A patella osteotomy assisting device

Abstract

The present invention discloses a patella osteotomy assisting device, which relates to the technical field of medical devices. The key points of its technical solution are as follows: A width adjusting device is provided at the end of the electric control box body far from the first servo motor, and the output end of the first servo motor passes through the electric control box body and is connected to the width adjusting device; A first fixing plate is provided on the side wall of the first bracket close to the second bracket. The longitudinal section of the first fixing plate is circular, and a plurality of fixing nails are equidistantly arranged along the arc direction on the side wall of the first fixing plate far from the first bracket; A second fixing plate is provided on the side wall of the second bracket close to the first bracket. The width adjusting device has a first bracket and a second bracket at its two opposite ends respectively, and a thickness cutting adjusting device is provided on the side wall of the fixing connecting plate far from the first bracket. This patella osteotomy assisting device can hold the grip rod and make fine adjustments to the fixing connecting plate through automatic adjustment, enabling the assisting device to achieve the best clamping state for the patella; at the same time, the device can accurately control the thickness of the patella osteotomy.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, it relates to a patellar osteotomy assisting device. Background Art

[0002] With the increase in population aging and sports injuries, the incidence of knee osteoarthritis is getting higher and higher. Clinically, both patellofemoral joint replacement and total knee replacement involve the treatment of the patella.

[0003] When treating and replacing the patella, it is first necessary to clamp and remove the patella through patellar osteotomy, remove the diseased patella, and retain an appropriate patellar thickness. Then, holes are drilled in the remaining patella, and the mounting posts on the prosthesis are installed in the holes in the patella, and the prosthesis and the patella are clamped by the clamping insert of the patellar osteotomy assisting device, so that the prosthesis and the patella are fixed more firmly, thereby completing the patellar replacement surgery.

[0004] The existing patellar osteotomy assisting devices have the following technical defects:

[0005] 1. During the clamping process of the patella, the clamping force on the patella cannot be finely adjusted, and it is easy to have too large or too small clamping force, and the best clamping state cannot be achieved;

[0006] 2. In terms of controlling the cutting thickness, the existing technologies all observe the cutting thickness by the naked eye, which will make the cutting thickness inaccurate. Summary of the Invention

[0007] The purpose of the present invention is to provide a patellar osteotomy assisting device, which can hold the grip rod and make fine adjustments to the fixing plate through automatic adjustment, so that the assisting device can achieve the best clamping state for the patella; at the same time, the device can accurately control the thickness of patellar osteotomy.

[0008] The above technical object of the present invention is achieved through the following technical solutions: A patella osteotomy assisting device includes a grip rod. On the side wall of the grip rod, there are a forward and reverse control button one and a forward and reverse control button two. At the end of the grip rod, there is a servo motor one. On the side wall of the servo motor one away from the grip rod, there is an electric control box body. At the end of the electric control box body away from the servo motor one, there is a width adjusting device. The output end of the servo motor one passes through the electric control box body and is connected to the width adjusting device; inside the electric control box body, there are a control processor and a storage battery. On the side wall of the electric control box body, there are a display panel and a charging port; on the side wall of the first bracket close to the second bracket, there is a first fixing plate. The longitudinal section of the first fixing plate is circular. On the side wall of the first fixing plate away from the first bracket, there are a plurality of fixing nails arranged equidistantly along the arc direction; on the side wall of the second bracket close to the first bracket, there is a second fixing plate. On the side wall of the first bracket, there are a patella thickness measuring device and a rotation fixing device; at two opposite ends of the width adjusting device, there are respectively a first bracket and a second bracket. The first bracket and the second bracket are symmetrically distributed on both sides of the width adjusting device; on the side wall of the first bracket, there is a fixed connecting plate. On the side wall of the fixed connecting plate away from the first bracket, there is a thickness cutting and adjusting device. On the side wall of the second bracket, there is a limiting plate. The end of the thickness cutting and adjusting device away from the fixed connecting plate passes through the limiting plate.

[0009] By adopting the above technical solutions, the width adjusting device is connected to the motor, and the forward and reverse control button one is installed on the grip rod, enabling the operator to adjust the distance between the first fixing plate and the second fixing plate by pressing the forward and reverse control button one. This is not only convenient to operate but also can achieve stepless adjustment, achieving the best clamping effect on the top and bottom of the patella; by installing a patella thickness measuring device on the side wall of the first bracket, the thickness of patella osteotomy can be accurately controlled to achieve the best patella osteotomy effect.

