Knockout tool for joint prostheses

Claim 2

A knockout tool for joint prostheses, the knockout tool adapted for gripping a prosthesis shaft (4), the knockout tool comprising: a curved tool head (2), the tool head having a passage (6) therethrough for receiving the prosthesis shaft; and a locking device (8, 10, 12) to releasably block the prosthesis shaft within the passage, the locking device further comprising a blocking member (8) engaging the passage, the blocking member having a position adjustable in an axial direction transverse to a length of the prosthesis shaft by actuator means disposed within the tool head for adjusting a position of the blocking member, the actuator means including actuators axially displaceable within the tool head; whereby a force transmitted axially along said actuators adjusts the position of the blocking member.

Claim 3

A knockout tool for joint prostheses, the knockout tool adapted for gripping a prosthesis shaft (4), the knockout tool comprising: a curved tool head (2), the tool head having a passage (6) therethrough for receiving the prosthesis shaft; and a locking device (8, 10, 12) to releasably block the prosthesis shaft within the passage, the locking device further comprising a blocking member (8) engaging the passage, the blocking member having a position adjustable by actuator means disposed within the tool head for adjusting a position of the blocking member, the actuator means including actuators axially displaceable within the tool head, whereby a force transmitted axially along said actuators adjusts the position of the blocking member; and wherein the tool head is smoothly curved and the actuator means includes an axial longitudinal recess (14) opening into the passage; the actuators and the blocking member being disposed within the recess.

Claim 4

A knockout tool for joint prostheses, the knockout tool adapted for gripping a prosthesis shaft (4), the knockout tool comprising: a curved tool head (2), the tool head having a passage (6) therethrough for receiving the prosthesis shaft; and a locking device (8, 10, 12) to releasably block the prosthesis shaft within the passage, the locking device further comprising a blocking member (8) engaging the passage, the blocking member having a position adjustable by actuator means disposed within the tool head for adjusting a position of the blocking member, the actuator means including actuators axially displaceable within the tool head, whereby a force transmitted axially along said actuators adjusts the position of the blocking member; and wherein the tool head is smoothly curved and the actuator means includes an axial longitudinal recess (14) opening into the passage; the actuators and the blocking member being disposed within the recess.

Claim 5

The knockout tool of claim 2, wherein the actuators and the blocking member are guided in opposed grooves (16) formed in the tool head.

Claim 6

A knockout tool for joint prostheses, the knockout tool adapted for gripping a prosthesis shaft (4), the knockout tool comprising: a curved tool head (2), the tool head having a passage (6) therethrough for receiving the prosthesis shaft; and a locking device (8, 10, 12) to releasably block the prosthesis shaft within the passage, the locking device further comprising a blocking member (8) engaging the passage, the blocking member having a position adjustable by actuator means disposed within the tool head for adjusting a position of the blocking member, the actuator means including actuators axially displaceable within the tool head, whereby a force transmitted axially along said actuators adjusts the position of the blocking member; and wherein the actuators further comprise an inner actuator (10) and an outer actuator (12), the inner actuator including a pivot shaft (20), the inner actuator being connected to a lever (18) that acts to feed the blocking element into a locking position and to releasably block the blocking element in the locking position.

Claim 7

A knockout tool for joint prostheses, the knockout tool adapted for gripping a prosthesis shaft (4), the knockout tool comprising: a curved tool head (2), the tool head having a passage (6) therethrough for receiving the prosthesis shaft; and a locking device (8, 10, 12) to releasably block the prosthesis shaft within the passage, the locking device further comprising a blocking member (8) engaging the passage, the blocking member having a position adjustable by actuator means disposed within the tool head for adjusting a position of the blocking member, the actuator means including actuators axially displaceable within the tool head, whereby a force transmitted axially along said actuators adjusts the position of the blocking member; and wherein the actuators further comprise an inner actuator (10) and an outer actuator (12), the inner actuator including a pivot shaft (20), the inner actuator being connected to a lever (18) that acts to feed the blocking element into a locking position and to releasably block the blocking element in the locking position.

Claim 8

A knockout tool for joint prostheses, the knockout tool adapted for gripping a prosthesis shaft (4), the knockout tool comprising: a curved tool head (2), the tool head having a passage (6) therethrough for receiving the prosthesis shaft; and a locking device (8, 10, 12) to releasably block the prosthesis shaft within the passage, the locking device further comprising a blocking member (8) engaging the passage, the blocking member having a position adjustable by actuator means disposed within the tool head for adjusting a position of the blocking member, the actuator means including actuators axially displaceable within the tool head, whereby a force transmitted axially along said actuators adjusts the position of the blocking member; and wherein the actuators include selectively balls and rollers (40).

