Medial patellar ligament reconstruction with patellar tunnel locator

Abstract

The utility model discloses a kind of patellar tunnel positioners for patellar medial ligament reconstruction, comprising: mounting bracket, two groups of fixed installers of relative interval fixed in the both ends of mounting bracket, movable installer slidingly connected on mounting bracket, two first guide sleeves and a second guide sleeve for positioning and guiding bone drill driving in. Two first guide sleeves are used to be respectively detachably fixed on two groups of fixed installers, to be relatively tightly on the both sides of patella, and then guide the bone drill loaded in it to drill out first transverse patellar tunnel on patella. Second guide sleeve is used to be detachably fixed on movable installer, to be parallelly fixed on the first guide sleeve of fixed installer, and then guide the bone drill loaded in it to drill out second transverse patellar tunnel parallel to first transverse patellar tunnel on patella. The new type positioner can establish transverse double tunnel on patella to meet the requirement of operation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular, to a patellar tunnel locator for patellar medial ligament reconstruction. Background Technology

[0002] Patellar dislocation is a common type of knee injury, frequently occurring in adolescents, especially women. The medial patellofemoral ligament (MTL) is the most important tissue in the medial support system of the patella, consisting of a superior oblique bundle and a inferior straight bundle. Patellar dislocation is often accompanied by MTL injury. Medial patellofemoral ligament reconstruction is a commonly used surgical procedure for treating patellar dislocation both domestically and internationally. It involves drilling a bone tunnel in the patella to fix the medial patellofemoral ligament and prevent recurrent patellar dislocation.

[0003] In current techniques, surgeons typically locate the patellar tunnel by palpation or under fluoroscopy. Both of these methods are prone to misalignment of the patellar tunnel, affecting surgical outcomes and increasing the risk of patellar fracture.

[0004] Existing patents, such as Figure 1 As shown, CN108618850A discloses a positioning device for establishing a patellar curved tunnel surgery, which includes an arc-shaped positioning device body 11 and a handle 12. The arc-shaped positioning device body 11 and the handle 12 are fixedly connected as an integral structure by a nut. The arc-shaped positioning device body 11 is provided with a slide groove 111 for adjusting the angle in the middle. The central locator 13 is installed in the slide groove 111 by a screw fixer 14. The arc-shaped positioning device body 11 is provided with an inner locator 15 and an outer locator 16 on both ends. The central locator 13 and the inner locator 15 are provided with a hollow central inner sleeve 131 and an inner inner sleeve 151, which allows Kirschner wires with smaller inner diameters to be smoothly inserted into the patella through the central inner sleeve 131 and the inner inner sleeve 151.

[0005] But if Figure 2 As shown, a commonly used patellar tunnel fixation method involves using a transverse double tunnel on the patella for fixation (e.g., Figure 2 (As shown in A). However, in the aforementioned existing patented device, because the arc-shaped positioning device body 11 is arc-shaped, and the central locator 13 and the inner locator 15 intersect at an angle, it can only create a double-bend tunnel (i.e., a V-shaped tunnel, such as...). Figure 2 (As shown in C), it is impossible to establish a transverse double tunnel; in addition, when it is necessary to adjust the circumferential angle of the central locator 13, it is necessary to simultaneously loosen and tighten the spiral retainers 14 on both sides of the central locator 13, which makes the adjustment operation very inconvenient. Utility Model Content

[0006] This invention provides a patellar tunnel locator for medial patellar ligament reconstruction, which solves the technical problem that existing devices cannot establish transverse double tunnels.

[0007] The technical solution adopted in this utility model is as follows:

[0008] A patellar tunnel locator for medial patellar ligament reconstruction includes: a mounting frame, two sets of fixed mounts fixed at opposite intervals at both ends of the mounting frame, a movable mount slidably connected to the mounting frame, two first guide sleeves and one second guide sleeve for positioning and guiding the insertion of a bone drill; the two first guide sleeves are detachably fixed to the two sets of fixed mounts respectively, so as to press against the two sides of the human patella, thereby guiding the bone drill inserted therein to drill a first transverse patellar tunnel in the patella; the second guide sleeve is detachably fixed to the movable mount, so as to be parallel to the first guide sleeve fixed to the fixed mount, thereby guiding the bone drill inserted therein to drill a second transverse patellar tunnel in the patella parallel to the first transverse patellar tunnel.

[0009] Furthermore, the mounting frame is U-shaped, with its two ends used to fix it to the medial and lateral sides of the patient's patella, respectively. The mounting frame also has a U-shaped channel that extends and runs through it along its length. Two sets of fixed mounts are fixedly installed at both ends of the opening of the mounting frame. The movable mount is slidably installed in the U-shaped channel.

