Abstract: The present invention relates to a method for reconstructing a 3D image from 2D X-ray images acquired with an X-ray imaging system, said method comprising the steps of: a) receiving a set of 2D X-ray images of a region of a patient with said X-ray imaging system, b) computing an initial 3D image within the coordinate system of the X-ray imaging system by using at least part of said 2D X-ray images with their respective projective geometry data; c) projecting said initial 3D image on at least part of said 2D X-ray images and adjusting the respective projective geometry data of said images, said adjustment comprising registration of said images with the projection of the initial 3D image using an image-to-image registration technique; d) computing an updated 3D image using the complete set of 2D X-ray images with their respective adjusted projective geometry data.

Abstract: The invention relates to a method for creating a surgical resection plan for treating a pathological deformity of a bone.

Abstract: The invention relates to a surgical navigation device, for the purpose of adjusting a cutting plane to a desired position with respect to a bone of a patient, the device comprising: a fixed part (7) rigidly attached to the bone (18, 19), the fixed part comprising fixation means to rigidly attach a tracker thereto; a mobile part (5) adjustable with respect to the fixed part (7), including fixation means to rigidly attach a tracker thereto, and including a cutting slot (6) in which a saw blade can be inserted to perform cut; a fixed tracker (9) rigidly attached to the fixed part (7); a mobile tracker (1) attached to the mobile part (5). The invention also concerns a method for adjusting a cutting plane of a surgical device to a desired position with respect to a bone of a patient.

Abstract: The present invention relates to a method for reconstructing a 3D image from 2D X-ray images acquired with an X-ray imaging system, said method comprising the steps of: a) receiving a set of 2D X-ray images of a region of a patient with said X-ray imaging system, b) computing an initial 3D image within the coordinate system of the X-ray imaging system by using at least part of said 2D X-ray images with their respective projective geometry data; c) projecting said initial 3D image on at least part of said 2D X-ray images and adjusting the respective projective geometry data of said images, said adjustment comprising registration of said images with the projection of the initial 3D image using an image-to-image registration technique; d) computing an updated 3D image using the complete set of 2D X-ray images with their respective adjusted projective geometry data.

Abstract: A system for guiding resurfacing operations on at least a portion of a joint of at least one bone is provided and uses a guide with actuators (motors) controlled by a computer to position a cutting tool relative to a bone so that the bone surface can be cut in a flexible and accurate manner.

Abstract: Methods and apparatus for integrating an electromagnetic navigation system and a tool and aligning the tool with a target are presented, including a sensor tool, a tool, a field generator, a display, and a computer. The sensor tool attaches to a target component in a unique position relative to target features. The field generator is fixed relative to the tool except in rotation about a tool axis. The display is adjustably mounted to the tool and automatically adjusts image parameters. Target registration and error compensation methods are provided. The system detects magnetic field and signal disturbances that may lead to inaccurate navigation, filters navigation data, and adjusts filtering parameters based on detected conditions. Apparatus for proximally locking an IM nail such that a clear passage through the cannulation of the nail is maintained are provided.

Abstract: The invention relates to a method for non-invasive reproducible determination of a corrected surface on a 3D bone surface model constructed from 3D medical image of a bone having a deformation consisting in a bump overgrowth at the head-neck junction; wherein said corrected surface comprises: i) a 3D spherical corrected surface patch on the head portion of said 3D bone surface model, and ii) a 3D smooth transition corrected surface patch on the neck portion of said 3D bone surface model, contiguous to said 3D spherical corrected surface patch; Said corrected surface patches are defined by a set of parameters comprising: iii) at least one first parameter (a*) representing a spherical extent value of said 3D spherical corrected surface patch, iv) and a set of at least one second parameter, said set determining the 3D correction boundary of said corrected surface patches, such that said corrected surface patches are continuous with said 3D bone surface model along said boundary.

