Abstract:
A computer-assisted surgery system comprises a first surgical device with a tracking unit tracked during a surgical procedure and adapted to perform a first function associated to the surgical procedure. A second surgical device is adapted to perform a second function associated to the surgical procedure. A triggered unit is triggered when the first surgical device and the second surgical device reach a predetermined proximity relation. A surgical procedure processing unit tracks the first surgical device. A trigger detector detects a triggering of the triggered unit. A CAS application operates steps of a surgical procedure. A controller commands the CAS application to activate a selected step associated with the second function in the surgical procedure when the trigger detector signals a detection. An interface displays information about the selected step in the surgical procedure.
Abstract:
A system for measuring a length variation between body portions in computer-assisted surgery between a preoperative condition and intra- or post-operative condition comprises a a rangefinder configured to measure its distance to at least one reference landmark on at least a first body portion of a patient from a known position relative to a second body portion. A support includes joint(s) allowing one or more rotational degree of freedom of movement of the rangefinder to point to the at least one reference landmark. An inertial sensor unit is connected to the rangefinder to produce orientation data for the rangefinder. A computer-assisted surgery processing unit has a tracking module for tracking the rangefinder in a virtual coordinate system using the orientation data, a coordinate system module for determining coordinates in the virtual coordinate system of the at least one reference landmark using the distance and the orientation data, and a length calculation module for measuring a length between the body portions using the coordinates, the length calculation module calculating and outputting the length variation between the body portions by using said length obtained from a preoperative condition and said length obtained from an intra- or post-operative condition. A method for measuring a length variation between body portions in computer-assisted surgery between a preoperative condition and intra- or post-operative condition is also provided.
Abstract:
A computer-assisted surgery system for outputting at least one of a leg length discrepancy and an offset between a preoperative leg condition and a post-implant rejointing leg condition comprises instruments. An inertial sensor unit is connected to one of the instrument, the inertial sensor unit producing readings representative of its orientation. A computer-assisted surgery processor unit operating a surgical assistance procedure and comprises a coordinate system module for setting a pelvic coordinate system from readings of the at least one inertial sensor unit when the at least one instrument is in a given orientation relative to the pelvis, a tracking module for tracking an orientation of the at least one instrument relative to the pelvic coordinate system during movements thereof using the readings from the inertial sensor unit on the instrument, and a geometrical relation data module for recording preoperatively a medio-lateral orientation of the at least one instrument representative of a medio-lateral axis of the legs relative to the pelvic coordinate system and a distance between the legs along the medio-lateral axis, for recording after implant rejointing the medio-lateral orientation and said distance, and for calculating at least one of a leg length discrepancy and an offset, based on said distances and said medio-lateral orientations. An interface outputs at least the leg length discrepancy or the offset between the preoperative leg condition and the post-implant rejointing leg condition.
Abstract:
An impactor for positioning and inserting an acetabular cup into an acetabulum of a pelvis during hip arthroplasty is described. The impactor includes a guide element mounted to an elongated body and including first and second openings aligned with each other to define an axial passage. The first and second openings and the axial passage receive a guide pin therethrough that is pinned in a fixed position to the pelvis. The guide element provides a mechanical orientation guide which restricts an angular orientation of the impactor relative to the guide pin when the guide pin is pinned in the fixed position relative to the pelvis and received through the first and second openings of the guide element. Centering the openings of the guide element relative to the guide pin in the fixed position accordingly achieves a desired orientation of the impactor within a predetermined angular tolerance.
Abstract:
A pin placement instrument for placing a pin in a bone comprises an anatomical interface with a hook-like portion being opened in a lateral direction of the instrument to receive a bone therein in a planned position. A drill guide is connected to the anatomical interface and defining at least one guide slot in a longitudinal direction of the instrument. The guide slot has a lateral opening over its full length in the drill guide to allow lateral withdrawal of the instrument in said lateral direction with the pin placed in the bone passing through the lateral opening. A bushing is removably placed in said guide slot via said longitudinal direction in a planned fit, the bushing defining a throughbore aligned with the guide slot and adapted to receive the pin extending in said longitudinal direction when the bushing is in the guide slot for pin placement.
Abstract:
A method for assisting in positioning the acetabular cup comprises orienting a cup positioning instrument with a cup thereon in an initial reference orientation relative to an acetabulum of a pelvis with the cup forming a joint with the acetabulum, the cup positioning instrument comprising an inertial sensor unit with pre-planned orientation data for a desired cup orientation based on at least one landmark of the pelvis, The cup positioning instrument is rotated to a desired abduction angle as guided by an interface of the cup positioning instrument, based on movements relative to at least one landmark. The cup positioning instrument is rotated to a desired anteversion angle as guided by the interface of the cup positioning instrument, based on movements relative to the at least one landmark. Upon reaching the desired cup orientation as indicated by the interface, the cup is impacted into the acetabulum.
Abstract:
A computer-assisted surgery system for guiding alterations to a bone, comprises a trackable member secured to the bone. The trackable member has a first inertial sensor unit producing orientation-based data. A positioning block is secured to the bone, and is adjustable once the positioning block is secured to the bone to be used to guide tools in altering the bone. The positioning block has a second inertial sensor unit producing orientation-based data. A processing system providing an orientation reference associating the bone to the trackable member comprises a signal interpreter for determining an orientation of the trackable member and of the positioning block. A parameter calculator calculates alteration parameters related to an actual orientation of the positioning block with respect to the bone.
Abstract:
A system for calculating a position and orientation of an acetabular cup in computer-assisted surgery comprises a first trackable reference secured to a pelvis, with a frame of reference being associated with the first trackable reference. A device is positionable between a femoral neck and the acetabulum of the pelvis in a known relation, the device having a second trackable reference. Sensors track the trackable references for position and orientation. A position/orientation calculator calculates a position and orientation of the frame of reference and of the device and for determining an orientation of the neck axis with respect to the frame of reference from the known relation at a desired position of the femur. An implant position/orientation calculator provides cup implanting information with respect to the orientation of said neck axis as a function of the tracking for position and orientation of at least the first trackable reference.
Abstract:
A patient specific instrument (PSI) surgical guide and method for producing same is described. The method includes: obtaining imagery of at least a portion of a patient, and determining one or more surgical targets in the tissue; planning at least a trajectory of the surgical procedure based on a determined surgical target within the tissue; performing segmentation of the imagery; creating a three-dimensional model of the PSI surgical guide, the PSI surgical guide being customized in size and shape and configured to fit on the specific patient. The PSI surgical guide is then produced to correspond to the modeled PSI surgical guide. The PSI surgical guide has a guide element positioned and oriented to guide a surgical implement along the planned trajectory toward the determined surgical target in the tissue.
Abstract:
A computer system and a method for performing a computer assisted surgery uses an expert system driven graphical user interface (GUI) that displays a series of visual display screens that provide information related to respective steps required to perform the surgery. The system displays virtual images of surgical instruments used during the surgery, as well as computer enhanced images of the implant site to assist the surgical team during instrument calibration, implant site planning, implant site preparation, and implant installation.