An auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery

Abstract

The present invention relates to the technical field of medical devices, and particularly relates to an auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery, which includes a first fixed guide plate and a second fixed guide plate. A guiding groove is provided on the second fixed guide plate, and one side of the guiding groove has an opening through which a saw blade enters the guiding groove. A first clamping block and a second clamping block are slidably provided on the second fixed guide plate. The first clamping block and the second clamping block can approach each other in the guiding groove, so as to clamp the saw blade in the thickness direction of the saw blade and position the saw blade in the guiding groove. Clamping rollers are rotatably provided on both the first clamping block and the second clamping block. The clamping rollers can rotate circumferentially as the saw blade is inserted into the diseased condylar head. A limiting member is also provided on the first clamping block and the second clamping block. The limiting member can control the rotation angle of the clamping rollers, so as to control the insertion depth of the saw blade into the diseased condylar head, facilitating adjustment of different insertion depths for different patients.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery. Background Art

[0002] Temporomandibular joint ankylosis refers to the difficulty or complete inability to open the mouth caused by organic lesions of the joint and surrounding tissues. Temporomandibular joint arthroplasty is an effective method for treating temporomandibular joint ankylosis. By removing the bone with joint pathological adhesions and replacing the temporomandibular joint prosthesis, the movement and chewing function of the mandible can be restored.

[0003] Currently, during the temporomandibular joint prosthesis replacement surgery, a fixed bracket needs to be fixed on the patient's temporomandibular joint, and then a reciprocating saw is used to remove the diseased condylar head. However, due to different factors such as the cutting position and the patient's age, the sizes of the diseased condylar head parts are different, and different cutting depths are often required. Currently, only relying on the naked eye of the operator to control the cutting depth is likely to result in inaccurate control of the cutting depth, affecting the surgical effect. Summary of the Invention

[0004] Based on this, in view of the technical problem that currently relying on the naked eye of the operator to control the cutting depth of the reciprocating saw affects the surgical effect, an auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery is provided.

[0005] The above object is achieved by the following technical solutions:

[0006] An auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery includes a first fixed guide plate and a second fixed guide plate. The first fixed guide plate is attached to the outer surface of the zygomatic arch, and the second fixed guide plate is attached to the outer surface of the condyle. The first fixed guide plate and the second fixed guide plate are used for installing a temporomandibular joint prosthesis. A guiding groove is provided on the second fixed guide plate, and one side of the guiding groove has an opening for a saw blade to enter the guiding groove. A first clamping block and a second clamping block are slidably provided on the second fixed guide plate. The first clamping block and the second clamping block can approach each other in the guiding groove, so as to clamp the saw blade in the thickness direction of the saw blade and position the position of the saw blade in the guiding groove. Clamping rollers are rotatably provided on both the first clamping block and the second clamping block. The clamping rollers can rotate circumferentially as the saw blade is inserted into the diseased condylar head. Limit members are also provided on the first clamping block and the second clamping block, and the limit members can control the rotation angle of the clamping rollers, thereby controlling the depth of insertion of the saw blade into the diseased condylar head.

[0007] Further, the limiting member is a limiting rod, which is slidably arranged on the first clamping block or the second clamping block along its length direction. The limiting rod is provided with a first threaded section, and the first threaded section has a spiral groove; a moving ring is arranged on the first threaded section, and the moving ring has a convex block, and the convex block can move along the spiral groove; the limiting rod can move along its length direction to adjust the initial position of the convex block in the spiral groove, and the rotation of the clamping roller can drive the moving ring to rotate synchronously, so that the convex block of the moving ring moves along the spiral groove. When the convex block moves to the end of the first spiral groove, the clamping roller stops rotating.

[0008] Further, a rotating cylinder is sleeved on the moving ring, and the rotating cylinder and the moving ring are slidably matched through a keyway. The clamping roller is connected and driven with the rotating cylinder through a transmission belt. Support blocks are respectively arranged between the two axial ends of the clamping roller and the limiting rod. The support blocks and the limiting rod are slidably matched through a keyway, and the support blocks and the clamping roller are rotationally matched.

