Tibial sample implant with gearing mechanism

A tibial trial implant for use in a knee joint replacement operation, comprising:

• a lower part, which is provided for tibial fixation;
• an upper part, which is arranged above the lower part in the height direction and has a glide face that is arranged on the upper side for gliding interaction with a femoral component;
• and
• a height adjustment mechanism, which is actively connected to the upper part and the lower part and by which the upper part is displaceably guidable relative to the lower part in the height direction between:
• a first adjustment position, in which the glide face is positioned at a first height above the lower part, and
• a second adjustment position, in which the glide face is positioned at a second height above the lower part,
• wherein the height adjustment mechanism comprises a cam gear having at least one drive wheel, which is mounted rotatably on the lower part about a first rotation axis oriented parallel to the height direction and comprises a control cam rising in the height direction, and having at least one driven element, which is firmly connected to the upper part and comprises a supporting section glidingly supported on the control cam, so that the upper part is displaceable by rotational movement of the drive wheel between the first adjustment position and the second adjustment position, and
• wherein the upper part and the lower part are releasably plugged together by a plug connection formed between the at least one drive wheel and the at least one driven element while being glidingly mobile relative to one another along a plug axis, the plug axis being oriented coaxially with the first rotation axis.

A tibial trial implant for use in a knee joint replacement operation, comprising:

• a lower part, which is provided for tibial fixation;
• an upper part, which is arranged above the lower part in a height direction and has a glide face that is arranged on the upper side and is provided for gliding interaction with a femoral component;
• and
• a height adjustment mechanism, which is actively connected to the upper part and the lower part and by which the upper part is displaceably guidable relative to the lower part in the height direction between:
• a first adjustment position, in which the glide face is positioned at a first height above the lower part, and
• a second adjustment position, in which the glide face is positioned at a second height above the lower part,
• wherein the height adjustment mechanism comprises a cam gear having at least one drive wheel that is mounted rotatably on the lower part about a first rotation axis oriented parallel to the height direction and comprises a control cam rising in the height direction, and having at least one driven element, which is firmly connected to the upper part and comprises a supporting section glidingly supported on the control cam, so that the upper part is displaceable by a rotational movement of the drive wheel between the first adjustment position and the second adjustment position,
• wherein a scale display is formed between the lower part and the at least one drive wheel, which comprises a reading element and a scale and allows reading of the adjustment position of the upper part and/or of the height of the glide face.

A tibial trial implant for use in a knee joint replacement operation, comprising:

• a lower part, which is provided for tibial fixation;
• an upper part, which is arranged above the lower part in the height direction and has a glide face that is arranged on the upper side and is provided for gliding interaction with a femoral component;
• and
• a height adjustment mechanism, which is actively connected to the upper part and the lower part and by which the upper part can be guided displaceably relative to the lower part in the height direction between:
• a first adjustment position, in which the glide face is positioned at a first height above the lower part, and
• a second adjustment position, in which the glide face is positioned at a second height above the lower part,
• wherein the height adjustment mechanism comprises a cam gear having at least one drive wheel that is mounted rotatably on the lower part about a first rotation axis oriented parallel to the height direction and comprises a control cam rising in the height direction, and having at least one driven element, which is firmly connected to the upper part and comprises a supporting section glidingly supported on the control cam, so that the upper part is displaceable by a rotational movement of the drive wheel between the first adjustment position and the second adjustment position,
• wherein the at least one drive wheel is coupled so as to transmit movement to at least one display wheel that is rotationally mounted on the lower part, the display wheel comprising a scale that allows reading of the adjustment position of the upper part and/or of the height of the glide face.