CN218045258U - Osteotomy tool - Google Patents

Abstract

The utility model relates to a bone cutting tool, including space navigation (1) and cut bone subassembly (3), space navigation (1) includes arm (11), cut bone subassembly (3) and connect on arm (11). The utility model discloses can pinpoint the high-order osteotomy of shin bone.

Description

Osteotomy tool

Technical Field

The utility model relates to a bone cutting tool.

Background

High Tibial Osteotomy (HTO) is a medical means for treating knee varus, which is often followed by thousands , poliomyelitis, trauma, infection and other destructive diseases, thereby causing malformation of femur or tibia, changing force lines of lower limbs and contact pressure of knee joints, further causing imbalance in length of both lower limbs, inducing osteoarthritis of joints, causing pain of affected limbs, gait, appearance abnormality and the like. The tibia high-position osteotomy has a good effect on the aspect of treating knee joint varus and valgus deformity, and is widely applied clinically.

The existing high-position tibial osteotomy mainly determines an osteotomy plane and an osteotomy angle through an X-ray before an operation, but is influenced by factors such as a shooting distance, a ray central line angle, a projection position and the like, the measured values are usually not accurate enough, and the poor healing and the rotational deformity of a complex three-dimensional bone are difficult to accurately evaluate through X-ray radiography or cross section imaging. In addition, in the two-dimensional image, the deformed angle of a plane other than the frontal plane cannot be measured, and thus the deformed measurement cannot be estimated from the three-dimensional plane, resulting in a large deviation of the preoperative evaluation. In addition, in the existing osteotomy orthopedic surgery, a doctor usually needs to perform multiple osteotomies and continuously adjust the position under the C-shaped arm to obtain the desired orthopedic surgery through personal experience, which results in more bone loss, longer surgery time, large bleeding amount during surgery and increased postoperative complications, thereby seriously affecting the surgery effect.

Therefore, the difference between the two-dimensional layer obtained by the preoperative X-ray and the actual three-dimensional layer causes the difference between the preoperative prescription and the intraoperative operation. Meanwhile, the operation time and precision in the operation are both controlled manually, so that the method has strong subjectivity, the time and precision control are different, certain influence is caused on the safety in the operation, and the recovery effect after the operation is also adversely affected.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cut bone instrument.

In order to realize the purpose of the utility model, the utility model provides an osteotomy tool, include space navigation and cut the bone subassembly, space navigation includes the arm, it connects to cut the bone subassembly on the arm.

According to one aspect of the present invention, the osteotomy assembly includes a coupling flange and a mounting seat;

one end of the mounting seat is connected with one end of the connecting flange, and the other end of the connecting flange is connected with the mechanical arm;

the other end of the mounting seat is provided with a chuck which can be clamped by a tightening screw.

According to one aspect of the present invention, the osteotomy assembly further comprises a locking structure, an osteotomy ruler, and a motor;

the locking structure can be connected with the mounting seat, and the osteotomy ruler is connected with the locking structure;

the output end of the motor is connected with the osteotomy ruler.

According to one aspect of the present invention, the locking structure comprises a receiving cylinder, a torsion spring and a locking sleeve;

one end of the accommodating barrel is open, and the motor is arranged in the accommodating barrel;

the torsion spring is sleeved outside the open end of the containing cylinder, and the locking sleeve is sleeved outside the torsion spring;

the output shaft of motor is overlapped and is equipped with first bearing and adjustable ring, the adjustable ring is located first bearing with between the motor.

According to one aspect of the utility model, the outer side wall of the open end of the containing cylinder is provided with a first blocking bulge and a second blocking bulge which extend outwards;

the first blocking bulges and the second blocking bulges are sequentially arranged towards the open end of the accommodating cylinder, and the outer diameter of the second blocking bulges is larger than that of the first blocking bulges;

the outer side wall of the first blocking bulge is provided with limiting through holes which are oppositely arranged, and the second blocking bulge is provided with a first connecting groove;

the limiting through hole extends along the circumferential direction of the accommodating cylinder;

a blocking ring corresponding to the first blocking bulge is arranged on the inner wall of one end of the locking sleeve, and a second connecting groove is formed in the blocking ring;

two ends of the torsion spring are respectively connected to the first connecting groove and the second connecting groove;

and a limiting pin is inserted into the locking sleeve, is oppositely arranged and extends into the limiting through hole, and can move in the limiting through hole along the circumferential direction of the containing cylinder.