[0009] Further, there are three first threaded sections, and the three first threaded sections are distributed along the length direction of the limiting rod. There are three clamping rollers, and the first threaded sections correspond to the clamping rollers one by one.

[0010] Further, a plurality of guiding grooves are arranged on the circumference of the clamping roller, the guiding grooves extend along the axial direction of the clamping roller, and a first slider is slidably arranged in the guiding grooves. The first slider moves with the swing of the saw blade.

[0011] Further, a first installation groove and a second installation groove are further arranged on the second fixed guide plate. The first installation groove and the second installation groove are both communicated with the guiding groove; the first clamping block is slidably arranged in the first installation groove, and the second clamping block is slidably arranged in the second installation groove.

[0012] Further, the first clamping block is positioned in the first installation groove through a locking screw, and the second clamping block is positioned in the second installation groove through a locking screw.

[0013] Further, a first accommodation groove and a second accommodation groove are arranged on both the first clamping block and the second clamping block. There are two second accommodation grooves. The first accommodation groove and the two second accommodation grooves are distributed along the length direction of the limiting rod, and the first accommodation groove is located between the two second accommodation grooves. The support block is located in the first accommodation groove, and the left and right ends of the limiting rod are respectively located in the second accommodation grooves; a spring is arranged between the support block and the bottom of the first accommodation groove, and the spring has a tendency to make the clamping roller approach the saw blade.

[0014] Further, a second sliding groove is provided on the side wall of the first receiving groove, a second sliding block is provided on the support block, and the second sliding block slides up and down along the second sliding groove. A third sliding groove is provided between the first receiving groove and the second receiving groove. Both ends of the limiting rod are provided with second threaded sections, and the second threaded sections are located in the second receiving groove. A third sliding block is sleeved on the second threaded section, and the third sliding block slides up and down along the third sliding groove.

[0015] Further, one end of the limiting rod is provided with a dialing block, and the limiting rod can be moved along its length direction by pulling the dialing block. A nut is also provided on the second threaded section, and the nut is located on the side of the third sliding block away from the first receiving groove.

[0016] The beneficial effects of the present invention are as follows:

[0017] When the auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by the present invention is in use, by adjusting the first clamping block and the second clamping block, the saw blade can be aligned with the diseased position of the condylar head, and the limiting member is adjusted in advance according to the depth that the saw blade needs to insert into the diseased condylar head. After the saw blade is inserted into the set depth of the diseased condylar head, the limiting member controls the clamping roller to stop rotating, so that the saw blade no longer continues to insert. In this way, there is no need for manual visual observation, the control accuracy of the insertion depth is improved, and the surgical effect is guaranteed. At the same time, it can meet the different insertion depth requirements of different patients and improve the versatility.

[0018] Secondly, a first sliding block is provided on the clamping roller, and the first sliding block moves with the swing of the saw blade, which can reduce the relative sliding between the saw blade and the sliding block, make the reciprocating swing of the saw blade smoother, and reduce the vibration of the saw blade. Description of the Drawings

[0019] Figure 1 Schematic diagram of the use state of the auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of the present invention;

[0020] Figure 2 Front view of the auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the three-dimensional structure of the auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of the present invention;

[0022] Figure 4 Explosion diagram of the auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of the present invention;

[0023] Figure 5 Front view of the first clamping block in the auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of the present invention;

[0024] Figure 6 Side view of the first clamping block in the auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of the present invention;

[0025] Figure 7 is Figure 6 A - A cross - sectional view in;

[0026] Figure 8 is Figure 7 Enlarged view of the structure at X in;

[0027] Figure 9 Explosion schematic diagram of the first clamping block in the auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of the present invention;

[0028] Figure 10 Partial structure schematic diagram of the first clamping block in the auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of the present invention.

[0029] Where:

[0030] 100, the first fixed guide plate; 200, the second fixed guide plate; 201, the first installation groove; 202, the first threaded hole; 203, the fixing hole; 204, the second threaded hole; 300, the first locking screw; 301, the second locking screw; 400, the first clamping block; 410, the clamping body; 411, the second receiving groove; 412, the third sliding groove; 413, the second sliding groove; 420, the limiting rod; 421, the second threaded section; 422, the first threaded section; 423, the spline; 424, the dialing block; 430, the nut; 440, the third slider; 450, the rotating cylinder; 460, the moving ring; 470, the transmission belt; 480, the clamping roller; 481, the guiding groove; 482, the first slider; 490, the support block; 491, the second slider; 492, the keyway; 493, the spring; 494, the hinge hole; 500, the second clamping block; 600, the saw blade; 700, the guiding groove. Detailed implementation manners

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The serial numbers assigned to components in this text, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "coupling" as used in this invention, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention.