Claim 9

A knockout tool for joint prostheses, the knockout tool adapted for gripping a prosthesis shaft (4), the knockout tool comprising: a curved tool head (2), the tool head having a passage (6) therethrough for receiving the prosthesis shaft; and a locking device (8, 10, 12) to releasably block the prosthesis shaft within the passage, the locking device further comprising a blocking member (8) engaging the passage, the blocking member having a position adjustable by actuator means disposed within the tool head for adjusting a position of the blocking member, the actuator means including actuators axially displaceable within the tool head, whereby a force transmitted axially along said actuators adjusts the position of the blocking member; and wherein the actuators include selectively balls and rollers (40).

Claim 10

A knockout tool for joint prostheses, the knockout tool adapted for gripping a prosthesis shaft (4), the knockout tool comprising: a curved tool head (2), the tool head having a passage (6) therethrough for receiving the prosthesis shaft; and a locking device (8, 10, 12) to releasably block the prosthesis shaft within the passage, the locking device further comprising a blocking member (8) engaging the passage, the blocking member having a position adjustable by actuator means disposed within the tool head for adjusting a position of the blocking member, the actuator means including actuators axially displaceable within the tool head, whereby a force transmitted axially along said actuators adjusts the position of the blocking member; further comprising an actuation rod (24, 62) connected to the tool head and a hammer element (26, 58) slidably mounted on the actuation rod; and wherein an adjusting rod (28, 54) is slidably mounted in the actuation rod and is connected to the tool head (2) such that the adjusting force is brought to bear upon an outer actuator (12) of the tool head.

Claim 11

A knockout tool for joint prostheses, the knockout tool adapted for gripping a prosthesis shaft (4), the knockout tool comprising: a curved tool head (2), the tool head having a passage (6) therethrough for receiving the prosthesis shaft; and a locking device (8, 10, 12) to releasably block the prosthesis shaft within the passage, the locking device further comprising a blocking member (8) engaging the passage, the blocking member having a position adjustable by actuator means disposed within the tool head for adjusting a position of the blocking member, the actuator means including actuators axially displaceable within the tool head, whereby a force transmitted axially along said actuators adjusts the position of the blocking member; further comprising an actuation rod (24, 62) connected to the tool head and a hammer element (26, 58) slidably mounted on the actuation rod; and wherein an adjusting rod (28, 54) is slidably mounted in the actuation rod and is connected to the tool head (2) such that the adjusting force is brought to bear upon an outer actuator (12) of the tool head.

Claim 12

The knockout tool of claim 6, wherein the adjusting rod simultaneously acts to adjust an engagement position of the blocking element for adaptation to different shaft diameters of the prosthesis shaft and to lock the blocking element.

Claim 13

The knockout tool of claim 6, wherein a lever member (56) is disposed on an end of the adjusting rod and is operatively connected to the adjusting rod such that swiveling of the lever member displaces the adjusting rod toward the tool head.

Claim 14

The knockout tool of claim 8, wherein the lever member is removable.

Claim 15

A knockout tool for gripping a joint prosthesis shaft extending from a bone and for removing a prosthesis of the joint prosthesis shaft from the bone, the knockout tool comprising: a tool head further including an actuating end and a gripping end, an exterior surface having a smooth curve, a passage proximal the gripping end and extending from the exterior surface to a distal side of the tool head, and an interior channel communicating with the passage; a blocking member slidably disposed within the channel proximal the passage, the blocking member adapted together with the passage for gripping the prosthesis shaft therebetween; actuator elements slidably disposed within the channel, the actuator elements including an inner actuator element proximal the blocking member and an outer actuator element distal the blocking member; blocking force means for releasably locking the blocking member against the prosthesis shaft; and dislodging means for applying knockout force to the prosthesis shaft for removing the prosthesis.

Claim 16

A knockout tool for gripping a joint prosthesis shaft extending from a bone and for removing a prosthesis of the joint prosthesis shaft from the bone, the knockout tool comprising: a tool head further including an actuating end and a gripping end, an exterior surface having a smooth curve, a passage proximal the gripping end and extending from the exterior surface to a distal side of the tool head, and an interior channel communicating with the passage; a blocking member slidably disposed within the channel proximal the passage, the blocking member adapted together with the passage for gripping the prosthesis shaft therebetween; actuator elements slidably disposed within the channel, the actuator elements including an inner actuator element proximal the blocking member and an outer actuator element distal the blocking member; blocking force means for releasably locking the blocking member against the prosthesis shaft; and dislodging means for applying knockout force to the prosthesis shaft for removing the prosthesis.

Claim 17

The knockout tool according to claim 10, wherein the dislodging means includes a hammer slidably mounted on a rod, the rod connected to the actuating end of the tool head.

Claim 18

The knockout tool according to claim 11, wherein the passage and the blocking member are jointly formed such that the prosthesis shaft is perpendicular to the exterior surface when the blocking member is locked against the prosthesis shaft.

Claim 19

The knockout tool according to claim 11, wherein the rod is parallel to a tangent to the exterior surface at the actuating end.