probe to track positions of the probe tip and a head-mounted device (HMD). The HMD enables the user to observe a real-world view of the physical bone and the probe on, or through, the HMD display. Controller(s) provide, on the HMD display, virtual landmarks combined with the real-world view of the physical bone, the landmarks being defined at virtual locations associated with the virtual bone model. The controller(s) capture, with the navigation system, positions of the probe tip in response to the probe tip contacting the surface of the physical bone at physical locations corresponding to the virtual locations of the landmarks. The controller(s) utilize the captured positions of the probe tip to co-register the virtual model bone and the physical bone.