According to some embodiments, systems and methods of ultrasonic detection of implantable medical device distraction are provided. The system includes a first elongate member and a second elongate member. The first elongate member has a first end that is configured to be attached to a first location on the skeletal system of a subject, a second end, and at least one landmark identifiable using ultrasound. The second elongate member has a first end that is movably coupled to the second end of the first elongate member, a second end configured to be attached to a second location on the skeletal system, and at least one landmark identifiable using ultrasound. Movement of the first elongate member in relation to the second elongate member causes a corresponding movement of the at least one first landmark in relation to the at least one second landmark which can be detected using ultrasound.

An implantable osteodistraction device includes an inductive power transfer circuit at least partially within one of outer and inner tubes. A shape-memory-alloy actuator includes a shape-memory-alloy element powered by the inductive power transfer circuit and configured to transition from a first phase to a second phase with a corresponding change in shape responsive to threshold resistive heating. A force transmission apparatus includes a locking clutch connected to the shape-memory-alloy actuator and slidably connected to another one of the outer and inner tubes. The locking clutch converts change in shape of the shape-memory-alloy element, by transition from one of the first and second phases to the other one of the first and second phases, to an extension of the inner tube from within the outer tube and prevents contraction of the inner tube into the outer tube when the shape-memory-alloy element oppositely transitions.

An implantable bone elongation device including an inner rod defining an internal cavity housing a rotational actuator having an output shaft connected to a lead screw disposed at the end of the inner rod and in threaded engagement with a threaded inner surface of an outer rod. Rotation of the lead screw converts rotation motion into linear motion resulting in telescopic movement of the outer rod relative to the inner rod. Rotational motion is converted into linear motion by components disposed in a parallel configuration thereby minimizing the overall length of the bone elongating device while maintaining a maximum stroke length. In various embodiments, additional components, such as electronic circuit boards, electrical power supply or battery power source, may be housed within the internal cavity formed by the inner rod. The bone elongation device of the present invention may be affixed to a bone in a variety of configurations including implantation into a medullary cavity of the bone, attached to an outer surface of the bone, or attached to the bone as an extramedullary plate.

A bone transport system includes a nail having a proximal end and a distal end, the proximal end configured for securing to a first portion of bone, the distal end configured for securing to a second portion of bone. The system includes a housing having a wall with a longitudinal opening extending a length along a portion thereof The system further includes a transport sled having a length that is shorter than the length of the longitudinal opening, the transport sled configured for securing to a third portion of bone, the transport sled further configured to be moveable along the longitudinal opening. The system further includes a magnetic assembly disposed within the nail and configured to be non-invasively actuated by a moving magnetic field, wherein actuation of the magnetic assembly moves the transport sled along the longitudinal opening. The system further includes a ribbon extending on opposing sides of the transport sled and substantially covering the longitudinal opening.

According to some embodiments, systems and methods are provided for non-invasively detecting the force generated by a non-invasively adjustable implantable medical device and/or a change in dimension of a non-invasively adjustable implantable medical device. Some of the systems include a non-invasively adjustable implant, which includes a driven magnet, and an external adjustment device, which includes one or more driving magnets and one or more Hall effect sensors. The Hall effect sensors of the external adjustment device are configured to detect changes in the magnetic field between the driven magnet of the non-invasively adjustable implant and the driving magnet(s) of the external adjustment device. Changes in the magnetic fields may be used to calculate the force generated by and/or a change in dimension of the non-invasively adjustable implantable medical device.

An external actuation device includes a housing, a motor, a driving magnet, a sensor, and a controller. The motor includes a driveshaft that is rotatable about a rotation axis. The driving magnet is rotatably coupled with the driveshaft and is rotatable together with the driveshaft about the rotation axis. The sensor is associated with the driving magnet and is configured to detect a magnetic force between the driving magnet and a driven magnet disposed adjacent to the driving magnet. The controller is in communication with the motor and the sensor.

An external magnetic actuator for use in adjusting an implantable medical device having a magnetically actuatable rotatable portion, such as an intramedullary (EVI) lengthening nail is disclosed. The actuator may include a magnet having opposite major surfaces representing opposite poles of the magnet. The magnet may be contained within an actuator body having first and second handles coupled to first and second opposing side walls of the housing. The actuator body may also include one or more projections operable to prevent first and/or second walls of the actuator body from lying flat against an external planar surface. Also provided are various kits and systems that include a disclosed external magnetic actuator and methods for using the disclosed external magnetic actuator.

A bone lengthening system for tumor prostheses includes a prosthesis, wherein the prosthesis includes an internal battery arranged for a wireless charging; the bone lengthening system further includes an extendable mechanism connected to the prosthesis and the extendable mechanism is arranged to be lengthened for, when in use, bringing a length of a limb provided with the prosthesis to a value corresponding to a length of a healthy limb based on healthy limb length data.

A spinal distraction system includes a distraction rod having a first end and a second end, the first end being configured for affixation to a subject's spine at a first location, the distraction rod having a second end containing a recess having a threaded portion disposed therein. The system further includes an adjustable portion configured for affixation relative to the subject's spine at a second location remote from the first location, the adjustable portion comprising a housing containing a magnetic assembly, the magnetic assembly affixed at one end thereof to a lead screw, the lead screw operatively coupled to the threaded portion. A locking pin may secure the lead screw to the magnetic assembly. An O-ring gland disposed on the end of the housing may form a dynamic seal with the distraction rod.

A system for varying distance between bone segments comprises an intramedullary nail (100) and a driving shaft (210). The intramedullary nail (100) comprises a head (110) attached relative to a first bone segment (410); a housing (120) attached with the head (110); a rotational to linear motion convertor mechanism (140) having an input part and an output part (160); and a transmission (130) having an input member (131) & an output member (133), operatively coupled with input part (150) of rotational to linear motion convertor mechanism (140) and configured to transmit rotational motion and power at an angle. Further, at least a portion of the rotational to linear motion convertor mechanism (140) is contained in the housing (120) and the output part (160) is attached relative to a second bone segment (420). Additionally, the driving shaft (210) is configured to detachably connect with an input member (131) of the transmission.