Systems and methods for accurate determination of the position of an anatomic part of a subject in robotic assisted image-based surgery, using an inertial measurement unit (IMU) to determine the position and orientation of the anatomical part of the subject. The intrinsic drift of the IMU, which would make the IMU position measurements inaccurate, can be reset to zero regularly, at points of time when the subject's body is stationary. This can be achieved when motion from the subject's breathing and from the heartbeat are essentially zero. Such positions occur respectively when the respiratory signal shows the position of the breathing cycle to be at the end of the expiration phase, and the heartbeat signal represents a time in the diastole period of the subject's electrocardiographic cycle. When these two signal moments coincide, the IMU is essentially stationary, and its drift reset to zero.

A medical implant device such as, for example, an intramedullary (IM) nail including an improved sensing device for monitoring the progression of fracture healing in a patient is disclosed. In one embodiment, a medical implant device for attachment to a portion of a bone may include at least one energy-harvesting strain sensor operative to generate a charge responsive to a strain force on the medical implant device, and at least one electronic element configured to receive at least a portion of the charge, the at least one electronic element comprising a telemetry device operably coupled to the at least one energy-harvesting sensor, the telemetry device powered, at least in part, by the at least a portion of the charge to transmit sensor information associated with the charge to a receiver device. Other embodiments are described.

A system for subcutaneously injecting and anchoring a subcutaneous device to a muscle, a bone, and/or a first tissue of a patient, the subcutaneous device including a housing and a clip configured to anchor the subcutaneous device to the muscle, the bone, and/or the first tissue, includes a first surgical instrument and an insertion device. The first surgical instrument includes a first handle and a first dilation portion extending from the first handle. The first dilation portion has a first length and a first width and is configured to spread a second tissue through which the subcutaneous device is to be inserted. The insertion device is configured for insertion through the second tissue spread by the first surgical instrument. The insertion device includes an insertion handle and an insertion portion extending from the insertion handle and being configured to releasably hold the subcutaneous device to implant the subcutaneous device for anchoring to the muscle, the bone, and/or the first tissue.

A subcutaneously implantable device includes a housing, a clip attached to the housing that is configured to anchor the device to a muscle, a bone, and/or a first tissue, and circuitry in the housing that is configured to provide monitoring, therapeutic, and/or diagnostic capabilities with respect to an organ, a nerve, the first tissue, and/or a second tissue. The circuitry includes a first power source, and a transceiver. A first antenna on the device is in electrical communication with the first power source. The first antenna is configured to be subcutaneously positioned in a patient. A second antenna on the device is in electrical communication with the transceiver. The second antenna is configured to be subcutaneously positioned in the patient.

A method of subcutaneously injecting and anchoring a device to a bone, a muscle, and/or a first tissue in a patient, the device having a clip configured to anchor the device to the bone, the muscle, or the first tissue, includes making an incision in the patient; inserting and advancing a first surgical instrument that spreads a second tissue to form a tunnel therein; inserting an insertion device loaded with the device through the incision; advancing the insertion device through the tunnel to the bone, the muscle, and/or the first tissue upon which the device is to be anchored; and anchoring the device to the bone, the muscle, and/or the tissue using the clip on the device

Disclosed herein are joint implants and methods for tracking joint implant performance. A method for monitoring a joint implant performance may include coupling a first implant to a first bone of a joint, the first implant including at least one magnetic marker. Coupling a second implant to a second bone of the joint, the second implant including at least one magnetic sensor to detect a position of the magnetic marker. Performing a first joint stress test to measure a baseline joint stability value, the baseline joint stability value being generated by the at least one magnetic sensor. Performing a second joint stress test to measure a second joint stability value, the second joint stability value being generated by the at least one magnetic sensor. Determining joint stability of the joint by comparing the baseline joint stability value to the second joint stability value.

This disclosure relates to an adjustable tibial sizer for use in knee arthroplasty, the sizer includes a two-part body comprising: a first body portion, a second body portion, and a connection element extending therebetween. Each of the first and second body portions includes a ramp surface configured for simultaneous movement of the first body portion relative to the second body portion in an anterior-posterior direction and a medial-lateral direction, and method of use thereof.

A wireless system comprising a first wireless device and a second wireless device. The first wireless device is configured to operate with less than 15 milliamperes of current. The second wireless device has an internal power source and is configured to transmit one or more radio frequency signals to the first wireless device. The first wireless device is configured to receive the one or more radio frequency signals from the second wireless device. The first wireless device is configured to harvest energy from the one or more radio frequency signals. The first wireless device is enabled for operation after a predetermined amount of energy is harvested from the one or more radio frequency signals. A communication handshake occurs between the first and second wireless devices to indicate that the first wireless device is in communication with the second wireless device. The first wireless device is configured to perform at least one task from harvested energy.

Implants or sensors often include and rely on inductive and ferromagnetic electrical components to measure and communicate data outside of the body to an external device, creating a safety concern when a patient with these implants or sensors must undergo an MRI scan. Further, various external devices that include inductive and ferromagnetic electrical components are exposed to potentially damaging MRI scans. An electrical coil assembly can include an electrical coil that includes a substrate and an electrical conductor supported by a first face of the substrate. In an example, the electrical coil assembly further includes a fuse element that is configured to move from a disengaged position in which the electrical fuse conductor is out of contact with the electrical conductor to an engaged position in which the electrical fuse conductor contacts the electrical conductor so as to define a short circuit.

A CAS system and method for guiding an operator in inserting a femoral implant in a femur as a function of a limb length and orientation of the femoral implant with respect to the femur, comprising a reference tool for the femur, a registration tool, a bone altering tool and a sensing apparatus. A controller is connected to the sensing apparatus to: i) register a frame of reference of the femur by calculating surface information provided by the registration tool as a function of the position and orientation of the registration tool provided by the sensing apparatus, and/or retrieving in a database a model of the femur; ii) calculate a desired implant position with respect to the frame of reference as a function of the limb length; and iii) calculate a current implant position and orientation in relation to the desired implant position with respect to alterations being performed in the femur with the bone altering tool, as a function of the position and orientation of the bone altering tool provided by the sensing apparatus and of a digital model of a femoral implant provided by the database. The database is connected to the controller for the controller to store and retrieve information relating to an operation of the controller. The computer-assisted system may be used to guide an operator in inserting a pelvic implant in an acetabulum as a function of an orientation of the pelvic implant with respect to the pelvis.