Positioner device and process for establishing patella tunnel under total arthroscope

Abstract

The invention discloses a positioner device and process for establishing a patella tunnel under a total arthroscope, and relates to the technical field of medical equipment, the positioner device comprises a positioner provided with a supporting part, a first positioning mechanism and a second positioning mechanism, and a guider movably clamped on the positioner; a positioning and guiding system of the equipment effectively reduces the surgical risk and difficulty, improves the surgical efficiency, shortens the surgical time and plays a role in efficient assistance; the equipment can adapt to patella with different shapes and sizes, and is convenient to use; the first positioning mechanism of the equipment can accurately find and position a bone tunnel, so that the positioning precision is effectively improved; the hole at the tip of the guider of the device can accurately position the bone tunnel outlet to prevent the bone tunnel from being too long or too short; the angle control positioning design of the guider of the equipment prevents fracture of a bone tunnel; by means of the device, low-age doctors can complete the operation possibly.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a locator device and a process for establishing a patellar bone tunnel under full arthroscopy. Background Art

[0002] Patellar dislocation is common in young people and athletes. The overall annual incidence is approximately 29 per 100,000 people. It is more common in adolescents and young adults aged 10-20 years, especially during the period of rapid growth in adolescence. The incidence rate in females is higher than that in males, approximately 1.4-2 times that of males. It can seriously affect daily life and sports. If dislocation occurs more than once, surgical treatment is often required. Currently, the most common treatment method is medial patellofemoral ligament (MPFL) reconstruction. Arthroscopic medial patellofemoral ligament reconstruction is becoming the preferred choice of more and more patients due to its advantages such as minimal invasiveness, rapid recovery, good results, and minimal impact on aesthetics. It has also become the preferred procedure of sports medicine physicians.

[0003] The difficulty of arthroscopic surgery lies in the precise positioning of the patellar bone tunnel. Improper positioning can directly affect the surgical outcome and, in severe cases, cause patellar fractures. Precise positioning requires precise positioning tools, but currently, there are no dedicated positioning tools. During surgery, surgeons rely on feel and experience to establish the patellar bone tunnel, failing to achieve ideal standard positioning. This poses various health risks to the patient and discourages many inexperienced surgeons, hindering the clinical application and development of this technology.

[0004] In order to solve the above problems, a locator device and process for establishing a patellar bone tunnel under full arthroscopy were specially designed and invented. The positioning and guiding system of the device effectively reduces the surgical risk and difficulty, improves the surgical efficiency, shortens the operation time, and plays an efficient auxiliary role; the device can adapt to patellae of different shapes and sizes and is easy to use; the first positioning mechanism of the device can accurately find and locate the bone tunnel, effectively improving the positioning accuracy; the hole at the tip of the guide of the device can accurately locate the bone tunnel exit to prevent the bone tunnel from being too long or too short; the angle-controlled positioning design of the guide of the device prevents bone tunnel rupture; the device makes it possible for junior doctors to complete such operations. Summary of the Invention

[0005] In response to the above technical problems, the present invention provides a locator device and process for establishing a patellar bone tunnel under full arthroscopy to solve the above problems.

[0006] The technical solution used in the present invention is: a positioner device and process for establishing a patellar bone tunnel under full arthroscopy, comprising: a positioner provided with a support portion, a first positioning mechanism and a second positioning mechanism, and a guide movably mounted on the positioner; The first positioning mechanism includes a support frame, and a rectangular slot is provided on the side of the support frame; The second positioning mechanism includes: a horizontal bar, a scale plate, a square bar, a sleeve bar, an indicator needle, a vertical frame, a marking pen and a round bar; the horizontal bar is slidably installed in a rectangular slot on the side of the support frame; the scale plate is fixedly installed on the support frame; the square bar is fixedly installed on the rear side of the horizontal bar; the sleeve bar is sleeved on the square bar; the indicator needle is fixedly installed on the upper end of the horizontal bar, and the indicator needle indicates the corresponding scale on the scale plate; there are two vertical frames, one vertical frame is fixedly connected to the bottom of the horizontal bar through a rod, and the other vertical frame is fixedly connected to the bottom of the sleeve bar through a rod; there are two marking pens, and the two are slidably installed on the two vertical frames respectively; the inner end of the round bar is fixedly connected to the through hole on one marking pen, and the outer end of the round bar is slidably connected to the through hole on the other marking pen.