[0010] Furthermore, the fixing device includes a fixing sleeve and abutting screw that cooperate with each other; the fixing sleeve is fixed to the first side of the mounting bracket, and a first through hole is provided vertically through the outer wall of the fixing sleeve; the abutting screw is threaded into the mounting bracket from the second side of the mounting bracket, and the screw of the abutting screw passes through the mounting bracket and abuts against the first guide sleeve installed in the first through hole, so that the first guide sleeve is fixed in the first through hole.

[0011] Furthermore, the fixing sleeve is a hollow cylindrical shape with one end closed and the other end open, and the open end of the fixing sleeve is fixed to the first side of the mounting bracket; the mounting bracket has a first threaded hole that is processed through the fixing sleeve to connect the inner cavity of the fixing sleeve, and the abutting screw is inserted into the first threaded hole from the second side of the mounting bracket.

[0012] Furthermore, the movable installer includes a movable sleeve and a pull screw that cooperate with each other; the movable sleeve is inserted into the U-shaped channel from the first side of the mounting bracket, and a second through hole is provided vertically through the outer wall of the movable sleeve; the pull screw extends into the U-shaped channel from the second side of the mounting bracket and is threaded onto the movable sleeve.

[0013] Furthermore, the movable sleeve includes a hollow cylindrical sleeve body and a connecting post connected to the open end of the sleeve body. The connecting post has a second threaded hole that extends through it along its axial direction. The lifting screw includes a screw head and a screw rod connected along its axial direction. The screw rod extends from the second side of the mounting bracket into the U-shaped channel and is threaded into the second threaded hole.

[0014] Furthermore, a limiting step is formed at the connection between the connecting column and the sleeve body; each of the two opposite side walls of the U-shaped channel is provided with a U-shaped flange protruding towards the center and in a U-shape. The U-shaped flange is used to abut against the limiting step to limit the depth of the movable sleeve entering the U-shaped channel.

[0015] Furthermore, two opposing rotation-limiting steps are machined on the outer wall of the sleeve body near the connecting column; each of the two side walls at both ends of the U-shaped channel is provided with a rotation-limiting flange protruding towards the center. The rotation-limiting flange is used to cooperate with the corresponding rotation-limiting step to limit the rotation of the movable sleeve under force.

[0016] Furthermore, the second guide sleeve includes a guide sleeve and a guide cone connected sequentially along the axial direction. The guide cone gradually retracts inward along the direction of the bone drill insertion to enhance the limiting of the bone drill.

[0017] This utility model has the following beneficial effects:

[0018] When using the locator of this invention to establish a patellar tunnel, compared with manual palpation or fluoroscopic positioning, its positioning accuracy is high, and it is less prone to deviations in the position and direction of the patellar tunnel, thereby improving surgical outcomes and reducing the risk of patellar fracture. Compared with existing positioning devices, in the locator of this invention, when the movable installer is positioned close to the fixed installer, the second guide sleeve mounted on the movable installer can be parallel to the first guide sleeve mounted on the fixed installer, thereby establishing a transverse double tunnel on the patella to meet surgical requirements.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the spatial structure of an existing positioning device;

[0022] Figure 2 This is a schematic diagram of a commonly used patellar tunnel fixation method;

[0023] Figure 3 This is a schematic diagram of the spatial structure of a patellar tunnel locator for medial patellar ligament reconstruction according to a preferred embodiment of the present invention.

[0024] Figure 4 yes Figure 3 Schematic diagram of the spatial structure of the movable sleeve;

[0025] Figure 5 yes Figure 3 Schematic diagram of the spatial structure of the second guide sleeve;

[0026] Figure 6 yes Figure 3 A schematic diagram of the spatial structure of the central lifting screw.

[0027] Legend:

[0028] 11. Arc-shaped positioning device body; 111. Slide groove; 12. Handle; 13. Central positioner; 131. Central inner sleeve; 14. Spiral retainer; 15. Inner positioner; 151. Inner inner sleeve; 16. Outer positioner;

[0029] 3. Mounting bracket; 301. U-shaped channel; 302. U-shaped flange; 303. Rotation limiting flange;

[0030] 4. Fixing device; 41. Fixing sleeve; 42. Abutment screw;

[0031] 5. Movable mount; 51. Movable sleeve; 511. Second through hole; 512. Sleeve body; 513. Connecting post; 514. Limiting step; 515. Rotation limiting step; 52. Pull screw;

