Spreader apparatus for knee joints
First Claim
1. A spreader apparatus for knee joints comprising first and second parallel support plates which can be inserted between femur condyles and a tibia, an adjustment mechanism including a housing for moving the first and second plates apart, the adjustment mechanism including an elastically resilient transmission member to one of the support plates for simultaneously making the effective spreading movement readable on a first scale at the housing and the magnitude of the spreading force readable on a second scale at the housing, the housing being tubular and having a first fastening head for the first support plate and a tappet guided therein with a second fastening head for the second support plate, the tappet in the displacement axis being provided with a threaded bore and a setting screw rotatable disposed therein which is supported at the housing by the resilient transmission member in the form of a helical spring, an extension projecting out of the housing for rotating the setting screw, the projecting extension of the setting screw forming the second scale for the magnitude of the spreading force.
3 Assignments
0 Petitions
Accused Products
Abstract
Spreader apparatuses for knee joints are shown which have two parallel support plates (2, 3) which can be inserted between the femur condyles (4, 5) and the tibia (6) and which can be moved apart in connected form by an adjustment mechanism (10). The adjustment mechanism (10) has a housing (10) at which a stroke-extending tappet (17) is supported via an elastically resilient transmission member (7) in order to simultaneously make the effective spreading travel readable on a scale (8) at the housing (1) and the amount of the spreading force readable on a scale (9) at the housing (1).
133 Citations
11 Claims
- 1. A spreader apparatus for knee joints comprising first and second parallel support plates which can be inserted between femur condyles and a tibia, an adjustment mechanism including a housing for moving the first and second plates apart, the adjustment mechanism including an elastically resilient transmission member to one of the support plates for simultaneously making the effective spreading movement readable on a first scale at the housing and the magnitude of the spreading force readable on a second scale at the housing, the housing being tubular and having a first fastening head for the first support plate and a tappet guided therein with a second fastening head for the second support plate, the tappet in the displacement axis being provided with a threaded bore and a setting screw rotatable disposed therein which is supported at the housing by the resilient transmission member in the form of a helical spring, an extension projecting out of the housing for rotating the setting screw, the projecting extension of the setting screw forming the second scale for the magnitude of the spreading force.
- 9. A spreader apparatus for knee joints comprising first and second parallel support plates which can be inserted between femur condyles and a tibia, an adjustment mechanism including a housing for moving the first and second plates apart, and an elastically resilient transmission member connected to one of the support plates for simultaneously displaying an effective spreading movement of the plates readable on a first scale of the housing and a magnitude of the spreading force applied to the plates readable on a second scale at the housing, the first and second support plates each having a lateral web extending in an arc to the adjustment mechanism for spreading the support plates apart so that their feed axis lies in a sagittal central plane of the support plates when the patella and patella ligaments of the knee joint are present.
Specification