Patella punching positioning assembly

Abstract

A patella punching and positioning assembly relates to the technical field of medical equipment and comprises a first fixing plate and a second fixing plate which are attached to two adjacent sides of a patella and connected into a whole. Fixing holes are formed in the first fixing plate and the second fixing plate, positioning rods used for being inserted into patella to achieve fixing are arranged in the fixing holes, guide sleeves are arranged on the first fixing plate and the second fixing plate and are grouped in a one-to-one correspondence mode, and the axes of the two guide sleeves in each group intersect and form an obtuse angle. The patella punching positioning assembly is simple in structure and convenient to use, can position and guide the drilling position, improves the drilling accuracy, facilitates formation of an L-shaped bone tunnel, improves the operation efficiency, reduces the operation difficulty and is suitable for reconstruction of inner patellofemoral ligaments.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a patella drilling and positioning component. Background Art

[0002] Medial patellofemoral ligament reconstruction is a commonly used method for treating recurrent patellar dislocation. During the medial patellofemoral ligament reconstruction process, it is usually necessary to drill holes on both sides of the patella to form an L-shaped bone tunnel. The tendon is then inserted into the bone tunnel to pull the patella to the middle position for reduction and fixation. The bone tunnel drilling operation generally relies on the doctor's experience and technique control. Sometimes, the hole position will be offset due to inaccurate judgment or operational error, thereby affecting the intersection and connectivity of the bone tunnels. Utility Model Content

[0003] The purpose of the utility model is to provide a patellar drilling positioning component which is convenient for positioning and guiding the drilling position during medial patellofemoral ligament reconstruction surgery, so as to reduce the difficulty of the surgery and improve the efficiency of the surgery.

[0004] To achieve the above objectives, the present invention employs the following technical solution: a patellar drilling and positioning assembly comprising a first fixing plate and a second fixing plate for contacting adjacent sides of the patella (e.g., the top and front or back sides of the patella). The first and second fixing plates are integrally connected, each having a fixing hole, each equipped with a positioning rod for inserting into the hole to secure the patella. Furthermore, the first and second fixing plates are each provided with a guide sleeve, and the guide sleeves are arranged in corresponding groups, with the axes of the two guide sleeves in each group intersecting and forming an obtuse angle. The positioning rods may be Kirschner wires.

[0005] Furthermore, the guide sleeve is threadedly mounted on the first fixing plate and the second fixing plate.

[0006] Furthermore, the first fixing plate and the second fixing plate are both provided with a first waist-shaped hole, the first waist-shaped hole includes first threaded holes located at both ends thereof, and the guide sleeve is installed in the first threaded holes.

[0007] Furthermore, the distance between the centers of the first threaded holes at both ends of the first waist-shaped hole is 1 to 3 mm. The two first threaded holes of each first waist-shaped hole can provide two installation positions for the guide sleeve, making it easy to select a suitable position according to needs and improving flexibility.

[0008] Furthermore, the two guide sleeves in each group are installed on the first fixed plate and the second fixed plate through a movable plate, and the two ends of the movable plate are provided with parallel strip grooves, and the first fixed plate and the second fixed plate are provided with adjusting bolts and the adjusting bolts are installed in the strip grooves. The movable plate can drive the guide sleeve to move along the strip groove after the adjusting bolt is loosened and can be fixed after the adjusting bolt is tightened, and the first fixed plate and the second fixed plate are provided with through holes corresponding to the moving areas of the guide sleeves.

[0009] Furthermore, the guide sleeve is threadedly mounted on the movable plate.

[0010] Furthermore, a second waist-shaped hole is provided on the movable plate, the second waist-shaped hole includes second threaded holes located at both ends thereof, and the guide sleeve is installed in the second threaded holes.

[0011] Furthermore, the shape of the movable plate is adapted to the shapes of the first fixed plate and the second fixed plate.

[0012] Furthermore, the first fixing plate and the second fixing plate are arranged at an angle and the connecting portion is in an arc shape. The angle between the two fixing plates can be a right angle or an obtuse angle, forming an L shape, and together forming an L-shaped fixing plate.

[0013] Furthermore, the number of guide sleeves provided on the first fixing plate and the second fixing plate is at least two (for example, two), and the number of fixing holes provided on the first fixing plate and the second fixing plate is at least one (for example, one).

