Kirschner wire capable of automatically resetting compression fracture

Abstract

The utility model relates to a Kirschner wire of automatic reset pressurization fracture, Kirschner wire of automatic reset pressurization fracture includes needle body and pressurizing nut, needle body includes the bone segment and pressurization section of head to tail connection, the bone segment includes the drill bit, the connecting thread, the light axle Jia of head to tail connection in proper order, the light axle Jia outer diameter is less than the connecting thread small diameter, the pressurization section includes the pressurization thread, the light axle B of head to tail connection, the pressurization thread is with the pressurization nut thread cooperation, the pressurization nut outer diameter is greater than the connecting thread big diameter, the utility model has the connecting thread and the pressurization thread, the connecting thread is used to with the distal end bone segment and connects, the pressurization thread is matched with the pressurization nut, can realize the automatic reset pressurization of fracture site, is favorable to the recovery of fracture site.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices, and in particular to a Kirschner wire that can automatically reduce and compress fractures. Background Technology

[0002] Kirschner wires are a common internal fixation material in orthopedic surgery, primarily used for fracture fixation. The general surgical procedure using Kirschner wires is as follows: 1) Reduction; with C-arm assisted X-ray fluoroscopy, the fracture site is fluoroscopically examined; the fracture site is adjusted to align the fracture ends; reduction clamps are used to maintain alignment; 2) Wire placement design; the insertion point and direction of the Kirschner wire are designed according to the fracture site and type; 3) Insertion; using a bone drill or manually, the Kirschner wire is inserted into the fracture site according to the designed insertion point and direction; with X-ray assistance, the insertion direction of the Kirschner wire is adjusted; the Kirschner wire passes through the fracture end face; 4) Fixation; the tail of the Kirschner wire is shortened and embedded in the subcutaneous tissue; the reduction clamps are released. However, existing Kirschner wires at most have a concentrated external thread at one end to increase the connection strength with the bone; once the reduction clamps are released, the broken bone may shift due to the elasticity of the Kirschner wire itself, which is detrimental to fracture recovery. Utility Model Content

[0003] The purpose of this invention is to solve the above problems and provide a Kirschner wire that can automatically reduce and compress fractures.

[0004] The technical solution of this utility model is as follows: A Kirschner wire for automatically reducing and compressing fractures includes a wire body and a compression nut; the wire body includes a connecting bone segment and a compression segment connected end to end; the connecting bone segment corresponds to the width of the bone at the fracture site and is used to connect the bones at the fracture site; the compression segment is used for reducing and compressing the bones at the fracture site; the connecting bone segment includes a drill bit, a connecting thread, and a shaft axle connected end to end; the drill bit is used to drill a hole in the bone at the fracture site, and drills into the drilled hole with the connecting thread and shaft axle; the connecting thread also participates in drilling the bone and guides the bone fragments to the shaft axle; the outer diameter of the shaft axle is less than or equal to the small diameter of the connecting thread, so that a gap is created between the shaft axle and the hole; this gap can accommodate the bone fragments drilled by the drill bit, and allows the drill bit to continue drilling in the designed direction after the fracture end face. The bone is divided into two separate segments, A and B, by the fracture end face. The drill bit enters segment A, exits through the fracture end face, and continues drilling into segment B. After drilling a certain depth into segment B, the connecting thread establishes a stable connection with segment B, stopping the rotation of the drill bit. The pressure section includes a pressure thread and a shaft B connected end-to-end. The pressure thread engages with the pressure nut thread. The outer diameter of the pressure nut is greater than the major diameter of the connecting thread. The pressure nut is rotated forward, causing it to move forward relative to the drill bit. The end of the pressure nut can abut against segment A at the fracture site, causing segment A to abut against segment B. During the abutment of segments A and B, segments A and B are reduced using the fracture end face. Once segments A and B are reduced, the pressure nut can no longer rotate forward; the reduction and pressure application at the fracture site are complete.

[0005] Preferably, the outer diameter of the optical axis B is less than the minor diameter of the pressure thread; the pressure nut can be inserted from the tail end of the optical axis B.

[0006] Preferably, the drill bit is a conical drill bit, which is advantageous for drilling holes in bones.

[0007] Furthermore, the outer wall of the drill bit is provided with a tapered, threaded bone chip guide groove; the bone chip guide groove increases the drill bit's cutting ability on the bone on the one hand, and guides the bone chips on the other hand, so that the bone chips can be discharged smoothly.

[0008] Furthermore, the bone fragment guide groove is connected to the threaded groove of the connecting thread; the discharged bone fragments reach the position of the optical axis armor by means of the threaded groove of the connecting thread.

