A medical apparatus having a control device, the control device being designed to store a target current demand in accordance with requirements of a drive of the medical apparatus, and to determine a minimum current demand corresponding to a minimum requirement of the drive of the medical apparatus during a current operation and, based on the minimum current demand, to adapt a maximum value of the target current demand for the current operation of the medical apparatus, said maximum value being provided to limit the current.

A replaceable battery unit for a surgical power tool and a method of operating a surgical power tool including the replaceable battery unit. The replaceable battery unit includes a housing containing one or more battery cells, a motion sensor unit, and a controller. The controller is operable to determine, from an output of the motion sensor unit, a sudden movement of the replaceable battery unit indicative of a kickback event of the surgical power tool. The controller is also operable, in response to the determination, to disconnect power from the replaceable battery unit to the surgical power tool.

A drill for driving a drill bit into a solid object such as bone. The drill includes a rotor with a bore that transmits rotational movement to the drill bit. The drill bit extends through the rotor bore. A probe extends forward from the drill to measure bore depth. The probe is moveably mounted to the drill so as to extend into the rotor bore. As the drill and drill bit advance forward the probe remains static. As a result of the advancement of the drill the rotor extends over the proximal end of the probe.

Disclosed is an assembly for holding a tool. The assembly may selectively reduce and/or eliminate vibrations received and felt by a user. Reducing vibrations may reduce or eliminate chatter at a working end of a tool.

A surgical guidance device is cannulated for passage of a guidewire or pin and includes a hand grip and differential control assembly for driving the guidewire or pin and differentially driving a screw, such as but not limited to a pedicle screw, into bone. The differential control assembly resides in a housing, and includes a differential control assembly for gripping and locking or releasing the guidewire or pin and effecting directional movement (relative to the user holding the surgical guidance device) either distally into the bone or proximally away from bone to thereby drive or retract the guidewire. The differential control assembly also allows distal or proximal drive of a screw, such that one or both the guidewire and screw can be passed proximally or distally alone or together.

A handheld surgical system includes an instrument, a depth measurement attachment, and a controller. The instrument includes a housing and a motor that is positioned within the housing. The depth measurement attachment is removably coupled to the instrument. The depth measurement attachment includes a first sensor that is configured to provide a vibration signal associated with a vibration of the motor during a drilling process, a second sensor that is configured to provide a displacement signal associated with a displacement of a drill bit during the drilling process, and a controller. The controller is configured to receive the vibration signal and the displacement signal. The controller is also configured to determine a characteristic of the motor based on the vibration signal using an algorithm and determine a breakthrough event based on the motor characteristic and the displacement signal.

Provided herein are methods and compositions for treating bone osteonecrosis comprising: at least one of a Gelatin tyramine (GT), a gelatin-heparin tyramine (GHT), a gelatin methacryloyl (GelMa), a gelatin acryloyl (GelAC), collagen, or a hydrogel-forming peptide that can be formed ex vivo or in situ for the treatment of bone osteonecrosis; at least one bone growth promoting agent or a macrophage depletion reagent; and optionally one or more pharmaceutically acceptable carriers.

A cutting accessory for use with a powered surgical handpiece includes an elongated shaft, a tissue working member, and a proximal section. The elongated shaft has proximal and distal ends, and a longitudinal axis. The working member is attached to the distal end of the shaft. The proximal section extends proximally from the distal end and includes a plurality of faces extending inwardly from an outer surface of the shaft. Each face has at least one shallow portion and is shaped to receive a clamping member. At least two of the faces are arranged linearly, extending along the shaft proximal section. A flat extends distally forward of the distalmost face, and is located a distance from the shaft longitudinal axis greater than the distance the shallow portions are located from the longitudinal axis and less than the distance the outer surface of the shaft is from the longitudinal axis.

An arthroscopic cutting probe includes a shaft assembly having a distal end, a proximal end, and a longitudinal axis. A distal cutting member is rotatably attached at the distal end of the shaft assembly, and at least a portion of an exterior surface of the distal cutting member is electrically insulated. One or more burr elements extend radially outwardly from the electrically insulated portion of the exterior surface of the distal cutting member, wherein the burr element is electrically conductive to form an active electrode.

An oscillating drive mechanism for a surgical tool includes a motor having a rotor, a crank assembly hub, a link secured to the crank assembly hub, a pivot shaft, a shuttle including an arcuate rack gear secured to the link so that rotation of the crank assembly hub provides reciprocating rotary motion to the arcuate rack gear about the pivot shaft. A gear is meshed with the arcuate rack gear and is secured to an output shaft, whereby rotational motion of the motor induces rotary oscillating motion to the output shaft.