Sesamoid fusion device

Abstract

The application belongs to the technical field of medical devices, and discloses a foot navicular bone fusion piece. The foot navicular bone fusion piece is provided in a columnar structure, and comprises oppositely arranged first and second surfaces. The first surface is provided as a concave surface, and the second surface is provided as a convex surface. The foot navicular bone fusion piece is provided with a plurality of universal threaded holes penetrating through the first and second surfaces. The universal threaded holes are uniformly distributed along the circumference of the foot navicular bone fusion piece, and the axis of the universal threaded holes and the axis of the columnar structure are provided at an included angle. The foot navicular bone fusion piece is further provided with a clamping portion at the center thereof. The second surface is provided with a plurality of insertion pins uniformly distributed along the circumference. The foot navicular bone fusion piece provided by the application is used as follows. The convex surface is attached to a wound, universal screws are implanted in the universal threaded holes, and the universal screws are screwed into the universal threaded holes one by one. The universal screws lock and fix the foot navicular bone fusion piece on the foot navicular bone, and the locking is stable and reliable.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a foot-navicular bone fusion component. Background Technology

[0002] The causes of navicular fractures are well-defined and varied. Common causative factors include direct trauma such as falls from heights or impacts from heavy objects, and indirect trauma such as ligament traction. Both factors can lead to navicular fractures. As the highest point of the medial longitudinal arch of the foot and a component of the locking mechanism of the transverse tarsal joint, the navicular bone plays a crucial role in the anatomical and biomechanical structure of the foot. It is essential for maintaining midfoot stability, transmitting load, and controlling hindfoot movement.

[0003] Currently, the clinical treatment for comminuted fractures of the navicular bone generally involves open reduction and fixation surgery. This involves fixing a bone plate to the navicular bone with screws. This method results in a large incision, and since the soft tissue at the navicular bone is thin, the probability of nonunion due to incision infection is high, and the healing time is prolonged. Furthermore, the fixation method of the bone plate and screws, as well as the number and angle of screw fixation, are limited by the design of the bone plate, leading to poor fixation results for comminuted fractures. Insufficient holding force on the fracture fragments after implantation also affects the stability of the fracture site.

[0004] The bone plates used in current techniques need to span the talus, navicular bone, and first cuneiform bone. This large span limits the safe range of the bone screws within the talus, preventing the insertion of multiple screws. Consequently, the bone plate does not adhere well to the affected area, resulting in inadequate fixation. Furthermore, the surface of the navicular bone is largely articular cartilage, leading to poor blood supply in the vicinity. Excessive surgical incision can cause complications such as avascular necrosis or nonunion. Improper treatment of a navicular fracture can cause abnormal movement of the talus, navicular, and cuneiform joints during walking, resulting in severe pain. The blood supply to the navicular bone is severely disrupted after a fracture, making it prone to avascular necrosis. Summary of the Invention

[0005] The purpose of this invention is to provide a navicular bone fusion component for repositioning and fixing the navicular bone after fracture, aiming to improve the fit and matching between the navicular bone fusion component and the affected area, and improve the fixation effect.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A navicular bone fusion component is provided, wherein the navicular bone fusion component is configured as a columnar structure, and the navicular bone fusion component includes a first surface and a second surface disposed opposite to each other. The first surface is configured as a concave surface, and the second surface is configured as a convex surface. The navicular bone fusion component is provided with a plurality of universal threaded holes penetrating the first surface and the second surface. The plurality of universal threaded holes are evenly distributed along the circumference of the navicular bone fusion component, and the axis of the universal threaded holes is set at an angle to the axis of the columnar structure. A clamping part is also provided at the center of the navicular bone fusion component, and a plurality of pins are protruding from the second surface and evenly distributed along the circumference.

[0008] Optionally, the wall of the universal threaded hole has a threaded portion and a plurality of isolation grooves penetrating the first surface and the second surface, the isolation grooves being able to divide the threaded portion into multiple rows of sub-threaded portions.