[0014] When using the patella drilling and positioning assembly, first place the first and second fixing plates against the patella and adjust them to the appropriate position. Next, align the fixing holes and insert the positioning rod into the patella to ensure the stability of the assembly on the patella. Then, drill a bone tunnel on one side of the patella along the direction of a guide sleeve, and withdraw the drill bit after reaching the predetermined depth. After that, drill a bone tunnel on the other side of the patella along the direction of another guide sleeve until the front ends of the two bone tunnels intersect at a predetermined position to form the required L-shaped bone tunnel. During this process, by controlling the drilling depth of the drill bit (for example, using a depth-limiting drill bit), the intersection and connection of the bone tunnels can be accurately achieved.

[0015] The above-mentioned patellar drilling positioning component has a simple structure and is easy to use. It can locate and guide the drilling position, improve the accuracy of drilling, facilitate the formation of L-shaped bone tunnels, improve surgical efficiency, reduce surgical difficulty, and is suitable for medial patellofemoral ligament reconstruction surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the patella drilling and positioning assembly installed on the patella in Example 1;

[0017] Figure 2 A three-dimensional image of the patella;

[0018] Figure 3 Schematic diagram of the structure of the patella drilling and positioning assembly in Example 1;

[0019] Figure 4 This is a cross-sectional view of the patella after a bone tunnel is drilled on the patella using the patella drilling and positioning assembly in Example 1;

[0020] Figure 5 is a three-dimensional diagram of the L-shaped fixing plate in Example 1;

[0021] Figure 6 This is a schematic diagram of the patella drilling and positioning assembly installed on the patella in Example 2;

[0022] Figure 7 Schematic diagram of the structure of the patellar drilling and positioning assembly in Example 2;

[0023] Figure 8 This is an exploded view of the patellar drilling and positioning assembly in Example 2;

[0024] Figure 9 This is a cross-sectional view of the patella after a bone tunnel is drilled on the patella using the patella drilling and positioning assembly in Example 2;

[0025] Figure 10 This is a three-dimensional diagram of the movable plate in Example 2.

[0026] In the picture:

[0027] 1 - L-shaped fixing plate 1a - first fixing plate

[0028] 1b——Second fixing plate 1c——Fixing hole

[0029] 1d——first waist hole 1f——through hole

[0030] 2——Positioning rod 3——Guide sleeve

[0031] 4 - Patella 4a - L-shaped bone tunnel

[0032] 5 - Patellar ligament 6 - Activity plate

[0033] 6a——strip-shaped through groove 6b——second waist-shaped hole

[0034] 7——Adjusting bolt. DETAILED DESCRIPTION

[0035] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention. Example 1

[0036] like Figure 1 and Figure 3-5 As shown, this embodiment provides a patella drilling positioning assembly, which includes an L-shaped fixing plate 1, a guide sleeve 3 and a positioning rod 2. The L-shaped fixing plate 1 is used to abut and be fixed on the patella 4, and includes a first fixing plate 1a and a second fixing plate 1b. The two fixing plates are arranged at an angle (usually perpendicular to each other or the angle is an obtuse angle) and are connected as a whole to form the L-shaped fixing plate 1. The aforementioned two fixing plates can be abutted against the adjacent two sides of the patella 4. For example, the first fixing plate 1a can be used to abut against the top of the patella 4, and the second fixing plate 1b can be used to abut against the front or back side of the patella 4. Of course, their positions are interchangeable. Among them, the two ends of the patella 4 are usually connected with the patellar ligament 5, which can be seen in FIG. Figure 1 、 2 . In order to fix the L-shaped fixing plate 1 on the patella 4, a fixing hole 1c can be provided on the first fixing plate 1a and the second fixing plate 1b respectively, and then the positioning rod 2 is aligned with the fixing hole 1c and inserted into the patella 4 to achieve fixation. The positioning rod 2 can be a Kirschner wire or other positionable component commonly used in medicine. Generally speaking, positioning and fixation can be achieved by fixing a positioning rod 2 on each of the first fixing plate 1a and the second fixing plate 1b that are arranged at an angle, but in order to further improve the stability during the surgical operation, the number of fixing holes 1c and positioning rods 2 can also be appropriately increased according to demand. Of course, in order to reduce damage to the patella 4 and improve surgical efficiency at the same time, it is more appropriate to provide a fixing hole 1c and a positioning rod 2 on each of the first fixing plate 1a and the second fixing plate 1b. After the L-shaped fixing plate 1 is fixed to the patella 4, it can provide a stable operating platform for subsequent drilling operations. In order to allow the drill bit to drill in a specific direction and improve drilling accuracy, an appropriate number of guide sleeves 3 can be provided on the first fixing plate 1a and the second fixing plate 1b. The guide sleeves 3 serve as guides for the drill bit. Generally speaking, two L-shaped bone tunnels 4a need to be drilled in the patella 4. Therefore, two guide sleeves 3 can be provided on each of the first fixing plate 1a and the second fixing plate 1b. The guide sleeves 3 on the two fixing plates are grouped in a one-to-one correspondence, thereby forming two groups of guide sleeves 3. These two groups of guide sleeves 3 can be parallel to each other. Of course, the number of guide sleeves 3 can also be other depending on the needs. In order for the two bone tunnels drilled by the drill bit along the guide sleeves 3 to intersect and connect, the axes of the two guide sleeves 3 in each group should intersect, and the angle formed by the intersection should be obtuse. The L-shaped bone tunnels 4a formed in this obtuse structure can facilitate the smooth passage of the tendon. In addition, these guide sleeves 3 are all identical. In addition, the corners of the L-shaped fixing plate 1 (ie, the connection between the first fixing plate 1 a and the second fixing plate 1 b ) can be smoothed or configured into an arc shape so that the entire structure is inclined toward an arc shape to better fit the patella 4 .