Abstract: The invention relates to a method for constructing a patient-specific surgical guide comprising at least one contact element comprising a contact surface intended to match an anatomical structure to be treated in view of implantation of an implant and at least one guiding element for guiding a surgical instrument to treat said anatomical structure, said method comprising: receiving a non-segmented 3D medical image of the anatomical structure of the patient; determining, in said non-segmented 3D medical image, anatomical references of the patient; based on said anatomical references, positioning an implant model in the non-segmented 3D medical image; adjusting at least one of: a type, a size, a position and an orientation of the implant model with respect to the anatomical structure in the non-segmented 3D medical image; recording planning data including said adjusted type, size, position and orientation of the implant model; using a patient-specific surgical guide adapted to carry out implantation of the i

Abstract: The invention relates to a method for planning a surgical intervention comprising the implantation of an implant in a patient's anatomical structure, comprising: computing at least one pseudo-radiographic image from a 3D image of the anatomical structure, said pseudo-radiographic image being a 2D image wherein each pixel integrates the information of the 3D image along a determined direction of integration, said determined direction of integration depending on the planned position of the implant with respect to the anatomical structure; displaying said at least one pseudo-radiographic image on a display unit; displaying a representation of the implant on said pseudo-radiographic image; updating the pseudo-radiographic image and/or the representation of the implant when the position of the implant is modified.

Abstract: The invention relates to a method for constructing a patient-specific surgical guide comprising at least one contact element comprising a contact surface intended to match an anatomical structure to be treated and at least one guiding element for guiding a surgical instrument to treat said anatomical structure, said method comprising: receiving a 3D medical image of the anatomical structure of the patient; determining, in said 3D medical image, at least one region of interest containing a portion of the external surface of the anatomical structure intended to match a respective contact element of the surgical guide; segmenting the 3D medical image in said determined region of interest so as to locally reconstruct the external surface of the anatomical structure; computing the contact surface of the contact element from said reconstructed local surface of the anatomical structure; constructing the at least one contact element to include the contact surface.

Abstract: The invention relates to a method for creating a surgical resection plan for treating a pathological deformity of a bone.

Abstract: The present invention relates to a method for reconstructing a 3D image from 2D X-ray images acquired with an X-ray imaging system, said method comprising the steps of: a) receiving a set of 2D X-ray images of a region of a patient with said X-ray imaging system, b) computing an initial 3D image within the coordinate system of the X-ray imaging system by using at least part of said 2D X-ray images with their respective projective geometry data; c) projecting said initial 3D image on at least part of said 2D X-ray images and adjusting the respective projective geometry data of said images, said adjustment comprising registration of said images with the projection of the initial 3D image using an image-to-image registration technique; d) computing an updated 3D image using the complete set of 2D X-ray images with their respective adjusted projective geometry data.

Abstract: A system for guiding resurfacing operations on at least a portion of a joint of at least one bone is provided and uses a guide with actuators (motors) controlled by a computer to position a cutting tool relative to a bone so that the bone surface can be cut in a flexible and accurate manner.

Abstract: The invention relates to a method for optimally visualizing a morphologic region of interest of a bone in an X-ray image of a patient, comprising:—receiving a set of 3D medical images of the bone,—creating a 3D bone model of at least part of the bone comprising said region of interest from said set of 3D images,—determining a criterion representative of a visualization of the extent of said morphologic region of interest,—automatically determining from the 3D bone model optimal relative bone and X-ray orientation so as to optimize said criterion for said patient,—creating at least one virtual X-ray image of the bone from said set of 3D images according to said optimal relative bone and virtual X-ray orientation.