[0007] Preferably, a spring is installed on the side of the sleeve rod, and the other end of the spring is connected to the side of the cross bar.

[0008] Preferably, a spring is installed on the rectangular block above the marking pen, the upper part of the spring is connected to the corresponding vertical frame, and a through hole is provided on the side of the rectangular block.

[0009] Preferably, the support part includes: a support, a lower support, an upper support, a clamping rod and a clamping slot frame; there are two supports, the two supports are movably installed in the designated area, and a number of clamping holes are provided on the side of the support; the two rods at the lower end of the lower support are respectively slidably installed in the two supports, and the lower ends of the two rods of the two lower supports are provided with springs, and the other ends of the springs are connected to the corresponding inside of the supports, grooves are provided on both sides of the lower support, and the lower support is provided with length markings; there are two clamping rods, the two clamping rods are respectively inserted into the circular holes of the two bent rods on the side of the lower support, and the two clamping rods are intermittently engaged with the clamping holes on the two supports; the upper bracket is fixedly connected to the lower bracket in a vertical direction, grooves are provided on both sides of the upper bracket, and the upper bracket is provided with a length marking; the clamping slot frame is fixedly installed on the rear side of the upper bracket.

[0010] Preferably, the first positioning mechanism also includes: a first clamping rod, a top plate, gear I, a second clamping rod, gear II and a support frame; there are two first clamping rods, and the two first clamping rods are respectively slidably installed in the grooves on both sides of the lower bracket; there are two top plates, and the small rods on the two top plates are respectively slidably installed in the circular holes on the first clamping rod, and a spring is provided on the periphery of the small rod on the top plate, and the other end of the spring is connected to the first clamping rod, and the lower end surface of the top plate contacts the upper end surface of the lower bracket; the shaft of gear I is rotatably installed in the circular hole of the lower end plate of the lower bracket, and the racks on the sides of the two first clamping rods are meshed with gear I; there are two second clamping rods, and the two second clamping rods are respectively slidably installed in the grooves on both sides of the upper bracket; gear II is rotatably installed in the circular hole on gear I, and gear II and the racks on the two second clamping rods are meshed with each other; the support frame is fixedly installed on the second clamping rod above.

[0011] Preferably, racks are fixedly mounted on the side surfaces of the two first clamping rods respectively.

[0012] Preferably, racks are fixedly mounted on the two second clamping rods respectively.

[0013] Preferably, the guide comprises: a guide frame, a V-shaped slide rod, a hollow rod and a Kirschner wire; the guide frame is movably mounted on the slot frame; an arc-shaped groove is provided on the guide frame; one end of the V-shaped slide rod is slidably mounted in the arc-shaped groove on the guide frame, and the other tip of the V-shaped slide rod is provided with a hole; the hollow rod is fixedly mounted on the guide frame; the Kirschner wire is slidably mounted on the hollow rod.

[0014] A process for establishing a patellar bone tunnel under full arthroscopic surgery uses a locator device for establishing a patellar bone tunnel under full arthroscopic surgery, including the following steps: S1: First, two supports are manually placed on both sides of the patient's legs. Then, a first clamping rod is manually pushed and pulled according to the size of the patient's patella. The rack on this first clamping rod drives gear I to rotate, thereby driving the other first clamping rod to move outward or inward at the same time, so that the two first clamping rods are clamped on the left and right sides of the patient's patella. At this time, the two top plates are respectively pressed on the upper end surfaces of the two lower supports to prevent the two first clamping rods from moving. Then, a second clamping rod is manually pushed and pulled according to the size of the patient's patella. The rack on this second clamping rod drives gear II to rotate, thereby driving the other second clamping rod to move inward or outward, so that the two second clamping rods contact the upper and lower sides of the patient's patella, thereby determining the center point of the patient's patella. At this time, the scale plate displays the specific distance between the second clamping rod and the center point of the patella; S2: The distance between the second clamping rod and the center point of the patella is manually determined based on the scale plate, with the help of the scale plate. Then, the crossbar is manually pushed away from the support frame until it is accurately located in the middle and upper third of the patella, thus determining the bone tunnel exit point. S3: Manually pull the rod outward until the rod is located at the edge of the patellar outer wall to determine the bone tunnel entrance point; S4: Manually pull the rod downward, and the rod drives the two marking pens to move downward simultaneously, so that the two marking pens mark the entrance and exit of the bone tunnel on the patient's patella; S5: Manually remove the guide from the slot frame, use the tip of the V-shaped slide rod to align with the marked bone tunnel exit, and use the Kirschner needle to align with the bone tunnel entrance to establish the bone tunnel.