[0033] In this invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0034] As Figures 1 to 10 shown, an auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of this invention includes a first fixed guide plate 100 and a second fixed guide plate 200. The first fixed guide plate 100 is attached to the outer side of the zygomatic arch, and the second fixed guide plate 200 is attached to the outer side of the condyle. The first fixed guide plate 100 and the second fixed guide plate 200 are used for installing a temporomandibular joint prosthesis. A guiding groove 700 is provided on the second fixed guide plate 200, and one side of the guiding groove 700 has an opening for a saw blade 600 to enter the guiding groove 700. A first clamping block 400 and a second clamping block 500 are slidably provided on the second fixed guide plate 200. The first clamping block 400 and the second clamping block 500 can approach each other in the guiding groove 700 so as to clamp the saw blade 600 in the thickness direction of the saw blade 600 and position the saw blade 600 in the guiding groove 700. Clamping rollers 480 are rotatably provided on both the first clamping block 400 and the second clamping block 500. The clamping rollers 480 can rotate circumferentially as the saw blade 600 is inserted into the diseased condyle head. Limit members are also provided on the first clamping block 400 and the second clamping block 500, and the limit members can control the rotation angle of the clamping rollers 480, thereby controlling the depth of insertion of the saw blade 600 into the diseased condyle head.

[0035] The saw blade 600 is a saw blade for an orthopedic special saw and belongs to the prior art. One end of the saw blade 600 swings back and forth in a fan shape around the other end (the swinging direction is the axial direction of the clamping roller 480), so as to cut the diseased condylar head. As Figure 4 shown, the first fixed guide plate 100 is fixed on the outer side of the zygomatic arch through the fixing hole 203, and the second fixed guide plate 200 is fixed on the outer side of the condyle through the fixing hole 203.

[0036] In use, by adjusting the first clamping block 400 and the second clamping block 500, the saw blade 600 can be aligned with the diseased position of the condylar head, and the limiting member is adjusted according to the depth that the saw blade 600 needs to insert into the diseased condylar head. After the saw blade 600 is inserted into the set depth of the diseased condylar head, the limiting member controls the clamping roller 480 to stop rotating, so that the saw blade 600 no longer continues to insert, meeting the requirements of different insertion depths. In this way, there is no need for manual visual observation, the control accuracy of the insertion depth is improved, and the surgical effect is guaranteed.

[0037] In an embodiment, the limiting member is a limiting rod 420. The limiting rod 420 is slidably arranged on the first clamping block 400 or the second clamping block 500 along its length direction. A first thread section 422 is provided on the limiting rod 420, and the first thread section 422 has a spiral groove; a moving ring 460 is provided on the first thread section 422, and the moving ring 460 has a convex block, and the convex block can move along the spiral groove; the limiting rod 420 can move along its length direction to adjust the initial position of the convex block in the spiral groove. The rotation of the clamping roller 480 can drive the moving ring 460 to rotate synchronously, and then the convex block of the moving ring 460 moves along the spiral groove. When the convex block moves to the end of the spiral groove, the clamping roller 480 stops rotating. In this way, by moving the limiting rod 420 in the length direction, the initial position of the convex block in the spiral groove is controlled, so that the maximum distance that the convex block can move on the first thread section 422 is changed, and then the number of turns that the moving ring 460 can rotate is changed, and further the number of turns of the rotation of the clamping roller 480 is controlled, realizing the control of the rotation angle of the clamping roller 480. The operation is convenient and it is easy to adjust different insertion depths. The helix directions of the first thread sections 422 on the limiting rod 420 in the first clamping block 400 and the second clamping block 500 are opposite, and the clamping rollers 480 in the first clamping block 400 and the second clamping block 500 rotate synchronously and in opposite directions.