[0010] The present invention is further configured as follows: The width adjusting device includes a lead screw, a slider three, a slide bar one, a slide bar two, a slider one, a slider two, a cross bar, and two connecting rods; the slider three is sleeved on the lead screw and the cross bar, and the slider three is in threaded connection with the lead screw. The end of the lead screw is fixedly connected to the output end of the servo motor one. The lead screw and the cross bar are perpendicular; the slide bar one and the slide bar two are symmetrically distributed on both sides of the lead screw. The horizontal angle between the slide bar one and the slide bar two and the lead screw is 15 - 30°; the slider one is sleeved on the cross bar and the slide bar one, and the slider two is sleeved on the cross bar and the slide bar two; one ends of the two connecting rods are respectively fixedly connected to the side walls of the slider one and the slider two away from the slider three, and the other ends of the two connecting rods are respectively fixedly connected to the first bracket and the second bracket.

[0011] By adopting the above technical solution, by using a lead screw structure, the distance between the first bracket and the second bracket can be adjusted, so as to achieve the effect of clamping and fixing the patella through the first fixing plate and the second fixing plate.

[0012] The present invention is further configured as follows: the thickness cutting and adjusting device includes a rectangular hollow bracket, a fourth slider, two second servo motors, two threaded rods, two bearings, a fourth slider and a distance detecting device; the rectangular hollow bracket includes two long rods, a first short rod and a second short rod, and the two ends of the two long rods are respectively fixedly connected to the side walls of the first short rod and the second short rod; the two second servo motors are respectively fixedly connected to two opposite side walls inside the first short rod, and the output ends of the two second servo motors are respectively fixedly connected to the ends of the two threaded rods; the two threaded rods are respectively located inside the two long rods, and the ends of the two threaded rods away from the second servo motors are respectively fixedly connected to the two bearings, and the side walls of the two bearings are respectively fixedly connected to the inner side wall of the second short rod; U-shaped chutes one are provided on the opposite side walls of the two long rods, the fourth slider is located in the U-shaped chute one, and the fourth slider is sleeved on the threaded rod, a knife hole penetrating through the fourth slider is provided at the top of the fourth slider, and the distance detecting device is respectively connected to the first short rod and the fourth slider.

[0013] By adopting the above technical solution, by installing a fourth slider on the rectangular hollow bracket, and the fourth slider can slide in the U-shaped chute one, the position of the knife hole can be adjusted, so as to achieve the cutting effect on the specified thickness of the patella; by installing a laser rangefinder on the rectangular hollow bracket, the moving precision can be improved, so that the thickness of the specified patella can be accurately cut.

[0014] The present invention is further configured as follows: the distance detecting device includes a laser rangefinder and a laser receiving tube, the laser rangefinder is fixedly connected to the side wall of the first short rod close to the fourth slider, and the light emitting end of the laser rangefinder is flush with the side wall of the first fixing plate away from the first bracket; the laser receiving tube is fixedly connected to the side wall of the fourth slider close to the first short rod.

[0015] By adopting the above technical solution, by installing a laser rangefinder on the first short rod and a laser receiving tube on the side wall of the fourth slider, the cutting thickness of the patella can be accurately controlled.

[0016] The present invention is further configured as follows: the patella thickness measuring device includes a scale and a thickness reading block, one end of the scale is hinged to the side wall of the first bracket, a U-shaped chute two is provided on the side wall of the second bracket, and the other end of the scale passes through the U-shaped chute two; the thickness reading block is fixedly connected to the side wall of the second bracket, and the reading end of the thickness reading block is flush with the side wall of the second fixing plate away from the second bracket.

[0017] By adopting the above technical solution, by providing a scale on the first bracket and the second bracket, the thickness of the patella can be directly obtained through the scale.

[0018] The present invention is further configured as: the rotation fixing device includes a knob, a gasket, and a fixing rod. The two opposite side walls of the gasket are respectively in contact with the knob and the first fixing plate. One end of the fixing rod is fixedly connected to the rotation axis of the knob, and the other end of the fixing rod sequentially passes through the first bracket and the second bracket.

[0019] By adopting the above technical solution, through the fixing rod, the distance between the first bracket and the second bracket can be fixed, preventing the phenomenon that the two brackets return after the patella is fixed.