[0015] The beneficial effects of the present invention compared with the prior art are: 1. The present invention manually places two supports on both sides of the patient's legs, and manually pushes and pulls a second clamping rod according to the size of the patient's patella. The rack on this second clamping rod drives gear II to rotate, which in turn drives the other second clamping rod to move inward or outward, so that the two second clamping rods contact the upper and lower sides of the patient's patella, thereby determining the center point of the patient's patella. The operation is simple.

[0016] The present invention manually pushes the cross bar in a direction away from the support frame, so that the cross bar is accurately located at the upper middle third of the patella, and the bone tunnel exit point is determined, thereby effectively saving manpower.

[0017] The present invention manually pulls the round rod downward, and the round rod drives two marking pens to move downward at the same time, so that the two marking pens mark the entrance and exit of the bone tunnel on the patient's patella. The operation is simple, making it possible for junior doctors to complete such operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the overall structure of the present invention from a first angle.

[0019] Figure 2 This is a schematic structural diagram from a second angle of the overall structure of the present invention.

[0020] Figure 3 It is a partial structural diagram of the positioner structure of the present invention.

[0021] Figure 4 Schematic diagram of the support structure of the positioner of the present invention.

[0022] Figure 5 Schematic diagram of the first positioning mechanism in the positioner of the present invention.

[0023] Figure 6 It is a partial structural diagram of the first positioning mechanism in the positioner of the present invention.

[0024] Figure 7 Schematic diagram of the second positioning mechanism in the positioner of the present invention.

[0025] Figure 8 This is a schematic diagram of the first angle structure of the guide of the present invention.

[0026] Figure 9 This is a schematic diagram of the second angle structure of the guide of the present invention.

[0027] Figure 1: locator; 4: guide; 101: support; 102: lower bracket; 103: upper bracket; 104: clamping rod; 105: slot frame; 201: first clamping rod; 202: top plate; 203: gear I; 204: second clamping rod; 205: gear II; 206: support frame; 301: cross bar; 302: scale plate; 303: square bar; 304: sleeve rod; 305: indicator needle; 306: vertical frame; 307: marking pen; 308: round rod; 401: guide frame; 402: V-shaped slide bar; 403: hollow rod; 404: Kirschner wire. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be further specifically described below through examples and in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be noted that the terms "up", "down", "in", "out", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0030] Example: like Figures 1-9 As shown, a positioner device for establishing a patellar bone tunnel under full arthroscopy comprises: a positioner 1 provided with a support portion, a first positioning mechanism and a second positioning mechanism, and a guide 4 movably mounted on the positioner 1; like Figure 5 As shown, the first positioning mechanism includes a support frame 206 , and a rectangular slot is provided on the side of the support frame 206 .

[0031] like Figure 7As shown, the second positioning mechanism includes: a crossbar 301, a scale plate 302, a square rod 303, a sleeve rod 304, an indicator needle 305, a vertical frame 306, a marking pen 307 and a round rod 308; the crossbar 301 is slidably mounted in the rectangular slot on the side of the support frame 206; the scale plate 302 is fixedly mounted on the support frame 206; the square rod 303 is fixedly mounted on the rear side of the crossbar 301; the sleeve rod 304 is sleeved on the square rod 303; the indicator needle 305 is fixedly mounted on the upper end of the crossbar 301, and the indicator needle 305 indicates the corresponding scale on the scale plate 302; there are two vertical frames 306, one One vertical frame 306 is fixedly connected to the bottom of the horizontal bar 301 through a rod, and the other vertical frame 306 is fixedly connected to the bottom of the sleeve rod 304 through a rod; there are two marking pens 307, and the two are slidably installed on the two vertical frames 306 respectively; the inner end of the round rod 308 is fixedly connected to the through hole on one marking pen 307, and the outer end of the round rod 308 is slidably connected to the through hole on the other marking pen 307; specifically, the round rod 308 is manually pulled downward, and the round rod 308 drives the two marking pens 307 to move downward at the same time, so that the two marking pens 307 mark the entrance and exit of the bone canal on the patient's patella.