[0038] Furthermore, a rotating cylinder 450 is sleeved on the moving ring 460, and the rotating cylinder 450 and the moving ring 460 are in sliding fit through a keyway 492. The clamping roller 480 and the rotating cylinder 450 are connected and driven through a transmission belt 470. Support blocks 490 are respectively arranged between the axial two ends of the clamping roller 480 and the limiting rod 420, and the support blocks 490 and the limiting rod 420 are in sliding fit through a keyway 492. As Figure 9 andFigure 10 As shown, a keyway 492 is provided on the support block 490, and a spline 423 is provided on the limiting rod 420; the support block 490 is rotationally engaged with the clamping roller 480. An articulated hole 494 is provided on the support block 490, and a rotating shaft is provided on the clamping roller 480, and the rotating shaft is rotationally engaged with the articulated hole 494. In this way, when the limiting rod 420 moves, the rotating cylinder 450, the support block 490, and the clamping roller 480 will not move therewith, avoiding affecting the clamping of the saw blade 600.

[0039] Furthermore, there are three first thread segments 422, and the three first thread segments 422 are distributed along the length direction of the limiting rod 420. There are three clamping rollers 480, and the first thread segments 422 correspond to the clamping rollers 480 one by one. By providing multiple clamping rollers 480, it is possible to prevent the saw blade 600 from disengaging during the reciprocating swing. Specifically, when setting, the length of the clamping roller 480 is less than half of the width of the saw blade 600, so as to ensure that the saw blade 600 can always be clamped by two clamping rollers 480 during the swinging process.

[0040] Furthermore, as Figure 8 shown, a plurality of guide grooves 481 are provided on the circumference of the clamping roller 480. The guide grooves 481 extend along the axial direction of the clamping roller 480. A first slider 482 is slidably provided in the guide grooves 481. The first slider 482 moves with the swing of the saw blade 600, which can reduce the relative sliding between the saw blade 600 and the slider, make the reciprocating swing of the saw blade 600 smoother, and reduce the vibration of the saw blade 600. Chamfers are provided on both sides of the first slider 482 along the axial direction of the clamping roller 480, and the chamfers can reduce the sliding friction resistance.

[0041] Furthermore, a first installation groove 201 and a second installation groove are further provided on the second fixed guide plate. The first installation groove 201 and the second installation groove are both communicated with the guiding groove 700; the first clamping block 400 is slidably provided in the first installation groove 201, and the second clamping block 500 is slidably provided in the second installation groove.

[0042] Further, the first clamping block 400 is positioned in the first installation groove 201 by the first locking screw 300, and the second clamping block 500 is positioned in the second installation groove by the second locking screw 301. Both the first clamping block 400 and the second clamping block 500 have a clamping body 410. The clamping body 410 slides along the first installation groove 201 or the second installation groove. The second fixed guide plate 200 is respectively provided with a first threaded hole 202 corresponding to the first clamping block 400 and a second threaded hole 204 corresponding to the second clamping block 500. The first locking screw 300 is rotatably arranged in the first threaded hole 202, and the second locking screw 301 is rotatably arranged in the second threaded hole 204. The positioning of the first clamping block 400 and the second clamping block 500 is respectively achieved by rotating the first locking screw 300 and the second locking screw 301.

[0043] Further, both the first clamping block 400 and the second clamping block 500 are provided with a first accommodation groove and two second accommodation grooves 411. There are two second accommodation grooves 411. The first accommodation groove and the two second accommodation grooves are distributed along the length direction of the limiting rod 420, and the first accommodation groove is located between the two second accommodation grooves 411. The support block 490 is located in the first accommodation groove, and both ends of the limiting rod 420 are respectively located in the second accommodation grooves 411; a spring 493 is provided between the support block 490 and the bottom of the first accommodation groove. The spring 493 has a tendency to make the clamping roller 480 approach the saw blade 600. The arrangement of the spring 493 can provide an elastic force to the clamping roller 480, so that the clamping roller 480 maintains a state of clamping the saw blade 600.

