Auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery

Abstract

The invention relates to the technical field of medical instruments, in particular to a temporomandibular joint prosthesis replacement surgery auxiliary positioning tool which comprises a first fixing guide plate and a second fixing guide plate, a guide groove is formed in the second fixing guide plate, an opening is formed in one side of the guide groove, and a saw blade can enter the guide groove through the opening. A first clamping block and a second clamping block are arranged on the second fixed guide plate in a sliding manner, and the first clamping block and the second clamping block can be close to each other in the guide groove, so that the saw blade is clamped in the thickness direction of the saw blade, and the position of the saw blade in the guide groove is positioned; the first clamping block and the second clamping block are each provided with a clamping roller in a rotating mode, the clamping rollers can rotate in the circumferential direction when the saw blade is inserted into the lesion condylar process head, the first clamping block and the second clamping block are further provided with limiting pieces, the limiting pieces can control the rotating angles of the clamping rollers, and therefore the depth of the saw blade inserted into the lesion condylar process head is controlled. Different insertion depths can be conveniently adjusted according to 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 the tissues around the joint. Temporomandibular arthroplasty is an effective method for treating temporomandibular joint ankylosis. By removing the bone with adhesions of the joint lesions and replacing the temporomandibular joint prosthesis, the movement and chewing function of the mandible can be restored.

[0003] Currently, during the process of temporomandibular joint prosthesis replacement surgery, it is necessary to fix a bracket on the patient's temporomandibular joint, and then use a reciprocating saw 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 easily leads to inaccurate control of the cutting depth and affects 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, it is necessary to provide an auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery.

[0005] The above object is achieved by the following technical solutions: An auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery includes a first fixing guide plate and a second fixing guide plate. The first fixing guide plate is attached to the outer side of the zygomatic arch, and the second fixing guide plate is attached to the outer side of the condyle. The first fixing guide plate and the second fixing guide plate are used for installing a temporomandibular joint prosthesis. A guiding groove is provided on the second fixing 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 fixing 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, and the limiting member can control the rotation angle of the clamping rollers, so as to control the depth of the saw blade inserted into the diseased condylar head.

[0006] 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. A first threaded section is provided on the limiting rod, 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.

[0007] Further, a rotating cylinder is sleeved on the moving ring, and the rotating cylinder is slidably matched with the moving ring through a key groove. 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 are slidably matched with the limiting rod through key grooves and are rotatably matched with the clamping roller.

[0008] 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.

[0009] Further, a plurality of guiding grooves are provided on the circumference of the clamping roller, and the guiding grooves extend along the axial direction of the clamping roller. First sliders are slidably arranged in the guiding grooves, and the first sliders move along with the swing of the saw blade.

[0010] Further, a first installation groove and a second installation groove are further provided 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.

[0011] 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.

[0012] Further, a first accommodation groove and a second accommodation groove are provided 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 provided 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.

[0013] 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 respectively provided with a second threaded section, and the second threaded section is 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.

[0014] Further, one end of the limiting rod is provided with a dial block, and by pulling the dial block, the limiting rod can be moved along its length direction. A nut is further 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.

[0015] The beneficial effects of the present invention are as follows: When the temporomandibular joint prosthesis replacement surgery auxiliary positioning tool 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.

[0016] 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

[0017] Figure 1 is a schematic diagram of the use state of the temporomandibular joint prosthesis replacement surgery auxiliary positioning tool provided by an embodiment of the present invention; Figure 2 is a front view of the temporomandibular joint prosthesis replacement surgery auxiliary positioning tool provided by an embodiment of the present invention; Figure 3 is a three-dimensional structure diagram of the temporomandibular joint prosthesis replacement surgery auxiliary positioning tool provided by an embodiment of the present invention; Figure 4 is an exploded view of the temporomandibular joint prosthesis replacement surgery auxiliary positioning tool provided by an embodiment of the present invention; Figure 5 is a front view of the first clamping block in the temporomandibular joint prosthesis replacement surgery auxiliary positioning tool provided by an embodiment of the present invention; Figure 6 is a side view of the first clamping block in the temporomandibular joint prosthesis replacement surgery auxiliary positioning tool provided by an embodiment of the present invention; Figure 7 isFigure 6 Cross-sectional view A-A in [the figure]; Figure 8 is Figure 7 Enlarged view of the structure at X in [the figure]; Figure 9 Exploded 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; Figure 10 Partial structural 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.

