Fastening unit for fastening a device for supporting a patient to be x-rayed to an operating table

A fastening device for an operating table, comprising:

• a housing having a receptacle that receives a coupler of an operating table device;
• a locking bar connected to the housing and movable relative to the housing between a locked position and an unlocked position, the locking bar retaining the coupler in the receptacle in the locked position, and the locking bar releasing the coupler from the receptacle in the unlocked position;
• a torsion spring that urges the locking bar toward the locked position;
• a lever that moves the locking bar from the locked position to the unlocked position;
• and
• a ratchet assembly that maintains the locking bar in the unlocked position;
• wherein the ratchet assembly maintains the locking bar in the unlocked position, when the coupler is disposed in the receptacle and the locking bar has been moved by the lever into the unlocked position, at least until the coupler is removed from the receptacle or the lever is actuated again.

An assembly, comprising:

• an operating table;
• a patient-support device including two rails;
• a device-side fastening assembly disposed on each rail;
• and
• a plurality of operating-table-side fastening devices disposed on the operating table, each of the plurality of operating-table-side fastening devices including
• a housing having a receptacle that receives a coupler of the device-side fastening assembly;
• a locking member connected to the housing and movable relative to the housing between a locked position and an unlocked position, the locking member retaining the coupler in the receptacle in the locked position, and the locking member releasing the coupler from the receptacle in the unlocked position;
• a resilient member that urges the locking member toward the locked position;
• an actuation member that moves the locking member from the locked position to the unlocked position;
• and
• a ratchet assembly that maintains the locking member in the unlocked position;
• wherein the ratchet assembly maintains the locking member in the unlocked position when the coupler is disposed in the receptacle and the locking member has been moved into the unlocked position by a first actuation of the actuation member;
• and
• wherein the ratchet assembly releases the locking member from the unlocked position when either the coupler has been removed from the receptacle or the actuation member is actuated a second time;
• wherein each rail is fastened to the operating table via each of the device-side fastening assemblies being attached to a respective one of the plurality of operating-table-side fastening devices.