According to one aspect of the present invention, the osteotomy ruler comprises a connecting cylinder, a worm, a fixed ruler, a movable ruler and an angle ruler;

one end of the fixed ruler is fixedly connected with one end of the connecting cylinder, and one end of the movable ruler is hinged to the other end of the fixed ruler;

the worm is rotatably arranged in the connecting cylinder, the end part of the worm is exposed, and the worm is provided with spiral teeth;

the other end of the movable ruler is provided with worm gear teeth which are meshed with the spiral teeth on the worm;

the angle ruler is arc-shaped, and the movable ruler is provided with an arc-shaped through hole;

one end of the angle ruler is fixed on the fixed ruler, and the movable ruler is movably sleeved on the angle ruler through the arc-shaped through hole;

the worm is connected with the fixed ruler through a second bearing, and a gap is formed between the second bearing and the connecting cylinder;

the side of the angle ruler is provided with angle lines, and one side of the fixed ruler, which is far away from the movable ruler, is provided with scale marks.

According to one aspect of the present invention, an unlocking groove, a guiding groove and a locking groove are formed at an end of the connecting cylinder away from the fixing ruler;

the unlocking groove, the guide groove and the locking groove are sequentially arranged from the end part of the connecting cylinder to the direction of the fixed ruler;

the unlocking groove, the guide groove and the locking groove are oppositely arranged in two groups;

the groove wall on one side of the unlocking groove is an inclined surface, and the groove width is gradually reduced towards the direction of the fixed ruler;

the guide groove extends along the axial direction of the connecting cylinder, and the locking groove extends along the circumferential direction of the connecting cylinder.

According to one aspect of the utility model, the end of the fixed ruler is provided with a cylindrical groove, and the end of the movable ruler is provided with a cylindrical protrusion;

the columnar bulge is buckled in the columnar groove and can rotate around the axis of the columnar surface in the columnar groove.

According to an aspect of the utility model, the osteotomy subassembly still includes the osteotomy sword, the osteotomy sword can with the mount pad is connected.

According to one aspect of the present invention, the space navigation system further comprises a trolley and a display;

the mechanical arm and the display are both arranged on the trolley.

According to the utility model discloses a think about, provide the osteotomy instrument that can pinpoint the high-order osteotomy of shin bone to the robot is the medium, forms one set of surgical robot that possesses automatic operation function, can combine C type arm machine X ray machine and space navigation, realizes accurate positioning, earlier stage planning, the intraoperative execution of the high-order osteotomy of shin bone, in order to reduce the difference nature of planning before the art and intraoperative execution.

According to the utility model discloses a scheme utilizes worm gear mechanism and motor cooperation, can realize osteotomy chi and strut accuracy, the automated control of angle. And the mounting seat adopts the chuck as a connecting structure, and can form a quick-release design, so that the osteotomy component at the front end of the mechanical arm can be independently detached and sterilized, and the active part and the passive part of the tool are separated, thereby improving the sterilization effect. And, the mount pad of so design still can accurately respectively, install osteotomy sword and osteotomy chi that match with space navigation fast to realize the quick replacement of instrument, also make the instrument possess multiple functions.

According to the utility model discloses a scheme is equipped with scale mark and angle line on fixed ruler and the bevel protractor respectively for this instrument possesses the measurement of the degree of depth and angle simultaneously, thereby can quantify operation process, with the operation that realizes accurate, become more meticulous, and then improve the degree of accuracy of operation.