[0009] Optionally, the number of isolation slots is 4 to 8.

[0010] Optionally, the angle between the axis of the universal threaded hole and the axis of the columnar structure is 30 degrees to 60 degrees.

[0011] Optionally, the connection between the universal threaded hole and the first surface is provided with a spherical part.

[0012] Optionally, the navicular bone fusion component is further provided with a plurality of Kirschner wire holes penetrating the first surface and the second surface. The Kirschner wire holes are located on the outside of the clamping part and on the inside of the universal thread hole. The plurality of Kirschner wire holes are evenly distributed along the circumference of the navicular bone fusion component.

[0013] Optionally, the clamping part is configured as a clamping hole that passes through the first surface and the second surface.

[0014] Optionally, the pins are configured as an inverted triangle structure.

[0015] Optionally, the pin has a plurality of reverse teeth protruding on the side near the axis of the columnar structure.

[0016] Optionally, the diameter d of the columnar structure is 15mm to 20mm.

[0017] The beneficial effects of this invention are as follows: The navicular bone fusion component provided by this invention has a first concave surface and a second convex surface. Multiple universal threaded holes are evenly distributed circumferentially along the navicular bone fusion component, and the axes of the universal threaded holes and the axis of the columnar structure are set at an angle. During use, the convex surface fits against the wound, reducing irritation to the surrounding soft tissues and accelerating healing. Universal screws are implanted into the universal threaded holes, and multiple universal screws are screwed into the holes one-to-one, locking and fixing the navicular bone fusion component to the navicular bone. It is stable and reliable; by setting a clamping part at the center of the navicular bone fusion component, a clamping device can be used to hold the clamping part and place the navicular bone fusion component into the affected area, improving the convenience of operation; by protruding multiple pins evenly distributed circumferentially on the second surface, pressure is applied to the navicular bone fusion component during surgery to make the pins embed into the bone, increasing the installation stability of the navicular bone fusion component; by setting the navicular bone fusion component as a columnar structure, only the navicular bone and cuneiform bone are involved in the operation, reducing the incision, and the columnar structure is easy to process, improving the convenience of processing. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the navicular bone fusion component from one perspective provided in an embodiment of the present invention;

[0019] Figure 2 This is a front view of the navicular bone fusion component provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the navicular bone fusion component provided in this embodiment of the invention, which is installed behind the navicular bone using universal screws;

[0021] Figure 4 This is a schematic diagram of the structure of the cap and navicular bone provided in an embodiment of the present invention.

[0022] In the picture:

[0023] 100. Foot-navicular bone fusion component; 110. First surface; 120. Second surface; 130. Universal threaded hole; 131. Isolation groove; 132. Threaded part; 140. Clamping part; 150. Pin; 160. Spherical part; 170. Kirschner wire hole; 180. Back teeth; 190. Cover body;

[0024] 200. Universal screw;

[0025] 300. navicular bone. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0027] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0030] This embodiment provides a navicular bone fusion piece for reducing and fixing the navicular bone after a fracture, aiming to improve the fit and matching between the navicular bone fusion piece and the affected area, and improve the fixation effect.

[0031] like Figures 1-4As shown, the navicular bone fusion component 100 is configured as a columnar structure. The navicular bone fusion component 100 includes a first surface 110 and a second surface 120 disposed opposite to each other. The first surface 110 is a concave surface, and the second surface 120 is a convex surface. The navicular bone fusion component 100 is provided with a plurality of universal threaded holes 130 penetrating the first surface 110 and the second surface 120. The plurality of universal threaded holes 130 are evenly distributed along the circumference of the navicular bone fusion component 100, and the axis of the universal threaded holes 130 is set at an angle to the axis of the columnar structure. A clamping part 140 is also provided at the center of the navicular bone fusion component 100. The second surface 120 is provided with a plurality of pins 150 evenly distributed along the circumference.