[0020] In summary, the present invention has the following beneficial effects:

[0021] 1. In the technical solution of the present invention, by connecting the width adjustment device to the motor and installing a forward and reverse control button 1 on the grip rod, it is convenient for the operator to adjust the distance between the first fixing plate and the second fixing plate by pressing the forward and reverse control button 1. It is not only convenient to operate but also can achieve stepless adjustment, so as to achieve the best clamping effect on the top and bottom of the patella;

[0022] 2. In the technical solution of the present invention, by installing a patella thickness measurement device on the side wall of the first bracket, the thickness of the patella osteotomy can be accurately controlled, so as to achieve the best patella osteotomy effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a front view structural schematic diagram of a patella osteotomy assisting device in an embodiment of the present invention;

[0024] Figure 2 is a front view of a thickness adjustment cutting device of a patella osteotomy assisting device in an embodiment of the present invention;

[0025] Figure 3 is Figure 2 a sectional view taken along line A-A in

[0026] Figure 4 is a left view of a patella osteotomy assisting device in an embodiment of the present invention;

[0027] Figure 5 is a right view of a patella osteotomy assisting device in an embodiment of the present invention.

[0028] In the figure: 1, knife hole; 2, laser receiving tube; 3, first fixing plate; 4, laser rangefinder; 5, fixing nail; 6, first bracket; 7, fixing rod; 8, knob; 9, gasket; 10, slider one; 11, connecting rod; 12, slider three; 13, slide bar one; 14, control processor; 15, display panel; 16, servo motor one; 17, forward and reverse control button one; 18, grip bar; 19, forward and reverse control button two; 20, storage battery; 21, charging port; 22, electric control box; 23, lead screw; 24, slide bar two; 25, cross bar; 26, slider two; 27, thickness reading block; 28, scale; 29, second bracket; 30, limit plate; 31, hollow bracket; 32, second fixing plate; 33, slider four; 34, short rod one; 35, servo motor two; 36, long rod; 37, short rod two; 38, bearing; 39, threaded rod; 40, U-shaped chute one; 41, fixed connecting plate; 42, U-shaped chute two. Detailed implementation mode

[0029] The following is further detailed description of the present invention in conjunction with the attached Figures 1-5 drawings.

[0030] Embodiment: A patella osteotomy assisting device, as Figures 1 to 5 shown, includes a grip bar 18, on the side wall of the grip bar 18, a forward and reverse control button one 17 and a forward and reverse control button two 19 are fixedly installed, at the end of the grip bar 18, a servo motor one 16 is fixedly installed, on the side wall of the servo motor one 16 away from the grip bar 18, an electric control box 22 is fixedly installed, at the end of the electric control box 22 away from the servo motor one 16, a width adjusting device is installed, the output end of the servo motor one 16 passes through the electric control box 22 and is connected with the width adjusting device; inside the electric control box 22, a control processor 14 and a storage battery 20 are fixedly installed, on the side wall of the electric control box 22, a display panel 15 and a charging port 21 are fixedly installed; on the side wall of the first bracket 6 close to the second bracket 29, a first fixing plate 3 is fixedly installed, the longitudinal section of the first fixing plate 3 is circular, on the side wall of the first fixing plate 3 away from the first bracket 6, a plurality of fixing nails 5 are fixedly installed at equal intervals along the arc direction; on the side wall of the second bracket 29 close to the first bracket 6, a second fixing plate 32 is fixedly installed, on the side wall of the first bracket 6, a patella thickness measuring device and a rotation fixing device are installed; at two opposite ends of the width adjusting device, a first bracket 6 and a second bracket 29 are respectively fixedly installed, the first bracket 6 and the second bracket 29 are symmetrically distributed on both sides of the width adjusting device; on the side wall of the first bracket 6, a fixed connecting plate 41 is fixedly installed, on the side wall of the fixed connecting plate 41 away from the first bracket 6, a thickness cutting adjusting device is installed, on the side wall of the second bracket 29, a limit plate 30 is fixedly installed, and the end of the thickness cutting adjusting device away from the fixed connecting plate 41 passes through the limit plate 30.

[0031] In this embodiment, when the operator uses the osteotomy assisting device, by holding the grip, then placing the patella between the first fixing plate 3 and the second fixing plate 32, and then pressing the forward and reverse control button one 17 to the forward rotation position, at this time the information is transmitted to the control processor 14, and the control processor 14 adjusts the servo motor one 16 to rotate forward. The servo motor one 16 drives the width adjusting device to make the distance between the first bracket 6 and the second bracket 29 smaller. Finally, the fixing nail 5 on the first fixing plate 3 catches the bottom of the patella, and at the same time the second fixing plate 32 fixes the top of the patella, thus achieving the effect of fixing the patella. After the patella is fixed, the operator adjusts the thickness cutting adjusting device by pressing the forward and reverse control button two 19 to align the cutting edge with the position where the patella is desired to be cut, and then passes the saw through the thickness cutting adjusting device for osteotomy, thus achieving the effect of accurately cutting the thickness of the patella.