[0032] 6. First guide sleeve;

[0033] 7. Second guide sleeve; 71. Guide sleeve; 72. Guide cone. Detailed Implementation

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0035] Reference Figure 3A preferred embodiment of this utility model provides a patellar tunnel locator for medial patellar ligament reconstruction, comprising: a mounting frame 3, two sets of fixed mounting devices 4 fixed at opposite intervals at both ends of the mounting frame 3, a movable mounting device 5 slidably connected to the mounting frame 3, two first guide sleeves 6 and one second guide sleeve 7 for positioning and guiding the insertion of a bone drill. The two first guide sleeves 6 are detachably fixed to the two sets of fixed mounting devices 4, respectively, to press against both sides of the patella, thereby guiding the bone drill inserted therein to drill a first transverse patellar tunnel in the patella. The second guide sleeve 7 is detachably fixed to the movable mounting device 5, parallel to the first guide sleeves 6 fixed to the fixed mounting device 4, thereby guiding the bone drill inserted therein to drill a second transverse patellar tunnel in the patella parallel to the first transverse patellar tunnel.

[0036] When using the locator of this utility model for patellar tunneling, firstly, the mounting frame 3 is positioned around the outside of the patella to be tunneled, with both ends of the mounting frame 3 fixedly connected to the inner and outer sides of the patella, respectively. Then, the two sets of fixed mounting devices 4 are adjusted to fix the two first guide sleeves 6 mounted on them, so that the ends of the first guide sleeves 6 are pressed against the opposite sides of the patella. Then, the movable mounting device 5 is moved closer to one of the fixed mounting devices 4 as needed, and then the movable mounting device 5 is adjusted further. The second guide sleeve 7 and the movable installer 5 are fixed together on the mounting frame 3. At this time, the second guide sleeve 7 is parallel to the first guide sleeve 6. Finally, the two bone drills inserted into the first guide sleeve 6 and the second guide sleeve 7 are driven into the patella to establish the first transverse patellar tunnel and the second transverse patellar tunnel. The first transverse patellar tunnel is the inferior patellar ligament bone tunnel, and the second transverse patellar tunnel is the superior patellar ligament bone tunnel, thereby establishing a transverse double tunnel on the patella.

[0037] When using the locator of this invention to establish a patellar tunnel, compared with manual palpation or fluoroscopic positioning, its positioning accuracy is high, and it is less prone to deviations in the position and direction of the patellar tunnel, thereby improving surgical outcomes and reducing the risk of patellar fracture. Compared with existing positioning devices, in the locator of this invention, when the movable installer 5 is positioned close to the fixed installer, the second guide sleeve 7 mounted on the movable installer 5 can be parallel to the first guide sleeve 6 mounted on the fixed installer 4, thereby establishing a transverse double tunnel on the patella to meet surgical requirements.

[0038] Optionally, such as Figure 3As shown, the mounting bracket 3 is U-shaped, with its two ends used for fixation to the medial and lateral sides of the patient's patella, respectively. The mounting bracket 3 also has a U-shaped channel 301 extending along its length and penetrating through it. Two sets of fixation mounts 4 are fixedly installed at both ends of the opening of the mounting bracket 3. A movable mount 5 is slidably disposed within the U-shaped channel 301. In this optional solution, the mounting bracket 3 is U-shaped. On the one hand, it is convenient to be encircled around the patella to be fixed to the outer and inner sides of the patella respectively. On the other hand, the two first guide sleeves 6 fixed at both ends of the bracket can be positioned opposite each other on both sides of the patella to relatively press against the sides of the patella for positioning. The positioning is stable, and the bone drill is not easy to deviate and has high precision. At the same time, due to the "U" shape, when the movable mounting bracket 5 is close to one of the fixed mounting brackets 4, the second guide sleeve 7 fixed on the movable mounting bracket 5 can be parallel to the first guide sleeve 6 fixed on the fixed mounting bracket 4, thereby realizing the establishment of double transverse tunnels on the patella. The U-shaped channel 301 allows the movable mounting bracket 5 to slide back and forth between the two sets of fixed mounting brackets 4, which is suitable for drilling bone tunnels in the left and right patella.