Drawings

FIG. 1 is a schematic diagram of an osteotomy tool with an osteotomy ruler according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a front end view of a robotic arm with an osteotomy ruler according to one embodiment of the present invention;

FIG. 3 is a cross-sectional view of the front end of a robot arm with an osteotomy ruler according to one embodiment of the present invention;

FIG. 4 schematically illustrates a cross-sectional view of a locking structure in accordance with an embodiment of the present invention;

FIG. 5 is a schematic diagram of a containment vessel according to an embodiment of the present invention;

fig. 6 is a schematic view showing a structure of a locking sleeve according to an embodiment of the present invention;

FIG. 7 is a schematic view showing a structure of a torsion spring according to an embodiment of the present invention;

fig. 8 is a view schematically showing an assembled state of a lock structure according to an embodiment of the present invention;

FIG. 9 schematically illustrates a cross-sectional view of an osteotomy ruler of an embodiment of the present invention;

FIG. 10 schematically illustrates an exploded view of an osteotomy ruler of an embodiment of the present invention;

FIG. 11 is a schematic illustration of an exploded view of the front end of a manipulator arm with an osteotomy ruler according to one embodiment of the present invention;

fig. 12 is a schematic view showing a front end structure of a manipulator arm equipped with a osteotome according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.

Referring to fig. 1, the utility model discloses an automatic bone instrument of cutting of robot can pinpoint the high-order osteotomy of shin bone, and it includes space navigation 1 and cuts bone subassembly 3. The space navigation system 1 comprises a mechanical arm 11, a trolley 12 and a display 13, wherein the mechanical arm 11 and the display 13 are arranged on the trolley 12, and the osteotomy component 3 is connected to the mechanical arm 11.

Referring to fig. 2, the osteotomy assembly 3 comprises a connecting flange 31 and a (quick release) mount 32. One end of the mounting seat 32 is connected to one end of the connecting flange 31 through a bolt, and the other end of the connecting flange 31 is fixedly connected to the mechanical arm 11 through a screw and a positioning pin. The other end of the mounting block 32 has a collet 321, and the collet 321 can be tightened by tightening a screw 322 to assist in the fixation of the osteotome and osteotomy ruler.

Referring to figures 3 and 4, the osteotomy assembly 3 includes a locking structure 33, an osteotomy rule 34 and a motor 36. The locking structure 33 includes a receiving cylinder 331, a torsion spring 333, and a locking sleeve 334. One end of the accommodation cylinder 331 is open, and the motor 36 is concentrically disposed in the accommodation cylinder 331. The torsion spring 333 is sleeved outside the open end of the accommodating cylinder 331, the locking sleeve 334 is sleeved outside the torsion spring 333, and the three are concentrically arranged. The output shaft of the motor 36 is sleeved with a first bearing 361 and an adjusting ring 362, and the adjusting ring 362 is located between the first bearing 361 and the motor 36, so that the output shaft of the motor 36 is prevented from being broken due to too deep insertion. The utility model discloses in, the output shaft of motor 36 and the hole transition fit of first bearing 361, first bearing 361 then is clearance fit with the inner wall that holds a section of thick bamboo 331. The receiving cylinder 331 may be clamped in the collet 321 with the osteotomy ruler 34 connected to the locking structure 33 to complete the installation of the osteotomy ruler 34. The output shaft of the motor 36 is connected to the osteotomy ruler 34, and the other end is fixed to the bottom (i.e., closed end) of the accommodating cylinder 331 by a fixing screw B.

Referring to fig. 5 to 8, the outer side wall of the open end of the receiving cylinder 331 is provided with first and second blocking protrusions 3311,3312 extending outward. The first and second blocking protrusions 3311,3312 are sequentially arranged toward the open end of the receiving cylinder 331, and the second blocking protrusion 3312 has an outer diameter greater than that of the first blocking protrusion 3311. Two sides of the outer sidewall of the first blocking protrusion 3311 are provided with two oppositely arranged limiting through holes 3311a, and the second blocking protrusion 3312 is provided with a first connecting groove 3312a. The through hole 3311a extends along the circumference of the accommodating cylinder 331 to form an oblong hole (or a kidney-shaped hole). A blocking ring 3341 corresponding to the first blocking protrusion 3311 is disposed on an inner wall of one end of the locking sleeve 334, and a second connecting groove 3341a is disposed on the blocking ring 3341. Two limit pins 3342 are inserted into both sides of the locking sleeve 334, and the limit pins 3342 are oppositely disposed and extend into the limit through holes 3311a, and can move in the limit through holes 3311a along the circumferential direction of the accommodating cylinder 331. Thus, the locking sleeve 334 can rotate around the accommodating cylinder 331, and the rotation stroke is the dimension of the through hole 3311 a. Both ends of the torsion spring 333 are respectively connected at the first and second connection grooves 3312a and 3341a.