[0032] The width adjusting device includes a lead screw 23, a slider three 12, a slide bar one 13, a slide bar two 24, a slider one 10, a slider two 26, a cross bar 25 and two connecting rods 11; the slider three 12 is sleeved on the lead screw 23 and the cross bar 25, and the slider three 12 is threadedly connected to the lead screw 23. The end of the lead screw 23 is fixedly connected to the output end of the servo motor one 16, and the lead screw 23 and the cross bar 25 are perpendicular; the slide bar one 13 and the slide bar two 24 are symmetrically distributed on both sides of the lead screw 23, and the horizontal angle between the slide bar one 13 and the slide bar two 24 and the lead screw 23 is 15 - 30°; the slider one 10 is sleeved on the cross bar 25 and the slide bar one 13, and the slider two 26 is sleeved on the cross bar 25 and the slide bar two 24; one ends of the two connecting rods 11 are respectively fixedly connected to the side walls of the slider one 10 and the slider two 26 away from the slider three 12, and the other ends of the two connecting rods 11 are respectively fixedly connected to the first bracket 6 and the second bracket 29.

[0033] In this embodiment, when adjusting the distance between the first bracket 6 and the second bracket 29, the first servo motor 16 rotates to drive the lead screw 23 to rotate. The lead screw 23 is threadedly connected to the third slider 12, causing the third slider 12 to move towards the electronic control box body 22. Since the first slider 10 and the second slider 26 are both sleeved on the cross bar 25, during the movement of the third slider 12 towards the electronic control box body 22, the cross bar 25 drives the first slider 10 and the second slider 26 to move synchronously towards the electronic control box body 22. Also, because the first slider 10 is sleeved on the first slide bar 13 and the second slider 26 is sleeved on the second slide bar 24, and the horizontal angles between the first slide bar 13 and the second slide bar 24 and the lead screw 23 are 15 - 30°, the first slider 10 and the second slider 26 will move towards the third slider 12 while moving towards the electronic control box body 22. Since both the third slider 12 and the second slider 26 are connected to the first bracket 6 and the second bracket 29 through the connecting rod 11, the adjustment between the first bracket 6 and the second bracket 29 is realized, and finally the patella is fixed by the first fixing plate 3 and the second fixing plate 32. In this embodiment, this adjustment method realizes stepless adjustment, has high precision, is easy to control, and with the drive of the first servo motor 16, realizes an electrified operation, which not only improves the adjustment accuracy but also is convenient for the operator to use.

[0034] The thickness cutting adjustment device includes a rectangular hollow bracket 31, a fourth slider 33, two second servo motors 35, two threaded rods 39, two bearings 38, a fourth slider 33 and a distance detection device. The rectangular hollow bracket 31 includes two long rods 36, a first short rod 34 and a second short rod 37. The two ends of the two long rods 36 are respectively fixedly connected to the side walls of the first short rod 34 and the second short rod 37. The two second servo motors 35 are respectively fixedly connected to the two opposite side walls inside the first short rod 34, and the output ends of the two second servo motors 35 are respectively fixedly connected to the ends of the two threaded rods 39. The two threaded rods 39 are respectively located inside the two long rods 36, and the ends of the two threaded rods 39 far from the second servo motors 35 are respectively fixedly connected to the two bearings 38, and the side walls of the two bearings 38 are respectively fixedly connected to the inner side wall of the second short rod 37. U-shaped chutes 40 are opened on the opposite side walls of the two long rods 36. The fourth slider 33 is located in the U-shaped chute 40 and is sleeved on the threaded rod 39. A knife hole 1 penetrating the fourth slider 33 is opened at the top of the fourth slider 33, and the distance detection device is respectively connected to the first short rod 34 and the fourth slider 33.

[0035] In this embodiment, after the operator fixes the patella, the operator presses the forward and reverse control button two 19 on the grip rod 18 and presses the forward and reverse control button two 19 to the forward rotation position. At this time, the information is transmitted to the control processor 14, and the control processor 14 adjusts the two servo motors two 35 so that the two servo motors two 35 rotate forward simultaneously. The servo motor two 35 rotates, driving the threaded rod 39 to rotate. Since the slider four 33 is sleeved on the threaded rod 39 and the slider four 33 is located in the U-shaped chute one 40, when the threaded rod 39 rotates, the slider four 33 will move along the U-shaped chute one 40. When the knife hole 1 aligns with the position where the patella needs to be cut, stop pressing the forward and reverse control button two 19, and then cut the patella through the saw blade passing through the knife hole 1.