[0044] Further, the side wall of the first accommodation groove is provided with a second sliding groove 413, and the support block 490 is provided with a second sliding block 491. The second sliding block 491 slides up and down along the second sliding groove 413. A third sliding groove 412 is provided between the first accommodation groove and the second accommodation grooves 411. Both ends of the limiting rod 420 are respectively provided with a second threaded section 421. The second threaded section 421 is located in the second accommodation grooves 411. A third sliding block 440 is sleeved on the second threaded section 421. The third sliding block 440 slides up and down along the third sliding groove 412.

[0045] Further, one end of the limiting rod 420 is provided with a dial block 424. By pulling the dial block 424, the limiting rod 420 can be moved along its length direction. A nut 430 is further provided on the second threaded section 421. The nut 430 is located on the side of the third sliding block 440 away from the first accommodation groove.

[0046] After the limiting rod 420 is moved in place, by rotating the nuts 430 at both ends of the limiting rod 420, the two nuts 430 are respectively brought into contact with the third sliding block 440, so as to lock the position of the limiting rod 420 and prevent the limiting rod 420 from undergoing axial displacement.

[0047] Combined with the above embodiments, the usage principle and working process of the embodiments of the present invention are as follows:

[0048] During use, for different types of patients, first fixing guides 100 and second fixing guides 200 of different sizes are customized, and the depth of insertion of the saw blade 600 into the diseased condylar head is determined. Then, the first fixing guide 100 and the second fixing guide 200 are respectively fixedly installed on the outer side of the zygomatic arch and the outer side of the condyle of the patient. The first clamping block 400 and the second clamping block 500 are respectively installed into the first installation groove 201 and the second installation groove of the second fixing guide, so that the positions between the first clamping block 400 and the second clamping block 500 correspond to the diseased condylar head. Then, according to the determined depth of insertion into the diseased condylar head, the shifting blocks 424 in the first clamping block 400 and the second clamping block 500 are respectively pulled. If the required insertion depth is smaller, the moving distance of the limiting rod 420 is larger; conversely, if the required insertion depth is larger, the moving distance of the limiting rod 420 is smaller.

[0049] Take Figure 9 For example, when the limiting rod 420 moves to the right, the limiting rod 420 moves to the right, causing the moving ring 460 to move leftward along the spiral groove of the first threaded section 422. At the same time, the rotation of the moving ring 460 drives the rotating cylinder 450 to rotate, and the rotation of the rotating cylinder 450 drives the clamping roller 480 to rotate. Since the saw blade 600 is not inserted between the first clamping block 400 and the second clamping block 500 at this time, the rotation of the clamping roller 480 will not affect the saw blade 600. Since the convex block of the moving ring 460 moves leftward along the spiral groove of the first threaded section 422, the distance between the initial position of the convex block in the spiral groove of the first threaded section 422 and the leftmost end of the first threaded section 422 is shortened. After the saw blade 600 is inserted between the clamping roller 480 of the first clamping block 400 and the clamping roller 480 of the second clamping block 500, as the saw blade 600 is inserted, under the action of friction, the clamping roller 480 of the first clamping block 400 and the clamping roller 480 of the second clamping block 500 rotate synchronously in the opposite direction. The rotation of the clamping roller 480 drives the rotating cylinder 450 to rotate through the transmission belt 470, and the rotating cylinder 450 drives the moving ring 460 to rotate, causing the moving ring 460 to gradually move from the initial position to the leftmost end of the first threaded section 422. Subsequently, the moving ring 460 no longer moves and rotates, making the rotating cylinder 450 and the clamping roller 480 unable to rotate, and the saw blade 600 unable to continue to be inserted, realizing the control of the insertion depth of the saw blade 600. This process can remind medical staff that the cutting depth has been reached and complete the cutting of the quantitative depth.

[0050] Finally, withdraw the saw blade 600 from between the first clamping block 400 and the second clamping block 500, and detach the first clamping block 400 and the second clamping block 500 from the second fixed guide plate 200. The first clamping block 400 and the second clamping block 500 can be reused after disinfection. Then, fix the temporomandibular joint prosthesis on the first fixed guide plate 100 and the second fixed guide plate 200 to complete the operation.