[0032] like Figure 7 As shown, a spring is installed on the side of the sleeve rod 304, and the other end of the spring is connected to the side of the cross bar 301.

[0033] like Figure 7 As shown, a spring is installed on the rectangular block above the marking pen 307, and the upper part of the spring is connected to the corresponding vertical frame 306. A through hole is provided on the side of the rectangular block, and the two marking pens 307 can locate the patellar canal.

[0034] like Figure 4 As shown, the support part includes: a support 101, a lower support 102, an upper support 103, a card rod 104 and a card slot frame 105; there are two supports 101, and the two supports 101 are movably installed in the designated area, and a number of card holes are provided on the side of the support 101; the two rods at the lower end of the lower support 102 are slidably installed in the two supports 101 respectively, and the lower ends of the two rods of the two lower supports 102 are provided with springs, and the other ends of the springs are connected to the corresponding support 101 inside, and grooves are provided on both sides of the lower support 102, and the lower support 102 is provided with a length mark; there are two card rods 104, and the two card rods 104 are respectively inserted into the circular holes of the two bent rods on the side of the lower support 102, and the two card rods 104 are intermittently engaged with the card holes on the two supports 101; the upper support 103 is fixedly connected to the lower support 102 in a vertical direction, and grooves are provided on both sides of the upper support 103, and the upper support 103 is provided with a length mark; the card slot frame 105 is fixedly installed on the rear side of the upper support 103.

[0035] like Figure 5 、 Figure 6As shown, the first positioning mechanism also includes: a first clamping rod 201, a top plate 202, a gear I 203, a second clamping rod 204, a gear II 205 and a support frame 206; there are two first clamping rods 201, and the two first clamping rods 201 are respectively slidably mounted in the grooves on both sides of the lower bracket 102; there are two top plates 202, and the small rods on the two top plates 202 are respectively slidably mounted in the round holes on the first clamping rod 201, and a spring is provided on the periphery of the small rod on the top plate 202, and the other end of the spring is connected to the first clamping rod 201, and the lower end surface of the top plate 202 contacts the upper end surface of the lower bracket 102. 202 can prevent the first clamping rod 201 from shifting without the action of external force; the axis of gear I 203 is rotatably installed in the circular hole of the lower end plate of the lower bracket 102, and the racks on the sides of the two first clamping rods 201 are engaged with gear I 203; there are two second clamping rods 204, and the two second clamping rods 204 are respectively slidably installed in the grooves on both sides of the upper bracket 103; gear II 205 is rotatably installed in the circular hole on gear I 203, and gear II 205 is engaged with the racks on the two second clamping rods 204; the support frame 206 is fixedly installed on the upper second clamping rod 204.

[0036] like Figure 5 、 Figure 6 As shown, racks are fixedly mounted on the sides of the two first clamping rods 201 .

[0037] like Figure 5 、 Figure 6 As shown, racks are fixedly mounted on the two second clamping rods 204 .

[0038] like Figure 8 、 Figure 9 As shown, the guide 4 includes: a guide frame 401, a V-shaped slide bar 402, a hollow rod 403 and a Kirschner wire 404; the guide frame 401 is movably mounted on the slot frame 105; an arc-shaped groove is provided on the guide frame 401; one end of the V-shaped slide bar 402 is slidably mounted in the arc-shaped groove on the guide frame 401, and the other tip of the V-shaped slide bar 402 is provided with a hole, and the hole can pass through the locator 1.5mm round rod 009; the hollow rod 403 is fixedly mounted on the guide frame 401; the Kirschner wire 404 is slidably mounted on the hollow rod 403.