[0032] The navicular bone fusion component 100 provided in this embodiment features a first surface 110 that is concave and a second surface 120 that is convex. Multiple universal threaded holes 130 are evenly distributed circumferentially around the navicular bone fusion component 100, with the axes of the universal threaded holes 130 and the axis of the columnar structure forming an angle. In use, the convex surface fits against the wound site of the navicular bone 300, reducing irritation to the surrounding soft tissues and accelerating healing. Universal screws 200 are implanted into the universal threaded holes 130, with each universal screw 200 correspondingly screwed into one of the holes 130, thus locking and fixing the navicular bone fusion component 100 to the navicular bone 300. The locking mechanism is stable and reliable. By providing a clamping part 140 at the center of the navicular bone fusion component 100, a clamping device can be used to hold the clamping part 140 and place the navicular bone fusion component 100 into the affected area, improving the ease of operation. By providing multiple protruding pins 150 evenly distributed circumferentially on the second surface 120, pressure is applied to the navicular bone fusion component 100 during surgery to embed the pins 150 into the bone, increasing the installation stability of the navicular bone fusion component 100. By setting the navicular bone fusion component 100 as a columnar structure, only the navicular bone 300 and the cuneiform bone are involved in the operation, reducing the incision. Moreover, the columnar structure is easy to process, improving the ease of processing.

[0033] See also Figure 1 and Figure 2Optionally, the wall of the universal threaded hole 130 has a threaded portion and multiple isolation grooves 131 penetrating the first surface 110 and the second surface 120. The isolation grooves 131 can divide the threaded portion into multiple rows of sub-threaded portions 132. When the universal screw 200 is screwed into the universal threaded hole 130, the universal screw 200 and the multiple rows of sub-threaded portions 132 in the universal threaded hole 130 form multiple thread locking points to achieve a stable lock. Optionally, the number of isolation grooves 131 is 4 to 8. In this embodiment, there are 4 isolation grooves 131. The universal screw 200 and the four rows of sub-threaded portions 132 in the universal threaded hole 130 are staggered to form four thread locking points, achieving multi-directional locking. In other embodiments, the number of isolation grooves 131 can be set to other values, such as 5 or 6, as needed.

[0034] Furthermore, the angle between the axis of the universal threaded hole 130 and the axis of the columnar structure is 30 to 60 degrees. After the second surface 120 of the navicular bone fusion component 100 is attached to the affected area, the universal screw 200 is screwed into the affected area along the universal threaded hole 130. The angle between the axis of the universal threaded hole 130 and the axis of the columnar structure is 30 to 60 degrees, so that multiple universal screws 200 enter the navicular bone 300 in a claw-like manner, improving the stability of fixation. In this embodiment, the angle between the axis of the universal threaded hole 130 and the axis of the columnar structure is 30 degrees.

[0035] Preferably, a spherical part 160 is provided at the connection between the universal threaded hole 130 and the first surface 110. The spherical part 160 is compatible with existing universal screw 200 products. After the universal screw 200 is screwed into the universal threaded hole 130, the end of the universal screw 200 fits against the spherical part 160, improving the installation stability of the universal screw 200.

[0036] Optionally, the diameter d of the columnar structure is 15mm to 20mm to meet the treatment requirements of most comminuted fractures of the navicular bone, expand the scope of application, and avoid excessive size, which would lead to an excessively large wound and effectively reduce the risk of complications.

[0037] In this embodiment, the clamping part 140 is configured as a clamping hole that passes through the first surface 110 and the second surface 120, which facilitates manufacturing and reduces processing costs.

[0038] Optionally, the navicular bone fusion component 100 also has a plurality of Kirschner wire holes 170 penetrating the first surface 110 and the second surface 120. The Kirschner wire holes 170 are located on the outer side of the clamping part 140 and on the inner side of the universal thread hole 130, and the plurality of Kirschner wire holes 170 are evenly distributed along the circumference of the navicular bone fusion component 100. During the operation, Kirschner wires can be inserted into the Kirschner wire holes 170 to position and fix the navicular bone fusion component 100.