[0037] The guide sleeve 3 can be integrally connected or fixedly connected to the first fixing plate 1a and the second fixing plate 1b, or it can be detachably mounted on the first fixing plate 1a and the second fixing plate 1b. Comparatively speaking, the latter method (i.e., detachable connection) is more preferred. In this way, the guide sleeve 3 can be installed after the first fixing plate 1a and the second fixing plate 1b are fixed to the patella 4, thereby avoiding interference with the installation of the positioning rod 2 before drilling. At the same time, the detachable structure is also convenient for carrying and replacing parts. Among them, the detachable connection method includes but is not limited to a threaded connection. In the present embodiment, the guide sleeve 3 is threadedly mounted on the first fixing plate 1a and the second fixing plate 1b and connected by threads. This makes disassembly and assembly more convenient, and the structure is also relatively simple and easy to implement.

[0038] Among them, threaded holes for installing the guide sleeve 3 are provided on the first fixing plate 1a and the second fixing plate 1b. Generally speaking, each guide sleeve 3 is equipped with one threaded hole, but in order to improve its flexibility and enable it to adjust its position according to needs, each guide sleeve 3 can be equipped with multiple threaded holes. Of course, in order to simplify the structure and save space, each guide sleeve 3 can be equipped with two threaded holes, and these two threaded holes can be combined to form a waist-shaped hole, namely the first waist-shaped hole 1d. The first waist-shaped hole 1d can not only fix the guide sleeve 3, but also provide two different installation positions for the guide sleeve 3, so that the position can be adjusted according to needs, which is more flexible. Specifically, if Figure 5 As shown, both ends of the first waist-shaped hole 1d are first threaded holes with a semicircular structure, and the guide sleeve 3 can be installed in the first threaded holes. The distance between the centers of the two first threaded holes can be selected as required. For example, setting the distance between the centers of the two first threaded holes to 2 mm can achieve fine-tuning of the position.

[0039] When using the patella drilling and positioning assembly, first place the L-shaped fixing plate 1 (i.e., the first fixing plate 1a and the second fixing plate 1b) against the patella 4 and adjust it to the appropriate position. Next, align the fixing hole 1c and insert the positioning rod 2 into the patella 4 (or first align the fixing hole 1c and drill a hole on the patella 4, and then insert the positioning rod 2 into the drilled hole) to ensure the stability of the assembly on the patella 4. Then, install the guide sleeve 3 at the appropriate position of the first waist-shaped hole 1d and determine the drilling position of the drill bit. Then, drill a bone tunnel on one side of the patella 4 along the direction of one guide sleeve 3, and withdraw the drill bit after reaching the predetermined depth. Afterwards, drill a bone tunnel on the other side of the patella 4 along the direction of the other guide sleeve 3 until the front ends of the two bone tunnels intersect at the predetermined position to form the required L-shaped bone tunnel 4a, which can be seen in FIG. Figure 4During this process, by controlling the drilling depth of the drill bit (for example, using a depth-limiting drill bit), the intersection and connection of the bone tunnels can be accurately achieved. In addition, drilling multiple L-shaped bone tunnels 4a only requires repeating the above-mentioned drilling steps. The above-mentioned patellar drilling and positioning assembly has a simple structure and is easy to use. It can locate and guide the drilling position, improve the accuracy of the drilling, facilitate the formation of the L-shaped bone tunnel 4a, improve the efficiency of the operation, reduce the difficulty of the operation, and is suitable for medial patellofemoral ligament reconstruction. Example 2

