Positioning device of hand fracture internal fixator

Abstract

The utility model discloses a positioning device of a hand fracture internal fixator, which comprises a positioning plate, a plurality of guide holes are formed in the positioning plate in a penetrating manner, and threaded connection holes are formed in the upper parts of several of the guide holes; a plurality of threaded connectors in threaded connection with the threaded connection holes are further included, first screwing bolts are arranged at one ends of the threaded connectors, extrusion shafts are arranged at the other ends of the threaded connectors, and the extrusion shafts are sleeved with rubber connection pipes movably connected with the extrusion shafts. The rubber connecting pipe comprises a sleeve with the same inner diameter as the extrusion shaft and an expansion pipe with the inner diameter smaller than that of the extrusion shaft and the outer diameter equal to the inner diameter of the fixing hole in the steel plate of the internal fixator; and each positioning bone nail comprises a positioning shaft, a second screwing bolt arranged at one end of the positioning shaft, and a thin bone nail arranged at the other end of the positioning shaft. The guide punching device is used for conducting guide punching in combination with a steel plate, the inclination degree of punching is precisely limited, nuts of connected bone nails can be perfectly attached to fixing holes in the steel plate, and the fixing effect is better.

Description

Technical Field

[0001] This utility model relates to the field of medical auxiliary device technology, and in particular to a positioning device for an internal fixation device for hand fractures. Background Technology

[0002] Hand fractures are a common type of fracture, usually caused by trauma, accidents, or high-intensity exercise. To allow the fracture to heal and restore hand function, doctors typically use internal fixation to stabilize the fracture site. Current internal fixation methods for hand fractures mainly include pinning, screwing, and plate fixation. Plate fixation involves inserting a plate into the fracture site and securing it to the bone with screws. This method offers the advantage of good fixation and stability.

[0003] Plate fixation requires first considering the fracture condition and then drilling holes in the bone through the fixation holes in the plate. However, because the plate is thin, when drilling through the fixation holes, one can only rely on experience to judge the angle of the hole, which results in the bone screw nut not fitting properly with the fixation hole in the plate after the bone screw is finally connected. Utility Model Content

[0004] The purpose of this invention is to provide a positioning device for an internal fixation device for hand fractures, which is used to guide drilling in conjunction with a steel plate, precisely limiting the inclination of the drilling, so that the nut of the bone screw after connection will fit perfectly with the fixation hole on the steel plate, resulting in better fixation.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a positioning device for an internal fixation device for hand fractures, comprising a positioning plate that fits against the steel plate of the internal fixation device, and a plurality of guide holes that cooperate with the fixing holes on the steel plate of the internal fixation device are provided through the positioning plate, wherein a threaded connection hole is provided at the upper part of several guide holes, and the inner diameter of the threaded connection hole is larger than the inner diameter of the guide hole.

[0006] It also includes multiple threaded connectors that are threadedly connected to the threaded connection holes. One end of each threaded connector is provided with a first screwing pin, and the other end of each threaded connector is provided with a compression shaft. The compression shaft is fitted with a rubber connecting tube that is movably connected to it. The rubber connecting tube includes a sleeve with the same inner diameter as the compression shaft and an expansion tube with an inner diameter smaller than the compression shaft and an outer diameter the same as the inner diameter of the fixing hole on the inner fixator steel plate.

[0007] It also includes multiple positioning bone screws, each of which includes a positioning shaft with the same inner diameter as the guide hole, a second turning pin disposed at one end of the positioning shaft, and a thin bone screw disposed at the other end of the positioning shaft.