[0009] Preferably, the length of the pressure nut is less than the length of the pressure thread; this increases the axial travel of the pressure nut when applying pressure to the fracture site.

[0010] Preferably, the pressure nut is cylindrical in shape; the center of the pressure nut has an internal thread that mates with the pressure thread; sharp edges on the pressure nut are minimized to reduce damage to subcutaneous tissue.

[0011] Furthermore, the outer surface of the pressure nut is covered with an anti-slip coating to increase the friction of the outer surface of the pressure nut; this anti-slip coating is a biomimetic super-slip coating.

[0012] Furthermore, the outer edge of the pressure nut is rounded to reduce damage to subcutaneous tissue.

[0013] Preferably, the tooth profile of the connecting thread is not smaller than that of the pressure thread. A larger tooth profile can ensure a stable connection between the connecting thread and the bone and improve drilling efficiency. However, the pressure thread needs to ensure the axial displacement accuracy of the pressure nut, so the pressure thread is more inclined to a smaller tooth profile. The pressure nut ensures the pressure applied to the bone by using the number of smaller teeth.

[0014] Preferably, the outer diameter of optical axis A is greater than or equal to the outer diameter of optical axis B; optical axis A needs to have sufficient structural strength to ensure the connection between bone segment A and bone segment B at the fracture site; optical axis B only needs to ensure the transmission of sufficient torque and is easy to shorten after surgery.

[0015] The beneficial effects of this utility model are as follows: The Kirschner wire of this utility model, which can automatically reduce and compress fractures, has the following advantages: (1) This utility model has a connecting thread and a pressurizing thread; the connecting thread is used to connect with the distal bone segment; the pressurizing thread cooperates with the pressurizing nut to realize automatic reduction and pressurization of the fracture site, which is beneficial to the recovery of the fracture site; (2) The bone chip guide groove of this utility model increases the cutting ability of the drill bit on the bone on the one hand, and guides the bone chips on the other hand, so that the bone chips can be discharged smoothly. Attached Figure Description

[0016] Figure 1 This is a three-dimensional view of a Kirschner wire for automatically reducing and compressing fractures according to this utility model; Figure 2 yes Figure 1 A half-section view; Figure 3 This is a schematic diagram of the operation of a Kirschner wire for automatically reducing and compressing fractures according to this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the operation of a Kirschner wire for automatically reducing and compressing fractures according to this utility model. Figure 2 ; Figure 5 This is a schematic diagram of the operation of a Kirschner wire for automatically reducing and compressing fractures according to this utility model. Figure 3 ; Figure 6 This is a three-dimensional representation of a Kirschner wire for automatically reducing and compressing fractures according to Embodiment 3 of this invention. Figure 1 ; Figure 7This is a schematic diagram of the operation of a Kirschner wire for automatically reducing and compressing fractures according to Embodiment 3 of this utility model. Figure 1 ; Figure 8 This is a schematic diagram of the operation of a Kirschner wire for automatically reducing and compressing fractures according to Embodiment 3 of this utility model. Figure 2 ; Figure 9 This is a schematic diagram of the operation of a Kirschner wire for automatically reducing and compressing fractures according to Embodiment 3 of this utility model. Figure 3 ; In the diagram: 01. Bone segment A, 02. Bone segment B, 03. Fracture end face. 1. Needle body, 11. Bone segment, 111. Drill bit, 1111. Bone chip guide groove, 112. Connecting thread, 113. Optical axis A, 12. Pressure section, 121. Pressure thread, 122. Optical axis B, 1221. Chamfer, 2. Pressure nut, 21. Internal thread, 22. Anti-slip coating, 23. Rounded corner. Detailed Implementation