[0040] The difference between this embodiment and embodiment 1 is that the guide sleeve 3 is not directly mounted on the L-shaped fixed plate 1, but is mounted on the L-shaped fixed plate 1 through the movable plate 6. Specifically, Figure 6-10 As shown, the L-shaped fixed plate 1 is provided with movable plates 6. The number of movable plates 6 corresponds to the number of guide sleeve 3 groups. For example, two sets of guide sleeves 3 correspond to two movable plates 6. Each set of two guide sleeves 3 is mounted at each end of the movable plate 6, which is located on the first fixed plate 1a and the second fixed plate 1b, respectively. Each end of the movable plate 6 is provided with a through-slot 6a, which is parallel to the first fixed plate 1a and the second fixed plate 1b. Each through-slot 6a is threaded with an adjustment bolt 7, which is threaded onto the first fixed plate 1a and the second fixed plate 1b, allowing the movable plate 6 to be fixed to the first fixed plate 1a and the second fixed plate 1b. When the adjustment bolts 7 are loosened, the movable plate 6 can move along the through-slot 6a, and the guide sleeve 3 moves synchronously with it, thereby changing its position. When the adjustment bolts 7 are tightened, the movable plate 6 is fixed to the first fixed plate 1a and the second fixed plate 1b, and the guide sleeve 3 is also fixed. To allow the drill bit to drill the patella 4 through the first fixing plate 1a or the second fixing plate 1b along the direction of the guide sleeve 3, a through hole 1f corresponding to the movable area of the guide sleeve 3 is provided on each of the first fixing plate 1a and the second fixing plate 1b. This allows the drill bit to drill the patella 4 through the through hole 1f along the direction of the guide sleeve 3 regardless of where the guide sleeve 3 moves. The area of the through hole 1f can be larger than the movable area of the guide sleeve 3. Of course, since the movable path of the guide sleeve 3 is a straight line, the through hole 1f can be configured as a strip.

[0041] In order to allow the movable plate 6 to move smoothly on the first fixed plate 1a and the second fixed plate 1b, the shape of the movable plate 6 can be adapted to the shapes of the first fixed plate 1a and the second fixed plate 1b. For example, the shape of the movable plate 6 can be set to be L-shaped.

[0042] The connection structure between the guide sleeve 3 and the movable plate 6 in this embodiment is similar to the connection structure between the guide sleeve 3 and the L-shaped fixed plate 1 in Example 1. Specifically, the guide sleeve 3 can be fixedly connected to the movable plate 6 or detachably mounted on the movable plate 6. A detachable connection is preferred, as this provides greater flexibility and facilitates component replacement and storage. Examples of detachable connection methods include, but are not limited to, threaded connections. In this embodiment, the guide sleeve 3 is threadedly mounted on the movable plate 6, connected via threads. This makes assembly and disassembly more convenient, and the structure is relatively simple and easy to implement. The movable plate 6 is provided with threaded holes for mounting the guide sleeves 3. Generally, each guide sleeve 3 is provided with one threaded hole. However, to increase flexibility and enable adjustment of the position as needed, each guide sleeve 3 can be provided with multiple threaded holes. Of course, to simplify the structure and save space, each guide sleeve 3 can be provided with two threaded holes, which can be combined to form a waist-shaped hole, i.e., the second waist-shaped hole 6b. The second waist-shaped hole 6b can not only fix the guide sleeve 3, but also provide two different installation positions for the guide sleeve 3, so as to further adjust the position according to the needs, which is more flexible. Figure 10 As shown, the second waist-shaped hole 6b has two semicircular second threaded holes at both ends, into which the guide sleeve 3 can be installed. The distance between the centers of the two second threaded holes can be selected as needed. For example, setting the distance between the centers of the two second threaded holes to 2 mm allows for fine-tuning of the position.

[0043] In this embodiment, an adjustable movable plate 6 is provided so that the two guide sleeves 3 mounted on the movable plate 6 can move synchronously, which makes it easy to adjust the distance between the two L-shaped bone tunnels 4a, and the provision of the second waist-shaped hole 6b provides further adjustment function.