[0039] In this embodiment, the insert 150 is configured as an inverted triangular structure. During surgery, pressure is applied to the navicular bone fusion member 100, and the small end of the insert 150 contacts the bone first and embeds itself into the bone. The small contact area between the small end of the insert 150 and the bone facilitates smooth embedding into the bone and improves embedding efficiency. Optionally, the small end of the insert 150 is at an α angle, with the α angle ranging from 15 degrees to 20 degrees.

[0040] Preferably, the pin 150 has a plurality of reverse teeth 180 protruding on the side near the axis of the columnar structure. The reverse teeth 180 can increase the anti-dislodgement of the navicular bone fusion member 100 and prevent the navicular bone fusion member 100 from displacing during the screwing in of the universal screw 200.

[0041] See Figure 4 After the navicular bone fusion component 100 is implanted, in order to prevent debris from entering the gaps in the navicular bone fusion component 100, a cover 190 for sealing can be placed on the navicular bone fusion component 100 to improve the reliability of the navicular bone fusion component 100.

[0042] The implantation process of the navicular bone fusion component 100 provided in this embodiment includes:

[0043] Step 1: Make a 300° incision in the navicular bone, remove excess bone fragments, and use Kirschner wires and a reamer to locate the surgical site;

[0044] Step 2: Next, drill holes with a drill bit, remove the bone fragments, and fill the gaps with filler.

[0045] Step 3: Implant the navicular bone fusion component 100. Insert Kirschner wires into the Kirschner wire holes 170 of the navicular bone fusion component 100 to fix the navicular bone fusion component 100. Use instruments to make guide holes and then implant universal screws 200.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A navicular fusion member, comprising: The navicular bone fusion component is configured as a columnar structure. The navicular bone fusion component includes a first surface (110) and a second surface (120) disposed opposite to each other. The first surface (110) is configured as a concave surface, and the second surface (120) is configured as a convex surface. The navicular bone fusion component is provided with a plurality of universal threaded holes (130) penetrating the first surface (110) and the second surface (120). The plurality of universal threaded holes (130) are evenly distributed along the circumference of the navicular bone fusion component, and the axis of the universal threaded holes (130) is set at an angle to the axis of the columnar structure. A clamping part (140) is also provided at the center of the navicular bone fusion component. The second surface (120) is provided with a plurality of pins (150) evenly distributed along the circumference.

2. The talonavicular fusion member of claim 1, wherein, The wall of the universal threaded hole (130) has a threaded portion and a plurality of isolation grooves (131) penetrating the first surface (110) and the second surface (120). The isolation grooves (131) can divide the threaded portion into multiple rows of sub-threaded portions (132).

3. The talonavicular fusion member of claim 2, wherein, The number of isolation slots (131) is 4 to 8.

4. The talonavicular fusion member of claim 1, wherein, The angle between the axis of the universal threaded hole (130) and the axis of the columnar structure is 30 degrees to 60 degrees.

5. The talonavicular fusion member of claim 1, wherein, A spherical part (160) is provided at the connection between the universal threaded hole (130) and the first surface (110).

6. The navicular bone fusion member according to claim 1, characterized in that, The navicular bone fusion component is further provided with a plurality of Kirschner wire holes (170) penetrating the first surface (110) and the second surface (120). The Kirschner wire holes (170) are located on the outside of the clamping part (140) and on the inside of the universal thread hole (130). The plurality of Kirschner wire holes (170) are evenly distributed along the circumference of the navicular bone fusion component.

7. The navicular bone fusion member according to claim 1, characterized in that, The clamping part (140) is configured as a clamping hole that passes through the first surface (110) and the second surface (120).

8. The navicular bone fusion member according to claim 1, characterized in that, The pin (150) is configured as an inverted triangle.

9. The navicular bone fusion member according to claim 1, characterized in that, The pin (150) has a plurality of inverted teeth (180) protruding on the side near the axis of the columnar structure.

10. The navicular bone fusion member according to claim 1, characterized in that, The diameter d of the columnar structure is 15mm to 20mm.

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