[0039] Optionally, such as Figure 3 As shown, the mounting device 4 includes a fixing sleeve 41 and a pressing screw 42 that cooperate with each other. The fixing sleeve 41 is fixed to the first side of the mounting bracket 3, and a first through hole is vertically provided on the outer wall of the fixing sleeve 41. The pressing screw 42 is threaded into the mounting bracket 3 from the second side of the mounting bracket 3, and the screw of the pressing screw 42 passes through the mounting bracket 3 and presses against the first guide sleeve 6 installed in the first through hole, so that the first guide sleeve 6 is fixed in the first through hole. During operation, tighten the abutment screw 42. The screw of the abutment screw 42 passes through the mounting bracket 3 and extends into the fixing sleeve 41, abutting against the first guide sleeve 6 which is inserted into the first through hole. When the abutment screw 42 is tightened further, the end of the abutment screw 42 presses the first guide sleeve 6 against the first through hole, thereby locking and fixing the first guide sleeve 6. When disassembling, simply loosen the abutment screw 42. The installation, fixing, and disassembly of the first guide sleeve 6 are simple, time-saving, and labor-saving. The first guide sleeve 6 is also fixed stably and is not easy to loosen.

[0040] In this optional solution, the fixing sleeve 41 is a hollow cylindrical shape with one end closed and the other end open, and the open end of the fixing sleeve 41 is fixed to the first side of the mounting bracket 3. The mounting bracket 3 has a first threaded hole that is machined through the fixing sleeve 41 to connect to the inner cavity of the fixing sleeve 41, and the abutting screw 42 is threaded into the first threaded hole from the second side of the mounting bracket 3.

[0041] Optionally, such as Figure 3As shown, the movable mount 5 includes a movable sleeve 51 and a pull screw 52 that cooperate with each other. The movable sleeve 51 is inserted into the U-shaped channel 301 from the first side of the mounting bracket 3, and a second through hole 511 is vertically provided on the outer wall of the movable sleeve 51. The pull screw 52 extends into the U-shaped channel 301 from the second side of the mounting bracket 3 and is threaded onto the movable sleeve 51. During operation, tightening the lifting screw 52 causes the screw rod of the lifting screw 52 to pass through the U-shaped channel 301 and enter the movable sleeve 51, where it is threadedly connected. As the lifting screw 52 is tightened further, it pulls the movable sleeve 51 deeper into the U-shaped channel 301, thereby causing the second guide sleeve 7, which passes through the second through hole 511, to press against the first side of the mounting bracket 3, thus locking and fixing the second guide sleeve 7. During disassembly, simply loosen the lifting screw 52. The installation, fixing, and disassembly of the second guide sleeve 7 are simple, time-saving, and labor-saving. The second guide sleeve 7 is also stable and not easily loosened. Loosening the lifting screw 52 also allows the movable mount 5 to slide smoothly in the U-shaped channel 301.

[0042] In this optional solution, such as Figure 4 As shown, the movable sleeve 51 includes a hollow cylindrical sleeve body 512 and a connecting post 513 connected to the open end of the sleeve body 512. The connecting post 513 has a second threaded hole that extends through it along its axial direction. Figure 6 As shown, the lifting screw 52 includes a screw head and a screw rod connected axially. The screw rod extends from the second side of the mounting bracket 3 into the U-shaped channel 301 and is threaded into the second threaded hole.

[0043] Preferably, such as Figure 3 and Figure 4 As shown, a limiting step 514 is formed at the connection between the connecting post 513 and the sleeve body 512. U-shaped flanges 302 protruding towards the center and forming a U-shape are also provided on the two opposite side walls of the U-shaped channel 301. The U-shaped flanges 302 are used to abut against the limiting step 514 to limit the depth of the movable sleeve 51 entering the U-shaped channel 301, so as to avoid damage to the second guide sleeve 7 due to excessive force.

[0044] Preferably, such as Figure 3 and Figure 4 As shown, two opposing rotation-limiting steps 515 are machined on the outer wall of the sleeve body 512 near the connecting column 513. Rotation-limiting flanges 303 protruding towards the center are also provided on the two side walls at both ends of the U-shaped channel 301. The rotation-limiting flanges 303 cooperate with the corresponding rotation-limiting steps 515 to restrict the rotation of the movable sleeve 51 under force, thereby ensuring the parallelism between the second guide sleeve 7 and the first guide sleeve 6, and thus improving the drilling accuracy of the transverse double tunnel.

[0045] Optionally, such as Figure 5 As shown, the second guide sleeve 7 includes a guide sleeve 71 and a guide cone 72 connected sequentially along the axial direction. The guide cone 72 gradually retracts inward along the direction of the bone drill to strengthen the limiting of the bone drill, thereby improving the accuracy of the bone drill insertion and the accuracy of the subsequent bone tunnel establishment.