[0036] The distance detection device includes a laser rangefinder 4 and a laser receiving tube 2. The laser rangefinder 4 is fixedly connected to the side wall of the short rod one 34 close to the slider four 33, and the light emitting end of the laser rangefinder 4 is flush with the side wall of the first fixing plate 3 away from the first bracket 6; the laser receiving tube 2 is fixedly connected to the side wall of the slider four 33 close to the short rod one 34.

[0037] In this embodiment, the laser rangefinder 4 emits laser to the laser receiving tube 2. At this time, the generated distance information is transmitted to the control processor 14, and the control processor 14 processes the information and transmits it to the display panel 15. In this way, the operator can directly obtain the accurate cutting thickness through the display panel 15; in this embodiment, the side wall of the first fixing plate 3 away from the first bracket 6 is flush with the light emitting end of the laser rangefinder 4. In this way, it can be ensured that when the slider four 33 moves, the distance between the laser receiving tube 2 and the laser rangefinder 4 is equal to the distance from the laser receiving tube 2 to the bottom of the patella, so that the operator can obtain an accurate thickness cutting value.

[0038] The patella thickness measuring device includes a scale 28 and a thickness reading block 27. One end of the scale 28 is hinged to the side wall of the first bracket 6, and the side wall of the second bracket 29 is provided with a U-shaped chute two 42. The other end of the scale 28 passes through the U-shaped chute two 42; the thickness reading block 27 is fixedly connected to the side wall of the second bracket 29, and the reading end of the thickness reading block 27 is flush with the side wall of the second fixing plate 32 away from the second bracket 29.

[0039] In this embodiment, when the operator adjusts the distance between the first bracket 6 and the second bracket 29, since the scale 28 is slidably connected to the U-shaped chute two 42 on the second bracket 29, the second bracket 29 will slide on the scale 28. After the patella is fixed, the operator can directly obtain the thickness value of the patella through the thickness reading block 27; in this embodiment, the reading end of the thickness reading block 27 is flush with the side wall of the second fixing plate 32 away from the second bracket 29. In this way, the numerical value of the patella thickness can be accurately obtained.

[0040] The rotation fixing device includes a knob 8, a gasket 9 and a fixing rod 7. The two opposite side walls of the gasket 9 are respectively in contact with the knob 8 and the first fixing plate 3. One end of the fixing rod 7 is fixedly connected to the rotation axis of the knob 8. The other end of the fixing rod 7 sequentially passes through the first bracket 6 and the second bracket 29, and the fixing rod 7 is threadedly connected to the first bracket 6 and the second bracket 29 respectively.

[0041] In this embodiment, after the patella is fixed, the operator can rotate the knob 8 to connect the fixing rod 7 to the first bracket 6 and the second bracket 29, so as to prevent the first bracket 6 and the second bracket 29 from retracting, which may result in insufficient clamping force on the patella.

[0042] Working principle: The width adjustment device is connected to the motor. The forward and reverse control button 17 is installed on the grip 18, which enables the operator to adjust the distance between the first fixing plate 3 and the second fixing plate 32 by pressing the forward and reverse control button 17. It is not only convenient to operate, but also can achieve stepless adjustment, so as to achieve the best clamping effect on the top and bottom of the patella. By installing the patella thickness measuring device on the side wall of the first bracket 6, the thickness of the patella osteotomy can be accurately controlled, so as to achieve the best patella osteotomy effect.