Referring to fig. 9 and 10, osteotomy ruler 34 includes a connecting cylinder 341, a worm 342, a fixed ruler 343, a movable ruler 344 and an angle ruler 345. One end of the fixed ruler 343 is fixedly connected to one end of the connecting cylinder 341 by means of a pin or welding, and one end of the movable ruler 344 is hinged to the other end of the fixed ruler 343. The worm 342 is concentrically and rotatably disposed in the connecting cylinder 341, and has an end portion penetrating the fixed rule 343 and exposed, and the end portion is provided with a spiral tooth 342a. The other end of the movable ruler 344 is provided with worm gear teeth 344a, and is engaged with spiral teeth 342a on the worm 342 to form a worm gear mechanism. The angle rule 345 is arc-shaped, and the movable rule 344 is provided with an arc-shaped through hole 3441. One end of the angle rule 345 is fixed on the fixed rule 343 by a pin a or welding, and the movable rule 344 is movably sleeved on the angle rule 345 by an arc-shaped through hole 3441. The worm 342 is connected to the fixed rule 343 through a second bearing 346, that is, the inside of the second bearing 346 is in interference fit with the worm 342, and the second bearing 346 has a gap with the connecting cylinder 341. Therefore, the worm 342 can keep high concentricity with the connecting cylinder 341 when rotating, and the accuracy of the opening and closing angle of the osteotomy ruler 34 is improved. The other end of the worm 342 is connected to the output shaft of the motor 36 by spline fitting (also clearance fitting). The angle rule 345 is provided with an angle line 345a at a side surface thereof, and a graduation line 343a is provided at a side of the fixed rule 343 far from the movable rule 344, so that the penetration depth and the opening and closing angle of the current osteotomy rule 34 can be read through the graduation line and the angle line. The end of the fixed rule 343 is provided with a cylindrical groove 3431, the end of the movable rule 344 is provided with a cylindrical protrusion 3442, and the cylindrical protrusion 3442 is concentrically fitted in the cylindrical groove 3431 and can rotate therein around the cylindrical axis. Thus, both form a hinge at the tip, which drives the movable rule 344 to rotate about the hinge point as the worm 342 rotates.

Referring to fig. 11, an end of the connecting cylinder 341 remote from the fixing rule 343 is provided with an unlocking groove 3411, a guide groove 3412, and a locking groove 3413. The unlocking groove 3411, the guide groove 3412 and the locking groove 3413 are arranged in this order from the end of the connecting cylinder 341 toward the fixing rule 343. The unlocking groove 3411, the guide groove 3412 and the locking groove 3413 are provided in two sets opposite to each other on both sides of the connecting cylinder 341 and should be symmetrical about the center of the shaft center. The wall of the unlocking groove 3411 on one side is inclined, and the groove width gradually decreases toward the fixing rule 343. The guide groove 3412 extends in the axial direction of the connector barrel 341, and the locking groove 3413 extends in the circumferential direction of the connector barrel 341. Thus, the stopper pin 3342 of the lock sleeve 334 and the grooves form a cam mechanism. Normally, the locking sleeve 334 and the accommodating barrel 331 are in a locking state under the elastic action of the torsion spring 333. When the connecting cylinder 341 is installed, the inclined groove wall of the unlocking groove 3411 shifts the stopper pin 3342 to move circumferentially along the inclined shape, thereby driving the locking sleeve 334 to rotate and disengage from the locked state. With the insertion of the connecting cylinder 341, the guide groove 3412 guides the unlocking groove 3411 to fall into the locking groove 3413, and at this time, the elastic force of the torsion spring 333 drives the locking sleeve 334 to return to the original locking state, so that the connecting cylinder 341 is locked. Meanwhile, in the installation process of the connecting cylinder 341, the connection between the worm 342 and the motor 36 can be completed at the same time, and at the moment, the automatic opening and closing control of the osteotomy ruler 34 can be completed by controlling the starting and stopping of the motor 36. The through hole 3311a and the locking groove 3413 are not different in size from each other so that the torsion spring 333 drives the pin 3342 to the limit position of the through hole 3311a or the locking groove 3413, thereby achieving axial displacement. Referring to fig. 12, osteotomy assembly 3 further includes a osteotome 35 connectable with mount 32.