[0017] Example 1: See Figure 1-5A Kirschner wire for automatically reducing and compressing fractures includes a wire body 1 and a compression nut 2. The wire body 1 includes a connecting bone segment 11 and a compression segment 12 connected end to end. The connecting bone segment 11 corresponds to the width of the bone at the fracture site and is used to connect the bones at the fracture site. The compression segment 12 is used for reducing and compressing the bone at the fracture site. The connecting bone segment 11 includes a drill bit 111, a connecting thread 112, and a shaft armor 113 connected end to end. The drill bit 111 is used to drill a hole in the bone at the fracture site. The drill bit 111, along with its connecting thread 112 and optical axis armor 113, is inserted into the drilled hole. The connecting thread 112 also participates in drilling the bone, guiding bone fragments towards the optical axis armor 113. The outer diameter of the optical axis armor 113 is less than the minor diameter of the connecting thread 112, creating a gap between the optical axis armor 113 and the hole. This gap can accommodate bone fragments drilled by the drill bit 111, and also allows the drill bit 111 to continue drilling in the designed direction after reaching the fracture end face 03. The bone is divided by the fracture end face 03. Consider two separate bone segments, A01 and B02. Assume drill bit 111 enters bone segment A01, exits from fracture end face 03, and continues drilling into bone segment B02. After drill bit 111 penetrates bone segment B02 to a certain depth, connecting thread 112 establishes a stable connection with bone segment B02, stopping the rotation of needle body 1. The pressure section 12 includes a pressure thread 121 connected end-to-end and a light shaft 122. The pressure thread 121 is threadedly engaged with the pressure nut 2. The outer diameter of the pressure nut 2 is greater than that of the connecting thread 112. Connect the thread 112 with a large diameter; rotate the pressure nut 2 in the forward direction, causing the pressure nut 2 to move forward relative to the needle body 1; the end of the pressure nut 2 can abut against the bone segment A01 at the fracture site, causing bone segment A01 to abut against bone segment B02; during the abutment of bone segments A01 and B02, bone segments A01 and B02 are reduced with the help of the fracture end face 03; after bone segments A01 and B02 are reduced, the pressure nut 2 can no longer be rotated in the forward direction; the reduction and pressure of the fracture site are completed.

[0018] Compared with the prior art, the present invention has a connecting thread 112 and a pressure thread 121; the connecting thread 112 is used to connect with the distal bone segment; the pressure thread 121 cooperates with the pressure nut 2 to realize automatic reduction and pressure of the fracture site, which is beneficial to the recovery of the fracture site.

[0019] The outer diameter of the optical axis B122 is less than the minor diameter of the pressure thread 121; the pressure nut 2 can be inserted from the tail end of the optical axis B122.

[0020] Drill bit 111 is a conical drill bit 111, which is advantageous for drilling holes in bones.

[0021] The outer wall of the drill bit 111 is provided with a tapered threaded bone chip guide groove 1111; the bone chip guide groove 1111 increases the cutting ability of the drill bit 111 on the bone on the one hand, and guides the bone chips to be discharged smoothly.

[0022] The bone fragment guide groove 1111 is connected to the thread groove of the connecting thread 112; the discharged bone fragments reach the position of the optical axis armor 113 by means of the thread groove of the connecting thread 112.

[0023] The length of the pressure nut 2 is less than the length of the pressure thread 121; the axial movement of the pressure nut 2 when applying pressure to the fracture site is increased.

[0024] The pressure nut 2 is cylindrical in shape; the center of the pressure nut 2 has an internal thread 21 that mates with the pressure thread 121; the sharp edges on the pressure nut 2 are minimized to reduce damage to the subcutaneous tissue.

[0025] The outer surface of the pressure nut 2 is covered with an anti-slip coating 22 to improve the friction of the outer surface of the pressure nut 2; the anti-slip coating 22 is a biomimetic super-slip coating.

[0026] The outer edge of the pressure nut 2 is rounded 23 to reduce damage to subcutaneous tissue.

[0027] The tooth profile of the connecting thread 112 is not smaller than that of the pressure thread 121. The larger tooth profile can ensure the stable connection between the connecting thread 112 and the bone and the drilling efficiency. However, the pressure thread 121 needs to ensure the axial displacement accuracy of the pressure nut 2, so the pressure thread 121 is more inclined to a smaller tooth profile. The pressure nut 2 ensures the pressure applied to the bone by the number of small teeth.

[0028] The outer diameter of optical axis A113 is greater than or equal to the outer diameter of optical axis B122; optical axis A113 needs to have sufficient structural strength to ensure the connection between bone segment A01 and bone segment B02 at the fracture site; optical axis B122 only needs to ensure the transmission of sufficient torque and can be easily shortened after surgery.

[0029] See Figure 3-5 The surgical procedure in this embodiment includes the following steps: ①Preoperative preparation With the aid of a C-arm, X-ray fluoroscopy is used to examine the fracture site; the fracture site is adjusted to align the fracture ends; the insertion point and direction of the Kirschner wire are designed according to the fracture site and fracture type. ② Needle insertion The skin and flesh are cut open with a scalpel to expose the designed needle insertion point; in this embodiment, the needle insertion point is located on bone segment A01; the Kirschner wire of this embodiment is installed onto the bone drill; at this time, the head end of the pressure nut 2 is threadedly connected to the tail end of the pressure thread 121; the drill bit 111 is placed against the needle insertion point and drilled in the designed needle insertion direction; the bone fragments generated during drilling are temporarily stored in the optical axis armor 113 along with the bone fragment guide groove 1111; the drill bit 111 drills to a certain depth in bone segment B02, and the connecting thread 112 forms a stable connection with bone segment B02; the installation relationship between the Kirschner wire and the bone drill is released; ③ Reset and apply pressure Rotate the pressure nut 2 in the forward direction to move it forward along the axial direction of the needle body 1; the axially forward-moving pressure nut 2 abuts against bone segment A01, causing bone segment A01 to move closer to bone segment B02; after bone segment A01 and bone segment B02 abut against each other, as the pressure nut 2 moves forward axially, the fracture end face 03 of bone segment A01 and the fracture end face 03 of bone segment B02 are misaligned and moved until the fracture site is reduced and compressed; ④ Fix The end of the pressure segment 12 was shortened and embedded in the subcutaneous tissue.

