Bone clamp
The present disclosure is related to surgical devices, more particular it refers to a surgical clamp that attaches to a patient's bone to assist in surgical procedures. The surgical clamp is configured in such a manner that the clamping elements show a movement in a plane different from the plane of the actuator intended for opening and closing said clamping elements. As a result, the surgical clamp provides a broader working space to the surgeon when carrying out surgical work on the spine.
1. Bone clamp comprising:
a main body comprising at one end a first jaw, the main body and the first jaw forming a single rigid body;
a second jaw rotationally connected to the main body and being opposite of the first jaw, the second jaw comprising an open jaw position and closed jaw position so that both first and second jaws define a grip portion; and
an actuator configured for opening and closing the second jaw, the actuator being rotationally connected to the main body and comprising an open actuator position and a closed actuator position,
wherein the actuator and the second jaw are linked by a kinematic chain so that a passage of the actuator from one actuator position to another actuator position causes the second jaw to pass from one jaw position to another jaw position respectively,
wherein a rotational movement of the actuator is contained in a first plane and a rotational movement of the second jaw is contained in a second plane wherein an orientation of the first plane and an orientation of the second plane are different,
wherein the actuator is rotationally connected to the main body at a first joint and the second jaw is rotationally connected to the main body at a second joint separated along the main body from the first joint, and
wherein the actuation of the actuator is linked with the rotational movement of the second jaw relative to the main body so that a gripper of the clamp can be regulated.
2. Bone clamp according to claim 1 , wherein the second plane and the first plane has an angle in a range of 60° to 120°.
3. Bone clamp according to claim 1 , wherein the second plane and the first plane has an angle in a range of 70° to 110°.
4. Bone clamp according to claim 1 , wherein the second plane and the first plane has an angle in a range of 80° to 110°.
5. Bone clamp according to claim 1 , wherein the second plane is perpendicular to the first plane.
6. Bone clamp according to claim 1 , wherein the kinematic chain is partially housed within the main body, the actuator pivots in a first joint of the main body and the second jaw pivots in a second joint of the main body by means of the rotation of the actuator, the second joint being separated from the first joint.
7. Bone clamp according to claim 1 , wherein the kinematic chain comprises:
a slider; and
a first and second rod-cranks,
wherein the kinematic chain is adapted to transform the rotational movement of the actuator to a linear displacement of the slider by means of the first rod-crank rotatably connecting the actuator and the slider, and
subsequently to transform the linear displacement of the slider to the rotational movement of the second jaw by means of the second rod-crank rotatably connecting the slider and the second jaw.
8. Bone clamp according to claim 7 wherein in operative mode, the first rod-crank movement is in the first plane and, in operative mode, the second rod-crank movement is in the second plane.
9. Bone clamp according to claim 7 , wherein the actuator is connected to a first rod-crank by means of an extension arm extending the actuator to an opposite side of a first joint about which the actuator rotates, so that the opening of the actuator causes the second jaw to open.
10. Bone clamp according to claim 7 , wherein the actuator is directly connected to the first rod-crank so that the opening of the actuator causes the second jaw to close.
11. Bone clamp according to claim 1 further comprising an actuator movement regulation mechanism comprising a locked position where the actuator is fixed and a free position where the actuator can rotate.
12. Bone clamp according to claim 11 , wherein the actuator movement regulation mechanism is a ratchet mechanism and comprises:
an arc-shaped rack protruding from the main body and comprising a plurality of teeth; and
a pawl rotationally connected to the actuator and comprising a tooth that matches those teeth of an arc-shaped rack,
wherein in the free position of the mechanism, the pawl is configured to rotate with respect to the actuator and to slide through the arc-shaped rack thus allowing the actuator to rotate with respect to the arc-shaped rack, and
wherein in the locked position, the pawl movement remains blocked so that the actuator remains fixed.
13. Bone clamp according to claim 12 , wherein the ratchet mechanism further comprises a spring element attached to the actuator and arranged to apply a force to the pawl thus ensuring a contact of the tooth of the pawl with the teeth of an arc-shaped rack.
14. Bone clamp according to claim 12 , wherein the ratchet mechanism further comprises a security handle protruding from the actuator and configured to lock the movement of the pawl in the locked position of the mechanism.
15. Bone clamp according to claim 1 further comprising a kinematic coupling connected to the main body in an end opposite to the first jaw, the kinematic coupling being configured to be coupled to tracking means so that the bone clamp provides an anchor reference.
16. Bone clamp according to claim 15 , wherein the kinematic coupling comprises:
a female portion comprising a ferromagnetic element; and
a male portion comprising a magnet,
wherein the ferromagnetic element and the magnet provide a bonding force between both female and male portions.
17. Bone clamp according to claim 1 , wherein the first and second jaws each comprise a plurality of spikes such that in the closed jaw position, the spikes of both first and second jaws are facing each other.
18. Surgical clamp comprising:
a main body comprising at one end a first jaw, the main body and the first jaw forming a single rigid body;
a second jaw being independent from the main body but rotationally connected to the main body and being opposite of the first jaw, the second jaw comprising an open jaw position and closed jaw position so that both first and second jaws define a grip portion;
an actuator configured for opening and closing the second jaw the actuator being rotationally connected to the main body and comprising an open actuator position and a closed actuator position;
a female portion comprising a ferromagnetic element; and
a male portion comprising a magnet,
wherein the ferromagnetic element and the magnet provide a bonding force between both female and male portions, and wherein the actuator and the second jaw are linked by a kinematic chain so that a passage of the actuator from one actuator position to another actuator position causes the second jaw to pass from one jaw position to another jaw position respectively, and
wherein a rotational movement of the actuator is contained in a first plane and the rotational movement of the second jaw is contained in a second plane wherein an orientation of the first plane and an orientation of the second plane are different,
wherein the actuator is rotationally connected to the main body at a first joint and the second jaw is rotationally connected to the main body at a second joint separated along the main body from the first joint, and
wherein the actuation of the actuator is linked with the rotational movement of the second jaw relative to the main body so that a gripper of the clamp can be regulated.
19. Surgical clamp according to claim 18 , wherein the first and second jaws each comprise a plurality of spikes so that in the closed jaw position, the spikes of both first and second jaws are facing each other.
20. Surgical clamp according to claim 18 , wherein the second plane and the first plane has an angle in a range of 60° to 120°.