The utility model discloses a cut bone instrument is when using, earlier by medical personnel's adjustment space navigation 1, disease and the space coordinate system of C type arm machine X-ray machine, makes the three obtain the space coordinate system that can associate to fixed space navigation 1's spatial position. Therefore, medical staff can prescribe a corresponding medical prescription according to patient data obtained by shooting through the X-ray machine of the C-arm machine, the medical prescription is input to the space navigation system 1, and the space navigation system 1 controls the osteotome 35 and the osteotome ruler 34 to complete corresponding osteotomy operation respectively. Certainly, the medical staff firstly uses the space navigation system 1 to complete preoperative planning operation according to patient data obtained by the C-arm machine X-ray machine shooting through the space navigation system 1, namely preoperative preparation operation and patient fixing of the patient are completed, the osteotome 35 is installed on the installation base 32 connected with the mechanical arm 11 of the space navigation system 1, and the medical staff operates the space navigation system 1 to complete osteotomy operation of the osteotome 35. Specifically, the installation position of the osteotome 35 is adjusted first, and the screw 322 is tightened, so that the osteotome 35 completes the designated osteotomy operation under the driving of the spatial navigation system 1. Then, the osteotome 35 is taken down, the osteotomy ruler 34 is installed on the installation seat 32 connected with the mechanical arm 11 of the space navigation system 1, the control parameter of the osteotomy ruler 34 is input, the mechanical arm 11 of the space navigation system 1 drives the osteotomy ruler 34 to move to the set space position, the start-stop parameter of the motor 36 is output by the space navigation system 1, and the osteotomy ruler 34 is opened to the required angle to complete the bone stretching operation. The medical staff can read the penetration depth and the opening and closing angle of the osteotomy ruler 34 by means of the graduation lines and angle lines on the surface of the osteotomy ruler 34.

To sum up, the utility model discloses a cut bone instrument utilizes osteotomy chi, osteotome and space navigation to cooperate to possess higher automation operation prospect. The osteotomy component and the space navigation system adopt a separated design, so that the disinfection and sterilization have better operating conditions and operating efficiency. The osteotomy ruler is provided with scale lines and angle lines respectively, so that the depth of penetration of the awl and the opening and closing angle can be measured simultaneously. The output parameters can be accurately controlled through a space navigation system, and the motor is controlled to be started or stopped, so that the distraction angle and the depth of the osteotomy ruler are accurately controlled. In addition, the speed of the motor can be accurately controlled to adapt to the spreading speed of the osteotomy ruler in different states, so that higher safety is obtained.

The above description is only an embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. An osteotomy tool, comprising a spatial navigation system (1) and an osteotomy assembly (3), said spatial navigation system (1) comprising a robotic arm (11), said osteotomy assembly (3) being connected to said robotic arm (11);

the osteotomy component (3) comprises a connecting flange (31) and a mounting seat (32);

one end of the mounting seat (32) is connected with one end of the connecting flange (31), and the other end of the connecting flange (31) is connected with the mechanical arm (11);

the other end of the mounting seat (32) is provided with a clamping head (321), and the clamping head (321) can be clamped by a tightening screw (322);

the osteotomy component (3) further comprises a locking structure (33), an osteotomy ruler (34) and a motor (36);

the locking structure (33) being connectable with the mounting seat (32), the osteotomy ruler (34) being connected with the locking structure (33);

the output end of the motor (36) is connected with the osteotomy ruler (34).

2. The osteotomy tool of claim 1, wherein said locking structure (33) comprises a receiving cylinder (331), a torsion spring (333), and a locking sleeve (334);

one end of the accommodating barrel (331) is open, and the motor (36) is arranged in the accommodating barrel (331);

the torsion spring (333) is sleeved outside the open end of the accommodating cylinder (331), and the locking sleeve (334) is sleeved outside the torsion spring (333);

the output shaft of motor (36) is overlapped and is equipped with first bearing (361) and adjustable ring (362), adjustable ring (362) are located first bearing (361) with between motor (36).