[0030] Example 2: Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that the tooth profile of the connecting thread 112 is not smaller than that of the pressure thread 121. The larger tooth profile can ensure the stable connection between the connecting thread 112 and the bone and the drilling efficiency. However, the pressure thread 121 needs to ensure the axial displacement accuracy of the pressure nut 2, so the pressure thread 121 is more inclined to a smaller tooth profile. The pressure nut 2 ensures the pressure applied to the bone by the number of small teeth.

[0031] The outer diameter of optical axis A113 is greater than or equal to the outer diameter of optical axis B122; optical axis A113 needs to have sufficient structural strength to ensure the connection between bone segment A01 and bone segment B02 at the fracture site; optical axis B122 only needs to ensure the transmission of sufficient torque and can be easily shortened after surgery.

[0032] The end of the optical axis B122 is chamfered 1221 to facilitate installation on the bone drill.

[0033] Example 3: Example 3 is basically the same as Example 2, and the similarities will not be repeated. The differences are: the outer diameter of the optical axis 113 is equal to the minor diameter of the connecting thread 112; the bone chip guide groove 1111 is a variable pitch thread; the pitch of the bone chip guide groove 1111 at the front end of the drill bit 111 is greater than the pitch of the bone chip guide groove 1111 at the rear end of the drill bit 111. The drilling diameter of the proximal bone segment, i.e., bone segment A01, is greater than the outer diameter of the optical axis 113; the bone chip guide groove 1111 also serves to apply pressure to the fracture site.

[0034] See Figure 6-9The working process of this embodiment is basically the same as that of Embodiment 1; the similarities will not be repeated, and the differences are as follows: In step ②, after exposing the designed needle insertion point, first use the drill bit 111 to drill a hole in bone segment A01 along the designed direction; the diameter of the hole is greater than the outer diameter of the optical axis 113; the drill bit 111 passes through the hole and abuts against the fracture end face 03 of bone segment B02 for drilling; the drill bit 111 drills to a certain depth in bone segment B02, and the connecting thread 112 forms a stable connection with bone segment B02; then release the Kirschner wire from the bone drill.

Claims

1. A Kirschner wire capable of automatically reducing compression fractures, characterized in that, It includes a needle body and a pressure nut; the needle body includes a connecting section and a pressure section connected end to end; the connecting section includes a drill bit, a connecting thread, and a smooth shaft A connected end to end; the outer diameter of the smooth shaft A is less than or equal to the minor diameter of the connecting thread; the pressure section includes a pressure thread and a smooth shaft B connected end to end; the pressure thread is threadedly fitted with the pressure nut; the outer diameter of the pressure nut is greater than the major diameter of the connecting thread.

2. The Kirschner wire for automatically reducing and compressing fractures according to claim 1, characterized in that: The drill bit is a conical drill bit.

3. The Kirschner wire for automatically reducing and compressing fractures according to claim 2, characterized in that: The outer wall of the drill bit is provided with a tapered, threaded bone chip guide groove.

4. The Kirschner wire for automatically reducing and compressing fractures according to claim 3, characterized in that: The bone fragment guide groove is connected to the threaded groove of the connecting thread.

5. The Kirschner wire for automatically reducing compression fractures according to claim 1, characterized in that: The length of the pressure nut is less than the length of the pressure thread.

6. The Kirschner wire for automatically reducing compression fractures according to claim 1, characterized in that: The pressure nut is cylindrical in shape; the center of the pressure nut has an internal thread that mates with the pressure thread.

7. The Kirschner wire for automatically reducing compression fractures according to claim 6, characterized in that: The outer surface of the pressure nut is covered with an anti-slip coating.

8. The Kirschner wire for automatically reducing compression fractures according to claim 6, characterized in that: The outer edge of the pressure nut is rounded.

9. The Kirschner wire for automatically reducing compression fractures according to claim 1, characterized in that: The tooth profile of the connecting thread is not smaller than that of the pressurized thread.

10. The Kirschner wire for automatically reducing compression fractures according to claim 1, characterized in that: The outer diameter of optical axis A is greater than or equal to the outer diameter of optical axis B.

Images