[0044] When using the patella drilling and positioning assembly, first place the L-shaped fixing plate 1 (i.e., the first fixing plate 1a and the second fixing plate 1b) against the patella 4 and adjust it to the appropriate position. Next, align the fixing hole 1c and insert the positioning rod 2 into the patella 4 (or first align the fixing hole 1c and drill a hole in the patella 4, then insert the positioning rod 2 into the drilled hole) to ensure the stability of the assembly on the patella 4. Then, adjust the movable plate 6 to the appropriate position and tighten the adjustment bolt 7 to secure it. Then, install the guide sleeve 3 in the appropriate position of the second waist-shaped hole 6b and determine the drilling position of the drill bit (of course, you can also first install the guide sleeve 3 in the appropriate position of the second waist-shaped hole 6b and then adjust the position of the movable plate 6). Then, drill a bone tunnel on one side of the patella 4 along the direction of one guide sleeve 3, and withdraw the drill bit after reaching the predetermined depth. Afterwards, the bone tunnel on the other side of the patella 4 is drilled along the direction of the other guide sleeve 3 until the front ends of the two bone tunnels meet at a predetermined position to form the required L-shaped bone tunnel 4a. Figure 9 During this process, by controlling the drilling depth of the drill bit (for example, using a depth-limiting drill bit), the intersection and connection of the bone tunnels can be accurately achieved. In addition, drilling multiple L-shaped bone tunnels 4a only requires repeating the above drilling steps.

[0045] The other parts are the same as those in Example 1 and will not be described again here.

[0046] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation on the present invention. Although the present invention has disclosed the preferred embodiment as above, it is not intended to limit the form and style of the product of the present invention. Any technician familiar with this profession can make some changes or modifications to the technical content disclosed above without departing from the scope of the technical solution of the present invention. Any content that does not depart from the technical solution of the present invention falls within the patent scope of the technical solution of the present invention.

Claims

1. Patellar drilling and positioning assembly, characterized by: The invention comprises a first fixing plate (1a) and a second fixing plate (1b) for abutting against adjacent sides of the patella, and the first fixing plate (1a) and the second fixing plate (1b) are connected as a whole, the first fixing plate (1a) and the second fixing plate (1b) are both provided with fixing holes (1c), and the fixing holes (1c) are equipped with positioning rods (2) for inserting the patella to achieve fixation, the first fixing plate (1a) and the second fixing plate (1b) are both provided with guide sleeves (3), and the guide sleeves (3) are grouped in a one-to-one manner, and the axes of the two guide sleeves (3) in each group intersect and form an obtuse angle.

2. The patellar drilling and positioning assembly according to claim 1, characterized in that: The guide sleeve (3) is threadedly mounted on the first fixing plate (1a) and the second fixing plate (1b).

3. The patellar drilling and positioning assembly according to claim 2, characterized in that: The first fixing plate (1a) and the second fixing plate (1b) are both provided with a first waist-shaped hole (1d), the first waist-shaped hole (1d) comprising first threaded holes at both ends thereof, and the guide sleeve (3) is installed in the first threaded holes.

4. The patellar drilling and positioning assembly according to claim 3, characterized in that: The distance between the centers of the first threaded holes at both ends of the first waist-shaped hole (1d) is 1 to 3 mm.

5. The patella drilling and positioning assembly according to claim 1, characterized in that: The two guide sleeves (3) of each group are mounted on the first fixed plate (1a) and the second fixed plate (1b) via a movable plate (6); parallel strip grooves (6a) are provided at both ends of the movable plate (6); adjusting bolts (7) are provided on the first fixed plate (1a) and the second fixed plate (1b), and the adjusting bolts (7) are mounted in the strip grooves (6a); the movable plate (6) can drive the guide sleeves (3) to move along the strip grooves (6a) after the adjusting bolts (7) are loosened and can be fixed after the adjusting bolts (7) are tightened; through holes (1f) corresponding to the moving areas of the guide sleeves (3) are provided on the first fixed plate (1a) and the second fixed plate (1b).

6. The patella drilling and positioning assembly according to claim 5, characterized in that: The guide sleeve (3) is threadedly mounted on the movable plate (6).

7. The patella drilling and positioning assembly according to claim 6, characterized in that: A second waist-shaped hole (6b) is provided on the movable plate (6), the second waist-shaped hole (6b) includes second threaded holes at both ends thereof, and the guide sleeve (3) is installed in the second threaded holes.

8. The patella drilling and positioning assembly according to claim 5, characterized in that: The shape of the movable plate (6) is adapted to the shapes of the first fixed plate (1a) and the second fixed plate (1b).

9. The patella drilling and positioning assembly according to claim 1, characterized in that: The first fixing plate (1a) and the second fixing plate (1b) are arranged at an angle and the connecting portion is in an arc shape.

10. The patella drilling and positioning assembly according to any one of claims 1 to 9, characterized in that: The number of guide sleeves (3) provided on the first fixing plate (1a) and the second fixing plate (1b) is at least two, and the number of fixing holes (1c) provided on the first fixing plate (1a) and the second fixing plate (1b) is at least one.

Images