[0051] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0052] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A temporomandibular joint prosthesis replacement surgery auxiliary positioning tool, characterized in that: It includes a first fixed guide plate and a second fixed guide plate, the first fixed guide plate is attached to the outer side of the zygomatic arch, and the second fixed guide plate is attached to the outer side of the condyle; the first fixed guide plate and the second fixed guide plate are used to install a temporomandibular joint prosthesis; the second fixed guide plate is provided with a guide groove, and one side of the guide groove has an opening, and the opening is for the saw blade to enter the guide groove, and the second fixed guide plate is slidingly provided with a first clamping block and a second clamping block, the first clamping block and the second clamping block can approach each other in the guide groove, thereby clamping the saw blade along the thickness direction of the saw blade and positioning the position of the saw blade in the guide groove; the first clamping block and the second clamping block are both rotatably provided with a clamping roller, and the clamping roller can rotate circumferentially as the saw blade is inserted into the diseased condyle head, and the first clamping block and the second clamping block are also provided with a limit member, and the limit member can control the rotation angle of the clamping roller, thereby controlling the depth of the saw blade inserted into the diseased condyle head.

2. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 1, characterized in that: The limiting member is a limiting rod, which is slidably arranged on the first clamping block or the second clamping block along its length direction. The limiting rod is provided with a first threaded section, and the first threaded section has a spiral groove; the first threaded section is provided with a moving ring, and the moving ring has a protrusion, and the protrusion can move along the spiral groove; the limiting rod can adjust the initial position of the protrusion in the spiral groove by moving along its length direction, and the rotation of the clamping roller can drive the moving ring to rotate synchronously, thereby making the protrusion of the moving ring move along the spiral groove, and the clamping roller stops rotating when the protrusion moves to the end of the first spiral groove.

3. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 2, characterized in that: A rotating cylinder is sleeved on the movable ring, and the rotating cylinder and the movable ring are slidably matched through a keyway. The clamping roller and the rotating cylinder are connected and transmitted through a transmission belt. Support blocks are respectively provided between the axial ends of the clamping roller and the limit rod. The support blocks and the limit rod are slidably matched through a keyway, and the support blocks are rotatably matched with the clamping roller.

4. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 2 or 3, characterized in that: There are three first thread segments, which are distributed along the length direction of the limiting rod. There are three clamping rollers, and the first thread segments correspond to the clamping rollers one by one.

5. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 3, characterized in that: A plurality of guide grooves are provided on the circumference of the clamping roller, and the guide grooves extend along the axial direction of the clamping roller. A first sliding block is slidably provided in the guide groove, and the first sliding block moves with the swing of the saw blade.

6. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 3, characterized in that: The second fixed guide plate is further provided with a first mounting groove and a second mounting groove, both of which are connected to the guide groove; the first clamping block is slidably arranged in the first mounting groove, and the second clamping block is slidably arranged in the second mounting groove.

7. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 6, characterized in that: The first clamping block is positioned in the first mounting groove by a first locking screw, and the second clamping block is positioned in the second mounting groove by a second locking screw.

8. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 6, characterized in that: The first clamping block and the second clamping block are both provided with a first accommodating groove and a second accommodating groove, and two second accommodating grooves are provided. The first accommodating groove and the two second accommodating grooves are distributed along the length direction of the limiting rod, and the first accommodating groove is located between the two second accommodating grooves. The supporting block is located in the first accommodating groove, and both ends of the limiting rod are respectively located in the second accommodating grooves; A spring is provided between the support block and the bottom of the first accommodating groove, and the spring has a tendency to make the clamping roller close to the saw blade.

9. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 8, characterized in that: A second sliding groove is provided on the side wall of the first accommodating groove, a second slider is provided on the support block, the second slider slides up and down along the second sliding groove, a third sliding groove is provided between the first accommodating groove and the second accommodating groove, second thread sections are respectively provided at both ends of the limiting rod, the second thread section is located in the second accommodating groove, a third slider is sleeved on the second thread section, and the third slider slides up and down along the third sliding groove.

10. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 9, characterized in that: A shift block is provided at one end of the limiting rod, and the limiting rod can be moved along its length direction by pulling the shift block. A nut is also provided on the second threaded section, and the nut is located on the side of the third slider away from the first accommodating groove.

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