Abstract: The invention relates to a system for positioning a surgical device, said surgical device comprising: a base (1) designed to be held in a user's hand, an end-effector (2) for mounting a surgical tool, respectively a guide (20) for guiding a surgical tool (3), said surgical tool being designed to treat a planned volume of a part (P1) of a patient's body, an actuation unit (4) connected to said base (1) and said end-effector (2) for moving said surgical tool (3), respectively tool guide (20), with respect to the base (1) in order to treat said planned volume, said positioning system comprising: (i) a tracking unit (200) configured to determine in real time the pose of at least one of the tool (3), the end-effector (2) and the base (1) with respect to the part to be treated, (ii) a control unit (300) configured to: (a) compute in real time the working space of the surgical tool for said determined pose, (b) compute in real time the volume that remains to be treated to achieve the treatment of the planned v

Abstract: The invention relates to a surgical system comprising: (i) a handheld device (100) comprising: a base (1), an end-effector (2) for mounting a surgical tool or tool guide, an actuation unit (4) connected to said base (1) and end-effector (2), a support unit (5) designed to make contact with the treated part to be treated or an adjacent region to provide a partial mechanical link between the base (1) or end-effector (2), and the part to be treated, (ii) a tracking unit (200), (iii) a control unit (300) configured to: (a) compute in real time an optimized path of the end-effector, (b) detect whether said computed path of the tool or end-effector can be achieved without changing the pose of the base, and, if not, determine a possible repositioning of the base with respect to the part to be treated, (c) configure the actuation unit so as to move the end-effector according to said computed path, and (d) iterate steps (a) to (c) until the planned volume has been treated, (iv) a user interface (400).

Abstract: Method of determination of access areas from 3D patient images The invention relates to a method for automatically determining at least one pre-operative portal for arthroscopy from acquired pre-operative medical images of a bone of a patient, the method comprising the following steps: i) constructing a 3D surface(S) of the bone from the 3D image of the bone; ii) determining anatomical landmarks of the bone from the 3D surface; iii) determining a bone reference coordinate system (Rbone); iv) selecting at least one predetermined portal in a database of positions of predetermined portals; v) determining a transform between the bone reference coordinate system (Rbone) and the model coordinate system (Ratlas) so that the bone of the patient and the bone of the reference person are matched in size, in position and/or shape; vi) inferring from the transform and the at least one predetermined portal the pre-operative portal.

Abstract: The present application provides an apparatus and method for determining a position of a joint prosthesis using a computer assisted orthopedic surgery system in support of an arthroplasty surgery. The apparatus and method includes attaching a first locatable element to a first bone on one side of a joint, providing a sensor having a second locatable element and moving the sensor in proximity of the joint to locate a plurality of positions of the sensor relative to the first locatable element using a tracking devise. The apparatus and method further includes selecting a generic model of a joint, determining the generic model in response to the plurality of positions located using the tracking device to generate a deformed model, determining a position for a joint prosthesis on the deformed model, and outputting on a display the determined position upon the deformed model.

Abstract: A computer assisted orthopedic surgery system for ligament graft reconstruction includes a system for obtaining data indicative of a location for ligament graft placement with respect to at least a first bone and a second bone. The system includes a position determining device that is capable of tracking the relative movements of the first and second bones using reference bodies that are attached to the first and second bones and a pointer that has a tip for contacting a surface of at least one of the first and second bones to capture one or more reference points. The system further includes a computer that is configured to determine and track intraoperative positions of the reference bodies and the pointer and to provide isometric and impingement data for a ligament graft placement based on a realistic simulation of a trajectory of a deformable ligament graft.

Abstract: The present invention relates to a surgical navigation device, for the purpose of adjusting cutting planes to a desired position with respect to a bone of a patient, the device comprising: an adjustable guide (15) that contains several adjustable screws (1) that create contact points with the surface of the bone or cartilage such that the guide fits to the bone in a unique position calculated such that the holes and cutting blocks of the adjustable guide fit with the position planned on preoperative CT or MR images of the patient, a dedicated screwdriver (7) to adjust automatically the screws (1) to their target length, a navigation system used to check the correct position of the adjustable guide with respect to essential anatomical points and if necessary means to correct the positions of the adjustable screws.