[0008] By employing the above technical solution, during internal fixation of the fracture, the positioning plate is first fitted and connected to the internal fixation plate. The threaded connector is then connected to the threaded hole. The expansion tube is inserted into the fixation hole on the internal fixation plate. Subsequently, the first locking pin is turned to rotate the threaded connector, causing the compression shaft to gradually compress and expand the expansion tube, ensuring its outer wall is tightly pressed against the inner wall of the fixation hole on the internal fixation plate, thus connecting the positioning plate to the internal fixation plate. When fixing the internal fixation plate, it is fitted to the bone at the fracture site, and positioning screws are used for fixation. A medical drill is used to connect the positioning screws. The second screw is turned to allow the thin bone screw to pass through the guide hole and connect to the bone. After two positioning bone screws are used for positioning and connection, a drilling machine is used to drill holes in the bone through the guide hole. After drilling, bone screws are used to connect to the holes in the bone through the guide hole. After fixing multiple bone screws, the positioning bone screws are removed. Drilling and connecting with bone screws are then performed through the guide hole here. Finally, the threaded connector is rotated in reverse to drive the compression shaft out of the expansion tube, allowing the expansion tube to be dislodged from the fixation hole on the internal fixation plate. Drilling and connecting with bone screws are then performed through the guide hole here. Finally, the positioning plate is removed, and the internal fixation of the fracture is completed.

[0009] A further feature of this invention is that the inner diameter of the sleeve and the inner diameter of the expansion tube are smoothly transitioned.

[0010] A further feature of this invention is that a limiting ring with an outer diameter larger than the inner diameter of the guide hole is provided on the outer periphery of the upper end of the positioning shaft.

[0011] A further feature of this invention is that the cross-sections of both the first and second rotating pins are hexagonal.

[0012] In summary, this utility model has the following beneficial effects:

[0013] Firstly, after the positioning plate of this utility model is connected to the internal fixation plate, the internal fixation plate can be positioned by the positioning bone screw, preventing the internal fixation plate from shifting during the operation and affecting the operation.

[0014] Secondly, when using a medical punch to make holes, punching through the guide hole can limit the direction of the hole and precisely limit the angle of the hole, so that the nut of the bone screw after connection can perfectly fit with the fixing hole on the steel plate.

[0015] Thirdly, this utility model uses a squeezing shaft to squeeze and expand the expansion tube, thereby tightly connecting the expansion tube to the fixing hole on the internal fixation plate. This ultimately connects the positioning plate to the internal fixation plate. Furthermore, by twisting the threaded connector in the opposite direction, the squeezing shaft can be pulled out of the expansion tube, making the expansion tube loose and allowing it to be easily pulled out of the fixing hole on the internal fixation plate. This makes it easy to remove the positioning plate and convenient to use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the overall structure of the positioning plate;

[0018] Figure 3 Used to demonstrate the connection between the extrusion shaft and the rubber connecting tube;

[0019] Figure 4 This is a schematic diagram of the overall structural domain of the positioning bone screw.

[0020] In the diagram: 1. Positioning plate; 11. Guide hole; 12. Threaded connection hole; 2. Threaded connector; 21. First turning pin; 22. Extrusion shaft; 3. Rubber connecting tube; 31. Sleeve; 32. Expansion tube; 4. Positioning bone nail; 41. Positioning shaft; 42. Second turning pin; 43. Fine bone nail; 44. Limiting ring. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Example, refer to Figure 1-4 A positioning device for an internal fixation device for hand fractures includes a positioning plate 1 that fits against the steel plate of the internal fixation device. Six guide holes 11 are provided through the positioning plate 1 to cooperate with the fixation holes on the steel plate of the internal fixation device. Threaded connection holes 12 are provided at the upper part of three of the guide holes 11. The inner diameter of the threaded connection holes 12 is larger than the inner diameter of the guide holes 11.

[0023] It also includes three threaded connectors 2 that are threadedly connected to the threaded connection holes 12. One end of each threaded connector 2 is provided with a first turning pin 21. The cross-section of each first turning pin 21 is hexagonal. The other end of each threaded connector 2 is provided with a compression shaft 22. The compression shaft 22 is covered with a rubber connecting tube 3 that is movably connected to it. The rubber connecting tube 3 includes a sleeve 31 with the same inner diameter as the compression shaft 22 and an expansion tube 32 with an inner diameter smaller than the compression shaft 22 and an outer diameter the same as the inner diameter of the fixing hole on the inner fixation plate. The inner diameter of the sleeve 31 and the inner diameter of the expansion tube 32 are smoothly transitioned.

