Medical instrument
View Patent ↗A medical instrument with a proximal instrument part and a distal instrument part that are connected with one another by an elongated shaft. The distal instrument part includes a pivot element that is mounted to pivot with respect to the shaft and that can pivot by a translationally moveable actuation element. The pivot element is coupled with the actuating element by a coupling element, so that the coupling element is in a hinged connection with the pivot element by a first hinged connection and with the actuation element by a second hinged connection. The second hinged connection is controlled by at least one nonlinear guide formed by the distal instrument part in such a way that the pivot element can pivot both in the one pivot direction and in the other pivot direction. The actuating element is configured to be suitable for control by the nonlinear guide.
1. A medical instrument with a proximal instrument part and a distal instrument part that are connected with one another by an elongated shaft, such that the distal instrument part includes a pivot element that is mounted to pivot with respect to the shaft and that is pivotable by means of a translationally movable actuation element, wherein
the pivot element is coupled with the actuation element by means of at least one coupling element, so that the coupling element is in a hinged connection with the pivot element by a first hinged connection and with the actuation element by a second hinged connection,
the second hinged connection of the coupling element is controlled by at least one nonlinear channel or nonlinear groove formed by the distal instrument part in such a way that the pivot element is pivotable both in one pivot direction as well as in the other pivot direction, and
the nonlinear channel or nonlinear groove is configured to guide the actuation element in nonlinear movement.
2. The medical instrument according to claim 1 , wherein the nonlinear channel or nonlinear groove is of angular configuration, with a longitudinal portion extending in the longitudinal axis of the shaft and a diagonal portion extending diagonally to the longitudinal axis.
3. The medical instrument according to claim 1 , wherein the second hinged connection of the coupling element is directly controlled by the nonlinear channel or nonlinear groove.
4. The medical instrument according to claim 3 , wherein the nonlinear channel or nonlinear groove is configured as a connecting link guide.
5. The medical instrument according to claim 4 , wherein the second hinged connection of the coupling element includes at least one hinged member that grips in the connecting link guide.
6. The medical instrument according to claim 2 , wherein the second hinged connection of the coupling element is controlled directly by the nonlinear channel or nonlinear groove.
7. The medical instrument according to claim 1 , wherein the actuation element comprises a distal end portion that is pivotably hinged onto a different portion of the actuation element.
8. The medical instrument according to claim 1 , wherein the actuation element is flexible.
9. The medical instrument according to claim 1 , characterized by at least one arch-shaped coupling element.
10. The medical instrument according to claim 1 , wherein the distal instrument part includes a forked portion to hinge the pivot element.
11. The medical instrument according to claim 1 , wherein the pivot element, starting from a middle position, is pivotable by at least 90 degrees in the one pivot direction and at least 90 degrees in the other pivot direction.