3. The osteotomy tool of claim 2, wherein an outer side wall of an open end of said receiving cylinder (331) is provided with first and second outwardly extending stop projections (3311,3312);

the first blocking protrusion (5363) and the second blocking protrusion (3311,3312) are sequentially arranged towards the open end of the accommodating cylinder (331), and the outer diameter of the second blocking protrusion (3312) is larger than that of the first blocking protrusion (3311);

the outer side wall of the first blocking bulge (3311) is provided with limiting through holes (3311 a) which are oppositely arranged, and the second blocking bulge (3312) is provided with a first connecting groove (3312 a);

the limiting through hole (3311 a) extends along the circumferential direction of the accommodating barrel (331);

a blocking ring (3341) corresponding to the first blocking protrusion (3311) is arranged on the inner wall of one end of the locking sleeve (334), and a second connecting groove (3341 a) is arranged on the blocking ring (3341);

both ends of the torsion spring (333) are respectively connected at the first connection groove (3312 a) and the second connection groove (3341 a);

the locking sleeve (334) is inserted with a limit pin (3342), and the limit pin (3342) is oppositely arranged and extends into the limit through hole (3311 a) and can move in the limit through hole (3311 a) along the circumferential direction of the accommodating cylinder (331).

4. The osteotomy tool of claim 3, wherein said osteotomy ruler (34) comprises a connector barrel (341), a worm (342), a fixed ruler (343), a movable ruler (344), and an angle ruler (345);

one end of the fixed ruler (343) is fixedly connected with one end of the connecting cylinder (341), and one end of the movable ruler (344) is hinged to the other end of the fixed ruler (343);

the worm (342) is rotatably arranged in the connecting cylinder (341), the end part of the worm is exposed, and the worm is provided with spiral teeth (342 a);

the other end of the movable ruler (344) is provided with worm gear teeth (344 a) which are meshed with spiral teeth (342 a) on the worm (342);

the angle ruler (345) is arc-shaped, and the movable ruler (344) is provided with an arc-shaped through hole (3441);

one end of the angle ruler (345) is fixed on the fixed ruler (343), and the movable ruler (344) is movably sleeved on the angle ruler (345) through the arc-shaped through hole (3441);

the worm (342) is connected with the fixed scale (343) through a second bearing (346), and a gap is formed between the second bearing (346) and the connecting cylinder (341);

an angle line (345 a) is arranged on the side surface of the angle ruler (345), and a scale mark (343 a) is arranged on one side, away from the movable ruler (344), of the fixed ruler (343).

5. The osteotomy tool of claim 4, wherein an end of said connector barrel (341) distal from said fixed rule (343) is provided with an unlocking groove (3411), a guiding groove (3412) and a locking groove (3413);

the unlocking groove (3411), the guide groove (3412) and the locking groove (3413) are arranged in order from the end of the connecting cylinder (341) toward the fixing rule (343);

the unlocking groove (3411), the guide groove (3412) and the locking groove (3413) are oppositely arranged in two groups;

the groove wall at one side of the unlocking groove (3411) is an inclined surface, and the groove width is gradually reduced towards the direction of the fixed ruler (343);

the guide groove (3412) extends in an axial direction of the connector barrel (341), and the lock groove (3413) extends in a circumferential direction of the connector barrel (341).

6. The osteotomy tool of claim 4, wherein an end of said fixed ruler (343) is provided with a cylindrical groove (3431), an end of said movable ruler (344) is provided with a cylindrical protrusion (3442);

the columnar projection (3442) is engaged in the columnar groove (3431) and can rotate therein around a columnar axis.

7. The osteotomy tool of claim 1, wherein said osteotomy assembly (3) further comprises a osteotome (35), said osteotome (35) being connectable with said mount (32).

8. The osteotomy tool of claim 1, wherein said spatial navigation system (1) further comprises a trolley (12) and a display (13);

the mechanical arm (11) and the display (13) are arranged on the trolley (12).

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