[0046] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A patellar tunnel locator for medial patellar ligament reconstruction, characterized in that, include: Mounting frame (3), two sets of fixed mounts (4) fixed at opposite intervals at both ends of mounting frame (3), movable mount (5) slidably connected to mounting frame (3), two first guide sleeves (6) and one second guide sleeve (7) for positioning and guiding the bone drill insertion; Two first guide sleeves (6) are respectively detachably fixed to two sets of fixation mounts (4) to press against the two sides of the human patella, thereby guiding the bone drill inserted therein to drill the first transverse patellar tunnel transversely on the patella. The second guide sleeve (7) is detachably fixed to the movable installer (5) to be parallel to the first guide sleeve (6) fixed to the fixed installer (4), thereby guiding the bone drill inserted therein to drill out a second transverse patellar tunnel parallel to the first transverse patellar tunnel on the patella.

2. The patellar tunnel locator for medial patellar ligament reconstruction according to claim 1, characterized in that, The mounting bracket (3) is U-shaped, with its two ends used to fix the patient's inner and outer sides of the patella, respectively. The mounting bracket (3) also has a U-shaped channel (301) that extends along its length and runs through it. Two sets of fixed mounts (4) are fixedly installed at both ends of the opening of the mounting bracket (3); The movable installer (5) is slidably positioned in the U-shaped channel (301).

3. The patellar tunnel locator for medial patellar ligament reconstruction according to claim 2, characterized in that, The fixed installer (4) includes a retaining sleeve (41) and a top screw (42) that cooperate. The fixing sleeve (41) is fixed to the first side of the mounting bracket (3), and a first through hole is provided vertically through the outer wall of the fixing sleeve (41); The abutting screw (42) is inserted into the mounting bracket (3) by the second side thread of the mounting bracket (3), and the screw of the abutting screw (42) passes through the mounting bracket (3) and abuts against the first guide sleeve (6) installed in the first through hole, so that the first guide sleeve (6) is fixed in the first through hole.

4. The patellar tunnel locator for medial patellar ligament reconstruction according to claim 3, characterized in that, The fixing sleeve (41) is a hollow cylinder with one end closed and the other end open, and the open end of the fixing sleeve (41) is fixed to the first side of the mounting bracket (3). The mounting bracket (3) has a first threaded hole that is machined through the fixing sleeve (41) to connect the inner cavity of the fixing sleeve (41). The abutting screw (42) is inserted into the first threaded hole from the second side thread of the mounting bracket (3).

5. The patellar tunnel locator for medial patellar ligament reconstruction according to claim 2, characterized in that, The movable installer (5) includes a movable sleeve (51) and a pull screw (52) that cooperate with each other; The movable sleeve (51) is inserted into the U-shaped channel (301) from the first side of the mounting bracket (3), and a second through hole (511) is provided vertically through the outer wall of the movable sleeve (51); The pull screw (52) extends from the second side of the mounting bracket (3) into the U-shaped channel (301) and is then threaded onto the movable sleeve (51).

6. The patellar tunnel locator for medial patellar ligament reconstruction according to claim 5, characterized in that, The movable sleeve (51) includes a hollow cylindrical sleeve body (512) and a connecting post (513) connected to the open end of the sleeve body (512). The connecting post (513) has a second threaded hole that is axially through it. The pull screw (52) includes a screw head and a screw rod connected axially, the screw rod extending from the second side of the mounting bracket (3) into the U-shaped channel (301) and threaded into the second threaded hole.

7. The patellar tunnel locator for medial patellar ligament reconstruction according to claim 6, characterized in that, A limiting step (514) is formed at the connection between the connecting post (513) and the sleeve body (512); On the two opposite side walls of the U-shaped channel (301), there are U-shaped flanges (302) that protrude toward the center and are U-shaped. The U-shaped flanges (302) are used to abut against the limiting step (514) to limit the depth of the movable sleeve (51) entering the U-shaped channel (301).

8. The patellar tunnel locator for medial patellar ligament reconstruction according to claim 6, characterized in that, Two opposing rotation-limiting steps (515) are formed by cutting the outer wall surface of the sleeve body (512) near the connecting column (513); The two side walls at both ends of the U-shaped channel (301) are also provided with a rotation limiting flange (303) protruding towards the center. The rotation limiting flange (303) is used to cooperate with the corresponding rotation limiting step (515) to limit the rotation of the movable sleeve (51) under force.

9. The patellar tunnel locator for medial patellar ligament reconstruction according to claim 1, characterized in that, The second guide sleeve (7) includes a guide sleeve (71) and a guide cone (72) connected in sequence along the axial direction. The guide cone (72) gradually retracts inward along the direction of the bone drill to strengthen the limiting of the bone drill.

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