[0039] This embodiment provides a process for establishing a patellar tunnel under full arthroscopic surgery, which uses the device described in the embodiment and includes the following steps: When establishing the patellar canal, first, the two supports 101 are manually placed on both sides of the patient's legs. Then, a first clamping rod 201 is manually pushed and pulled according to the size of the patient's patella. The rack on the first clamping rod 201 drives the gear I 203 to rotate, thereby driving the other first clamping rod 201 to move outward or inward at the same time, so that the two first clamping rods 201 are stuck on the left and right sides of the patient's patella. At this time, the two top plates 202 are respectively pressed on the upper end surfaces of the two lower brackets 102 to prevent the two first clamping rods 201 from moving. Then, a second clamping rod 204 is manually pushed and pulled according to the size of the patient's patella. The rack on the second clamping rod 204 drives the gear II 205 to rotate, thereby driving the other second clamping rod 204 to move inward or outward, so that the two second clamping rods 204 contact the upper and lower sides of the patient's patella, thereby determining the center point of the patient's patella, and at this time the scale plate 302 shows the specific distance between the second clamping rod 204 and the center point of the patella; Then, the distance between the second clamping rod 204 and the center point of the patella is manually determined based on the distance between the second clamping rod 204 and the center point of the patella, with the help of the scale on the scale plate 302. Then, the cross bar 301 is manually pushed away from the support frame 206 so that the cross bar 301 is accurately located in the middle and upper third of the patella, thereby determining the bone tunnel exit point. Then, the sleeve rod 304 is manually pulled outward so that the round rod 308 is located at the edge of the outer wall of the patella, thereby determining the entrance point of the bone tunnel; Then, the round rod 308 is manually pulled downward, and the round rod 308 drives the two marking pens 307 to move downward at the same time, so that the two marking pens 307 mark the entrance and exit of the bone tunnel on the patient's patella; Finally, the guide 4 is manually removed from the slot frame 105, the tip of the V-shaped slide bar 402 is aligned with the marked bone tunnel exit, and the Kirschner wire 404 is aligned with the bone tunnel entrance to establish the bone tunnel.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A locator device for establishing a patellar tunnel under full arthroscopic surgery, characterized in that: include: A positioner (1) is provided with a support portion, a first positioning mechanism, and a second positioning mechanism, and a guide (4) movably mounted on the positioner (1); The first positioning mechanism comprises a support frame (206), and a rectangular slot is provided on a side surface of the support frame (206); The second positioning mechanism comprises: a crossbar (301), a scale plate (302), a square bar (303), a sleeve bar (304), an indicator needle (305), a vertical frame (306), a marking pen (307) and a round bar (308); the crossbar (301) is slidably mounted in a rectangular slot on the side of the support frame (206); the scale plate (302) is fixedly mounted on the support frame (206); the square bar (303) is fixedly mounted on the rear side of the crossbar (301); the sleeve bar (304) is sleeved on the square bar (303); the indicator needle (305) is fixedly mounted on the crossbar (301) 1) At the upper end, the indicator needle (305) indicates the corresponding scale on the scale plate (302); there are two vertical frames (306), one vertical frame (306) is fixedly connected to the lower part of the horizontal rod (301) through a rod, and the other vertical frame (306) is fixedly connected to the lower part of the sleeve rod (304) through a rod; there are two marking pens (307), and the two are slidably mounted on the two vertical frames (306); the inner end of the round rod (308) is fixedly connected to the through hole on one marking pen (307), and the outer end of the round rod (308) is slidably connected to the through hole on the other marking pen (307).

2. The locator device for establishing the patellar tunnel under full arthroscopic surgery according to claim 1, characterized in that: A spring is installed on the side of the sleeve rod (304), and the other end of the spring is connected to the side of the cross rod (301).

3. The locator device for establishing the patellar tunnel under full arthroscopic surgery according to claim 1, characterized in that: A spring is installed on the rectangular block above the marking pen (307), the upper part of the spring is connected to the corresponding vertical frame (306), and a through hole is provided on the side of the rectangular block.

4. The locator device for establishing the patellar tunnel under full arthroscopic surgery according to claim 1, characterized in that: The support portion comprises: a support (101), a lower support (102), an upper support (103), a clamping rod (104) and a clamping slot frame (105); there are two supports (101), the two supports (101) are movably installed in a designated area, and a plurality of clamping holes are provided on the side of the support (101); the two rods at the lower end of the lower support (102) are respectively slidably installed in the two supports (101), the lower ends of the two rods of the two lower supports (102) are provided with springs, the other ends of the springs are connected to the inside of the corresponding support (101), and the lower supports (101) are provided with springs. 2) are provided with grooves on both sides, and the lower bracket (102) is provided with a length mark; there are two clamping rods (104), and the two clamping rods (104) are respectively inserted into the round holes of the two bent rods on the side of the lower bracket (102), and the two clamping rods (104) are intermittently engaged with the clamping holes on the two supports (101); the upper bracket (103) is fixedly connected to the lower bracket (102) in a vertical direction, and grooves are provided on both sides of the upper bracket (103), and the upper bracket (103) is provided with a length mark; the clamping slot frame (105) is fixedly installed on the rear side of the upper bracket (103).

