A closure mechanism is configured to lock the polyaxial motion of the rods with respect to the seat and to lock the polyaxial motion of the bone screw with respect to the seat simultaneously or independently.

The translation member may have first and second portions which move relative to each other with translation movement, and a third locking member to lock the translation movement.

The level arm rotates a lock arm with cam teeth into abutment with a strap to lock the strap against movement.

An actuator (6) assembly which may be coupled to the oscillatory mechanism enables the subject to control the oscillatory mechanism, as well as to brake and lock the motion of the mechanism.

In another aspect, the present invention provides a handle for a surgical instrument comprising one part with a pivoting or articulated end portion, and a means for locking the movement of the end portion.

Therefore, to eliminate the vulnerability, a locking function for locking relative movement to the cross-shaped connection piece is provided so that the entire structure has a strong body.

A locking mechanism is provided between the bracket plate and the main body base for locking the movement of the bracket plate relative to the main body base in the direction of the central axis.

Rotational movement is also used for locking the piston (24) to the drive nut (116) against relative axial movement.

A closure mechanism is configured to lock the polyaxial motion of the rods with respect to the seat and to lock the polyaxial motion of the bone screw with respect to the seat simultaneously or independently.

In the locked position, the device may lock to the element and motion is prevented.

Said locking means (5) constitutes both lock and limitation for the opening movement of the door.

The plunger can interlock with the piston to allow withdrawal movement useful in intravenous injection.

A closure direction (90) of the rotating motion of the housing for locking of the housing-lid connection (24) is in the opposite direction to a closure direction of the rotating motion of the element for locking of the element-lid connection (84).

The rotary encoder is detented, so it clicks for each movement.

Apparatus is disclosed to guide movement of the structure to change gauge and to lock the structure in place to prevent relative movement while the machinery is operated.