Abstract: Medical-technical instrumentation and a medical-technical method that utilize a planning data set created for a surgeon on the basis of an actual state data set of a bone that is considered to be defective. The planning data set can be used intraoperatively for improving the surgery outcome.

Abstract: An apparatus is proposed for connection of workpieces using the friction stir welding method, with a shaft (33, 33?) which can be driven such that it rotates and at whose end remote from the drive end of the shaft a pin-like projection (8) is arranged, at whose end a first stop, which is formed by a first shoulder (6), is arranged, with the first shoulder having a diameter which is larger than the diameter of the pin-like projection (8), and with a second stop (7, 7?), which is formed from a second shoulder and is arranged such that the workpieces (19) to be connected can be enclosed between the stops (6, 7, 7?), in that at least one of the stops can be moved translationally in order to enclose the workpieces (19) with a predetermined force in the direction of the other stop.

Abstract: An apparatus is proposed for connection of workpieces using the friction stir welding method, with a shaft (33, 33?) which can be driven such that it rotates and at whose end remote from the drive end of the shaft a pin-like projection (8) is arranged, at whose end a first stop, which is formed by a first shoulder (6), is arranged, with the first shoulder having a diameter which is larger than the diameter of the pin-like projection (8), and with a second stop (7, 7?), which is formed from a second shoulder and is arranged such that the workpieces (19) to be connected can be enclosed between the stops (6, 7, 7?), in that at least one of the stops can be moved translationally in order to enclose the workpieces (19) with a predetermined force in the direction of the other stop.

Abstract: An apparatus is proposed for connection of workpieces using the friction stir welding method, with a shaft (33, 33?) which can be driven such that it rotates and at whose end remote from the drive end of the shaft a pin-like projection (8) is arranged, at whose end a first stop, which is formed by a first shoulder (6), is arranged, with the first shoulder having a diameter which is larger than the diameter of the pin-like projection (8), and with a second stop (7, 7?), which is formed from a second shoulder and is arranged such that the workpieces (19) to be connected can be enclosed between the stops (6, 7, 7?), in that at least one of the stops can be moved translationally in order to enclose the workpieces (19) with a predetermined force in the direction of the other stop.

Abstract: In a method and apparatus for joining at least two work pieces by friction stir welding wherein the work pieces are at least partially plasticized in the area where they are to be joined by a rotating friction tool provided with a projection which can be moved into the area of the joint to be formed, the projection on the rotating tool has a length corresponding about to the thickness of the work piece and a shoulder around the pin-like projection so that, upon movement of the tool toward the work pieces, the work piece material is plasticized by the rotating pin-like projection which moves into the work piece material until it reaches the surfaces of the lowermost

Abstract: In a method and apparatus for joining at least two adjoining workpieces by friction welding, a rotatable shaft is provided at its front end with a friction welding tool which is biased toward the workpieces to plasticize an area of the workpiece into which the tool enters while the plasticized material is displaced and stored in, or around, the tool. Upon passing through the top workpiece and entering the lowermost work piece, the tool is removed and the stored plasticized material is returned to the void provided by the tool upon removal thereof from the workpieces for joining the workpieces.

Abstract: In a device for joining, by friction stir welding, at least two workpieces, a support structure is provided with a head portion which includes drive means and a shaft which is rotatable by the drive means and has a pin-like projection projecting toward a support member of the support structure for supporting workpieces to be joined by friction stir welding and wherein guide means are provided for moving the rotating pin-like projection into contact with, and into, the workpieces while plasticizing the workpieces in the contact area to form thereby a spot weld by friction stir welding.

Abstract: In a method and apparatus for joining at least two adjoining workpieces by friction welding, a rotatable shaft is provided at its front end with a friction welding tool which is biased toward the workpieces to plasticize an area of the workpiece into which the tool enters while the plasticized material is displaced and stored in, or around, the tool. Upon passing through the top workpiece and entering the lowermost work piece, the tool is removed and the stored plasticized material is returned to the void provided by the tool upon removal thereof from the workpieces for joining the workpieces.

Abstract: In a device for joining, by friction stir welding, at least two workpieces, a support structure is provided with a head portion which includes drive means and a shaft which is rotatable by the drive means and has a pin-like projection projecting toward a support member of the support structure for supporting workpieces to be joined by friction stir welding and wherein guide means are provided for moving the rotating pin-like projection into contact with, and into, the workpieces while plasticizing the workpieces in the contact area to form thereby a spot weld by friction stir welding.