5. The locator device for establishing the patellar tunnel under full arthroscopic surgery according to claim 1, characterized in that: The first positioning mechanism further comprises: a first clamping rod (201), a top plate (202), a gear I (203), a second clamping rod (204), a gear II (205) and a support frame (206); there are two first clamping rods (201), and the two first clamping rods (201) are respectively slidably mounted in the grooves on both sides of the lower bracket (102); there are two top plates (202), and the small rods on the two top plates (202) are respectively slidably mounted in the round holes on the first clamping rod (201), and a spring is provided on the periphery of the small rod on the top plate (202), and the other end of the spring is connected to the first clamping rod (201), and the lower end of the top plate (202) is provided with a spring. The end face contacts the upper end face of the lower bracket (102); the shaft of the gear I (203) is rotatably mounted in the circular hole of the lower end plate of the lower bracket (102), and the racks on the sides of the two first clamping rods (201) are meshed with the gear I (203); there are two second clamping rods (204), and the two second clamping rods (204) are slidably mounted in the grooves on both sides of the upper bracket (103); the gear II (205) is rotatably mounted in the circular hole on the gear I (203), and the gear II (205) and the racks on the two second clamping rods (204) are meshed with each other; the support frame (206) is fixedly mounted on the second clamping rod (204) above.

6. The locator device for establishing the patellar tunnel under full arthroscopic surgery according to claim 5, characterized in that: Racks are fixedly mounted on the sides of the two first clamping rods (201).

7. The locator device for establishing the patellar tunnel under full arthroscopic surgery according to claim 5, characterized in that: Racks are respectively fixedly mounted on the two second clamping rods (204).

8. The locator device for establishing the patellar tunnel under full arthroscopic surgery according to claim 1, characterized in that: The guide (4) comprises: a guide frame (401), a V-shaped slide bar (402), a hollow rod (403) and a Kirschner wire (404); the guide frame (401) is movably mounted on the slot frame (105); an arc-shaped groove is provided on the guide frame (401); one end of the V-shaped slide bar (402) is slidably mounted in the arc-shaped groove on the guide frame (401), and the other tip of the V-shaped slide bar (402) is provided with a hole; the hollow rod (403) is fixedly mounted on the guide frame (401); and the Kirschner wire (404) is slidably mounted on the hollow rod (403).

9. A process for using a locator for establishing a patellar bone tunnel under full arthroscopic surgery, using the locator device for establishing a patellar bone tunnel under full arthroscopic surgery according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: First, two supports (101) are manually placed on both sides of the patient's legs. Then, a first clamping rod (201) is manually pushed and pulled according to the size of the patient's patella. The rack on the first clamping rod (201) drives the gear I (203) to rotate, thereby driving the other first clamping rod (201) to move outward or inward at the same time, so that the two first clamping rods (201) are stuck on the left and right sides of the patient's patella. At this time, the two top plates (202) are respectively pressed on the upper end surfaces of the two lower supports (102) to prevent The two first clamping rods (201) are moved, and then a second clamping rod (204) is manually pushed and pulled according to the size of the patient's patella. The rack on the second clamping rod (204) drives the gear II (205) to rotate, thereby driving the other second clamping rod (204) to move inward or outward, so that the two second clamping rods (204) are clamped on the upper and lower sides of the patient's patella, thereby determining the center point of the patient's patella, and at this time the scale plate (302) displays the specific distance between the second clamping rod (204) and the center point of the patella; S2: manually determine the middle and upper third of the patella based on the distance between the second clamping rod (204) and the center point of the patella displayed on the scale plate (302), with the help of the scale on the scale plate (302), and then manually push the cross bar (301) away from the support frame (206) so that the cross bar (301) is accurately located at the middle and upper third of the patella, thereby determining the bone tunnel exit point; S3: manually pulling the sleeve rod (304) outward so that the round rod (308) is located at the edge of the outer wall of the patella to determine the entrance point of the bone tunnel; S4: manually pulling the round rod (308) downward, the round rod (308) drives the two marking pens (307) to move downward at the same time, so that the two marking pens (307) mark the entrance and exit of the bone tunnel on the patient's patella; S5: Manually remove the guide (4) from the slot frame (105), use the tip of the V-shaped slide bar (402) to correspond to the marked bone tunnel exit, and use the Kirschner wire (404) to correspond to the bone tunnel entrance to establish the bone tunnel.

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