[0043] This specific embodiment is only an interpretation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions according to needs, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A patella osteotomy assisting device, comprising a grip rod (18), characterized in that: The side wall of the grip rod (18) is provided with a forward and reverse control button one (17) and a forward and reverse control button two (19). The end of the grip rod (18) is provided with a servo motor one (16). The side wall of the servo motor one (16) away from the grip rod (18) is provided with an electric control box body (22). The end of the electric control box body (22) away from the servo motor one (16) is provided with a width adjusting device. The output end of the servo motor one (16) passes through the electric control box body (22) and is connected with the width adjusting device. A control processor (14) and a storage battery (20) are arranged in the electric control box body (22). A display panel (15) and a charging port (21) are arranged on the side wall of the electric control box body (22). The two opposite ends of the width adjusting device are respectively provided with a first support (6) and a second support (29). The first support (6) and the second support (29) are symmetrically distributed on both sides of the width adjusting device. The side wall of the first support (6) close to the second support (29) is provided with a first fixing plate (3). The longitudinal section of the first fixing plate (3) is circular. A plurality of fixing nails (5) are arranged at equal intervals along the arc direction on the side wall of the first fixing plate (3) away from the first support (6). The side wall of the second support (29) close to the first support (6) is provided with a second fixing plate (32). A patella thickness measuring device and a rotation fixing device are arranged on the side wall of the first support (6). A fixing connecting plate (41) is arranged on the side wall of the first support (6). A thickness cutting adjusting device is arranged on the side wall of the fixing connecting plate (41) away from the first support (6). A limiting plate (30) is arranged on the side wall of the second support (29). The end of the thickness cutting adjusting device away from the fixing connecting plate (41) passes through the limiting plate (30). The width adjusting device comprises a lead screw (23), a slider three (12), a slide bar one (13), a slide bar two (24), a slider one (10), a slider two (26), a cross bar (25) and two connecting rods (11). The slider three (12) is sleeved on the lead screw (23) and the cross bar (25), and the slider three (12) is in threaded connection with the lead screw (23). The end of the lead screw (23) is fixedly connected with the output end of the servo motor one (16). The lead screw (23) and the cross bar (25) are perpendicular. The slide bar one (13) and the slide bar two (24) are symmetrically distributed on both sides of the lead screw (23). The slider one (10) is sleeved on the cross bar (25) and the slide bar one (13). The slider two (26) is sleeved on the cross bar (25) and the slide bar two (24). One ends of the two connecting rods (11) are respectively fixedly connected with the side walls of the slider one (10) and the slider two (26) away from the slider three (12). The other ends of the two connecting rods (11) are respectively fixedly connected with the first support (6) and the second support (29). The thickness cutting adjustment device includes a rectangular hollow bracket (31), a fourth slider (33), two second servo motors (35), two threaded rods (39), two bearings (38), a fourth slider (33) and a distance detection device; the rectangular hollow bracket (31) includes two long rods (36), a first short rod (34) and a second short rod (37), and the two ends of the two long rods (36) are respectively fixedly connected to the side walls of the first short rod (34) and the second short rod (37); the output ends of the two second servo motors (35) are respectively fixedly connected to the ends of the two threaded rods (39); the two threaded rods (39) are respectively located in the two long rods (36); U-shaped first chutes (40) are provided on the opposite side walls of the two long rods (36), the fourth slider (33) is located in the U-shaped first chute (40), and the fourth slider (33) is sleeved on the threaded rod (39), a knife hole (1) penetrating through the fourth slider (33) is provided at the top of the fourth slider (33), and the distance detection device is respectively connected to the first short rod (34) and the fourth slider (33).

2. The patella osteotomy assistance device according to claim 1, characterized in that: The distance detection device includes a laser rangefinder (4) and a laser receiving tube (2), the laser rangefinder (4) is fixedly connected to the side wall of the first short rod (34) close to the fourth slider (33), and the light emitting end of the laser rangefinder (4) is flush with the side wall of the first fixing plate (3) away from the first bracket (6); the laser receiving tube (2) is fixedly connected to the side wall of the fourth slider (33) close to the first short rod (34).

3. The a kind of patellar osteotomy assisting device according to claim 1, characterized in that: The patella thickness measuring device includes a scale (28) and a thickness reading block (27), one end of the scale (28) is hinged to the side wall of the first bracket (6), and a U-shaped second chute (42) is provided on the side wall of the second bracket (29), and the other end of the scale (28) passes through the U-shaped second chute (42); the thickness reading block (27) is fixedly connected to the side wall of the second bracket (29), and the reading end of the thickness reading block (27) is flush with the side wall of the second fixing plate (32) away from the second bracket (29).

4. The patella osteotomy assisting device according to claim 1, wherein: The rotation fixing device includes a knob (8), a gasket (9) and a fixing rod (7), the two opposite side walls of the gasket (9) are respectively in contact with the knob (8) and the first fixing plate (3), one end of the fixing rod (7) is fixedly connected to the rotation axis center of the knob (8), and the other end of the fixing rod (7) sequentially passes through the first bracket (6) and the second bracket (29).

5. The a kind of patella osteotomy assisting device according to claim 1, characterized in that: The horizontal angles between the first slide bar (13) and the second slide bar (24) and the lead screw (23) are 15 - 30°.

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