[0018] Wherein: 100, first fixed guide plate; 200, second fixed guide plate; 201, first installation groove; 202, first threaded hole; 203, fixing hole; 204, second threaded hole; 300, first locking screw; 301, second locking screw; 400, first clamping block; 410, clamping body; 411, second receiving groove; 412, third sliding groove; 413, second sliding groove; 420, limiting rod; 421, second threaded section; 422, first threaded section; 423, spline; 424, dial block; 430, nut; 440, third slider; 450, rotating cylinder; 460, moving ring; 470, transmission belt; 480, clamping roller; 481, guiding groove; 482, first slider; 490, support block; 491, second slider; 492, keyway; 493, spring; 494, hinge hole; 500, second clamping block; 600, saw blade; 700, guiding groove. Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, 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.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 thus should not be construed as limiting the present invention.

[0021] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean 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 may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0022] As Figures 1 to 10 shown, an auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery provided by an embodiment of the present invention includes a first fixing guide plate 100 and a second fixing guide plate 200. The first fixing guide plate 100 is attached to the outer side surface of the zygomatic arch, and the second fixing guide plate 200 is attached to the outer side surface of the condyle. The first fixing guide plate 100 and the second fixing guide plate 200 are used for installing a temporomandibular joint prosthesis. A guiding groove 700 is provided on the second fixing 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 fixing 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 along 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, so as to control the depth of the saw blade 600 inserted into the diseased condyle head.

[0023] The saw blade 600 is a saw blade on an orthopedic special saw, which belongs to the prior art. One end of the saw blade 600 makes a fan-shaped reciprocating swing around the other end (the swing direction is the axial direction of the clamping roller 480), so as to realize the cutting of the diseased condyle head. As Figure 4 shown, the first fixing guide plate 100 is fixed on the outer side surface of the zygomatic arch through a fixing hole 203, and the second fixing guide plate 200 is fixed on the outer side surface of the condyle through a fixing hole 203.

[0024] During use, the saw blade 600 can be aligned with the diseased position of the condylar head by adjusting the first clamping block 400 and the second clamping block 500, and the limiting member is adjusted according to the depth that the saw blade 600 needs to be inserted 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 be inserted, meeting the requirements of different insertion depths. In this way, there is no need for manual visual observation, improving the control accuracy of the insertion depth and ensuring the surgical effect.

[0025] In one embodiment, the limiting member is a limiting rod 420, and 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 threaded section 422 is provided on the limiting rod 420, and the first threaded section 422 has a spiral groove; a moving ring 460 is provided on the first threaded 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 further make the convex block of the moving ring 460 move 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 threaded section 422 is changed, thereby 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 threaded sections 422 on the limiting rods 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.

[0026] Further, a rotating cylinder 450 is sleeved on the moving ring 460, and the rotating cylinder 450 is slidably matched with the moving ring 460 through a key groove 492. The clamping roller 480 is connected and driven with the rotating cylinder 450 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. The support blocks 490 are slidably matched with the limiting rod 420 through key grooves 492. As Figure 9 and Figure 10 shown, key grooves 492 are provided on the support blocks 490, and splines 423 are provided on the limiting rod 420; the support blocks 490 are rotationally matched with the clamping roller 480. Hinge holes 494 are provided on the support blocks 490, and rotating shafts are provided on the clamping roller 480, and the rotating shafts are rotationally matched with the hinge holes 494. In this way, when the limiting rod 420 moves, the rotating cylinder 450, the support blocks 490, and the clamping roller 480 will not move therewith, avoiding affecting the clamping of the saw blade 600.

[0027] Further, there are three first thread segments 422 provided on the limiting rod 420. The three first thread segments 422 are distributed along the length direction of the limiting rod 420. There are three clamping rollers 480 provided, and the first thread segments 422 correspond to the clamping rollers 480 one by one. By providing a plurality of clamping rollers 480, it is possible to prevent the saw blade 600 from disengaging during the reciprocating swing. Specifically, 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 simultaneously during the swinging process.

[0028] Further, as Figure 8 shown, a plurality of guiding grooves 481 are provided on the circumferential direction of the clamping roller 480. The guiding grooves 481 extend along the axial direction of the clamping roller 480. A first slider 482 is slidably provided in the guiding grooves 481. The first slider 482 moves along 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 respectively 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.

[0029] Further, a first installation groove 201 and a second installation groove are also provided on the second fixed guide plate. Both the first installation groove 201 and the second installation groove communicate 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.