[0024] It also includes two positioning bone nails 4. Each positioning bone nail 4 includes a positioning shaft 41 with the same inner diameter as the guide hole 11, a second turning pin 42 set at one end of the positioning shaft 41, and a thin bone nail 43 set at the other end of the positioning shaft 41. A limiting ring 44 with an outer diameter larger than the inner diameter of the guide hole 11 is provided on the outer periphery of the upper end of the positioning shaft 41. The cross-section of the second turning pin 42 is hexagonal.

[0025] Instructions for use: When performing internal fixation of a fracture, first, attach the positioning plate 1 to the internal fixation plate, connect the threaded connector 2 to the threaded connection hole 12, insert the expansion tube 32 into the fixation hole on the internal fixation plate, and then connect the first turning pin 21 to rotate the threaded connector 2, causing the compression shaft 22 to gradually compress into the expansion tube 32 and open it, so that the outer wall of the expansion tube 32 is tightly pressed against the inner wall of the fixation hole on the internal fixation plate, thus connecting the positioning plate 1 to the internal fixation plate; when fixing the internal fixation plate, attach the plate to the bone at the fracture site, use the positioning bone nail 4 for positioning and fixation, and use a medical electric drill to connect the second turning pin on the positioning bone nail 4. Pin 42 allows the thin bone screw 43 to pass through the guide hole 11 and connect to the bone. After positioning and connecting with two positioning bone screws 4, drill holes in the bone through the guide hole 11 in sequence. After drilling, connect the bone screws through the guide hole 11 to the holes in the bone. After fixing multiple bone screws, remove the positioning bone screws 4 and drill and connect them with bone screws through the guide hole 11. Finally, rotate the threaded connector 2 in reverse order to pull the compression shaft 22 out of the expansion tube 32, so that the expansion tube 32 can be dislodged from the fixation hole of the internal fixation plate. Drill and connect them with bone screws through the guide hole 11. Finally, remove the positioning plate 1 to complete the internal fixation of the fracture.

[0026] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A positioning device for a hand fracture internal fixator, comprising a positioning plate (1) which is fitted to an internal fixator steel plate, characterized in that: The positioning plate (1) is provided with a plurality of guide holes (11) that cooperate with the fixing holes on the inner fixing plate. Among them, a few guide holes (11) are provided with threaded connection holes (12) at the upper part. The inner diameter of the threaded connection hole (12) is larger than the inner diameter of the guide hole (11). It also includes multiple threaded connectors (2) that are threadedly connected to the threaded connection hole (12). One end of the threaded connector (2) is provided with a first screwing pin (21), and the other end of the threaded connector (2) is provided with a compression shaft (22). The compression shaft (22) is sleeved with a rubber connecting tube (3) that is movably connected to it. The rubber connecting tube (3) includes a sleeve (31) with the same inner diameter as the compression shaft (22) and an expansion tube (32) with an inner diameter smaller than the compression shaft (22) and an outer diameter the same as the inner diameter of the fixing hole on the inner fixation plate. It also includes multiple positioning bone screws (4), each positioning bone screw (4) including a positioning shaft (41) with the same inner diameter as the guide hole (11), a second turning pin (42) disposed at one end of the positioning shaft (41), and a thin bone screw (43) disposed at the other end of the positioning shaft (41).

2. The positioning device for an internal fixation device for hand fractures according to claim 1, characterized in that: The inner diameter of the sleeve (31) and the inner diameter of the expansion tube (32) are smoothly transitioned.

3. The positioning device for a hand bone fracture internal fixator according to claim 1, wherein: A limiting ring (44) with an outer diameter larger than the inner diameter of the guide hole (11) is provided on the outer periphery of the upper end of the positioning shaft (41).

4. The positioning device for a hand bone fracture internal fixator according to claim 1, wherein: The cross-sections of the first rotating pin (21) and the second rotating pin (42) are both hexagonal.

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