Medical instrument
A medical instrument according to the invention has an elongate shank, and a tool which is arranged on a distal end portion of the shank and which comprises two tool elements interacting with each other, of which at least one tool element is movable by a longitudinally displaceable first transmission element. A distal end portion of the first transmission element has a surface inclined with respect to a direction of displacement, and the distal end portion of the shank, or an element connected non-displaceably thereto, has a mating surface which is inclined with respect to the direction of displacement and which, with the inclined surface, forms an interspace dependent on a displacement of the distal end portion of the first transmission element.
1. A medical instrument with an elongate shank, and a tool which is arranged on a distal end portion of the shank and which comprises two tool elements interacting with each other, for the purpose of holding an object, of which at least one tool element is movable by a longitudinally displaceable first transmission element, wherein a distal end portion of the first transmission element has a surface inclined with respect to a direction of displacement, and the distal end portion of the shank, or an element connected non-displaceably thereto, has a mating surface which is inclined with respect to the direction of displacement and which, with the inclined surface, forms an interspace dependent on a displacement of the distal end portion of the first transmission element, and in that at least one locking element is present, which is movable into the interspace in order to block the displacement of the first transmission element and is movable out of said interspace in order to release the blocking.
2. The medical instrument according to claim 1 , wherein the inclined surface is arranged on an outer side of the distal end portion of the first transmission element, and the mating surface is arranged on an inner side of a tubular element.
3. The medical instrument according to claim 1 , wherein the tool elements interacting with each other can be closed by a displacement of the first transmission element in a proximal direction, and in that the inclined surface and the mating surface rise radially in the proximal direction.
4. The medical instrument according to claim 1 , wherein the interspace is wedge-shaped.
5. The medical instrument according to claim 1 , wherein the inclined surface and the mating surface are inclined at such an angle with respect to the direction of displacement that the displacement of the first transmission element can be blocked in a self-retaining manner.
6. The medical instrument according to claim 1 , wherein the at least one locking element is wedge-shaped.
7. The medical instrument according to claim 1 , wherein the at least one locking element is connected radially movably to a distal end portion of a second transmission element.
8. The medical instrument according to claim 7 , wherein the at least one locking element is articulated with two lugs on the distal end portion of the second transmission element.
9. The medical instrument according to claim 1 , wherein the at least one locking element is guided displaceably in a groove of the distal end portion of the shank, and a bottom of the groove forms the mating surface.
10. The medical instrument according to claim 1 , wherein two locking elements are present, which are movable jointly.
11. The medical instrument according to claim 1 , wherein the tool is rotatable about a rotation axis parallel to a longitudinal axis of the distal end portion of the shank, and the distal end portion of the first transmission element is mounted rotatably about the rotation axis relative to a proximal portion.
12. The medical instrument according to claim 1 , wherein the distal end portion of the shank is pivotable about a transverse axis relative to a proximal portion of the shank.
13. The medical instrument according to claim 1 , wherein the at least one locking element is spring-loaded into a locking position.
14. The medical instrument according to claim 13 , wherein a control spring for spring-loading the at least one locking element is arranged in a handle of the medical instrument.