[0030] Further, the first clamping block 400 is positioned in the first installation groove 201 by a first locking screw 300, and the second clamping block 500 is positioned in the second installation groove by a 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. First threaded holes 202 corresponding to the first clamping block 400 and second threaded holes 204 corresponding to the second clamping block 500 are respectively provided on the second fixed guide plate 200. The first locking screw 300 is rotatably provided in the first threaded hole 202, and the second locking screw 301 is rotatably provided in the second threaded hole 204. By rotating the first locking screw 300 and the second locking screw 301 respectively, the positioning of the first clamping block 400 and the second clamping block 500 can be realized.

[0031] Further, the first clamping block 400 and the second clamping block 500 are both provided with a first receiving groove and two second receiving grooves 411. There are two second receiving grooves 411. The first receiving groove and the two second receiving grooves are distributed along the length direction of the limiting rod 420, and the first receiving groove is located between the two second receiving grooves 411. The support block 490 is located in the first receiving groove, and the two ends of the limiting rod 420 are respectively located in the second receiving grooves 411. A spring 493 is provided between the support block 490 and the bottom of the first receiving groove. The spring 493 has a tendency to make the clamping roller 480 approach the saw blade 600. Arranging 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.

[0032] Further, the side wall of the first receiving 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 receiving groove and the second receiving grooves 411. The two ends of the limiting rod 420 are respectively provided with second threaded sections 421. The second threaded sections 421 are located in the second receiving grooves 411. A third sliding block 440 is sleeved on the second threaded sections 421. The third sliding block 440 slides up and down along the third sliding groove 412.

[0033] 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 also 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 receiving groove.

[0034] 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 having an axial displacement.

[0035] Combined with the above embodiments, the working principle and process of the embodiments of the present invention are as follows: During use, for patients of different types, first fixing guides 100 and second fixing guides 200 of different sizes are customized, and the depth at which the saw blade 600 is inserted 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 patient's zygomatic arch and the outer side of the condyle. The first clamping block 400 and the second clamping block 500 are respectively installed in 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 greater the moving distance of the limit rod 420 is; conversely, if the required insertion depth is greater, the smaller the moving distance of the limit rod 420 is.

[0036] Take, for example, Figure 9 the case where the limit rod 420 moves to the right. When the limit rod 420 moves to the right, the moving ring 460 moves 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 rollers 480 of the first clamping block 400 and the second clamping block 500 rotate synchronously in opposite directions. 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, so that the moving ring 460 gradually moves 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, thus 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.

[0037] Finally, the saw blade 600 is withdrawn from between the first clamping block 400 and the second clamping block 500, and the first clamping block 400 and the second clamping block 500 are detached from the second fixing guide 200. The first clamping block 400 and the second clamping block 500 can be reused after disinfection. Then, the temporomandibular joint prosthesis is fixed on the first fixing guide 100 and the second fixing guide 200 to complete the operation.

[0038] 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.

[0039] 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 on 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 should be subject to the appended claims.

Claims

1. An auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery, 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 the 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 along 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 condyle head. A limiting member is also provided on the first clamping block and the second clamping block, and the limiting member can control the rotation angle of the clamping rollers, so as to control 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. A first threaded section is provided on the limiting rod, and the first threaded section has a spiral groove. A moving ring is provided 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. 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.

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 moving ring, and the rotating cylinder is slidably matched with the moving ring through a key groove. 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 are slidably matched with the limiting rod through key grooves and 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 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.

5. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 3, characterized in that, A plurality of guiding grooves are provided on the circumference of the clamping roller, and the guiding grooves extend along the axial direction of the clamping roller. A first slider is slidably arranged in the guiding grooves, and the first slider moves as the saw blade swings.

6. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 3, characterized in that, A first installation groove and a second installation groove are also provided 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.

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

8. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 6, characterized in that, First accommodation grooves and second accommodation grooves are provided 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 two ends of the limiting rod are respectively located in the second accommodation grooves. A spring is provided 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.

9. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 8, characterized in that, The side wall of the first receiving groove is provided with a second sliding groove, the support block is provided with a second sliding 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 respectively provided with a second threaded section, and the second threaded section is 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.

10. The auxiliary positioning tool for temporomandibular joint prosthesis replacement surgery according to claim 9, characterized in that, One end of the limiting rod is provided with a dial block, and by pulling the dial block, the limiting rod can be moved along its length direction. A nut is further 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.

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